The TC74LCX245FK is an octal bus transceiver from Toshiba's LCX family of high-performance CMOS logic devices. This device is designed for bidirectional asynchronous communication between data buses. It features low-voltage operation, making it suitable for use in mixed-voltage systems.

Applications

• Data bus interfacing in computer systems
• Memory interfacing
• Networking equipment
• Level translation between different voltage domains
• Telecommunications equipment

Features

• Low-voltage operation: VCC = 2.0 to 3.6 V
• High-speed operation: tpd = 4.2 ns (max) at VCC = 3.3 V
• Output drive capability: ±24 mA at VCC = 3.3 V
• TTL-compatible input thresholds
• Power-down protection on inputs and outputs
• Available in a space-saving SSOP20 package

Benefits

• Improved system performance due to high-speed operation
• Reduced power consumption due to low-voltage operation
• Direct interface with TTL devices
• Protection against back-drive current during power-down
• Space-saving design for compact applications

Additional Details

The TC74LCX245FK features eight independent transceiver channels, each with a dedicated direction control (DIR) input. A high level on the DIR input enables data transmission from A to B, while a low level enables data transmission from B to A. The output enable (OE) input controls the output buffers. When OE is low, the outputs are enabled; when OE is high, the outputs are in a high-impedance state.

The device is fabricated using Toshiba's advanced CMOS process, which ensures low power consumption and high noise immunity. The power-down protection feature prevents back-drive current from flowing through the device when VCC is turned off, protecting other components in the system. The TTL-compatible input thresholds allow direct interfacing with TTL devices without the need for external level translation circuits.