GAL20V8B-25LJN

Programmable Logic Device Pld Overview

The GAL20V8B-25LJN is a discontinued Generic Array Logic (GAL) device manufactured by Lattice Semiconductor. It utilizes high-performance E2CMOS technology, featuring Electrically Erasable floating gate cells for reprogrammability. The component provides eight Output Logic Macrocells (OLMCs) and supports registered, complex, or simple logic configurations. Key electrical specifications include a maximum propagation delay of 25 ns, a maximum operating frequency of 41.6 MHz with external feedback, and an industrial temperature range of -40°C to +85°C. It operates on a single +4.50V to +5.50V supply voltage.

Programmable Logic Device Pld Feature Summary

• High Performance E2CMOS Technology: Features 50% to 75% power reduction compared to bipolar devices, with typical supply current of 130 mA at 15 MHz toggle rate.
• Reprogrammable Architecture: Supports up to 100 erase/write cycles with over 20 years data retention using fast electrical erasure (<100ms).
• Flexible OLMC Configuration: Eight macrocells configurable as Registered, Complex, or Simple modes, emulating standard PAL architectures like 20R8, 20L8, and 20P8.
• Active Pull-ups: All pins feature active pull-up resistors to prevent floating states.

Programmable Logic Device Pld Applications

• DMA Control systems
• State Machine Control logic
• High Speed Graphics Processing interfaces
• Standard Logic Speed Upgrade replacements

Programmable Logic Device Pld Procurement Notes

This specific part number has been officially discontinued by Lattice Semiconductor per Product Change Notification (PCN) #13-10. No new units are manufactured. Verification of availability requires checking secondary market distributors or authorized liquidation partners for existing inventory. Designers must confirm the authenticity of any sourced components due to the discontinuation status.

Programmable Logic Device Pld Selection Notes

Select this device only if legacy compatibility with GAL20V8 pinouts and fuse maps is required. The '25' suffix indicates a 25 ns speed grade, suitable for lower-frequency applications compared to the -5 or -7 variants. The 'LJN' suffix denotes a Lead-Free PLCC package in Industrial temperature grade (-40°C to +85°C). Ensure the design does not require higher speeds than 41.6 MHz fmax.

Programmable Logic Device Pld Part Context

The GAL20V8 series represents Lattice's entry into electrically erasable programmable logic devices, bridging the gap between mask-programmed PALs and later FPGA technologies. The GAL20V8B variant specifically targets industrial environments with extended temperature ranges. This family was foundational for Lattice's CPLD development before the introduction of Mach and ispMACH families.

Programmable Logic Device Pld Replacement Considerations

Direct functional substitutes include other GAL20V8 variants such as GAL20V8B-25LJI or GAL20V8C-25LJN, though package lead-free status may differ. For modern equivalents, consider Lattice's MachXO2 or CrossLink-NX families, which offer similar I/O counts but require architectural redesign.

Programmable Logic Device Pld FAQ

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

The maximum clock frequency (fmax) with external feedback is 41.6 MHz. With internal feedback, it is 50 MHz, and with no feedback, it is 62.5 MHz.

How many erase/write cycles are supported?

The device supports up to 100 electrical erase/write cycles, with a specified data retention period exceeding 20 years.

Can the GAL20V8B-25LJN emulate standard PAL devices?

Yes, it can emulate various 24-pin PAL architectures including 20R8, 20L8, 20P8, 14L8, and 16P8 through its configurable Output Logic Macrocells (OLMCs).