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HD74AC245

Hitachi Semiconductor
Part Number HD74AC245
Manufacturer Hitachi Semiconductor
Description Octal Bidirectional Transceiver with 3-State Input/Output
Published Mar 23, 2005
Detailed Description HD74AC245/HD74ACT245 Octal Bidirectional Transceiver with 3-State Input/Output Description The HD74AC245/HD74ACT245 con...
Datasheet PDF File HD74AC245 PDF File

HD74AC245
HD74AC245

Overview
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 µA µA mA 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 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...


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