ATF1508AS-15QI160

Complex Programmable Logic Devices Overview

The ATF1508AS-15QI160 is a high-performance, electrically-erasable complex programmable logic device (CPLD) from the ATF1508AS family. It features 128 macrocells with up to 40 product terms per macrocell via cascade expansion. The device supports In-System Programmability (ISP) via JTAG and offers flexible I/O configurations with 3.3V or 5.0V operation. Key electrical parameters include a maximum pin-to-pin delay of 15 ns, registered operation up to 125 MHz, and VCCINT/VCCIO supply voltages of 5.0V ±5% (commercial) or ±10% (industrial). It operates within temperature ranges of 0°C to +70°C (commercial) or -40°C to +85°C (industrial).

Complex Programmable Logic Devices Feature Summary

• 128 Macrocells with expandable logic structure supporting up to 40 product terms per macrocell.
• In-System Programmability (ISP) via standard 4-pin JTAG interface (IEEE Std. 1149.1).
• Flexible I/O control with individual slew rate, open-collector, and pin-keeper options.
• Advanced power management including automatic standby, pin-controlled power-down, and reduced-power macrocell modes.

Complex Programmable Logic Devices Applications

• PCI-compliant interface designs requiring high current drivers.
• Complex logic integration replacing multiple TTL/SSI/MSI components.
• Systems requiring in-field design modifications via software programming.
• Boundary-scan testing applications compliant with IEEE 1149.1.

Complex Programmable Logic Devices Procurement Notes

Verify the specific suffix 'QI' against official Microchip documentation to confirm package type (likely PQFP-160) and temperature grade (Industrial). Confirm availability status as older CPLD families may have limited stock or end-of-life notifications. Ensure design tools support the ATF1508AS architecture for compilation and ISP programming.

Complex Programmable Logic Devices Selection Notes

Select this component when 128 macrocells are sufficient for the logic density requirements. Choose the 'AS' variant for standard performance over the 'L' (low power) version if higher speed or different power characteristics are needed. Verify that the 160-pin package fits the PCB layout constraints. Ensure the design compiler supports the enhanced routing resources and buried feedback features for optimal utilization.

Complex Programmable Logic Devices Part Context

This part belongs to the ATF1508AS series of Electrically Erasable PLDs. It shares architectural similarities with other members like ATF1508AS-15QC100 but differs in package count (160 vs 100 pins) and potentially I/O distribution. The 'AS' designation indicates standard performance levels compared to low-power variants.

Complex Programmable Logic Devices Replacement Considerations

Direct replacements must match the 128 macrocell count and 160-pin PQFP package. Consider ATF1508AS variants with different speed grades (e.g., -10, -20) if timing permits. Cross-family migration to newer Microchip CPLDs may require significant design restructuring due to architectural differences.

Complex Programmable Logic Devices FAQ

What is the maximum operating frequency for registered operations?

The ATF1508AS supports registered operation up to 125 MHz.

How does the device handle unused input pins?

The device offers a programmable pin-keeper option that holds floating inputs at their last known state, eliminating the need for external pull-up resistors and reducing noise.

Can the JTAG pins be used as general I/O?

Yes, if JTAG boundary-scan or ISP functionality is not required in the design, the four JTAG control pins can be configured as general-purpose I/O pins.