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M54HC4518 Datasheet(PDF) 4 Page - STMicroelectronics

Part No. M54HC4518
Description  HC4518 DUAL DECADE COUNTER HC4520 DUAL 4 BIT BINARY COUNTER
Download  13 Pages
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Maker  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
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M54HC4518 Datasheet(HTML) 4 Page - STMicroelectronics

 
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TRUTH TABLE
INPUTS
FUNCTION
CLOCK
ENABLE
CLEAR
H
L
INCREMENT COUNTER
L
L
INCREMENT COUNTER
X
L
NO CHANGE
X
L
NO CHANGE
L
L
NO CHANGE
H
L
NO CHANGE
X
X
H
Q0 THRU Q3 = L
X: Don’t Care Z: High Impedance
INPUT AND OUTPUT EQUIVALENT CIRCUIT
PIN DESCRIPTION
PIN No
SYMBOL
NAME AND FUNCTION
1, 9
1CLOCK,
2CLOCK
Clock Inputs (LOW to
HIGH, Edge-triggered)
2, 10
1ENABLE,
2ENABLE
Clock Enable Inputs
3, 4, 5, 6
1Q0 to 1Q3
Data Outputs
7, 15
1CLEAR,
2CLEAR
Asynchronous Reset
Inputs (Active LOW)
11, 12, 13,
14
2Q0 to 2Q3
Data Outputs
8
GND
Ground (0V)
16
VCC
Positive Supply Voltage
IEC LOGIC SYMBOLS
HC4518
HC4520
M54/M74HC4518/4520
4/13


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