M74HC4520B1R Просмотр технического описания (PDF) - STMicroelectronics
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M74HC4520B1R Datasheet PDF : 12 Pages
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M74HC4520
INPUT AND OUTPUT EQUIVALENT CIRCUIT
PIN DESCRIPTION
PIN No
1, 9
2, 10
3, 4, 5, 6
7, 15
11, 12, 13,
14
8
16
SYMBOL NAME AND FUNCTION
1CLOCK,
2CLOCK
1CE, 2CE
1Q0 to 1Q3
1CLEAR,
2CLEAR
Clock Inputs (LOW to
HIGH, Edge-Triggered)
Clock Enable Inputs
Data Outputs
Asynchronous Reset
Inputs (Active LOW)
2Q0 tO 2Q3 Data Outputs
GND
Vcc
Ground (0V)
Positive Supply Voltage
TRUTH TABLE
CLOCK
L
X
H
X
X : Don’t Care
Z : High Impedance
INPUTS
CLOCK ENABLE
H
X
L
X
CLEAR
L
L
L
L
L
L
H
FUNCTION
INCREMENT COUNTER
INCREMENT COUNTER
NO CHANGE
NO CHANGE
NO CHANGE
NO CHANGE
Q0 THRU Q3=L
2/12
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