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| HD74AC538 1-of-8 Decoder with 3-State Output Description The HD74AC538 decoder/demultiplexer accepts three Address (A0 to A2) input signal and decodes them to select one of eight mutually exclusive outputs. A polarity control input (P) determines whether the outputs are active LOW or active HIGH. A HIGH signal on either of the active LOW output Enable (OE) inputs forces all outputs to the high impedance state. Two active HIGH and two active LOW input enables are available for easy expansion to 1-of-32 decoding with four packages, or for data demultiplexing to 1-of8 or 1-of-16 destinations. Features * * * * Output Polarity Control Data Demultiplexing Capability Multiple Enables for Expansion Outputs Source/Sink 24 mA HD74AC538 Pin Arrangement O2 1 O1 2 O0 3 OE1 4 OE2 5 A0 6 A1 7 O5 8 O6 9 GND 10 (Top view) 20 VCC 19 O3 18 O4 17 A2 16 E1 15 E2 14 E3 13 E4 12 P 11 O7 Logic Symbol P E1 E2 E3 E4 OE1 A0 A1 A2 OE2 O0 O1 O2 O3 O4 O5 O6 O7 2 HD74AC538 Pin Names A0 to A2 E1, E2 E3, E4 P OE1, OE2 O0 to O7 Address Inputs Enable Inputs (Active LOW) Enable Inputs (Active HIGH) Polarity Control Input Output Enable Inputs (Active LOW) 3-State Outputs Logic Diagram A2 A1 A0 E1 E2 E3 E4 P OE1 OE2 O0 O1 O2 O3 O4 O5 O6 O7 3 HD74AC538 Truth Table Inputs Function High impedance OE1 OE2 E1 H Z Disable L L L L Active HIGH output (P = L) L L L L L L L L Active LOW output (P = L) L L L L L L L L H L X Z : : : : High Voltage Level Low Voltage Level Immaterial High Impedance X H L L L L L L L L L L L L L L L L L L L L X X H X X X L L L L L L L L L L L L L L L L E2 X X X H X X L L L L L L L L L L L L L L L L E3 X X X X L X H H H H H H H H H H H H H H H H E4 X X X X X L H H H H H H H H H H H H H H H H A2 X X X X X X L L L L H H H H L L L L H H H H A1 X X X X X X L L H H L L H H L L H H L L H H A0 X X X X X X L H L H L H L H L H L H L H L H H L L L L L L L L H H H H H H H L H L L L L L L H L H H H H H H L L H L L L L L H H L H H H H H L L L H L L L L H H H L H H H H L L L L H L L L H H H H L H H H L L L L L H L L H H H H H L H H L L L L L L H L H H H H H H L H L L L L L L L H H H H H H H H L Outputs O0 X Z O1 Z Z O2 Z Z O3 Z Z O4 Z Z O5 Z Z O6 Z Z O7 Z Z Outputs equal input DC Characteristics (unless otherwise specified) Item Maximum quiescent supply current Maximum quiescent supply current Symbol I CC I CC Max 80 8.0 Unit A A Condition VIN = VCC or ground, VCC = 5.5 V, Ta = Worst case VIN = VCC or ground, VCC = 5.5 V, Ta = 25C 4 HD74AC538 AC Characteristics: HD74AC538 Ta = +25C CL = 50 pF Item Propagation delay An to O n Propagation delay An to O n Propagation delay E1, or E2 to O n Propagation delay E1, or E2 to O n Propagation delay E3, or E4 to O n Propagation delay E3, or E4 to O n Propagation delay P to O n Propagation delay P to O n Propagation delay OEn to O n Propagation delay OEn to O n Propagation delay OEn to O n Propagation delay OEn to O n Note: t PLZ t PHZ t PZL t PZH t PHL t PLH t PHL t PLH t PHL t PLH t PHL Symbol t PLH VCC (V)*1 3.3 5.0 3.3 5.0 3.3 5.0 3.3 5.0 3.3 5.0 3.3 5.0 3.3 5.0 3.3 5.0 3.3 5.0 3.3 5.0 3.3 5.0 3.3 5.0 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 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 10.5 8.0 9.5 7.0 11.0 8.0 10.0 8.0 11.0 8.5 10.5 8.0 10.5 9.0 9.0 7.5 7.0 5.0 8.5 5.5 7.0 6.0 9.0 7.0 Max 17.5 12.5 17.5 12.0 19.5 14.5 19.5 14.0 19.5 14.5 20.0 15.0 15.5 11.0 15.0 10.5 14.0 8.5 16.5 9.5 14.0 10.5 14.5 10.5 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 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 20.0 14.0 20.0 14.0 23.0 16.5 23.0 16.5 23.0 17.0 23.5 18.0 17.5 12.5 17.0 11.5 15.5 9.5 19.0 11.5 15.5 11.5 17.0 12.0 ns ns ns ns ns ns ns ns ns ns ns Unit ns 1. Voltage Range 3.3 is 3.3 V 0.3 V Voltage Range 5.0 is 5.0 V 0.5 V Capacitance Item Input capacitance Power dissipation capacitance Symbol CIN CPD Typ 4.5 100 Unit pF pF Condition VCC = 5.5 V VCC = 5.0 V 5 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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