GAL22V10D-20LJI

Programmable Logic Device Pld Overview

The GAL22V10D-20LJI is a discontinued Electrically Erasable CMOS Programmable Logic Device (PLD) from Lattice Semiconductor. It features a 44-input, 22-output architecture with ten Output Logic Macrocells (OLMCs). The device supports registered and combinatorial I/O modes with variable product term distribution per macrocell. Key electrical specifications include a maximum propagation delay of 20 ns, a typical supply current of 75 mA at 5V, and operation within a commercial temperature range of 0°C to +75°C. It utilizes E2CMOS technology for high-speed erasure and reprogramming.

Programmable Logic Device Pld Feature Summary

• E2CMOS Technology: Supports over 100 erase/write cycles with data retention exceeding 20 years.
• Flexible OLMCs: Ten macrocells with configurable registered or combinatorial modes and individual polarity control.
• Active Pull-ups: Built-in active pull-up circuits on all pins to manage floating inputs.
• Electronic Signature: Includes 64 bits of user-reprogrammable memory for identification or revision tracking.

Programmable Logic Device Pld Applications

• DMA Control
• State Machine Control
• High Speed Graphics Processing

Programmable Logic Device Pld Procurement Notes

All devices in the GAL22V10 family are officially discontinued per Product Change Notifications PCN#09-10 and PCN#13-10. Verification of availability requires checking secondary market distributors or Rochester Electronics inventory lists. No new production is guaranteed by Lattice Semiconductor.

Programmable Logic Device Pld Selection Notes

Select this component only if legacy compatibility with standard 22V10 fuse maps is required. The -20 speed grade offers a 20 ns max propagation delay. Ensure design tools support the specific electronic signature extension if utilizing the extra 64 fuses beyond the standard JEDEC map.

Programmable Logic Device Pld Part Context

This part belongs to the GAL22V10D series, which provides function and parametric compatibility with bipolar and UVCMOS 22V10 devices. The 'L' suffix indicates Low Power consumption variants, while 'J' denotes PLCC packaging and 'I' specifies Industrial temperature grading, though this specific ordering code references Commercial grade specs in the provided table context.

Programmable Logic Device Pld Replacement Considerations

No direct functional replacements are listed in the datasheet. Discontinued parts may be substituted with modern CPLDs or FPGAs, requiring logic migration and pinout adaptation. Contact Rochester Electronics for potential surplus stock verification.

Programmable Logic Device Pld FAQ

What is the difference between registered and combinatorial mode in the OLMC?

In registered mode, the output is driven by the D-type flip-flop Q output, providing synchronous timing. In combinatorial mode, the output is driven directly by the sum term gate, allowing dynamic I/O functionality where feedback comes from the pin side.

How does the power-on reset feature work?

Internal circuitry resets all registers to logic zero upon power-up. This ensures a known state for registered outputs, simplifying state machine initialization, provided the Vcc rise is monotonic and the clock is static during power-up.

What is the purpose of the Electronic Signature?

The Electronic Signature consists of 64 bits of reprogrammable memory available regardless of the security cell state. It allows users to store user ID codes, revision numbers, or inventory control data.