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HD74AC245/HD74ACT245
Octal Bidirectional Transceiver with 3-State Input/Output
Description
The HD74AC245/HD74ACT245 contains eight non-inverting bidirectional buffers with 3-state outputs and is intended for bus-oriented applications. Current sinking capability is 24 mA at both the A and B ports. The Transmit/Receive (T/R) input determines the direction of data flow through the bidirectional transceiver. Transmit (active-High) enables data from A ports to B ports; Receive (active-Low) enables data from B ports to A ports. The Output Enable input, when High, disables, both A and B ports by placing them in a High Z condition.
Features
* * * * Noninverting Buffers Bidirectional Data Path A and B Outputs Source/Sink 24 mA HD74ACT245 has TTL-Compatible Inputs
Pin Names
OE T/R A0 to A7 B 0 to B7 Output Enable Input Transmit/Receive Input Side A 3-State Inputs or 3-State Outputs Side B 3-State Inputs or 3-State Outputs
HD74AC245/HD74ACT245
Pin Arrangement
T/R 1 A0 2 A1 3 A2 4 A3 5 A4 6 A5 7 A6 8 A7 9 GND 10 (Top view)
20 VCC 19 OE 18 B0 17 B1 16 B2 15 B3 14 B4 13 B5 12 B6 11 B7
Truth Tables
Inputs OE L L H H: L: X: High Voltage Level Low Voltage Level Immaterial T/R L H X Outputs Bus B Data to Bus A Bus A Data to Bus B High Z State
2
HD74AC245/HD74ACT245
DC Characteristics (unless otherwise specified)
Item Maximum quiescent supply current Maximum quiescent supply current Maximum additional ICC/input (HD74ACT245) Symbol I CC I CC I CCT Max 80 8.0 1.5 Unit A A mA Condition VIN = VCC or ground, VCC = 5.5 V, Ta = Worst case VIN = VCC or ground, VCC = 5.5 V, Ta = 25C VIN = VCC - 2.1 V, VCC = 5.5 V, Ta = Worst case
AC Characteristics: HD74AC245
Ta = +25C CL = 50 pF Item Propagation delay Data to output Propagation delay Data to output Output enable time t PZH t PHL Symbol t PLH VCC (V)*1 3.3 5.0 3.3 5.0 3.3 5.0 Output enable time t PZL 3.3 5.0 Output disable time t PHZ 3.3 5.0 Output disable time t PLZ 3.3 5.0 Note: 1. Voltage Range 3.3 is 3.3 V 0.3 V Voltage Range 5.0 is 5.0 V 0.5 V Min 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 Typ 5.0 3.5 5.0 3.5 7.0 5.0 7.5 5.5 6.5 5.5 7.0 5.5 Max 8.5 6.5 8.5 6.0 11.5 8.5 12.0 9.0 12.0 9.0 11.5 9.0 Ta = -40C to +85C CL = 50 pF Min 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 Max 9.0 7.0 9.0 7.0 12.5 9.0 13.5 9.5 12.5 10.0 13.0 10.0 ns ns ns ns ns Unit ns
3
HD74AC245/HD74ACT245
AC Characteristics: HD74ACT245
Ta = +25C CL = 50 pF Item Propagation delay Data to output Propagation delay Data to output Output enable time Output enable time Output disable time Output disable time Note: Symbol t PLH t PHL t PZH t PZL t PHZ t PLZ VCC (V)*1 5.0 5.0 5.0 5.0 5.0 5.0 Min 1.0 1.0 1.0 1.0 1.0 1.0 Typ 4.0 4.0 5.0 5.5 5.5 5.0 Max 7.5 8.0 10.0 10.0 10.0 10.0 Ta = -40C to +85C CL = 50 pF Min 1.0 1.0 1.0 1.0 1.0 1.0 Max 8.0 9.0 11.0 12.0 11.0 11.0 Unit ns ns ns ns ns ns
1. Voltage Range 5.0 is 5.0 V 0.5 V
Capacitance
Item Input capacitance Input/output capacitance Power dissipation capacitance Symbol CIN CI/O CPD Typ 4.5 15.0 45.0 Unit pF pF pF Condition VCC = 5.5 V VCC = 5.5 V VCC = 5.0 V
4
Unit: mm
24.50 25.40 Max 20 11 7.00 Max 6.30 1 0.89
1.27 Max
10 1.30 2.54 Min 5.08 Max 7.62
0.51 Min
2.54 0.25
0.48 0.10
0.25 - 0.05 0 - 15
+ 0.11
Hitachi Code JEDEC EIAJ Weight (reference value)
DP-20N -- Conforms 1.26 g
Unit: mm
12.6 13 Max
20
11
1
10
5.5
0.80 Max
2.20 Max
*0.22 0.05 0.20 0.04
0.20 7.80 + 0.30 -
1.15
0 - 8
0.70 0.20
1.27 *0.42 0.08 0.40 0.06
0.12 M
*Dimension including the plating thickness Base material dimension
0.10 0.10
0.15
Hitachi Code JEDEC EIAJ Weight (reference value)
FP-20DA -- Conforms 0.31 g
Unit: mm
12.8 13.2 Max 20 11 7.50 1 0.935 Max 10
2.65 Max
*0.27 0.05 0.25 0.04
0.25 10.40 + 0.40 -
1.45
0.20 0.10
0 - 8
0.57 0.70 + 0.30 -
1.27
*0.42 0.08 0.40 0.06
0.15 0.12 M
Hitachi Code JEDEC EIAJ Weight (reference value) FP-20DB Conforms -- 0.52 g
*Dimension including the plating thickness Base material dimension
Unit: mm
6.50 6.80 Max 20 11 4.40 1 10 0.65 0.20 0.06 *0.22+0.08 -0.07 0.13 M 0.65 Max *0.17 0.05 0.15 0.04 1.10 Max 0.07 +0.03 -0.04 0 - 8 0.50 0.10 1.0 6.40 0.20 0.10
*Dimension including the plating thickness Base material dimension
Hitachi Code JEDEC EIAJ Weight (reference value)
TTP-20DA -- -- 0.07 g
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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