The HD74ACT245TELL is an octal bus transceiver with three-state outputs manufactured by Hitachi. This device belongs to the Advanced CMOS Technology (ACT) logic family, offering improved speed and performance compared to standard CMOS logic. It is designed for bidirectional asynchronous communication between data buses.

Applications

• Bidirectional Data Transfer: Used for transmitting data in both directions between two buses.
• Memory Interfacing: Employed as a buffer between memory and the system bus, allowing for read and write operations.
• Peripheral Interfacing: Utilized for interfacing peripherals with the system bus.
• Asynchronous Communication: Designed for asynchronous data transfer between different parts of a system.

Features

• Octal Bus Transceiver: Contains eight independent transceivers in a single package.
• Three-State Outputs: Offers three output states: HIGH, LOW, and HIGH-impedance (disabled).
• High Output Drive Capability: Provides sufficient output current to drive heavily loaded buses.
• Direction Control: Features a direction control input that determines the direction of data flow.
• Fast Propagation Delay: Offers fast propagation delay times for high-speed data transfer.

Benefits

• Bidirectional Communication: Enables data transfer in both directions between two buses.
• Increased Bus Drive: Enhances the drive capability of buses, allowing them to support more devices.
• Improved Signal Integrity: Minimizes signal degradation and noise on buses.
• Flexible Bus Management: Three-state outputs allow for selective enabling and disabling of bus devices.
• High-Speed Data Transfer: Fast propagation delay enables high-speed data transfer on buses.

Additional Details

The HD74ACT245TELL is typically available in a surface-mount package (SOIC - Small Outline Integrated Circuit). Key specifications include a propagation delay of approximately 5-10 ns, an output drive current of around 24 mA, and an operating temperature range of -40°C to +85°C. The direction of data flow is controlled by a DIR (direction) input. The output enable (OE) input controls whether the outputs are enabled or in a high-impedance state. The TELL likely denotes a specific packaging characteristic or environmental compliance attribute.