74ALS245A PHILIPS | Alldatasheet
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/C0109 /C0110 /C0114 74ALS245A/74ALS245A–1 Octal transceiver (3–State) Product specification IC05 Data Handbook
1991 Jun 03
Philips Semiconductors Product specification 74ALS245A/74ALS245A-1Octal transceiver (3-State)
21991 Jun 03 853–0011 02709
FEATURES
- Octal bidirectional bus interface
- 3-State buffer outputs sink 24mA and source 15mA
- Outputs are placed in high impedance state during power-off conditions
- The -1 version sinks 48mA
DESCRIPTION
The 74ALS245A is an octal transceiver featuring non-inverting 3-State bus compatible outputs in both transmit and receive directions. The device features an output enable (OE ) input for easy cascading and transmit/receive (R/T) input for direction control. The 74ALS245A-1 is the same as the 74ALS245A except that both ports sink 48mA within the ±5% V CC range. TYPE TYPICAL PROPAGATION DELAY TYPICAL SUPPLY CURRENT (TOTAL) 74ALS245A 7.0ns 34mA 74ALS245A-1 7.0ns 34mA PIN CONFIGURATION SF00198 10 11 20T/R GND VCC OE
ORDERING INFORMATION
DESCRIPTION COMMERCIAL RANGE VCC = 5V ±10%, Tamb = 0°C to +70°C DRAWING NUMBER 20-pin plastic DIP 74ALS245AN, 74ALS245A-1N SOT146-1 20-pin plastic SOL 74ALS245AD, 744ALS245A-1D SOT163-1 20-pin plastic SSOP Type II 74ALS245ADB, 74ALS245A-1DB SOT339-1 INPUT AND OUTPUT LOADING AND FAN-OUT TABLE PINS DESCRIPTION 74ALS (U.L.) HIGH/LOW LOAD VALUE HIGH/LOW A0 – A7, B0 – B7 Data inputs 1.0/1.0 20µA/0.1mA OE Output Enable input (active-Low) 1.0/1.0 20µA/0.1mA T/R Transmit/receive input 1.0/1.0 20µA/0.1mA A0 – A7 A port outputs 750/240 15mA/24mA B0 – B7 B port outputs 750/240 15mA/24mA A0 – A7 A port outputs (-1 version) 750/480 15mA/48mA B0 – B7 B port 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.
Philips Semiconductors Product specification 74ALS245A/74ALS245A-1Octal transceiver (3-State)
1991 Jun 03 3
VCC = Pin 20 GND = Pin 10 SF00199 OE T/R A0 A1 A2 A3 A4 A5 567 B6 B7 12 11 A6 A7 IEC/IEEE SYMBOL SC00097 G319 3EN1 [BA] 1 3EN2 [AB] ∇ 1 2 ∇2 LOGIC DIAGRAM SF00201 A0 A1 A2 A3 A4 A5 A6 A7 23456789 OE T/R VCC = Pin 20 GND = Pin 10 FUNCTION TABLE INPUTS OUTPUTS OE T/R OUTPUTS L L Bus B data to Bus A L H Bus A data to Bus B H X Z H = High voltage level L = Low voltage level X = Don’t care Z = High impedance “off” state
Philips Semiconductors Product specification 74ALS245A/74ALS245A-1Octal transceiver (3-State)
1991 Jun 03 4
(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 C urrent 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 version 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 74ALS245A/74ALS245A-1Octal transceiver (3-State)
1991 Jun 03 5
DC ELECTRICAL CHARACTERISTICS (Over recommended operating free-air temperature range unless otherwise noted.) SYMBOL PARAMETER TEST CONDITIONS 1 LIMITS UNITSYMBOL PARAMETER TEST CONDITIONS 1 MIN TYP 2 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 versionsVCC = 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 I Input current at maxi-OE or T/R VCC = MAX, VI = 7.0V 0.1 mA II mum input voltage A or B portsVCC = MAX, VI = 5.5V 0.1 mA IIH High-level input current3 VCC = MAX, VI = 2.7V 20 µA IIL Low-level input current3 VCC = MAX, VI = 0.4V –0.1 mA IO Output current4 VCC = MAX, VO = 2.25V –30 –112 mA ICCH 28 45 mA ICC Supply current (total) ICCL VCC = MAX 40 55 mA ICCZ 44 58 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. For I/O ports, the parameter IIH and IIL include the off-state current. 4. 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% C L = 50pF, RL = 500Ω UNIT MIN MAX tPLH tPHL Propagation delay An to Bn, Bn to An Waveform 1 2.0 2.0 10.0 10.0 ns tPZH tPZL Output enable time to High or Low level Waveform 2 Waveform 3 3.0 3.0 20.0 20.0 ns tPHZ tPLZ Output disable time from High or Low level Waveform 2 Waveform 3 2.0 4.0 10.0 15.0 ns
Philips Semiconductors Product specification 74ALS245A/74ALS245A-1Octal transceiver (3-State)
1991 Jun 03 6
For all waveforms, VM = 1.3V. VM VM VM VM tPHLtPLH An, Bn Bn, An SC00096 Waveform 1. Propagation Delay for Non-inverting Outputs VM VM VM tPHZtPZH OE An, Bn VOH -0.3V SC00094 Waveform 2. 3-State Output Enable Time to High Level and Output Disable Time from High Level VM VM VM tPLZtPZL OE An, Bn VOL +0.3V SC00095 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 R LC LR T VIN VOUT Test Circuit for 3-State Outputs DEFINITIONS: R L = Load resistor; see AC electrical characteristics for value. C L = Load capacitance includes jig and probe capacitance; see AC electrical characteristics for value. R T = 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 R L 7.0V SWITCH POSITION TEST SWITCH tPLZ , tPZL closed All other open
Philips Semiconductors Product specification 74ALS245A/74ALS245A–1Octal transceiver (3–State)
1991 Jun 03 7
DIP20: plastic dual in-line package; 20 leads (300 mil) SOT146-1
Philips Semiconductors Product specification 74ALS245A/74ALS245A–1Octal transceiver (3–State)
1991 Jun 03 8
SO20: plastic small outline package; 20 leads; body width 7.5 mm SOT163-1
Philips Semiconductors Product specification 74ALS245A/74ALS245A–1Octal transceiver (3–State)
1991 Jun 03 9
SSOP20: plastic shrink small outline package; 20 leads; body width 5.3 mm SOT339-1
Philips Semiconductors Product specification 74ALS245A/74ALS245A–1Octal transceiver (3–State)
1991 Jun 03 10
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. /C0109 /C0110 /C0114