GAL20V8B-25QP

Programmable Logic Device Pld Overview

The GAL20V8B-25QP is a discontinued Electrically Erasable Programmable Logic Device (EPLD) manufactured by Lattice Semiconductor. It utilizes high-performance E2CMOS technology and features a Generic Array Logic architecture with eight Output Logic Macrocells (OLMCs). The device provides 10 dedicated inputs, 8 I/O lines, and operates within a -40°C to +85°C industrial temperature range. Key electrical specifications include a maximum propagation delay of 25 ns, a typical operating supply current of 65 mA at 5V, and an absolute maximum supply voltage of 7V.

Programmable Logic Device Pld Feature Summary

• High Performance E2CMOS Technology: Supports up to 166 MHz operation with active pull-ups on all pins.
• Reprogrammable Architecture: Features 100% tested/100% yields, 100 erase/write cycles, and over 20-year data retention.
• Flexible OLMC Configuration: Supports Registered, Complex, and Simple modes to emulate various PAL architectures.
• Electronic Signature: Includes 64 bits of reprogrammable memory for user-defined identification data.

Programmable Logic Device Pld Applications

• DMA Control
• State Machine Control
• High Speed Graphics Processing
• Standard Logic Speed Upgrade

Programmable Logic Device Pld Procurement Notes

All devices in the GAL20V8 family have been officially discontinued per Product Change Notifications (PCNs), including PCN#09-10 and PCN#13-10. Verification of availability requires contacting authorized distributors or secondary market suppliers such as Rochester Electronics. No new production units are available from Lattice Semiconductor.

Programmable Logic Device Pld Selection Notes

Select this component only if legacy compatibility with specific PAL fuse maps or parametric characteristics is required. The GAL20V8B-25QP offers a 25 ns speed grade with Quarter Power consumption (65 mA typical). Designers should verify that the 28-pin PLCC package fits the target footprint and that the 5V logic levels match the system requirements.

Programmable Logic Device Pld Part Context

The GAL20V8 series represents Lattice's early generation of electrically erasable programmable logic devices. The 'B' suffix denotes the Industrial Grade variant, while 'Q' indicates Quarter Power consumption options. This part number belongs to the broader GAL20V8 product line which was designed to replace standard bipolar PALs with CMOS-based reconfigurable alternatives.

Programmable Logic Device Pld Replacement Considerations

Lattice Semiconductor has discontinued the GAL20V8B-25QP. Potential replacement strategies involve consulting third-party inventory holders like Rochester Electronics for existing stock or evaluating modern CPLD/FPGA equivalents from Lattice or other vendors that offer similar pin counts and logic density.

Programmable Logic Device Pld FAQ

What is the maximum clock frequency for the GAL20V8B-25QP?

The maximum clock frequency (fmax) with no feedback is 41.7 MHz. With internal feedback, it is 40 MHz, and with external feedback, it is 37 MHz.

How many erase/write cycles does the GAL20V8B support?

The device supports 100 erase/write cycles with a specified data retention of over 20 years.

Can the GAL20V8B-25QP emulate standard PAL devices?

Yes, the GAL20V8 can emulate various 24-pin PAL architectures (such as 20R8, 20L8, and 14L8) with full function, fuse map, and parametric compatibility through its configurable Output Logic Macrocells.