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M74HC191M1R bảng dữ liệu(PDF) 2 Page - STMicroelectronics

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INPUT AND OUTPUT EQUIVALENT CIRCUIT
TRUTH TABLE
INPUTS
OUTPUS
FUNCTION
LOAD
ENABLE
D/U
CLOCK
QA
QB
QC
QD
L
X
X
X
a
b
c
d
PRESET DATA
H
L
L
UP COUNT
UP COUNT
H
L
H
DOWN COUNT
DOWN COUNT
H
H
X
NO CHANGE
NO COUNT
H
X
X
NO CHANGE
NO COUNT
X: Don’t Care
a - d: The level of steady state inputs at inputs a through D respectively
PIN DESCRIPTION
PIN No
SYMBOL
NAME AND FUNCTION
3, 2, 6, 7
QA to QD
Flip-Flop Outputs
4
ENABLE
Count Enable Input
(Active LOW)
5
U/D
Parallel Data Input
11
LOAD
Load Input (Active LOW)
12
MA/MI OUT
Terminal Count Output
13
RC
Ripple Clock Output
(Active LOW)
14
CLOCK
Cloack Input (LOW to
HIGH, Edge-triggered)
15, 1, 10, 9
DA to DD
Data Inputs
8
GND
Ground (0V)
16
VCC
Positive Supply Voltage
IEC LOGIC SYMBOL (HC191)
IEC LOGIC SYMBOL (HC190)
M54/M74HC190/191
2/14


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