Microchip Technology ATF1504ASL-25QI100

Overview

ATF1504ASL-25QI100 from Microchip Technology (formerly Atmel) is a high-density, electrically-erasable Complex Programmable Logic Device (CPLD) with 64 macrocells, 7.5 ns pin-to-pin delay, and support for 125 MHz registered operation. It features in-system programmability via IEEE 1149.1 JTAG, three global clock inputs, and operates across -40°C to +85°C industrial temperature range in a 100-lead TQFP package. It is used in legacy PCI-compliant control logic, board-level glue logic replacement, and reconfigurable digital state machines.

For engineers reviewing the ATF1504ASL-25QI100 datasheet, ATF1504ASL-25QI100 pinout, ATF1504ASL-25QI100 application, or ATF1504ASL-25QI100 equivalent, key selection criteria include industrial-grade temperature support, JTAG boundary-scan compliance, programmable slew rate per output, macrocell-level power reduction, and dual-voltage I/O (3.3 V / 5.0 V) compatibility.

Technical Context

The ATF1504ASL-25QI100 implements a hierarchical CPLD architecture with four logic blocks, each fed by a 40-signal global bus and regional foldback buses. Its macrocells support configurable D/T/latch flip-flops, individual product-term clock enables, and asynchronous reset/preset sourced from global signals or dedicated product terms.

It integrates IEEE 1149.1a-compliant boundary-scan logic with dedicated TDI/TDO/TMS/TCK pins, supports PCI electrical requirements via programmable high-drive outputs, and includes Input Transition Detection (ITD) circuits on global clocks, inputs, and I/Os for edge-sensitive wake-up functionality.

Key Specifications

Pinout & Package

ATF1504ASL-25QI100 is housed in a 100-lead Thin Quad Flat Package (TQFP) with 0.5 mm lead pitch and exposed thermal pad. Pin functions are defined per the official Microchip pinout diagram for the 100-lead TQFP variant (Rev. 0950N–PLD–07/02).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar CPLD-based logic integration applications.

Compared with XC9572XL-10VQG64C and EPM3064ATC100-10N, the ATF1504ASL-25QI100 uniquely combines industrial temperature operation, dual-voltage I/O, programmable slew rate, and Input Transition Detection - making it optimal for ruggedized, mixed-signal, and field-upgradable embedded control.

Availability

ATF1504ASL-25QI100 is available at Aetrix Electronics and suitable for industrial control logic, PCI bus interface design, and legacy system emulation requiring stable component supply and long-term lifecycle support.

Supply support for ATF1504ASL-25QI100 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

Microchip Technology acquired Atmel in 2016 and maintains full support for the ATF1504AS(L) CPLD family, including documentation, programming tools, and long-term manufacturing commitments.

The ATF1504AS(L) product line was designed for high-reliability, field-programmable glue logic in industrial, automotive, and communications infrastructure - emphasizing in-system reprogrammability, robust power management, and IEEE-compliant testability.

FAQ

What is the maximum operating frequency of the ATF1504ASL-25QI100?

The ATF1504ASL-25QI100 supports registered operation up to 125 MHz, as confirmed by its -25 speed grade (tCNT = 8 ns minimum global clock period). This frequency applies to register-to-register paths under industrial temperature conditions with VCCIO = 5.0 V. Combinatorial paths achieve up to 166.7 MHz fMAX depending on routing and loading.

Does the ATF1504ASL-25QI100 support both 3.3 V and 5.0 V I/O interfaces simultaneously?

Yes, the ATF1504ASL-25QI100 supports mixed-voltage operation: VCCIO pins accept either 3.0–3.6 V or 4.75–5.25 V, allowing individual banks to interface with 3.3 V or 5.0 V logic families. The device does not require external level shifters, and voltage selection is configured at power-up via VCCIO pin voltage.

How does the pin-keeper feature work on the ATF1504ASL-25QI100?

The ATF1504ASL-25QI100 includes programmable pin-keeper circuits on all inputs and I/Os. When enabled, these weak keeper networks hold the last driven logic state (high or low) after the driving source is removed - preventing floating inputs, reducing system noise, and eliminating external pull-up resistors. Configuration is done during JEDEC file generation.

Is the ATF1504ASL-25QI100 JTAG boundary-scan compliant?

Yes, the ATF1504ASL-25QI100 fully complies with IEEE Std. 1149.1-1990 and 1149.1a-1993 for boundary-scan testing. It implements dedicated TDI, TDO, TMS, and TCK pins with full BSDL support, enabling board-level interconnect testing, in-system programming, and device identification without removing the part from the PCB.

What power management features does the ATF1504ASL-25QI100 offer beyond standby mode?

Beyond automatic 10 µA standby, the ATF1504ASL-25QI100 provides pin-controlled power-down (<10 mA), per-macrocell reduced-power bits, programmable slew rate per output, and Input Transition Detection (ITD) for event-driven wake-up. These features allow granular power optimization across logic density, activity, and signal integrity requirements.