INTEGRATED CIRCUITS 74ALS251 8–input multiplexer (3–State) Product specification IC05 Data Handbook 1991 Feb 08 Philips Semiconductors Product specification 8-input multiplexer (3-State) 74ALS251 FEATURES PIN CONFIGURATION • 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. TYPICAL SUPPLY CURRENT (TOTAL) 7.0ns 7.5mA 74ALS251 16 VCC 2 15 I4 I1 3 14 I5 I0 4 13 I6 Y 5 12 I7 Y 6 11 S0 OE 7 10 S1 GND 8 9 S2 ORDERING INFORMATION 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 PROPAGATION DELAY 1 SC00066 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. TYPE I3 I2 ORDER CODE DESCRIPTION COMMERCIAL RANGE VCC = 5V ±10%, Tamb = 0°C to +70°C DRAWING NUMBER 16-pin plastic DIP 74ALS251N SOT38-4 16-pin plastic SO 74ALS251D SOT109-1 INPUT AND OUTPUT LOADING AND FAN-OUT TABLE 74ALS (U.L.) HIGH/LOW LOAD VALUE HIGH/LOW Data inputs 1.0/1.0 20µA/0.1mA Select inputs 1.0/1.0 20µA/0.1mA PINS DESCRIPTION I0 – I7 S0 – S2 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 IEC/IEEE SYMBOL 7 4 3 2 1 15 14 13 EN 12 MUX 11 0 10 I0 I1 I2 I3 I4 I5 I6 G 9 I7 0 7 5 2 11 S0 4 10 S1 3 9 S2 2 7 OE 1 6 Y Y 15 14 5 VCC = Pin 16 GND = Pin 8 1991 Feb 08 13 6 12 SC00067 SC00068 2 853–1377 01670 Philips Semiconductors Product specification 8-input multiplexer (3-State) 74ALS251 LOGIC DIAGRAM FUNCTION TABLE I0 I1 4 S2 S1 S0 OE I2 3 I3 2 I4 1 I5 15 I6 14 INPUTS I7 13 12 OUTPUTS S2 S1 S0 OE Y Y 9 X X X H Z Z 10 L L L L I0 I0 11 L L H L I1 I1 7 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 L I7 I7 H 5 VCC = Pin 16 GND = Pin 8 Y H L X Z 6 Y = = = = High voltage level Low voltage level Don’t care High impedance “off” state 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.) RATING UNIT VCC Supply voltage PARAMETER –0.5 to +7.0 V VIN Input voltage –0.5 to +7.0 V IIN Input current –30 to +5 mA SYMBOL VOUT Voltage applied to output in High output state –0.5 to VCC V IOUT Current applied to output in Low output state 48 mA Tamb Operating free-air temperature range 0 to +70 °C Tstg Storage temperature range –65 to +150 °C RECOMMENDED OPERATING CONDITIONS LIMITS SYMBOL PARAMETER MIN NOM MAX 5.0 5.5 UNIT VCC Supply voltage 4.5 VIH High-level input voltage 2.0 VIL Low-level input voltage 0.8 V IIK Input clamp current –18 mA IOH High-level output current –2.6 mA IOL Low-level output current 24 mA +70 °C Tamb 1991 Feb 08 Operating free-air temperature range 0 3 V V Philips Semiconductors Product specification 8-input multiplexer (3-State) 74ALS251 DC ELECTRICAL CHARACTERISTICS (Over recommended operating free-air temperature range unless otherwise noted.) SYMBOL VOH O TEST CONDITIONS1 PARAMETER High level output voltage High-level LIMITS MIN VCC±10%,, VIL = MAX,, VIH = MIN IOH = –0.4mA VCC – 2 IOH = –2.6mA 2.4 IOL = 12mA VOL O Low level output voltage Low-level VCC = MIN,, VIL = MAX,, VIH = MIN VIK Input clamp voltage VCC = MIN, II = IIK IOL = 24mA TYP2 MAX UNIT V 3.2 V 0.25 0.40 V 0.35 0.50 V –0.73 –1.5 V II Input current at maximum input voltage VCC = MAX, VI = 7.0V 0.1 mA IIH High-level input current VCC = MAX, VI = 2.7V 20 µA IIL Low-level input current VCC = MAX, VI = 0.4V –0.1 mA IOZH Off-state output current, High-level voltage applied VCC = MAX, VI = 2.7V 20 µA IOZL Off-state output current, Low-level voltage applied VCC = MAX, VI = 0.4V –20 µA IO Output current3 VCC = MAX, VO = 2.25V –112 mA 7.0 10 mA ICC Supply current (total) 9.0 14 mA ICC ICCZ –30 VCC = MAX 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 = 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, IOS. AC ELECTRICAL CHARACTERISTICS LIMITS SYMBOL PARAMETER TEST CONDITION Tamb = 0°C to +70°C VCC = +5.0V ± 10% CL = 50pF, RL = 500Ω MIN MAX UNIT tPLH tPHL Propagation delay In to Y Waveform 2 4.0 4.0 12.0 12.0 ns tPLH tPHL Propagation delay In to Y Waveform 1 3.0 6.0 10.0 15.0 ns tPLH tPHL Propagation delay Sn to Y Waveform 1, 2 5.0 7.0 15.0 16.0 ns tPLH tPHL Propagation delay Sn to Y Waveform 1, 2 8.0 5.0 17.0 15.0 ns tPZH tPZL Propagation delay OE to Y Waveform 3 Waveform 4 2.0 3.0 8.0 9.0 ns tPHZ tPLZ Propagation delay OE to Y Waveform 3 Waveform 4 2.0 1.0 8.0 7.0 ns tPZH tPZL Propagation delay OE to Y Waveform 3 Waveform 4 2.0 3.0 8.0 9.0 ns tPHZ tPLZ Propagation delay OE to Y Waveform 3 Waveform 4 2.0 1.0 8.0 7.0 ns 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 VOUT VM VM tPLH tPLH VM VM VM tPHL VM VOUT VM SF00093 SF00092 Waveform 1. Propagation Delay for Inverting Output OE VM Waveform 2. Propagation Delay for Non-inverting Output OE VM tPZH VM VOH -0.3V tPHZ VM tPZL tPLZ 3.5V Y, Y Y, Y VM VM 0V VOL +0.3V SC00071 SC00070 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 VIN VOUT PULSE GENERATOR tw 90% NEGATIVE PULSE 10% RL CL RL AMP (V) VM VM D.U.T. RT 90% 10% tTHL (tff) tTLH (tr ) tTLH (tr ) tTHL (tf ) 0.3V AMP (V) 90% Test Circuit for 3-State Outputs POSITIVE PULSE VM VM 10% 10% tw SWITCH POSITION TEST SWITCH closed tPLZ, tPZL All other 90% 0.3V Input Pulse Definition open INPUT PULSE REQUIREMENTS Family Amplitude VM 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. 74ALS 3.5V 1.3V Rep.Rate tw tTLH tTHL 1MHz 500ns 2.0ns 2.0ns 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) 1991 Feb 08 6 SOT38-4 Philips Semiconductors Product specification 8–input multiplexer (3–State) 74ALS251 SO16: plastic small outline package; 16 leads; body width 3.9 mm 1991 Feb 08 7 SOT109-1 Philips Semiconductors Product specification 8–input multiplexer (3–State) 74ALS251 DEFINITIONS Data Sheet Identification Product Status Definition Objective Specification Formative or in Design This data sheet contains the design target or goal specifications for product development. Specifications may change in any manner without notice. Preliminary Specification Preproduction Product 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. Product Specification Full Production 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. 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. Copyright Philips Electronics North America Corporation 1997 All rights reserved. Printed in U.S.A. Philips Semiconductors 811 East Arques Avenue P.O. Box 3409 Sunnyvale, California 94088–3409 Telephone 800-234-7381 1991 Feb 08 8