GAL18V10B-20LJ

Programmable Logic Device Pld Overview

The GAL18V10B-20LJ is a discontinued high-performance E2CMOS Programmable Logic Device (PLD) manufactured by Lattice Semiconductor. It features a 20-pin PLCC package and operates at a maximum propagation delay of 20 ns. The device utilizes Electrically Erasable floating gate technology, allowing for rapid reprogramming with erase times under 100 ms and data retention exceeding 20 years. It includes ten Output Logic Macrocells (OLMCs) compatible with the standard 22V10 architecture, supporting both registered and combinatorial I/O modes. Key electrical specifications include a typical supply current of 75 mA and TTL-compatible 16 mA outputs.

Programmable Logic Device Pld Feature Summary

• E2CMOS Technology: Features electrically erasable cells with high-speed erase (<100ms), 100 erase/write cycles, and >20-year data retention.
• Flexible OLMC Architecture: Ten macrocells based on the 22V10 standard, configurable for registered or combinatorial operation with individual polarity control.
• Reset and Preset Control: Includes dedicated product terms for Asynchronous Reset (AR) and Synchronous Preset (SP) to force registers into known states.
• Active Pull-ups: All pins feature active pull-up circuits to prevent floating inputs, improving noise immunity.

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 GAL18V10 series have been officially discontinued per Product Change Notifications PCN#06-07 through PCN#13-10. Original inventory may be available through authorized distributors such as Rochester Electronics. Verification of part authenticity and condition is required when sourcing from secondary markets due to the end-of-life status.

Programmable Logic Device Pld Selection Notes

Designers should evaluate advanced replacement families recommended by Lattice Semiconductor for new designs, as this component is classified as a mature/discontinued device. When replacing, ensure compatibility with the 22V10 macrocell architecture and verify that the target device supports the required 20 ns timing and 5V operating voltage. Check for equivalent pinouts if maintaining the same physical footprint is necessary.

Programmable Logic Device Pld Part Context

The GAL18V10 belongs to the Generic Array Logic (GAL) family, which bridges the gap between simple PALs and complex FPGAs. It was designed to offer reprogrammability similar to EPROM-based PALs but with the convenience of electrical erasure. The 'B' suffix indicates commercial grade, and '20' denotes the 20 ns speed grade. The 'LJ' suffix specifies the Plastic Leadless Chip Carrier (PLCC) package type.

Programmable Logic Device Pld Replacement Considerations

Public confirmed substitute part numbers are not provided in the source material. Lattice recommends evaluating newer FPGA families for new designs. Contact Rochester Electronics or Arrow Electronics for information regarding existing stock of this discontinued product line.

Programmable Logic Device Pld FAQ

How does the GAL18V10 handle power-up states?

The device includes internal circuitry that resets all registers to logic zero during power-up (within 1μs max). Registered output pins will assume a high or low state depending on their programmed polarity, providing a known initial state for state machines.

What is the function of the Electronic Signature?

The GAL18V10 contains a 64-bit reprogrammable memory area for an electronic signature. This allows users to store user-defined data such as ID codes, revision numbers, or inventory control information. This signature remains accessible even if the security cell is programmed.

Can unused inputs be left floating?

While built-in active pull-ups cause floating inputs to float to a TTL high (logic 1), Lattice Semiconductor recommends connecting all unused inputs and tri-stated I/O pins to an adjacent active input, Vcc, or ground to improve noise immunity and reduce supply current.