ATF16V8B-15PC

Overview

The ATF16V8B-15PC is a high-performance CMOS electrically erasable programmable logic device (PLD) utilizing Atmel's Flash memory technology. It features eight macrocells and supports three operational modes: registered, complex, and simple. The device provides a maximum pin-to-pin propagation delay of 15 ns and operates on a 5V supply with ±5% tolerance for commercial applications (0°C to 70°C). It includes internal pull-up resistors, 2000V ESD protection, and 200mA latchup immunity. Packaged in a 20-lead Plastic Dual Inline Package (PDIP), it allows reprogramming up to 100 times with 20-year data retention.

Feature Summary

• Emulates industry-standard 20-pin PAL devices via configurable Registered, Complex, and Simple modes.
• Utilizes advanced Flash technology allowing 100 erase/write cycles and 20-year data retention.
• CMOS and TTL compatible inputs/outputs with integrated internal pull-up resistors.
• High reliability specifications including 2000V ESD protection and 200mA latchup immunity.

Applications

• Direct replacement for 16R8 family and other 20-pin combinatorial PLDs.
• Industrial control systems requiring reprogrammable logic.
• Complex digital logic implementation in embedded designs.

Procurement Notes

Verify the component status as Obsolete before procurement planning. Confirm that the specific ordering suffix 'PC' corresponds to the 20-lead PDIP package and Commercial temperature range (0°C to 70°C). Ensure compatibility with standard PLD programmers for Flash-based programming and erasing operations.

Selection Notes

Select this part when a direct architectural substitute for legacy 20-pin PALs is required. The -15 speed grade offers a 15 ns maximum delay suitable for moderate-speed applications. Consider the BQ or BQL variants if lower standby current consumption is necessary for power-limited designs.

Part Context

This component belongs to the ATF16V8B series, which also includes low-power variants ATF16V8BQ and ATF16V8BQL. The series is designed to provide a superset of generic architectures found in older PAL devices, ensuring backward compatibility while offering modern Flash-based reprogrammability.

Replacement Considerations

Public confirmed substitutes include ATF16V8B-15PI (Industrial temperature range) and ATF16V8B-15SC (SOIC package). Verify package dimensions and thermal requirements when substituting between DIP, SOIC, or PLCC formats.

FAQ

What are the three operational modes of the ATF16V8B?

The device supports Registered mode (for state machines with clocked outputs), Complex mode (combinatorial outputs with output enable control), and Simple mode (dedicated combinatorial outputs without OE control).

How does the ATF16V8B handle unused inputs?

All inputs and I/O pins feature internal pull-up resistors. If not driven externally, these pins float to VCC, ensuring known logic states and reducing external component count.

What is the security fuse function?

A single security fuse prevents unauthorized copying of the device's fuse patterns. Once programmed, it inhibits fuse verify and preload functions, though the 64-bit User Signature remains accessible.