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NTE7142 Integrated Circuit +5V-Powered, Multichannel RS-232 Driver/Receiver
Description: The NTE7142 is a multichannel RS-232 driver/receiver in a 16-Lead DIP type package intended for all EIA/TIA-232E and V.28/V.24 communications interfaces, particularly applications where 12V is not available. Features: D Operate From Single +5V Power Supply D Meet All EIA/TIA-232E and V.28 Specifications D Multiple Drivers and Receivers D 3-State Driver and Receiver Outputs Applications: D Portable Computers D Low-Power Modems D Interface Translation D Battery-Powered RS-232 Systems D Multidrop RS-232 Networks Absolute Maximum Ratings: (Note 1) Supply Voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to +6V Input Voltage, TIN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to (VCC-0.3V) Input Voltage, RIN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30V Output Voltage (Note 2), TOUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15V Output Voltage, ROUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to (VCC+0.3V) Driver/Receiver Output Short Circuited to GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Continuous Continuous Power Dissipation (TA = +70C), PD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 842mW Dreate Above +70C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10.53mW/C Operating Temperature Range, Topr . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 to +70C Storage Temperature Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -65 to +160C Lead Temperature (During Soldering, 10sec), TL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +300C Note 1. Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational section of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Note 2. Input voltage measured with TOUT in high-impedance state, VCC = 0V.
Electrical Characteristics:
Parameter RS-232 Transmitter Output Voltage Swing Input Logic Threshold Low Input Logic Threshold High Logic Pull-Up/Input Current Output Leakage Current Data Rate Transmitter Output Resistance Output Short-Circuit Current RS-232 Receiver RS-232 Input Voltage Operating Range RS-232 Input Threshold Low RS-232 Input Threshold High RS-232 Input Hysteresis RS-232 Input Resistance TTL/CMOS Output Voltage Low TTL/CMOS Output Voltage High TTL/CMOS Output Short-Circuit Current
(VCC = +5V 10%, TA = 0 to +70C, C1-C4 = 0.1F unless otherwise specified)
Test Conditions Min 5 - 2.0 Normal operation VCC = 0V, VOUT = 15V Normal operation VCC = V+ = V- = 0V, VOUT = 2V VOUT = 0V - - - 300 7 - VCC = 5V, R2IN VCC = 5V, R2IN VCC = 5V IOUT = 3.2mA IOUT = -1.0mA Sourcing, VOUT = GND Shrinking, VOUT = VCC 0V VOUT VCC No load 3k load, both inputs 0.8 - 0.2 3 - 3.5 -2 10 - 4.5 - - 6 Typ 8 1.4 1.4 5 0.01 200 10M 22 - 1.3 1.8 0.5 5 0.2 VCC-0.2 -10 30 0.05 - 4 15 12 Max Unit
All transmitter output loaded with 3k to GND
- 0.85 - 40 10 116 - - 30 - 2.4 1.0 7 0.4 - - - 10 5.5 10 - 30
V V V A A kb/s mA
V V V V k V V mA mA A V mA mA V/s
TTL/CMOS Output Leakage Current Operating Supply Voltage VCC Supply Current Transition Slew Rate
CL = 50pF to 2500pF, RL = 3k to 7k, VCC = 5V, TA = +25C, measured from +3V to -3V or -3V to +3V tPHLT tPLHT tPHLR tPLHR
Transmitter Propagation Delay TTL to RS-232 (normal operation) Receiver Propagation Delay RS-232 to TTL (normal operation)
- - - - - -
1.3 1.5 0.5 0.6 300 100
3.5 3.5 1.0 1.0 - -
s s s s ns ns
Transmitter + to - Propagation Delay tPHLT - tPLHT Difference (normal operation) Receiver + to - Propagation Delay Difference (normal operation) tPHLR - tPLHR
Pin Connection Diagram
Capacitor 1 (+) 1 V+ (+10V) 2 Capacitor 1 (-) 3 Capacitor 2 (+) 4 Capacitor 2 (-) 5 V- (-10V) 6 RS-232 Output 2 7 RS-232 Input 2 8
16 VCC 15 GND 14 RS-232 Output 1 13 RS-232 Input 1 12 TTL/CMOS Out 1 11 TTL/CMOS In 1 10 TTL/CMOS In 2 9 TTL/CMOS Out 2
16
9
1
8
.765 (19.43) Max .180 (4.57) Max
.325 (8.26) Max
.100 (2.54) .700 (17.78)
.115 (2.92) Min

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