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Corporation
SP301/302 RS-232/RS-422 Line Drivers/Receivers
SIGNAL PROCESSING EXCELLENCE
s s s s s s
RS-232 and RS-422 on One Chip Multiple Drivers and Receivers Software-selectable Modes Loopback for Self-Testing Short-circuit Protected 24-pin Single-width DIP or SOIC Package
DESCRIPTION... The SP301 and SP302 are proprietary single-chip devices that contain both RS-232 and RS-422 protocol line drivers and receivers. Their configuration may be changed at any time by logic levels on two control lines. In any configuration, both the SP301 and SP302 fully meet the requirements of the EIA RS-232D and RS-422 data communication standards. A loopback test mode is provided.The SP301 and SP302 are available in 24-pin single width plastic, and 28-pin SOIC packages for commercial and industrial temperature range operation.
TOB1
TOB2
TOA1 TOA2
RIB1
RIB2
RIA1 RIA2
VDD VCC VEE GND SELECT
A B LOOP- BACK
SP302
TIB1
TIB2
TIA1
ROB1
ROB2
ROA1
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SIGNAL PROCESSING EXCELLENCE
SPECIFICATIONS
(TMIN TA TMAX and nominal supply voltages unless otherwise noted)
PARAMETER RS-232 DRIVER TTL Input Level VIL VIH High Level Output Low Level Output Short Circuit Current Loopback Output Voltage Slew rate Transition Time Maximum Transmission Rate RS-232 RECEIVER Input Voltage Range Input High Threshold Input Low Threshold Input Impedance TTL Output Level VOL VOH Maximum Receiving Rate RS-422 DRIVER TTL Input Level V V High Level Output Low Level Output Differential Output
IL IH
MIN.
TYP.
MAX.
UNITS
CONDITIONS
0 2.0 +5.0 -1.5
0.8 -5.0 30 30 3
V V V V mA V V/s s kbps
RL = 3k, VIN = 0.8V RL = 3k, VIN = 2.0V VOUT = 0V RL = 3k, VEE = -12.0V; Note 1 CL = 50pF, RL = 3k; TA= 25C VOUT from +3V to -3V or -3V to +3V
200 -15 +1.75 +0.75 3 2.4 200 +15 +2.5 +1.35 7 0.4
V V V k V V kbps
Note 6 Positive-going Negative-going VSS VIN V DD VCC = +4.75V, IOUT = +1.6mA VCC = +4.75V, IOUT = -0.5mA
0 2.0 2.75 2
0.8 6.0 1.0 6 100 500 400
Short Circuit Current Output Current Transition Time Maximum Transmission Rate 1,000 RS-422 RECEIVER Common Mode Range Differential Input Differential Input Threshold -0.2 Input Voltage Hysteresis 30 Input Resistance 3 TTL Output Level V V 2.4 Maximum Receiving Rate 1,000 Short Circuit Output Current POWER REQUIREMENTS V = +12V, 10% V = +5V; 10% V = -12V, 10% ENVIRONMENTAL Operating Temperature -CS, -CT 0 -MR -55 Storage Temperature -65
OL OH DD CC EE
V V V V V V mA A ns kbps V V V mV k V V kbps mA mA mA mA
I = -20mA I = +20mA R = 100 R = Note 2 -0.25V V 6V; power off R = 100, C = 15pF; Note 3
OH OL L L O L L
7 15 +0.2
Note 4 Note 4 and 6 T = 25C V = 0V; T = 25C -7V V +7V
A CM A CM
0.4 120 7 5 11 15 7 20
V = +4.75V, I V = +4.75V, I
CC CC
OUT OUT
= +1.6mA = -0.5mA
V
OUT
= 0V
Note 5 Note 5 Note 5
+70 +125 +150
C C C
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SIGNAL PROCESSING EXCELLENCE
Notes:
1. 2. 3. 4. 5.
6.
In Loop-back mode Only one output drive pin per package will be shorted at any time From 10% to 90% of steady-state This is an absolute maximum rating; normal operating levels are V < 5V Outputs unloaded; Inputs tied to GND; T = +25C; V = 0V; LB=0 Typical SP302 current drains under full load are: 18mA (+12V), 10mA (-12V) and 7mA (+5V) in RS-232 mode only; 5mA (+12V), 7mA (-12V) and 56mA (+5V) in RS-422 mode only; 12mA (+12V), 14mA (-12V) and 31mA (+5V) in RS-232 and RS-422 modes; RS-232 loads 3k, 2500pF, 20kHz; RS-422 outputs across 100, 500kHz. In Loopback mode, the external voltage input to the receiver must not exceed 10V, otherwise the loopback test may be adversely affected.
IN A IL
TYPICAL PERFORMANCE CURVES RS-232 Driver RS-232 Receiver
T IN
5V GND 10V GND -10V 20kHz
RIN
5V GND -5V
T OUT ROUT 5V GND
20kHz
RS-422 Driver
RS-422 Receiver
2V TIN GND TOUT 5V GND -5V
RIN
2V GND -2V
ROUT 5V GND
500kHz
500kHz
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SIGNAL PROCESSING EXCELLENCE
PIN ASSIGNMENTS
VDD (+12V) 1 RIA2 2 RIA1 3 TOA2 4 TOA1 5 SELECT A 6 SELECT B 7 TOB1 8 TOB2 9 RIB1 10 RIB2 11 GND 12
24 VCC (+5V) 23 N.C. 22 ROA 21 N.C. 20 TIA 19 LB 18 N.C. 17 TIB 16 N.C. 15 ROB 14 N.C. 13 VEE (-12V)
VDD (+12V) 1 RIA2 2 RIA1 3 TOA2 4 TOA1 5 SELECT A 6 SELECT B 7 TOB1 8 TOB2 9 RIB1 10 RIB2 11 GND 12
24 VCC (+5V) 23 ROA2 22 ROA1 21 TIA2 20 TIA1 19 LB 18 N.C. 17 TIB1 16 TIB2 15 ROB1 14 ROB2 13 VEE (-12V)
SP301CS/MR
SP302CS/MR
VDD (+12V) 1 RIA2 2 RIA1 3 N.C. 4 TOA2 5 TOA1 6 SELECT A 7 SELECT B 8 TOB1 9 TOB2 10 N.C. 11 RIB1 12 RIB2 13 GND 14
28 VCC (+5V) 27 N.C. 26 ROA 25 N.C. 24 N.C. 23 TIA 22 LB 21 N.C. 20 TIB 19 N.C. 18 N.C. 17 ROB 16 N.C. 15 VEE (-12V)
VDD (+12V) 1 RIA2 2 RIA1 3 N.C. 4 TOA2 5 TOA1 6 SELECT A 7 SELECT B 8 TOB1 9 TOB2 10 N.C. 11 RIB1 12 RIB2 13 GND 14
28 VCC (+5V) 27 ROA2 26 ROA1 25 N.C. 24 TIA2 23 TIA1 22 LB 21 N.C. 20 TIB1 19 TIB2 18 N.C. 17 ROB1 16 ROB2 15 VEE (-12V)
SP302CT
FEATURES... The SP301 and SP302 are proprietary singlechip devices that contain both RS-232 and RS422 protocol line drivers and receivers. They differ only in the total number of line drivers and receivers of each protocol that may be active at any given time. Their configuration may be changed at any time by logic levels on two control lines. In any configuration, both the SP301 and SP302 fully meet the requirements of the EIA RS-232D and RS-422 data communication standards. The RS-232 line driver circuits convert TTL logic level inputs into inverted RS-232 output signals. The RS-422 line drivers convert TTL logic levels into RS-422 differential output signals. The RS-422 line driver outputs feature high source and sink current capability. All line drivers are internally protected against short circuits on their outputs. The RS-232 receivers convert the EIA RS-232 input signals to inverted TTL output logic levels.
SP301CT
The RS-422 receivers convert the EIA RS-422 differential input signals into non-inverted TTL output logic levels. Receiver input filtering provides excellent high frequency noise immunity. Input pulses with widths less than 1s are completely ignored. The RS-232 receivers have the additional feature of voltage hysteresis, which helps eliminate spurious output transitions that might result from low amplitude noise voltages during slower-speed signal transitions. A loopback test mode is provided that puts the driver outputs to a high impedance tri-state level, and routes the driver outputs to their associated receiver inputs. In this configuration, the signal path is non-inverting from the TTL driver input to the receiver TTL output. This operating mode allows the controlling system to perform diagnostic self-test of the RS-232/RS422 driver/receiver circuitry at speeds up to 3,000 bits per second. The SP301 and SP302 are available in 24-pin single-width (0.300") plastic DIP and 28-pin
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SIGNAL PROCESSING EXCELLENCE
VDD VDD VCC VCC
3.3k
SP301/302
GND VEE VEE
3.3k 2N2222 Q3 Q4
a) b)
VDD VDD VCC VCC
3.3k
SP301/302
GND VDD VEE VCC VEE
circuitry. If the potential exists for momentary shorts to voltages greater than 20V, it is recommended that a 220 resistor be wired in series with each driver output. This will limit any damage from the higher short-circuit current from these higher voltage potentials. Voltage clamps such as back-to-back Zener diodes can be used to clamp the driver outputs to "safe" levels. Short circuit current to ground is internally limited, and can therefore be sustained infinitely. Under normal operating conditions, the drivers can typically source 7mA at 5V output, which exceeds the minimum RS-232 standards requirement. If an SP301/302 transmitter output occupies a data transmission line with other RS-232 devices which are not powered by the same power supplies, it is possible that a device that is not powered will have a low impedance path to ground at its driver output. The RS-232 standards require that with no power applied to the device, the impedance from a transmitter output to ground must be greater than 300. This can be easily achieved as shown in Figure 1a, where an external transistor is used as a switch to
VDD
SP301/302
3.3k 2N2222 Q3 Q4 GND VEE
Figure 1. Isolating SP301/302 From Ground; a) Single SP301/302; b) Multiple SP301/302
SOIC packages for operation over the commercial temperature range.
USING THE SP301/302 POWER SUPPLIES The SP301/SP302 require 12V and +5V for full RS-232 and RS-422 operation. The 12V supplies set up the RS-232 9V voltage swings, and the +5V is used for the internal logic that formats the communications mode and controls the loopback function. The supply voltages can be decreased to as low as 7V for VDD and V EE, and 4.0V for VCC. Under these supply conditions, derated performance can be expected. POWER SUPPLY SEQUENCING There are two requirements for power supply sequencing for the SP301/302. 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. GENERAL USAGE RS232 Operation The SP301 and SP302 are fully compliant RS-232 devices. Their outputs are fully protected against shorts to 20V with no external
VDD 3.3k GND 3.3k
VCC VEE
VCC VEE
SELECT A = 1
SP302 2N2222 Q3 Q4
TIB1
SELECT B = 0 LOOPBACK = 1 TOB1
TIB2
TOB2 TOA1 TOA2
TIA1
ROB1
RIB1
ROB2
RIB2 RIA1 RIA2
ROA1
Figure 2. Typical Circuit
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SIGNAL PROCESSING EXCELLENCE
isolate an SP301/302 from ground in the poweroff condition. With VDD turned on, the transistor switch is on, connecting ground (GND) for the device to the circuit ground. In a power-off condition, this transistor is switched off, thus isolating the unit from circuit ground, and thereby leaving the driver in a high impedance state. Multiple SP301/302s can be connected as shown in Figure 1b. RS-422 OPERATION The SP301 and SP302 are fully compliant RS-422 devices when operating in the RS-422 mode. Baud rate and drive capability have been balanced to provide as much versatility as possible. The SP301 and SP302 are both guaranteed for a 1Mbps data rate, supplying 2V minimum into a 100 load. Short circuit protection for the RS-422 operating mode is the same as in the RS-232 mode. The driver outputs can be shorted to ground for an infinite duration, with a maximum current of 100mA. The RS-422 receivers accept differential signals at a 1Mbps rate, and translate them to a noninverted TTL output. The receivers are specified with a 15V differential input voltage,
which means that to operate normally, the difference betweeen the voltages at the inputs cannot exceed 15V. The common mode voltage is specified as 7V. This identifies the midpoint of the range about which the differential input must lie so that the receiver can detect a change of state. Within this 7V range, the receivers will recognize a change in state with a 200mV differential threshold voltage. Since the RS-232 and RS-422 inputs are shared, all receiver inputs are protected to 30V to guard against inadvertently applying an RS-232 signal to an input that is configured for RS-422. Figure 2 shows a typical circuit for the SP301/302. In this case the SP302 is shown configured for one (1) duplex RS-422 and two (2) duplex RS-232 communication paths. CONFIGURING THE SP301/302 Figures 3, 5 and 6 show the various combinations of simultaneous RS-232 and RS-422 operation that can be achieved with the SP301. Similarly, Figures 4, 7 and 8 show the various combinations for the SP302. Each of these configurations are software selectable by logic level on the SELECT A and SELECT B control lines. Configuration can be changed "on-the-fly".
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SIGNAL PROCESSING EXCELLENCE
FIGURE 3: SP301 CONTROL LOGIC CONFIGURATION
SELECTION SELECT A: SELECT B: NON- LOOPBACK (LB = 1) LOGIC VALUE 0 0 LOGIC VALUE 0 1 RIA2 RIA1 TOA1 TOA2 LOGIC VALUE 1 0 RIA2 RIA1 TOA1 TOA2 LOGIC VALUE 1 1
RIA1 TOA1
ROA TIA
RIA1 TOA1
ROA TIA
ROA
ROA
TIA
TIA
RIB1 TOB1
ROB TIB
RIB2 RIB1 TOB1 TOB2
ROB
RIB1 TOB1
ROB TIB
RIB2 RIB1 TOB1 TOB2
ROB
TIB
TIB
LOOPBACK (LB=0) RIA1 ROA RIA1 ROA
RIA2 RIA1 TOA*1 TOA*2
ROA
RIA2 RIA1 TOA*1 TOA*2
ROA
TOA*1
TIA
TOA*1
TIA
TIA
TIA
RIB1
ROB
RIB2 RIB1 TOB*1 TOB*2
ROB
RIB1
ROB
RIB2 RIB1 TOB*1 TOB*2
ROB
TOB*1
TIB
TIB
TOB*1
TIB
TIB
RS-232 DRIVER * Tri-state Output
RS-232 RECEIVER
RS-422 RECEIVER
RS-422 DRIVER
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SIGNAL PROCESSING EXCELLENCE
FIGURE 4: SP302 CONTROL LOGIC CONFIGURATION
SELECTION SELECT A: SELECT B: NON- LOOPBACK (LB = 1) RIA2 RIA1 TOA1 TOA2 RIB2 RIB1 TOB1 TOB2 LOGIC VALUE 0 0 ROA2 ROA1 TIA1 TIA2 ROB2 ROB1 TIB1 TIB2 RIA2 RIA1 TOA1 TOA2 LOGIC VALUE 0 1 ROA2 ROA1 TIA1 TIA2 RIA2 RIA1 TOA1 TOA2 ROA1 RIA2 RIA1 TOA1 TOA2 ROA1 LOGIC VALUE 1 0 LOGIC VALUE 1 1
TIA1
TIA1
RIB2 RIB1 TOB1 TOB2
RIB2 ROB1 RIB1 TOB1 TOB2
ROB2 ROB1 TIB1 TIB2
RIB2 RIB1 TOB1 TOB2
ROB1
TIB1
TIB1
LOOPBACK (LB=0)
RIA2 RIA1 TOA*1 TOA*2 RIB2 RIB1 TOB1 TOB2
ROA2 ROA1
RIA2 RIA1
ROA2
RIA2 ROA1 RIA1 TIA1 TIA2 RIB2 ROB1 RIB1 TOB1 TOB2 TOA*1 TOA*2
ROA1
RIA2 RIA1
ROA1
TIA1 TOA*1 TIA2 TOA*2 ROB2 ROB1 TIB1 TIB2
TOA*1 TIA1 TOA* 2
TIA1
RIB2 RIB1 TOB*1 TOB*2
ROB2 ROB1 TIB1 TIB2
RIB2 RIB1 TOB*1 TOB*2
ROB1
TIB1
TIB1
RS-232 DRIVER * Tri-state Output
RS-232 RECEIVER
RS-422 RECEIVER
RS-422 DRIVER
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SIGNAL PROCESSING EXCELLENCE
FIGURE 5: SP301 CONFIGURATIONS
Two-Channel Full Duplex RS-232 Two independent channels of RS-232 line driver and two channels of RS-232 receiver.
One-Channel Full Duplex RS-232 & One-Channel Full Duplex RS-422 A single RS-232 line driver and receiver, and a single RS-422 line driver and receiver.
TIA
TOA1
TIA
TOA1
TIB RS-232 LINE DRIVERS RS-232 RECEIVERS ROA
TOB1
ROA RS-232 LINE DRIVER & RECEIVER RS-422 LINE DRIVER & RECEIVER
RIA1
RIA1
TIB
ROB RIB1
TOB1 TOB2 RIB1
ROB
SELECT A = 0 SELECT B = 0 LB = 1
RIB2
SELECT A = 0 SELECT B = 1 LB = 1
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SIGNAL PROCESSING EXCELLENCE
FIGURE 6: SP301 CONFIGURATIONS
One-Channel Full Duplex RS-232 & One-Channel Full Duplex RS-422 Opposite Drivers A single RS-232 line driver and receiver, and a single RS-422 line driver and receiver. At first glance, this is the same configuration as that in Figure 5. Note however that functions are activated on the opposite channels as that of those in Figure 1b.
Two-Channel Full Duplex RS-422 Two RS-422 line drivers and two RS-422 receivers.
TIA
TOA1 TOA2 RIA1
TIA
TOA1 TOA2 TOB1 TOB2
ROA RIA2 RS-422 LINE DRIVER & RECEIVER RS-232 LINE DRIVER & RECEIVER TIB TOB1
TIB RS-422 LINE DRIVERS RS-422 RECEIVERS
RIA1 ROA RIA2
ROB
RIB1
RIB1 ROB RIB2
SELECT A = 1 SELECT B = 0 LB = 1
SELECT A = 1 SELECT B = 1 LB = 1
60
Corporation
SIGNAL PROCESSING EXCELLENCE
FIGURE 7: SP302 CONFIGURATIONS
Four-Channel Duplex RS-232 Four independent channels of RS-232 line driver and four channels of RS-232 receiver.
Two-Channel Duplex RS-232 & One-Channel Duplex RS-422 Two RS-232 line drivers and receivers, and a single RS-422 line driver and receiver.
TIA1
TOA1
TIA1
TOA1
TIA2
TOA2
TIA2
TOA2
TIB1
TOB1
RS-232 LINE DRIVERS RS-232 RECEIVERS
RIA1
TIB2
TOB2
ROA1 RIA2
RS-232 LINE DRIVERS RS-232 RECEIVERS ROA1 RIA2 ROA2 RIB1 ROB1 RIB2 ROB2 SELECT A = 0 SELECT B = 0 LB = 1 RIA1
ROA2 TIB1 RS-422 LINE DRIVER RS-422 RECEIVER ROB1 RIB1 RIB2 TOB1 TOB2
SELECT A = 0 SELECT B = 1 LB = 1
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SIGNAL PROCESSING EXCELLENCE
FIGURE 8: SP302 CONFIGURATIONS
Two-Channel Duplex RS-232 & One-Channel Duplex RS-422 Opposite Drivers Two RS-232 line drivers and receivers, and a single RS-422 line driver and receiver. At first glance, this is the same configuration in Figure 7. Note however that functions are activated on the opposite channels.
Two-Channel Duplex RS-422 Two RS-422 line drivers and two RS-422 receivers.
TIB1
TOB1
TIA1
TOA1 TOA2 TOB1 TOB2
TIB2
TOB2
TIB1
RS-232 LINE DRIVERS RS-232 RECEIVER ROB1 RIB1
RS-422 LINE DRIVERS RS-422 RECEIVERS ROA1 RIA1 RIA2 RIB1 ROB1 RIB2
ROB2
RIB2
TIA1
TOA1 TOA2
SELECT A = 1 SELECT B = 1 LB = 1
RS-422 LINE DRIVER RS-422 RECEIVER ROA1 RIA1 RIA2
SELECT A = 1 SELECT B = 0 LB = 1
62
Corporation
SIGNAL PROCESSING EXCELLENCE
LOOPBACK Both the SP301 and SP302 have a function called loopback, which is essentially a chip self-test. However, by connecting system test loops with the inputs and outputs of the SP301/302, a system-level diagnostic can be run on power-up or on command. The
test loops can be enabled and disabled allowing both system test and operation with the same components. A maximum data rate for loopback of 3kbps is recommended.Loopbackisapin-programmablefunction, activated by a logic low on the LB pin (19). As
SP301 CONFIGURATIONS IN LOOPBACK MODE
Two -Channel Full Duplex RS-232
One-Channel Full Duplex RS-232 & One-Channel Full Duplex RS-422
TIA
TOA1
TIA
TOA1
10k 10k
TIB RS-232 LINE DRIVERS RS-232 RECEIVERS ROA
TOB1
VEE
RS-232 LINE DRIVER RS-232 RECEIVER
RIA1
ROA
RIA1
ROB
RIB1
VEE TIB
10k 10k
SELECT A = 0 SELECT B = 0 LB = 1
TOB2 TOB1
10k 10k
VEE
RS-422 LINE DRIVER RS-422 RECEIVER ROB RIB2 RIB1
SELECT A = 0 SELECT B = 1 LB = 0 (ACTIVE)
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SIGNAL PROCESSING EXCELLENCE
shown in these figures, the loopback function internally connects the driver outputs to the corresponding receiver inputs, and switches the output pin to a resistive divider of 10k nominal impedance from VEE to ground. Receiver outputs are left active for signal verification. During loopback, the receiver inputs are tied to
ground via a 5k pulldown resistor. To minimize loopback errors, the receiver inputs must be limited to 10V swings.
SP301 CONFIGURATIONS IN LOOPBACK MODE
One-Channel Full Duplex RS-232 & One-Channel Full Duplex RS-422 Opposite Drivers
Two-Channel Full Duplex RS-422
VEE TIA
10k 10k
VEE
10k 10k
TOA2 TOA1
10k 10k
TIB
TOB1 TOB2
10k 10k
VEE
RS-422 LINE DRIVER RS-422 RECEIVER RIB2 RIB1
10k
VEE
RS-422 LINE DRIVER RS-422 RECEIVER ROA RIA2 RIA1
ROB
VEE
10k
TIA
TOA1 TOA2
10k
TIB
TOB1
10k
RS-232 LINE DRIVER RS-232 RECEIVER ROB
10k
VEE
10k
RS-422 LINE DRIVER RS-422 RECEIVER RIA2 RIA1
VEE
RIB1
ROA
SELECT A = 1 SELECT B = 0 LB = 0 (ACTIVE)
SELECT A = 1 SELECT B = 1 LB = 0 (ACTIVE)
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Corporation
SIGNAL PROCESSING EXCELLENCE
SP302 CONFIGURATIONS IN LOOPBACK MODE
Four-Channel Duplex RS-232
Two-Channel Duplex RS-232 & One-Channel Duplex RS-422
TIA1
TOA1
10k
RS-232 LINE DRIVER RS-232 RECEIVER ROA1
10k
VEE
VEE
10k
10k
RIA1
TIB1
TOB2 TOB1
10k
TIA2
TOA2
10k
VEE RS-422 LINE DRIVER
10k
RS-232 LINE DRIVER RS-232 RECEIVER ROA2
10k
VEE
RS-422 RECEIVER ROB1
RIB1 RIB2
RIA2
TIA1 TOA1
10k
TIB1
TOB1
10k
RS-232 LINE DRIVER RS-232 RECEIVER ROB1
10k
VEE
RS-232 LINE DRIVER RS-232 RECEIVER ROA1
10k
VEE
RIA1
RIB1
TIA2 TOA2
10 k
TIB2
TOB2
10k
RS-232 LINE DRIVER RS-232 RECEIVER ROB2
10k
VEE
RS-232 LINE DRIVER RS-232 RECEIVER ROA2
10k
VEE
RIA2
RIB2
SELECT A = 0 SELECT B = 1
SELECT A = 0 SELECT B = 0 LB = 0 (ACTIVE)
LB = 0 (ACTIVE)
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SIGNAL PROCESSING EXCELLENCE
SP302 CONFIGURATIONS IN LOOPBACK MODE
Two-Channel Duplex RS-232 & One-Channel Duplex RS-422 Opposite Drivers
Two-Channel Duplex RS-422
TIB2
TOB2
10k
10k
VEE
10k
TOB2 TOB1
10k
TIB1
TOB1
10k
10k
VEE
TIB1
RS-232 LINE DRIVERS RS-232 RECEIVERS ROB2
10k
VEE
RS-422 LINE DRIVERS RS-422 RECEIVERS ROB1
10k
VEE
RIB1 RIB2
RIB2
ROB1
RIB1
10k
VEE
10k
TIA1
TOA2 TOA1
10k
VEE TIA1
10k 10k
TOA2 TOA1
10k
RS-422 LINE DRIVERS RS-422 RECEIVERS ROA1
10k
VEE
RIA1 RIA2
VEE RS-422 LINE DRIVER RS-422 RECEIVER ROA1
10k
RIA1 RIA2
SELECT A = 1 SELECT B = 1 LB = 0 (ACTIVE)
SELECT A = 1 SELECT B = 0 LB = 0 (ACTIVE)
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SIGNAL PROCESSING EXCELLENCE
ORDERING INFORMATION
Max # of Duplex Channels Model RS232 RS422 Temperature Package SP301CS .......... 2 ........................ 2 ............. 0C to +70C .......................... 24-pin single-width plastic DIP SP301CT .......... 2 ........................ 2 ............. 0C to +70C ........................................................ 28-pin SOIC SP301ES .......... 2 ........................ 2 ......... -40C to +85C .......................... 24-pin single-width plastic DIP SP301ET .......... 2 ........................ 2 ......... -40C to +85C ........................................................ 28-pin SOIC SP302CS .......... SP302CT .......... SP302ES .......... SP302ET .......... 4 ........................ 2 4 ........................ 2 4 ........................ 2 4 ........................ 2 ............. 0C to +70C .......................... 24-pin single-width plastic DIP ............. 0C to +70C ........................................................ 28-pin SOIC ......... -40C to +85C .......................... 24-pin single-width plastic DIP ......... -40C to +85C ........................................................ 28-pin SOIC
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