数字电路分析与故障诊断 四位二进制计数器74LS161.pdf
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5-1
FAST AND LS TTL DATA
BCD DECADE COUNTERS/
4-BIT BINARY COUNTERS
The LS160A/161A/162A/163A are high-speed 4-bit synchronous count-
ers. They are edge-triggered, synchronously presettable, and cascadable
MSI building blocks for counting, memory addressing, frequency division and
other applications. The LS160A and LS162A count modulo 10 (BCD). The
LS161A and LS163A count modulo 16 (binary.)
The LS160A and LS161A have an asynchronous Master Reset (Clear)
input that overrides, and is independent of, the clock and all other control
inputs. The LS162A and LS163A have a Synchronous Reset (Clear) input that
overrides all other control inputs, but is active only during the rising clock
edge.
BCD (Modulo 10) Binary (Modulo 16)
Asynchronous Reset LS160A LS161A
Synchronous Reset LS162A LS163A
• Synchronous Counting and Loading
• Two Count Enable Inputs for High Speed Synchronous Expansion
• Terminal Count Fully Decoded
• Edge-Triggered Operation
• Typical Count Rate of 35 MHz
• ESD > 3500 Volts
CONNECTION DIAGRAM DIP (TOP VIEW)
NOTE:
The Flatpak version
has the same pinouts
(Connection Diagram) as
the Dual In-Line Package.
14 13 12 11 10 9
123456
7
16 15
8
V
CC
*R
TC Q
0
Q
1
Q
2
CETQ
3
PE
CP P
0
P
1
P
2
P
3
CEP GND
*MR for LS160A and LS161A
*SR for LS162A and LS163A
PIN NAMES LOADING (Note a)
HIGH
LOW
PE
P
0
–P
3
CEP
CET
CP
MR
SR
Q
0
–Q
3
TC
Parallel Enable (Active LOW) Input
Parallel Inputs
Count Enable Parallel Input
Count Enable Trickle Input
Clock (Active HIGH Going Edge) Input
Master Reset (Active LOW) Input
Synchronous Reset (Active LOW) Input
Parallel Outputs (Note b)
Terminal Count Output (Note b)
1.0 U.L.
0.5 U.L.
0.5 U.L.
1.0 U.L.
0.5 U.L.
0.5 U.L.
1.0 U.L.
10 U.L.
10 U.L.
0.5 U.L.
0.25 U.L.
0.25 U.L.
0.5 U.L.
0.25 U.L.
0.25 U.L.
0.5 U.L.
5 (2.5) U.L.
5 (2.5) U.L.
NOTES:
a) 1 TTL Unit Load (U.L.) = 40 µA HIGH/1.6 mA LOW.
b) The Output LOW drive factor is 2.5 U.L. for Military (54) and 5 U.L. for Commercial (74)
Temperature Ranges.
SN54/74LS160A
SN54/74LS161A
SN54/74LS162A
SN54/74LS163A
BCD DECADE COUNTERS/
4-BIT BINARY COUNTERS
LOW POWER SCHOTTKY
J SUFFIX
CERAMIC
CASE 620-09
N SUFFIX
PLASTIC
CASE 648-08
16
1
16
1
ORDERING INFORMATION
SN54LSXXXJ Ceramic
SN74LSXXXN Plastic
SN74LSXXXD SOIC
16
1
D SUFFIX
SOIC
CASE 751B-03
LOGIC SYMBOL
V
CC
= PIN 16
GND = PIN 8
93456
7
10
2
15
114131211
PE P
0
P
1
P
2
P
3
CEP
CET
CP
*R Q
0
Q
1
Q
2
Q
3
TC
*MR for LS160A and LS161A
*SR for LS162A and LS163A
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