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74ACT161M Datasheet(Hoja de datos) 2 Page - STMicroelectronics

No. de Pieza. 74ACT161M
Descripción  SYNCHRONOUS PRESETTABLE 4-BIT COUNTER
Descarga  13 Pages
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Fabricante  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
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 2 page
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74ACT161
2/13
INPUT AND OUTPUT EQUIVALENT CIRCUIT
PIN DESCRIPTION
TRUTH TABLE
X : Don’t Care; A, B, C, D; Logic level of data input; CARRY OUT : TE x QA x QB x QC x QD
LOGIC DIAGRAM
PIN No
SYMBOL
NAME QND FUNCTION
1CLEAR
Master Reset
2
CLOCK
Clock Input (LOW to
HIGH Edge Trigger)
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 toQD
Flip-Flop Outputs
15
CARRY OUT Terminal Count Output
8
GND
Ground (0V)
16
VCC
Positive Supply Voltage
INPUTS
OUTPUTS
FUNCTION
CLEAR
LOAD
PE
TE
CLOCK
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
HHHH
COUNT UP
COUNT
H
X
X
X
NO CHANGE
NO COUNT




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