Page 1
INTEGRATED CIRCUITS
74ALS251
8–input multiplexer (3–State)
Product specification
IC05 Data Handbook
1991 Feb 08
Page 2
Philips Semiconductors Product specification
74ALS2518-input multiplexer (3-State)
FEA TURES
•8-to-1 multiplexing
•On chip decoding
•Multifunction capability
•Inverting and non-inverting outputs
•Both outputs are 3-State for further multiplexer expansion
DESCRIPTION
The 74ALS251 is a logic implementation of a single 8-position
switch with the switch position controlled by the state of three select
(S0, S1, S2) inputs. True (Y) and complementary (Y
both provided.
The output enable (OE
) is active Low. When OE is High, both
outputs are in High impedance state, allowing multiple connections
to a common bus without driving nor loading the bus significantly.
When the outputs of more than one device are tied together, the
user must ensure that there is no overlap in the active-Low portion
of the output enable voltages in order to avoid high currents that
could exceed the maximum current rating.
TYPE
TYPICAL
PROPAGATION DELAY
74ALS251 7.0ns 7.5mA
) outputs are
TYPICAL
SUPPLY CURRENT
(TOTAL)
PIN CONFIGURATION
16
15
14
13
12
11
107
98GND S2
V
CC
I4
I5
I6
I7
S0
S1
OE
1
I3
2
I2
I1
3
I0
4
Y
5
6
Y
ORDERING INFORMA TION
ORDER CODE
DESCRIPTION COMMERCIAL RANGE
V
= 5V ±10%,
CC
T
= 0°C to +70°C
amb
16-pin plastic DIP 74ALS251N SOT38-4
16-pin plastic SO 74ALS251D SOT109-1
DRAWING
NUMBER
SC00066
INPUT AND OUTPUT LOADING AND FAN-OUT TABLE
PINS DESCRIPTION
I0 – I7 Data inputs 1.0/1.0 20µA/0.1mA
S0 – S2 Select inputs 1.0/1.0 20µA/0.1mA
OE Output Enable input (active-Low) 1.0/1.0 20µA/0.1mA
Y, Y Data outputs 130/240 2.5mA/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
11 S0
10 S1
9
7
VCC = Pin 16
GND = Pin 8
4 3 2 1 15 14 13
I0 I1 I2 I3 I4 I5 I6
S2
OE
YY
56
12
I7
SC00067
IEC/IEEE SYMBOL
74ALS (U.L.)
HIGH/LOW
7
11
10
9
4
3
2
1
15
14
13
12
EN
0
2
MUX
0
G
7
LOAD VALUE
HIGH/LOW
5
6
SC00068
1991 Feb 08 853–1377 01670
2
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Philips Semiconductors Product specification
SYMBOL
PARAMETER
UNIT
74ALS2518-input multiplexer (3-State)
LOGIC DIAGRAM
9
S2
10
S1
11
S0
7
OE
I0 I1 I2 I3 I4 I5 I6 I7
4 3 2 1 15 14 13 12
FUNCTION TABLE
S2 S1 S0 OE Y Y
X X X H Z Z
L L L L I0 I0
L L H L I1 I1
L H L L I2 I2
L H H L I3 I3
H L L L I4 I4
H L H L I5 I5
H H L L I6 I6
H H H L I7 I7
H = High voltage level
L = Low voltage level
X = Don’t care
Z = High impedance “off” state
VCC = Pin 16
GND = Pin 8
56
YY
SC00069
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
Page 4
Philips Semiconductors Product specification
SYMBOL
PARAMETER
TEST CONDITIONS
1
UNIT
VOHHigh-level output voltage
CC
,
IL
,
VOLLow-level output voltage
CC
,
IL
,
ICCSupply current (total)
V
MAX
74ALS2518-input multiplexer (3-State)
DC ELECTRICAL CHARACTERISTICS
(Over recommended operating free-air temperature range unless otherwise noted.)
LIMITS
MIN TYP
– 2 V
CC
V
I
I
I
OZH
I
OZL
p
p
Input clamp voltage VCC = MIN, II = I
IK
I
IH
Input current at maximum input voltage VCC = MAX, VI = 7.0V 0.1 mA
I
High-level input current VCC = MAX, VI = 2.7V 20 µA
Low-level input current VCC = MAX, VI = 0.4V –0.1 mA
IL
Off-state output current,
High-level voltage applied
Off-state output current,
Low-level voltage applied
I
O
Output current
3
pp
VCC±10%, VIL = MAX,
VIH = MIN
VCC = MIN, VIL = MAX,
VIH = MIN
IK
VCC = MAX, VI = 2.7V 20 µA
VCC = MAX, VI = 0.4V –20 µA
VCC = MAX, VO = 2.25V –30 –112 mA
I
CC
I
CCZ
CC
=
IOH = –0.4mA V
IOH = –2.6mA 2.4 3.2 V
I
= 12mA 0.25 0.40 V
OL
I
= 24mA 0.35 0.50 V
OL
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
3. The output conditions have been chosen to produce a current that closely approximates one half of the true short-circuit output current, I
= 5V, T
CC
amb
= 25°C.
2
MAX
–0.73 –1.5 V
7.0 10 mA
9.0 14 mA
OS
.
AC ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER TEST CONDITION
t
PLH
t
PHL
t
PLH
t
PHL
t
PLH
t
PHL
t
PLH
t
PHL
t
PZH
t
PZL
t
PHZ
t
PLZ
t
PZH
t
PZL
t
PHZ
t
PLZ
Propagation delay
In to Y
Propagation delay
In to Y
Propagation delay
Sn to Y
Propagation delay
Sn to Y
Propagation delay
OE
to Y
Propagation delay
OE
to Y
Propagation delay
OE
to Y
Propagation delay
OE
to Y
Waveform 2
Waveform 1
Waveform 1, 2
Waveform 1, 2
Waveform 3
Waveform 4
Waveform 3
Waveform 4
Waveform 3
Waveform 4
Waveform 3
Waveform 4
LIMITS
T
= 0°C to +70°C
amb
V
= +5.0V ± 10%
CC
C
= 50pF, RL = 500Ω
L
MIN MAX
4.0
4.0
3.0
6.0
5.0
7.0
8.0
5.0
2.0
3.0
2.0
1.0
2.0
3.0
2.0
1.0
12.0
12.0
10.0
15.0
15.0
16.0
17.0
15.0
8.0
9.0
8.0
7.0
8.0
9.0
8.0
7.0
UNIT
ns
ns
ns
ns
ns
ns
ns
ns
1991 Feb 08
4
Page 5
Philips Semiconductors Product specification
74ALS2518-input multiplexer (3-State)
AC WAVEFORMS
For all waveforms, VM = 1.3V.
V
V
IN
V
M
t
PHL
V
M
t
PLH
IN
V
M
t
PLH
V
M
t
PHL
V
OUT
V
M
V
M
Waveform 1. Propagation Delay for Inverting Output
OE
Y, Y
V
M
t
PZH
V
M
t
PHZ
V
M
Waveform 3. 3-State Output Enable Time to High Level
and Output Disable Time from High Level
TEST CIRCUIT AND WAVEFORMS
V
CC
PULSE
GENERATOR
V
IN
D.U.T.
V
OUT
R
L
SF00093
VOH -0.3V
0V
SC00070
7.0V
NEGATIVE
PULSE
V
V
OUT
M
V
M
SF00092
Waveform 2. Propagation Delay for Non-inverting Output
OE
Y, Y
V
M
t
PZL
V
M
t
PLZ
V
M
3.5V
VOL +0.3V
SC00071
Waveform 4. 3-State Output Enable Time to Low Level
and Output Disable Time from Low Level
90%
t
w
TLH (tr
10%
)
V
M
V
M
10%
)
t
THL (tf
f
t
90%
AMP (V)
0.3V
R
T
C
R
L
L
Test Circuit for 3-State Outputs
SWITCH POSITION
TEST SWITCH
t
PLZ
, t
PZL
closed
All other open
DEFINITIONS:
R
= Load resistor;
L
see AC electrical characteristics for value.
CL= Load capacitance includes jig and probe capacitance;
see AC electrical characteristics for value.
R
= T ermination resistance should be equal to Z
T
pulse generators.
1991 Feb 08
OUT
of
POSITIVE
PULSE
Family
74ALS
5
10%
Amplitude
t
V
90%
M
TLH (tr
)
t
THL (tf
t
w
Input Pulse Definition
INPUT PULSE REQUIREMENTS
V
Rep.Rate
M
3.5V
1.3V
1MHz
)
90%
t
w
500ns
V
M
t
TLHtTHL
2.0ns 2.0ns
10%
AMP (V)
0.3V
SC00072
Page 6
Philips Semiconductors Product specification
74ALS2518–input multiplexer (3–State)
DIP16: plastic dual in-line package; 16 leads (300 mil) SOT38-4
1991 Feb 08
6
Page 7
Philips Semiconductors Product specification
74ALS2518–input multiplexer (3–State)
SO16: plastic small outline package; 16 leads; body width 3.9 mm SOT109-1
1991 Feb 08
7
Page 8
Philips Semiconductors Product specification
74ALS2518–input multiplexer (3–State)
DEFINITIONS
Data Sheet Identification Product Status Definition
Objective Specification
Preliminary Specification
Product Specification
Formative or in Design
Preproduction Product
Full Production
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 APPLICA TIONS
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.
Philips Semiconductors
811 East Arques Avenue
P.O. Box 3409
Sunnyvale, California 94088–3409
Telephone 800-234-7381
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 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.
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.
1991 Feb 08
8
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