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M74HC161B1R Datasheet(PDF) 2 Page - STMicroelectronics

No. de pieza M74HC161B1R
Descripción Electrónicos  SYNCHRONOUS PRESETTABLE 4-BIT COUNTER
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

M74HC161B1R Datasheet(HTML) 2 Page - STMicroelectronics

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M74HC161
2/12
INPUT AND OUTPUT EQUIVALENT CIRCUIT
PIN DESCRIPTION
TRUTH TABLE
X : Don’t Care
A, B, C, D : Logic level of data inputs
Carry : CARRY = TE·QA·QB·QC·QD
LOGIC DIAGRAM
This logic diagram has not be used to estimate propagation delays
PIN No
SYMBOL
NAME AND FUNCTION
1
CLEAR
Asynchronous Master
Reset
2
CLOCK
Clock Input (LOW to
HIGH, Edge-triggered)
3, 4, 5, 6
A, B, C, D
Data Inputs
7
PE
Count Enable Input
10
TE
Count Enable Carry Input
9LOAD
Parallel Enable Input
14, 13, 12,
11
QA to QD
Flip Flop Outputs
15
CARRY
Terminal Count Output
8
GND
Ground (0V)
16
Vcc
Positive Supply Voltage
INPUTS
OUTPUTS
FUNCTION
CLEAR
LOAD
PE
TE
CLOCK
QA
QB
QC
QD
L
X
X
X
X
L
L
L
L
RESET TO "0"
H
L
X
X
A
B
C
D
PRESET DATA
H
H
X
L
NO CHANGE
NO COUNT
H
H
L
X
NO CHANGE
NO COUNT
H
H
H
H
COUNT UP
COUNT
H
X
X
X
NO CHANGE
NO COUNT


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