The UM8253-5 is a programmable interval timer chip manufactured by UMC Corporation. It is a versatile component designed to generate accurate timing signals and interrupt requests in a variety of applications. The UM8253-5 is functionally equivalent to the Intel 8253 and 8254 programmable interval timers.

Applications

• Real-time clocks: Used to maintain accurate timekeeping in computer systems and embedded devices.
• Frequency generation: Generates precise frequencies for various applications, such as communication systems and test equipment.
• Event counting: Counts events and triggers interrupts or other actions based on the count.
• Waveform generation: Creates custom waveforms for audio synthesis, motor control, and other applications.
• Industrial control: Controls timing sequences in industrial automation equipment.

Features

• Three Independent 16-bit Counters: Each counter can be programmed to operate in different modes.
• Six Programmable Operating Modes: Includes modes for generating square waves, one-shot pulses, rate generators, and software-triggered strobes.
• Binary or BCD Counting: Counters can be programmed to count in binary or BCD format.
• Read-Back Command: Allows the current count and status of each counter to be read.
• Single 5V Power Supply: Operates from a single 5V power supply.
• TTL Compatible: Compatible with standard TTL logic levels.

Benefits

• Versatile Timing Solution: Provides a flexible and configurable timing solution for a wide range of applications.
• Accurate Timing: Generates precise timing signals with minimal drift.
• Easy to Interface: Simple interface to microprocessors and other digital systems.
• Reliable Operation: Robust design ensures reliable operation in harsh environments.
• Cost-Effective: Provides a cost-effective timing solution for embedded systems.

Additional Details

The UM8253-5 is typically packaged in a 24-pin DIP (Dual In-line Package). It is controlled by writing to specific control and data ports. The control word determines the operating mode, counting format, and other parameters of each counter. The data ports are used to load initial counts into the counters. The chip offers a variety of interrupt outputs that can be used to signal the completion of a timing interval or the occurrence of a specific event. Detailed specifications, including timing diagrams, control word formats, and electrical characteristics, are available in the device datasheet. Its compatibility with the Intel 8253 simplifies integration into existing designs.