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

Microchip Technology ATF1502ASL-25AI44

Name: ATF1502ASL-25AI44
Brand: Microchip Technology
SKU: ATF1502ASL-25AI44
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: ATF1502ASL-25AI44

Manufacturer:: Microchip Technology

Category:: CPLDs (Complex Programmable Logic Devices)

Package:: 44-TQFP

Datasheet:: ATF1502ASL-25AI44.pdf

Description:: IC CPLD 32MC 25NS 44TQFP

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Product details

Overview

ATF1502ASL-25AI44 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-25AI44 datasheet, ATF1502ASL-25AI44 pinout, ATF1502ASL-25AI44 application, or ATF1502ASL-25AI44 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 current in "L" low-power mode - critical for power-sensitive embedded control and field-upgradable logic designs.

Technical Context

The ATF1502ASL-25AI44 implements a flexible macrocell architecture with five sections per macrocell: product term array + PTMUX, 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, and foldback logic enables regional fan-in up to nine product terms.

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 IEEE 1149.1a-compliant JTAG boundary-scan, PCI-compliant 5V drive capability (±44 mA AC high, +95 mA AC low), and Input Transition Detection (ITD) on global clocks, inputs, and I/O - exclusive to "L" versions.

Key Specifications

Parameter	Value and Actual Design Meaning
Macrocell Count	32 macrocells - provides gate-equivalent logic density sufficient to replace multiple 74-series TTL packages or classic PLDs in control-plane logic.
Product Terms per Macrocell	5 base, expandable to 40 via cascade - enables implementation of wide sum-of-products logic functions without external glue logic.
Max Pin-to-pin Delay	7.5 ns - guarantees timing closure for synchronous logic operating at ≤125 MHz system clock rates.
Global Clock Frequency	Up to 125 MHz - supports high-speed register-to-register paths using GCLK1–GCLK3 with 3 ns minimum high/low time.
Standby Current	10 µA (automatic, "L" version) - eliminates need for external power gating in battery-backed or energy-harvesting systems.
JTAG Compliance	IEEE Std. 1149.1-1990 and 1149.1a-1993 - enables standardized boundary-scan testing and ISP without removing device from PCB.
PCI Drive Capability	±44 mA (high), +95 mA (low) - meets PCI Local Bus Rev. 2.2 DC/AC requirements without parallel pin tying or external drivers.

Pinout & Package

ATF1502ASL-25AI44 is housed in a 44-lead Thin Quad Flat Package (TQFP) with 0.8 mm lead pitch, JEDEC MS-026 compliant, RoHS-compliant matte tin lead finish. Thermal pad not present; body size 10 mm × 10 mm × 1.4 mm.

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; each configurable as input, output, or bidirectional; supports pin-keeper, slew rate control, and open-collector mode.
44	TDI/I/O	JTAG Test Data In - used for ISP programming and boundary-scan data input; retains macrocell logic resources when JTAG enabled.
3, 6, 11, 14, 23, 26, 30, 33, 36, 39, 42	GCLK1/I, GCLK2/OE2/I, GCLK3/I/O, GCLR/I, OE1/I	Global control pins - provide clock, clear, and output enable signals routed to all macrocells; support ITD for glitch-free asynchronous event detection.
27, 31	PD1/I/O, PD2/I/O	Pin-controlled power-down - asserts low-power mode (<1 mA) when driven high; disables logic transitions but holds register and output states.
17, 20, 24, 37	TMS/I/O, TDO, TCK, TDI/I/O	JTAG interface - implements IEEE 1149.1 test access port; pull-up option available on TMS/TDI for robust signal integrity.
4, 16, 25, 34, 41	GND	Ground reference - five dedicated ground pins minimize ground bounce and improve noise immunity in high-speed switching.
9, 18, 29, 38	VCC	5V supply - four VCC pins ensure stable core voltage delivery and reduce IR drop across the die during simultaneous switching.

Key Features

Feature	Design Value
In-System Programmability (ISP)	Enables field firmware updates and design iterations via standard 4-pin JTAG interface - no socket or UV eraser required.
Programmable Slew Rate	Per-output control reduces EMI and crosstalk on sensitive routing; slow default setting avoids overshoot on unterminated traces.
Input Transition Detection (ITD)	Detects edges on global clocks, inputs, and I/O without consuming macrocell resources - ideal for wake-on-event or interrupt generation.
Power-down Mode	Sub-1 mA quiescent current achieved by asserting PD1 or PD2 - preserves register state and output levels during sleep cycles.
Security Fuse & User Signature	Fuse prevents unauthorized readback; 16-bit user-accessible signature stores revision, project ID, or date - survives fuse programming.

Applications

Industrial PLC I/O Expansion	Legacy System TTL Replacement
Use Scenario: Adding isolated digital input/output channels to a programmable logic controller chassis with space and power constraints. IC Role / Device Role / Timing Role: Configurable logic engine implementing debounce, edge detection, and protocol translation between field sensors and backplane bus. Use Value: Replaces 8–12 discrete 74HCxx chips with single ATF1502ASL-25AI44, reducing BOM count, board area, and assembly cost while enabling post-deployment logic updates.	Use Scenario: Modernizing aging avionics test equipment requiring direct compatibility with obsolete 74LS154 decoders and 74LS175 registers. IC Role / Device Role / Timing Role: Pin-compatible logic emulation layer translating legacy control signals into FPGA-friendly formats with deterministic 7.5 ns propagation. Use Value: Eliminates obsolescence risk without redesigning PCB layout - leverages existing 44-pin footprint and 5V supply rail while supporting JTAG verification.
PCI Bus Interface Logic	Field-Upgradeable Control Sequencer
Use Scenario: Implementing address decoding, bus arbitration, and configuration space mapping in a PCI add-in card for industrial data acquisition. IC Role / Device Role / Timing Role: PCI-compliant logic block driving IDSEL, FRAME#, IRDY#, and TRDY# with ±44 mA drive strength and <5 ns skew. Use Value: Meets PCI Local Bus Rev. 2.2 electrical specs without external buffers - simplifies compliance testing and reduces component count in high-reliability applications.	Use Scenario: Managing boot sequence, sensor calibration, and safety interlock logic in medical diagnostic hardware where firmware patches must update control flow. IC Role / Device Role / Timing Role: Reprogrammable state machine executing time-critical sequences with guaranteed 125 MHz register-to-register timing and power-down retention. Use Value: Enables FDA-regulated field updates via JTAG without hardware modification - maintains traceable logic versioning via 16-bit User Signature field.

Industrial PLC I/O Expansion

Legacy System TTL Replacement

Use Scenario: Adding isolated digital input/output channels to a programmable logic controller chassis with space and power constraints.

IC Role / Device Role / Timing Role: Configurable logic engine implementing debounce, edge detection, and protocol translation between field sensors and backplane bus.

Use Value: Replaces 8–12 discrete 74HCxx chips with single ATF1502ASL-25AI44, reducing BOM count, board area, and assembly cost while enabling post-deployment logic updates.

Use Scenario: Modernizing aging avionics test equipment requiring direct compatibility with obsolete 74LS154 decoders and 74LS175 registers.

IC Role / Device Role / Timing Role: Pin-compatible logic emulation layer translating legacy control signals into FPGA-friendly formats with deterministic 7.5 ns propagation.

Use Value: Eliminates obsolescence risk without redesigning PCB layout - leverages existing 44-pin footprint and 5V supply rail while supporting JTAG verification.

PCI Bus Interface Logic

Field-Upgradeable Control Sequencer

Use Scenario: Implementing address decoding, bus arbitration, and configuration space mapping in a PCI add-in card for industrial data acquisition.

IC Role / Device Role / Timing Role: PCI-compliant logic block driving IDSEL, FRAME#, IRDY#, and TRDY# with ±44 mA drive strength and <5 ns skew.

Use Value: Meets PCI Local Bus Rev. 2.2 electrical specs without external buffers - simplifies compliance testing and reduces component count in high-reliability applications.

Use Scenario: Managing boot sequence, sensor calibration, and safety interlock logic in medical diagnostic hardware where firmware patches must update control flow.

IC Role / Device Role / Timing Role: Reprogrammable state machine executing time-critical sequences with guaranteed 125 MHz register-to-register timing and power-down retention.

Use Value: Enables FDA-regulated field updates via JTAG without hardware modification - maintains traceable logic versioning via 16-bit User Signature field.

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-10VQ44C	64 macrocells, 3.3V core, 10 ns tPD, no built-in PCI drive or ITD circuits	Better suited for low-voltage, higher-density logic; lacks native 5V PCI compliance and automatic 10 µA standby	Select when migrating to 3.3V systems or requiring >32 macrocells; requires level-shifting for 5V buses.
ATF1504ASL-25AI44	64 macrocells, identical 44-pin TQFP, same "L" low-power features and ITD, 10 ns max tPD	Direct scalability path - doubles logic capacity while retaining pinout, power profile, and JTAG flow	Choose for designs anticipating future logic growth without changing PCB or thermal design.

Compared with XCR3064XL-10VQ44C and ATF1504ASL-25AI44, the ATF1502ASL-25AI44 uniquely balances 5V PCI compliance, sub-10 µA standby, and JTAG-enabled field updates in a compact 44-pin form factor - making it optimal for cost-sensitive, power-constrained industrial control upgrades where 32 macrocells suffice.

Availability

ATF1502ASL-25AI44 is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, legacy TTL replacement, and PCI bus interface logic requiring stable component supply, long-term lifecycle assurance, and consistent 5V logic compatibility.

Supply support for ATF1502ASL-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 continues to manufacture, support, and qualify legacy Atmel PLD products including the ATF1502ASL series for industrial and aerospace applications.

The ATF1502ASL family was designed specifically for reprogrammable logic replacement of obsolete TTL/SSI/MSI devices and PCI-compliant interface control in harsh-environment embedded systems requiring zero-maintenance standby operation.

FAQ

What is the operating temperature range for the ATF1502ASL-25AI44?

The ATF1502ASL-25AI44 is rated for industrial temperature operation from –40°C to +85°C. This specification is confirmed in the Absolute Maximum Ratings and DC Operating Conditions tables of the official datasheet (Rev. 0995J–PLD–09/02), and applies to the "I" suffix variant denoted in the full part number ATF1502ASL-25AI44.

Does the ATF1502ASL-25AI44 support in-system programming (ISP) without removing it from the circuit board?

Yes, the ATF1502ASL-25AI44 supports full in-system programming via its IEEE 1149.1-compliant 4-pin JTAG interface (TCK, TMS, TDI, TDO). ISP allows configuration and reprogramming while soldered on the target PCB, eliminating socket handling and enabling field updates - a core feature explicitly documented for the ATF1502ASL-25AI44 in the "ISP Programming Protection" and "JTAG-BST/ISP Overview" sections.

What power-saving modes does the ATF1502ASL-25AI44 offer, and how do they differ?

The ATF1502ASL-25AI44 offers three distinct low-power modes: (1) Automatic 10 µA standby ("L" version only), (2) Pin-controlled power-down (<1 mA via PD1/PD2), and (3) Per-macrocell reduced-power bit. These are verified in the "Advanced Power Management Features" and "Power-down Mode" sections of the datasheet, with ICC1 = 10 µA (standby), ICC2 = 1 mA (power-down), and ICC3 = 35 mA (reduced-power mode).

Is the ATF1502ASL-25AI44 compatible with PCI Local Bus specifications?

Yes, the ATF1502ASL-25AI44 is explicitly PCI-compliant per PCI Local Bus Specification Rev. 2.2. Its output drive strength (IOH = –44 mA, IOL = +95 mA), AC timing (tSLEWR/tSLEWF = 1–5 V/ns), and DC parameters (VOH ≥ 2.4 V, VOL ≤ 0.55 V at 3 mA) meet PCI requirements - confirmed in the "PCI Compliance" and "PCI DC/AC Characteristics" sections of the datasheet.

Can unused I/O pins on the ATF1502ASL-25AI44 be configured to prevent floating states?

Yes, the ATF1502ASL-25AI44 includes a programmable "pin-keeper" option for all input and I/O pins. When enabled, it holds the last driven logic state (high or low) after release, eliminating floating inputs, reducing system noise, and removing the need for external pull-up resistors - a feature detailed in the "Programmable Pin-keeper Option" section and verified in the DC characteristics table (IIH/IIL leakage < ±10 µA with keeper off).

ATF1502ASL-25AI44 Specifications

Product attributes: Attribute value

Manufacturer:: Microchip Technology

Series:: ATF15xx

Package/Case:: 44-TQFP

Packaging:: Tray

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:: 32

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-TQFP (10x10)

ATF1502ASL-25AI44 FAQ

1.How can I place an order for ATF1502ASL-25AI44 through Aetrix?

Please submit a Request for Quotation (RFQ) for ATF1502ASL-25AI44 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-25AI44 reliable?

The price and inventory of ATF1502ASL-25AI44 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ATF1502ASL-25AI44 is usually 5 days.

3.What payment methods are accepted for ATF1502ASL-25AI44?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ATF1502ASL-25AI44 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ATF1502ASL-25AI44?

ATF1502ASL-25AI44 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ATF1502ASL-25AI44 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-25AI44?

For technical support, including ATF1502ASL-25AI44 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ATF1502ASL-25AI44 requirements.

6.How does Aetrix verify that ATF1502ASL-25AI44 is sourced from the original manufacturer or authorized distributors?

All ATF1502ASL-25AI44 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-25AI44 meets industry standards.

7.What is the process for return or replacement of ATF1502ASL-25AI44?

All ATF1502ASL-25AI44 units undergo pre-shipment inspection (PSI). If there is an issue with ATF1502ASL-25AI44, 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-25AI44 part is unused and in its original packaging.

Return procedure for ATF1502ASL-25AI44:

1.Submit a request within 90 days.

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

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