GAL20V8B-25QPNI

Programmable Logic Device Pld Overview

The GAL20V8B-25QPNI is a discontinued high-performance Electrically Erasable Programmable Logic Device (PLD) manufactured by Lattice Semiconductor. It utilizes E2CMOS technology and features an industrial temperature range of -40°C to +85°C with a supply voltage of 4.50V to 5.50V. The device provides 10 dedicated inputs, 8 I/O lines, and 8 Output Logic Macrocells within a 28-pin PLCC package. Key electrical parameters include a maximum propagation delay of 25 ns, a typical operating current of 65 mA for the quarter-power variant, and a maximum clock frequency of 37 MHz with external feedback.

Programmable Logic Device Pld Feature Summary

• E2CMOS Technology: Features reprogrammable cells with 100% tested yields, high-speed electrical erasure under 100ms, and over 20 years data retention.
• Flexible Architecture: Supports Registered, Complex, and Simple OLMC modes, allowing emulation of various PAL architectures like 20R8 and 20L8.
• Active Pull-ups: Includes active pull-up resistors on all pins to ensure defined logic states.
• Electronic Signature: Contains 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
• Standard Logic Speed Upgrade

Programmable Logic Device Pld Procurement Notes

This component has been officially discontinued by Lattice Semiconductor per Product Change Notification PCN#13-10. No new units are available from the manufacturer. Verification of authenticity and functional integrity is critical when sourcing from secondary markets, as availability is limited to existing inventory.

Programmable Logic Device Pld Selection Notes

Designers requiring this specific logic density should note that the GAL20V8B-25QPNI is obsolete. Selection of replacement components must account for the transition from legacy GAL architecture to modern CPLDs or FPGAs, ensuring pin compatibility and logic function equivalence if a direct drop-in replacement is required.

Programmable Logic Device Pld Part Context

The GAL20V8 series represents a classic generation of Generic Array Logic devices designed to replace fixed-function PALs. The 'B' suffix denotes the specific product line iteration, while 'Q' indicates Quarter Power consumption and 'I' specifies the Industrial temperature grade. This part was widely used in systems requiring reconfigurable logic before the dominance of dense FPGAs.

Programmable Logic Device Pld Replacement Considerations

Public confirmed substitute part numbers are not provided in the source material due to the discontinuation status. Designers should consult Lattice's current SPLD or CPLD portfolios for functional equivalents.

Programmable Logic Device Pld FAQ

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

The maximum clock frequency is 37 MHz when using external feedback, calculated based on the setup time and clock-to-output delay specifications.

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.

What is the typical operating current for this device?

For the Quarter Power (Q) variant at 15MHz toggle frequency, the typical operating current is 45 mA, with a maximum of 65 mA.