Philips
Semiconductors
74ALS257/74ALS258
Data selector/multiplexer
Product specification
IC05 Data Handbook
1991 Feb 08
INTEGRATED CIRCUITS
Philips Semiconductors
Product specification
74ALS257/74ALS258
Data selector/multiplexer
74ALS257
Quad 2-input data selector, non-inverting (3-State)
74ALS258
Quad 2-input data selector, inverting (3-State)
2
1991 Feb 08
8531130 01670
DESCRIPTION
The 74ALS257 is a quad 2-input multiplexer which selects 4 bits of
data from one of two sources under the control of a common select
input (S). The output enable input (OE) is active when Low. When
OE is High, all of the outputs (Yn) are forced to a High impedance
state (3-State) regardless of all other input conditions.
Moving data from two registers to a common output bus is a typical
use of the 74ALS257. The state of the select input determines the
particular register from which data comes.
The device is the logic implementation of 4-pole, 2-position switch
where the position of the switch is determined by the logic levels
supplied to the select input. The 74ALS258 is similar but has
inverting outputs (Yn).
TYPE
TYPICAL
PROPAGATION DELAY
TYPICAL
SUPPLY CURRENT
(TOTAL)
74ALS257
7.0ns
7mA
74ALS258
7.0ns
7mA
ORDERING INFORMATION
ORDER CODE
DESCRIPTION
COMMERCIAL RANGE
V
CC
= 5V
10%,
T
amb
= 0
C to +70
C
DRAWING
NUMBER
16-pin plastic DIP
74ALS257N, 74ALS258
SOT38-4
16-pin plastic SO
74ALS257D, 74ALS258D
SOT109-1
16-pin plastic SSOP
Type II
74ALS257DB, 74ALS258DB
SOT338-1
INPUT AND OUTPUT LOADING AND FAN-OUT TABLE
PINS
DESCRIPTION
74ALS (U.L.)
HIGH/LOW
LOAD VALUE
HIGH/LOW
Ina, Inb, Inc, Ind
Data inputs
1.0/1.0
20
A/0.1mA
S
Select input
1.0/1.0
20
A/0.1mA
OE
Enable input
1.0/1.0
20
A/0.1mA
Ya Yd, Ya Yd
Data outputs
20/240
0.4mA/24mA
NOTE:
One (1.0) ALS unit load is defined as: 20
A in the High state and 0.1mA in the Low state.
PIN CONFIGURATION 74ALS257
16
15
14
13
12
11
10
7
6
5
4
3
2
1
Yb
V
CC
Yd
I0c
I1c
I1d
OE
I0d
S
I0a
I1b
I1a
Ya
I0b
9
8
GND
Yc
SF00673
PIN CONFIGURATION 74ALS258
16
15
14
13
12
11
10
7
6
5
4
3
2
1
Yb
V
CC
Yd
I0c
I1c
I1d
OE
I0d
S
I0a
I1b
I1a
Ya
I0b
9
8
GND
Yc
SC00079
Philips Semiconductors
Product specification
74ALS257/74ALS258
Data selector/multiplexer
1991 Feb 08
3
LOGIC SYMBOL 74ALS257
V
CC
= Pin 16
GND = Pin 8
SF00674
1
15
S
OE
2
3
5
6
11
10
14
I0a
I1a
I0b
I1b
I0c
I1c
I0d
Ya
Yb
Yc
Yd
4
7
9
12
13
I1d
LOGIC SYMBOL 74ALS258
V
CC
= Pin 16
GND = Pin 8
SC00080
1
15
S
OE
2
3
5
6
11
10
14
I0a
I1a
I0b
I1b
I0c
I1c
I0d
Ya
Yb
Yc
Yd
4
7
9
12
13
I1d
IEC/IEEE SYMBOL 74ALS257
SF00675
2
1
15
EN
1
G1
3
4
1
MUX
5
6
7
10
11
9
13
14
12
IEC/IEEE SYMBOL 74ALS258
SC00081
2
1
15
EN
1
G1
3
4
1
MUX
5
6
7
10
11
9
13
14
12
LOGIC DIAGRAM 74ALS257
OE
I0a
I1a
I0b
I1b
I0c
I1c
I0d
I1d
S
15
2
3
5
6
11
10
14
13
1
Ya
Yb
Yc
Yd
4
7
9
12
V
CC
= Pin 16
GND = Pin 8
SC00082
LOGIC DIAGRAM 74ALS258
OE
I0a
I1a
I0b
I1b
I0c
I1c
I0d
I1d
S
15
2
3
5
6
11
10
14
13
1
Ya
Yb
Yc
Yd
4
7
9
12
V
CC
= Pin 16
GND = Pin 8
SC00083
Philips Semiconductors
Product specification
74ALS257/74ALS258
Data selector/multiplexer
1991 Feb 08
4
FUNCTION TABLE 74ALS257
INPUTS
OUTPUT
OE
S
I0n
I1n
Yn
H
X
X
X
Z
L
L
L
X
L
L
L
H
X
H
L
H
X
L
L
L
H
X
H
H
H = High voltage level
L
= Low voltage level
X = Don't care
Z = High impedance "off" state
FUNCTION TABLE 74ALS258
INPUTS
OUTPUT
OE
S
I0n
I1n
Yn
H
X
X
X
Z
L
L
L
X
H
L
L
H
X
L
L
H
X
L
H
L
H
X
H
L
H = High voltage level
L
= Low voltage level
X = Don't care
Z = High impedance "off" state
ABSOLUTE MAXIMUM RATINGS
(Operation beyond the limit set forth in this table may impair the useful life of the device.
Unless otherwise noted these limits are over the operating free air temperature range.)
SYMBOL
PARAMETER
RATING
UNIT
V
CC
Supply voltage
0.5 to +7.0
V
V
IN
Input voltage
0.5 to +7.0
V
I
IN
Input current
30 to +5
mA
V
OUT
Voltage applied to output in High output state
0.5 to V
CC
V
I
OUT
Current applied to output in Low output state
48
mA
T
amb
Operating free-air temperature range
0 to +70
C
T
stg
Storage temperature range
65 to +150
C
RECOMMENDED OPERATING CONDITIONS
SYMBOL
PARAMETER
LIMITS
UNIT
SYMBOL
PARAMETER
MIN
NOM
MAX
UNIT
V
CC
Supply voltage
4.5
5.0
5.5
V
V
IH
High-level input voltage
2.0
V
V
IL
Low-level input voltage
0.8
V
I
IK
Input clamp current
18
mA
I
OH
High-level output current
2.6
mA
I
OL
Low-level output current
24
mA
T
amb
Operating free-air temperature range
0
+70
C
Philips Semiconductors
Product specification
74ALS257/74ALS258
Data selector/multiplexer
1991 Feb 08
5
DC ELECTRICAL CHARACTERISTICS
(Over recommended operating free-air temperature range unless otherwise noted.)
SYMBOL
PARAMETER
TEST CONDITIONS
1
LIMITS
UNIT
SYMBOL
PARAMETER
TEST CONDITIONS
1
MIN
TYP
2
MAX
UNIT
V
O
High level output voltage
V
CC
=
10%, V
IL
= MAX,
I
OH
= 0.4mA
V
CC
2
V
V
OH
High-level output voltage
CC
,
IL
,
V
IH
= MIN
I
OH
= MAX
2.4
3.2
V
V
O
Low level output voltage
V
CC
= MIN, V
IL
= MAX,
I
OL
= 12mA
0.25
0.40
V
V
OL
Low-level output voltage
CC
,
IL
,
V
IH
= MIN
I
OL
= 24mA
0.35
0.50
V
V
IK
Input clamp voltage
V
CC
= MIN, I
I
= I
IK
0.73
1.5
V
I
I
Input current at maximum input voltage
V
CC
= MAX, V
I
= 7.0V
0.1
mA
I
IH
High-level input current
V
CC
= MAX, V
I
= 2.7V
20
A
I
IL
Low-level input current
V
CC
= MAX, V
I
= 0.4V
0.1
mA
I
OZH
Off-state output current,
High-level voltage applied
V
CC
= MAX, V
I
= 2.7V
20
A
I
OZL
Off-state output current,
Low-level voltage applied
V
CC
= MAX, V
I
= 0.4V
20
A
I
O
Output current
3
V
CC
= MAX, V
O
= 2.25V
30
112
mA
I
CCH
3
6
mA
74ALS257
I
CCL
V
CC
= MAX
8
12
mA
I
CC
Supply current (total)
I
CCZ
9
14
mA
I
CC
Supply current (total)
I
CCH
2.5
4
mA
74ALS258
I
CCL
V
CC
= MAX
7
11
mA
I
CCZ
9
13
mA
NOTES:
1. For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions for the applicable type.
2. All typical values are at V
CC
= 5V, T
amb
= 25
C.
3. The output conditions have been chosen to produce a current that closely approximates one half of the true short-circuit output current, I
OS
.
Philips Semiconductors
Product specification
74ALS257/74ALS258
Data selector/multiplexer
1991 Feb 08
6
AC ELECTRICAL CHARACTERISTICS
LIMITS
SYMBOL
PARAMETER
TEST CONDITION
T
amb
= 0
C to +70
C
V
CC
= +5.0V
10%
C
L
= 50pF, R
L
= 500
UNIT
MIN
MAX
t
PLH
t
PHL
Propagation delay
I0n or I1n to Yn
Waveform 1
2.0
2.0
9.0
9.0
ns
t
PLH
t
PHL
Propagation delay
S to Yn
74ALS257
Waveform 1, 2
4.0
4.0
12.0
12.0
ns
t
PZH
t
PZL
Output enable time
OE to Yn
74ALS257
Waveform 3
Waveform 4
3.0
4.0
11.0
12.0
ns
t
PHZ
t
PLZ
Output disable time
OE to Yn
Waveform 3
Waveform 4
2.0
5.0
9.0
12.0
ns
t
PLH
t
PHL
Propagation delay
I0n or I1n to Yn
Waveform 1
2.0
2.0
8.0
8.0
ns
t
PLH
t
PHL
Propagation delay
S to Yn
74ALS258
Waveform 1, 2
4.0
4.0
12.0
12.0
ns
t
PZH
t
PZL
Output enable time
OE to Yn
74ALS258
Waveform 3
Waveform 4
3.0
4.0
11.0
12.0
ns
t
PHZ
t
PLZ
Output disable time
OE to Yn
Waveform 3
Waveform 4
2.0
5.0
9.0
12.0
ns
AC WAVEFORMS
For all waveforms, V
M
= 1.3V.
V
M
V
M
V
M
V
M
t
PHL
t
PLH
I0n, I1n, S
Yn, Yn
SC00059
Waveform 1.
Propagation Delay for Data and
Select to Outputs
V
M
V
M
V
M
V
M
t
PLH
t
PHL
I0n, I1n, S
Yn, Yn
SC00060
Waveform 2.
Propagation Delay for Data and
Select to Outputs
V
M
V
M
V
M
t
PHZ
t
PZH
OE
Yn, Yn
V
OH
-0.3V
0V
SC00084
Waveform 3.
3-State Output Enable Time to High Level
and Output Disable Time from High Level
V
M
V
M
V
M
t
PLZ
t
PZL
OEn
Yn, Yn
V
OL
+0.3V
SC00085
3.5V
Waveform 4.
3-State Output Enable Time to Low Level
and Output Disable Time from Low Level
Philips Semiconductors
Product specification
74ALS257/74ALS258
Data selector/multiplexer
1991 Feb 08
7
TEST CIRCUIT AND WAVEFORMS
tw
90%
VM
10%
90%
VM
10%
90%
VM
10%
90%
VM
10%
NEGATIVE
PULSE
POSITIVE
PULSE
tw
AMP (V)
0.3V
0.3V
tTHL (tf
f
)
INPUT PULSE REQUIREMENTS
Rep.Rate
t
w
t
TLH
t
THL
1MHz
500ns
2.0ns
2.0ns
Input Pulse Definition
VCC
Family
74ALS
D.U.T.
PULSE
GENERATOR
RL
CL
RT
VIN
VOUT
Test Circuit for 3-State Outputs
DEFINITIONS:
R
L
= Load resistor;
see AC electrical characteristics for value.
C
L
= Load capacitance includes jig and probe capacitance;
see AC electrical characteristics for value.
R
T
= Termination resistance should be equal to Z
OUT
of
pulse generators.
tTHL (tf
)
tTLH (tr
)
tTLH (tr
)
AMP (V)
Amplitude
3.5V
1.3V
V
M
SC00072
RL
7.0V
SWITCH POSITION
TEST
SWITCH
t
PLZ
, t
PZL
closed
All other
open
Philips Semiconductors
Product specification
74ALS257/74ALS258
Data selector/multiplexer
1991 Feb 08
8
DIP16:
plastic dual in-line package; 16 leads (300 mil)
SOT38-4
Philips Semiconductors
Product specification
74ALS257/74ALS258
Data selector/multiplexer
1991 Feb 08
9
SO16:
plastic small outline package; 16 leads; body width 3.9 mm
SOT109-1
Philips Semiconductors
Product specification
74ALS257/74ALS258
Data selector/multiplexer
1991 Feb 08
10
SSOP16:
plastic shrink small outline package; 16 leads; body width 5.3 mm
SOT338-1
Philips Semiconductors
Product specification
74ALS257/74ALS258
Data selector/multiplexer
1991 Feb 08
11
Philips Semiconductors and Philips Electronics North America Corporation reserve the right to make changes, without notice, in the products,
including circuits, standard cells, and/or software, described or contained herein in order to improve design and/or performance. Philips
Semiconductors assumes no responsibility or liability for the use of any of these products, conveys no license or title under any patent, copyright,
or mask work right to these products, and makes no representations or warranties that these products are free from patent, copyright, or mask
work right infringement, unless otherwise specified. Applications that are described herein for any of these products are for illustrative purposes
only. Philips Semiconductors makes no representation or warranty that such applications will be suitable for the specified use without further testing
or modification.
LIFE SUPPORT APPLICATIONS
Philips Semiconductors and Philips Electronics North America Corporation Products are not designed for use in life support appliances, devices,
or systems where malfunction of a Philips Semiconductors and Philips Electronics North America Corporation Product can reasonably be expected
to result in a personal injury. Philips Semiconductors and Philips Electronics North America Corporation customers using or selling Philips
Semiconductors and Philips Electronics North America Corporation Products for use in such applications do so at their own risk and agree to fully
indemnify Philips Semiconductors and Philips Electronics North America Corporation for any damages resulting from such improper use or sale.
This data sheet contains preliminary data, and supplementary data will be published at a later date. Philips
Semiconductors reserves the right to make changes at any time without notice in order to improve design
and supply the best possible product.
Philips Semiconductors
811 East Arques Avenue
P.O. Box 3409
Sunnyvale, California 940883409
Telephone 800-234-7381
DEFINITIONS
Data Sheet Identification
Product Status
Definition
Objective Specification
Preliminary Specification
Product Specification
Formative or in Design
Preproduction Product
Full Production
This data sheet contains the design target or goal specifications for product development. Specifications
may change in any manner without notice.
This data sheet contains Final Specifications. Philips Semiconductors reserves the right to make changes
at any time without notice, in order to improve design and supply the best possible product.
Copyright Philips Electronics North America Corporation 1997
All rights reserved. Printed in U.S.A.
Philips
Semiconductors
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