HD74AC538 1-of-8 Decoder with 3-State Output ADE-205-397 (Z) 1st. Edition Sep. 2000 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 20 VCC O1 2 19 O3 O0 3 18 O4 OE1 4 17 A2 OE2 5 16 E1 A0 6 15 E2 A1 7 14 E3 O5 8 13 E4 O6 9 12 P 11 O7 GND 10 (Top view) Logic Symbol P A0 A1 A2 E1 E2 E3 E4 OE1 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 Outputs Function OE1 OE2 E1 E2 E3 E4 A2 A1 A0 O0 O1 O2 O3 O4 O5 O6 O7 High impedance H X X X X X X X X X Z Z Z Z Z Z Z Z H X X X X X X X Z Z Z Z Z Z Z Z L L H X X X X X X Outputs equal input L L X H X X X X X L L X X L X X X X L L X X X L X X X Active HIGH output L L L L H H L L L H L L L L L L L (P = L) L L L L H H L L H L H L L L L L L L L L L H H L H L L L H L L L L L L L L L H H L H H L L L H L L L L L L L L H H H L L L L L L H L L L L L L L H H H L H L L L L L H L L L L L L H H H H L L L L L L L H L L L L L H H H H H L L L L L L L H Active LOW output L L L L H H L L L L H H H H H H H (P = L) L L L L H H L L H H L H H H H H H L L L L H H L H L H H L H H H H H L L L L H H L H H H H H L H H H H L L L L H H H L L H H H H L H H H L L L L H H H L H H H H H H L H H L L L L H H H H L H H H H H H L H L L L L H H H H H H H H H H H H L Disable H L X Z : : : : High Voltage Level Low Voltage Level Immaterial High Impedance DC Characteristics (unless otherwise specified) Item Symbol Max Unit Condition Maximum quiescent supply current I CC 80 A VIN = VCC or ground, VCC = 5.5 V, Ta = Worst case Maximum quiescent supply current I CC 8.0 A VIN = VCC or ground, VCC = 5.5 V, Ta = 25C 4 HD74AC538 AC Characteristics: HD74AC538 Ta = +25C CL = 50 pF Ta = -40C to +85C CL = 50 pF Item Symbol VCC (V)*1 Min Typ Max Min Max Unit Propagation delay t PLH 3.3 1.0 10.5 17.5 1.0 20.0 ns 5.0 1.0 8.0 12.5 1.0 14.0 3.3 1.0 9.5 17.5 1.0 20.0 5.0 1.0 7.0 12.0 1.0 14.0 3.3 1.0 11.0 19.5 1.0 23.0 5.0 1.0 8.0 14.5 1.0 16.5 3.3 1.0 10.0 19.5 1.0 23.0 5.0 1.0 8.0 14.5 1.0 16.5 3.3 1.0 11.0 19.5 1.0 23.0 5.0 1.0 8.5 14.5 1.0 17.0 3.3 1.0 10.5 20.0 1.0 23.5 5.0 1.0 8.0 15.0 1.0 18.0 3.3 1.0 10.5 15.5 1.0 17.5 5.0 1.0 9.0 11.0 1.0 12.5 3.3 1.0 9.0 15.0 1.0 17.0 5.0 1.0 7.5 10.5 1.0 11.5 3.3 1.0 7.0 14.0 1.0 15.5 5.0 1.0 5.0 8.5 1.0 9.5 3.3 1.0 8.5 16.5 1.0 19.0 5.0 1.0 5.5 9.5 1.0 11.5 3.3 1.0 7.0 14.0 1.0 15.5 5.0 1.0 6.0 10.5 1.0 11.5 3.3 1.0 9.0 14.5 1.0 17.0 5.0 1.0 7.0 10.5 1.0 12.0 An to O n Propagation delay t PHL An to O n Propagation delay t PLH E1, or E2 to O n Propagation delay t PHL E1, or E2 to O n Propagation delay t PLH E3, or E4 to O n Propagation delay t PHL E3, or E4 to O n Propagation delay t PLH P to O n Propagation delay t PHL P to O n Propagation delay t PZH OEn to O n Propagation delay t PZL OEn to O n Propagation delay t PHZ OEn to O n Propagation delay t PLZ OEn to O n Note: ns ns ns ns ns ns ns ns ns ns 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 Symbol Typ Unit Condition Input capacitance CIN 4.5 pF VCC = 5.5 V Power dissipation capacitance CPD 100 pF VCC = 5.0 V 5 HD74AC538 Package Dimensions Unit: mm 24.50 25.40 Max 1 7.00 Max 11 6.30 20 10 1.30 2.54 0.25 0.48 0.10 0.51 Min 1.27 Max 7.62 2.54 Min 5.08 Max 0.89 + 0.11 0.25 - 0.05 0 - 15 Hitachi Code JEDEC EIAJ Mass (reference value) DP-20N -- Conforms 1.26 g Unit: mm 12.6 13 Max 11 1 10 1.27 *0.42 0.08 0.40 0.06 0.10 0.10 0.80 Max *0.22 0.05 0.20 0.04 2.20 Max 5.5 20 0.20 7.80 +- 0.30 1.15 0 - 8 0.70 0.20 0.15 0.12 M *Dimension including the plating thickness Base material dimension 6 Hitachi Code JEDEC EIAJ Mass (reference value) FP-20DA -- Conforms 0.31 g HD74AC538 Unit: mm 12.8 13.2 Max 11 1 10 0.20 0.10 0.935 Max *0.27 0.05 0.25 0.04 2.65 Max 7.50 20 1.27 *0.42 0.08 0.40 0.06 0.25 10.40 +- 0.40 1.45 0 - 8 0.57 0.70 +- 0.30 0.15 0.12 M Hitachi Code JEDEC EIAJ Mass (reference value) *Dimension including the plating thickness Base material dimension FP-20DB Conforms -- 0.52 g Unit: mm 6.50 6.80 Max 11 1 10 4.40 20 0.65 *0.22+0.08 -0.07 0.20 0.06 1.0 0.13 M 6.40 0.20 *Dimension including the plating thickness Base material dimension 0.07 +0.03 -0.04 0.10 *0.17 0.05 0.15 0.04 1.10 Max 0.65 Max 0 - 8 0.50 0.10 Hitachi Code JEDEC EIAJ Mass (reference value) TTP-20DA -- -- 0.07 g 7 HD74AC538 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. 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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. 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(Taipei Branch Office) 4/F, No. 167, Tun Hwa North Road, Hung-Kuo Building, Taipei (105), Taiwan Tel : <886>-(2)-2718-3666 Fax : <886>-(2)-2718-8180 Telex : 23222 HAS-TP URL : http://www.hitachi.com.tw 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 URL : http://www.hitachi.com.hk Copyright Hitachi, Ltd., 2000. All rights reserved. Printed in Japan. Colophon 2.0 8