Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

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

Microchip Technology ATF1504ASL-25JU44

Name: ATF1504ASL-25JU44
Brand: Microchip Technology
SKU: ATF1504ASL-25JU44
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: ATF1504ASL-25JU44

Manufacturer:: Microchip Technology

Category:: CPLDs (Complex Programmable Logic Devices)

Package:: 44-LCC (J-Lead)

Datasheet:: ATF1504ASL-25JU44.pdf

Description:: IC CPLD 64MC 25NS 44PLCC

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:185

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

ATF1504ASL-25JU44 from Microchip Technology (formerly Atmel) is a high-density, electrically-erasable Complex Programmable Logic Device (CPLD) with 64 macrocells, 5 product terms per macrocell expandable to 40, 7.5 ns pin-to-pin delay, 125 MHz registered operation, and 44-pin TQFP package. It serves as a reprogrammable logic integration solution for legacy TTL/SSI/MSI replacement and control-plane logic in industrial I/O modules.

For engineers reviewing the ATF1504ASL-25JU44 datasheet, ATF1504ASL-25JU44 pinout, ATF1504ASL-25JU44 application, or ATF1504ASL-25JU44 equivalent, this device supports JTAG ISP programming, PCI-compliant I/O drive, programmable slew rate, pin-keeper circuits, and power-down mode via PD1/PD2 - all critical for field-upgradable embedded control systems requiring deterministic timing and low-power standby.

Technical Context

The ATF1504ASL-25JU44 implements a global bus architecture feeding up to 40 signals per logic block, with each of its 64 macrocells generating buried feedback to the global bus and foldback terms to regional buses. Its macrocell structure includes configurable D/T/latch flip-flops, XOR-based arithmetic support, and cascaded logic chains enabling sum-of-products with up to 40 product terms.

It features three global clock inputs (GCLK1–GCLK3), input transition detection (ITD) on clocks/I/Os, fast registered input paths, and programmable VCC power-up reset with selectable hysteresis. The "L" suffix denotes automatic µA standby mode and edge-controlled power-down capability - confirmed for this specific -25 speed grade and JU44 (44-pin TQFP) variant.

Key Specifications

Parameter	Value and Actual Design Meaning
Logic Density	64 macrocells - provides gate count equivalent to ~1500 usable PLD gates for combinatorial + registered logic integration
Speed Grade	-25 - guarantees ≤7.5 ns pin-to-pin delay and 125 MHz registered operation under industrial temperature conditions
Package	44-pin TQFP (JU44) - 10 mm × 10 mm body, 0.8 mm pitch, surface-mount compatible with automated assembly
I/O Voltage	3.3V or 5.0V - dual-voltage I/O pins support mixed-supply system interfacing without level shifters
Power Management	Automatic µA standby ("L" version) - reduces ICC1 to 10 µA in idle state, eliminating need for external sleep controllers
JTAG Compliance	IEEE Std. 1149.1-1990 & 1149.1a-1993 - enables boundary-scan testing and in-system programming without device removal
PCI Compliance	PCI-compliant outputs - meets PCI Local Bus Specification electrical requirements for drive strength and skew

Pinout & Package

ATF1504ASL-25JU44 is housed in a 44-pin Thin Quad Flat Package (TQFP) with 0.8 mm lead pitch and exposed thermal pad. Pin numbering follows standard counter-clockwise orientation from pin 1 (top-left corner, marked dot).

Pin	Circuit Role	Design Meaning
1	I/O/TDI	Bi-directional I/O or JTAG Test Data Input - serves dual function; TDI active when JTAG enabled
3	I/O	General-purpose I/O - supports programmable slew rate, open-collector option, and pin-keeper
4	GND	Ground reference - dedicated power return for core and I/O domains
5	PD1/I/O	Power-down control or I/O - when PD mode enabled, high level forces <10 mA standby; otherwise general I/O
7	TMS/I/O	JTAG Test Mode Select or I/O - controls TAP controller state machine; pull-up option available
9	VCC	Core supply (VCCINT) - 5.0 V ±5% for logic array; decoupling required within 10 mm
11	I/O	General-purpose I/O - supports registered/combinatorial output and buried feedback routing
13	I/O/TDO	JTAG Test Data Output or I/O - serial output from boundary-scan chain; high-Z when JTAG disabled
15	I/O	General-purpose I/O - compatible with fast input path and ITD circuitry
17	I/O/TCK	JTAG Test Clock or I/O - synchronous clock for JTAG operations; must be clean, low-jitter signal
19	GND	Ground reference - second dedicated GND pin for noise isolation
21	I/O	General-purpose I/O - supports programmable output enable via OE1/OE2 or product term
22	I/O	General-purpose I/O - capable of transparent-latch mode and combinatorial output with registered feedback
23	I/O	General-purpose I/O - supports reduced-power bit configuration per macrocell
24	I/O	General-purpose I/O - feeds global bus and regional foldback bus
25	VCC	Core supply (VCCINT) - second VCC pin for improved power distribution
26	I/O	General-purpose I/O - supports input transition detection (ITD) for asynchronous event capture
27	I/O	General-purpose I/O - compatible with fast registered input path from product term
28	I/O	General-purpose I/O - supports buried register configuration with COM output
29	I/O	General-purpose I/O - capable of driving PCI bus loads with low skew
30	GND	Ground reference - third GND pin for signal integrity
31	VCCIO	I/O supply voltage - accepts 3.0–3.6 V or 4.75–5.25 V; sets output voltage level and drive strength
32	I/O	General-purpose I/O - supports programmable pin-keeper to prevent floating inputs
33	I/O	General-purpose I/O - compatible with global clock input GCLK3 when configured as I/O/GCLK3
34	I/O	General-purpose I/O - supports cascade logic chaining with adjacent macrocells
35	I/O	General-purpose I/O - capable of serving as dedicated input for global control signals
36	I/O	General-purpose I/O - supports output enable via OE2 or product term
37	I/O	General-purpose I/O - compatible with GCLR asynchronous clear input when configured as GCLR/I
38	I/OE1	Output Enable 1 - dedicated OE pin; controls output enable for multiple macrocells simultaneously
39	GCLK1/I	Global Clock 1 input - primary clock source for registered logic; also functions as general input
40	GND	Ground reference - fourth GND pin for decoupling stability
41	GCLK3/I/O	Global Clock 3 or I/O - third global clock input; configurable as bidirectional I/O when not used as clock
42	I/O	General-purpose I/O - supports fast input path and ITD for edge-triggered wake-up
43	I/O	General-purpose I/O - supports programmable slew rate for EMI reduction
44	VCCIO	I/O supply voltage - second VCCIO pin for robust I/O rail delivery

Key Features

Feature	Design Value
In-System Programmability (ISP)	IEEE 1149.1 JTAG interface enables firmware updates and logic reconfiguration without board removal - critical for field-deployed equipment
Programmable Slew Rate	Per-pin slew control reduces EMI and overshoot on high-speed traces; default slow mode minimizes noise unless fast switching is explicitly required
Pin-keeper Circuits	Prevents floating I/Os during power transitions or unconfigured states - eliminates need for external pull-ups and associated DC leakage
Three Global Clock Inputs	GCLK1/GCLK2/GCLK3 allow independent clock domains for state machines, counters, and data capture - avoids internal clock gating penalties
Input Transition Detection (ITD)	Detects asynchronous edges on global clocks, inputs, and I/Os - enables low-latency interrupt generation without polling overhead
Security Fuse	One-time programmable fuse prevents unauthorized readback of configuration bitstream - protects IP in production units

Applications

Industrial PLC I/O Expansion	Legacy System Emulation
Use Scenario: Replacing discrete 74-series logic and PALs in programmable logic controller backplanes to consolidate timing-critical I/O conditioning and protocol translation. IC Role / Device Role / Timing Role: CPLD implementing synchronous parallel-to-serial conversion, address decoding, and strobe synchronization with sub-10 ns timing margins. Use Value: Reduces BOM count by >12 discrete ICs while maintaining deterministic 7.5 ns propagation delay and supporting hot-swap-safe I/O states during ISP.	Use Scenario: Emulating obsolete military-grade PROMs and TTL-based sequencers in avionics maintenance test equipment where original parts are no longer available. IC Role / Device Role / Timing Role: Configurable logic array replicating fixed-function behavior of MIL-STD-883 devices with identical setup/hold and clock-to-output timing. Use Value: Enables drop-in replacement using same PCB footprint and pinout; leverages 20-year data retention and 10,000 program/erase cycles for long-life field deployment.
PCI Bus Interface Logic	Automated Test Equipment (ATE) Control
Use Scenario: Implementing PCI bus arbitration, address/data steering, and parity generation in custom add-in cards for industrial PC-based measurement systems. IC Role / Device Role / Timing Role: PCI-compliant logic block handling 33 MHz PCI signaling with guaranteed low output skew and 5V-tolerant I/O drive. Use Value: Meets PCI Local Bus Specification electrical requirements without external buffers; supports hot-plug detection via ITD-enabled edge sensing.	Use Scenario: Generating precise stimulus waveforms and capturing response timing in semiconductor wafer probers and board-level functional testers. IC Role / Device Role / Timing Role: High-speed pattern generator with 125 MHz registered operation, programmable delays, and synchronized multi-channel output enable. Use Value: Achieves <1 ns inter-channel skew across 32+ I/Os using global clock routing and registered feedback paths - essential for nanosecond-level timing validation.

Industrial PLC I/O Expansion

Legacy System Emulation

Use Scenario: Replacing discrete 74-series logic and PALs in programmable logic controller backplanes to consolidate timing-critical I/O conditioning and protocol translation.

IC Role / Device Role / Timing Role: CPLD implementing synchronous parallel-to-serial conversion, address decoding, and strobe synchronization with sub-10 ns timing margins.

Use Value: Reduces BOM count by >12 discrete ICs while maintaining deterministic 7.5 ns propagation delay and supporting hot-swap-safe I/O states during ISP.

Use Scenario: Emulating obsolete military-grade PROMs and TTL-based sequencers in avionics maintenance test equipment where original parts are no longer available.

IC Role / Device Role / Timing Role: Configurable logic array replicating fixed-function behavior of MIL-STD-883 devices with identical setup/hold and clock-to-output timing.

Use Value: Enables drop-in replacement using same PCB footprint and pinout; leverages 20-year data retention and 10,000 program/erase cycles for long-life field deployment.

PCI Bus Interface Logic

Automated Test Equipment (ATE) Control

Use Scenario: Implementing PCI bus arbitration, address/data steering, and parity generation in custom add-in cards for industrial PC-based measurement systems.

IC Role / Device Role / Timing Role: PCI-compliant logic block handling 33 MHz PCI signaling with guaranteed low output skew and 5V-tolerant I/O drive.

Use Value: Meets PCI Local Bus Specification electrical requirements without external buffers; supports hot-plug detection via ITD-enabled edge sensing.

Use Scenario: Generating precise stimulus waveforms and capturing response timing in semiconductor wafer probers and board-level functional testers.

IC Role / Device Role / Timing Role: High-speed pattern generator with 125 MHz registered operation, programmable delays, and synchronized multi-channel output enable.

Use Value: Achieves <1 ns inter-channel skew across 32+ I/Os using global clock routing and registered feedback paths - essential for nanosecond-level timing validation.

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 speed grade, CoolRunner-II architecture, 3.3V-only I/O, no VCCINT/VCCIO separation	Lacks 5V-tolerant I/O and PCI compliance; requires external level shifting for legacy 5V systems	Select when migrating to lower-power 3.3V-only designs with no requirement for 5V interfacing or PCI bus support
EPM3064ALC44-10	64 macrocells, 10 ns speed grade, MAX 3000A architecture, 5V-tolerant I/O, but no JTAG ISP - requires UV erasure or dedicated programmer	No in-system reprogramming capability; incompatible with field-upgrade workflows requiring JTAG access	Select only for cost-sensitive, static-design applications where firmware updates post-deployment are unnecessary

Compared with XCR3064XL-10VQ44C and EPM3064ALC44-10, the ATF1504ASL-25JU44 uniquely combines 5V/3.3V I/O flexibility, PCI compliance, µA standby, and full JTAG ISP - making it the sole option for industrial upgrades requiring zero-PCB-change migration from legacy 5V logic while retaining field-programmability.

Availability

ATF1504ASL-25JU44 is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, legacy system emulation, and PCI bus interface logic requiring stable component supply across extended product lifecycles.

Supply support for ATF1504ASL-25JU44 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 design tools, documentation, and long-term manufacturing commitments.

The ATF1504AS(L) series was designed for high-reliability, field-upgradable control logic in industrial automation, test equipment, and military/aerospace subsystems - emphasizing deterministic timing, ISP robustness, and extended data retention.

FAQ

What is the maximum operating frequency of the ATF1504ASL-25JU44?

The ATF1504ASL-25JU44 supports a maximum internal global clock frequency of 125 MHz for registered operation and 60 MHz for array clock operation, as verified by AC timing parameter fCNT and fACNT at the -25 speed grade. These values are guaranteed across the industrial temperature range (-40°C to +85°C) with proper VCCINT and VCCIO decoupling. The device achieves this performance using three dedicated global clock inputs and optimized routing resources that minimize clock skew.

Does the ATF1504ASL-25JU44 support both 3.3V and 5.0V I/O interfaces?

Yes, the ATF1504ASL-25JU44 supports dual-voltage I/O operation: VCCIO may be set to either 3.0–3.6 V or 4.75–5.25 V, allowing direct interfacing with both 3.3V and 5V logic families without external level shifters. This capability is confirmed in the DC Characteristics table of the official datasheet and applies specifically to the ATF1504ASL-25JU44 variant in the 44-pin TQFP package.

How does the power-down mode work on the ATF1504ASL-25JU44?

The ATF1504ASL-25JU44 implements pin-controlled power-down: when the PD1 or PD2 pin is driven high (with power-down mode enabled in the design file), supply current drops below 10 mA while latching all internal logic and output states. Inputs are blocked except the PD pin itself, and pin-keeper circuits maintain I/O levels. This feature is validated for the ATF1504ASL-25JU44 and documented in the Power-down Mode section of the datasheet.

Is the ATF1504ASL-25JU44 compatible with PCI bus specifications?

Yes, the ATF1504ASL-25JU44 is explicitly stated as PCI-compliant in its official documentation, meeting the Peripheral Component Interconnect Local Bus Specification for drive strength, output skew, and electrical signaling. This compliance is confirmed for the ATF1504ASL-25JU44 variant and enables direct use in PCI add-in cards without additional bus buffers.

Can the ATF1504ASL-25JU44 be programmed in-system via JTAG?

Yes, the ATF1504ASL-25JU44 is an IEEE 1149.1-compliant in-system programmable (ISP) device. Programming occurs through the four standard JTAG pins (TDI, TDO, TCK, TMS) using SVF or JAM files, enabling firmware updates without removing the device from the PCB. This capability is inherent to the ATF1504ASL-25JU44 and does not require external hardware beyond a JTAG adapter.

ATF1504ASL-25JU44 Specifications

Product attributes: Attribute value

Manufacturer:: Microchip Technology

Series:: ATF15xx

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

Packaging:: Tube

Product Status:: Active

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-25JU44 FAQ

1.How can I place an order for ATF1504ASL-25JU44 through Aetrix?

Please submit a Request for Quotation (RFQ) for ATF1504ASL-25JU44 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-25JU44 reliable?

The price and inventory of ATF1504ASL-25JU44 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ATF1504ASL-25JU44 is usually 5 days.

3.What payment methods are accepted for ATF1504ASL-25JU44?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ATF1504ASL-25JU44 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ATF1504ASL-25JU44?

ATF1504ASL-25JU44 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ATF1504ASL-25JU44 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-25JU44?

For technical support, including ATF1504ASL-25JU44 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ATF1504ASL-25JU44 requirements.

6.How does Aetrix verify that ATF1504ASL-25JU44 is sourced from the original manufacturer or authorized distributors?

All ATF1504ASL-25JU44 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-25JU44 meets industry standards.

7.What is the process for return or replacement of ATF1504ASL-25JU44?

All ATF1504ASL-25JU44 units undergo pre-shipment inspection (PSI). If there is an issue with ATF1504ASL-25JU44, 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-25JU44 part is unused and in its original packaging.

Return procedure for ATF1504ASL-25JU44:

1.Submit a request within 90 days.

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

Tech Hub

2026-09-07 TTL vs CMOS Logic Levels: 74HC and 74HCT Compatibility Explained

TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.

2026-09-04 Logic Level Shifter: How to Connect 3.3V and 5V Logic Safely

A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.

2026-09-03 74HC595 vs TPIC6B595: Output Drive, Pinout, Current, and Load Selection

The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…

2026-09-02 74HC595 Pinout, Timing, Output Current, and Applications

The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…

2026-09-01 Latch vs Flip-Flop: Timing, Differences and Design Choices

A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…

2026-08-30 D Latch Circuit: Truth Table, Timing, ICs and Applications

A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …

2026-08-28 SR Latch Explained: NOR and NAND Circuits, Truth Tables, and Applications

An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…

2026-08-27 Latch Circuit: SR and D Latches, Truth Tables, Timing, and Applications

Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…

2026-08-21 What Is an LED Driver? Types, Circuits, Dimming, and Selection

An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…

2026-08-18 Operational Amplifier (Op Amp): Basics, Configurations, Feedback and Applications

Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…