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INTEGRATED CIRCUITS
74ALS251 8-input multiplexer (3-State)
Product specification IC05 Data Handbook 1991 Feb 08
Philips Semiconductors
Philips Semiconductors
Product specification
8-input multiplexer (3-State)
74ALS251
FEATURES
* 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) outputs are 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. TYPICAL SUPPLY CURRENT (TOTAL) 7.5mA
PIN CONFIGURATION
I3 I2 I1 I0 Y Y OE GND 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 VCC I4 I5 I6 I7 S0 S1 S2
SC00066
ORDERING INFORMATION
ORDER CODE DESCRIPTION COMMERCIAL RANGE VCC = 5V 10%, Tamb = 0C to +70C 74ALS251N 74ALS251D DRAWING NUMBER
TYPE 74ALS251
TYPICAL PROPAGATION DELAY 7.0ns
16-pin plastic DIP 16-pin plastic SO
SOT38-4 SOT109-1
INPUT AND OUTPUT LOADING AND FAN-OUT TABLE
PINS I0 - I7 S0 - S2 OE Y, Y Data inputs Select inputs Output Enable input (active-Low) Data outputs DESCRIPTION 74ALS (U.L.) HIGH/LOW 1.0/1.0 1.0/1.0 1.0/1.0 130/240 LOAD VALUE HIGH/LOW 20A/0.1mA 20A/0.1mA 20A/0.1mA 2.5mA/24mA
NOTE: One (1.0) ALS unit load is defined as: 20A in the High state and 0.1mA in the Low state.
LOGIC SYMBOL
4 3 2 1 15 14 13 12
IEC/IEEE SYMBOL
7 EN 11 0 10 I0 I1 I2 I3 I4 I5 I6 I7 9 2 4 3 2 1 6 Y Y 15 14 5 6 13 12 G 0 7 5
MUX
11 10 9 7
S0 S1 S2 OE
VCC = Pin 16 GND = Pin 8
SC00067
SC00068
1991 Feb 08
2
853-1377 01670
Philips Semiconductors
Product specification
8-input multiplexer (3-State)
74ALS251
LOGIC DIAGRAM
I0 4 9 10 11 7 I1 3 I2 2 I3 1 I4 15 I5 14 I6 13 I7 12
FUNCTION TABLE
INPUTS S2 X L L L L H H H H H L X Z
SC00069
OUTPUTS S0 X L H L H L H L H OE H L L L L L L L L Y Z I0 I1 I2 I3 I4 I5 I6 I7 Y Z I0 I1 I2 I3 I4 I5 I6 I7
S1 X L L H H L L H H
S2 S1 S0 OE
5 VCC = Pin 16 GND = Pin 8 Y Y
6
= = = =
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 VCC VIN IIN VOUT IOUT Tamb Tstg 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 VCC 48 0 to +70 -65 to +150 UNIT V V mA V mA C C
RECOMMENDED OPERATING CONDITIONS
LIMITS SYMBOL VCC VIH VIL IIK IOH IOL Tamb 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
8-input multiplexer (3-State)
74ALS251
DC ELECTRICAL CHARACTERISTICS
(Over recommended operating free-air temperature range unless otherwise noted.) SYMBOL PARAMETER TEST CONDITIONS1 VCC10%, VIL = MAX, , , VIH = MIN VCC = MIN, VIL = MAX, , , VIH = MIN VCC = MIN, II = IIK VCC = MAX, VI = 7.0V VCC = MAX, VI = 2.7V VCC = MAX, VI = 0.4V VCC = MAX, VI = 2.7V VCC = MAX, VI = 0.4V VCC = MAX, VO = 2.25V ICC ICCZ VCC = MAX -30 7.0 9.0 IOH = -0.4mA IOH = -2.6mA IOL = 12mA IOL = 24mA LIMITS MIN VCC - 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 10 14 TYP2 MAX UNIT V V V V V mA A mA A A mA mA mA
VO OH
High-level High level output voltage
VO OL VIK II IIH IIL IOZH IOZL IO ICC
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 current3 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 VCC = 5V, Tamb = 25C. 3. The output conditions have been chosen to produce a current that closely approximates one half of the true short-circuit output current, IOS.
AC ELECTRICAL CHARACTERISTICS
LIMITS SYMBOL PARAMETER TEST CONDITION Tamb = 0C to +70C VCC = +5.0V 10% CL = 50pF, RL = 500 MIN tPLH tPHL tPLH tPHL tPLH tPHL tPLH tPHL tPZH tPZL tPHZ tPLZ tPZH tPZL tPHZ tPLZ 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 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 MAX 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 ns ns ns ns ns ns ns ns UNIT
1991 Feb 08
4
Philips Semiconductors
Product specification
8-input multiplexer (3-State)
74ALS251
AC WAVEFORMS
For all waveforms, VM = 1.3V.
VIN VIN VM tPHL VM tPLH VM tPLH
VM tPHL
VOUT
VM
VM
VOUT
VM
VM
SF00093
SF00092
Waveform 1. Propagation Delay for Inverting Output
Waveform 2. Propagation Delay for Non-inverting Output
OE
VM tPZH
VM tPHZ VM 0V VOH -0.3V
OE
VM tPZL
VM tPLZ 3.5V VM VOL +0.3V
Y, Y
Y, Y
SC00070
SC00071
Waveform 3. 3-State Output Enable Time to High Level and Output Disable Time from High Level
Waveform 4. 3-State Output Enable Time to Low Level and Output Disable Time from Low Level
TEST CIRCUIT AND WAVEFORMS
VCC 7.0V NEGATIVE PULSE 90% VM 10% tTHL (tff) CL RL tw VM 10% tTLH (tr ) 0.3V 90% AMP (V)
VIN PULSE GENERATOR RT D.U.T.
VOUT
RL
tTLH (tr ) 90%
tTHL (tf ) AMP (V) 90% VM tw 10% 0.3V
Test Circuit for 3-State Outputs SWITCH POSITION TEST SWITCH closed tPLZ, tPZL All other open
POSITIVE PULSE 10%
VM
Input Pulse Definition INPUT PULSE REQUIREMENTS Family Amplitude VM 74ALS 3.5V 1.3V Rep.Rate 1MHz tw 500ns tTLH 2.0ns tTHL 2.0ns
DEFINITIONS: RL = Load resistor; see AC electrical characteristics for value. CL = Load capacitance includes jig and probe capacitance; see AC electrical characteristics for value. RT = Termination resistance should be equal to ZOUT of pulse generators.
SC00072
1991 Feb 08
5
Philips Semiconductors
Product specification
8-input multiplexer (3-State)
74ALS251
DIP16: plastic dual in-line package; 16 leads (300 mil)
SOT38-4
1991 Feb 08
6
Philips Semiconductors
Product specification
8-input multiplexer (3-State)
74ALS251
SO16: plastic small outline package; 16 leads; body width 3.9 mm
SOT109-1
1991 Feb 08
7
Philips Semiconductors
Product specification
8-input multiplexer (3-State)
74ALS251
DEFINITIONS
Data Sheet Identification
Objective Specification
Product Status
Formative or in Design
Definition
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.
Preliminary Specification
Preproduction Product
Product Specification
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 APPLICATIONS 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 (c) Copyright Philips Electronics North America Corporation 1997 All rights reserved. Printed in U.S.A.
Philips Semiconductors
1991 Feb 08 8

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