DS7640 [NSC]
Quad NOR Unified Bus Receiver; 四NOR统一总线接收器
| 型号： | DS7640 |
| 厂家： | 
National Semiconductor |
| 描述： | Quad NOR Unified Bus Receiver |
| 文件： | 总4页 (文件大小：104K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
February 1996
DS7640/DS8640 Quad NOR Unified Bus Receiver
General Description
Features
Y
e
0V
Low input current with normal
(30 mA typ)
V
or
V
The DS7640 and DS8640 are quad 2-input receivers de-
signed for use in bus organized data transmission systems
interconnected by terminated 120X impedance lines. The
external termination is intended to be 180X resistor from
CC
CC
Y
High noise immunity (1.1V typ)
Y
Temperature-insensitive input thresholds track bus logic
levels
a
the bus to the 5V logic supply together with a 390X resis-
tor from the bus to ground. The design employs a built-in
input threshold providing substantial noise immunity. Low
input current allows up to 27 driver/receiver pairs to utilize a
common bus.
Y
Y
TTL compatible output
Matched, optimized noise immunity for ‘‘1’’ and ‘‘0’’
levels
Y
High speed (19 ns typ)
Connection Diagram
Dual-In-Line Package
TL/F/5805–1
Top View
Order Number DS7640J or DS8640N
See NS Package Number J14A or N14A
Typical Application
120X Unified Data Bus
TL/F/5805–2
C
1996 National Semiconductor Corporation
TL/F/5805
RRD-B30M36/Printed in U. S. A.
http://www.national.com
Absolute Maximum Ratings (Note 1)
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 (V
DS7640
)
CC
4.5
5.5
V
V
Supply Voltage
7.0V
5.5V
DS8640
4.75
5.25
Temperature (T )
A
Input Voltage
b
a
125
DS7640
DS8640
55
C
§
§
b
a
65 C to 150 C
Storage Temperature Range
§
§
a
0
70
C
Maximum Power Dissipation* at 25 C
Cavity Package
Molded Package
§
1308 mW
1207 mW
Lead Temperature (Soldering, 4 seconds)
260 C
§
*Derate cavity package 8.7 mW/ C above 25 C; derate molded package
§
§
9.7 mW/ C above 25 C.
§
§
Electrical Characteristics
The following apply for V
MIN
s
s
s
s
V
CC
V , T
MAX MIN
T
A
T , unless otherwise specified (Notes 2 and 3)
MAX
Symbol
Parameter
Conditions
DS7640
Min
1.80
1.70
Typ
1.50
1.50
1.50
1.50
30
Max
Units
V
e
V
OL
V
High Level Input Threshold
Low Level Input Threshold
Maximum Input Current
V
V
V
V
IH
IL
OUT
DS8640
DS7640
DS8640
V
e
V
V
OH
1.20
1.30
80
V
OUT
V
e
e
e
I
I
4V
V
CC
V
CC
V
mA
mA
mA
V
IH
IN
MAX
0V
1.0
50
e
e
V
Maximum Input Current
Output Voltage
0.4V, V
1.0
50
IL
IN
OH
OL
CC
MAX
e b
e
V
V
I
I
400 mA, V
IN
2.4
OH
OL
IL
e
e
e
e
V
Output Voltage
16 mA, V
IN
V
IH
0.25
25
0.4
V
e
e
b
b
55
40
I
I
Output Short Circuit Current
Power Supply Current
V
0.5V, V
OS
0V, V
V
MAX
, (Note 4)
18
mA
mA
OS
CC
IN
IN
CC
V
4V, (Per Package)
e
Switching Characteristics T
25 C, nominal power supplies unless otherwise noted
§
A
Symbol
Parameter
Conditions
Input to Logic ‘‘1’’ Output
Input to Logic ‘‘0’’ Output
Min
10
Typ
23
Max
35
Units
ns
t
pd
Propagation Delays
(Notes 5 and 6)
10
15
30
ns
Note 1: ‘‘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.
b
a
a
Note 2: Unless otherwise specified min/max limits apply across the 55 C to 125 C temperature range for the DS7640 and across the 0 C to 70 C range for
§
§
§
§
e
e
5V.
the DS8640. All typical values are T
25 C and V
§
Note 3: 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
A
CC
as max or min on absolute value basis.
Note 4: Only one output at a time should be shorted.
e
e
e
e
0V to 3V pulse.
IN
Note 5: Fan-out of 10 load, C
LOAD
15 pF total, measured from V
1.5V to V
1.5V, V
IN
OUT
e
e
25 C.
Note 6: Apply to V
CC
5V, T
§
A
http://www.national.com
2
Physical Dimensions inches (millimeters)
Ceramic Dual-In-Line Package (J)
Order Number DS7640J
NS Package Number J14A
3
http://www.national.com
Physical Dimensions inches (millimeters) (Continued)
Molded Dual-In-Line Package (N)
Order Number DS8640N
NS Package Number N14A
LIFE SUPPORT POLICY
NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT
DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF NATIONAL
SEMICONDUCTOR CORPORATION. As used herein:
1. Life support devices or systems are devices or
systems which, (a) are intended for surgical implant
into the body, or (b) support or sustain life, and whose
failure to perform, when properly used in accordance
with instructions for use provided in the labeling, can
be reasonably expected to result in a significant injury
to the user.
2. A critical component is any component of a life
support device or system whose failure to perform can
be reasonably expected to cause the failure of the life
support device or system, or to affect its safety or
effectiveness.
National Semiconductor
Corporation
National Semiconductor
Europe
National Semiconductor
Hong Kong Ltd.
National Semiconductor
Japan Ltd.
a
1111 West Bardin Road
Arlington, TX 76017
Tel: 1(800) 272-9959
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@
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a
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a
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a
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a
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National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications.
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