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SN74AHCT257 Scheda tecnica(PDF) 1 Page - Texas Instruments

Il numero della parte SN74AHCT257
Spiegazioni elettronici  QUADRUPLE 2-LINE TO 1-LINE DATA SELECTORS/MULTIPLEXERS WITH 3-STATE OUTPUTS
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SN74AHCT257 Scheda tecnica(HTML) 1 Page - Texas Instruments

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SN54AHCT257, SN74AHCT257
QUADRUPLE 2-LINE TO 1-LINE DATA SELECTORS/MULTIPLEXERS
WITH 3-STATE OUTPUTS
SCLS351E – MAY 1996 – REVISED OCTOBER 1998
1
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
D Inputs Are TTL-Voltage Compatible
D EPIC™ (Enhanced-Performance Implanted
CMOS) Process
D Package Options Include Plastic
Small-Outline (D), Shrink Small-Outline
(DB), Thin Very Small-Outline (DGV), Thin
Shrink Small-Outline (PW), and Ceramic
Flat (W) Packages, Ceramic Chip Carriers
(FK), and Standard Plastic (N) and Ceramic
(J) DIPs
description
These
quadruple
2-line
to
1-line
data
selectors/multiplexers are designed for 4.5-V to
5.5-V VCC operation.
The ’AHCT257 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 (OE) input is at the high logic level.
To ensure the high-impedance state during power
up or power down, OE 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.
The
SN54AHCT257
is
characterized
for
operation over the full military temperature range
of –55
°C to 125°C. The SN74AHCT257 is
characterized for operation from –40
°C to 85°C.
FUNCTION TABLE
INPUTS
OUTPUT
OE
A/B
A
B
Y
H
X
X
X
Z
L
LL
X
L
L
LH
X
H
L
HX
L
L
L
H
X
H
H
Copyright
© 1998, Texas Instruments Incorporated
PRODUCT PREVIEW information concerns products in the formative or
design phase of development. Characteristic data and other
specifications are design goals. Texas Instruments reserves the right to
change or discontinue these products without notice.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
EPIC is a trademark of Texas Instruments Incorporated.
SN54AHCT257 ...J OR W PACKAGE
SN74AHCT257 . . . D, DB, DGV, N, OR PW PACKAGE
(TOP VIEW)
SN54AHCT257 . . . FK PACKAGE
(TOP VIEW)
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
A/B
1A
1B
1Y
2A
2B
2Y
GND
VCC
OE
4A
4B
4Y
3A
3B
3Y
32 1 20 19
910 11 1213
4
5
6
7
8
18
17
16
15
14
4A
4B
NC
4Y
3A
1B
1Y
NC
2A
2B
NC – No internal connection


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