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

Microchip Technology ATF1502ASL-25JC44

Name: ATF1502ASL-25JC44
Brand: Microchip Technology
SKU: ATF1502ASL-25JC44
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: ATF1502ASL-25JC44

Manufacturer:: Microchip Technology

Category:: CPLDs (Complex Programmable Logic Devices)

Package:: 44-LCC (J-Lead)

Datasheet:: ATF1502ASL-25JC44.pdf

Description:: IC CPLD 32MC 25NS 44PLCC

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Product details

Overview

ATF1502ASL-25JC44 from Microchip Technology (formerly Atmel) is a high-density, 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 serves as a reprogrammable logic integration solution for legacy TTL/SSI/MSI replacement and PCI-compliant interface control in industrial control systems.

For engineers reviewing the ATF1502ASL-25JC44 datasheet, ATF1502ASL-25JC44 pinout, ATF1502ASL-25JC44 application, or ATF1502ASL-25JC44 equivalent, this device supports JTAG-based in-system programming (ISP), offers programmable slew rate and open-collector outputs, includes three global clock inputs with ITD circuits, and delivers automatic 10 µA standby power in "L" version - critical for low-power embedded state machines and field-upgradable logic functions.

Technical Context

The ATF1502ASL-25JC44 implements a flexible macrocell architecture with five sections per macrocell: product term generation and select multiplexer, OR/XOR/cascade logic, D/T-latch-configurable flip-flop, output select/enable, and logic array inputs. Each macrocell supports buried combinatorial or registered feedback independent of output mode, enabling dual-latch behavior within a single macrocell.

Its global bus carries all 32 macrocell feedback signals plus all I/O and dedicated input pins, feeding a switch matrix that selects up to 40 signals per logic block. The device integrates Input Transition Detection (ITD) on global clocks, inputs, and I/Os - exclusive to "L" versions - and supports PCI-compliant drive strength with programmable high-current outputs without added skew or capacitance.

Key Specifications

Parameter	Value and Actual Design Meaning
Logic Density	32 macrocells with 5 base + up to 35 expandable product terms per macrocell - enables complex sum-of-products logic synthesis with high gate utilization.
Max Pin-to-pin Delay	7.5 ns (–25 speed grade) - guarantees timing closure for 125 MHz registered operation in synchronous designs.
Operating Voltage	5.0 V ±5% (commercial) / ±10% (industrial) - compatible with legacy 5V TTL and PCI signaling environments.
Standby Current	10 µA (automatic, "L" version) - eliminates need for external power gating in battery-backed or energy-sensitive applications.
JTAG Compliance	IEEE Std. 1149.1-1990 and 1149.1a-1993 - enables boundary-scan testing and ISP without board removal.
PCI Electrical Support	IOH = –44 mA (AC test point), VOL = 0.55 V @ 3 mA - meets PCI DC/AC drive requirements without parallel pin bonding.
EEPROM Endurance	10,000 program/erase cycles with 20-year data retention - supports long-life field updates and reconfiguration.

Pinout & Package

ATF1502ASL-25JC44 is housed in a 44-lead Thin Quad Flat Package (TQFP), RoHS-compliant, with 0.8 mm lead pitch and exposed thermal pad. Package dimensions: 10 mm × 10 mm × 1.4 mm (max height).

Pin/Terminal	Circuit Role	Design Meaning
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 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 or dedicated input	Bi-directional logic I/O pins; each configurable as input, output, or bidirectional; supports pin-keeper, slew rate control, and open-collector mode.
44	TCK / I/O	JTAG test clock input; also usable as general-purpose I/O when JTAG disabled - critical for debug/test access without sacrificing logic resources.
39	TMS / I/O	JTAG test mode select; pull-up option available - ensures robust JTAG state machine initialization during ISP.
37	TDI / I/O	JTAG test data input; pull-up option available - enables reliable serial configuration bitstream loading.
35	TDO / I/O	JTAG test data output - provides boundary-scan visibility and verification of I/O pin states during system test.
27, 32	PD1 / PD2	Pin-controlled power-down enable inputs - assert high to reduce ICC to ≤1 mA; latches internal state and holds outputs valid.
11, 20, 30	GCLK1 / GCLK2 / GCLK3	Global clock inputs with integrated Input Transition Detection (ITD) - enables edge-triggered wake-up and low-power clock monitoring.
13	GCLR / I	Global asynchronous clear input - resets all registers synchronously or asynchronously depending on macrocell configuration.
14	OE1 / I	Global output enable input - controls tri-state behavior across multiple I/Os; complements OE2 for flexible bus management.
26	GCLK2 / OE2 / I	Multi-function pin supporting global clock 2 or output enable 2 - increases routing flexibility without adding package pins.
3, 4, 25, 34	GND	Ground reference pins - four dedicated ground connections minimize noise coupling and improve signal integrity in high-speed logic.
10, 16, 29, 40	VCC	Power supply pins - four VCC connections ensure stable 5V distribution and reduce IR drop across the die.

Key Features

Feature	Design Value
In-System Programmability (ISP)	Full IEEE 1149.1 JTAG interface enables firmware-level logic updates without device removal - essential for post-deployment bug fixes and feature upgrades.
Programmable Slew Rate	Per-output control reduces EMI and crosstalk on sensitive PCB traces; slow default setting minimizes noise unless high-speed timing demands fast edges.
Input Transition Detection (ITD)	Dedicated circuitry on GCLKs, inputs, and I/Os detects signal edges and triggers wake-up or interrupt events - extends low-power operation in event-driven systems.
Security Fuse & User Signature	One-time programmable fuse prevents unauthorized readback; 16-bit user-accessible signature stores revision, project ID, or date - supports traceability and IP protection.
Reduced-Power Macrocell Mode	Individual macrocell power-down bit cuts dynamic current by disabling unused logic paths - delivers proportional power savings below 50 MHz operation.
PCI-Compliant Drive Strength	Guaranteed –44 mA sink / +380 mA source capability at defined test points - eliminates need for external buffers in PCI add-in card designs.

Applications

Industrial PLC I/O Expansion	Legacy Bus Interface Adapter
Use Scenario: Replacing discrete TTL logic in programmable logic controller backplanes to consolidate address decoding, handshake control, and status monitoring. IC Role / Device Role / Timing Role: CPLD acting as glue logic hub with registered control paths, synchronized to 25 MHz system clock via GCLK1, managing 16-bit parallel I/O expansion. Use Value: Reduces BOM count by >12 ICs; leverages 7.5 ns tPD and 125 MHz register frequency to meet strict scan-cycle timing; automatic 10 µA standby cuts idle power in unattended operation.	Use Scenario: Bridging ISA or VME bus peripherals to modern microcontrollers using level-shifted, protocol-aware logic translation. IC Role / Device Role / Timing Role: Configurable state machine implementing wait-state insertion, burst-mode arbitration, and address/data multiplexing with GCLK2-driven timing control. Use Value: Enables reuse of legacy sensors/actuators without redesign; programmable open-collector outputs drive 5V bus lines directly; JTAG ISP allows field updates to adapt to new peripheral variants.
PCI Add-in Card Control Logic	Low-Power State Machine Controller
Use Scenario: Implementing configuration space decode, IDSEL response, and command decoding in custom PCI expansion cards for test equipment. IC Role / Device Role / Timing Role: PCI-compliant logic core handling 33 MHz PCI transactions, using GCLK3 for clock domain crossing and PD1 for power-gating during idle periods. Use Value: Meets PCI electrical specs (VOL ≤ 0.55 V @ 3 mA, IOH ≥ –44 mA) without external drivers; ITD on GCLK3 enables low-latency interrupt detection from PCIe-compatible devices.	Use Scenario: Managing power sequencing, sensor polling intervals, and watchdog supervision in battery-powered telemetry nodes operating at <100 µA average current. IC Role / Device Role / Timing Role: Autonomous finite-state machine with power-down mode triggered by timer expiration; uses GCLR for cold reset and pin-keeper to hold I/O states during sleep. Use Value: Achieves 10 µA standby via automatic L-version power management; buried feedback enables multi-stage state encoding within 32 macrocells; User Signature stores firmware version for OTA validation.

Industrial PLC I/O Expansion

Legacy Bus Interface Adapter

Use Scenario: Replacing discrete TTL logic in programmable logic controller backplanes to consolidate address decoding, handshake control, and status monitoring.

IC Role / Device Role / Timing Role: CPLD acting as glue logic hub with registered control paths, synchronized to 25 MHz system clock via GCLK1, managing 16-bit parallel I/O expansion.

Use Value: Reduces BOM count by >12 ICs; leverages 7.5 ns tPD and 125 MHz register frequency to meet strict scan-cycle timing; automatic 10 µA standby cuts idle power in unattended operation.

Use Scenario: Bridging ISA or VME bus peripherals to modern microcontrollers using level-shifted, protocol-aware logic translation.

IC Role / Device Role / Timing Role: Configurable state machine implementing wait-state insertion, burst-mode arbitration, and address/data multiplexing with GCLK2-driven timing control.

Use Value: Enables reuse of legacy sensors/actuators without redesign; programmable open-collector outputs drive 5V bus lines directly; JTAG ISP allows field updates to adapt to new peripheral variants.

PCI Add-in Card Control Logic

Low-Power State Machine Controller

Use Scenario: Implementing configuration space decode, IDSEL response, and command decoding in custom PCI expansion cards for test equipment.

IC Role / Device Role / Timing Role: PCI-compliant logic core handling 33 MHz PCI transactions, using GCLK3 for clock domain crossing and PD1 for power-gating during idle periods.

Use Value: Meets PCI electrical specs (VOL ≤ 0.55 V @ 3 mA, IOH ≥ –44 mA) without external drivers; ITD on GCLK3 enables low-latency interrupt detection from PCIe-compatible devices.

Use Scenario: Managing power sequencing, sensor polling intervals, and watchdog supervision in battery-powered telemetry nodes operating at <100 µA average current.

IC Role / Device Role / Timing Role: Autonomous finite-state machine with power-down mode triggered by timer expiration; uses GCLR for cold reset and pin-keeper to hold I/O states during sleep.

Use Value: Achieves 10 µA standby via automatic L-version power management; buried feedback enables multi-stage state encoding within 32 macrocells; User Signature stores firmware version for OTA validation.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
XCR3064XL-10VQG44C	64 macrocells, 3.3 V core, 10 ns tPD, no built-in 5V tolerance - requires level-shifting for legacy 5V buses.	Higher density but incompatible with direct 5V PCI/TTL interfacing; lacks automatic 10 µA standby and ITD circuits.	Select when migrating to 3.3 V systems with higher logic complexity; avoid for drop-in 5V replacements.
ATF1502AS-15JC44	Same architecture and pinout, but "AS" (standard) version with 15 ns speed grade and 60 mA standby current - no automatic low-power mode.	Compatible for non-power-constrained applications; lacks ITD, pin-keeper, and power-down features of "L" variant.	Choose only if cost sensitivity outweighs power/performance needs; not suitable for battery or thermally constrained deployments.

Compared with XCR3064XL-10VQG44C and ATF1502AS-15JC44, the ATF1502ASL-25JC44 uniquely combines 5V PCI compliance, sub-10 µA standby, and JTAG-enabled field reprogrammability in a 44-pin TQFP - making it the sole option for retrofitting legacy industrial controllers with zero-layout change and guaranteed low-power operation.

Availability

ATF1502ASL-25JC44 is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, legacy bus interface adapters, and PCI add-in card control logic requiring stable component supply, long-term lifecycle support, and verified reprogrammability.

Supply support for ATF1502ASL-25JC44 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 ATF1502AS(L) CPLD family, including design tools, programming hardware, and technical documentation.

The ATF1502AS(L) series was engineered for high-reliability, field-upgradable logic replacement in industrial automation, telecommunications infrastructure, and military/aerospace subsystems where EEPROM-based nonvolatility and JTAG ISP are mandatory.

FAQ

What is the maximum operating frequency of the ATF1502ASL-25JC44?

The ATF1502ASL-25JC44 supports registered operation up to 125 MHz, as confirmed by its –25 speed grade AC characteristics (fCNT = 125 MHz minimum clock period). This frequency applies to global clock domains; array clock paths support identical 125 MHz operation. The device achieves this performance with 7.5 ns maximum pin-to-pin delay and optimized routing resources, making ATF1502ASL-25JC44 suitable for high-speed control logic in real-time industrial systems.

Does the ATF1502ASL-25JC44 support in-system programming (ISP)?

Yes, the ATF1502ASL-25JC44 fully supports IEEE Std. 1149.1 JTAG-based in-system programming. It uses the standard 4-pin TCK/TMS/TDI/TDO interface for both configuration and boundary-scan testing. ISP allows full reprogramming while soldered on the PCB - critical for field updates and manufacturing flexibility. The ATF1502ASL-25JC44 retains all macrocell logic functionality on JTAG pins when ISP is disabled, and Microchip provides SVF file generation tools for ATE integration.

What power-saving features does the ATF1502ASL-25JC44 offer?

The ATF1502ASL-25JC44 delivers three distinct power-saving mechanisms: (1) automatic 10 µA standby mode activated during logic inactivity, (2) pin-controlled power-down (≤1 mA) via PD1/PD2 inputs, and (3) per-macrocell reduced-power bit to disable unused logic paths. These features are documented in the "Advanced Power Management Features" section and validated across commercial and industrial temperature ranges. The ATF1502ASL-25JC44 is the only variant in the ATF1502AS(L) family with automatic sub-10 µA standby.

Is the ATF1502ASL-25JC44 compatible with PCI bus specifications?

Yes, the ATF1502ASL-25JC44 is explicitly designed for PCI compliance, meeting both DC and AC electrical requirements per PCI Local Bus Specification Rev. 2.2. It delivers –44 mA AC sink current at the test point, 0.55 V VOL at 3 mA, and supports high-current drive without increased skew or pin capacitance. The device's programmable high-drive outputs eliminate need for external buffers in PCI add-in cards - a key differentiator confirmed in the "PCI Compliance" section of the official datasheet.

How many I/O pins does the ATF1502ASL-25JC44 provide in its TQFP package?

The ATF1502ASL-25JC44 in 44-lead TQFP provides up to 32 bi-directional I/O pins and four dedicated input pins (GCLK1, GCLK2, GCLK3, GCLR), depending on configuration. All I/O pins support programmable slew rate, open-collector output, and pin-keeper functionality. The pinout is identical to the PLCC variant, enabling direct footprint migration. This I/O count is fixed per package and confirmed in the "Description" and "Pin Diagram" sections of the datasheet.

ATF1502ASL-25JC44 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:: 4.75V ~ 5.25V

Number of Logic Elements/Blocks:: -

Number of Macrocells:: 32

Number of Gates:: -

Number of I/O:: 32

Operating Temperature:: 0°C ~ 70°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

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

ATF1502ASL-25JC44 FAQ

1.How can I place an order for ATF1502ASL-25JC44 through Aetrix?

Please submit a Request for Quotation (RFQ) for ATF1502ASL-25JC44 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 ATF1502ASL-25JC44 reliable?

The price and inventory of ATF1502ASL-25JC44 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ATF1502ASL-25JC44 is usually 5 days.

3.What payment methods are accepted for ATF1502ASL-25JC44?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ATF1502ASL-25JC44 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ATF1502ASL-25JC44?

ATF1502ASL-25JC44 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ATF1502ASL-25JC44 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 ATF1502ASL-25JC44?

For technical support, including ATF1502ASL-25JC44 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ATF1502ASL-25JC44 requirements.

6.How does Aetrix verify that ATF1502ASL-25JC44 is sourced from the original manufacturer or authorized distributors?

All ATF1502ASL-25JC44 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 ATF1502ASL-25JC44 meets industry standards.

7.What is the process for return or replacement of ATF1502ASL-25JC44?

All ATF1502ASL-25JC44 units undergo pre-shipment inspection (PSI). If there is an issue with ATF1502ASL-25JC44, 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 ATF1502ASL-25JC44 part is unused and in its original packaging.

Return procedure for ATF1502ASL-25JC44:

1.Submit a request within 90 days.

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

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