Philips N74ALS253N, N74ALS253DB, N74ALS253D Datasheet
74ALS253
Dual 4–input multiplexer (3–State)
Product specification
IC05 Data Handbook
1991 Feb 08
INTEGRATED CIRCUITS
Philips Semiconductors Product specification
74ALS253Dual 4-input multiplexer (3-State)
2
1991 Feb 08 853–1378 01670
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
a,
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
PIN CONFIGURATION
16
15
14
13
12
11
107
6
5
4
3
2
1
Ya
V
CC
I2b
I1b
I0b
I3b
OE
b
S0
OE
a
S1
I0a
I3a
I2a
I1a
98GND Yb
SF00798
ORDERING INFORMA TION
ORDER CODE
DESCRIPTION COMMERCIAL RANGE
V
CC
= 5V ±10%,
T
amb
= 0°C to +70°C
DRAWING
NUMBER
16-pin plastic DIP 74ALS253N SOT38-4
16-pin plastic SO 74ALS253D SOT109-1
16-pin plastic SSOP
Type II
74ALS253DB SOT338-1
INPUT AND OUTPUT LOADING AND FAN-OUT TABLE
PINS DESCRIPTION
74ALS (U.L.)
HIGH/LOW
LOAD VALUE
HIGH/LOW
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
345
V
CC
= Pin 16
GND = Pin 8
SF00799
97
14
2
1
S0
S1
OEa
15
6 13121110
OEb
Ya Yb
I0a I1a I2a I3a I0b I1b I2b I3b
IEC/IEEE SYMBOL
SC00073
MUX
1
6
15
10
11
7
9
0
5
2
EN
4
3
13
12
1
3
0
G
0
3
2
14
2
Philips Semiconductors Product specification
74ALS253Dual 4-input multiplexer (3-State)
1991 Feb 08
3
LOGIC DIAGRAM
VCC = Pin 16
GND = Pin 8
SC00074
I0a6I1a5I2a4I3a
3
OEa
1
S12S014I0b10I1b11I2b12I3b13OEb
15
Ya
7
Yb
9
FUNCTION TABLE
INPUTS OUTPUTS
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
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
LIMITS
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
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