Texas Instruments SN54ALS257AJ, SN74ALS257AD, SN74ALS257ADR, SN74ALS257AN, SN74ALS258AD Datasheet
...
SN54ALS257A, SN54ALS258A, SN74ALS257A, SN74ALS258A, SN74AS257, SN74AS258
QUADRUPLE 2-LINE TO 1-LINE DATA SELECTORS/MULTIPLEXERS
WITH 3-STATE OUTPUTS
SDAS124C – APRIL 1982 – REVISED AUGUST 1996
1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
D
3-State Outputs Interface Directly With
System Bus
D
Provide Bus Interface From Multiple
Sources in High-Performance Systems
D
Package 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
DATA
SN54ALS257A
SN54ALS258A
OE
A/B
A B
SN74ALS257A
SN74AS257
SN74ALS258A
SN74AS258
H X X X Z Z
L LLXL H
LLHXH L
LHXLL H
LHXHH L
Copyright 1996, Texas Instruments Incorporated
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
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
V
CC
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
3212019
910111213
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
V
CC
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.
SN54ALS257A, SN54ALS258A, SN74ALS257A, SN74ALS258A, SN74AS257, SN74AS258
QUADRUPLE 2-LINE TO 1-LINE DATA SELECTORS/MULTIPLEXERS
WITH 3-STATE OUTPUTS
SDAS124C – APRIL 1982 – REVISED AUGUST 1996
2
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
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
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
SN54ALS257A, SN74ALS257A,
SN74AS257
SN54ALS258A, SN74ALS258A,
SN74AS258
Pin numbers shown are for the D, J, and N packages.
SN54ALS257A, SN54ALS258A, SN74ALS257A, SN74ALS258A, SN74AS257, SN74AS258
QUADRUPLE 2-LINE TO 1-LINE DATA SELECTORS/MULTIPLEXERS
WITH 3-STATE OUTPUTS
SDAS124C – APRIL 1982 – REVISED AUGUST 1996
3
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
†
Supply voltage, V
CC
7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input voltage, V
I
7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Voltage applied to a disabled 3-state output 5.5 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Maximum power dissipation at T
A
= 55°C (in still air) (see Note 1): D package 1.3 W. . . . . . . . . . . . . . . . . . .
N package 1.1 W. . . . . . . . . . . . . . . . . . .
Operating free-air temperature range, T
A
: SN54ALS257A, SN54ALS258A –55°C to 125°C. . . . . . . . . . . . . .
SN74ALS257A, SN74ALS258A 0°C to 70°C. . . . . . . . . . . . . . . . .
Storage temperature range, T
stg
–65°C to 150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
†
Stresses beyond those listed under “absolute 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 “recommended 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 150°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
V
CC
Supply voltage 4.5 5 5.5 4.5 5 5.5 V
V
IH
High-level input voltage 2 2 V
V
IL
Low-level input voltage 0.7 0.8 V
I
OH
High-level output current –1 –2.6 mA
I
OL
Low-level output current 12 24 mA
T
A
Operating free-air temperature –55 125 0 70 °C
SN54ALS257A, SN54ALS258A, SN74ALS257A, SN74ALS258A, SN74AS257, SN74AS258
QUADRUPLE 2-LINE TO 1-LINE DATA SELECTORS/MULTIPLEXERS
WITH 3-STATE OUTPUTS
SDAS124C – APRIL 1982 – REVISED AUGUST 1996
4
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER TEST CONDITIONS
SN54ALS257A
SN54ALS258A
SN74ALS257A
SN74ALS258A
UNIT
MIN TYP†MAX MIN TYP†MAX
V
IK
VCC = 4.5 V, II = –18 mA –1.5 –1.5 V
VCC = 4.5 V to 5.5 V, IOH = –0.4 mA VCC–2 VCC–2
V
OH
IOH = –1 mA 2.4 3.3
V
V
CC
= 4.5
V
IOH = –2.6 mA 2.4 3.2
IOL = 12 mA 0.25 0.4 0.25 0.4
VOHV
CC
=
4.5 V
IOL = 24 mA 0.35 0.5
V
I
OZH
VCC = 5.5 V, VO = 2.7 V 20 20 µA
I
OZL
VCC = 5.5 V, VO = 0.4 V –20 –20 µA
I
I
VCC = 5.5 V, VI = 7 V 0.1 0.1 mA
I
IH
VCC = 5.5 V, VI = 2.7 V 20 20 µA
I
IL
VCC = 5.5 V, VI = 0.4 V –0.1 –0.1 mA
I
O
‡
VCC = 5.5 V, VO = 2.25 V –20 –112 –30 –112 mA
Outputs high 3 8 3 6
SN54ALS257A,
VCC = 5.5 V
Outputs low 8 12 8 12
SN74ALS257A
Outputs disabled 9 14 9 14
I
CC
Outputs high 2.5 5 2.5 4
mA
SN54ALS258A
,
VCC = 5.5 V
Outputs low 7 11 7 11
SN74ALS258A
Outputs disabled 8 13 8 13
†
All typical values are at VCC = 5 V, TA = 25°C.
‡
The output conditions have been chosen to produce a current that closely approximates one half of the true short-circuit output current, IOS.
switching characteristics (see Figure 1)
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
VCC = 4.5 V to 5.5 V,
CL = 50 pF,
R1 = 500 Ω,
R2 = 500 Ω,
TA = MIN to MAX
§
UNIT
SN54ALS257A SN74ALS257A
MIN MAX MIN MAX
t
PLH
2 12 2 10
t
PHL
A or B
Any Y
2 14 2 12
ns
t
PLH
4 21 6 18
t
PHL
A/B
Any Y
6 25 6 22
ns
t
PZH
3 20 4 16
t
PZL
OE
Any Y
4 22 5 18
ns
t
PHZ
2 12 2 10
t
PLZ
OE
Any Y
2 35 4 15
ns
§
For conditions shown MIN or MAX, use the appropriate value specified under recommended operating conditions.
SN54ALS257A, SN54ALS258A, SN74ALS257A, SN74ALS258A, SN74AS257, SN74AS258
QUADRUPLE 2-LINE TO 1-LINE DATA SELECTORS/MULTIPLEXERS
WITH 3-STATE OUTPUTS
SDAS124C – APRIL 1982 – REVISED AUGUST 1996
5
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
switching characteristics (see Figure 1)
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
VCC = 4.5 V to 5.5 V,
CL = 50 pF,
R1 = 500 Ω,
R2 = 500 Ω,
TA = MIN to MAX
†
UNIT
SN54ALS258A SN74ALS258A
MIN MAX MIN MAX
t
PLH
1 12 2 8
t
PHL
A or B
Any Y
2 9 2 7
ns
t
PLH
4 28 5 25
t
PHL
A/B
Any Y
5 25 6 20
ns
t
PZH
3 20 4 18
t
PZL
OE
Any Y
5 21 5 18
ns
t
PHZ
2 12 2 10
t
PLZ
OE
Any Y
3 37 4 18
ns
†
For conditions shown MIN or MAX, use the appropriate value specified under recommended operating conditions.
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
‡
Supply voltage, V
CC
7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input voltage, V
I
7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Voltage applied to a disabled 3-state output 5.5 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Maximum power dissipation at T
A
= 55°C (in still air) (see Note 1): D package 1.3 W. . . . . . . . . . . . . . . . . . .
N package 1.1 W. . . . . . . . . . . . . . . . . . .
Operating free-air temperature range, T
A
: SN74AS257, SN74AS258 0°C to 70°C. . . . . . . . . . . . . . . . . . . . . .
Storage temperature range, T
stg
–65°C to 150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
‡
Stresses beyond those listed under “absolute 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 “recommended 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 150°C and a board trace length of 750 mils,
except for the N package, which has a trace length of zero.
recommended operating conditions
SN74AS257
SN74AS258
UNIT
MIN NOM MAX
V
CC
Supply voltage 4.5 5 5.5 V
V
IH
High-level input voltage 2 V
V
IL
Low-level input voltage 0.8 V
I
OH
High-level output current –15 mA
I
OL
Low-level output current 48 mA
T
A
Operating free-air temperature 0 70 °C
SN54ALS257A, SN54ALS258A, SN74ALS257A, SN74ALS258A, SN74AS257, SN74AS258
QUADRUPLE 2-LINE TO 1-LINE DATA SELECTORS/MULTIPLEXERS
WITH 3-STATE OUTPUTS
SDAS124C – APRIL 1982 – REVISED AUGUST 1996
6
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER TEST CONDITIONS
SN74AS257
SN74AS258
UNIT
MIN TYP†MAX
V
IK
VCC = 4.5 V, II = –18 mA –1.2 V
VCC = 4.5 V to 5.5 V, IOH = –2 mA VCC–2
V
OH
VCC = 4.5 V, IOH = –15 mA 2.4 3.2
V
V
OL
VCC = 4.5 V, IOL = 48 mA 0.35 0.5 V
I
OZH
VCC = 5.5 V, VO = 2.7 V 50 µA
I
OZL
VCC = 5.5 V, VO = 0.4 V –50 µA
A, B, or OE
0.1
I
I
A/B
V
CC
= 5.5 V,
V
I
= 7
V
0.2
mA
A, B, or OE
20
I
IH
A/B
V
CC
=
5.5 V
,
V
I
=
2.7 V
40
µ
A
A, B, or OE
–0.5
I
IL
A/B
V
CC
=
5.5 V
,
V
I
=
0.4 V
–1
mA
I
O
‡
VCC = 5.5 V, VO = 2.25 V –30 –112 mA
Outputs high 12.1 19.7
SN74AS257 VCC = 5.5 V
Outputs low 19 30.6
Outputs disabled 19.7 31.9
I
CC
Outputs high 8.4 13.5
mA
SN74AS258 VCC = 5.5 V
Outputs low 15.2 24.6
Outputs disabled 15.5 25.2
†
All typical values are at VCC = 5 V, TA = 25°C.
‡
The output conditions have been chosen to produce a current that closely approximates one half of the true short-circuit output current, IOS.
SN54ALS257A, SN54ALS258A, SN74ALS257A, SN74ALS258A, SN74AS257, SN74AS258
QUADRUPLE 2-LINE TO 1-LINE DATA SELECTORS/MULTIPLEXERS
WITH 3-STATE OUTPUTS
SDAS124C – APRIL 1982 – REVISED AUGUST 1996
7
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
switching characteristics (see Figure 1)
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
VCC = 4.5 V to 5.5 V,
CL = 50 pF,
R1 = 500 Ω,
R2 = 500 Ω,
TA = MIN to MAX
†
UNIT
SN74AS257
MIN MAX
t
PLH
1 5.5
t
PHL
A or B
Any Y
1 6
ns
t
PLH
2 11
t
PHL
A/B
Any Y
2 10
ns
t
PZH
2 7.5
t
PZL
OE
Any Y
2 9.5
ns
t
PHZ
1.5 6.5
t
PLZ
OE
Any Y
2 7
ns
switching characteristics (see Figure 1)
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
VCC = 4.5 V to 5.5 V,
CL = 50 pF,
R1 = 500 Ω,
R2 = 500 Ω,
TA = MIN to MAX
†
UNIT
SN74AS258
MIN MAX
t
PLH
1 5
t
PHL
A or B
Any Y
1 4
ns
t
PLH
2 9.5
t
PHL
A/B
Any Y
2 10
ns
t
PZH
2 8
t
PZL
OE
Any Y
2 10
ns
t
PHZ
1.5 6
t
PLZ
OE
Any Y
2 6.5
ns
†
For conditions shown MIN or MAX, use the appropriate value specified under recommended operating conditions.
SN54ALS257A, SN54ALS258A, SN74ALS257A, SN74ALS258A, SN74AS257, SN74AS258
QUADRUPLE 2-LINE TO 1-LINE DATA SELECTORS/MULTIPLEXERS
WITH 3-STATE OUTPUTS
SDAS124C – APRIL 1982 – REVISED AUGUST 1996
8
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
PARAMETER MEASUREMENT INFORMATION
SERIES 54ALS/74ALS AND 54AS/74AS DEVICES
t
PHZ
t
PLZ
t
PHL
t
PLH
0.3 V
t
PZL
t
PZH
t
PLH
t
PHL
LOAD CIRCUIT
FOR 3-STATE OUTPUTS
From Output
Under Test
Test
Point
R1
S1
C
L
(see Note A)
7 V
1.3 V 1.3 V
3.5 V
3.5 V
0.3 V
0.3 V
High-Level
Pulse
Low-Level
Pulse
t
w
VOLTAGE WAVEFORMS
PULSE DURATIONS
Input
Out-of-Phase
Output
(see Note C)
1.3 V 1.3 V
1.3 V1.3 V
1.3 V 1.3 V
1.3 V1.3 V
1.3 V
1.3 V
3.5 V
3.5 V
0.3 V
0.3 V
V
OL
V
OH
V
OH
V
OL
Output
Control
(low-level
enabling)
Waveform 1
S1 Closed
(see Note B)
Waveform 2
S1 Open
(see Note B)
[
0 V
V
OH
V
OL
[
3.5 V
In-Phase
Output
0.3 V
1.3 V 1.3 V
VOLTAGE WAVEFORMS
PROPAGATION DELAY TIMES
VOLTAGE WAVEFORMS
ENABLE AND DISABLE TIMES, 3-STATE OUTPUTS
R2
RL = R1 = R2
NOTES: A. CL includes probe and jig capacitance.
B. Waveform 1 is for an output with internal conditions such that the output is low except when disabled by the output control.
Waveform 2 is for an output with internal conditions such that the output is high except when disabled by the output control.
C. When measuring propagation delay items of 3-state outputs, switch S1 is open.
D. All input pulses have the following characteristics: PRR ≤ 1 MHz, tr = tf = 2 ns, duty cycle = 50%.
E. The outputs are measured one at a time with one transition per measurement.
Figure 1. Load Circuits and Voltage Waveforms
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pertaining to warranty, patent infringement, and limitation of liability.
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accordance with TI’s standard warranty. Testing and other quality control techniques are utilized to the extent
TI deems necessary to support this warranty. Specific testing of all parameters of each device is not necessarily
performed, except those mandated by government requirements.
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DEATH, PERSONAL INJURY, OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE (“CRITICAL
APPLICATIONS”). TI SEMICONDUCTOR PRODUCTS ARE NOT DESIGNED, AUTHORIZED, OR
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In order to minimize risks associated with the customer’s applications, adequate design and operating
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Copyright 1998, Texas Instruments Incorporated
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