IN74HC161A Datasheet, PDF (1/9 Pages) Integral Corp. – PRESETTABLE COUNTERS

IN74HC161A
PRESETTABLE COUNTERS
High-Performance Silicon-Gate CMOS
The IN74HC161A 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 IN74HC161A is programmable 4-bit synchronous counter
that feature parallel Load, asynchronous Reset, a Carry Output
for cascading and count-enable controls.
The IN74HC161A 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
IN74HC161AN Plastic
IN74HC161AD SOIC
T_A = -55° to 125° C for all
packages
PIN ASSIGNMENT
PIN 16 =V_CC
PIN 8 = GND
FUNCTION TABLE
Inputs
Outputs
Rese Load Enable Enable Clock Q0 Q1 Q2 Q3 Function
t
P
T
L
X
X
X
X
L L L L Reset to “0”
H
L
X
X
P0 P1 P2 P3 Preset Data
H
H
X
L
No change
No count
H
H
L
X
No change
No count
H
H
H
H
Count up
Count
H
X
X
X
No change
No count
X=don’t care
P0,P1,P2,P3 = logic level of Data inputs
Ripple Carry Out = Enable T • Q0 • Q1 • Q2 • Q3
1