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M74HC191TTR Fiches technique(PDF) 2 Page - STMicroelectronics

No de pièce M74HC191TTR
Description  4 BIT SYNCHRONOUS UP/DOWN COUNTERS
Download  14 Pages
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Fabricant  STMICROELECTRONICS [STMicroelectronics]
Site Internet  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

M74HC191TTR Fiches technique(HTML) 2 Page - STMicroelectronics

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M74HC191
2/14
INPUT AND OUTPUT EQUIVALENT CIRCUIT
PIN DESCRIPTION
TRUTH TABLE
X : Don’t Care
a - d : The level of steady state inputs a through d respectively
PIN No
SYMBOL
NAME AND FUNCTION
3, 2, 6, 7
QA to QD
Flip-Flop Outputs
4
ENABLE
Count Enable Input
(Active LOW)
5U/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
Clock Input (LOW to
HIGH, edge triggered)
15, 1, 10, 9
DA to DD
Data Inputs
8
GND
Ground (0V)
16
Vcc
Positive Supply Voltage
INPUTS
OUTPUTS
FUNCTION
LOAD
ENABLE
D/U
CLOCK
QAQBQCQD
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


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