Texas Instruments SN74ALS257AN Manual de Usario

Texas Instruments No categorizado SN74ALS257AN

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ξ˜ξ˜‚ξ˜ƒξ˜„ξ˜…ξ˜†ξ˜ξ˜‡ξ˜ƒξ˜ˆξ˜…ξ˜‰ ξ˜ξ˜‚ξ˜ƒξ˜„ξ˜…ξ˜†ξ˜ξ˜‡ξ˜ƒξ˜Šξ˜…ξ˜‰ ξ˜ξ˜‚ξ˜ˆξ˜„ξ˜…ξ˜†ξ˜ξ˜‡ξ˜ƒξ˜ˆξ˜…ξ˜‰ ξ˜ξ˜‚ξ˜ˆξ˜„ξ˜…ξ˜†ξ˜ξ˜‡ξ˜ƒξ˜Šξ˜…ξ˜‰ ξ˜ξ˜‚ξ˜ˆξ˜„ξ˜…ξ˜ξ˜‡ξ˜ƒξ˜ˆξ˜‰ ξ˜ξ˜‚ξ˜ˆξ˜„ξ˜…ξ˜ξ˜‡ξ˜ƒξ˜Š
ξ˜‹ξ˜Œξ˜…ξ˜ξ˜Žξ˜Œξ˜ξ˜†ξ˜ ξ˜‡ξ˜‘ξ˜†ξ˜’ξ˜‚ξ˜ ξ˜•ξ˜‘ξ˜†ξ˜’ξ˜‚ξ˜ ξ˜ξ˜…ξ˜“ξ˜… ξ˜ξ˜ξ˜†ξ˜ξ˜–ξ˜“ξ˜”ξ˜Žξ˜ξ˜—ξ˜˜ξ˜Œξ˜†ξ˜“ξ˜’ξ˜ξ˜†ξ˜ξ˜™ξ˜ξ˜Žξ˜ξ˜“ξ˜”
ξ˜šξ˜’ξ˜“ξ˜› ξ˜œξ˜‘ξ˜ξ˜“ξ˜…ξ˜“ξ˜ ξ˜”ξ˜Œξ˜“ξ˜ξ˜Œξ˜“ξ˜
SDAS124C βˆ’ APRIL 1982 βˆ’ REVISED AUGUST 1996
1
POST OFFICE BOX 655303 β€’ DALLAS, TEXAS 75265
POST OFFICE BOX 1443
β€’ HOUSTON, TEXAS 77251βˆ’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 βˆ’55Β°C to 125Β°C. The
SN74ALS257A, SN74ALS258A, SN74AS257,
and SN74AS258 are characterized for operation
from 0Β°C to 70Β°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
ξ˜ξ˜Žξ˜”ξ˜ξ˜Œξ˜–ξ˜“ξ˜’ξ˜”ξ˜‚ ξ˜ξ˜…ξ˜“ξ˜… !"#$%! & '("")% $& ! *(+,'$%! -$%).
"!-('%& '!!"# %! &*)''$%!& *)" %/) %)"#& ! ξ˜“)0$& ξ˜’ξ˜ž&%"(#)%&
&%$-$"- 1$""$%2. "!-('%! *"!')&&3 -!)& !% )')&&$",2 ',(-)
%)&%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 βˆ’ 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.
ξ˜ξ˜‚ξ˜ƒξ˜„ξ˜…ξ˜†ξ˜ξ˜‡ξ˜ƒξ˜ˆξ˜…ξ˜‰ ξ˜ξ˜‚ξ˜ƒξ˜„ξ˜…ξ˜†ξ˜ξ˜‡ξ˜ƒξ˜Šξ˜…ξ˜‰ ξ˜ξ˜‚ξ˜ˆξ˜„ξ˜…ξ˜†ξ˜ξ˜‡ξ˜ƒξ˜ˆξ˜…ξ˜‰ ξ˜ξ˜‚ξ˜ˆξ˜„ξ˜…ξ˜†ξ˜ξ˜‡ξ˜ƒξ˜Šξ˜…ξ˜‰ ξ˜ξ˜‚ξ˜ˆξ˜„ξ˜…ξ˜ξ˜‡ξ˜ƒξ˜ˆξ˜‰ ξ˜ξ˜‚ξ˜ˆξ˜„ξ˜…ξ˜ξ˜‡ξ˜ƒξ˜Š
ξ˜‹ξ˜Œξ˜…ξ˜ξ˜Žξ˜Œξ˜ξ˜†ξ˜ ξ˜‡ξ˜‘ξ˜†ξ˜’ξ˜‚ξ˜ ξ˜•ξ˜‘ξ˜†ξ˜’ξ˜‚ξ˜ ξ˜ξ˜…ξ˜“ξ˜… ξ˜ξ˜ξ˜†ξ˜ξ˜–ξ˜“ξ˜”ξ˜Žξ˜ξ˜—ξ˜˜ξ˜Œξ˜†ξ˜“ξ˜’ξ˜ξ˜†ξ˜ξ˜™ξ˜ξ˜Žξ˜ξ˜“ξ˜”
ξ˜šξ˜’ξ˜“ξ˜› ξ˜œξ˜‘ξ˜ξ˜“ξ˜…ξ˜“ξ˜ ξ˜”ξ˜Œξ˜“ξ˜ξ˜Œξ˜“ξ˜
SDAS124C βˆ’ APRIL 1982 βˆ’ REVISED AUGUST 1996
2POST OFFICE BOX 655303 β€’ DALLAS, TEXAS 75265
POST OFFICE BOX 1443 β€’ HOUSTON, TEXAS 77251βˆ’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.
ξ˜ξ˜‚ξ˜ƒξ˜„ξ˜…ξ˜†ξ˜ξ˜‡ξ˜ƒξ˜ˆξ˜…ξ˜‰ ξ˜ξ˜‚ξ˜ƒξ˜„ξ˜…ξ˜†ξ˜ξ˜‡ξ˜ƒξ˜Šξ˜…ξ˜‰ ξ˜ξ˜‚ξ˜ˆξ˜„ξ˜…ξ˜†ξ˜ξ˜‡ξ˜ƒξ˜ˆξ˜…ξ˜‰ ξ˜ξ˜‚ξ˜ˆξ˜„ξ˜…ξ˜†ξ˜ξ˜‡ξ˜ƒξ˜Šξ˜…ξ˜‰ ξ˜ξ˜‚ξ˜ˆξ˜„ξ˜…ξ˜ξ˜‡ξ˜ƒξ˜ˆξ˜‰ ξ˜ξ˜‚ξ˜ˆξ˜„ξ˜…ξ˜ξ˜‡ξ˜ƒξ˜Š
ξ˜‹ξ˜Œξ˜…ξ˜ξ˜Žξ˜Œξ˜ξ˜†ξ˜ ξ˜‡ξ˜‘ξ˜†ξ˜’ξ˜‚ξ˜ ξ˜•ξ˜‘ξ˜†ξ˜’ξ˜‚ξ˜ ξ˜ξ˜…ξ˜“ξ˜… ξ˜ξ˜ξ˜†ξ˜ξ˜–ξ˜“ξ˜”ξ˜Žξ˜ξ˜—ξ˜˜ξ˜Œξ˜†ξ˜“ξ˜’ξ˜ξ˜†ξ˜ξ˜™ξ˜ξ˜Žξ˜ξ˜“ξ˜”
ξ˜šξ˜’ξ˜“ξ˜› ξ˜œξ˜‘ξ˜ξ˜“ξ˜…ξ˜“ξ˜ ξ˜”ξ˜Œξ˜“ξ˜ξ˜Œξ˜“ξ˜
SDAS124C βˆ’ APRIL 1982 βˆ’ REVISED AUGUST 1996
3
POST OFFICE BOX 655303 β€’ DALLAS, TEXAS 75265
POST OFFICE BOX 1443
β€’ HOUSTON, TEXAS 77251βˆ’1443
absolute maximum ratings over operating free-air temperature range (unless otherwise noted) †
Supply voltage, VCC 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input voltage, VI 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Voltage applied to a disabled 3-state output 5.5 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Maximum power dissipation at TA = 55Β°C (in still air) (see Note 1): D package 1.3 W. . . . . . . . . . . . . . . . . . .
N package 1.1 W. . . . . . . . . . . . . . . . . . .
Operating free-air temperature range, TA : SN54ALS257A, SN54ALS258A βˆ’55Β° Β°C to 125 C. . . . . . . . . . . . . .
SN74ALS257A, SN74ALS258A 0Β° Β°C to 70 C. . . . . . . . . . . . . . . . .
Storage temperature range, Tstg βˆ’65Β° Β°C to 150 C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
†Stresses beyond those listed under β€œabsolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under β€œrecommended operating conditions” is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
NOTE 1: The maximum package power dissipation is calculated using a junction temperature of 150Β°C and a board trace length of 750 mils,
except for the N package, which has a trace length of zero.
recommended operating conditions
SN54ALS257A
SN54ALS258A
SN74ALS257A
SN74ALS258A
UNIT
MIN NOM MAX MIN NOM MAX
UNIT
VCC Supply voltage 4.5 5 5.5 4.5 5 5.5 V
VIH High-level input voltage 2 2 V
VIL Low-level input voltage 0.7 0.8 V
IOH High-level output current βˆ’1 βˆ’2.6 mA
IOL Low-level output current 12 24 mA
TA Operating free-air temperature βˆ’55 125 0 70 CΒ°

Especificaciones del producto

Marca: Texas Instruments
CategorΓ­a: No categorizado
Modelo: SN74ALS257AN

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