INTEGRATED CIRCUITS
74ALS257/74ALS258
Data selector/multiplexer
Product specification
IC05 Data Handbook
1991 Feb 08
Philips
Semiconductors
Philips Semiconductors
Product specification
Data selector/multiplexer
74ALS257 Quad 2-input data selector, non-inverting (3-State)
74ALS258 Quad 2-input data selector, inverting (3-State)
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
74ALS257
74ALS258
74ALS257/74ALS258
TYPICAL
PROPAGATION DELAY
7.0ns
7.0ns
TYPICAL
SUPPLY CURRENT
(TOTAL)
7mA
7mA
ORDERING INFORMATION
ORDER CODE
DESCRIPTION
COMMERCIAL RANGE
V
CC
= 5V
±10%,
T
amb
= 0°C to +70°C
74ALS257N, 74ALS258
74ALS257D, 74ALS258D
74ALS257DB, 74ALS258DB
DRAWING
NUMBER
SOT38-4
SOT109-1
SOT338-1
16-pin plastic DIP
16-pin plastic SO
16-pin plastic SSOP
Type II
INPUT AND OUTPUT LOADING AND FAN-OUT TABLE
PINS
Ina, Inb, Inc, Ind
S
OE
Ya – Yd, Ya – Yd
Data inputs
Select input
Enable input
Data outputs
DESCRIPTION
74ALS (U.L.)
HIGH/LOW
1.0/1.0
1.0/1.0
1.0/1.0
20/240
LOAD VALUE
HIGH/LOW
20µA/0.1mA
20µA/0.1mA
20µA/0.1mA
0.4mA/24mA
NOTE:
One (1.0) ALS unit load is defined as: 20µA in the High state and 0.1mA in the Low state.
PIN CONFIGURATION – 74ALS257
S
I0a
I1a
Ya
I0b
I1b
Yb
GND
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
V
CC
OE
I0d
I1d
Yd
I0c
I1c
Yc
PIN CONFIGURATION – 74ALS258
S
I0a
I1a
Ya
I0b
I1b
Yb
GND
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
V
CC
OE
I0d
I1d
Yd
I0c
I1c
Yc
SF00673
SC00079
1991 Feb 08
2
853–1130 01670
Philips Semiconductors
Product specification
Data selector/multiplexer
74ALS257/74ALS258
LOGIC SYMBOL – 74ALS257
LOGIC SYMBOL – 74ALS258
2
3
5
6
11
10
14
13
2
3
5
6
11
10
14
13
I0a I1a I0b
1
15
S
OE
Ya
I1b
I0c
I1c
I0d I1d
1
15
S
OE
I0a I1a I0b
I1b
I0c
I1c
I0d I1d
Yb
Yc
Yd
Ya
Yb
Yc
Yd
V
CC
= Pin 16
GND = Pin 8
4
7
9
12
SF00674
V
CC
= Pin 16
GND = Pin 8
4
7
9
12
SC00080
IEC/IEEE SYMBOL – 74ALS257
15
1
EN
G1
IEC/IEEE SYMBOL – 74ALS258
15
1
EN
G1
2
3
5
6
10
1
1
MUX
4
2
3
7
5
6
10
9
1
1
MUX
4
7
9
11
13
14
11
13
14
12
12
SF00675
SC00081
LOGIC DIAGRAM – 74ALS257
OE
I0a
15
2
I1a
3
I0b
5
I1b
6
I0c
11
I1c
10
I0d
14
I1d
S
13
1
LOGIC DIAGRAM – 74ALS258
OE
I0a
15
2
I1a
3
I0b
5
I1b
6
I0c
11
I1c
10
I0d
14
I1d
S
13
1
4
V
CC
= Pin 16
GND = Pin 8
Ya
Yb
7
9
Yc
Yd
12
4
7
Yb
9
Yc
Yd
12
SC00082
V
CC
= Pin 16
GND = Pin 8
Ya
SC00083
1991 Feb 08
3
Philips Semiconductors
Product specification
Data selector/multiplexer
74ALS257/74ALS258
FUNCTION TABLE – 74ALS257
INPUTS
OE
H
L
L
L
L
H
L
X
Z
=
=
=
=
S
X
L
L
H
H
I0n
X
L
H
X
X
I1n
X
X
X
L
H
OUTPUT
Yn
Z
L
H
L
H
FUNCTION TABLE – 74ALS258
INPUTS
OE
H
L
L
L
L
H
L
X
Z
=
=
=
=
S
X
L
L
H
H
I0n
X
L
H
X
X
I1n
X
X
X
L
H
OUTPUT
Yn
Z
H
L
H
L
High voltage level
Low voltage level
Don’t care
High impedance “off” state
High voltage level
Low voltage level
Don’t care
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
V
CC
V
IN
I
IN
V
OUT
I
OUT
T
amb
T
stg
Supply voltage
Input voltage
Input current
Voltage applied to output in High output state
Current applied to output in Low output state
Operating free-air temperature range
Storage temperature range
PARAMETER
RATING
–0.5 to +7.0
–0.5 to +7.0
–30 to +5
–0.5 to V
CC
48
0 to +70
–65 to +150
UNIT
V
V
mA
V
mA
°C
°C
RECOMMENDED OPERATING CONDITIONS
SYMBOL
V
CC
V
IH
V
IL
I
IK
I
OH
I
OL
T
amb
Supply voltage
High-level input voltage
Low-level input voltage
Input clamp current
High-level output current
Low-level output current
Operating free-air temperature range
0
PARAMETER
LIMITS
MIN
4.5
2.0
0.8
–18
–2.6
24
+70
NOM
5.0
MAX
5.5
UNIT
V
V
V
mA
mA
mA
°C
1991 Feb 08
4
Philips Semiconductors
Product specification
Data selector/multiplexer
74ALS257/74ALS258
DC ELECTRICAL CHARACTERISTICS
(Over recommended operating free-air temperature range unless otherwise noted.)
SYMBOL
V
O
OH
V
O
OL
V
IK
I
I
I
IH
I
IL
I
OZH
I
OZL
I
O
PARAMETER
High-level
High level output voltage
Low level output voltage
Low-level
Input clamp voltage
Input current at maximum input voltage
High-level input current
Low-level input current
Off-state output current,
High-level voltage applied
Off-state output current,
Low-level voltage applied
Output current
3
I
CCH
74ALS257
I
CC
Supply current (total)
74ALS258
I
CCL
I
CCZ
I
CCH
I
CCL
I
CCZ
V
CC
= MAX
V
CC
= MAX
TEST CONDITIONS
1
V
CC
=
±10%,
V
IL
= MAX,
,
,
V
IH
= MIN
V
CC
= MIN, V
IL
= MAX,
,
,
V
IH
= MIN
V
CC
= MIN, I
I
= I
IK
V
CC
= MAX, V
I
= 7.0V
V
CC
= MAX, V
I
= 2.7V
V
CC
= MAX, V
I
= 0.4V
V
CC
= MAX, V
I
= 2.7V
V
CC
= MAX, V
I
= 0.4V
V
CC
= MAX, V
O
= 2.25V
–30
3
8
9
2.5
7
9
I
OH
= –0.4mA
I
OH
= MAX
I
OL
= 12mA
I
OL
= 24mA
LIMITS
MIN
V
CC
– 2
2.4
3.2
0.25
0.35
–0.73
0.40
0.50
–1.5
0.1
20
–0.1
20
–20
–112
6
12
14
4
11
13
TYP
2
MAX
UNIT
V
V
V
V
V
mA
µA
mA
µA
µA
mA
mA
mA
mA
mA
mA
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
.
1991 Feb 08
5
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