HD74AC245/HD74ACT245 Octal Bi-directional Transceiver with 3-State Input/Output ADE-205-384 (Z) 1st. Edition Sep. 2000 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 Bi-directional 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 20 VCC A0 2 19 OE A1 3 18 B0 A2 4 17 B1 A3 5 16 B2 A4 6 15 B3 A5 7 14 B4 A6 8 13 B5 A7 9 12 B6 GND 10 11 B7 (Top view) Truth Tables Inputs OE T/R Outputs L L Bus B Data to Bus A L H Bus A Data to Bus B H X High Z State H : L : X : 2 High Voltage Level Low Voltage Level Immaterial HD74AC245/HD74ACT245 DC Characteristics (unless otherwise specified) Item Symbol Max Unit Condition Maximum quiescent supply current I CC 80 µA VIN = VCC or ground, VCC = 5.5 V, Ta = Worst case Maximum quiescent supply current I CC 8.0 µA VIN = VCC or ground, VCC = 5.5 V, Ta = 25°C Maximum additional ICC/input (HD74ACT245) I CCT 1.5 mA VIN = VCC – 2.1 V, VCC = 5.5 V, Ta = Worst case AC Characteristics: HD74AC245 Ta = +25°C CL = 50 pF Ta = –40°C to +85°C CL = 50 pF Item Symbol VCC (V)*1 Min Typ Max Min Max Unit Propagation delay t PLH 3.3 1.0 5.0 8.5 1.0 9.0 ns 5.0 1.0 3.5 6.5 1.0 7.0 3.3 1.0 5.0 8.5 1.0 9.0 5.0 1.0 3.5 6.0 1.0 7.0 3.3 1.0 7.0 11.5 1.0 12.5 5.0 1.0 5.0 8.5 1.0 9.0 3.3 1.0 7.5 12.0 1.0 13.5 5.0 1.0 5.5 9.0 1.0 9.5 3.3 1.0 6.5 12.0 1.0 12.5 5.0 1.0 5.5 9.0 1.0 10.0 3.3 1.0 7.0 11.5 1.0 13.0 5.0 1.0 5.5 9.0 1.0 10.0 Data to output Propagation delay t PHL Data to output Output enable time Output enable time Output disable time Output disable time Note: t ZH t ZL t HZ t LZ 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 3 HD74AC245/HD74ACT245 AC Characteristics: HD74ACT245 Ta = +25°C CL = 50 pF Ta = –40°C to +85°C CL = 50 pF Item Symbol VCC (V)*1 Min Typ Max Min Max Unit Propagation delay Data to output t PLH 5.0 1.0 4.0 7.5 1.0 8.0 ns Propagation delay Data to output t PHL 5.0 1.0 4.0 8.0 1.0 9.0 ns Output enable time t ZH 5.0 1.0 5.0 10.0 1.0 11.0 ns Output enable time t ZL 5.0 1.0 5.5 10.0 1.0 12.0 ns Output disable time t HZ 5.0 1.0 5.5 10.0 1.0 11.0 ns Output disable time t LZ 5.0 1.0 5.0 10.0 1.0 11.0 ns Note: 1. 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 Input/output capacitance CI/O 15.0 pF VCC = 5.5 V Power dissipation capacitance CPD 45.0 pF VCC = 5.0 V 4 HD74AC245/HD74ACT245 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 Hitachi Code JEDEC EIAJ Mass (reference value) FP-20DA — Conforms 0.31 g 5 HD74AC245/HD74ACT245 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 6 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 HD74AC245/HD74ACT245 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. 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