INTEGRATED CIRCUITS
74ALS253
Dual 4–input multiplexer (3–State)
Product specification
IC05 Data Handbook
1991 Feb 08
Philips
Semiconductors
Philips Semiconductors
Product specification
Dual 4-input multiplexer (3-State)
74ALS253
FEATURES
•
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 (OEa,
OEb) 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.
TYPICAL
SUPPLY CURRENT
(TOTAL)
8mA
PIN CONFIGURATION
OEa
S1
I3a
I2a
I1a
I0a
Ya
GND
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
V
CC
OEb
S0
I3b
I2b
I1b
I0b
Yb
SF00798
ORDERING INFORMATION
ORDER CODE
DESCRIPTION
COMMERCIAL RANGE
V
CC
= 5V
±10%,
T
amb
= 0°C to +70°C
74ALS253N
74ALS253D
74ALS253DB
DRAWING
NUMBER
TYPE
74ALS253
TYPICAL
PROPAGATION DELAY
7.0ns
16-pin plastic DIP
16-pin plastic SO
16-pin plastic SSOP
Type II
SOT38-4
SOT109-1
SOT338-1
INPUT AND OUTPUT LOADING AND FAN-OUT TABLE
PINS
I0a – I3a
I0b – I3b
S0, S1
OEa
OEb
Ya – Yb
Port A data inputs
Port B data inputs
Common select inputs
Port A Output Enable input (active-Low)
Port B Output Enable input (active-Low)
3-State outputs
DESCRIPTION
74ALS (U.L.)
HIGH/LOW
1.0/1.0
1.0/1.0
1.0/1.0
1.0/1.0
1.0/1.0
130/240
LOAD VALUE
HIGH/LOW
20µA/0.1mA
20µA/0.1mA
20µA/0.1mA
20µA/0.1mA
20µA/0.1mA
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
6
5
4
3
10
11
12
13
IEC/IEEE SYMBOL
14
2
0
2
G
0
3
I0a
14
2
1
15
S0
S1
OEa
OEb
I1a
I2a
I3a
I0b
I1b
I2b
I3b
1
6
5
4
3
EN
0
1
2
3
MUX
7
Ya
Yb
15
10
11
12
9
V
CC
= Pin 16
GND = Pin 8
7
9
13
SF00799
SC00073
1991 Feb 08
2
853–1378 01670
Philips Semiconductors
Product specification
Dual 4-input multiplexer (3-State)
74ALS253
LOGIC DIAGRAM
OEa
1
I0a
6
I1a
5
I2a
4
I3a
3
S1
2
S0
14
I0b
10
I1b
11
I2b
12
I3b
13
OEb
15
FUNCTION TABLE
INPUTS
S0
X
L
L
H
H
L
L
H
H
S1
X
L
L
L
L
H
H
H
H
I0
X
L
H
X
X
X
X
X
X
I1
X
X
X
L
H
X
X
X
X
I2
X
X
X
X
X
L
H
X
X
I3
X
X
X
X
X
X
X
L
H
OEn
H
L
L
L
L
L
L
L
L
OUTPUTS
Yn
Z
L
H
L
H
L
H
L
H
7
Ya
V
CC
= Pin 16
GND = Pin 8
9
Yb
H
L
X
Z
SC00074
=
=
=
=
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
LIMITS
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
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
3
Philips Semiconductors
Product specification
Dual 4-input multiplexer (3-State)
74ALS253
DC ELECTRICAL CHARACTERISTICS
(Over recommended operating free-air temperature range unless otherwise noted.)
SYMBOL
PARAMETER
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
I
CC
I
CCZ
V
CC
= MAX
–30
7.0
9.0
I
OH
= –0.4mA
I
OH
= –2.6mA
I
OL
= 12mA
I
OL
= 24mA
LIMITS
MIN
V
CC
– 2
2.4
0.25
0.35
–0.73
0.40
0.50
–1.5
0.1
20
–0.1
20
–20
–112
12
14
TYP
2
MAX
UNIT
V
V
V
V
V
mA
µA
mA
µA
µA
mA
mA
mA
V
O
OH
High-level
High level output voltage
V
O
OL
V
IK
I
I
I
IH
I
IL
I
OZH
I
OZL
I
O
I
CC
Low-level
Low level output voltage
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
Supply current (total)
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
.
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
= 500Ω
MIN
t
PLH
t
PHL
t
PLH
t
PHL
t
PZH
t
PZL
t
PHZ
t
PLZ
Propagation delay
In to Yn
Propagation delay
Sn to Yn
Output enable time, High or Low level
OEn to Yn
Output disable time, High or Low level
OEn to Yn
Waveform 1
Waveform 1
Waveform 2
Waveform 3
Waveform 2
Waveform 3
4.0
4.0
5.0
7.0
1.0
3.0
1.0
1.0
MAX
12.0
12.0
15.0
16.0
8.0
9.0
7.0
7.0
ns
ns
ns
ns
UNIT
1991 Feb 08
4
Philips Semiconductors
Product specification
Dual 4-input multiplexer (3-State)
74ALS253
AC WAVEFORMS
For all waveforms, V
M
= 1.3V.
In, Sn
V
M
t
PLH
V
M
t
PHL
Yn
V
M
V
M
SF00802
Waveform 1. Propagation Delay for Data and Select to Output
OEn
V
M
t
PZH
V
M
t
PHZ
V
OH
–0.3V
OEn
V
M
t
PZL
V
M
t
PLZ
3.5V
V
M
V
OL
+0.3V
Yn
V
M
0V
Yn
SF00804
SC00075
Waveform 2. 3-State Output Enable Time to High Level
and Output Disable Time from High Level
Waveform 3. 3-State Output Enable Time to Low Level
and Output Disable Time from Low Level
TEST CIRCUIT AND WAVEFORMS
V
CC
7.0V
NEGATIVE
PULSE
90%
V
M
10%
t
THL (
t
f
f
)
C
L
R
L
t
w
V
M
10%
t
TLH (
t
r
)
0.3V
90%
AMP (V)
V
IN
PULSE
GENERATOR
R
T
D.U.T.
V
OUT
R
L
t
TLH (
t
r
)
90%
t
THL (
t
f
)
AMP (V)
90%
V
M
t
w
10%
0.3V
Test Circuit for 3-State Outputs
SWITCH POSITION
TEST
SWITCH
closed
t
PLZ
, t
PZL
All other
open
POSITIVE
PULSE
10%
V
M
Input Pulse Definition
INPUT PULSE REQUIREMENTS
Family
Amplitude V
M
74ALS
3.5V
1.3V
Rep.Rate
1MHz
t
w
500ns
t
TLH
2.0ns
t
THL
2.0ns
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.
SC00072
1991 Feb 08
5
嵌入式系统
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