NTE7142
Integrated Circuit
+5VPowered, Multichannel RS232 Driver/Receiver
Description:
The NTE7142 is a multichannel RS232 driver/receiver in a 16Lead DIP type package intended for
all EIA/TIA232E 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/TIA232E and V.28 Specifications
D
Multiple Drivers and Receivers
D
3State Driver and Receiver Outputs
Applications:
D
Portable Computers
D
LowPower Modems
D
Interface Translation
D
BatteryPowered RS232 Systems
D
Multidrop RS232 Networks
Absolute Maximum Ratings: (Note 1)
Supply Voltage, V
CC
0.3V to +6V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input Voltage, T
IN
0.3V to (V
CC
0.3V)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input Voltage, R
IN
30V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Output Voltage (Note 2), T
OUT
15V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Output Voltage, R
OUT
0.3V to (V
CC
+0.3V)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Driver/Receiver Output Short Circuited to GND
Continuous
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Continuous Power Dissipation (T
A
= +70
C), P
D
842mW
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Dreate Above +70
C
10.53mW/
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating Temperature Range, T
opr
0
to +70
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage Temperature Range, T
stg
65
to +160
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Lead Temperature (During Soldering, 10sec), T
L
+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
OUT
in highimpedance state, V
CC
= 0V.
Electrical Characteristics:
(V
CC
= +5V
10%, T
A
= 0
to +70
C, C1C4 = 0.1
F unless otherwise
specified)
Parameter
Test Conditions
Min
Typ
Max
Unit
RS232 Transmitter
Output Voltage Swing
All transmitter output loaded with 3k
to GND
5
8
V
Input Logic Threshold Low
1.4
0.85
V
Input Logic Threshold High
2.0
1.4
V
Logic PullUp/Input Current
Normal operation
5
40
A
Output Leakage Current
V
CC
= 0V, V
OUT
=
15V
0.01
10
A
Data Rate
Normal operation
200
116
kb/s
Transmitter Output Resistance
V
CC
= V+ = V = 0V, V
OUT
=
2V
300
10M
Output ShortCircuit Current
V
OUT
= 0V
7
22
mA
RS232 Receiver
RS232 Input Voltage Operating
Range
30
V
RS232 Input Threshold Low
V
CC
= 5V, R2
IN
0.8
1.3
V
RS232 Input Threshold High
V
CC
= 5V, R2
IN
1.8
2.4
V
RS232 Input Hysteresis
V
CC
= 5V
0.2
0.5
1.0
V
RS232 Input Resistance
3
5
7
k
TTL/CMOS Output Voltage Low
I
OUT
= 3.2mA
0.2
0.4
V
TTL/CMOS Output Voltage High
I
OUT
= 1.0mA
3.5
V
CC
0.2
V
TTL/CMOS Output ShortCircuit
Sourcing, V
OUT
= GND
2
10
mA
Current
Shrinking, V
OUT
= V
CC
10
30
mA
TTL/CMOS Output Leakage Current
0V
V
OUT
V
CC
0.05
10
A
Operating Supply Voltage
4.5
5.5
V
V
CC
Supply Current
No load
4
10
mA
3k
load, both inputs
15
mA
Transition Slew Rate
C
L
= 50pF to 2500pF, R
L
= 3k
to 7k
,
V
CC
= 5V, T
A
= +25
C, measured from
+3V to 3V or 3V to +3V
6
12
30
V/
s
Transmitter Propagation Delay
t
PHLT
1.3
3.5
s
TTL to RS232 (normal operation)
t
PLHT
1.5
3.5
s
Receiver Propagation Delay
t
PHLR
0.5
1.0
s
RS232 to TTL (normal operation)
t
PLHR
0.6
1.0
s
Transmitter + to Propagation Delay
Difference (normal operation)
t
PHLT
t
PLHT
300
ns
Receiver + to Propagation Delay
Difference (normal operation)
t
PHLR
t
PLHR
100
ns
PDF 
ZIP