NTE NTE7174

NTE7174
Integrated Circuit
Quad EIA−422 Line Receiver
With Three−State Outputs
Description:
The NTE7174 is a Quad EIA−422/3 Receiver in a 16−Lead DIP type package that features four independent receiver chains which comply with EIA Standards for the Electrical Characteristics of Balanced/Unbalanced Voltage Digital Interface Circuits. The Receiver outputs are 74LS compatible,
three−state structures which are forced to a high impedence state when the appropriate output control
pin reaches a logic zero condition. A PNP device buffers each output pin to assure minimum loading
for either logic one or logic zero inputs. In addition, each receiver chain has internal hysteresis circuitry
to improve noise margain and discourage output instability for slowly changing input waveforms.
Features:
D Four Independent Receiver Chains
D Three−State Outputs
D High Impedance Output Control Inputs (PIA Compatible)
D Internal Hysteresis − 30mV (Typ) @ Zero Volts Common Mode
D Fast Propagation Times − 25ns (Typ)
D TTL Compatible
D Single 5V Supply Voltage
Absolute Maximum Ratings:
Power Supply Voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.0V
Input Common Mode Voltage, VICM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±15
Input Differential Voltage, VID . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±25
Three−State Control Input Voltage, VI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.0Vdc
Output Sink Current, IO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50mA
Storage Temperature Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −65° to +150°C
Operating Junction Temperature, TJ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +150°C
Recommended Operating Conditions:
Parameter
Min
Typ
Max
Unit
VCC
4.75
−
5.25
V
TA
0
−
70
°C
Input Common Mode Voltage
VICR
−7
−
+7
V
Input Differenctial Voltage
VIDR
−
6
−
V
Power Supply Voltage
Operating Ambient Temperature
Symbol
Test Conditions
Electrical Characteristics: (TA = +25°C, VCC = 5V and VIK = 0V, Note 1, unless otherwise specified)
Parameter
Symbol
Test Conditions
Min
Typ
Max
Unit
Input Voltage − High Logic State
VIH
Three−State Control
2.0
−
−
V
Input Voltage − Low Logic State
VIL
Three−State Control
−
−
0.8
V
IO = −0.4mA,
VOH ≥ 2.7V
−
−
0.2
V
IO = 8.8mA,
VOH ≥ 0.5V
−
−
−0.2
V
VI = −10V
−
−
−3.25
mA
VI = −3V
−
−
−1.50
mA
VI = +3V
−
−
+1.50
mA
VI = +10V
−
−
+3.25
mA
IO = −0.4mA,
VID =+0.4mA
2.7
−
−
V
IO = 8.0mA,
VID = −0.4V
−
−
0.5
V
V(ID) = +3.0V, VIL = 0.8V, VOL = 0.5V
−
−
−40
µA
V(ID) = −3.0V, VIL = 0.8V, VOH = 2.7
−
−
40
µA
−15
−
−100
mA
Differential Input Threshold Voltage
Input Bias Current
Input Balance and Output Level
VTH(D)
IIB(D)
VOH
−7V ≤ VIC ≤ +7V,
VIH = 2V, Note 2
VCC = 0V or 5.25V
Other Inputs at 0V
−7V ≤ VIC ≤ 7.0,
VIH = 2V, Note 3
VOL
Output Third State Leakage Current
IOZ
Output Short−Circuit Current
IOS
VI(D) = 3.0V, VIH = 2.0V, VO = 0V, Note 4
Input Current − Low Logic State
lIL
Three−State Control, VIL = 0.5V
−
−
−100
µA
Input Current − High Logic State
lIH
Three−State Control, VIH = 2.7V
−
−
20
µA
Three−State Control, VIH = 5.25V
−
−
100
µA
Input Clamp Diode Voltage
VIK
Three−State Control, lIk = −10mA
−
−
−1.5
V
Power Supply Current
ICC
VIL = 2.0V
−
−
85
mA
Note 1. All currents into device pins are shown as positive, out of device pins are negative. All voltages
referenced to ground unless otherwise noted.
Note 2. Differential input threshold voltage and guaranteed output levels are done simultaneously
for worst case.
Note 3. Refer to EIA−422/3 for exact conditions. Input balance and guaranteed output levels are
done simultaneously for worst case.
Note 4. Only one output at a time should be shorted.
Pin Connection Diagram
Input A
1
16
VCC
Input A
2
15
Inputs B
3−State Control A/C
3
14
Inputs B
Output C
4
13
Output B
Output C
5
12
3−State Control B/D
Inputs C
6
11
Output D
Inputs C
7
10
Input D
GND
8
9
Input D
16
9
1
8
.785 (19.93) Max
.267 (6.79)
.200
(5.08)
.100 (2.54)
.147 (3.7)
.300 (7.62)