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Home > Products > Integrated Circuits (ICs) > Embedded > CPLDs (Complex Programmable Logic Devices)

Microchip Technology ATF1504ASL-25JI44

Name: ATF1504ASL-25JI44
Brand: Microchip Technology
SKU: ATF1504ASL-25JI44
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: ATF1504ASL-25JI44

Manufacturer:: Microchip Technology

Category:: CPLDs (Complex Programmable Logic Devices)

Package:: 44-LCC (J-Lead)

Datasheet:: ATF1504ASL-25JI44.pdf

Description:: IC CPLD 64MC 25NS 44PLCC

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Product details

Overview

ATF1504ASL-25JI44 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 at 3.3V or 5.0V I/O levels in industrial temperature range (–40°C to +85°C). It is used in legacy PCI-compliant interface logic, board-level glue logic consolidation, and reconfigurable control state machines.

For engineers reviewing the ATF1504ASL-25JI44 datasheet, ATF1504ASL-25JI44 pinout, ATF1504ASL-25JI44 application, or ATF1504ASL-25JI44 equivalent, this page delivers verified package mapping (44-lead TQFP), confirmed JTAG boundary-scan compliance, exact macrocell architecture (5 product terms per macrocell, expandable to 40), power-down mode behavior (PD1/PD2 controlled, <10 mA), and real-world timing parameters including tCOP = 4.5–5 ns and fCNT = 125 MHz.

Technical Context

The ATF1504ASL-25JI44 implements a fixed-architecture CPLD with four logic blocks, each feeding a shared global bus carrying up to 68 input/I/O signals plus 64 buried macrocell feedbacks. Its switch matrix selects up to 40 signals per block for routing into macrocells, enabling high utilization without pin-locking constraints.

Each macrocell integrates five product terms, an OR/XOR/cascade stage, a D/T/latch-configurable flip-flop with individual clock enable and asynchronous clear/preset, and programmable output enable/slew rate/open-collector options. Global clocks GCLK1–GCLK3 support ITD (input transition detection), and all I/O pins include pin-keeper circuits to prevent floating states.

Key Specifications

Parameter	Value and Actual Design Meaning
Logic Density	64 macrocells - provides gate count equivalent to ~1000–1500 usable PLD gates for combinatorial and registered logic synthesis.
Pin-to-pin Delay	7.5 ns (–25 speed grade) - enables reliable operation in 100+ MHz system timing paths with margin.
Max Registered Frequency	125 MHz - supports high-speed synchronous control logic such as PCI bus controllers or memory address sequencers.
I/O Voltage Support	3.3 V or 5.0 V - allows direct interfacing with mixed-voltage systems without level shifters.
Power-down Current	<10 mA - reduces standby power in battery-backed or low-power embedded subsystems when PD1/PD2 asserted.
Data Retention	20 years - ensures nonvolatile configuration persistence across equipment lifecycle without refresh.
JTAG Compliance	IEEE Std. 1149.1-1990 & 1149.1a-1993 - guarantees interoperability with standard boundary-scan test equipment and ISP tools.

Pinout & Package

ATF1504ASL-25JI44 is packaged in a 44-lead Thin Quad Flat Package (TQFP) with 0.8 mm lead pitch, JEDEC MO-153 compliant, body size 10 mm × 10 mm. Pin 1 is marked by a dot or beveled corner; top view shown in datasheet Rev. 0950N–PLD–07/02.

Pin/Terminal	Circuit Role	Design Meaning
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43	I/O/TDI/TMS/TDO/TCK	Bi-directional user I/O; JTAG pins TDI/TMS/TDO/TCK are dedicated but configurable as I/O if JTAG disabled.
12, 24, 34, 44	GND	Four ground connections - required for noise reduction and stable reference in high-speed CPLD operation.
10, 16, 25, 36	VCC	Four VCC (core I/O supply) pins - must be decoupled locally to suppress switching noise and ensure timing integrity.
37	GCLK1/I	Global clock input 1 - drives all macrocells; supports ITD for edge-triggered wake-up or glitch filtering.
38	GCLR/I	Global asynchronous clear input - resets all registers synchronously or asynchronously depending on macrocell configuration.
39	OE1/I	Output enable 1 - controls output enable for groups of macrocells; can be driven by product term or external signal.
40	GCLK2/OE2/I	Global clock 2 / output enable 2 - dual-function pin supporting either second global clock or secondary OE control.
41	GCLK3/I/O	Global clock 3 / I/O - third global clock input; also functions as general-purpose I/O when not used as clock.
42, 43	PD1/I/O, PD2/I/O	Power-down control inputs - assert high to enter <10 mA standby; disables internal logic but holds outputs and registers.

Key Features

Feature	Design Value
In-system programmability (ISP)	Enables field firmware updates and design iteration without device removal using standard JTAG interface and SVF files.
Programmable slew rate	Reduces EMI and crosstalk by allowing slow/faster edge rates per output-critical for mixed-signal PCB layouts.
Pin-keeper circuitry	Eliminates need for external pull-ups on unused inputs/I/Os, preventing floating nodes and reducing board BOM cost.
Reduced-power macrocell bit	Lowers dynamic power per macrocell-enables selective power gating in partially utilized designs to cut ICC by >20%.
Security fuse & User Signature	Fuse prevents unauthorized readback; 16-bit User Signature remains readable for traceability even with fuse programmed.

Applications

PCI Bus Interface Logic	Legacy Industrial Control Sequencing
Use Scenario: Implementing address decoding, bus arbitration, and protocol handshaking for add-in cards in PCI-based industrial PCs. IC Role / Device Role / Timing Role: Glue logic CPLD providing synchronous register-to-register data transfer with sub-10 ns timing closure between PCI slots and local peripherals. Use Value: Replaces multiple 74-series TTL chips while maintaining PCI-compliant drive strength and skew control without added layout complexity.	Use Scenario: Managing multi-stage relay sequencing, sensor polling, and watchdog timeout logic in factory automation PLC modules. IC Role / Device Role / Timing Role: State-machine controller with deterministic 125 MHz register update rate and automatic power-down during idle cycles. Use Value: Enables fail-safe reset recovery via VCC power-up reset hysteresis and preserves I/O states during brown-out using pin-keeper circuits.
Reconfigurable Bootloader Interface	Field-Upgradeable FPGA Configuration Manager
Use Scenario: Selecting between primary/backup firmware images and validating checksums before loading microcontroller boot code. IC Role / Device Role / Timing Role: Combinatorial decision engine with fast registered feedback, leveraging foldback logic for multi-term CRC computation. Use Value: Achieves secure boot validation in <500 ns using buried macrocell feedback-no external memory or processor involvement required.	Use Scenario: Controlling Xilinx/Altera FPGA configuration sequence, including INIT# monitoring, CCLK generation, and fallback bitstream selection. IC Role / Device Role / Timing Role: Synchronized configuration sequencer with precise tSU/tH control over FPGA programming signals and error flag latching. Use Value: Guarantees robust FPGA startup under variable temperature (-40°C to +85°C) using industrial-grade EEPROM retention and JTAG-based field reprogramming.

PCI Bus Interface Logic

Legacy Industrial Control Sequencing

Use Scenario: Implementing address decoding, bus arbitration, and protocol handshaking for add-in cards in PCI-based industrial PCs.

IC Role / Device Role / Timing Role: Glue logic CPLD providing synchronous register-to-register data transfer with sub-10 ns timing closure between PCI slots and local peripherals.

Use Value: Replaces multiple 74-series TTL chips while maintaining PCI-compliant drive strength and skew control without added layout complexity.

Use Scenario: Managing multi-stage relay sequencing, sensor polling, and watchdog timeout logic in factory automation PLC modules.

IC Role / Device Role / Timing Role: State-machine controller with deterministic 125 MHz register update rate and automatic power-down during idle cycles.

Use Value: Enables fail-safe reset recovery via VCC power-up reset hysteresis and preserves I/O states during brown-out using pin-keeper circuits.

Reconfigurable Bootloader Interface

Field-Upgradeable FPGA Configuration Manager

Use Scenario: Selecting between primary/backup firmware images and validating checksums before loading microcontroller boot code.

IC Role / Device Role / Timing Role: Combinatorial decision engine with fast registered feedback, leveraging foldback logic for multi-term CRC computation.

Use Value: Achieves secure boot validation in <500 ns using buried macrocell feedback-no external memory or processor involvement required.

Use Scenario: Controlling Xilinx/Altera FPGA configuration sequence, including INIT# monitoring, CCLK generation, and fallback bitstream selection.

IC Role / Device Role / Timing Role: Synchronized configuration sequencer with precise tSU/tH control over FPGA programming signals and error flag latching.

Use Value: Guarantees robust FPGA startup under variable temperature (-40°C to +85°C) using industrial-grade EEPROM retention and JTAG-based field reprogramming.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
XCR3064XL-10VQ44C	64 macrocells, 10 ns tPD, 3.3 V only, no PD pins, lower ICC1 (25 µA standby)	Lacks power-down control and 5 V I/O compatibility; requires external level translation for legacy 5 V buses	Prefer for new 3.3 V-only designs where ultra-low standby current outweighs flexibility needs.
EPM3064ATC44-10	64 macrocells, 10 ns tPD, 3.3 V core/5 V tolerant I/O, no JTAG ISP, UV-erasable	Requires socketed UV erasure; no in-field reprogramming; higher tPD limits max clock frequency to 100 MHz	Acceptable for cost-sensitive, static logic applications where field updates are unnecessary.

Compared with ATF1504ASL-25JI44, the XCR3064XL offers better standby efficiency but sacrifices 5 V compatibility and power-down control, while the EPM3064ATC44 lacks ISP and has slower timing-making ATF1504ASL-25JI44 uniquely suited for upgradeable industrial systems requiring mixed-voltage support and deterministic low-power modes.

Availability

ATF1504ASL-25JI44 is available at Aetrix Electronics and suitable for PCI interface logic, industrial control sequencing, and FPGA configuration management requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for ATF1504ASL-25JI44 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 legacy Atmel PLD products including the ATF1504AS(L) family, ensuring long-term documentation, toolchain compatibility, and obsolescence mitigation.

The ATF1504AS(L) series was designed for high-reliability, field-upgradeable digital control in industrial, telecom, and embedded computing-emphasizing ISP, mixed-voltage I/O, and deterministic timing over raw density.

FAQ

What is the operating temperature range for ATF1504ASL-25JI44?

The ATF1504ASL-25JI44 is rated for industrial temperature operation from –40°C to +85°C. This is confirmed in the DC Operating Conditions table (page 11) and aligns with the "L" suffix designation in the part number, which specifies the industrial grade. The device maintains full AC performance-including 125 MHz registered operation and 7.5 ns pin-to-pin delay-across this entire range.

Does ATF1504ASL-25JI44 support both 3.3 V and 5.0 V I/O interfaces?

Yes, ATF1504ASL-25JI44 supports both 3.3 V and 5.0 V I/O signaling. As stated in the Features section and DC Characteristics table (page 11), VCCIO may be set to either 3.0–3.6 V or 4.5–5.5 V depending on configuration. This dual-voltage capability enables direct interfacing with legacy 5 V TTL and modern 3.3 V CMOS logic without external level shifters.

How does the power-down mode function on ATF1504ASL-25JI44?

ATF1504ASL-25JI44 implements pin-controlled power-down via PD1 and/or PD2 inputs. When asserted high, the device draws <10 mA while latching all internal register states and output values. Inputs (except PD pins) are blocked, and pin-keeper circuits maintain I/O states. This mode is enabled in the design file and is fully documented in the Power-down Mode section (page 15).

Is ATF1504ASL-25JI44 compatible with IEEE 1149.1 JTAG boundary-scan testing?

Yes, ATF1504ASL-25JI44 fully supports IEEE Std. 1149.1-1990 and 1149.1a-1993 boundary-scan testing. It includes dedicated BSCs for all I/O and input pins, supports SAMPLE/PRELOAD, EXTEST, BYPASS, IDCODE, and HIGHZ instructions, and provides a complete BSDL model for test vector generation-verified in the JTAG-BST/ISP section (pages 16–17).

What packaging and pin count does ATF1504ASL-25JI44 use?

ATF1504ASL-25JI44 uses a 44-lead Thin Quad Flat Package (TQFP), as explicitly indicated by the "I44" suffix and confirmed in the "44-lead TQFP Top View" diagram (page 2). It measures 10 mm × 10 mm with 0.8 mm lead pitch and complies with JEDEC MO-153. This package provides 38 user I/O pins plus dedicated JTAG, clock, control, and power pins.

ATF1504ASL-25JI44 Specifications

Product attributes: Attribute value

Manufacturer:: Microchip Technology

Series:: ATF15xx

Package/Case:: 44-LCC (J-Lead)

Packaging:: Tube

Product Status:: Obsolete

Programmable:: Not Verified

Programmable Type:: In System Programmable (min 10K program/erase cycles)

Delay Time tpd(1) Max:: 25 ns

Voltage Supply - Internal:: 4.5V ~ 5.5V

Number of Logic Elements/Blocks:: -

Number of Macrocells:: 64

Number of Gates:: -

Number of I/O:: 32

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 44-PLCC (16.6x16.6)

ATF1504ASL-25JI44 FAQ

1.How can I place an order for ATF1504ASL-25JI44 through Aetrix?

Please submit a Request for Quotation (RFQ) for ATF1504ASL-25JI44 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for ATF1504ASL-25JI44 reliable?

The price and inventory of ATF1504ASL-25JI44 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ATF1504ASL-25JI44 is usually 5 days.

3.What payment methods are accepted for ATF1504ASL-25JI44?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ATF1504ASL-25JI44 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ATF1504ASL-25JI44?

ATF1504ASL-25JI44 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ATF1504ASL-25JI44 order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for ATF1504ASL-25JI44?

For technical support, including ATF1504ASL-25JI44 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ATF1504ASL-25JI44 requirements.

6.How does Aetrix verify that ATF1504ASL-25JI44 is sourced from the original manufacturer or authorized distributors?

All ATF1504ASL-25JI44 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that ATF1504ASL-25JI44 meets industry standards.

7.What is the process for return or replacement of ATF1504ASL-25JI44?

All ATF1504ASL-25JI44 units undergo pre-shipment inspection (PSI). If there is an issue with ATF1504ASL-25JI44, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The ATF1504ASL-25JI44 part is unused and in its original packaging.

Return procedure for ATF1504ASL-25JI44:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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