Datasheet

INPUT AND OUTPUT EQUIVALENT CIRCUIT
PIN DESCRIPTION (HC4020)
PIN No SYMBOL NAME AND FUNCTION
9, 7, 6, 5,
3, 2, 4, 13,
12, 14, 15,
1
Q1, Q4 to
Q14
Parallel Outputs
10 CLOCK Clock Input (LOW to
HIGH, edge triggered)
11 CLEAR Reset Inputs
8 GND Ground (0V)
16 V
CC
Positive Supply Voltage
IEC LOGIC SYMBOLS
PIN DESCRIPTION (HC4040)
PIN No SYMBOL NAME AND FUNCTION
9, 7, 6, 5,
3, 2, 4, 13,
12, 14, 15,
1
Q1 to Q12 Parallel Outputs
10 CLOCK Clock Input (LOW to
HIGH, edge triggered)
11 CLEAR Reset Inputs
8 GND Ground (0V)
16 V
CC
Positive Supply Voltage
TRUTH TABLE
CLOCK CLEAR OUTPUT STATE
X H ALL OUTPUTS = ”L”
L NO CHANGE
L ADVANCE TO NEXT STATE
HC4020 HC4040
M54/M74HC4020/4040
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