NTE NTE7142 Datasheet

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, V
Input Voltage, T
Input Voltage, R

CC

IN

IN

Output Voltage (Note 2), T
Output Voltage, R

OUT

–0.3V to (VCC–0.3V). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

OUT

–0.3V to (VCC+0.3V). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

–0.3V to +6V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

±30V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

±15V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Driver/Receiver Output Short Circuited to GND Continuous. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Continuous Power Dissipation (TA = +70°C), P

D

842mW. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Dreate Above +70°C 10.53mW/°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Operating Temperature Range, T
Storage Temperature Range, T

opr

stg

Lead Temperature (During Soldering, 10sec), T

L

0° to +70°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

–65° to +160°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

+300°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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 T

in high–impedance state, VCC = 0V.

OUT

Electrical Characteristics: (VCC = +5 V ±10%, TA = 0° to +70°C, C1–C4 = 0.1µF unless otherwise

specified)

Parameter Test Conditions Min Typ Max Unit

RS–232 Transmitter

Output Voltage Swing All transmitter output loaded with 3kΩ to GND ±5 ±8 – V
Input Logic Threshold Low – 1.4 0.85 V
Input Logic Threshold High 2.0 1.4 – V
Logic Pull–Up/Input Current Normal operation – 5 40 µA
Output Leakage Current VCC = 0V, V

= ±15V – ±0.01 ±10 µA

OUT

Data Rate Normal operation – 200 116 kb/s
Transmitter Output Resistance VCC = V+ = V– = 0V, V
Output Short–Circuit Current V

= 0V ±7 ±22 – mA

OUT

= ±2V 300 10M – Ω

OUT

RS–232 Receiver

RS–232 Input Voltage Operating

– – ±30 V

Range
RS–232 Input Threshold Low VCC = 5V, R2
RS–232 Input Threshold High VCC = 5V, R2

IN
IN

0.8 1.3 – V
– 1.8 2.4 V

RS–232 Input Hysteresis VCC = 5V 0.2 0.5 1.0 V
RS–232 Input Resistance 3 5 7 kΩ
TTL/CMOS Output Voltage Low I
TTL/CMOS Output Voltage High I
TTL/CMOS Output Short–Circuit

Current

TTL/CMOS Output Leakage Current 0V ≤ V

= 3.2mA – 0.2 0.4 V

OUT

= –1.0mA 3.5 VCC–0.2 – V

OUT

Sourcing, V
Shrinking, V

OUT

= GND –2 –10 – mA

OUT

OUT

≤ V

CC

= V

CC

10 30 – mA

– ±0.05 ±10 µA

Operating Supply Voltage 4.5 – 5.5 V
VCC Supply Current No load – 4 10 mA

3kΩ load, both inputs – 15 – mA

Transition Slew Rate CL = 50pF to 2500pF, RL = 3kΩ to 7kΩ,

VCC = 5V, TA = +25°C, measured from
+3V to –3V or –3V to +3V

Transmitter Propagation Delay

TTL to RS–232 (normal operation)

Receiver Propagation Delay

RS–232 to TTL (normal operation)

Transmitter + to – Propagation Delay

t

PHLT

t

PLHT

t

PHLR

t

PLHR

t

PHLT

– t

PLHT

Difference (normal operation)

Receiver + to – Propagation Delay

t

PHLR

– t

PLHR

Difference (normal operation)

6 12 30 V/µs

– 1.3 3.5 µs
– 1.5 3.5 µs
– 0.5 1.0 µs
– 0.6 1.0 µs
– 300 – ns

– 100 – ns