IN74AC161 Ver la hoja de datos (PDF) - Integral Corp.
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IN74AC161 Datasheet PDF : 8 Pages
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TECHNICAL DATA
IN74AC161
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
LOGIC DIAGRAM
ORDERING INFORMATION
IN74AC161N Plastic
IN74AC161D SOIC
TA = -40° to 85° C for all
packages
Outputs
PIN ASSIGNMENT
PIN 16 =VCC
PIN 8 = GND
FUNCTION TABLE
Inputs
Outputs
Reset Load Enable Enable Clock Q0 Q1 Q2 Q3
P
T
Function
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
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