HD74ACT245 Datasheet | Hitachi Semiconductor

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 m A 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 m A HD74ACT245 has TTL-patible 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 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 µA µA m A Condition VIN = VCC or ground, VCC = 5.5 V, Ta = Worst case VIN = VCC or ground, VCC = 5.5 V, Ta = 25°C VIN = VCC - 2.1 V, VCC = 5.5 V, Ta = Worst case AC Characteristics: HD74AC245 Ta = +25°C CL = 50 p F 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...