TECHNICAL DATA
Presettable Counter
High-Speed Silicon-Gate CMOS
The IN74AC161 is identical in pinout to the LS/ALS161,
HC/HCT161. The device inputs are compatible with standard CMOS
outputs; with pullup resistors, they are compatible with LS/ALS outputs.
The IN74AC161 is programmable 4-bit synchronous modulo-16
counter that feature parallel Load, asynchronous Reset, a Carry Output for
cascading and count-enable controls.
The IN74AC161 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;
0.1
μA
@ 25° C
•
High Noise Immunity Characteristic of CMOS Devices
•
Outputs Source/Sink 24 mA
IN74AC161
ORDERING INFORMATION
IN74AC161N Plastic
IN74AC161D SOIC
T
A
= -40° to 85° C for all packages
LOGIC DIAGRAM
PIN ASSIGNMENT
Outputs
PIN 16 =V
CC
PIN 8 = GND
Inputs
Reset
L
H
H
H
H
H
Load
X
L
H
H
H
X
Enable
P
X
X
X
L
H
X
FUNCTION TABLE
Outputs
Enable
T
X
X
L
X
H
X
Clock
X
Q0
L
P0
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
Rev. 00
IKSEMICON [ IK SEMICON CO., LTD ]
