ATF1502ASV-15AC44

Overview

The ATF1502ASV-15AC44 is a high-performance, high-density complex programmable logic device (CPLD) utilizing electrically-erasable technology. It features 32 macrocells with up to 36 inputs and operates within a 3.0V to 3.6V supply range. The device offers a maximum pin-to-pin delay of 15 ns and supports registered operation up to 77 MHz. It includes enhanced routing resources, in-system programmability via JTAG, and advanced power management features such as pin-controlled standby mode.

Feature Summary

• 32 Macrocells with 5 product terms each, expandable to 40 via cascade logic
• In-System Programmability (ISP) via standard 4-pin JTAG interface
• Flexible Logic Macrocell supporting D/T latch configurable flip-flops
• Advanced Power Management including 0.75 mA standby mode and per-macrocell reduced-power options

Applications

• Integration of TTL, SSI, MSI, LSI, and classic PLD logic functions
• High-speed digital control systems requiring fast registered input from product terms
• Applications needing pin-locked design modifications with enhanced routing switch matrices

Procurement Notes

Verify the package type matches the required application, as the ATF1502ASV series is available in both 44-lead PLCC and TQFP configurations. Confirm that the commercial temperature range (0°C to 70°C) meets system requirements, or select the industrial variant if wider temperature tolerance is necessary. Ensure programming tools support the IEEE 1149.1 JTAG standard for in-system configuration.

Selection Notes

Select this component when 32 macrocells are sufficient for the design complexity. The -15 suffix indicates a 15 ns maximum delay, suitable for applications requiring up to 100 MHz clock frequencies. Consider the enhanced routing resources if the design requires significant pin-locking constraints. Verify that the 3.3V operating voltage aligns with the rest of the system's I/O levels.

Part Context

This part belongs to the ATF1502ASV family of CPLDs manufactured by Microchip Technology (formerly Atmel). The 'AC' suffix denotes the commercial temperature grade and 15 ns speed class. It is designed to replace older discrete logic and simple PLDs, offering higher density and reprogrammability through EEPROM technology.

Replacement Considerations

For industrial temperature requirements, consider the ATF1502ASV-15JI44. For lower speed requirements, the ATF1502ASV-20AC44 is available. Direct replacements must maintain the 44-pin footprint and 3.3V operation unless level shifting is implemented.

FAQ

What is the maximum number of product terms available per macrocell?

Each macrocell has 5 product terms, which can be expanded up to 40 product terms using the cascade logic feature.

How does the device handle unused input pins?

The ATF1502ASV offers a programmable pin-keeper option that holds floating input and I/O pins at their previous state, preventing unnecessary power consumption and system noise without external pull-up resistors.

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

Yes, if JTAG boundary-scan testing or in-system programming is not required, the four JTAG control pins (TDI, TMS, TCK, TDO) can be configured as general-purpose I/O pins.