74ALS244A-1N_1332208

������� �� ��� ����� � 74ALS244A/74ALS244A–1 Octal buffer (3–State) Product specification IC05 Data Handbook 1991 Feb 08 INTEGRATED CIRCUITS Philips Semiconductors Product specification 74ALS244A/74ALS244A-1Octal buffer (3-State) 21991 Feb 08 853–1277 01670 FEATURES • Octal bus interface • 3-State buffer outputs sink 24mA and source 15mA • The -1 version sinks 48mA DESCRIPTION The 74ALS244A is an octal buffer that is ideal for driving bus lines or buffer memory address registers. The outputs are all capable of sinking 24mA and sourcing up to 15mA, producing very good capacitive drive characteristics. The device features two output enables, OEa and OEb, each controlling four of the 3-State outputs. The 74ALS244A-1 sinks 48 mA IOL if the VCC is limited to 5.0V ±0.25V. TYPE TYPICAL PROPAGATION DELAY TYPICAL SUPPLY CURRENT (TOTAL) 74ALS244A 4.5ns 17mA 74ALS244A-1 4.5ns 17mA PIN CONFIGURATION 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 VCCOEa Ia0 Yb0 Ia1 Yb1 Ia2 Yb2 Ia3 Yb3 GND SF00227 OEb Ya0 Ib0 Ya1 Ib1 Ya2 Ib2 Ya3 Ib3 ORDERING INFORMATION ORDER CODE DESCRIPTION COMMERCIAL RANGE VCC = 5V ±10%, Tamb = 0°C to +70°C DRAWING NUMBER 20-pin plastic DIP 74ALS244AN,74ALS244A-1N SOT146-1 20-pin plastic SOL 74ALS244AD,744ALS244A-1D SOT163-1 20-pin plastic SSOP Type II 74ALS244ADB, 74ALS244A-1DB SOT339-1 INPUT AND OUTPUT LOADING AND FAN-OUT TABLE PINS DESCRIPTION 74ALS (U.L.) HIGH/LOW LOAD VALUE HIGH/LOW Ian, Ibn Data inputs 1.0/1.0 20µA/0.1mA OEa, OEb Output Enable inputs (active-Low) 1.0/1.0 20µA/0.1mA Yan, Ybn Data outputs 750/240 15mA/24mA Yan, Ybn Data outputs (-1 version) 750/480 15mA/48mA NOTE: One (1.0) ALS unit load is defined as: 20µA in the High state and 0.1mA in the Low state. LOGIC SYMBOL OEa1 SF00228 2 4 6 8 17 15 13 11 18 16 14 12 3 5 7 9 Ia0 Ia1 Ia2 Ia3 Ib0 Ib1 Ib2 Ib3 Ya0 Ya1 Ya2 Ya3 Yb0 Yb1 Yb2 Yb3 VCC = Pin 20 GND = Pin 10 OEb19 IEC/IEEE SYMBOL 1 2D EN1 EN2 1 2 19 2 4 6 8 17 15 13 11 18 16 14 12 3 5 7 9 SF00229 Philips Semiconductors Product specification 74ALS244A/74ALS244A-1Octal buffer (3-State) 1991 Feb 08 3 LOGIC DIAGRAM VCC = Pin 20 Ia0 SF00230 OEa Ia3 Ia2 Ia1 2 4 6 8 1 Ya0 Ya1 Ya2 Ya3 18 16 14 12 Ib0 Ib1 Ib2 Ib3 OEb 17 15 13 11 19 3 5 7 9 Yb0 Yb1 Yb2 Yb3 GND = Pin 10 FUNCTION TABLE INPUTS OUTPUTS OEa Ia OEb Ib Ya Yb L L L L L L L H L H H H H X H X Z Z H = High voltage level L = Low voltage level X = Don’t care Z = 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 PARAMETER 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 VOUT Voltage applied to output in High output state –0.5 to VCC V IO Current applied to output in Low output state All versions 48 mA IOUT Current applied to output in Low output state -1 version 96 mA Tamb Operating free-air temperature range 0 to +70 °C Tstg Storage temperature range –65 to +150 °C RECOMMENDED OPERATING CONDITIONS SYMBOL PARAMETER LIMITS UNITSYMBOL PARAMETER MIN NOM MAX UNIT VCC Supply voltage 4.5 5.0 5.5 V VIH High-level input voltage 2.0 V VIL Low-level input voltage 0.8 V IIK Input clamp current –18 mA IOH High-level output current –15 mA IO Low level output current All versions 24 mA IOL Low-level output current -1 versions 481 mA Tamb Operating free-air temperature range 0 +70 °C NOTES: 1. The 48mA limit applies only under the condition of VCC = 5.0V ± 5%. Philips Semiconductors Product specification 74ALS244A/74ALS244A-1Octal buffer (3-State) 1991 Feb 08 4 DC ELECTRICAL CHARACTERISTICS (Over recommended operating free-air temperature range unless otherwise noted.) SYMBOL PARAMETER TEST CONDITIONS1 LIMITS UNITSYMBOL PARAMETER TEST CONDITIONS1 MIN TYP2 MAX UNIT VCC±10%, VIL = MAX, IOH = –0.4mA VCC – 2 V VOH High-level output voltage CC , IL , VIH = MIN IOH = –3mA 2.4 3.2 VVOH High level out ut voltage VCC = MIN, VIL = MAX, VIH = MIN IOH = –15mA 2.0 V All versions VCC = MIN, VIL = MAX, IOL = 12mA 0.25 0.40 V VOL Low-level output voltage All versions CC , IL ,VIH = MIN IOL = 24mA 0.35 0.50 VVOL Low level out ut voltage -1 version VCC = 4.75V, VIL = MAX,VIH = MIN IOL = 48mA 0.35 0.50 V VIK Input clamp voltage VCC = MIN, II = IIK –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 –30 –112 mA ICCH 6.5 15 mA ICC Supply current (total) ICCL VCC = MAX 19.5 24 mA ICCZ 25 30 mA 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 UNIT MIN MAX tPLH tPHL Propagation delay In to Yn Waveform 1 1.5 1.5 10.0 10.0 ns tPZH tPZL Output enable time to High or Low level Waveform 2 Waveform 3 1.0 2.5 10.0 12.0 ns tPHZ tPLZ Output disable time from High or Low level Waveform 2 Waveform 3 2.5 2.5 10.0 12.0 ns Philips Semiconductors Product specification 74ALS244A/74ALS244A-1Octal buffer (3-State) 1991 Feb 08 5 AC WAVEFORMS For all waveforms, VM = 1.3V. VMVM VMVM Yn Ian, Ibn tPLH tPHL SF00231 Waveform 1. Propagation Delay for Non-inverting Outputs VOH–0.3V VM VMVM Yn tPZH tPHZ SF00233 OEn 0V Waveform 2. 3-State Output Enable Time to High Level and Output Disable Time from High Level VOL+0.3V VM VMVM Yn tPZL tPLZ SF00234 OEn 3.5V Waveform 3. 3-State Output Enable Time to Low Level and Output Disable Time from Low Level TEST CIRCUIT AND WAVEFORMS tw 90% VM 10% 90% VM 10% 90% VM 10% 90% VM 10% NEGATIVE PULSE POSITIVE PULSE tw AMP (V) 0.3V 0.3V tTHL (tff) INPUT PULSE REQUIREMENTS Rep.Rate tw tTLH tTHL 1MHz 500ns 2.0ns 2.0ns Input Pulse Definition VCC Family 74ALS D.U.T.PULSE GENERATOR RLCLRT VIN VOUT Test Circuit for 3-State Outputs 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. tTHL (tf ) tTLH (tr ) tTLH (tr ) AMP (V) Amplitude 3.5V 1.3V VM SC00072 RL 7.0V SWITCH POSITION TEST SWITCH tPLZ, tPZL closed All other open Philips Semiconductors Product specification 74ALS244A/74ALS244–1Octal buffer (3–State) 1991 Feb 08 6 DIP20: plastic dual in-line package; 20 leads (300 mil) SOT146-1 Philips Semiconductors Product specification 74ALS244A/74ALS244–1Octal buffer (3–State) 1991 Feb 08 7 SO20: plastic small outline package; 20 leads; body width 7.5 mm SOT163-1 Philips Semiconductors Product specification 74ALS244A/74ALS244–1Octal buffer (3–State) 1991 Feb 08 8 SSOP20: plastic shrink small outline package; 20 leads; body width 5.3 mm SOT339-1 Philips Semiconductors Product specification 74ALS244A/74ALS244–1Octal buffer (3–State) 1991 Feb 08 9 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. 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. Philips Semiconductors 811 East Arques Avenue P.O. Box 3409 Sunnyvale, California 94088–3409 Telephone 800-234-7381 DEFINITIONS Data Sheet Identification Product Status Definition Objective Specification Preliminary Specification Product Specification Formative or in Design Preproduction Product Full Production 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 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. ������� �� ��� ����� �