SL74HC161
Presettable Counters
High-Performance Silicon-Gate CMOS
The SL74HC161 is identical in pinout to the LS/ALS161. The device
inputs are compatible with standard CMOS outputs; with pullup
resistors, they are compatible with LS/ALSTTL outputs.
The SL74HC161 is programmable 4-bit synchronous counter that
feature parallel Load, asynchronous Reset, a Carry Output for
cascading and count-enable controls.
The SL74HC161 is binary counter with asynchronous Reset.
•
Outputs Directly Interface to CMOS, NMOS, and TTL
•
Operating Voltage Range: 2.0 to 6.0 V
•
Low Input Current: 1.0
µA
•
High Noise Immunity Characteristic of CMOS Devices
LOGIC DIAGRAM
ORDERING INFORMATION
SL74HC161N Plastic
SL74HC161D SOIC
T
A
= -55° to 125° C for all packages
PIN ASSIGNMENT
PIN 16 =V
CC
PIN 8 = GND
FUNCTION TABLE
Inputs
Reset
L
H
H
H
H
H
Load
X
L
H
H
H
X
Enable
P
X
X
X
L
H
X
Enable
T
X
X
L
X
H
X
Clock
X
Q0
L
P0
Outputs
Q1
L
P1
Q2
L
P2
Q3
L
P3
Function
Reset to “0”
Preset Data
No count
No count
Count
No count
No change
No change
Count up
No change
X=don’t care
P0,P1,P2,P3 = logic level of Data inputs
Ripple Carry Out = Enable T
•
Q0
•
Q1
•
Q2
•
Q3
SLS
System Logic
Semiconductor
SLS [ SYSTEM LOGIC SEMICONDUCTOR ]
