D8254-2

Programmable Timers And Oscillators Overview

The D8254-2 is a high-speed programmable interval timer manufactured by Rochester Electronics, LLC. It serves as a functional equivalent to the Intel 8254 family of devices. The component features three independent 16-bit counters capable of generating precise time delays or frequency division ratios. It supports multiple operating modes including binary and BCD counting, with hardware-triggered strobe capabilities. The device operates at clock frequencies up to 2 MHz in the -2 speed grade, ensuring reliable performance in digital timing applications requiring accurate pulse generation and event counting.

Programmable Timers And Oscillators Feature Summary

• Three independent 16-bit counter channels for versatile timing functions
• Supports six distinct operating modes per channel including square wave generator
• Compatible with standard microprocessor buses (e.g., Intel 8080/8085)
• Single +5V power supply operation with TTL-compatible logic levels

Programmable Timers And Oscillators Applications

• Programmable delay generation in digital systems
• Frequency synthesis and clock signal division
• Real-time event counting and monitoring
• Pulse width modulation control circuits

Programmable Timers And Oscillators Procurement Notes

Verify lot traceability and storage conditions upon receipt. Confirm that the part number suffix matches the required speed grade (-2). Check for lead-free markings if RoHS compliance is mandatory for the assembly process. Ensure static-safe handling procedures are followed during inspection and installation.

Programmable Timers And Oscillators Selection Notes

Select the D8254-2 when a maximum clock frequency of 2 MHz is sufficient for the design requirements. Compare pinout compatibility with existing PCB layouts designed for the original Intel 8254. Consider thermal dissipation needs if operating near maximum voltage limits. Verify address decoding logic aligns with the chip select inputs.

Programmable Timers And Oscillators Part Context

Rochester Electronics specializes in sourcing and distributing obsolete and hard-to-find semiconductor components. The D8254-2 represents a continuation supply for legacy designs originally utilizing Intel's 8254 timer. This product allows manufacturers to maintain production of older equipment without redesigning the core timing circuitry.

Programmable Timers And Oscillators Replacement Considerations

Direct pin-for-pin replacement is possible with other 8254-family timers such as the Intel 8254-2 or National Semiconductor NSC82S201. Verify electrical specifications match the system requirements before substitution. Mechanical footprint compatibility should be confirmed for through-hole mounting.