Philips 74als253 DATASHEETS
INTEGRATED CIRCUITS
74ALS253
Dual 4–input multiplexer (3–State)
Product specification
IC05 Data Handbook
1991 Feb 08
Philips Semiconductors Product specification
74ALS253Dual 4-input multiplexer (3-State)
FEA TURES
•3-State outputs for bus interface and multiplex operation
•Common select inputs
•Separate output enable inputs
DESCRIPTION
The 74ALS253 has two identical 4-input multiplexers with 3-State
outputs which select 2 bits from four sources by using common
select input (S0, S1). When the individual output enable (OE
OE
b) inputs of the 4-input multiplexers are High, the outputs are
forced to a High impedance (Z) state.
The 74ALS253 is the logic implementation of 2-pole, 4-position
switch being determined by the logic levels supplied to the common
select inputs.
To avoid exceeding the maximum current ratings when the outputs
of the 3-State devices are tied together, all but one device must be
in the High impedance state. Therefore, only one output enable
must be achieved at a time.
TYPE
TYPICAL
PROPAGATION DELAY
TYPICAL
SUPPLY CURRENT
(TOTAL)
74ALS253 7.0ns 8mA
a,
PIN CONFIGURATION
OE
I3a
I2a
I1a
I0a
1
a
2
S1
3
4
5
6
Ya
16
15
14
13
12
11
107
98GND Yb
V
OE
S0
I3b
I2b
I1b
I0b
CC
b
ORDERING INFORMA TION
ORDER CODE
DESCRIPTION COMMERCIAL RANGE
V
= 5V ±10%,
CC
T
= 0°C to +70°C
amb
16-pin plastic DIP 74ALS253N SOT38-4
16-pin plastic SO 74ALS253D SOT109-1
16-pin plastic SSOP
Type II
74ALS253DB SOT338-1
DRAWING
NUMBER
SF00798
INPUT AND OUTPUT LOADING AND FAN-OUT TABLE
PINS DESCRIPTION
I0a – I3a Port A data inputs 1.0/1.0 20µA/0.1mA
I0b – I3b Port B data inputs 1.0/1.0 20µA/0.1mA
S0, S1 Common select inputs 1.0/1.0 20µA/0.1mA
OEa Port A Output Enable input (active-Low) 1.0/1.0 20µA/0.1mA
OEb Port B Output Enable input (active-Low) 1.0/1.0 20µA/0.1mA
Ya – Yb 3-State outputs 130/240 2.6mA/24mA
NOTE: One (1.0) ALS unit load is defined as: 20µA in the High state and 0.1mA in the Low state.
LOGIC SYMBOL
14
2
1
15
= Pin 16
V
CC
GND = Pin 8
6 13121110
I0a I1a I2a I3a I0b I1b I2b I3b
S0
S1
OEa
OEb
345
Ya Yb
97
SF00799
IEC/IEEE SYMBOL
74ALS (U.L.)
HIGH/LOW
14
2
1
6
5
4
3
15
10
11
12
13
0
2
EN
0
G
3
MUX
0
1
2
3
LOAD VALUE
HIGH/LOW
7
9
SC00073
1991 Feb 08 853–1378 01670
2
Philips Semiconductors Product specification
SYMBOL
PARAMETER
UNIT
74ALS253Dual 4-input multiplexer (3-State)
LOGIC DIAGRAM
I0a6I1a5I2a4I3a
OEa
1
S12S014I0b10I1b11I2b12I3b13OEb
3
15
FUNCTION TABLE
S0 S1 I0 I1 I2 I3 OEn Yn
X X X X X X H Z
L L L X X X L L
L L H X X X L H
H L X L X X L L
H L X H X X L H
L H X X L X L L
L H X X H X L H
H H X X X L L L
H H X X X H L H
H = High voltage level
L = Low voltage level
X = Don’t care
Z = High impedance “off” state
VCC = Pin 16
GND = Pin 8
7
Ya
9
Yb
SC00074
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 –0.5 to +7.0 V
Input voltage –0.5 to +7.0 V
Input current –30 to +5 mA
Voltage applied to output in High output state –0.5 to V
Current applied to output in Low output state 48 mA
Operating free-air temperature range 0 to +70 °C
Storage temperature range –65 to +150 °C
PARAMETER RATING UNIT
INPUTS OUTPUTS
CC
V
RECOMMENDED OPERATING CONDITIONS
V
CC
V
V
I
IK
I
OH
I
OL
T
amb
1991 Feb 08
Supply voltage 4.5 5.0 5.5 V
High-level input voltage 2.0 V
IH
Low-level input voltage 0.8 V
IL
Input clamp current –18 mA
High-level output current –2.6 mA
Low-level output current 24 mA
Operating free-air temperature range 0 +70 °C
LIMITS
MIN NOM MAX
3
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