INTEGRATED CIRCUITS 74ALS138 1-of-8 decoder/demultiplexer Product specification IC05 Data Handbook 1996 Jul 03 Philips Semiconductors Product specification 1-of-8 decoder/demultiplexer 74ALS138 FEATURES PIN CONFIGURATION • Demultiplexing capability • Multiple input enable for easy expansion • Ideal for memory chip select decoding A0 1 16 VCC A1 2 15 Q0 A2 3 14 Q1 DESCRIPTION E0 4 13 Q2 The 74ALS138 decoder accepts three binary weighted inputs (A0, A1, A2) and when enabled, provides eight mutually exclusive, active-Low outputs (Q0 – Q7). The device features three Enable inputs; two active-Low (E0, E1) and one active-High (E2). Every output will be High unless E0 and E1 are Low and E2 is High. This multiple enable function allows easy parallel expansion of the device to 1-of-32 (5 lines to 32 lines) decoder with just four 74ALS138s and one inverter. The device can be used as an eight output demultiplexer by using one of the active-Low Enable inputs as the data input and the remaining Enable inputs as strobes. Enable inputs not used must be permanently tied to their appropriate active-High or active-Low state. E1 5 12 Q3 E2 6 11 Q4 Q7 7 10 Q5 GND 8 9 Q6 TYPE SF00174 ORDERING INFORMATION ORDER CODE DESCRIPTION COMMERCIAL RANGE VCC = 5V ±10%, Tamb = 0°C to +70°C DRAWING NUMBER TYPICAL PROPAGATION DELAY TYPICAL SUPPLY CURRENT (TOTAL) 16-pin plastic DIP 74ALS138N SOT38-4 12.0ns 4.0mA 16-pin plastic SO 74ALS138D SOT109-1 74ALS138 INPUT AND OUTPUT LOADING AND FAN-OUT TABLE PINS DESCRIPTION 74ALS (U.L.) HIGH/LOW LOAD VALUE HIGH/LOW A0 – A2 Address inputs 1.0/1.0 20µA/0.1mA E0, E1 Enable inputs (active-Low) 1.0/1.0 20µA/0.1mA E2 Enable input (active-High) 1.0/1.0 20µA/0.1mA Q0 – Q7 Data outputs (active-Low) 50/33 1.0mA/20mA 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 1 2 3 DX 1 2 G A0 A1 A2 4 E0 5 E1 6 E2 15 0 0 3 0 7 1 2 2 3 14 13 12 11 Q0 Q1 Q2 Q3 Q4 Q5 Q6 Q7 4 15 14 13 12 11 10 9 7 & 10 5 9 6 7 VCC = Pin 16 GND = Pin 8 SF00175 1996 Jul 03 SC00047 2 853–1848 17016 Philips Semiconductors Product specification 1-of-8 decoder/demultiplexer 74ALS138 LOGIC DIAGRAM A2 A1 A0 E0 E1 E2 3 2 1 4 5 6 15 14 13 12 11 10 9 Q1 Q2 Q3 Q4 Q5 Q6 Q0 VCC = Pin 16 GND = Pin 8 7 Q7 SF00177 FUNCTION TABLE INPUTS E0 OUTPUTS E1 E2 A0 A1 A2 Q0 Q1 Q2 Q3 Q4 Q5 Q6 Q7 H X X X X X H H H H H H H H X H X X X X H H H H H H H H X X L X X X H H H H H H H H L L H L L L L H H H H H H H L L H H L L H L H H H H H H L L H L H L H H L H H H H H L L H H H L H H H L H H H H L L H L L H H H H H L H H H L L H H L H H H H H H L H H L L H L H H H H H H H H L H L L H H H H H H H H H H H L H = High voltage level L = Low voltage level X = Don’t care 1996 Jul 03 3 Philips Semiconductors Product specification 1-of-8 decoder/demultiplexer 74ALS138 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.) PARAMETER SYMBOL RATING UNIT VCC Supply voltage –0.5 to +7.0 V VIN Input voltage –0.5 to +7.0 V IIN Input current –30 to +5 mA –0.5 to VCC V VOUT Voltage applied to output in High output state IOUT Current applied to output in Low output state Tamb Operating free-air temperature range Tstg Storage temperature range 16 mA 0 to +70 °C –65 to +150 °C RECOMMENDED OPERATING CONDITIONS LIMITS SYMBOL PARAMETER UNIT MIN NOM MAX 5.0 5.5 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 –0.4 mA IOL Low-level output current 8 mA +70 °C Tamb Operating free-air temperature range V V 0 DC ELECTRICAL CHARACTERISTICS (Over recommended operating free-air temperature range unless otherwise noted.) SYMBOL PARAMETER LIMITS TEST CONDITIONS1 MIN VOH High-level output voltage VCC = ±10%, VIL = MAX, VIH = MIN VOL O Low level output voltage Low-level VCC = MIN,, VIL = MAX,, VIH = MIN VIK Input clamp voltage VCC = MIN, II = IIK II Input current at maximum input voltage IIH IOH = –0.4mA TYP2 UNIT MAX VCC – 2 V IOL = 4mA 0.25 0.40 V IOL = 8mA 0.35 0.50 V –0.73 –1.5 V VCC = MAX, VI = 7.0V 0.1 mA High-level input current VCC = MAX, VI = 2.7V 20 µA IIL Low-level input current VCC = MAX, VI = 0.4V –0.1 mA IO Output current3 –112 mA ICC Supply current (total) 7 mA VCC = MAX, VO = 2.25V VCC = MAX –30 4 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. 1996 Jul 03 4 Philips Semiconductors Product specification 1-of-8 decoder/demultiplexer 74ALS138 AC ELECTRICAL CHARACTERISTICS LIMITS SYMBOL PARAMETER Tamb = 0°C to +70°C VCC = +5.0V ± 10% CL = 50pF, RL = 500Ω TEST CONDITION MIN MAX UNIT tPLH tPHL Propagation delay An to Qn Waveform 1, 2 3.0 3.0 22.0 18.0 ns tPLH tPHL Propagation delay E1, E2 to Qn Waveform 2 3.0 3.0 17.0 17.0 ns tPLH tPHL Propagation delay E2 to Qn Waveform 1 3.0 3.0 17.0 17.0 ns AC WAVEFORMS For all waveforms, VM = 1.3V. An, E2 VM tPHL tPLH VM Qn VM An, E0, E1 VM VM tPHL VM tPLH VM Qn VM SF00179 SF00180 Waveform 1. Propagation Delay for Inverting Outputs Waveform 2. Propagation Delay for Non-inverting Outputs TEST CIRCUIT AND WAVEFORMS VCC VIN CL RL AMP (V) VM 10% D.U.T. RT 90% VM VOUT PULSE GENERATOR tw 90% NEGATIVE PULSE 10% tTHL (tff) tTLH (tr ) tTLH (tr ) tTHL (tf ) 0.3V AMP (V) 90% Test Circuit for Totem-pole Outputs POSITIVE PULSE 90% VM VM 10% 10% tw 0.3V Input Pulse Definition 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. INPUT PULSE REQUIREMENTS Family Amplitude VM 74ALS 3.5V 1.3V Rep.Rate tw tTLH tTHL 1MHz 500ns 2.0ns 2.0ns SC00005 1996 Jul 03 5 Philips Semiconductors Product specification 1-of-8 decoder/demultiplexer 74ALS138 DIP16: plastic dual in-line package; 16 leads (300 mil) 1996 Jul 03 6 SOT38-4 Philips Semiconductors Product specification 1-of-8 decoder/demultiplexer 74ALS138 SO16: plastic small outline package; 16 leads; body width 3.9 mm 1996 Jul 03 7 SOT109-1 Philips Semiconductors Product specification 1-of-8 decoder/demultiplexer 74ALS138 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 1996 Jul 03 8