SN54/74LS160A
SN54/74LS161A
SN54/74LS162A
SN54/74LS163A
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.)
BCD DECADE COUNTERS/
4-BIT BINARY COUNTERS
The LS160A and LS161A have an asynchronous Master Reset (Clear)
input that overrides, and is independent of, the clock and all other control
inputs.TheLS162AandLS163AhaveaSynchronousReset(Clear)inputthat
overrides all other control inputs, but is active only during the rising clock
edge.
LOW POWER SCHOTTKY
BCD (Modulo 10)
LS160A
Binary (Modulo 16)
LS161A
J SUFFIX
CERAMIC
CASE 620-09
Asynchronous Reset
Synchronous Reset
LS162A
LS163A
16
1
• 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
N SUFFIX
PLASTIC
CASE 648-08
16
1
CONNECTION DIAGRAM DIP (TOP VIEW)
D SUFFIX
SOIC
CASE 751B-03
NOTE:
16
The Flatpak version
has the same pinouts
(Connection Diagram) as
the Dual In-Line Package.
1
ORDERING INFORMATION
*MR for LS160A and LS161A
*SR for LS162A and LS163A
SN54LSXXXJ Ceramic
SN74LSXXXN Plastic
SN74LSXXXD SOIC
PIN NAMES
LOADING (Note a)
LOGIC SYMBOL
HIGH
LOW
PE
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)
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.
P –P
0
3
CEP
CET
CP
MR
SR
Q –Q
5 (2.5) U.L.
5 (2.5) U.L.
0
3
TC
Terminal Count Output (Note b)
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.
*MR for LS160A and LS161A
*SR for LS162A and LS163A
FAST AND LS TTL DATA
5-278