ATF2500C-20PC

Complex Programmable Logic Devices Overview

The ATF2500C-20PC is a high-density, electrically-erasable programmable logic device (PLD) manufactured by Microchip Technology. It features a fully connected logic array with 416 product terms and 24 flexible output macrocells. The component supports up to 48 flip-flops per macrocell and offers a maximum pin-to-pin delay of 20 ns for 5V operation. It operates within a commercial temperature range of 0°C to 70°C and utilizes a 40-pin plastic dual inline package (PDIP).

Complex Programmable Logic Devices Feature Summary

• High-performance CPLD with 416 product terms and 24 macrocells.
• Flexible macrocell structure supporting D-type or T-type flip-flops.
• Fully connected logic array ensuring all pins and feedback terms are available to every macrocell.
• Includes programmable Pin-keeper circuits and a security fuse feature.

Complex Programmable Logic Devices Applications

• Complex digital logic replacement in industrial control systems.
• State machine implementation requiring multiple independent clock domains.
• Bus interfacing applications utilizing the internal Pin-keeper functionality.

Complex Programmable Logic Devices Procurement Notes

Verify that the specific ordering suffix PC corresponds to the 40-pin PDIP package and commercial temperature grade (0°C to 70°C). Confirm RoHS compliance status as standard packages may differ from Green options. Ensure programming equipment supports the V2500 JEDEC file format for cross-programming compatibility.

Complex Programmable Logic Devices Selection Notes

Select this model when a 40-pin through-hole DIP footprint is required for the ATF2500C architecture. The -20 speed grade provides a 20 ns maximum propagation delay suitable for moderate-speed designs. Compare against the -15JC variant if higher performance (15 ns delay) or surface mount packaging is acceptable for the application constraints.

Complex Programmable Logic Devices Part Context

The ATF2500C series represents Atmel's highest-density PLD offering in a 44-pin surface mount or 40-pin DIP package. It serves as a backward-compatible upgrade for the ATV2500B/BQ and ATV2500H families, allowing direct software migration using WinCUPL while providing enhanced flexibility through buried flip-flops and combinable sum terms.

Complex Programmable Logic Devices Replacement Considerations

Functionally equivalent to the ATV2500B, ATV2500BQ, and ATV2500H devices. The ATF2500C-20PC can replace these legacy parts in designs requiring a 40-pin DIP package, provided the system accommodates the specific power-up reset timing requirements defined in the datasheet.

Complex Programmable Logic Devices FAQ

What is the maximum operating frequency for external feedback?

For the -20 speed grade, the maximum operating frequency with external feedback is 40 MHz.

How does the ATF2500C handle unused inputs?

The device includes programmable Pin-keeper circuits that maintain floating inputs at their last driven state. If disabled, standard termination procedures for unused inputs must be followed.

Can the registers be preloaded during testing?

Yes, the registers support asynchronous preload via the SMP lead (pin 42) and I/O pins, allowing any state to be forced into the registers to simplify test sequencing.