ATF16V8BQL-15SI

Overview

The ATF16V8BQL-15SI 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 -15 speed grade provides a maximum pin-to-pin delay of 15 ns with a setup time of 12 ns. Designed for industrial applications, it operates within a temperature range of -40°C to +85°C at 5V ± 10%. The device offers low standby current (typical 5 mA), 2000V ESD protection, and 200mA latchup immunity.

Feature Summary

• Industrial temperature range (-40°C to +85°C) with 15 ns max propagation delay
• Low-power L variant with 5 mA typical standby current
• Reprogrammable Flash architecture supporting 100 erase/write cycles
• Emulates 20-pin PALs including 16R8, 16L8, and 16H8 families

Applications

• Direct replacement for obsolete 20-pin PAL devices in industrial control systems
• State machine implementation requiring power-up reset initialization
• Complex logic functions in voltage-limited embedded environments

Procurement Notes

Verify the ordering suffix 'SI' corresponds to the SOIC package and Industrial temperature rating as defined in the official Microchip/Atmel ordering guide. Confirm RoHS compliance status, as historical data indicates mixed leaded and lead-free variants within this family. Ensure programming hardware supports the specific Flash architecture and security fuse options.

Selection Notes

Select the ATF16V8BQL variant over standard B or BQ versions when system power consumption is critical, due to its significantly lower standby current. The -15 speed grade is suitable for designs requiring up to 15 ns delays; faster 7.5 ns or 10 ns grades are available if timing constraints demand higher performance. Ensure the design utilizes the appropriate compiler mode (Registered, Complex, or Simple) to match the required I/O configuration.

Part Context

This component belongs to the ATF16V8B series, which includes standard (B), low-power (BQ), and ultra-low-power (BQL) variants. The 'S' suffix denotes the 20-lead Plastic Gull-Wing Small Outline (SOIC) package, while 'I' specifies the Industrial temperature operating range. This series serves as a drop-in replacement for legacy GAL and PAL logic devices.

Replacement Considerations

The ATF16V8BQL-15SI can directly replace devices such as the ATF16V8B-15SI, ATF16V8BQ-15SI, and various 20-pin PALs like the GAL16V8 or Lattice P16V8 when configured via software compilers. Verify that the target application does not exceed the 15 ns timing specifications of this specific speed grade.

FAQ

What are the three operational modes of the ATF16V8BQL?

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

How does the power-up reset feature function?

Registers reset to the low state during power-up when VCC crosses the reset voltage threshold (3.8V to 4.5V). This ensures registered outputs start in a known high state, facilitating reliable state machine initialization.

What is the significance of the internal pull-up resistors?

All inputs and I/Os have internal weak pull-up resistors that float undriven pins to VCC, ensuring known logic states. These can be easily overridden by external TTL-compatible drivers.