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M74HC259TTR View Datasheet(PDF) - STMicroelectronics

Part NameDescriptionManufacturer
M74HC259TTR 8 BIT ADDRESSABLE LATCH ST-Microelectronics
STMicroelectronics ST-Microelectronics
M74HC259TTR Datasheet PDF : 13 Pages
1 2 3 4 5 6 7 8 9 10 Next Last
M74HC259
INPUT AND OUTPUT EQUIVALENT CIRCUIT
PIN DESCRIPTION
PIN No
1, 2, 3
4, 5, 6, 7, 9,
10, 11, 12
13
14
15
8
16
SYMBOL NAME AND FUNCTION
A, B, C Address Inputs
Q0 to Q7 Latch Outputs
D
ENABLE
CLEAR
GND
Vcc
Data Input
Latch Enable Input (Active
Low)
Conditional Reset Input
(Low)
Ground (0V)
Positive Supply Voltage
TRUTH TABLE
INPUTS
CLEAR
H
H
ENABLE
L
H
OUTPUTS OF
ADDRESSED LATCH
D
Qi0
EACH OTHER OUTPUT
Qi0
Qi0
L
L
D
L
L
H
L
L
D : The level at the data input
Qi0 : The level before the indicated steady state input conditions where established, (i = 0, 1, ......., 7).
FUNCTION
ADDRESSABLE LATCH
MEMORY
8 LINE DEMULTIPLEXER
CLEAR ALL BITS TO ’L’
SELECT INPUTS
LATCH ADDRESSED
C
B
A
L
L
L
Q0
L
L
H
Q1
L
H
L
Q2
L
H
H
Q3
H
L
L
Q4
H
L
H
Q5
H
H
L
Q6
H
H
H
Q7
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