Microchip Technology ATF1502AS-10AC44

Overview

ATF1502AS-10AC44 from Atmel is a high-performance, electrically-erasable Complex Programmable Logic Device (CPLD) with 32 macrocells, 5 product terms per macrocell (expandable to 40), 44-pin TQFP package, 7.5 ns maximum pin-to-pin delay, and registered operation up to 125 MHz. It integrates legacy TTL/SSI/MSI logic and supports PCI-compliant 5V I/O in industrial temperature range (–40°C to +85°C).

For engineers reviewing the ATF1502AS-10AC44 datasheet, ATF1502AS-10AC44 pinout, ATF1502AS-10AC44 application, or ATF1502AS-10AC44 equivalent, key selection criteria include JTAG ISP capability, programmable slew rate and open-collector outputs, three global clock inputs with ITD circuits, power-down mode via PD1/PD2 pins, and PCI-compliant drive strength (IOH = –44 mA, IOL = 95 mA at test points).

Technical Context

The ATF1502AS-10AC44 implements a flexible macrocell architecture with five sections per macrocell: product term array with 5 base terms (expandable via cascade logic), OR/XOR/CASCADE logic for sum-of-products and arithmetic functions, D/T/JK/SR flip-flop with individual clock enable and asynchronous reset/preset, output select/enable with programmable slew rate and open-collector option, and logic array feedback routing.

Its global bus carries all 32 macrocell buried feedback signals plus all I/O and dedicated input pins; each logic block's switch matrix selects up to 40 signals from this bus. Foldback logic enables regional fan-in of up to nine product terms, while Input Transition Detection (ITD) on global clocks, inputs, and I/O supports low-power state retention and event-triggered wake-up in industrial systems.

Key Specifications

Pinout & Package

ATF1502AS-10AC44 is housed in a 44-lead Thin Quad Flat Package (TQFP) with 0.8 mm lead pitch, JEDEC MO-153 compliant, and RoHS-6 certified. Pin 1 is marked by dot or beveled corner; package dimensions are 10 mm × 10 mm × 1.4 mm.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar CPLD applications.

Compared with XCR3064XL-10VQ44C and EPM3032ATC44-10, the ATF1502AS-10AC44 uniquely delivers native 5V PCI drive strength, integrated ITD for event-driven wake-up, and pin-keeper circuits eliminating external bias resistors - critical for cost-sensitive industrial retrofits and automotive I/O consolidation.

Availability

ATF1502AS-10AC44 is available at Aetrix Electronics and suitable for industrial PLCs, PCI add-in cards, and automotive body control units requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for ATF1502AS-10AC44 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Atmel (now part of Microchip Technology) is a semiconductor manufacturer specializing in non-volatile memory, microcontrollers, and programmable logic devices for industrial, automotive, and communications markets.

The ATF1502AS series was designed as a high-reliability, in-system programmable CPLD targeting replacement of legacy discrete logic and early PLDs in mission-critical control applications with stringent timing and environmental requirements.

FAQ

What is the maximum operating frequency of the ATF1502AS-10AC44?

The ATF1502AS-10AC44 supports a maximum internal global clock frequency of 125 MHz (fCNT) and an overall system clock frequency up to 166.7 MHz (fMAX). Its 7.5 ns pin-to-pin delay (–10 speed grade) and 3 ns global clock high/low times enable reliable operation in high-speed control loops and bus interfaces. These values are measured under industrial conditions (–40°C to +85°C, VCC = 4.75–5.25 V) and assume proper PCB layout and termination.

Does the ATF1502AS-10AC44 support JTAG boundary-scan testing?

Yes, the ATF1502AS-10AC44 fully supports IEEE Std. 1149.1-1990 and 1149.1a-1993 boundary-scan testing. Each of its up to 32 I/O pins and four dedicated inputs has an associated boundary-scan cell (BSC), enabling comprehensive board-level interconnect testing. The device implements all five standard JTAG modes (SAMPLE/PRELOAD, EXTEST, BYPASS, IDCODE, HIGHZ) and requires no external TRST pin due to automatic TAP reset at power-up.

How does the power-down mode work on the ATF1502AS-10AC44?

The ATF1502AS-10AC44 features a pin-controlled power-down mode activated by driving either PD1 (pin 37) or PD2 (pin 38) high. When asserted, ICC drops below 1 mA while latching all register and output states; outputs in high-Z remain high-Z. Input signals (except PD pins) are blocked, but pin-keeper circuits maintain last-known logic levels. This mode is enabled in the design file and disables use of PD pins as logic inputs, though their macrocell resources remain available for foldback/cascade logic.

Is the ATF1502AS-10AC44 compatible with PCI bus specifications?

Yes, the ATF1502AS-10AC44 is explicitly designed for PCI compliance. It delivers –44 mA source current (IOH) and 95 mA sink current (IOL) at defined test points under 5V operation, meeting PCI electrical requirements without external drivers. Its low output-to-output skew and programmable slew rate further ensure signal integrity on shared PCI buses. DC parameters including VIH/VIL, VOL/VOH, and pin capacitance are fully specified for PCI signaling.

Can the ATF1502AS-10AC44 replace older PAL or GAL devices?

Yes, the ATF1502AS-10AC44 is widely used to replace obsolete PAL16L8, GAL16V8, and similar devices. Its 32 macrocells, 5–40 product term flexibility, and pin-compatible 44-pin TQFP footprint allow direct migration of legacy fuse maps using Atmel's POF2JED conversion tools. Unlike one-time-programmable PALs, the ATF1502AS-10AC44 supports unlimited in-system reprogramming via JTAG, enabling iterative debugging and field updates without hardware changes.