Microchip Technology ATF1504ASL-25AI44

Overview

ATF1504ASL-25AI44 from Microchip (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 JTAG, three global clock inputs, and operates at 3.3V or 5.0V I/O levels. This device integrates legacy TTL/SSI/MSI logic and replaces classic PLDs in industrial control and embedded interface glue logic.

For engineers reviewing the ATF1504ASL-25AI44 datasheet, ATF1504ASL-25AI44 pinout, ATF1504ASL-25AI44 application, or ATF1504ASL-25AI44 equivalent, key selection criteria include its 44-pin TQFP package, -25 speed grade (7.5 ns tPD), industrial temperature range (-40°C to +85°C), and dual-voltage I/O compatibility - all critical for board-level timing closure and long-life industrial deployment.

Technical Context

The ATF1504ASL-25AI44 implements a macrocell-based architecture with five product terms per macrocell (expandable to 40 via cascade logic), dedicated global clock pins (GCLK1–GCLK3), and ITD (Input Transition Detection) circuits on clocks, inputs, and I/Os. Its switch matrix selects up to 40 signals from a shared global bus containing all I/O and buried feedback paths.

Each macrocell supports configurable flip-flops (D/T/latch), programmable output slew rate, open-collector option, and individual register/output enable control. Power management includes automatic µA standby ("L" version), pin-controlled 1 mA power-down mode, and per-macrocell reduced-power bit - enabling dynamic power scaling without sacrificing timing integrity.

Key Specifications

Pinout & Package

ATF1504ASL-25AI44 is packaged in a 44-lead Thin Quad Flat Package (TQFP), 10 mm × 10 mm, 0.8 mm pitch, lead-free and RoHS-compliant. The package supports surface-mount reflow assembly and offers balanced signal routing for noise-sensitive industrial applications.

Key Features

Applications

Equivalent & Alternatives

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

Compared with XCR3064XL-10VQ44C and EPM3064ATC44-10N, the ATF1504ASL-25AI44 uniquely combines 5V/3.3V I/O tolerance, industrial temperature rating, µA standby, and pin-keeper logic - making it the only option qualified for long-lifecycle, mixed-voltage, noise-sensitive industrial control deployments.

Availability

ATF1504ASL-25AI44 is available at Aetrix Electronics and suitable for industrial PLC expansion, motor drive control logic, and legacy bus interface translation requiring stable component supply across 10+ year production programs.

Supply support for ATF1504ASL-25AI44 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 family, including datasheets, programming tools, and long-term supply assurance for industrial and automotive applications.

The ATF1504AS series was designed specifically for high-reliability, in-system reprogrammable glue logic in industrial automation, test equipment, and avionics - emphasizing timing predictability, voltage flexibility, and field-upgrade capability.

FAQ

What is the operating temperature range for ATF1504ASL-25AI44?

The ATF1504ASL-25AI44 is rated for industrial temperature operation from –40°C to +85°C. This specification is guaranteed across all AC and DC parameters in the datasheet, including 7.5 ns pin-to-pin delay and 125 MHz registered performance. The "I" suffix in the part number explicitly denotes industrial grade, and thermal derating is not required within this ambient range.

Does ATF1504ASL-25AI44 support both 3.3V and 5.0V I/O interfaces?

Yes, ATF1504ASL-25AI44 supports selectable 3.3V or 5.0V I/O operation via VCCIO pin configuration. When VCCIO = 5.0V, outputs drive TTL-compatible levels; when VCCIO = 3.3V, outputs meet CMOS thresholds. Input thresholds scale accordingly, and the device tolerates 5V inputs even when VCCIO = 3.3V - enabling safe mixed-voltage interfacing without external translators.

How many global clock inputs does ATF1504ASL-25AI44 provide?

The ATF1504ASL-25AI44 provides three dedicated global clock inputs: GCLK1, GCLK2, and GCLK3. Each can serve as a clock source for any macrocell, and individual product terms may also function as array clocks. This enables concurrent multi-domain timing - for example, running a UART baud generator on GCLK1, an ADC sample trigger on GCLK2, and a PWM carrier on GCLK3 - all within a single ATF1504ASL-25AI44 device.

What power-saving features are implemented in ATF1504ASL-25AI44?

ATF1504ASL-25AI44 includes three distinct power-saving mechanisms: (1) automatic µA standby mode activated during logic inactivity, (2) pin-controlled 1 mA power-down mode via PD1/PD2, and (3) per-macrocell reduced-power bit. All are configurable in the design file. In industrial operation, standby current is guaranteed ≤10 µA, and power-down mode reduces ICC to <10 mA while preserving register and output states.

Is ATF1504ASL-25AI44 compatible with IEEE 1149.1 JTAG boundary-scan testing?

Yes, ATF1504ASL-25AI44 fully complies with IEEE Std. 1149.1-1990 and 1149.1a-1993 for boundary-scan testing. It implements dedicated boundary-scan cells on all I/O and input pins, supports SAMPLE/PRELOAD, EXTEST, BYPASS, IDCODE, and HIGHZ JTAG instructions, and provides a complete BSDL model for test vector generation. JTAG functionality is enabled by default but can be disabled to reclaim TDI/TMS/TDO/TCK as general-purpose I/O.