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

Microchip Technology ATF1502AS-7AC44

Name: ATF1502AS-7AC44
Brand: Microchip Technology
SKU: ATF1502AS-7AC44
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: ATF1502AS-7AC44

Manufacturer:: Microchip Technology

Category:: CPLDs (Complex Programmable Logic Devices)

Package:: 44-TQFP

Datasheet:: ATF1502AS-7AC44.pdf

Description:: IC CPLD 32MC 7.5NS 44TQFP

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Product details

Overview

ATF1502AS-7AC44 from Atmel is a high-performance, 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 integrates legacy TTL/SSI/MSI logic and supports PCI-compliant 5V I/O in industrial control and embedded system glue logic.

For engineers reviewing the ATF1502AS-7AC44 datasheet, ATF1502AS-7AC44 pinout, ATF1502AS-7AC44 application, or ATF1502AS-7AC44 equivalent, key selection criteria include its JTAG-based in-system programmability, programmable slew rate and open-collector outputs, three global clock inputs, input transition detection circuits, and pin-controlled power-down mode with sub-1 mA standby current.

Technical Context

The ATF1502AS-7AC44 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 registered feedback and combinatorial output with registered feedback within the same cell.

It features a global bus carrying all 32 macrocell feedback signals plus all I/O and dedicated input pins, feeding into switch matrices that select up to 40 signals per logic block. Four regional foldback buses support high-fan-in sum-term logic with up to nine product terms per region and low-delay cascade chains supporting up to 40-product-term fan-in.

Key Specifications

Parameter	Value and Actual Design Meaning
Macrocells	32 logic macrocells with individual register, output enable, and product term control.
Product Terms	5 per macrocell, expandable to 40 via cascade logic for complex sum-of-products implementation.
Max Pin-to-pin Delay	7.5 ns - enables synchronous logic operation at up to 125 MHz registered frequency.
Global Clock Pins	Three dedicated GCLK[1–3] inputs supporting independent clock domains and ITD circuitry.
I/O Count	Up to 32 bi-directional I/Os + 4 dedicated inputs (GCLR, OE1, OE2, GCLKx) depending on configuration.
Power Management	Pin-controlled 1 mA standby mode and automatic 10 µA standby (L-version); reduced-power bit per macrocell.
JTAG Compliance	Fully IEEE Std. 1149.1-1990/1149.1a-1993 compliant boundary-scan and ISP programming interface.
PCI Support	5V-tolerant outputs meeting PCI DC/AC electrical specs including ±44 mA AC drive and <0.55 V VOL at 3 mA.

Pinout & Package

ATF1502AS-7AC44 is housed in a 44-lead Thin Quad Flat Package (TQFP) with 0.8 mm lead pitch, JEDEC MS-026 standard footprint, and exposed thermal pad (non-electrical). Pin 1 marked by dot or bevelled corner; top view shown in datasheet Rev. 0995J–PLD–09/02.

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, global control (GCLR/OE1/OE2/GCLK), or fast input with ITD; pin-keeper option prevents floating.
44	TCK / I/O	JTAG test clock input; also usable as general-purpose I/O when JTAG disabled.
43	TDO / I/O	JTAG test data output; tri-state during normal operation unless configured as I/O.
42	TMS / I/O	JTAG test mode select; pull-up option available; functions as I/O if JTAG not enabled.
41	TDI / I/O	JTAG test data input; pull-up option available; serves as I/O when JTAG unused.
20, 21	PD1 / PD2	Pin-controlled power-down inputs - high = enter sub-5 mA standby; disables logic but holds outputs and internal state.
11, 12, 13	GCLK1 / GCLK2 / GCLK3	Dedicated global clock inputs with integrated Input Transition Detection (ITD) for asynchronous edge capture.
10	GCLR / I	Global asynchronous clear input - resets all registers; can be OR'd with product term for conditional reset.
9, 8	OE1 / OE2	Global output enable pins - control tri-state behavior across multiple macrocells; true/complement selectable per I/O.

Key Features

Feature	Design Value
In-System Programmability (ISP)	IEEE 1149.1 JTAG interface enables field reprogramming without device removal; four reserved pins (TCK/TDO/TMS/TDI) retain full macrocell functionality for logic use.
Programmable Slew Rate	Per-output control allows slow switching (default) or fast switching - reduces EMI and crosstalk on noise-sensitive PCB traces.
Input Transition Detection (ITD)	Hardware edge-detection on GCLK, dedicated inputs, and I/O pins enables reliable asynchronous event capture without external logic or CPU polling.
Security Fuse & User Signature	One-time programmable security fuse blocks readback of configuration; 16-bit user-accessible signature stores project ID, revision, or date regardless of fuse state.
Power-up Reset with Hysteresis	Configurable small/large hysteresis ensures deterministic register initialization at power-on; large hysteresis reduces ICC by several hundred µA.
PCI-Compliant Output Drivers	5V-tolerant outputs meet PCI specification for sink/source current (±44 mA AC, 3 mA/6 mA DC), skew, and voltage thresholds - no external buffers required.

Applications

Industrial PLC I/O Expansion	Legacy System Interface Bridge
Use Scenario: Replacing discrete TTL logic in programmable logic controller backplanes to manage sensor inputs, relay outputs, and protocol translation between RS-485 and local bus. IC Role / Device Role / Timing Role: Glue logic CPLD providing synchronized sampling, debounce filtering, and level-shifted 5V I/O interfacing with microcontroller peripherals. Use Value: Eliminates 12+ discrete ICs while maintaining deterministic 7.5 ns propagation delay and supporting hot-swap-compatible power-down via PD1/PD2 pins.	Use Scenario: Interfacing vintage ISA-bus peripherals (e.g., parallel port cards, stepper motor controllers) to modern embedded hosts using FPGA or ARM SoC with limited native 5V I/O. IC Role / Device Role / Timing Role: Protocol-aware logic translator implementing address decoding, strobe generation, and handshaking with precise setup/hold timing (tSU = 3 ns, tH = 2 ns). Use Value: Enables drop-in replacement of obsolete PAL/GAL devices using industry-standard ABEL/VHDL toolchains and JTAG in-circuit reconfiguration.
PCI Add-in Card Control Logic	Automated Test Equipment (ATE) Pattern Generator
Use Scenario: Managing configuration, status reporting, and interrupt routing on PCI add-in cards such as data acquisition modules or digital I/O adapters. IC Role / Device Role / Timing Role: PCI-compliant CPLD handling IDSEL decoding, BAR mapping, and command decode for memory-mapped I/O space. Use Value: Meets PCI electrical specs (VOL ≤ 0.55 V at 3 mA, IOH ≥ –44 mA) without external drivers, reducing BOM count and board area.	Use Scenario: Generating high-speed, repeatable stimulus waveforms for semiconductor wafer testing where precise timing alignment and glitch-free transitions are critical. IC Role / Device Role / Timing Role: Deterministic pattern sequencer using registered outputs clocked at 125 MHz with sub-5 ns clock-to-output delay (tCOP = 4.5 ns). Use Value: Achieves 125 MHz synchronous operation with guaranteed hold time (tH = 0 ns) and supports fast input sampling (tFSU = 3 ns) for real-time trigger response.

Industrial PLC I/O Expansion

Legacy System Interface Bridge

Use Scenario: Replacing discrete TTL logic in programmable logic controller backplanes to manage sensor inputs, relay outputs, and protocol translation between RS-485 and local bus.

IC Role / Device Role / Timing Role: Glue logic CPLD providing synchronized sampling, debounce filtering, and level-shifted 5V I/O interfacing with microcontroller peripherals.

Use Value: Eliminates 12+ discrete ICs while maintaining deterministic 7.5 ns propagation delay and supporting hot-swap-compatible power-down via PD1/PD2 pins.

Use Scenario: Interfacing vintage ISA-bus peripherals (e.g., parallel port cards, stepper motor controllers) to modern embedded hosts using FPGA or ARM SoC with limited native 5V I/O.

IC Role / Device Role / Timing Role: Protocol-aware logic translator implementing address decoding, strobe generation, and handshaking with precise setup/hold timing (tSU = 3 ns, tH = 2 ns).

Use Value: Enables drop-in replacement of obsolete PAL/GAL devices using industry-standard ABEL/VHDL toolchains and JTAG in-circuit reconfiguration.

PCI Add-in Card Control Logic

Automated Test Equipment (ATE) Pattern Generator

Use Scenario: Managing configuration, status reporting, and interrupt routing on PCI add-in cards such as data acquisition modules or digital I/O adapters.

IC Role / Device Role / Timing Role: PCI-compliant CPLD handling IDSEL decoding, BAR mapping, and command decode for memory-mapped I/O space.

Use Value: Meets PCI electrical specs (VOL ≤ 0.55 V at 3 mA, IOH ≥ –44 mA) without external drivers, reducing BOM count and board area.

Use Scenario: Generating high-speed, repeatable stimulus waveforms for semiconductor wafer testing where precise timing alignment and glitch-free transitions are critical.

IC Role / Device Role / Timing Role: Deterministic pattern sequencer using registered outputs clocked at 125 MHz with sub-5 ns clock-to-output delay (tCOP = 4.5 ns).

Use Value: Achieves 125 MHz synchronous operation with guaranteed hold time (tH = 0 ns) and supports fast input sampling (tFSU = 3 ns) for real-time trigger response.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
ATF1502AS-10AC44	Slower speed grade: 10 ns max pin-to-pin delay, 100 MHz max registered frequency vs. 7.5 ns / 125 MHz.	Suitable for cost-sensitive designs with relaxed timing margins; identical pinout and feature set.	Select when design timing slack exceeds 2.5 ns and power budget permits higher ICC1 (75 mA vs. 60 mA typical).
ATF1502ASL-7AC44	Low-power "L" variant: 10 µA automatic standby vs. 1 mA pin-controlled standby; same speed grade and pinout.	Better suited for battery-backed or thermally constrained systems requiring ultra-low quiescent current during idle periods.	Choose when standby current is critical and PD1/PD2 pin control is unnecessary; note reduced ICC3 in reduced-power mode.

Compared with ATF1502AS-10AC44 and ATF1502ASL-7AC44, the ATF1502AS-7AC44 delivers the highest registered frequency (125 MHz) and lowest propagation delay (7.5 ns) among the AS family, while retaining full JTAG ISP, PCI compliance, and macrocell-level power control - making it optimal for performance-critical industrial and test equipment designs.

Availability

ATF1502AS-7AC44 is available at Aetrix Electronics and suitable for industrial automation, legacy system integration, PCI add-in card development, and automated test equipment requiring stable component supply and long-term lifecycle support.

Supply support for ATF1502AS-7AC44 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

Atmel Corporation (now part of Microchip Technology) is a fabless semiconductor company specializing in non-volatile memory, microcontrollers, and programmable logic devices for industrial, automotive, and communications markets.

The ATF1502AS series was designed as a high-density, EEPROM-based CPLD targeting replacement of TTL/SSI/MSI logic and legacy PLDs in 5V systems requiring in-system programmability, PCI compatibility, and deterministic timing.

FAQ

What is the maximum operating frequency of the ATF1502AS-7AC44?

The ATF1502AS-7AC44 supports registered operation up to 125 MHz, verified by its 7.5 ns maximum pin-to-pin delay and 8 ns minimum global clock period (tCNT). This frequency applies to synchronous logic paths using global clocks GCLK1–GCLK3; array-clock paths support the same 125 MHz maximum. The device achieves this performance while maintaining full JTAG boundary-scan testability and PCI-compliant I/O drive strength.

Does the ATF1502AS-7AC44 support in-system programming (ISP)?

Yes, the ATF1502AS-7AC44 fully supports IEEE Std. 1149.1 JTAG-based in-system programming. Its four dedicated JTAG pins (TCK, TDO, TMS, TDI) allow configuration without removing the device from the PCB. Even when used for ISP, the associated macrocells retain full logic functionality - enabling simultaneous use of JTAG resources and user-defined logic. Serial Vector Format (SVF) files are supported for ATE integration.

What power-saving modes does the ATF1502AS-7AC44 offer?

The ATF1502AS-7AC44 provides three distinct power-saving mechanisms: (1) pin-controlled 1 mA standby via PD1/PD2 inputs, (2) per-macrocell reduced-power bit to disable unused logic, and (3) programmable output slew rate to minimize dynamic switching current. Unlike the "L" version, it does not feature automatic 10 µA standby, but retains full ITD and PCI drive capability in all low-power states.

Is the ATF1502AS-7AC44 compatible with PCI bus specifications?

Yes, the ATF1502AS-7AC44 meets Peripheral Component Interconnect (PCI) electrical requirements for 5V signaling, including output low voltage ≤ 0.55 V at 3 mA sink current, output high voltage ≥ 2.4 V at 4 mA source current, and AC drive capability of –44 mA (high) and +95 mA (low). Its low output-to-output skew and programmable high-drive mode eliminate need for external buffers in PCI add-in card designs.

How many I/O pins does the ATF1502AS-7AC44 have, and what are their capabilities?

The ATF1502AS-7AC44 provides up to 32 bi-directional I/O pins plus four dedicated input pins (GCLR, OE1, OE2, GCLKx), all configurable as inputs, outputs, or bidirectional ports. Each I/O supports programmable slew rate, open-collector output option, pin-keeper circuitry to prevent floating, and individual output enable control. Dedicated pins double as global control signals - e.g., GCLK1–GCLK3 serve both as clocks and ITD-enabled fast inputs.

ATF1502AS-7AC44 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:: 7.5 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-TQFP (10x10)

ATF1502AS-7AC44 FAQ

1.How can I place an order for ATF1502AS-7AC44 through Aetrix?

Please submit a Request for Quotation (RFQ) for ATF1502AS-7AC44 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 ATF1502AS-7AC44 reliable?

The price and inventory of ATF1502AS-7AC44 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ATF1502AS-7AC44 is usually 5 days.

3.What payment methods are accepted for ATF1502AS-7AC44?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ATF1502AS-7AC44 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ATF1502AS-7AC44?

ATF1502AS-7AC44 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ATF1502AS-7AC44 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 ATF1502AS-7AC44?

For technical support, including ATF1502AS-7AC44 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ATF1502AS-7AC44 requirements.

6.How does Aetrix verify that ATF1502AS-7AC44 is sourced from the original manufacturer or authorized distributors?

All ATF1502AS-7AC44 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 ATF1502AS-7AC44 meets industry standards.

7.What is the process for return or replacement of ATF1502AS-7AC44?

All ATF1502AS-7AC44 units undergo pre-shipment inspection (PSI). If there is an issue with ATF1502AS-7AC44, 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 ATF1502AS-7AC44 part is unused and in its original packaging.

Return procedure for ATF1502AS-7AC44:

1.Submit a request within 90 days.

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

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