74HC191U 데이터 시트보기 (PDF) - Philips Electronics
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74HC191U Datasheet PDF : 14 Pages
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Philips Semiconductors
Presettable synchronous 4-bit binary
up/down counter
Product specification
74HC/HCT191
PIN DESCRIPTION
PIN NO.
3, 2, 6, 7
4
5
8
11
12
13
14
15, 1, 10, 9
16
SYMBOL
Q0 to Q3
CE
U/D
GND
PL
TC
RC
CP
D0 to D3
VCC
NAME AND FUNCTION
flip-flop outputs
count enable input (active LOW)
up/down input
ground (0 V)
parallel load input (active LOW)
terminal count output
ripple clock output (active LOW)
clock input (LOW-to-HIGH, edge triggered)
data inputs
positive supply voltage
Fig.1 Pin configuration.
Fig.2 Logic symbol.
Fig.3 IEC logic symbol.
December 1990
4
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