The TMP8155P, manufactured by Toshiba Semiconductor and Storage, is a peripheral interface device designed for use with Intel 8085 and similar microprocessor systems. It serves as a combination of RAM, I/O ports, and a timer, offering a convenient way to expand the capabilities of a microprocessor system. This integrated solution simplifies system design and reduces the number of components required for interfacing with external devices.

Applications

• Memory and I/O Expansion: Provides additional RAM and I/O ports for microprocessor systems.
• Peripheral Control: Interfaces microprocessors with various peripherals, such as printers, displays, and keyboards.
• Timer Applications: Generates timing signals for controlling external devices and processes.
• Industrial Control Systems: Used in older industrial control systems where 8085 or similar processors are employed.
• Data Acquisition Systems: Facilitates the acquisition of data from sensors and other input devices.

Features

• 256 Bytes of Static RAM: Provides on-chip memory for data storage and buffering.
• Three Programmable I/O Ports: Offers flexible I/O capabilities for interfacing with a variety of external devices.
• 14-bit Programmable Timer/Counter: Allows for precise timing and counting operations.
• Multiplexed Address/Data Bus: Compatible with the multiplexed address/data bus architecture of the Intel 8085 microprocessor.
• Chip Select Input: Simplifies memory and I/O address decoding.
• Single +5V Power Supply: Operates from a single +5V power supply, simplifying system power requirements.

Benefits

• Integration: Combines RAM, I/O ports, and a timer into a single chip, reducing component count and board space.
• Simplified Interface: Designed for easy interfacing with Intel 8085 and similar microprocessor systems.
• Flexible I/O: Programmable I/O ports allow for adaptation to a wide range of peripheral devices.
• Precise Timing: 14-bit timer/counter enables accurate timing control.
• Cost-Effective: Provides a cost-effective solution for expanding the capabilities of microprocessor systems.

Additional Details

The TMP8155P communicates with the microprocessor using a multiplexed address/data bus, requiring external demultiplexing logic to separate the address and data signals. The I/O ports can be individually configured as inputs or outputs, providing flexibility in interfacing with different peripherals. The 14-bit timer/counter can be programmed to generate interrupts, allowing for real-time control of external devices. Proper address decoding is essential for ensuring that the TMP8155P is accessed correctly by the microprocessor. Datasheets provide detailed information on pin assignments, timing characteristics, and programming considerations. The package is typically a 40-pin DIP (Dual In-Line Package).