NSC DS7820AJ-883 Datasheet
DS7820A/DS8820A
Dual Line Receiver
General Description
The DS7820A and the DS8820Aare improved performance
digital line receivers with two completely independent units
fabricated on a single silicon chip. Intended for use with digital systems connected by twisted pair lines, they have a differential input designed to reject large common mode signals while responding to small differential signals. The output
is directly compatible with TTL or LS integrated circuits.
The response time can be controlled with an external capacitor to reject input noise spikes. The output state is a logic “1”
for both inputs open. Termination resistors for the twisted
pair line are also included in the circuit. Both the DS7820A
and the DS8820A are specified, worst case, over their full
Connection Diagram
Dual-in-Line Package
May 1999
operating temperature range (−55˚C to +125˚C and 0˚C to
70˚C respectively), over the entire input voltage range, for
±
10%supply voltage variations.
Features
n Operation from a single +5V logic supply
n Input voltage range of
n Strobe low forces output to “1” state
n High input resistance
n Fanout of ten with TTL integrated circuits
n Outputs can be wire OR’ed
n Series 54/74 compatible
±
15V
DS7820A/DS8820A Dual Line Receiver
Note 1: Pin 7 connected to bottom of cavity package.
Top View
Order Number DS7820AJ or DS8820AN See NS Package Number J14A or N14A
For Complete Military 883 Specificatons, See RETS Data Sheet.
Order Number DS7820AJ/883
See NS Package Number J14A or W14B
© 1999 National Semiconductor Corporation DS005797 www.national.com
DS005797-2
Absolute Maximum Ratings (Note 3)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Supply Voltage 8.0V
Common-Mode Voltage
Differential Input Voltage
Strobe Voltage 8.0V
Output Sink Current 50 mA
Storage Temperature Range −65˚C to 150˚C
Maximum Power Dissipation (Note 2) at 25˚C
Cavity Package
Molded Package
±
20V
±
20V
1308 mW
1207 mW
Lead Temperature (Soldering, 4 sec.) 260˚C
Operating Conditions
Supply Voltage (V
)
CC
DS7820A 4.5 5.5 V
DS8820A 4.75 5.25 V
Temperature (T
)
A
DS7820A −55 +125 ˚C
DS8820A 0 +70 ˚C
Note 2: Derate cavity package 8.7 mW/˚C above 25˚C; derate molded package 9.7 mW/˚C above 25˚C.
Min Max Units
Electrical Characteristics (Notes 4, 5, 6)
Symbol Parameter Conditions Min Typ Max Units
V
R
R
R
I
I
I
V
V
V
V
I
I
I
Differential Threshold Voltage I
TH
Inverting Input Resistance −15V ≤ VCM≤ +15V 3.6 5 kΩ
I−
Non-Inverting Input Resistance −15V ≤ VCM≤ +15V 1.8 2.5 kΩ
I+
Line Termination Resistance T
T
Inverting Input Current V
I−
Non-Inverting Input Current V
I+
Power Supply Current
CC
One Side Only
Logical “1” Output Voltage I
OH
Logical “0” Output Voltage I
OL
Logical “1” Strobe Input Voltage I
SH
Logical “0” Strobe Input Voltage I
SL
Logical “1” Strobe Input Current V
SH
Logical “0” Strobe Input Current V
SL
Output Short Circuit Current V
SC
Note 3: “Absolute Maximum Ratings” are those values beyond which the safetyofthedevicecannotbeguaranteed.Exceptfor“OperatingTemperature Range” they
are not meant to imply that the devices should be operated at these limits. The table of “Electrical Characteristics” provides conditions for actual device operation.
Note 4: These specifications apply for 4.5V ≤ V
for the DS8820A unless otherwise specified. Typical values given are for V
Note 5: All currents into device pins shown as positive, out of device pins as negative, all voltages referenced to ground unless otherwise noted. All values shown
as max or min on absolute value basis.
Note 6: Only one output at a time should be shorted.
CC
=
−400 µA, −3V ≤ V
OUT
V
≥ 2.5V −15V ≤ VCM≤ +15V 0.06 1.0 V
OUT
=
I
+16 mA, −3V ≤ V
OUT
V
≤ 0.4V −15V ≤ VCM≤ +15V −0.08 −1.0 V
OUT
=
25˚C 120 170 250 Ω
A
=
15V 3.0 4.2 mA
CM
=
V
0V 0 −0.5 mA
CM
=
V
−15V −3.0 −4.2 mA
CM
=
15V 5.0 7.0 mA
CM
=
V
0V −1.0 −1.6 mA
CM
=
V
−15V −7.0 −9.8 mA
CM
=
I
Logical “0” V
OUT
=
−400 µA, V
OUT
=
+16 mA, V
OUT
=
+16 mA, V
OUT
=
−400 µA, V
OUT
=
=
0V, V
5.5V, V
=
0.4V, V
CC
=
STROBE
STROBE
O
≤ 5.5V,−15V ≤ VCM≤ 15V and −55˚C ≤ TA≤ +125˚C for the DS7820A or 4.75V ≤ VCC≤ 5.25V,0˚C ≤ TA≤ +70˚C
DIFF
V
DIFF
=
DIFF
=
−1V 0 0.22 0.4 V
DIFF
≤ 0.4V, V
OUT
≥ 2.5V, V
OUT
=
DIFF
=
DIFF
5.5V, V
STROBE
=
5.0V, T
CC
≤ +3V 0.06 0.5 V
CM
≤ +3V −0.08 −0.5 V
CM
=
−1V V
=
−0.5V, V
=
15V 3.9 6.0 mA
CM
=
−15V 9.2 14.0 mA
V
CM
=
0V 6.5 10.2 mA
CM
1V 2.5 4.0 5.5 V
=
−3V 2.1 V
DIFF
=
−3V 0.9 V
DIFF
3V 0.01 5.0 µA
−3V −1.0 −1.4 mA
=
0V −2.8 −4.5 −6.7 mA
=
25˚C and V
A
=
0V unless stated differently.
CM
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Switching Characteristics
=
T
25˚C, V
A
Symbol Parameter Conditions Min Typ Max Units
t
pd0
t
pd1
t
pd0
t
pd1
=
5V, unless otherwise noted
CC
Propagation Delay, Differential
Input to “0” Output
Propagation Delay, Differential
Input to “1” Output
Propagation Delay, Strobe
Input to “0” Output
Propagation Delay, Strobe
Input to “1” Output
R
L
=
400 Ω,C
=
15 pF, see
L
30 45 ns
27 40 ns
Figure 1
16 25 ns
18 30 ns
AC Test Circuit and Waveforms
Note 7: *Includes Jig and Probe Capacitance
A=Differential Input to “0” Output
B=Differential Input to “1” Output
C=Strobe Input to “0” Output
D=Strobe Input to “1” Output
DS005797-7
DS005797-8
FIGURE 1.
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