The UPD74HCT245C is an octal bus transceiver with 3-state outputs manufactured by NEC. This device is commonly used for bidirectional data transfer between two buses or systems. It features a direction control input that determines the direction of data flow, and an output enable input that controls whether the outputs are active or in a high-impedance state. The 'HCT' designation indicates that the device is designed to interface with TTL logic levels while maintaining the high-speed performance of CMOS technology.

Applications

• Bus Interfacing: Connecting two buses with different voltage levels or impedance characteristics.
• Microprocessor Systems: Enabling bidirectional data transfer between a microprocessor and peripherals.
• Memory Interfacing: Connecting memory devices to a system bus.
• Data Communication Systems: Facilitating bidirectional communication between two devices.
• I/O Port Expansion: Expanding the number of available I/O ports in a system.
• Isolating Bus Segments: Isolating sections of a bus for testing or maintenance.

Features

• Octal Transceiver: Provides eight channels for bidirectional data transfer.
• 3-State Outputs: Outputs can be in a high, low, or high-impedance state.
• Direction Control Input: Determines the direction of data flow (A to B or B to A).
• Output Enable Input: Enables or disables the outputs.
• TTL-Compatible Inputs: Compatible with TTL logic levels.
• High-Speed Operation: Fast propagation delay times.
• Low Power Consumption: CMOS technology ensures low power dissipation.

Benefits

• Bidirectional Data Transfer: Allows data to flow in both directions between two buses.
• Bus Isolation: Provides isolation between bus segments when outputs are disabled.
• TTL Compatibility: Interfaces directly with TTL logic circuits.
• High-Speed Performance: Enables fast data transfer rates.
• Low Power Consumption: Minimizes power dissipation, making it suitable for battery-powered applications.
• Simplified System Design: Reduces the need for external components, simplifying circuit design.
• Versatile Applications: Suitable for a wide range of bus interfacing and data transfer applications.

Technical Specifications

• Operating Voltage Range: 4.5V to 5.5V.
• Operating Temperature Range: -40°C to +85°C.
• Input Voltage (Low): 0V to 0.8V.
• Input Voltage (High): 2V to VCC.
• Output Voltage (Low): 0V to 0.4V.
• Output Voltage (High): VCC - 0.4V to VCC.
• Propagation Delay Time: Typically 10ns to 20ns, depending on the load capacitance.
• Quiescent Current: Typically less than 8µA.
• Package Type: DIP-20 or SOIC-20.

The UPD74HCT245C is a reliable and versatile octal bus transceiver suitable for a wide range of bus interfacing and data transfer applications. Its bidirectional capability, TTL compatibility, and high-speed performance make it a valuable component in digital system design.