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SP303 RS232/AppleTalkTM Serial Transceiver
SIGNAL PROCESSING EXCELLENCE
s Single chip serial transceiver supports AppleTalkTM or RS-232 interface s Programmable Selection of Interface s 4 RS-232 Drivers and 4 RS-232 Receivers s Provides MacintoshTM type interface s 30V Receiver Input Levels s Surface Mount Packaging
DESCRIPTION... The SP303 is a single chip device that offers both RS-232 and AppleTalkTM interfaces. When configured for RS-232 mode the SP303 has 4 drivers and 4 receivers. When the part is programmed for AppleTalk mode, the SP303 supports Macintosh-type ports. All drivers and receivers can operate at data rates up to 1 Mbps. The differential driver used for transmitting data signals is equipped with a tri-state function. The SP303 is available in a 28-pin SOIC package for operation over the commercial temperature range.
TOUTB1 TOUTB2 TOUTA1 TOUTA2 VCC
RINA1 RINA2
RINB1 RINB2
+5V INPUT +12V INPUT -12V INPUT
GND VDD VEE SELECT A B T1 T2 T3 T4 SP303 R1 R2 R3 R4
TINB1 TINB2 TINA1 TINA2 TXEN
ROUTA1 ROUTA2 ROUTB1 ROUTB2
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SPECIFICATIONS
(TMIN T A T MAX and nominal supply voltages unless otherwise noted)
PARAMETER MIN. TYP. MAX. RS--232 DRIVER TTL Input Level VIL 0 0.8 VIH 2.0 High Level Output +5.0 Low Level Output -5.0 Short Circuit Current 30 Slew Rate 30 Transition Time 3 Maximum Transmission Rate 200 RS-232 RECEIVER Input Voltage Range -15 +15 Input High Threshold +1.75 +2.5 Input Low Threshold +0.75 +1.35 Input Impedance 3 7 TTL Output Level VOL 0.4 VOH 2.4 Maximum Receiving Rate 200 DIFFERENTIAL DRIVER TTL Input Level VIL 0 0.8 VIH 2.0 High Level Output +3.6 +6 Low Level Output -3.6 -6 Differential Output 3.6 (VEE+0.7V) (VDD-0.7V) Short Circuit Current 40 Output Current 500 Leakage Current 0.05 10 Transition Time 720 Maximum Transmission Rate 1000 DIFFERENTIAL RECEIVER Common Mode Range 7 Differential Input 15 Differential Input Threshold -0.2 +0.2 Input Voltage Hysteresis 30 Input Resistance 3 TTL Output Level VOL 0.4 VOH 2.4 Maximum Receiving Rate 1000 Short Circuit Output Current 120 SINGLE-ENDED RECEIVER Input Threshold -200 Input Voltage Hysteresis 30 Input Impedance 3 TTL Output Level VOL VOH 2.4 Maximum Transmission Rate 1000 POWER REQUIREMENTS VDD = +12V, 10% VCC = +5V, 10% VEE = -12V, 10%
UNIT
CONDITIONS Note 1
V V V V mA V/s s kbps V V V k V V kbps
RL = 3k, VIN = 0.8V RL = 3k, VIN = 2.0V VOUT = 0V CL = 50pF, RL = 3k; TA = 25C Note 2 Note 1 Positive-going Negative-going CL 2,500pF; VSS VIN VDD VCC =+4.75V, IOUT =+1.6mA VCC =+4.75V, IOUT =-0.5mA Note 3
V V V V V V mA A A ns kbps V V V mV k V V kbps mA
IOH = 8mA IOL = -8mA RL = 450 RL = -0.25V VO 6V; Power off TxEN=Vcc, 0TxDO6V, Note 4 RL =450, CL =50pF; Note 5 Note 3 Note 6 Note 6 TA=25C VCM =0V TA=25C -7VVCM+7V VCC =+4.75V, IOUT=+1.6mA VCC =+4.75V, IOUT=-0.5mA VOUT =0V Note 3 TA 25C VCM 0V; TA=25C VCC =+4.75; IOUT=+1.6mA VCC =+4.75; IOUT=-0.5mA
+200 7 0.4
mV mV k V V kbps mA mA mA
7 5 11
15 7 20
All Transmitter outputs RL= TA=25C
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SPECIFICATIONS
(TMIN TA TMAX and nominal supply voltages unless otherwise noted)
PARAMETER MIN. TYP. MAX. ENVIRONMENTAL AND MECHANICAL Operating Temperature 0 +70 Storage Temperature -65 +150 Package 28-pin SOIC Note: 1. 2. 3. 4. 5. 6.
UNIT C C
CONDITIONS
RS-232 Mode, SELA = SELB = GND. VOUT from +3V to -3V or -3V to +3V. MacintoshTM AppleTalkTM Mode, SELA = SELB = +5V. Leakage current specification applies to both TxDO- and TxDO+; TA=+25C only. From 10% to 90% of steady state. This is an absolute maximum rating. Normal operating levels are VIN 5V.
PINOUT
VDD RINA2 RINA1 N.C. TOUTA2 TOUTA1 SELECTA SELECTB TOUTB1 1 2 3 4 5 6 7 8 9 28 27 26 25 24 23 22 21 20 19 18 17 16 15 VCC ROUTA2 ROUTA1 N.C. TINA2 TINA1 TXEN N.C. TINB1 TINB2 N.C. ROUTB1 ROUTB2 VEE
SP303
TOUTB2 10 N.C. 11 RINB1 12 RINB2 13 GND 14
PIN ASSIGNMENTS - RS232 MODE Pin 1 -- VDD -- +12V Power Supply. Pin 2 -- RINA2 -- DSR; RS-232 input. Pin 3 -- RINA1 -- RXD; RS-232 input. Pin 4 -- N.C. -- No Connection. Pin 5 -- TOUTA2 -- RTS; RS-232 output. Pin 6 -- TOUTA1 -- TXD; RS-232 output. Pin 7 -- SEL A -- Select A; used with Select B (pin 8) to select operating mode. Logic "0" on both SEL A and SEL B selects RS-232 mode; logic "1" on both SEL A and SEL B selects AppleTalkTM mode.
Pin 8 -- SEL B -- Select B; used with Select A (pin 7) to select operating mode. Logic "0" on both SEL A and SEL B selects RS-232 mode; logic "1" on both SEL A and SEL B selects AppleTalkTM mode. Pin 9-- TOUTB1-- DTR; RS-232 output. Pin 10 -- TOUTB2 -- Rl; RS-232 output. Pin 11 -- N.C. -- No Connection. Pin 12-- RINB1-- CTS; RS-232 input. Pin 13 -- N.C. -- No Connection. Pin 14 -- GND -- Signal ground. Connected to logic and chasis ground. Pin 15 -- VEE -- -12V Power Supply. Pin 16 -- N.C. -- No Connection. Pin 17 -- ROUTB1 -- CTS; TTL Output to UART. Pin 18 -- N.C. -- No Connection. Pin 19 -- TOUTB2 -- Rl; TTL input from UART. Pin 20 -- TINB1 -- DTR; TTL input from UART. Pin 21 -- N.C. -- No Connection. Pin 22 -- TxEN -- Transmit Enable; Only functional in Mac Mode. Pin 23 -- TINA1 -- TXD; TTL input from UART. Pin 24 -- N.C. -- No Connection. Pin 25 -- N.C. -- No Connection.
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SIGNAL PROCESSING EXCELLENCE
Pin 26 -- ROUTA1 -- RXD; TTL output to UART. Pin 27 -- N.C. -- No Connection. Pin 28 -- VCC -- +5V Power Supply. PIN ASSIGNMENTS -- MACINTOSHTM APPLETALKTM MODE Pin 1 -- VDD -- +12V Power Supply. Pin 2 -- RINA2 -- Receive data; received at UART's RxD (non-inverted); VIH = 0.2V; VIL = -0.2V; RIN =3k minimum. Pin 3 -- RINA1 -- Receive data; received at UART's RxD (inverted); V IH = 0.2V; VIL = -0.2V; RIN =3k minimum. Pin 4 -- N.C. -- No Connection. Pin 5 -- TOUTA2 -- Transmit data; driven from UART's TxD (non-inverted); tri-stated when UART's RTS is not asserted; VOH = 3.6V min; VOL = -3.6V min; RL = 450. Pin 6 -- TOUTA1 -- Transmit data; driven from UART's TxD (inverted); tri-stated when RTS is not asserted; VOH = 3.6V min; VOL = -3.6V min RL = 450. Pin 7 -- SEL A -- Select A; used with Select B (pin 8) to select operating mode. Logic "0" on both SEL A and SEL B selects RS-232 mode; logic "1" on both SEL A and SEL B selects AppleTalkTM mode. Pin 8 -- SEL B -- Select B; used with Select A (pin 7) to select operating mode. Logic "0" on both SEL A and SEL B selects RS-232 mode; logic "1" on both SEL A and SEL B selects AppleTalkTM mode. Pin 9-- TOUTB1-- Handshake output; driven from UART's DTR (inverted) ;VOH = 3.6V min; VOL = -3.6V min; RL = 450. Pin 10 -- TOUTB2 -- Handshake output; driven from UART's DTR (non-inverted); VOH = 3.6V min; VOL = -3.6V min; RL = 450. Pin 11 -- N.C. -- No Connection. Pin 12-- RINB1-- Handshake input or external clock; received non-inverted at UART's CTS and TRxC; VIH = 0.2V; V IL = -0.2V; RIN =3k minimum. Pin 13 -- N.C. -- No Connection. Pin 14 -- GND -- Signal ground. Connected to
logic and chasis ground. Pin 15 -- VEE -- -12V Power Supply. Pin 16 -- N.C. -- No Connection. Pin 17 -- ROUTB1 -- Receive handshake output; connects to UART's CTS and TRxC. Pin 18 -- N.C. -- No Connection. Pin 19 -- TOUTB2 -- Not used in AppleTalkTM mode. Pin 20 -- TINB1 -- Transmit handshake input; connects to UART's DTR output. Pin 21 -- N.C. -- No Connection. Pin 22 -- TxEN -- Transmit data driver enable; connects to UART's RTS; transmit data driver is enabled when this pin is low. Pin 23 -- TINA1 -- Transmit data input; connects to UART's TxD output. Pin 24 -- N.C. -- No Connection. Pin 25 -- N.C. -- No Connection. Pin 26 -- ROUTA1 -- Receive data output: connects to UART's RxD input. Pin 27 -- N.C. -- No Connection. Pin 28 -- VCC -- +5V Power Supply. FEATURES... The SP303 is a single chip device that offers both RS-232 and AppleTalk interfaces. When configured for RS-232 mode, the SP303 provides 4 drivers and 4 receivers. When the part is programmed for AppleTalk mode, the SP303 supports Macintosh-type ports. The mode can be changed at any time by bringing both the SEL A and the SEL B pins high for Mac mode, or low for RS-232 mode. The RS-232 line driver circuits convert TTL- logic level inputs into inverted RS-232 output signals. The RS-232 receivers convert the EIA RS-232 input signals to inverted TTL output logic levels. The receivers have voltage hysteresis, which helps eliminate spurious output transitions that might result from low-amplitude noise voltages during slower-speed signal transitions. When the SP303 is programmed for Mac mode, the transmit data and receive data signals are
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SIGNAL PROCESSING EXCELLENCE
SUPPLY +5V +12V -12V
to offer more flexible interface capabilities without additional material costs. The SP303 is available in a 28-pin SOIC package for operation over the commercial temperature range.
TOUTA1 TOUTA2 TOUTB1 TOUTB2 RINA1 RINA2 RINB1 RINB2
28 1 15 VCC VDD VEE TINA1 TINA2 TINB1 TINB2 ROUTA1 ROUTA2 ROUTB1 ROUTB2 23 T1 T2 T3 T4 R1 R2 R3 R4 GND SELECT A B 7 8 6
24
5
20
9
19
10 3 2
26 SP303 27
APPLICATION EXAMPLE RS-232 MODE SERIAL INTERFACE Figure 3 shows the SP303CT used in a dual serial port application which allows both RS-232 and MacintoshTM AppleTalkTM Mode interfaces. With SEL A and SEL B low, the port can be configured for RS-232. In this mode, the SP303CT is set up for 4 drivers and 4 receivers. The transmitter enable pin (pin22) has no effect in this mode. The RFI filters shown are optional depending upon the FCC requirements of the system. The SP303CT has internal slew rate limiting, which keeps the RS-232 slew rate <30V/s. Since the
SUPPLY +5V +12V -12V
17 16
12 13
14
Figure 1. RS232 Operating Mode
28 1 15 VCC VDD VEE 7 SELECT A
8
SELECT B 5 T1 6 TOUTA2 TOUTA1
differential, while the handshake-out and handshake-in signals are single-ended. The SP303 does not have the extra GPI (General Purpose Input). All drivers and receivers can operate at data rates up to 1 Mbps. The differential driver used for transmitting data signals is equipped with a tri-state function. When the TxEN pin is brought low, the differential driver is enabled; when it is high, the driver outputs are tri-stated. The tri-state function does not affect any other driver in either mode of operation. One SP303 can significantly reduce the board space necessary for a similar discrete solution offering both RS-232 and AppleTalk interfaces. Due to the space savings, the SP303 can provide multi-mode interfacing to equipment such as printers or modems without sacrificing additional board space or cost. This allows the OEM
TINA1 TXEN
23 22
TINB1
20
9 T2 SP303 10 2 R1 3
TOUTB1 TOUTB2 RINA2 RINA1
ROUTA1
26
ROUTB1
17 14
12 R2 GND 13
RINB1
Figure 2. MacintoshTM AppleTalkTM Operating Mode
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SIGNAL PROCESSING EXCELLENCE
SP303CT is usually connected to the outside world, it is suggested that the user place transient voltage suppression devices on each of the I/O lines to ensure up to 25kV ESD protection. While the part is programmed for RS-232 mode, the drivers and receivers can operate up to 200kbps. The RS-232 receiver inputs are capable of receiving signals up to 30V. The MacintoshTM AppleTalkTM mode inputs and outputs are protected to guard against the situation where an RS-232 cable is connected to the port while it is configured for AppleTalkTM mode.
APPLICATION EXAMPLE MACINTOSHTM APPLETALKTM SERIAL INTERFACE Figure 4 shows the SP303CT programmed for MacintoshTM AppleTalkTM operating mode. In this mode the SP303CT offers one differential driver used for transmitting data, one differential receiver used for receiving data, one single- ended, non-inverting receiver used to receive a handshake signal, and one single-ended inverting driver used to transmit a handshake signal. The differential driver used for transmitting data can be put into tri-state mode by bringing the TxEN line high; a low on this pin will enable the driver output. This function only applies to
SUPPLY +5V +12V -12V 28 1 15 VCC VDD VEE
T1 T2 R4 R2
TXD RTS DCD DSR RXD CTS DTR
23 24 16 27 26 17 20 19
6 5
RFI FILTER
TXD RTS DCD DSR RXD CTS DTR 5 2 8 7 4 1 6 3
RFI FILTER 13 RFI FILTER 2 3 12 9 10 RFI FILTER RFI FILTER RFI FILTER RFI FILTER
SP303
R1 R3 T3 T4
14 GND SELECT A B 8 7
SUPPLY +5V +12V -12V 28 1 15 VCC VDD VEE
T1 T2 R4 R2
TXD RTS DCD DSR RXD CTS DTR
23 24 16 27 26 17 20 19
6
RFI FILTER
TXD RTS DCD DSR RXD CTS DTR 5 2 8 7 4 1 6 3
5 RFI FILTER 13 RFI FILTER 2 3 12 9 10 RFI FILTER RFI FILTER RFI FILTER RFI FILTER
SP303
R1 R3 T3 T4
14 GND SELECT A B 8 7
Figure 3. RS-232 Interface.
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SIGNAL PROCESSING EXCELLENCE
the transmit data driver in ApppleTalkTM mode. Both differential drivers have output signals on each pin that typically swing 6V. The peak to peak differential voltage swing is typically 12V. The second driver is used for transmitting the handshake output signal and can be used as either a differential driver or single ended. This particular application required a single-ended inverting signal for the handshake output signal. Some Macintosh equipment requires an extra single-ended inverting receiver which is called a general purpose input. The GPI receiver is normally connected to pin 7 on the external 8 pin connector. This receiver is not available on the SP303CT.
SUPPLY +5V +12V -12V 28 1 15 VCC VDDVEE SELECT A SELECT B 6 23 5 2 3 SP303 CTS 17 12 13 RFI FILTER
Since the SP303CT is usually connected to the outside world, it is suggested that the user place transient voltage suppression devices on each of the 1/0 lines to ensure up to 25kV ESD protection.
POWER SUPPLY SEQUENCING There are two requirements for power supply sequencing for the SP303. The first is that VDD is always greater than VCC. The second is that when the part is powered up, VDD must be applied 20ms before VCC.
7 8 RTS TXD
22 RFI FILTER RFI FILTER RFI FILTER RFI FILTER TXDA- TXDA+ RXDA+ RXDA- HSKiA 5 2 9 RFI FILTER HSKoA 4 1 3 No Connect 8 7 6
RXD
26
DTR
20 10 14 GND SUPPLY +5V +12V -12V 28 1 15 VCC VDDVEE SELECT A SELECT B 6 23 5 2 3 SP303
7 8 RTS TXD
22 RFI FILTER RFI FILTER RFI FILTER RFI FILTER TXDA- TXDA+ RXDA+ RXDA- HSKiA 5 2 9 RFI FILTER HSKoA 4 1 3 No Connect 8 12 13 RFI FILTER 7 6
RXD
26
CTS
17
DTR
20 10 14 GND
Figure 4. MacintoshTM AppleTalkTM Interface.
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SIGNAL PROCESSING EXCELLENCE
ORDERING INFORMATION
Model Temperature Range Package SP303CT ....................................................... 0C to +70C ........................................................ 28-pin SOIC SP303CT/TR ................................................. 0C to +70C .................................. 28-pin SOIC/Tape-on-reel
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