DS8820 [NSC]
Dual Line Receiver; 双线路接收器
| 型号： | DS8820 |
| 厂家： | 
National Semiconductor |
| 描述： | Dual Line Receiver |
| 文件： | 总8页 (文件大小：253K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
May 1999
DS7820A/DS8820A
Dual Line Receiver
operating temperature range (−55˚C to +125˚C and 0˚C to
70˚C respectively), over the entire input voltage range, for
General Description
The DS7820A and the DS8820A are improved performance
digital line receivers with two completely independent units
fabricated on a single silicon chip. Intended for use with digi-
tal systems connected by twisted pair lines, they have a dif-
ferential input designed to reject large common mode sig-
nals while responding to small differential signals. The output
is directly compatible with TTL or LS integrated circuits.
±
10% supply voltage variations.
Features
n Operation from a single +5V logic supply
±
n Input voltage range of 15V
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
The response time can be controlled with an external capaci-
tor 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
DS005797-2
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
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Absolute Maximum Ratings (Note 3)
Lead Temperature (Soldering, 4 sec.)
260˚C
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Operating Conditions
Min
Max
Units
Supply Voltage
8.0V
Supply Voltage (VCC
)
±
±
Common-Mode Voltage
Differential Input Voltage
Strobe Voltage
20V
20V
DS7820A
4.5
5.5
V
V
DS8820A
4.75
5.25
8.0V
50 mA
Temperature (TA)
DS7820A
Output Sink Current
Storage Temperature Range
−55
0
+125
+70
˚C
˚C
−65˚C to 150˚C
DS8820A
Maximum Power Dissipation (Note 2) at 25˚C
Note 2: Derate cavity package 8.7 mW/˚C above 25˚C; derate molded pack-
age 9.7 mW/˚C above 25˚C.
Cavity Package
Molded Package
1308 mW
1207 mW
Electrical Characteristics (Notes 4, 5, 6)
Symbol
Parameter
Conditions
Min
Typ
0.06
0.06
Max Units
=
VTH
Differential Threshold Voltage
IOUT −400 µA,
−3V ≤ VCM ≤ +3V
−15V ≤ VCM ≤ +15V
−3V ≤ VCM ≤ +3V
−15V ≤ VCM ≤ +15V
0.5
1.0
V
VOUT ≥ 2.5V
V
=
IOUT +16 mA,
−0.08 −0.5
V
VOUT ≤ 0.4V
−0.08 −1.0
V
RI−
RI+
RT
II−
Inverting Input Resistance
Non-Inverting Input Resistance
Line Termination Resistance
Inverting Input Current
−15V ≤ VCM ≤ +15V
−15V ≤ VCM ≤ +15V
3.6
1.8
120
5
kΩ
kΩ
Ω
2.5
=
TA 25˚C
170
3.0
250
4.2
=
VCM 15V
mA
mA
mA
mA
mA
mA
mA
=
VCM 0V
0
−0.5
−4.2
7.0
=
VCM −15V
−3.0
5.0
=
VCM 15V
II+
Non-Inverting Input Current
=
VCM 0V
−1.0
−7.0
3.9
−1.6
−9.8
6.0
=
VCM −15V
=
= =
VDIFF −1V VCM 15V
ICC
Power Supply Current
One Side Only
IOUT Logical “0”
=
VCM −15V
9.2
6.5
14.0
10.2
5.5
mA
mA
V
=
=
VDIFF −0.5V, VCM 0V
=
=
VOH
VOL
VSH
VSL
ISH
Logical “1” Output Voltage
Logical “0” Output Voltage
IOUT −400 µA, VDIFF 1V
2.5
0
4.0
=
=
IOUT +16 mA, VDIFF −1V
0.22
0.4
V
=
=
Logical “1” Strobe Input Voltage IOUT +16 mA, VOUT ≤ 0.4V, VDIFF −3V
2.1
V
=
=
Logical “0” Strobe Input Voltage IOUT −400 µA, VOUT ≥ 2.5V, VDIFF −3V
0.9
5.0
V
=
=
Logical “1” Strobe Input Current VSTROBE 5.5V, VDIFF 3V
0.01
−1.0
−4.5
µA
mA
mA
=
=
ISL
Logical “0” Strobe Input Current VSTROBE 0.4V, VDIFF −3V
−1.4
−6.7
=
=
=
ISC
Output Short Circuit Current
VO 0V, VCC 5.5V, VSTROBE 0V
−2.8
Note 3: “Absolute Maximum Ratings” are those values beyond which the safety of the device cannot be guaranteed. Except for “Operating Temperature 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 ≤ 5.5V, −15V ≤ V
CC CM
≤ 15V and −55˚C ≤ T ≤ +125˚C for the DS7820A or 4.75V ≤ V ≤ 5.25V, 0˚C ≤ T ≤ +70˚C
A
CC
A
=
=
=
0V unless stated differently.
CM
for the DS8820A unless otherwise specified. Typical values given are for V
CC
5.0V, T
25˚C and V
A
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.
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2
Switching Characteristics
=
=
TA 25˚C, VCC 5V, unless otherwise noted
Symbol
Parameter
Conditions
Min
Typ
Max
Units
tpd0
Propagation Delay, Differential
Input to “0” Output
30
45
ns
tpd1
tpd0
tpd1
Propagation Delay, Differential
Input to “1” Output
27
16
18
40
25
30
ns
ns
ns
=
=
RL 400 Ω, CL 15 pF, see Figure 1
Propagation Delay, Strobe
Input to “0” Output
Propagation Delay, Strobe
Input to “1” Output
AC Test Circuit and Waveforms
DS005797-7
Note 7: *Includes Jig and Probe Capacitance
DS005797-8
=
=
=
=
A
B
C
D
Differential Input to “0” Output
Differential Input to “1” Output
Strobe Input to “0” Output
Strobe Input to “1” Output
FIGURE 1.
3
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Typical Performance Characteristics
Supply Voltage Sensitivity
Common-Mode Voltage
Temperature Sensitivity
Sensitivity
DS005797-6
DS005797-10
DS005797-9
Transfer Function
Termination Resistance
Input Characteristics
Output Voltage Levels
Noise Rejection
DS005797-12
DS005797-13
DS005797-11
Power Supply Current
Internal Power Dissipation
DS005797-14
DS005797-15
DS005797-16
Differential Input Delays
Strobe Delays
DS005797-17
DS005797-18
DS005797-19
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4
Schematic Diagram
DS005797-1
Note 8: Schematic shows one-half of unit.
Typical Applications
Differential Line Driver and Receiver
DS005797-3
Note 9: Optional to control response time.
Single Ended (EIA-RS232C) Receiver with Hysteresis
5
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Typical Applications (Continued)
DS005797-5
=
(Output “1” for Open Input)
DS005797-4
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6
Physical Dimensions inches (millimeters) unless otherwise noted
Ceramic Dual-In-Line Package (J)
Order Number DS7820AJ or DS7820AJ/883
NS Package Number J14A
7
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Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
Molded Dual-In-Line Package (N)
Order Number DS8820AN
NS Package Number N14A
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