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

Microchip Technology ATF1502ASL-25JU44

Name: ATF1502ASL-25JU44
Brand: Microchip Technology
SKU: ATF1502ASL-25JU44
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: ATF1502ASL-25JU44

Manufacturer:: Microchip Technology

Category:: CPLDs (Complex Programmable Logic Devices)

Package:: 44-LCC (J-Lead)

Datasheet:: ATF1502ASL-25JU44.pdf

Description:: IC CPLD 32MC 25NS 44PLCC

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Product details

Overview

ATF1502ASL-25JU44 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 pin-to-pin delay, and 125 MHz registered operation - used for logic consolidation in industrial control, legacy interface bridging, and FPGA configuration support.

For engineers reviewing the ATF1502ASL-25JU44 datasheet, ATF1502ASL-25JU44 pinout, ATF1502ASL-25JU44 application, or ATF1502ASL-25JU44 equivalent, key selection considerations include its ISP-enabled JTAG programming, programmable slew rate and open-collector outputs, input transition detection (ITD), power-down mode via PD1/PD2 pins, and PCI-compliant 5V I/O drive capability.

Technical Context

The ATF1502ASL-25JU44 implements a two-block CPLD architecture with 32 macrocells distributed across Logic Blocks A and B, each fed by a shared global bus carrying up to 36 inputs plus 32 buried feedback signals. Its switch matrix selects up to 40 signals per block for routing to macrocell logic arrays.

Each macrocell supports D/T-latch configurable flip-flops, individual register clock enable, asynchronous clear/preset (via GCLEAR or product term), combinatorial or registered output with buried feedback, and programmable output enable sourced from GOE[0:5] or I/O pins. Three global clock pins (GCLK1–GCLK3) feed ITD circuits and support fast registered input paths.

Key Specifications

Parameter	Value and Actual Design Meaning
Logic Density	32 macrocells with 5 base + up to 35 expandable product terms per macrocell - enables implementation of medium-complexity state machines and glue logic without external TTL/SSI.
Timing Performance	7.5 ns max pin-to-pin delay (–25 speed grade); 125 MHz max registered clock frequency - suitable for 5V bus interfaces operating up to 8 MHz with timing margin.
Power Management	10 μA standby current (L-version); pin-controlled 1 mA power-down mode; per-macrocell reduced-power bit - reduces dynamic and static power in idle or partial-use configurations.
I/O Capability	32 bi-directional I/Os + 4 dedicated inputs; programmable slew rate, open-collector option, pin-keeper circuitry - eliminates need for external pull-ups and supports mixed-slew signaling on same device.
Standards Compliance	IEEE 1149.1a JTAG boundary-scan; PCI-compliant 5V I/O (3 mA sink / 2 mA source); RoHS-compliant green packaging - validated for testability and plug-in compatibility in legacy PCI systems.
Non-volatile Memory	EEPROM-based configuration storage; 10,000 program/erase cycles; 20-year data retention; security fuse protection - enables field reprogramming without battery backup or external configuration PROM.

Pinout & Package

ATF1502ASL-25JU44 is housed in a 44-lead Thin Quad Flat Package (TQFP), 10 mm × 10 mm, 0.8 mm pitch, lead-free and RoHS compliant. Pin functions are defined per the official Atmel pinout diagram for 44-lead TQFP top view.

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	Configurable as bidirectional I/O (32 pins) or dedicated input (4 pins: GCLR, OE1, GCLK1, GCLK3); all support pin-keeper, slew control, and open-collector mode.
44	GCLK2 / OE2 / Input	Multi-function pin supporting global clock 2, output enable 2, or general-purpose input - selectable per design compiler mapping.
23, 24, 25, 26	JTAG Interface (TDI, TMS, TCK, TDO)	IEEE 1149.1-compliant boundary-scan and ISP programming interface; TMS/TDI support internal pull-up option when JTAG is enabled.
33, 34	PD1 / PD2	Power-down control inputs - drive high to enter sub-1 mA power-down mode; latches internal state and holds outputs while blocking all other inputs.
11, 22, 31, 40	VCC / GND	Four VCC (pins 11, 22, 31, 40) and four GND (pins 4, 13, 27, 43) pins - provide low-inductance power distribution and noise reduction for 5V operation.

Key Features

Feature	Design Value
In-System Programmability (ISP)	Full JTAG-based reprogramming in-circuit using standard IEEE 1149.1 protocol - eliminates socketing, enables firmware updates and design iteration without board removal.
Input Transition Detection (ITD)	Dedicated edge-detection circuitry on global clocks, inputs, and I/Os - allows asynchronous event capture (e.g., interrupt generation) without consuming macrocell logic resources.
Programmable Pin-keeper	On-chip weak keeper on all inputs and I/Os - prevents floating states and associated shoot-through current, eliminating external pull-up resistors and reducing BOM count.
PCI-Compliant I/O	Guaranteed 3 mA sink / 2 mA source drive at 5V with <0.55 V VOL - meets PCI Local Bus Specification v2.2 electrical requirements for direct connection to PCI slots.
Power-up Reset with Hysteresis	Configurable small/large hysteresis reset threshold (VRST) - ensures reliable initialization of all registers during power ramp, critical for deterministic state machine startup.

Applications

Industrial PLC I/O Expansion	Legacy Bus Interface Bridging
Use Scenario: Adding isolated digital I/O channels to a programmable logic controller with space-constrained PCB layout and no spare microcontroller GPIOs. IC Role / Device Role / Timing Role: Glue logic CPLD implementing parallel input sampling, debounced output latching, and status register readback via 8-bit data bus. Use Value: Replaces 8+ discrete TTL chips; leverages 7.5 ns propagation delay for synchronous sampling at 10 MHz bus clock; uses pin-keeper to hold outputs during reset.	Use Scenario: Translating between ISA-bus peripherals and modern microcontrollers lacking native ISA timing and voltage levels. IC Role / Device Role / Timing Role: Timing generator and level translator managing ISA address strobes, I/O write pulses, and 5V-tolerant data bus handshaking. Use Value: Uses three global clocks (GCLK1–GCLK3) to generate precise 0WS/1WS timing windows; PCI-compliant I/O drives ISA bus directly without level shifters.
FPGA Configuration Support	Automotive Diagnostic Interface
Use Scenario: Managing configuration bitstream loading and status monitoring for Xilinx Spartan or Altera MAX II FPGAs in embedded systems. IC Role / Device Role / Timing Role: Serial-to-parallel converter and CRC checker for SPI-configured FPGAs; provides DONE, INIT_B, and CCLK control signals. Use Value: Implements error-checking logic in macrocells; uses programmable slew rate to reduce EMI on configuration lines; retains configuration state during brownout via EEPROM.	Use Scenario: Implementing ISO 9141-2 or K-Line diagnostic protocol logic in engine control units where space and thermal budget limit FPGA use. IC Role / Device Role / Timing Role: UART-like state machine with precise 10.4 kbps bit timing, line driver control, and short-circuit protection logic. Use Value: ITD circuits detect K-line edges for asynchronous wake-up; power-down mode reduces quiescent current to <10 μA during sleep; operates across –40°C to +85°C.

Industrial PLC I/O Expansion

Legacy Bus Interface Bridging

Use Scenario: Adding isolated digital I/O channels to a programmable logic controller with space-constrained PCB layout and no spare microcontroller GPIOs.

IC Role / Device Role / Timing Role: Glue logic CPLD implementing parallel input sampling, debounced output latching, and status register readback via 8-bit data bus.

Use Value: Replaces 8+ discrete TTL chips; leverages 7.5 ns propagation delay for synchronous sampling at 10 MHz bus clock; uses pin-keeper to hold outputs during reset.

Use Scenario: Translating between ISA-bus peripherals and modern microcontrollers lacking native ISA timing and voltage levels.

IC Role / Device Role / Timing Role: Timing generator and level translator managing ISA address strobes, I/O write pulses, and 5V-tolerant data bus handshaking.

Use Value: Uses three global clocks (GCLK1–GCLK3) to generate precise 0WS/1WS timing windows; PCI-compliant I/O drives ISA bus directly without level shifters.

FPGA Configuration Support

Automotive Diagnostic Interface

Use Scenario: Managing configuration bitstream loading and status monitoring for Xilinx Spartan or Altera MAX II FPGAs in embedded systems.

IC Role / Device Role / Timing Role: Serial-to-parallel converter and CRC checker for SPI-configured FPGAs; provides DONE, INIT_B, and CCLK control signals.

Use Value: Implements error-checking logic in macrocells; uses programmable slew rate to reduce EMI on configuration lines; retains configuration state during brownout via EEPROM.

Use Scenario: Implementing ISO 9141-2 or K-Line diagnostic protocol logic in engine control units where space and thermal budget limit FPGA use.

IC Role / Device Role / Timing Role: UART-like state machine with precise 10.4 kbps bit timing, line driver control, and short-circuit protection logic.

Use Value: ITD circuits detect K-line edges for asynchronous wake-up; power-down mode reduces quiescent current to <10 μA during sleep; operates across –40°C to +85°C.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
ATF1502AS-25JU44	Same logic architecture and pinout, but lacks "L"-version low-power features: no 10 μA standby, no PD1/PD2 power-down, no ITD circuits.	Suitable only for non-battery-powered, continuously active systems where power optimization is not required.	Select ATF1502ASL-25JU44 when ultra-low standby current, power-down control, or input transition detection is needed.
XCR3064XL-10VQ44C	64 macrocells, 3.3V core, 5V-tolerant I/O, 10 ns tPD; uses Flash-based nonvolatile memory instead of EEPROM.	Better suited for higher-density designs requiring >32 macrocells or lower core voltage; Flash offers faster erase/program but fewer endurance cycles (1k vs. 10k).	Choose XCR3064XL-10VQ44C when scaling logic complexity beyond 32 macrocells or migrating toward 3.3V system architecture.

Compared with ATF1502AS-25JU44, the ATF1502ASL-25JU44 delivers verified 10 μA standby and hardware-accelerated edge detection - critical for energy-sensitive or event-driven systems; versus XCR3064XL-10VQ44C, it trades density and voltage flexibility for EEPROM endurance, 5V-native I/O robustness, and simpler migration from legacy 5V PLDs.

Availability

ATF1502ASL-25JU44 is available at Aetrix Electronics and suitable for industrial control, automotive diagnostics, and legacy bus interface applications requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for ATF1502ASL-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 ATF1502AS(L) CPLD family, including datasheets, design tools, and programming hardware.

The ATF1502AS(L) series was designed as a drop-in replacement for obsolete 22V10 and 20V8 PALs and GALs, targeting cost-sensitive, low-power, and field-upgradable logic consolidation in 5V systems.

FAQ

What is the maximum operating frequency of the ATF1502ASL-25JU44?

The ATF1502ASL-25JU44 supports a maximum registered clock frequency of 125 MHz under industrial temperature conditions (–40°C to +85°C) and 5V supply, as specified in Table 11-4 of the datasheet. This applies to global clock inputs (GCLK1–GCLK3) driving registered macrocell outputs; combinatorial paths achieve up to 166.7 MHz in the –7 speed grade, though ATF1502ASL-25JU44 is rated for 125 MHz operation.

Does the ATF1502ASL-25JU44 support in-system programming (ISP)?

Yes, the ATF1502ASL-25JU44 fully supports IEEE 1149.1-compliant in-system programming via its dedicated JTAG interface (pins 23–26: TDI, TMS, TCK, TDO). Programming can be performed without removing the device from the PCB using standard SVF files, Atmel-provided tools, or third-party JTAG programmers - a core feature confirmed in Section 9 and Figure 12-1 of the datasheet.

What is the purpose of the PD1 and PD2 pins on the ATF1502ASL-25JU44?

PD1 (pin 33) and PD2 (pin 34) are dedicated power-down control inputs for the ATF1502ASL-25JU44. When either pin is driven high, the device enters a sub-1 mA power-down mode, latching all internal logic states and outputs while blocking input transitions - enabling ultra-low-power sleep modes in battery-operated or energy-conscious systems, as detailed in Section 11.9.

Is the ATF1502ASL-25JU44 compatible with PCI bus signaling?

Yes, the ATF1502ASL-25JU44 is explicitly PCI-compliant per Section 14 of the datasheet. It meets PCI Local Bus Specification v2.2 DC requirements: 3 mA sink / 2 mA source drive strength, 0.55 V max VOL at 3 mA, and 2.4 V min VOH at –2 mA - allowing direct connection to 5V PCI slots without external buffers or level shifters.

How does the programmable pin-keeper function work on the ATF1502ASL-25JU44?

The ATF1502ASL-25JU44 includes a programmable on-chip pin-keeper circuit on all input and I/O pins. When enabled, it maintains the last driven logic state (high or low) after the driving signal is removed - preventing floating inputs that cause shoot-through current and noise. This eliminates the need for external pull-up resistors, as described in Section 4 and Figure 4-1/4-2 of the datasheet.

ATF1502ASL-25JU44 Specifications

Product attributes: Attribute value

Manufacturer:: Microchip Technology

Series:: ATF15xx

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

Packaging:: Tube

Product Status:: Active

Programmable:: 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-PLCC (16.6x16.6)

ATF1502ASL-25JU44 FAQ

1.How can I place an order for ATF1502ASL-25JU44 through Aetrix?

Please submit a Request for Quotation (RFQ) for ATF1502ASL-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 ATF1502ASL-25JU44 reliable?

The price and inventory of ATF1502ASL-25JU44 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ATF1502ASL-25JU44 is usually 5 days.

3.What payment methods are accepted for ATF1502ASL-25JU44?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ATF1502ASL-25JU44 transactions.

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ATF1502ASL-25JU44 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ATF1502ASL-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 ATF1502ASL-25JU44?

For technical support, including ATF1502ASL-25JU44 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ATF1502ASL-25JU44 requirements.

6.How does Aetrix verify that ATF1502ASL-25JU44 is sourced from the original manufacturer or authorized distributors?

All ATF1502ASL-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 ATF1502ASL-25JU44 meets industry standards.

7.What is the process for return or replacement of ATF1502ASL-25JU44?

All ATF1502ASL-25JU44 units undergo pre-shipment inspection (PSI). If there is an issue with ATF1502ASL-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 ATF1502ASL-25JU44 part is unused and in its original packaging.

Return procedure for ATF1502ASL-25JU44:

1.Submit a request within 90 days.

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

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