ATF1508AS-10QI160

Complex Programmable Logic Devices Overview

The ATF1508AS-10QI160 is a high-performance, high-density electrically-erasable complex programmable logic device (CPLD) manufactured by Microchip Technology. It features 128 macrocells with up to 40 product terms per macrocell and supports up to 96 I/O pins in a 160-lead PQFP package. The device operates at a maximum frequency of 125 MHz with a maximum pin-to-pin propagation delay of 10 ns. It supports both 3.3V and 5.0V I/O supplies, with VCCINT fixed at 5.0V. The component includes In-System Programmability (ISP) via JTAG, power management features, and is available in industrial temperature ranges.

Complex Programmable Logic Devices Feature Summary

• 128 Macrocells with flexible logic structure supporting up to 40 product terms per macrocell via cascade and foldback routing.
• In-System Programmability (ISP) using the standard 4-pin JTAG interface (IEEE Std. 1149.1).
• Dual voltage operation: VCCINT fixed at 5.0V for inputs, while VCCIO supports 3.3V or 5.0V for I/O outputs.
• Advanced power management including automatic standby mode, pin-controlled power-down, and individual macrocell reduced-power options.

Complex Programmable Logic Devices Applications

• Complex logic integration replacing multiple TTL, SSI, MSI, LSI, and classic PLDs.
• PCI-compliant interface designs requiring high current drivers.
• Systems requiring in-field design modifications via software without removing components from the PCB.
• Boundary-scan testing applications compliant with IEEE Std. 1149.1.

Complex Programmable Logic Devices Procurement Notes

Verify the specific suffix 'QI' against official Microchip documentation to confirm package type and temperature range, as datasheet references typically list 'QL' for 160-lead PQFP Industrial. Confirm availability status, as older CPLD families may have limited stock or end-of-life notifications. Ensure design files account for the specific pinout of the 160-lead PQFP package.

Complex Programmable Logic Devices Selection Notes

Select this component when high density (128 macrocells) and fast speed (10 ns delay) are required in a 160-pin form factor. Choose the AS variant over AL if low standby current (10 µA) is not the primary constraint and 5V I/O compatibility is needed. Ensure the design utilizes the enhanced routing resources for successful pin-locking. Verify that the application can support the 5V VCCINT requirement even if VCCIO is 3.3V.

Complex Programmable Logic Devices Part Context

The ATF1508AS belongs to the Atmel/Microchip ATF15xxAS family of EEPLDs. This series is known for its enhanced routing switch matrices and flexible macrocell architecture compared to earlier ATF15xxA devices. The 160-lead PQFP package provides the highest I/O count within this specific density class, suitable for large-scale logic implementations.

Complex Programmable Logic Devices Replacement Considerations

Direct pin-compatible replacements within the same package and speed grade should be verified via Microchip's cross-reference tools. Consider the ATF1508ASL variants if lower power consumption is critical, noting the difference in standby current. For newer designs, evaluate Microchip's MachXO or CrossLink-N families for modern FPGA capabilities, though these require different programming interfaces.

Complex Programmable Logic Devices FAQ

What is the relationship between VCCINT and VCCIO?

VCCINT must always be connected to a 5.0V supply to power the input buffers. VCCIO powers the I/O output drivers and can be connected to either 3.3V or 5.0V, allowing mixed-voltage operation.

How does the ATF1508AS achieve up to 40 product terms per macrocell?

Each macrocell has five base product terms. These can be expanded to 40 terms using cascade logic chains between neighboring macrocells and foldback logic terms routed through regional buses.

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

Yes. If JTAG Boundary-Scan Testing (BST) or In-System Programming (ISP) is not utilized, the four JTAG control pins (TCK, TMS, TDI, TDO) can be configured as standard I/O pins.