M74HC192 查看數據表（PDF） - STMicroelectronics
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M74HC192 Datasheet PDF : 14 Pages
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M74HC192
INPUT AND OUTPUT EQUIVALENT CIRCUIT
TRUTH TABLE
COUNT UP
H
H
X
X
X : Don’t Care
COUNT DOWN
H
H
X
X
LOAD
H
H
H
H
L
X
PIN DESCRIPTION
PIN No
3, 2, 6, 7
4
5
11
12
13
14
15, 1, 10, 9
8
16
SYMBOL NAME AND FUNCTION
QA to QD
COUNT
DOWN
Flip-Flop Outputs
Count Down Clock Input
COUNT UP Count Up Clock Input
LOAD
CARRY
BORROW
CLEAR
A to D
GND
Vcc
Asynchronous Parallel
Load Input (Active LOW)
Count Up (Carry)
Output (Active LOW)
Count Down (Borrow)
Output (Active LOW)
Asynchronous Reset
Input (Active High)
Data Inputs
Ground (0V)
Positive Supply Voltage
CLEAR
L
L
L
L
L
H
FUNCTION
COUNT UP
NO COUNT
COUNT DOWN
NO COUNT
PRESET
RESET
2/14
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