SDAS124C − APRIL 1982 − REVISED AUGUST 1996
D 3-State Outputs Interface Directly With
A/B
1A
1B
1Y
2A
2B
2Y
GND
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.
1
16
2
15
3
14
4
13
5
12
6
11
7
10
8
9
VCC
OE
4A
4B
4Y
3A
3B
3Y
SN54ALS257A, SN54ALS258A . . . FK PACKAGE
(TOP VIEW)
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.
3
4
2 1 20 19
18
5
17
6
16
7
15
8
14
9 10 11 12 13
4A
4B
NC
4Y
3A
2Y
GND
NC
3Y
3B
1B
1Y
NC
2A
2B
A/B
NC
VCC
OE
D
System Bus
Provide Bus Interface From Multiple
Sources in High-Performance Systems
Package Options Include Plastic
Small-Outline (D) Packages, Ceramic Chip
Carriers (FK), and Standard Plastic (N) and
Ceramic (J) 300-mil DIPs
1A
D
SN54ALS257A, SN54ALS258A . . . J PACKAGE
SN74ALS257A, SN74ALS258A, SN74AS257,
SN74AS258 . . . D OR N PACKAGE
(TOP VIEW)
NC − No internal connection
FUNCTION TABLE
INPUTS
OUTPUT Y
A
B
SN54ALS257A
SN74ALS257A
SN74AS257
X
X
Z
Z
H
DATA
OE
A /B
SN54ALS258A
SN74ALS258A
SN74AS258
H
X
L
L
L
X
L
L
L
H
X
H
L
L
H
X
L
L
H
L
H
X
H
H
L
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.
Copyright 1996, Texas Instruments Incorporated
!"#$% ! & '("") % $& ! *(+, '$% ! -$%).
"!-('%& '! !"# %! &*)' '$% ! & *)" %/) %)"#& ! )0$& &%"(#) %&
&%$ -$"- 1$""$ %2. "!-('% ! *"!')&& 3 -!)& !% )')&&$" ,2 ',(-)
%)&% 3 ! $,, *$"$#)%)"&.
•
POST OFFICE BOX 655303 DALLAS, TEXAS 75265
POST OFFICE BOX 1443 HOUSTON, TEXAS 77251−1443
•
1
SDAS124C − APRIL 1982 − REVISED AUGUST 1996
logic symbols†
SN54ALS257A, SN74ALS257A,
SN74AS257
15
OE
1
A /B
1A
1B
2A
2B
3A
3B
4A
4B
15
EN
OE
G1
A /B
2
3
SN54ALS258A, SN74ALS258A,
SN74AS258
1
MUX
1A
4
1Y
1
1B
5
2A
7
6
2Y
2B
11
3A
9
10
3Y
3B
14
4A
12
13
4Y
4B
EN
1
G1
2
1
3
MUX
4
1
1Y
5
7
6
2Y
11
9
10
3Y
14
12
13
4Y
† 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)
SN54ALS257A, SN74ALS257A,
SN74AS257
OE
A/B
1A
1B
2A
2B
3A
3B
4A
4B
SN54ALS258A, SN74ALS258A,
SN74AS258
15
OE
1
A /B
2
4
1A
1B
5
2A
2B
11
3A
4
3B
14
4A
5
7
4B
11
9
14
12
13
•
POST OFFICE BOX 655303 DALLAS, TEXAS 75265
POST OFFICE BOX 1443 HOUSTON, TEXAS 77251−1443
•
3Y
10
Pin numbers shown are for the D, J, and N packages.
2
2Y
6
4Y
13
1Y
3
3Y
10
12
2
2Y
6
9
1
1Y
3
7
15
4Y
SDAS124C − APRIL 1982 − REVISED AUGUST 1996
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 = 55°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 . . . . . . . . . . . . . . −55°C to 125°C
SN74ALS257A, SN74ALS258A . . . . . . . . . . . . . . . . . 0°C to 70°C
Storage temperature range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −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
4.5
5
5.5
4.5
5
5.5
VCC
VIH
Supply voltage
VIL
IOH
Low-level input voltage
0.7
0.8
V
High-level output current
−1
−2.6
mA
IOL
TA
Low-level output current
12
24
mA
70
°C
High-level input voltage
2
Operating free-air temperature
−55
•
POST OFFICE BOX 655303 DALLAS, TEXAS 75265
POST OFFICE BOX 1443 HOUSTON, TEXAS 77251−1443
•
2
125
0
V
V
3
SDAS124C − APRIL 1982 − REVISED AUGUST 1996
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER
SN54ALS257A
SN54ALS258A
TEST CONDITIONS
MIN
VIK
VCC = 4.5 V,
VCC = 4.5 V to 5.5 V,
II = −18 mA
IOH = −0.4 mA
VCC = 4.5 V
IOH = −1 mA
IOH = −2.6 mA
VOH
VCC = 4.5 V
IOL = 12 mA
IOL = 24 mA
IOZH
IOZL
VCC = 5.5 V,
VCC = 5.5 V,
VO = 2.7 V
VO = 0.4 V
II
IIH
VCC = 5.5 V,
VCC = 5.5 V,
VI = 7 V
VI = 2.7 V
IIL
IO‡
VCC = 5.5 V,
VCC = 5.5 V,
VI = 0.4 V
VO = 2.25 V
VOH
SN54ALS257A,
SN74ALS257A
VCC = 5.5 V
TYP†
VCC−2
2.4
VCC = 5.5 V
TYP†
MIN
UNIT
MAX
−1.5
V
VCC−2
3.3
V
2.4
0.25
−20
3.2
0.4
0.25
0.4
0.35
0.5
µA
20
−20
−20
µA
0.1
0.1
mA
20
20
µA
−0.1
−0.1
mA
−112
mA
−112
−30
3
8
3
6
Outputs low
8
12
8
12
9
14
9
14
2.5
5
2.5
4
7
11
7
11
Outputs low
V
20
Outputs high
Outputs high
SN54ALS258A,
SN74ALS258A
MAX
−1.5
Outputs disabled
ICC
SN74ALS257A
SN74ALS258A
mA
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§
SN54ALS257A
tPLH
tPHL
A or B
Any Y
tPLH
tPHL
A /B
Any Y
tPZH
tPZL
OE
Any Y
tPHZ
tPLZ
OE
Any Y
SN74ALS257A
MIN
MAX
MIN
MAX
2
12
2
10
2
14
2
12
4
21
6
18
6
25
6
22
3
20
4
16
4
22
5
18
2
12
2
10
2
35
4
15
§ For conditions shown MIN or MAX, use the appropriate value specified under recommended operating conditions.
4
•
POST OFFICE BOX 655303 DALLAS, TEXAS 75265
POST OFFICE BOX 1443 HOUSTON, TEXAS 77251−1443
•
UNIT
ns
ns
ns
ns
SDAS124C − APRIL 1982 − REVISED AUGUST 1996
switching characteristics (see Figure 1)
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
tPLH
tPHL
A or B
Any Y
tPLH
tPHL
A /B
Any Y
tPZH
tPZL
OE
Any Y
tPHZ
tPLZ
OE
Any Y
VCC = 4.5 V to 5.5 V,
CL = 50 pF,
R1 = 500 Ω,
R2 = 500 Ω,
TA = MIN to MAX†
SN54ALS258A SN74ALS258A
MIN
MAX
MIN
MAX
1
12
2
8
2
9
2
7
4
28
5
25
5
25
6
20
3
20
4
18
5
21
5
18
2
12
2
10
3
37
4
18
UNIT
ns
ns
ns
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, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V
Input voltage, VI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V
Voltage applied to a disabled 3-state output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.5 V
Maximum power dissipation at TA = 55°C (in still air) (see Note 1): D package . . . . . . . . . . . . . . . . . . . 1.3 W
N package . . . . . . . . . . . . . . . . . . . 1.1 W
Operating free-air temperature range, TA: SN74AS257, SN74AS258 . . . . . . . . . . . . . . . . . . . . . . 0°C to 70°C
Storage temperature range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −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
4.5
5
5.5
VCC
VIH
Supply voltage
VIL
IOH
Low-level input voltage
0.8
V
High-level output current
−15
mA
IOL
TA
Low-level output current
48
mA
70
°C
High-level input voltage
2
Operating free-air temperature
0
•
POST OFFICE BOX 655303 DALLAS, TEXAS 75265
POST OFFICE BOX 1443 HOUSTON, TEXAS 77251−1443
•
V
V
5
SDAS124C − APRIL 1982 − REVISED AUGUST 1996
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER
TEST CONDITIONS
SN74AS257
SN74AS258
MIN
VIK
VOH
VOL
IOZH
IOZL
VCC = 4.5 V,
VCC = 4.5 V to 5.5 V,
II = −18 mA
IOH = −2 mA
VCC = 4.5 V,
VCC = 4.5 V,
IOH = −15 mA
IOL = 48 mA
VCC = 5.5 V,
VCC = 5.5 V,
VO = 2.7 V
VO = 0.4 V
VCC = 5.5 V,
VI = 7 V
VCC = 5.5 V,
VI = 2.7 V
VCC = 5.5 V,
VI = 0.4 V
VCC = 5.5 V,
VO = 2.25 V
Outputs high
VCC = 5.5 V
Outputs low
TYP†
−1.2
VCC −2
2.4
0.35
A/B
A/B
A/B
IO‡
SN74AS257
50
µA
−50
µA
20
40
mA
µA
A
−0.5
ICC
VCC = 5.5 V
−1
−30
−112
12.1
19.7
19
30.6
19.7
31.9
Outputs high
8.4
13.5
Outputs low
15.2
24.6
Outputs disabled
15.5
Outputs disabled
SN74AS258
V
0.2
A, B, or OE
IIL
0.5
0.1
A, B, or OE
IIH
V
V
3.2
A, B, or OE
II
UNIT
MAX
mA
mA
mA
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.
6
•
POST OFFICE BOX 655303 DALLAS, TEXAS 75265
POST OFFICE BOX 1443 HOUSTON, TEXAS 77251−1443
•
SDAS124C − APRIL 1982 − REVISED AUGUST 1996
switching characteristics (see Figure 1)
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
tPLH
tPHL
A or B
Any Y
tPLH
tPHL
A /B
Any Y
tPZH
tPZL
OE
Any Y
tPHZ
tPLZ
OE
Any Y
VCC = 4.5 V to 5.5 V,
CL = 50 pF,
R1 = 500 Ω,
R2 = 500 Ω,
TA = MIN to MAX†
SN74AS257
MIN
MAX
1
5.5
1
6
2
11
2
10
2
7.5
2
9.5
1.5
6.5
2
7
UNIT
ns
ns
ns
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
tPLH
tPHL
A or B
Any Y
tPLH
tPHL
A /B
Any Y
tPZH
tPZL
OE
Any Y
tPHZ
tPLZ
OE
Any Y
MIN
MAX
1
5
1
4
2
9.5
2
10
2
8
2
10
1.5
6
2
6.5
ns
ns
ns
ns
† For conditions shown MIN or MAX, use the appropriate value specified under recommended operating conditions.
•
POST OFFICE BOX 655303 DALLAS, TEXAS 75265
POST OFFICE BOX 1443 HOUSTON, TEXAS 77251−1443
•
7
SDAS124C − APRIL 1982 − REVISED AUGUST 1996
PARAMETER MEASUREMENT INFORMATION
SERIES 54ALS/74ALS AND 54AS/74AS DEVICES
7V
RL = R1 = R2
S1
R1
CL
(see Note A)
3.5 V
High-Level
Pulse
Test
Point
From Output
Under Test
1.3 V
0.3 V
tw
R2
3.5 V
Low-Level
Pulse
1.3 V
1.3 V
0.3 V
LOAD CIRCUIT
FOR 3-STATE OUTPUTS
VOLTAGE WAVEFORMS
PULSE DURATIONS
3.5 V
Output
Control
(low-level
enabling)
1.3 V
1.3 V
0.3 V
tPZL
Waveform 1
S1 Closed
(see Note B)
tPLZ
3.5 V
Input
1.3 V
1.3 V
0.3 V
tPHL
[3.5 V
tPLH
1.3 V
tPHZ
tPZH
Waveform 2
S1 Open
(see Note B)
1.3 V
1.3 V
1.3 V
VOL
tPLH
tPHL
VOH
1.3 V
VOH
In-Phase
Output
VOL
0.3 V
VOH
Out-of-Phase
Output
(see Note C)
0.3 V
[0 V
1.3 V
1.3 V
VOL
VOLTAGE WAVEFORMS
PROPAGATION DELAY TIMES
VOLTAGE WAVEFORMS
ENABLE AND DISABLE TIMES, 3-STATE OUTPUTS
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
8
•
POST OFFICE BOX 655303 DALLAS, TEXAS 75265
POST OFFICE BOX 1443 HOUSTON, TEXAS 77251−1443
•
PACKAGE OPTION ADDENDUM
www.ti.com
14-Oct-2022
PACKAGING INFORMATION
Orderable Device
Status
(1)
Package Type Package Pins Package
Drawing
Qty
Eco Plan
(2)
Lead finish/
Ball material
MSL Peak Temp
Op Temp (°C)
Device Marking
(3)
Samples
(4/5)
(6)
5962-8862601EA
ACTIVE
CDIP
J
16
1
Non-RoHS
& Green
SNPB
N / A for Pkg Type
-55 to 125
5962-8862601EA
SNJ54ALS258AJ
85097012A
ACTIVE
LCCC
FK
20
1
Non-RoHS
& Green
SNPB
N / A for Pkg Type
-55 to 125
85097012A
SNJ54ALS
257AFK
8509701EA
ACTIVE
CDIP
J
16
1
Non-RoHS
& Green
SNPB
N / A for Pkg Type
-55 to 125
8509701EA
SNJ54ALS257AJ
Samples
SN74ALS257AD
ACTIVE
SOIC
D
16
40
RoHS & Green
NIPDAU
Level-1-260C-UNLIM
0 to 70
ALS257A
Samples
SN74ALS257ADG4
ACTIVE
SOIC
D
16
40
RoHS & Green
NIPDAU
Level-1-260C-UNLIM
0 to 70
ALS257A
Samples
SN74ALS257ADR
ACTIVE
SOIC
D
16
2500
RoHS & Green
NIPDAU
Level-1-260C-UNLIM
0 to 70
ALS257A
Samples
SN74ALS257AN
ACTIVE
PDIP
N
16
25
RoHS & Green
NIPDAU
N / A for Pkg Type
0 to 70
SN74ALS257AN
Samples
SN74ALS257ANSR
ACTIVE
SO
NS
16
2000
RoHS & Green
NIPDAU
Level-1-260C-UNLIM
0 to 70
ALS257A
Samples
SN74ALS258AN
ACTIVE
PDIP
N
16
25
RoHS & Green
NIPDAU
N / A for Pkg Type
0 to 70
SN74ALS258AN
Samples
SN74AS257D
ACTIVE
SOIC
D
16
40
RoHS & Green
NIPDAU
Level-1-260C-UNLIM
0 to 70
AS257
Samples
SN74AS257N
ACTIVE
PDIP
N
16
25
RoHS & Green
NIPDAU
N / A for Pkg Type
0 to 70
SN74AS257N
Samples
SN74AS257NSR
ACTIVE
SO
NS
16
2000
RoHS & Green
NIPDAU
Level-1-260C-UNLIM
0 to 70
74AS257
Samples
SN74AS258N
ACTIVE
PDIP
N
16
25
RoHS & Green
NIPDAU
N / A for Pkg Type
0 to 70
SN74AS258N
Samples
SNJ54ALS257AFK
ACTIVE
LCCC
FK
20
1
Non-RoHS
& Green
SNPB
N / A for Pkg Type
-55 to 125
85097012A
SNJ54ALS
257AFK
SNJ54ALS257AJ
ACTIVE
CDIP
J
16
1
Non-RoHS
& Green
SNPB
N / A for Pkg Type
-55 to 125
8509701EA
SNJ54ALS257AJ
Samples
SNJ54ALS258AJ
ACTIVE
CDIP
J
16
1
Non-RoHS
& Green
SNPB
N / A for Pkg Type
-55 to 125
5962-8862601EA
SNJ54ALS258AJ
Samples
(1)
The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
Addendum-Page 1
Samples
Samples
Samples
PACKAGE OPTION ADDENDUM
www.ti.com
14-Oct-2022
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2)
RoHS: TI defines "RoHS" to mean semiconductor products that are compliant with the current EU RoHS requirements for all 10 RoHS substances, including the requirement that RoHS substance
do not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, "RoHS" products are suitable for use in specified lead-free processes. TI may
reference these types of products as "Pb-Free".
RoHS Exempt: TI defines "RoHS Exempt" to mean products that contain lead but are compliant with EU RoHS pursuant to a specific EU RoHS exemption.
Green: TI defines "Green" to mean the content of Chlorine (Cl) and Bromine (Br) based flame retardants meet JS709B low halogen requirements of
工商网监
湘ICP备2023018690号
