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SN74HC258DRE4 Arkusz danych(PDF) 2 Page - Texas Instruments

Numer części SN74HC258DRE4
Szczegółowy opis  QUADRUPLE 2-LINE TO 1-LINE DATA SELECTORS/MULTIPLEXERS WITH 3-STATE OUTPUTS
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SN74HC258DRE4 Arkusz danych(HTML) 2 Page - Texas Instruments

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SN54HC257, SN54HC258, SN74HC257, SN74HC258
QUADRUPLE 2LINE TO 1LINE DATA SELECTORS/MULTIPLEXERS
WITH 3STATE OUTPUTS
SCLS224B − DECEMBER 1982 − REVISED SEPTEMBER 2003
2
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
description/ordering information (continued)
These devices are designed to multiplex signals from 4-bit data sources to 4-output data lines in bus-organized
systems. The 3-state outputs do not load the data lines when the output-enable (G) input is at a high logic level.
To ensure the high-impedance state during power up or power down, G should be tied to VCC through a pullup
resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver.
FUNCTION TABLE
INPUTS
OUTPUT Y
G
A/B
A
B
’HC257
’HC258
H
X
X
X
Z
Z
L
LL
X
L
H
L
LH
X
H
L
L
HX
L
L
H
L
H
X
H
H
L
’HC257 logic diagram (positive logic)
4Y
3Y
2Y
1Y
A/B
G
4B
4A
3B
3A
2B
2A
1B
1A
4
2
3
7
5
6
9
11
10
12
14
13
1
15
Pin numbers shown are for the D, J, N, NS, and PW packages.


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