Texas Instruments SN74ALS257AN Manual

Texas Instruments Ikke kategoriseret SN74ALS257AN

Læs gratis den danske manual til Texas Instruments SN74ALS257AN (24 sider) i kategorien Ikke kategoriseret. Denne vejledning er vurderet som hjælpsom af 18 personer og har en gennemsnitlig bedømmelse på 4.4 stjerner ud af 9.5 anmeldelser. Har du et spørgsmål om Texas Instruments SN74ALS257AN, eller vil du spørge andre brugere om produktet?

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     
    
  
SDAS124C − APRIL 1982 − REVISED AUGUST 1996
1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
POST OFFICE BOX 1443
• HOUSTON, TEXAS 77251−1443
D3-State Outputs Interface Directly With
System Bus
DProvide Bus Interface From Multiple
Sources in High-Performance Systems
DPackage Options Include Plastic
Small-Outline (D) Packages, Ceramic Chip
Carriers (FK), and Standard Plastic (N) and
Ceramic (J) 300-mil DIPs
description
These data selectors/multiplexers 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 a high logic level.
The SN54ALS257A and SN54ALS258A are
characterized for operation over the full military
temperature range of −55°C to 125°C. The
SN74ALS257A, SN74ALS258A, SN74AS257,
and SN74AS258 are characterized for operation
from 0°C to 70°C.
FUNCTION TABLE
INPUTS OUTPUT Y
OE
A /B
DATA SN54ALS257A
SN74ALS257A
SN54ALS258A
SN74ALS258A
OE A /B A B
SN74ALS257A
SN74AS257
SN74ALS258A
SN74AS258
H X X X Z Z
L L L X L H
L L H X H L
L HH X L L
L H X H H L
Copyright 1996, Texas Instruments Incorporated
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%)&%3 ! $,, *$"$#)%)"&.
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
SN54ALS257A, SN54ALS258A . . . J PACKAGE
SN74ALS257A, SN74ALS258A, SN74AS257,
SN74AS258 . . . D OR N PACKAGE
(TOP VIEW)
SN54ALS257A, SN54ALS258A . . . FK PACKAGE
(TOP VIEW)
NC − No internal connection
3 2 1 20 19
9 10 11 12 13
4
5
6
7
8
18
17
16
15
14
4A
4B
NC
4Y
3A
1B
1Y
NC
2A
2B
1A
A/B
NC
3Y
3B OE
2Y
GND
NC
VCC
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.
     
    
  
SDAS124C − APRIL 1982 − REVISED AUGUST 1996
2POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251−1443
logic symbols†
OE
MUX
2
1A
1
3
1B
EN
15
G1
1
1Y
4
5
2A
6
2B 2Y
7
11
3A 10
3B 3Y
9
14
4A 13
4B 4Y
12
A /B
1
OE
MUX
2
1A
1
3
1B
EN
15
G1
1
1Y
4
5
2A
6
2B 2Y
7
11
3A 10
3B 3Y
9
14
4A 13
4B 4Y
12
A /B
1
SN54ALS257A, SN74ALS257A,
SN74AS257
SN54ALS258A, SN74ALS258A,
SN74AS258
†These symbols are in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12.
Pin numbers shown are for the D, J, and N packages.
logic diagrams (positive logic)
4Y
3Y
2Y
1Y
A/B
OE
4B
4A
3B
3A
2B
2A
1B
1A 4
2
3
7
5
6
9
11
10
12
14
13
1
15
4
Y
3
Y
2
Y
1
Y
A /B
OE
4B
4A
3B
3A
2B
2A
1B
1A 4
2
3
7
5
6
9
11
10
12
14
13
1
15
SN54ALS257A, SN74ALS257A,
SN74AS257
SN54ALS258A, SN74ALS258A,
SN74AS258
Pin numbers shown are for the D, J, and N packages.

Produkt Specifikationer

Mærke: Texas Instruments
Kategori: Ikke kategoriseret
Model: SN74ALS257AN

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