GAL20V8B-25QJNI

Programmable Logic Device Pld Overview

The GAL20V8B-25QJNI is a discontinued Electrically Erasable Programmable Logic Device (EE PLD) manufactured by Lattice Semiconductor. It features eight Output Logic Macrocells (OLMCs), 10 dedicated inputs, and 8 I/O lines within a 28-pin Plastic Leaded Chip Carrier (PLCC) package. The device utilizes E2CMOS technology with a maximum propagation delay of 25 ns and a typical operating supply current of 65 mA for the quarter-power variant. Product Change Notification PCN#13-10 confirms its discontinuation.

Programmable Logic Device Pld Feature Summary

• Eight reprogrammable Output Logic Macrocells (OLMCs) supporting simple, complex, and registered modes
• E2CMOS technology enabling high-speed electrical erasure in under 100ms
• Active pull-ups on all pins to reduce external component requirements
• Emulates standard PAL architectures including 20R8, 20L8, and 14L8

Programmable Logic Device Pld Applications

• DMA Control logic implementation
• State Machine control circuits
• High Speed Graphics Processing
• Standard Logic Speed Upgrade replacements

Programmable Logic Device Pld Procurement Notes

This part number is officially discontinued per Product Change Notification PCN#13-10 issued by Lattice Semiconductor. Availability is restricted to existing inventory or third-party surplus markets. Verification of authenticity and physical condition is required when sourcing from non-original distributors due to the end-of-life status.

Programmable Logic Device Pld Selection Notes

Select this component only for legacy system maintenance where specific pinouts and fuse maps are mandatory. The GAL20V8C series offers faster performance at 5ns but lacks the industrial temperature range (-40°C to 85°C) specified for the GAL20V8B. Ensure design software supports the GAL20V8 device type for proper macrocell configuration.

Programmable Logic Device Pld Part Context

The GAL20V8B belongs to the Generic Array Logic (GAL) family, designed to replace bipolar PAL devices with CMOS flexibility. The 'B' suffix denotes the Industrial Grade version, while 'Q' indicates Quarter Power consumption characteristics. The 'JN' suffix specifies the lead-free PLCC-28 package.

Programmable Logic Device Pld Replacement Considerations

No direct functional equivalents are listed in the provided documentation. Legacy designs may require retargeting to modern CPLDs such as the Lattice MACH or ispMACH families, though pin compatibility will not be maintained.

Programmable Logic Device Pld FAQ

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

The maximum clock frequency with no feedback is 41.7 MHz. With internal feedback, it is 50 MHz, and with external feedback, it is 45.4 MHz.

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, and cannot be used as dedicated inputs.