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| HD74BC245A Octal Bus Transceivers With 3 State Outputs ADE-205-008A (Z) Rev. 1 March 1993 Description The HD74BC245A provides high drivability and operation equal to or better than high speed bipolar standard logic IC by using Bi-CMOS process. The device features low power dissipation that is about 1/5 of high speed bipolar logic IC, when the frequency is 10 MHz. The device has ten buffers with three state outputs in a 20 pin package. Each device has an active low enable input G and a direction control input DiR. When DiR is high, data flows from the A inputs to the B outputs. When DiR is low, data flows from the B inputs to the A outputs. When G is high, disables both A and B ports by placing then in a high impedance. Features * * * * Input/Output are at high impedance state when power supply is off. Built in input pull up circuit can make input pins be open, when not used. TTL level input Wide operating temperature range Ta = -40 to + 85C Function Table Control Inputs G L L H H: L: Z: High level Low level High impedance DiR L H X Operation B data to A bus A data to B bus Z HD74BC245A Pin Arrangement DiR A1 A2 A3 A4 A5 A6 A7 A8 GND 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 VCC G B1 B2 B3 B4 B5 B6 B7 B8 (Top view) Absolute Maximum Ratings Item Supply voltage Input diode current Input voltage Output voltage Off state output voltage Storage temperature Note: Symbol VCC I IK VIN VOUT VOUT(off) Tstg Rating -0.5 to +7.0 30 -0.5 to +7.5 -0.5 to +7.5 -0.5 to +5.5 -65 to +150 Unit V mA V V V C 1. The absolute maximum ratings are values which must not individually be exceeded, and furthermore, no two of which may be realized at the same time. 2 HD74BC245A Recommended Operating Conditions Item Supply voltage Input voltage Output voltage Operating temperature Input rise/fall time* Note: 1 Symbol VCC VIN VOUT Topr t r, t f Min 4.5 0 0 -40 0 Typ 5.0 -- -- -- -- Max 5.5 VCC VCC 85 8 Unit V V V C ns/V 1. This item guarantees maximum limit when one input switches. Waveform: Refer to test circuit of switching characteristics. Logic Diagram DiR G B1 B2 B3 B4 B5 B6 B7 B8 A1 A2 A3 A4 A5 A6 A7 A8 3 HD74BC245A Electrical Characteristics (Ta = -40C to +85C) Item Input voltage Symbol VIH VIL Output voltage VOH 4.5 4.5 VOL 4.5 4.5 Input diode voltage Input current VIK II 4.5 5.5 5.5 5.5 5.5 Short circuit output current* Off state output current 1 VCC(V) Min 2.0 -- 2.4 2.0 -- -- -- -- -- -- -- -100 -- -- -- -- -- -- Max -- 0.8 -- -- 0.5 0.55 -1.2 -250 100 1.0 100 -225 -100 -250 31.5 0.5 4.5 1.5 Unit V V V V V V V A A A A mA A A mA mA mA mA Test Conditions I OH = -3 mA I OH = -15 mA I OL = 48 mA I OL = 64 mA I IN = -18 mA VIN = 0 V An or Bn, VIN = 5.5 V DiR or G, VIN = 5.5 V DiR or G, VIN = 7.0 V VO = 0 V, VIN = 5.5 V VO = 2.7 V VO = 0.5 V VIN = 0 or 5.5 V All outputs is "L" VIN = 0 or 5.5 V All outputs is "H" VIN = 0 or 5.5 V All outputs is "Z" VIN = 3.4 or 0.5 V I OS I OZH I OZL 5.5 5.5 5.5 5.5 5.5 5.5 5.5 Supply current I CCL I CCH I CCZ I CCT*2 Notes : 1. Not more than one output should be shorted at a time and duration of the short circuit should not exceed one second. 2. When input by the TTL level, it shows I CC increase at per one input pin. 4 HD74BC245A Switching Test Method (CL = 50 pF) Ta = 25C VCC = 5.0 V Item Propagation delay time Symbol t PLH t PHL t PLH t PHL Output enable time t ZH t ZL t ZH t ZL Output disable time t HZ t LZ t HZ t LZ Input capacitanse Output capacitance CIN CI/O Min 3.0 3.0 3.0 3.0 3.0 3.0 3.0 3.0 3.0 3.0 3.0 3.0 3.0(Typ) 15.0(Typ) Max 6.0 6.0 6.0 6.0 9.0 9.0 9.0 9.0 8.0 8.0 8.0 8.0 Ta = -40 to 85C VCC = 5.0 V 10% Min 3.0 3.0 3.0 3.0 3.0 3.0 3.0 3.0 3.0 3.0 3.0 3.0 -- -- Max 7.0 7.0 7.0 7.0 11.0 11.0 11.0 11.0 10.0 10.0 10.0 10.0 pF pF VIN = VCC or GND VI/O = VCC or GND ns G to An ns G to Bn ns G to An ns G to Bn ns Bn to An Unit ns Test Conditions An to Bn Test Circuit VCC G Output VCC See Function Table Input Pulse Generator Zout = 50 A1 B1 DiR S1 500 CL= 50 pF 450 50 Scope *4 OPEN 7V Notes: 1. 2. 3. 4. CL includes probe and jig capacitance. A2-B2, A3-B3, A4-B4, A5-B5, A6-B6, A7-B7, A8-B8 are identical to above load circuit. S1: Input-Output change switch. Open: tPLH, t PHL , t ZH , t HZ 7 V: t ZL, t LZ 5 HD74BC245A Waveforms-1 tr 90% Input 1.5 V 10% t PLH 90% 1.5 V 10% t PHL VOH Output 1.5 V 1.5 V VOL 0V tf 3V Waveforms-2 tf 90% 1.5 V 10% t ZL tr 90% 1.5 V 10% t LZ 3.5 V 3V G 0V Waveform-A t ZH 1.5 V VOL + 0.3 V t HZ VOH VOL VOH - 0.3 V Waveform-B 1.5 V 0V Notes: 1. 2. 3. 4. t r = 2.5 ns, tf = 2.5 ns Input waveform: PRR = 1 MHz, duty cycle 50% Waveform-A shows input conditions such that the output is "L" level when enable by the output control. Waveform-B shows input conditions such that the output is "H" level when enable by the output control. 6 HD74BC245A Package Dimensions Unit: mm 7 Cautions 1. Hitachi neither warrants nor grants licenses of any rights of Hitachi's or any third party's patent, copyright, trademark, or other intellectual property rights for information contained in this document. Hitachi bears no responsibility for problems that may arise with third party's rights, including intellectual property rights, in connection with use of the information contained in this document. 2. Products and product specifications may be subject to change without notice. Confirm that you have received the latest product standards or specifications before final design, purchase or use. 3. Hitachi makes every attempt to ensure that its products are of high quality and reliability. However, contact Hitachi's sales office before using the product in an application that demands especially high quality and reliability or where its failure or malfunction may directly threaten human life or cause risk of bodily injury, such as aerospace, aeronautics, nuclear power, combustion control, transportation, traffic, safety equipment or medical equipment for life support. 4. Design your application so that the product is used within the ranges guaranteed by Hitachi particularly for maximum rating, operating supply voltage range, heat radiation characteristics, installation conditions and other characteristics. Hitachi bears no responsibility for failure or damage when used beyond the guaranteed ranges. Even within the guaranteed ranges, consider normally foreseeable failure rates or failure modes in semiconductor devices and employ systemic measures such as failsafes, so that the equipment incorporating Hitachi product does not cause bodily injury, fire or other consequential damage due to operation of the Hitachi product. 5. This product is not designed to be radiation resistant. 6. No one is permitted to reproduce or duplicate, in any form, the whole or part of this document without written approval from Hitachi. 7. Contact Hitachi's sales office for any questions regarding this document or Hitachi semiconductor products. Hitachi, Ltd. Semiconductor & Integrated Circuits. Nippon Bldg., 2-6-2, Ohte-machi, Chiyoda-ku, Tokyo 100-0004, Japan Tel: Tokyo (03) 3270-2111 Fax: (03) 3270-5109 URL NorthAmerica : http:semiconductor.hitachi.com/ Europe : http://www.hitachi-eu.com/hel/ecg Asia (Singapore) : http://www.has.hitachi.com.sg/grp3/sicd/index.htm Asia (Taiwan) : http://www.hitachi.com.tw/E/Product/SICD_Frame.htm Asia (HongKong) : http://www.hitachi.com.hk/eng/bo/grp3/index.htm Japan : http://www.hitachi.co.jp/Sicd/indx.htm For further information write to: Hitachi Semiconductor (America) Inc. 179 East Tasman Drive, San Jose,CA 95134 Tel: <1> (408) 433-1990 Fax: <1>(408) 433-0223 Hitachi Europe GmbH Electronic components Group Dornacher Strae 3 D-85622 Feldkirchen, Munich Germany Tel: <49> (89) 9 9180-0 Fax: <49> (89) 9 29 30 00 Hitachi Europe Ltd. Electronic Components Group. Whitebrook Park Lower Cookham Road Maidenhead Berkshire SL6 8YA, United Kingdom Tel: <44> (1628) 585000 Fax: <44> (1628) 778322 Hitachi Asia Pte. Ltd. 16 Collyer Quay #20-00 Hitachi Tower Singapore 049318 Tel: 535-2100 Fax: 535-1533 Hitachi Asia Ltd. Taipei Branch Office 3F, Hung Kuo Building. No.167, Tun-Hwa North Road, Taipei (105) Tel: <886> (2) 2718-3666 Fax: <886> (2) 2718-8180 Hitachi Asia (Hong Kong) Ltd. Group III (Electronic Components) 7/F., North Tower, World Finance Centre, Harbour City, Canton Road, Tsim Sha Tsui, Kowloon, Hong Kong Tel: <852> (2) 735 9218 Fax: <852> (2) 730 0281 Telex: 40815 HITEC HX Copyright ' Hitachi, Ltd., 1999. All rights reserved. Printed in Japan. |
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