The TC74HCT245AF is a high-speed CMOS Octal Bus Transceiver manufactured by Toshiba Semiconductor and Storage. This device is designed for asynchronous two-way communication between data buses. It features an output enable (OE) input which, when high, disables the device, and a direction control (DIR) input which determines the direction of data flow.

Applications

• Data bus interface
• Memory interface
• Peripheral interface
• Bidirectional data transfer
• Bus isolation

Features

• High Speed: tpd = 13 ns (typ.) at VCC = 5V.
• Low Power Dissipation: ICC = 4 μA (max) at Ta = 25°C.
• TTL Input Compatibility: VIH = 2.0 V (min), VIL = 0.8 V (max).
• Output Drive Capability: 12 LSTTL Loads.
• Symmetrical Output Impedance: |IOH| = IOL = 6 mA (min).
• Wide Operating Voltage Range: VCC = 4.5 V to 5.5 V.
• Separate Direction Control Input
• High Output Drive

Benefits

• Facilitates bidirectional data transfer between buses, enhancing system flexibility.
• Easy integration with TTL systems due to TTL compatible inputs.
• Reduced power consumption, leading to energy-efficient designs.
• High-speed operation ensures efficient data transfer rates.
• Suitable for high-load applications due to high output drive capability.
• Effective bus isolation by disabling the transceiver.

Additional Details

The TC74HCT245AF operates from a supply voltage of 4.5V to 5.5V. The device is packaged in a small outline package (SOIC), ideal for surface mount technology and compact designs. All inputs are protected against static discharge. The direction control (DIR) input determines whether data flows from A to B or from B to A. The output enable (OE) input controls the output state; when OE is high, the outputs are in a high-impedance state.

The operating temperature range is typically between -40°C and +85°C. The TC74HCT245AF conforms to JEDEC standards for CMOS integrated circuits. The symmetrical output impedance ensures balanced signal propagation and minimal signal distortion. The high output drive capability allows it to drive heavily loaded buses effectively. TTL input compatibility ensures smooth integration with TTL-based components. Applications include microprocessor-based systems, memory interfaces, and peripheral interfaces.