Microchip ATF1502AS-10JU44: A Comprehensive Overview of the CPLD Device

The Microchip ATF1502AS-10JU44 is a high-performance, low-power Complex Programmable Logic Device (CPLD) engineered for a wide range of digital logic applications. As part of the well-established ATF1500AS family, this device combines architectural efficiency with the reliability of non-volatile in-system programmability, making it a robust solution for interface bridging, state machine control, and glue logic.

Housed in a 44-pin Plastic Leaded Chip Carrier (PLCC) package, the ‘JU44’ suffix denotes the package type, which is suitable for through-hole or socket mounting in demanding environments. The device is built on Advanced CMOS Electrically Erasable (EE) technology, which allows for complete re-programmability both during development and in the final application. A key feature is its 10ns maximum pin-to-pin logic delay, enabling high-speed operation critical for modern digital systems.

Architecturally, the ATF1502AS contains 32 macrocells, organized into two logic blocks interconnected by a Programmable Interconnect Matrix (PIM). This structure provides a dense integration of logic gates (equivalent to 2,000 PLD gates) with flexible routing resources. Each macrocell can be configured for combinatorial or registered logic operations, with programmable clocking options including global and product-term driven signals.

The device supports 5.0V in-system programming (ISP) via the IEEE 1149.1 (JTAG) interface. This feature drastically simplifies the manufacturing process and enables field updates without removing the device from the circuit board. Furthermore, its 100% pin-locking architecture ensures that design changes during development do not alter the pre-assigned pinout, protecting the integrity of the board layout.

With fully deterministic timing, the CPLD's performance remains consistent regardless of design changes, a significant advantage for meeting critical setup and hold times. Its low-power operation is ideal for power-sensitive applications, and the robust I/O pins are compliant with 5V TTL/CMOS levels.

ICGOOODFIND: The Microchip ATF1502AS-10JU44 stands out as a versatile and dependable CPLD, offering an optimal blend of high speed, non-volatile storage, ease of use, and design security for complex digital logic implementations.

Keywords: CPLD, In-System Programming (ISP), JTAG, Non-Volatile, Macrocell