GAL20V8B-10LP

Programmable Logic Device Pld Overview

The GAL20V8B-10LP is a discontinued Generic Array Logic device from Lattice Semiconductor, utilizing high-performance E2CMOS technology. It features 10 dedicated inputs and 8 I/O lines within a 24-pin PLCC package. The component operates at a maximum propagation delay of 10 ns and supports a maximum clock frequency of 58.8 MHz. Electrical specifications include a typical operating supply current of 75 mA for the low-power variant. The architecture includes eight Output Logic Macrocells (OLMCs) with reprogrammable cells, active pull-ups on all pins, and an embedded electronic signature.

Programmable Logic Device Pld Feature Summary

• High Performance E2CMOS Technology: Achieves 5 ns to 10 ns maximum propagation delays depending on speed grade.
• Reprogrammable Architecture: Features Electrically Erasable floating gate technology allowing over 100 erase/write cycles and 20-year data retention.
• Flexible OLMC Configuration: Supports Registered, Complex, and Simple modes to emulate various PAL architectures like 20R8 or 20L8.
• Active Pull-Ups: All pins are equipped with active pull-up resistors to ensure defined logic states.

Programmable Logic Device Pld Applications

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

Programmable Logic Device Pld Procurement Notes

This specific part number has been officially discontinued by Lattice Semiconductor per Product Change Notification PCN#09-10. Verification of availability requires checking secondary market distributors or contacting authorized inventory holders such as Rochester Electronics. Designers must confirm that legacy stock meets original electrical specifications before integration into new hardware.

Programmable Logic Device Pld Selection Notes

Select this component only for legacy system maintenance where pinout and timing compatibility with original designs are critical. The GAL20V8B-10LP provides 10 inputs and 8 I/Os; verify if the GAL20V8C series offers faster 5 ns performance if higher speeds are required. Ensure compiler software settings match the desired OLMC mode (Registered, Complex, or Simple) to utilize the correct fuse map and architectural constraints.

Programmable Logic Device Pld Part Context

The GAL20V8B-10LP belongs to the GAL20V8B product line, which represents the industrial-grade temperature range (-40°C to +85°C) version of the GAL20V8 family. It is distinct from the commercial-grade GAL20V8C devices, which offer faster switching speeds but operate within a narrower temperature range (0°C to +75°C). Both families share the same physical footprint and logical architecture.

Programmable Logic Device Pld Replacement Considerations

Official replacement options listed in the discontinuation notice include the lead-free variants GAL20V8B-10LPN and GAL20V8B-10LPNI. These parts maintain identical electrical and functional characteristics while adhering to updated packaging standards.

Programmable Logic Device Pld FAQ

What is the maximum clock frequency for the GAL20V8B-10LP?

The maximum clock frequency is 58.8 MHz, calculated based on internal feedback constraints (1/(tsu + tcf)).

How many product terms are available per output in Registered mode?

In Registered mode, registered outputs have eight product terms per output, while I/O configurations have seven product terms per output.

Can Pins 1 and 13 be used as dedicated inputs?

No, in Registered mode, Pin 1 and Pin 13 are permanently configured as Clock and Output Enable, respectively. They function as dedicated inputs only in Complex and Simple modes.