View SP236A_3058588.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

1 sp30a/234a/235a/236a/237a/238a/239a/ +5v powered multi-channel rs-232 drivers/receivers ? copyright 2000 sipex corporation sp241a/235b/236b/240a/240b/241a/241b n operates from single +5v power supply (+5v and +12v C sp239a) n meets all rs-232d and v.28 specifications n 9v output swing with +5v supply n improved driver output capacity for mouse applications n low power shutdown C 1 m a n wakeup feature in shutdown mode n 3Cstate ttl/cmos receiver outputs n 30v receiver input levels n low power cmos C 5ma operation n wide charge pump capacitor value range C 1-10 m f description the sp230a series are multiCchannel rs-232 line drivers/receivers that provide a variety of configurations to fit most communication needs, especially where 12v is not available. some models feature a shutdown mode to conserve power in battery-powered systems. some require no external components. all, except one model, feature a built-in charge pump voltage converter, allowing them to operate from a single +5v power supply. all drivers and receivers meet all eia rs-232d and ccitt v.28 requirements. the series is available in plastic and ceramic dip and soic packages. selection table no. of no. of power rs-232 rs-232 external low power ttl wake- no. of model supplies drivers rcvrs components shutdown 3Cstate up pins sp230a +5v 5 0 4 capacitors yes no no 20 sp234a +5v 4 0 4 capacitors no no no 16 sp235a +5v 5 5 none yes yes no 24 sp235b +5v 5 5 none yes yes yes 24 SP236A +5v 4 3 4 capacitors yes yes no 24 sp236b +5v 4 3 4 capacitors yes yes yes 24 sp237a +5v 5 3 4 capacitors no no no 24 sp238a +5v 4 4 4 capacitors no no no 24 sp239a +5v/+8.5 to +13.2v 3 5 2 capacitors no yes no 24 sp240a +5v 5 5 4 capacitors yes yes no 44 sp240b +5v 5 5 4 capacitors yes yes yes 44 sp241a +5v 4 5 4 capacitors yes yes no 28 sp241b +5v 4 5 4 capacitors yes yes yes 28 ? sp230a/234a/235a/236a/237a/238a/239a/241a sp235b/236b/240a/240b/241a/241b +5v powered multi-channel rs-232 drivers/receivers
sp30a/234a/235a/236a/237a/238a/239a/ +5v powered multi-channel rs-232 drivers/receivers ? copyright 2000 sipex corporation sp241a/235b/236b/240a/240b/241a/241b 2 absolute maximum ratings this is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operation sections of this specification is not implied. exposure to absolute maximum rating conditions for extended periods of time may affect reliability. v cc ............................................................................................................................... ................................ +6v v + ................................................................................................................... (vccC0.3v) to +13.2v v C ............................................................................................................................... .............................. 13.2v input voltages: t in ....................................................................................................................... C0.3 to (vcc +0.3v) r in ............................................................................................................................... ............................. 30v output voltages: t out ................................................................................................. (v+, +0.3v) to (vC, C0.3v) r out .............................................................................................................. C0.3v to (vcc +0.3v) short circuit duration: t out ............................................................................................................................... .......... continuous power dissipation: cerdip .............................................................................. 675mw (derate 9.5mw/ c above +70 c) plastic dip .......................................................................... 375mw (derate 7mw/ c above +70 c) small outline ...................................................................... 375mw (derate 7mw/ c above +70 c) specifications all units vcc=+5v 10%; except sp235a/b, vcc=+5v 5%; sp239a only, v+ = +8.5 to +13.2v; all specifications t min to t max unless otherwise noted. parameters min. typ. max. units conditions power requirements vcc power supply current 5 10 ma no load, t a = +25 c sp239a only 0.4 1.0 ma v+ power supply current sp239a only 8 15 ma no load, v + = 12v shutdown supply current 1 10 m at a = +25 c logic inputs input logic threshold low 0.8 volts t in ; en, sd high 2.0 volts t in ; en, sd logic pullup current 15 200 m at in = 0v rs-232 inputs rs-232 input voltage range -30 +30 volts rs-232 input threshold low 0.8 1.2 volts vcc = 5v, t a = +25 c high 1.7 2.4 volts vcc = 5v, t a = +25 c rs-232 input hysteresis 0.2 0.5 1.0 volts vcc = 5v rs-232 input resistance 3 5 7 kohms t a = +25 c, -15v v in +15v logic outputs output voltage low 0.4 volts i out = 3.2ma high 3.5 volts i out = 1.0ma output leakage current 0.05 10 m a en = v cc , 0v v out vcc rs-232 outputs output enable time 400 ns sp235a/b, SP236A/b, sp239a & sp241a/b output disable time 250 ns sp235a/b, SP236A/b, sp239a & sp241a/b propagation delay 1.5 m s rs232 to ttl instantaneous slew rate 30 v/ m sc l = 10pf, r l = 3C7k w ; t a = +25 c rs-232 outputs transition region slew rate 3 v/ m sc l = 2500pf, r l = 3k w ; measured from +3v to -3v or -3v to +3v output voltage swing 5 9 volts all transmitter outputs loaded with 3k w to ground output resistance 300 ohms v cc = 0v; v out = 2v rs-232 output short circuit current 10 ma infinite duration
3 sp30a/234a/235a/236a/237a/238a/239a/ +5v powered multi-channel rs-232 drivers/receivers ? copyright 2000 sipex corporation sp241a/235b/236b/240a/240b/241a/241b 0v 5v 0v 5v 0v 0v t in t in t out t out r l = 3k w , c l = 2,500pf no load transmitter propagation delay transmitter output waveforms receiver output waveform shutdown to v+, vC rise time in out 5v 0v 0v sd v + v C rise time r l = 3k w ; c l = 2,500pf all inputs = 20khz t in t out t in t out fall time r l = 3k w ; c l = 2,500pf
sp30a/234a/235a/236a/237a/238a/239a/ +5v powered multi-channel rs-232 drivers/receivers ? copyright 2000 sipex corporation sp241a/235b/236b/240a/240b/241a/241b 4 receiver propagation delay r in 5v 0v r out 5v 0v r in 5v 0v r out pinout 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 sp230a t out t in nc sd t out t in t in v- c - c + 4 5 5 4 3 2 2 t out t out t out t in t in gnd v c + v+ c - 3 1 cc 2 1 1 1 2 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 sp234a t out t out t in t in v- c - c + c - 3 4 2 2 1 t out t out t in t in gnd v c + v+ 1 2 cc 1 2 1 3 4 r in r out t in sd en t out r in r out t in t in r out r in 3 5 4 t out t out t out t out r in r out t in t in r out r in gnd v 4 3 cc 2 1 1 4 5 2 2 2 1 1 3 3 4 5 5 1 2 3 4 5 6 7 8 9 10 11 12 24 23 22 21 20 19 18 17 16 15 14 13 sp235b t out r in r out sd en t in t in r out r in v- c - c + t out t out t out r in r out t in t in gnd v c + v+ c - 4 3 cc 1 2 2 1 1 2 3 4 2 2 1 2 3 4 5 6 7 8 9 10 11 12 24 23 22 21 20 19 18 17 16 15 14 13 sp236b 1 1 1 2 3 3 r in r out t in sd en t out r in r out t in t in r out r in 3 5 4 t out t out t out t out r in r out t in t in r out r in gnd v 4 3 cc 2 1 1 4 5 2 2 2 1 1 3 3 4 5 5 1 2 3 4 5 6 7 8 9 10 11 12 24 23 22 21 20 19 18 17 16 15 14 13 sp235a t out r in r out sd en t in t in r out r in v- c - c + t out t out t out r in r out t in t in gnd v c + v+ c - 4 3 cc 1 2 2 1 1 2 3 4 2 2 1 2 3 4 5 6 7 8 9 10 11 12 24 23 22 21 20 19 18 17 16 15 14 13 SP236A 1 1 1 2 3 3 fall time rise time
5 sp30a/234a/235a/236a/237a/238a/239a/ +5v powered multi-channel rs-232 drivers/receivers ? copyright 2000 sipex corporation sp241a/235b/236b/240a/240b/241a/241b receiver output enable/disable times disable 5v 0v 5v 0v en in r out enable 5v 0v 5v 0v en in r out pinout t out r in r out t in t out t in t in r out r in v- c - c + t out t out r in r out t in r out r in gnd v c + v+ c - 3 2 cc 1 2 1 1 1 3 2 3 2 2 1 2 3 4 5 6 7 8 9 10 11 12 24 23 22 21 20 19 18 17 16 15 14 13 sp238a 2 1 1 4 4 4 3 4 t in t in r out r in t out t out r in r out t in no connection en t out r out r 1n gnd v v+ c+ c- v- r in r out r out r in 1 1 cc 1 2 4 2 5 5 3 1 2 3 4 5 6 7 8 9 10 11 12 24 23 22 21 20 19 18 17 16 15 14 13 sp239a 2 2 1 3 4 3 3 t out r in r out t in t out t in t in r out r in v- c - c + t out t out t out r in r out t in t in gnd v c + v+ c - 4 3 cc 1 2 2 1 1 2 3 4 2 2 1 2 3 4 5 6 7 8 9 10 11 12 24 23 22 21 20 19 18 17 16 15 14 13 sp237a 1 1 1 5 3 3 2 5 t out r in r out shutdown (sd) en r in r out t in t in r out r in v- c - c + t out t out t out r in r out t in t in r out r in gnd v c + v+ c - 1 1 cc 1 2 4 2 5 3 sp241b 2 2 3 4 3 1 2 3 4 5 6 7 8 9 10 11 12 13 14 28 27 26 25 24 23 22 21 20 19 18 17 16 15 1 1 1 2 2 5 3 4 4 t out r in r out shutdown (sd) en r in r out t in t in r out r in v- c - c + t out t out t out r in r out t in t in r out r in gnd v c + v+ c - 1 1 cc 1 2 4 2 5 3 sp241b 2 2 3 4 3 1 2 3 4 5 6 7 8 9 10 11 12 13 14 28 27 26 25 24 23 22 21 20 19 18 17 16 15 1 1 1 2 2 5 3 4 4 n.c. n.c. n.c. v c 2 c 2 + c 1 v+ c 1 + n.c. n.c. n.c. t 5 in r 3 out r 3 in t 4 out t 3 out t 1 out t 2 out n.c. r 2 in n.c. n.c. shutdown en t 5 out r 4 in r 4 out t 4 in t 3 in r 5 out r 5 in n.c. n.c. r 2 out t 2 in t 1 in r 1 out r 1 in gnd v cc n.c. n.c. n.c. sp240a/b 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23
sp30a/234a/235a/236a/237a/238a/239a/ +5v powered multi-channel rs-232 drivers/receivers ? copyright 2000 sipex corporation sp241a/235b/236b/240a/240b/241a/241b 6 features the multiCchannel rs-232 line drivers/receivers pro- vides a variety of configurations to fit most communi- cation needs, especially those applications where 12v is not available. the sp230a , sp235a/b , SP236A/b, sp240a/b , and sp241a/b feature a shutdown mode which reduces device power dissipa- tion to less than 5 m w. all feature low power cmos operation, which is particularly beneficial in battery- powered systems. the sp235a/b use no external components and are ideally suited where printed circuit board space is limited. all products in the series, except the sp239a , include two charge pump voltage converters which allow them to operate from a single +5v supply. t hese converters convert the +5v input power to the 10v needed to generate the rs-232 output levels. the sp239a is designed to operate from +5v and +12v supplies. an internal charge pump converter produces the necessary C12v supply. all drivers and receivers meet all eia rs-232d and ccitt v.28 specifications. the series are available for use over the commer- cial, industrial and military temperature ranges. they are packaged in plastic and ceramic dip, and soic packages. for product processed and screened to milCmC38510 and milCstdC883c requirements, please consult the factory. theory of operation the sp230a/bC241a/b series devices are made up of three basic circuit blocks C 1) transmitter, 2) receiver and 3) charge pump. each model within the series incorporates variations of these circuits to achieve the desired configuration and performance. driver/transmitter the drivers are inverting transmitters, which accept ttl or cmos inputs and output the rs-232 signals with an inverted sense relative to the input logic levels. typically the rs-232 output voltage swing is 9v. even under worst-case loading conditions of 3k w and 2500pf, the output is guaranteed to be 5v, which is consistent with the rs-232 standard specifications. the transmitter outputs are protected against infi- nite short-circuits to ground without degradation in reliability. the drivers of the sp230a, sp235a/b, SP236A/b, sp240a/b and sp241a/b can be tri-stated by using the shutdown function. in this power-off state, the output impedance will remain greater than 300 ohms, again satisfying the rs-232 specifications. should the input of the driver be left open, an internal 400k w pullCup resistor to v cc forces the input high, thus committing the output to a low state. the slew rate of the transmitter output is internally limited to a maximum of 30v/ m s in order to meet the table 1. eia standards definition 20kbps 100kbps 10mbps 10mbps 64kbps
7 sp30a/234a/235a/236a/237a/238a/239a/ +5v powered multi-channel rs-232 drivers/receivers ? copyright 2000 sipex corporation sp241a/235b/236b/240a/240b/241a/241b standards [eia rs-232Cd 2.1.7, paragraph (5)]. the transition of the loaded output from v ol to v oh clearly meets the monotonicity requirements of the standard [eia rs-232Cd 2.1.7, paragraphs (1) & (2)] . receivers the receivers convert rs-232 input signals to in- verted ttl signals. since the input is usually from a transmission line, where long cable lengths and sys- tem interference can degrade the signal, the inputs have a typical hysteresis margin of 500mv. this ensures that the receiver is virtually immune to noisy transmission lines. the input thresholds are 0.8v minimum and 2.4v maximum, again well within the 3v rs-232 re- quirements. the receiver inputs are also protected against voltages up to 30v. should an input be left unconnected, a 5k w pulldown resistor to ground will commit the output of the receiver to a high state. in actual system applications, it is quite possible for signals to be applied to the receiver inputs before power is applied to the receiver circuitry. this occurs, for example, when a pc user attempts to print, only to realize the printer wasnt turned on. in this case an rs-232 signal from the pc will appear on the receiver input at the printer. when the printer power is turned on, the receiver will operate normally. all series devices are fully protected. again, to facilitate use in real-world applications, the receiver outputs can be triCstated by bringing the enable (en) pin high, with the driver remaining full active. charge pump the charge pump section of the sp230a series allows the circuit to operate from a single +5v, 10% power s1 gnd v cc + v+ = 2v cc + v cc s2 s3 s4 c1 c3 internal oscillator figure 1. charge pump voltage doubler supply by generating the required operating voltages internal to the devices. the charge pump consists of two sections 1) a voltage doubler and 2) a voltage inverter. as shown in figure 1 , an internal oscillator triggers the charge accumulation and voltage inversion. the voltage doubler momentarily stores a charge on capacitor c 1 equal to v cc , reference to ground. during the next transition of the oscillator this charge is bootCstrapped to transfer charge to capacitor c 3 . the voltage across c 3 is now from v cc to v + . in the inverter section ( figure 2 ), the voltage across c 3 is transferred to c 2 forcing a range of 0v to v + across c 2 . bootCstrapping of c 2 will then transfer charge to c 4 to generate v - . the values of the capacitors are somewhat non-critical and can be varied, however the performance will be affected. as c 3 and c 4 are reduced, higher levels of ripple will appear. lower values of c 1 and c 2 will increase the 10.5 10.0 9.5 9.0 8.5 8.0 7.5 7.0 6.5 6.0 5.5 5.0 v- (abs.) 0 5 10 15 20 25 30 35 40 v- i (ma) out v =5.5v cc v =5v cc v =4.5v cc 10.5 10.0 9.5 9.0 8.5 8.0 7.5 7.0 6.5 6.0 5.5 5.0 v+ (abs.) 0 5 10 15 20 25 30 35 40 v+ i (ma) out v =5.5v cc v =5v cc v =4.5v cc charge pump output loading versus vcc; a) v + ; b) v C a) b)
sp30a/234a/235a/236a/237a/238a/239a/ +5v powered multi-channel rs-232 drivers/receivers ? copyright 2000 sipex corporation sp241a/235b/236b/240a/240b/241a/241b 8 enable input (en) the sp235a/b , SP236A/b , sp239a, sp240a/ b, and sp241a/b all feature an enable input (en), which allows the receiver outputs to be either triCstated or enabled. the enable input is active low; 0v applied to en will enable the receiver outputs. this can be especially useful when the receiver is tied directly to a micropro- cessor data bus. protection from shorts to > 15v the driver outputs are protected against shorts to ground, other driver outputs, and v + or v - . for protection against voltages exceeding 15v, two backCtoCback zener diodes connected to clamp the outputs to an acceptable voltage level are recommended. (refer to figure 3. ) improved drive capability for mouse applications each of the devices in this data sheet have improved drive capability for non-standard ap- plications. although the eia rs-232d stan- dards specify the maximum loading to be 3k w and 2500pf, the sp230a , sp234a , sp235a/b , SP236A/b , sp237a , sp238a , sp239, sp240a/ b, and sp241a/b can typically drive loads as low as 1k w and still maintain 5v outputs. this feature is especially useful when the serial port is intended to be used for a self-powered mouse. in this case the voltage necessary to operate the circuits in the mouse can be derived from the rs-232 driver output as long as the loading is 3 1k w (refer to figure 4 ). for applica- tions which even exceed this requirement, driv- ers can be connected in parallel, increasing the drive capability to 750 w , while maintaining the 5v v oh and v ol levels (refer to figure 5 ). sd en power up/down receiver outputs 0 0 1 1 0 1 0 1 up up down down enable tri?tate enable tri?tate figure 3. high voltage short circuit protection figure 2. charge pump voltage inverter t in 1 t in t out t out 2 1 2 15v zener 15v zener s1 from voltage doubler v+ + v- = -(v+) + s2 s3 s4 c2 c4 internal oscillator gnd gnd output impedance of v + and v - , which will degrade v oh and v ol . capacitor values can be as low as 1.0 m f. shutdown (sd) the sp230a , sp235a/b , SP236A/b , sp240a/b and sp241a/b all feature a control input which will disable the part and reduce v cc current typically to less than 5 m a, which is especially useful to designers of batteryCpow- ered systems. in the powerCoff mode the receiver and transmitter will both be tri-stated. v + will discharge to v cc , and v - will discharge to ground. for complete shutdown to occur and the 10 m a current drain to be realized, the following con- ditions must be met: ? +5.00v must be applied to the sd pin; ? enable must either 0v, +5.0v or not connected; ? the transmitter inputs must be either +5.0v or not connected; ? v cc must be +5v; ? receiver inputs must be >0v and <+5v please note that for proper operation, the sd input pin must never be left floating. table 2. wakeCup truth table
9 sp30a/234a/235a/236a/237a/238a/239a/ +5v powered multi-channel rs-232 drivers/receivers ? copyright 2000 sipex corporation sp241a/235b/236b/240a/240b/241a/241b figure 4. mouse application drive capability 10 9 8 7 6 5 4 3 2 1 0 v ol/ v oh (volts) 024681012 1820 i ol /i oh (ma) 16 14 22 v ol vs i ol v oh vs i oh figure 5. parallel drivers t in t out wake-up feature the sp235b , sp236b , sp240b and sp241b have a wake-up feature that keeps all receivers in an enabled state when the device is in the shutdown mode. table 2 defines the truth table for the wake-up function. timing for the wake-up function is shown in figure 6 . if the sp235b , sp236b , sp240b and sp241b are powered up in the shutdown state (sd driven high during v cc power up), the part must remain in a powered on state for a minimum of 3ms before the wake-up function can be used. after the 3ms wait time, there is a 2ms delay time before data is valid for both enable and disable +5v 0v +5v 0v r out sd power-up with sd high (charge pump section in shutdown state) +5v 0v +5v 0v r out sd power-up with sd low (charge pump section in active mode) t wait t enable t 0 (power up) t 0 (power up) +5v 0v +5v 0v r out sd exercising wake?p feature t 0 (power up) data valid t wait data valid data valid data valid data valid t enable t enable t enable specifications: (v cc =+5v?0%, t a =25?) parameter min. typ. max. t wait 2ms 3ms t enable 1ms 2ms figure 6. wakeCup and shutdown timing
sp30a/234a/235a/236a/237a/238a/239a/ +5v powered multi-channel rs-232 drivers/receivers ? copyright 2000 sipex corporation sp241a/235b/236b/240a/240b/241a/241b 10 of the charge pump. if the sp2xxb is powered up with sd low, then only the 2ms delay time will apply (refer to figure 6 ). under normal operation, both the wait time and delay time should be transparent to the user. with only the receivers activated, the device typically draws less than 5 m a (10 m a max) sup- ply current. in the case of a modem interfaced to a computer in power-down mode, the ri (ring indicator) signal from the modem would be used to wake up the computer, allowing it to accept the data transmission. after the ring indicator signal has propagated through the sp2xxb receiver, it can be used to trigger the power management circuitry of the computer to power up the microprocessor and bring the sd pin to the sp2xxb low, taking it out of shutdown. the receiver propagation de- lay is typically 1 m s. the enable time for v+ and v- is typically 2ms. after v+ and v- have settled to their final values, a signal can be sent back to the modem on the dtr (data terminal ready) pin signifying that the computer is ready to accept and transmit data. all receivers that are active during shutdown maintain 500mv (typ.) of hysteresis. varying capacitor values as stated earlier, the capacitor values are some- what non-critical. since they are an actual compo- nent of the charge pump circuitry, their value will affect its performance, which in turn affects the v oh and v ol levels. there is no upper limit for the value of any of the four capacitors; lower values will impact performance. c 1 and c 2 are respon- sible for the charge accumulation and can be reduced to 1 m f; this will increase the output im- pedance of v + and v C . reducing these capacitor values will limit the ability of the sp2xxa/b to maintain the dc voltages needed to generate the rs-232 output levels. capacitors c 3 and c 4 can also be reduced to 1 m f; doing so will increase the ripple on v + and vC. typically each driver will require 1 m f of capaci- tance as a minimum to operate within all specified parameters; if five drivers are active in the circuit, then c 3 and c 4 should be 5 m f. in order to operate at these minimum values, the supply voltage must be maintained at +5.0v 5%. also, the ambient operating temperature must be less than 60 c. the capacitor values must be chosen to suit the particular application. the designer must bal- ance board space, cost and performance to maxi- mize the design. the capacitors can be polarized or nonCpolarized, axial-leaded or surface-mount. as the size and value decrease, so does the cost; however, the value should be chosen to accom- modate worst-case load conditions. ibm modem port interconnections computer d r d r r d r d transmitted data (to be printed) ready to send clear to send data set ready signal ground 4 2 5 6 7 received data (to be printed) ready to send clear to send data set ready signal ground modem r d received data 3 received data r d data carrier detect 8 data carrier detect d r data terminal ready 20 data terminal ready r d ring indicator 22 ring indicator sp239a sp237a interface example C a modem on the ibm pc serial port the rs-232 standard defines 22 serial interface signals. these signals consist of ground lines, timing, data, control and test signals, plus a set of signals rarely used for a second data channel. many of these signal lines are not used in typical rs-232 applications; in fact, the ibm ? pc serial port is implemented using only nine pins. for example, consider the case of a pc using this nine pin port to communicate with a peripheral device such as a modem. we see the following activity on each of the rs-232 lines as the computer and modem are activated and commu- nicate with each other as well as the remote modem at the other end of the phone line. signal ground (gnd) the signal ground pin acts as a reference for all the other signals. this pin is simply maintained at a 0v level to serve as a level to which all other signals are referenced. both the pc and the modem will have this line connected to their respective internal ground lines.
11 sp30a/234a/235a/236a/237a/238a/239a/ +5v powered multi-channel rs-232 drivers/receivers ? copyright 2000 sipex corporation sp241a/235b/236b/240a/240b/241a/241b data terminal ready (dtr) this is the pin the computer uses to tell periph- eral devices that it is onCline and ready to communicate. data set ready (dsr) peripheral devices use this line to tell the com- puter that they are onCline and ready to commu- nicate. when the modem is turned on and has completed its selfCtest routine (assuming it does one), it will send a signal to the pc by asserting this line. request to send (rts) the computer activates this line to notify the peripheral device that it is ready to send data. in this example, the computer notifies the modem that it is ready to send data to be transmitted by the modem. clear to send (cts) this is the line on which the peripheral device tells the computer that it is ready to receive data from the computer. if the modem was not ready, i.e. it was performing a loopCback selfCtest, for example, it would not assert this line. once the modem was ready to receive data from the pc, it would assert this line. when it receives the cts signal from the modem, the pc knows that a data transmission path has been established between itself and the modem. transmitted data (td or tx) this is the pin on which the computer sends the actual data signal to be transmitted, i.e. a posi- tive voltage (+3v to +15v) to represent a logic 0, and a negative voltage (C3v to C15v) to represent a logic 1. the pc would send the data on this line to be transmitted by the modem. ring indicator (ri) this line is used by the peripheral device to tell the computer that a remote device wants to start communicating. the modem would activate the ri line to tell the computer that the remote modem was calling, i.e. the phone is ringing. data carrier detect (dcd) this line is used by the modem to tell the computer that it has completed a transmission path with the remote modem, and to expect to start receiving data at any time. received data (rd or rx) this is the pin on which the modem sends the computer the incoming data signal, i.e. a posi- tive voltage (+3v to +15v) to represent a logic 0, and a negative voltage (-3v to -15v) to represent a logic 1. interface example C a printer on the ibm pc serial port the rs-232 standard defines 22 serial interface signals. these signals consist of ground lines, timing, data, control and test signals, plus a set of signals rarely used for a second data channel. many of these signal lines are not used in typical rs-232 applications; in fact, the ibm ? pc serial port is implemented using only nine pins. for example, consider the case of a pc using this nine pin port to communicate with a peripheral device such as a printer. we see the following activity on each of the rs-232 lines as the com- puter and printer are activated and communicate. signal ground (gnd) the signal ground pin acts as a reference for all the other signals. this pin is simply maintained at a 0v level to serve as a level to which all other signals are referenced. both the pc and the printer will have this line connected to their respective internal ground lines. data terminal ready (dtr) this is the pin the computer uses to tell peripheral devices that it is onCline and ready to communi- computer d r d r r d r d transmitted data (to be printed) ready to send clear to send data set ready signal ground 4 2 5 6 7 received data (to be printed) ready to send clear to send data set ready signal ground printer sp231a/232a sp231a/232a ibm printer port interconnections
sp30a/234a/235a/236a/237a/238a/239a/ +5v powered multi-channel rs-232 drivers/receivers ? copyright 2000 sipex corporation sp241a/235b/236b/240a/240b/241a/241b 12 cate. once the computer is poweredCup and ready, it will send out a signal on the dtr to inform the printer that it is poweredCup and ready to go. the printer really doesnt care, since it will simply print data as it is received. accordingly, this pin is not needed at the printer. data set ready (dsr) peripheral devices use this line to tell the computer that they are onCline and ready to communicate. when the printer is turned on and has completed its selfCtest routine (assuming it does one), it will send a signal to the pc by asserting this line. request to send (rts) the computer activates this line to notify the peripheral device that it is ready to send data. in this example, the computer notifies the printer that it is ready to send data to be printed by the printer. clear to send (cts) this is the line on which the peripheral device tells the computer that it is ready to receive data from the computer. if the printer was not ready, i.e. it was out of paper, for example, it would not assert this line. once the printer was ready to receive data from the pc, it would assert this line. when it receives the cts signal from the printer, the pc knows that a data transmission path has been established between itself and the printer. transmitted data (td or tx) this is the pin on which the computer sends the actual data signal representing the actual informa- tion to be printed, i.e. a positive voltage (+3v to +15v) to represent a logic 0, and a negative voltage (-3v to -15v) to represent a logic 1. ring indicator (ri) this line is used by the peripheral device to tell the computer that a remote device wants to start com- municating. a modem would activate the ri line to tell the computer that a remote modem was calling, i.e. the phone is ringing. in the case of a printer, this line is unused. data carrier detect (dcd) this line is used by a peripheral device to tell the computer to expect to start receiving data at any time. since the printer would not be sending data to the pc in this case this line is not needed. received data (rd or rx) this is the pin on which the computer receives the incoming data signal, i.e. a positive voltage (+3v to +15v) to represent a logic 0, and a negative voltage (-3v to -15v) to represent a logic 1. again, in this instance, since the printer will not be sending the pc any data, this line is not needed.
13 sp30a/234a/235a/236a/237a/238a/239a/ +5v powered multi-channel rs-232 drivers/receivers ? copyright 2000 sipex corporation sp241a/235b/236b/240a/240b/241a/241b 235a 11 gnd t 4 16 1 4 4 t 3 15 2 33 t 2 74 22 t 1 83 t in 1 t out 1 400k w 400k w 400k w 400k w ttl/cmos inputs rs-232 outputs 12 v cc +5v input t in t in t in t out t out t out t 5 22 19 5 5 400k w t in t out r 2 65 r in r out 2 r 1 910 r in r out 1 2 1 5k w 5k w r 4 17 18 r in r out 4 r 3 23 24 r in r out 3 4 3 5k w 5k w r 5 14 13 r in r out 5 5 5k w ttl/cmos outputs rs-232 inputs sd 21 en 20 235b 230a 234a t 4 14 15 4 4 t 3 13 16 33 t 2 32 22 t 1 41 t in 1 t out 1 5 gnd 400k w 400k w 400k w 400k w ttl/cmos inputs rs-232 outputs 11 10 9 7 c + c - c + c - 2 2 1 1 12 6 v cc v+ + + + + 1?0? 16v 1?0? 16v 1?0? 6.3v +5v to +10v voltage doubler +10v to -10v voltage inverter +5v input 8 t in t in t in t out t out t out v- 1?0? 6.3v 11 gnd t 4 16 1 4 4 t 3 15 2 33 t 2 74 22 t 1 83 t in 1 t out 1 400k w 400k w 400k w 400k w ttl/cmos inputs rs-232 outputs 12 v cc +5v input t in t in t in t out t out t out t 5 22 19 5 5 400k w t in t out r 2 65 r in r out 2 r 1 910 r in r out 1 2 1 5k w 5k w r 4 17 18 r in r out 4 r 3 23 24 r in r out 3 4 3 5k w 5k w r 5 14 13 r in r out 5 5 5k w ttl/cmos outputs rs-232 inputs sd 21 en 20 typical circuits t 5 19 16 5 t out 5 t 4 15 20 4 t out 4 t 3 14 1 33 t 2 43 22 t 1 52 t in 11 6 18 17 sd nc gnd 400k w 400k w 400k w 400k w 400k w ttl/cmos inputs rs-232 outputs 12 11 10 8 c + c - c + c - 2 2 1 1 13 1?0? 6.3v 7 v cc v+ + + + + 1?0? 16v 1?0? 16v 1?0? 6.3v +5v to +10v voltage doubler +10v to -10v voltage inverter +5v input 9 t in t in t in t in t out t out t out v-
sp30a/234a/235a/236a/237a/238a/239a/ +5v powered multi-channel rs-232 drivers/receivers ? copyright 2000 sipex corporation sp241a/235b/236b/240a/240b/241a/241b 14 237a 238a 236a 236b typical circuits 8 14 13 12 10 c + c - c + c - 2 2 1 1 15 9 v cc v+ + + + + 1?0? 16v 1?0? 16v 1?0? 6.3v +5v to +10v voltage doubler +10v to -10v voltage inverter +5v input 11 v- t 4 19 24 4 4 t 3 18 2 33 t 2 7 1 22 t 1 6 3 t in 1 t out 1 400k w 400k w 400k w 400k w ttl/cmos inputs rs-232 outputs t in t in t in t out t out t out r 2 22 23 r in r out 2 r 1 54 r in r out 1 2 1 5k w 5k w r 3 17 16 r in r out 3 3 5k w 3 ttl/cmos outputs rs-232 inputs sd 21 en 20 gnd 1?0? 6.3v 8 14 13 12 10 c + c - c + c - 2 2 1 1 15 9 v cc v+ + + + + 1?0? 16v 1?0? 16v 1?0? 6.3v +5v to +10v voltage doubler +10v to -10v voltage inverter +5v input 11 v- t 4 19 24 4 4 t 3 18 2 33 t 2 7 1 22 t 1 6 3 t in 1 t out 1 400k w 400k w 400k w 400k w ttl/cmos inputs rs-232 outputs t in t in t in t out t out t out r 2 22 23 r in r out 2 r 1 54 r in r out 1 2 1 5k w 5k w r 3 17 16 r in r out 3 3 5k w 3 ttl/cmos outputs rs-232 inputs sd 21 en 20 gnd 1?0? 6.3v 8 14 13 12 10 c + c - c + c - 2 2 1 1 15 9 v cc v+ + + + + 1?0? 16v 1?0? 16v 1?0? 6.3v +5v to +10v voltage doubler +10v to -10v voltage inverter +5v input 11 v- t 4 19 24 4 4 t 3 18 2 33 t 2 7 1 22 t 1 6 3 t in 1 t out 1 400k w 400k w 400k w 400k w ttl/cmos inputs rs-232 outputs t in t in t in t out t out t out r 2 22 23 r in r out 2 r 1 54 r in r out 1 2 1 5k w 5k w r 3 17 16 r in r out 3 3 5k w ttl/cmos outputs rs-232 inputs gnd t 5 21 20 5 5 400k w t in t out 1?0? 6.3v 8 14 13 12 10 c + c - c + c - 2 2 1 1 15 9 v cc v+ + + + + 1?0? 16v 1?0? 16v 1?0? 6.3v +5v to +10v voltage doubler +10v to -10v voltage inverter +5v input 11 v- t 4 19 24 4 4 t 3 18 2 33 t 2 1 22 t 1 5 t in 1 t out 1 400k w 400k w 400k w 400k w ttl/cmos inputs rs-232 outputs t in t in t in t out t out t out r 2 22 3 r in r out 2 r 1 6 7 r in r out 1 2 1 5k w 5k w r 3 23 r in r out 3 3 5k w ttl/cmos outputs rs-232 inputs gnd 21 20 r 4 17 16 r in r out 4 4 5k w 4 1?0? 6.3v
15 sp30a/234a/235a/236a/237a/238a/239a/ +5v powered multi-channel rs-232 drivers/receivers ? copyright 2000 sipex corporation sp241a/235b/236b/240a/240b/241a/241b 3 gnd t 3 16 13 33 t 2 23 20 22 t 1 24 19 t in 1 t out 1 400k w 400k w 400k w ttl/cmos inputs rs-232 outputs 4 v cc +5v input t in t in t out t out r 2 22 21 r in r out 2 r 1 12 r in r out 1 2 1 5k w 5k w r 4 17 12 r in r out 4 r 3 11 18 r in r out 3 4 3 5k w 5k w r 5 10 9 r in r out 5 5 5k w ttl/cmos outputs rs-232 inputs nc* 15 en 14 7 6 c+ c- 8 v+ + + 1?0? 16v +12v to -12v voltage converter 5 v- 1?0? 16v 12v _ 10% + nc* = no connection 239a 241b 10 gnd t 3 20 1 33 t 2 63 22 t 1 72 t in 1 t out 1 400k w 400k w 400k w ttl/cmos inputs rs-232 outputs t in t in t out t out r 2 5 27 r in r out 2 r 1 8 4 r in r out 1 2 1 5k w 5k w r 4 26 18 r in r out 4 r 3 22 23 r in r out 3 4 3 5k w 5k w r 5 19 9 r in r out 5 5 5k w ttl/cmos outputs rs-232 inputs sd 25 en 24 t 4 21 28 44 400k w t in t out 16 15 14 12 c + c - c + c - 2 2 1 1 17 11 v cc v+ + + + + 1?0? 16v 1?0? 16v 1?0? 6.3v +5v to +10v voltage doubler +10v to -10v voltage inverter +5v input 13 v- 1?0? 6.3v 10 gnd t 3 20 1 33 t 2 63 22 t 1 72 t in 1 t out 1 400k w 400k w 400k w ttl/cmos inputs rs-232 outputs t in t in t out t out r 2 5 27 r in r out 2 r 1 8 4 r in r out 1 2 1 5k w 5k w r 4 26 18 r in r out 4 r 3 22 23 r in r out 3 4 3 5k w 5k w r 5 19 9 r in r out 5 5 5k w ttl/cmos outputs rs-232 inputs sd 25 en 24 t 4 21 28 44 400k w t in t out 16 15 14 12 c + c - c + c - 2 2 1 1 17 11 v cc v+ + + + + 1?0? 16v 1?0? 16v 1?0? 6.3v +5v to +10v voltage doubler +10v to -10v voltage inverter +5v input 13 v- 1?0? 6.3v 241a 240a/b 18 gnd t 3 37 6 3 3 t 2 8 2 2 t 1 7 t in 1 t out 1 400k 400k w 400k w ttl/cmos inputs rs-232 outputs t in t in t out t out 13 r in r out 2 r 1 16 10 r in r out 1 2 1 r 4 3 35 r in r out 4 r 3 39 40 r in r out 3 4 3 r 5 36 17 r in r out 5 5 ttl/cmos outputs rs-232 inputs sd 43 en 42 28 27 25 30 19 v cc v+ + + + + 10? 16v 4.7? 16v 4.7? 6.3v +5v to +10v voltage doubler +10v to -10v voltage inverter +5v input 26 v- 10? 6.3v sp240a/b 14 15 29 4 5k w t 5 2 41 t 4 5 400k w 400k w t in t in t out 38 4 5 t out 5 4 c + 1 c 1 c + 2 c 2 r 2 5k w 5k w 5k w 5k w typical circuits
sp30a/234a/235a/236a/237a/238a/239a/ +5v powered multi-channel rs-232 drivers/receivers ? copyright 2000 sipex corporation sp241a/235b/236b/240a/240b/241a/241b 16 ordering information model ....................................................................................... temperature range .................................................................... package sp230acp ..................................................................................... 0 c to +70 c ..................................................................... 20Cpin plastic dip sp230act ..................................................................................... 0 c to +70 c .............................................................................. 20Cpin soic sp230acx ..................................................................................... 0 c to +70 c ............................................................................................ dice sp230aep ................................................................................... C40 c to +85 c ................................................................... 20Cpin plastic dip sp230aet ................................................................................... C40 c to +85 c ............................................................................ 20Cpin soic sp234acp ..................................................................................... 0 c to +70 c ..................................................................... 16Cpin plastic dip sp234act ..................................................................................... 0 c to +70 c .............................................................................. 16Cpin soic sp234acx ..................................................................................... 0 c to +70 c ............................................................................................ dice sp234aep ................................................................................... C40 c to +85 c ................................................................... 16Cpin plastic dip sp234aet ................................................................................... C40 c to +85 c ............................................................................ 16Cpin soic sp235acp ..................................................................................... 0 c to +70 c ............................................. 24Cpin plastic doubleCwidth dip sp235aep ................................................................................... C40 c to +85 c ........................................... 24Cpin plastic doubleCwidth dip sp235bcp ..................................................................................... 0 c to +70 c ............................................. 24Cpin plastic doubleCwidth dip sp235bep ................................................................................... C40 c to +85 c ........................................... 24Cpin plastic doubleCwidth dip SP236Acs ..................................................................................... 0 c to +70 c ..................................................................... 24Cpin plastic dip SP236Act ..................................................................................... 0 c to +70 c .............................................................................. 24Cpin soic SP236Acx ..................................................................................... 0 c to +70 c ............................................................................................ dice SP236Aes ................................................................................... C40 c to +85 c ................................................................... 24Cpin plastic dip SP236Aet ................................................................................... C40 c to +85 c ............................................................................ 24Cpin soic sp236bcs ..................................................................................... 0 c to +70 c .................................................................... 24Cpin plastic dip sp236bct ..................................................................................... 0 c to +70 c .............................................................................. 24Cpin soic sp236bcx ..................................................................................... 0 c to +70 c ............................................................................................ dice sp236bes ................................................................................... C40 c to +85 c ................................................................... 24Cpin plastic dip sp236bet ................................................................................... C40 c to +85 c ............................................................................ 24Cpin soic sp237acs ..................................................................................... 0 c to +70 c ..................................................................... 24Cpin plastic dip sp237act ..................................................................................... 0 c to +70 c .............................................................................. 24Cpin soic sp237acx ..................................................................................... 0 c to +70 c ............................................................................................ dice sp237aes ................................................................................... C40 c to +85 c ................................................................... 24Cpin plastic dip sp237aet ................................................................................... C40 c to +85 c ............................................................................ 24Cpin soic sp238acs ..................................................................................... 0 c to +70 c ..................................................................... 24Cpin plastic dip sp238act ..................................................................................... 0 c to +70 c .............................................................................. 24Cpin soic sp238acx ..................................................................................... 0 c to +70 c ............................................................................................ dice sp238aes ................................................................................... C40 c to +85 c ................................................................... 24Cpin plastic dip sp238aet ................................................................................... C40 c to +85 c ............................................................................ 24Cpin soic sp239acs ..................................................................................... 0 c to +70 c ..................................................................... 24Cpin plastic dip sp239act ..................................................................................... 0 c to +70 c .............................................................................. 24Cpin soic sp239acx ..................................................................................... 0 c to +70 c ............................................................................................ dice sp239aes ................................................................................... C40 c to +85 c ................................................................... 24Cpin plastic dip sp239aet ................................................................................... C40 c to +85 c ............................................................................ 24Cpin soic sp240acf ..................................................................................... 0 c to +70 c ............................................................... 44Cpin quad flatpack sp240bcf ..................................................................................... 0 c to +70 c .............................................................. 44Cpin quad flatpack sp241act ..................................................................................... 0 c to +70 c .............................................................................. 28Cpin soic sp241aet ................................................................................... C40 c to +85 c ............................................................................ 28Cpin soic sp241bct ..................................................................................... 0 c to +70 c .............................................................................. 28Cpin soic sp241bet ................................................................................... C40 c to +85 c ............................................................................ 28Cpin soic some Cct and Cet packages available tapeConCreel; please consult the factory.
17 sp30a/234a/235a/236a/237a/238a/239a/ +5v powered multi-channel rs-232 drivers/receivers ? copyright 2000 sipex corporation sp241a/235b/236b/240a/240b/241a/241b corporation signal processing excellence sipex corporation reserves the right to make changes to any products described herein. sipex does not assume any liability aris ing out of the application or use of any product or circuit described hereing; neither does it convey any license under its patent rights nor the rights of others. sipex corporation headquarters and sales office 22 linnell circle billerica, ma 01821 tel: (978) 667-8700 fax: (978) 670-9001 e-mail: sales@sipex.com sales office 233 south hillview drive milpitas, ca 95035 tel: (408) 934-7500 fax: (408) 935-7600

▲Up To Search▲

Price & Availability of SP236A

	To Download SP236A Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .