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

Microchip Technology ATF1502AS-7AX44

Name: ATF1502AS-7AX44
Brand: Microchip Technology
SKU: ATF1502AS-7AX44
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: ATF1502AS-7AX44

Manufacturer:: Microchip Technology

Category:: CPLDs (Complex Programmable Logic Devices)

Package:: 44-TQFP

Datasheet:: ATF1502AS-7AX44.pdf

Description:: IC CPLD 32MC 7.5NS 44TQFP

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Product details

Overview

ATF1502AS-7AX44 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, 7.5ns maximum pin-to-pin delay, and registered operation up to 125MHz - used for logic integration in legacy industrial control, PCI-compliant interface bridging, and reconfigurable glue logic replacement.

For engineers reviewing the ATF1502AS-7AX44 datasheet, ATF1502AS-7AX44 pinout, ATF1502AS-7AX44 application, or ATF1502AS-7AX44 equivalent, this page delivers verified macrocell architecture details, JTAG ISP timing constraints, power-down mode behavior, PCI-compliant drive capability, and real-world I/O configuration trade-offs - all grounded in the official Atmel-0995L datasheet dated March 2014.

Technical Context

The ATF1502AS-7AX44 implements a two-block CPLD architecture with 32 macrocells distributed across Logic Block 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 logic block, enabling high-fan-in sum-of-products logic with cascade chains supporting up to 40 product terms per chain.

It features three global clock pins (GCLK1–GCLK3), programmable input transition detection (ITD) on clocks and I/Os, flexible flip-flop modes (D/T latch, JK, SR, flow-through), and dual-clock-enable support - one via global clock signal and another via dedicated product term - all configurable per macrocell without resource penalty.

Key Specifications

Parameter	Value and Actual Design Meaning
Macrocell Count	32 macrocells - provides sufficient logic density to replace multiple 74-series TTL/MSI devices or classic PLDs like PAL16R8 in board-level glue logic.
Product Terms per Macrocell	5 base product terms, expandable to 40 via cascade - enables efficient implementation of wide combinatorial functions such as address decoders or state machine next-state logic.
Max Pin-to-pin Delay	7.5 ns (–7 speed grade) - guarantees timing closure for 125 MHz registered operation in synchronous designs with tight setup/hold margins.
Global Clock Frequency	Up to 125 MHz - supports high-speed control logic in motor drives, data acquisition front-ends, and PCI local bus interfaces.
Power Supply	5.0 V ±5% - compatible with legacy 5V TTL/CMOS systems and PCI signaling requirements without level translation.
Standby Current	10 μA in "L" version standby - enables ultra-low-power sleep states in battery-backed industrial controllers or field-upgradable modules.
JTAG Compliance	IEEE Std. 1149.1-1990 and 1149.1a-1993 - ensures interoperability with standard boundary-scan test equipment and third-party ISP programming tools.

Pinout & Package

ATF1502AS-7AX44 is packaged in a 44-lead Thin Quad Flat Package (TQFP), RoHS-compliant, with 0.8 mm lead pitch and exposed thermal pad (not electrically connected). Pin assignments are identical to the 44-lead PLCC variant except for physical layout; no pin remapping occurs between packages.

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	32 bi-directional I/O pins + 4 dedicated inputs - supports mixed-mode logic: I/O pins serve as inputs, outputs, or bidirectional buses; dedicated pins function as GCLR, OE1, GCLK1–GCLK3, PD1/PD2, or ITD-enabled clocks.
44	VCC	Main 5V supply - powers core logic and I/O buffers; requires local 0.1 µF ceramic decoupling adjacent to pin.
20, 23, 35	GND	Three ground pins - placed to minimize ground bounce and ensure stable reference for high-speed switching I/Os.
3, 6, 10, 13	JTAG (TDI, TMS, TCK, TDO)	IEEE 1149.1 boundary-scan and ISP interface - reserved when JTAG is enabled; otherwise available as general-purpose I/O with pull-up option on TMS/TDI.
17, 26	PD1 / PD2	Pin-controlled power-down inputs - assert high to reduce ICC to <5 mA; disables all logic transitions while preserving register and output states.

Key Features

Feature	Design Value
In-System Programmability (ISP)	Enables field firmware updates and design iteration without device removal - uses standard 4-pin JTAG interface compliant with IEEE 1149.1, eliminating need for socketed programming fixtures.
Programmable Slew Rate	Per-output slew rate control reduces EMI and crosstalk in noise-sensitive applications - slow mode defaults to minimize ringing on long PCB traces; fast mode selectable per pin in design file.
Input Transition Detection (ITD)	Detects asynchronous edges on global clocks, inputs, and I/Os - allows low-power wake-up from standby without continuous polling, critical for event-driven industrial monitoring.
Security Fuse	One-time programmable fuse prevents unauthorized readback of configuration bitstream - protects proprietary logic design while leaving 16-bit User Signature accessible for version tracking.
PCI Compliance	Meets PCI Local Bus Specification DC drive requirements (VOH ≥2.4 V @ –2 mA, VOL ≤0.55 V @ 3–6 mA) - enables direct connection to PCI slots without external bus transceivers.

Applications

Industrial Control Logic	PCI Interface Bridging
Use Scenario: Replacing discrete TTL logic in PLC I/O modules to decode sensor status, generate enable strobes, and manage watchdog timers. IC Role / Device Role / Timing Role: Configurable glue logic with deterministic 7.5 ns propagation delay and 125 MHz registered throughput - synchronizes 24 VDC input sampling with microcontroller interrupt timing. Use Value: Eliminates 8–12 discrete ICs per module, reducing BOM cost by ~35% and board area by 40%, while enabling post-deployment logic updates via JTAG.	Use Scenario: Adapting legacy ISA-based motion controllers to PCI bus backplanes in CNC machines. IC Role / Device Role / Timing Role: PCI-compliant level translator and protocol sequencer - handles IDSEL decoding, parity generation, and address/data multiplexing with sub-10 ns skew. Use Value: Delivers full 33 MHz PCI timing compliance without external drivers, meeting VOL ≤0.55 V at 6 mA load while maintaining 5 V TTL compatibility.
Reconfigurable Power Sequencing	Legacy System Emulation
Use Scenario: Managing multi-rail power-up sequencing in telecom line cards where FPGA configuration must wait for auxiliary supplies. IC Role / Device Role / Timing Role: State-machine-based sequencer with programmable delays and fault latching - uses internal registers and ITD to monitor voltage monitor signals and assert reset holds. Use Value: Achieves 100% repeatable power-on behavior across temperature (-40°C to +85°C), replacing custom ASICs with field-upgradable logic.	Use Scenario: Emulating obsolete PAL/GAL devices in military avionics spares programs where original parts are unavailable. IC Role / Device Role / Timing Role: Pin-compatible functional replacement with identical macrocell count and product-term structure - supports JEDEC fuse map conversion via Atmel POF2JED toolchain. Use Value: Restores system functionality without PCB redesign; leverages same 44-pin footprint and 5 V supply, with 20-year data retention guarantee.

Industrial Control Logic

PCI Interface Bridging

Use Scenario: Replacing discrete TTL logic in PLC I/O modules to decode sensor status, generate enable strobes, and manage watchdog timers.

IC Role / Device Role / Timing Role: Configurable glue logic with deterministic 7.5 ns propagation delay and 125 MHz registered throughput - synchronizes 24 VDC input sampling with microcontroller interrupt timing.

Use Value: Eliminates 8–12 discrete ICs per module, reducing BOM cost by ~35% and board area by 40%, while enabling post-deployment logic updates via JTAG.

Use Scenario: Adapting legacy ISA-based motion controllers to PCI bus backplanes in CNC machines.

IC Role / Device Role / Timing Role: PCI-compliant level translator and protocol sequencer - handles IDSEL decoding, parity generation, and address/data multiplexing with sub-10 ns skew.

Use Value: Delivers full 33 MHz PCI timing compliance without external drivers, meeting VOL ≤0.55 V at 6 mA load while maintaining 5 V TTL compatibility.

Reconfigurable Power Sequencing

Legacy System Emulation

Use Scenario: Managing multi-rail power-up sequencing in telecom line cards where FPGA configuration must wait for auxiliary supplies.

IC Role / Device Role / Timing Role: State-machine-based sequencer with programmable delays and fault latching - uses internal registers and ITD to monitor voltage monitor signals and assert reset holds.

Use Value: Achieves 100% repeatable power-on behavior across temperature (-40°C to +85°C), replacing custom ASICs with field-upgradable logic.

Use Scenario: Emulating obsolete PAL/GAL devices in military avionics spares programs where original parts are unavailable.

IC Role / Device Role / Timing Role: Pin-compatible functional replacement with identical macrocell count and product-term structure - supports JEDEC fuse map conversion via Atmel POF2JED toolchain.

Use Value: Restores system functionality without PCB redesign; leverages same 44-pin footprint and 5 V supply, with 20-year data retention guarantee.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
ATF1502ASL-7AX44	Includes automatic 10 μA standby mode and Input Transition Detection (ITD); same pinout and macrocell architecture.	Better suited for battery-powered or thermally constrained environments requiring ultra-low quiescent current.	Select ATF1502ASL-7AX44 when standby current <15 μA is mandatory; otherwise ATF1502AS-7AX44 offers identical logic capacity at lower cost.
XCR3064XL-7VQ44C	Xilinx CoolRunner-II CPLD with 64 macrocells, 3.3 V core, 5 V tolerant I/O, and 7.5 ns propagation delay - higher density but different architecture and toolchain.	Requires migration to Xilinx WebPACK/XST flow; not pin-compatible; lacks native PCI drive strength without external resistors.	Choose XCR3064XL-7VQ44C only when additional macrocells or 3.3 V system integration is required - not a drop-in replacement.

Compared with ATF1502ASL-7AX44, the ATF1502AS-7AX44 omits automatic low-power standby but retains identical logic resources and timing; versus XCR3064XL-7VQ44C, it offers native 5 V PCI compliance and legacy toolchain support but half the macrocell count - making it optimal for cost-sensitive, 5 V-only rework projects.

Availability

ATF1502AS-7AX44 is available at Aetrix Electronics and suitable for industrial control logic, PCI interface bridging, reconfigurable power sequencing, and legacy system emulation requiring stable component supply across extended lifecycle demands.

Supply support for ATF1502AS-7AX44 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 legacy Atmel PLD products including the ATF1502AS family. The company specializes in microcontrollers, analog, and programmable logic solutions for industrial, automotive, and aerospace markets.

The ATF1502AS series was designed as a high-reliability, EEPROM-based CPLD platform targeting 5 V systems needing field-programmable glue logic with JTAG ISP, PCI compliance, and long-term data retention - especially in applications where FPGA complexity or cost is unjustified.

FAQ

What is the maximum operating frequency of the ATF1502AS-7AX44?

The ATF1502AS-7AX44 supports registered operation up to 125 MHz, as confirmed by its –7 speed grade AC characteristics table (fCNT = 125 MHz). This applies to global clock domains; array clock frequency is also rated at 125 MHz. Maximum system clock frequency depends on logic depth and routing - the 7.5 ns pin-to-pin delay enables robust timing closure in synchronous designs with moderate combinatorial paths. The ATF1502AS-7AX44 achieves this performance using Atmel's proven EEPROM-based CPLD architecture with optimized switch matrices and low-skew clock distribution.

Does the ATF1502AS-7AX44 support JTAG boundary-scan testing?

Yes, the ATF1502AS-7AX44 fully supports IEEE Std. 1149.1-1990 and 1149.1a-1993 boundary-scan testing. It includes dedicated Boundary-Scan Cells (BSCs) for all I/O and input pins, a compliant Test Access Port (TAP) controller, and supports all five standard JTAG instructions: SAMPLE/PRELOAD, EXTEST, BYPASS, IDCODE, and HIGHZ. The ATF1502AS-7AX44 also provides a BSDL file for integration with automated test equipment. JTAG functionality is programmable - if disabled, the TDI, TMS, TCK, and TDO pins become general-purpose I/Os.

Can the ATF1502AS-7AX44 be used in PCI-compliant designs?

Yes, the ATF1502AS-7AX44 meets key PCI Local Bus Specification DC requirements: VOH ≥2.4 V at –2 mA load and VOL ≤0.55 V at 3–6 mA sink current, with input leakage under ±70 μA and pin capacitance ≤10 pF. Its programmable high-drive mode delivers PCI-compliant signaling without external buffers. The ATF1502AS-7AX44 also supports IDSEL decoding and parity generation logic within its 32-macrocell fabric. These capabilities are validated in Table 14-1 and Figures 14-1/14-2 of the official Atmel-0995L datasheet.

What power management features does the ATF1502AS-7AX44 offer?

The ATF1502AS-7AX44 includes pin-controlled power-down mode (via PD1/PD2), programmable macrocell reduced-power bits, and individual output slew rate control. In power-down mode, ICC drops below 5 mA while preserving register and output states. Each macrocell can be configured for reduced-power operation, adding tRPA (10–15 ns) to relevant AC parameters. Outputs default to slow slew to minimize EMI; fast slew is selectable per pin. Unlike the "L" variant, the ATF1502AS-7AX44 does not include automatic 10 μA standby - that feature requires ATF1502ASL-7AX44.

Is the ATF1502AS-7AX44 pin-compatible with other 44-pin Atmel CPLDs?

The ATF1502AS-7AX44 shares the same 44-pin TQFP footprint and pinout with ATF1502ASL-7AX44 and ATF1502AS-10AX44, differing only in speed grade and standby behavior. It is not pin-compatible with higher-density devices like ATF1504AS or ATF22V10 derivatives due to differing macrocell counts and global signal allocations. All 44-pin ATF1502AS variants use identical JTAG, power, ground, and I/O pin assignments - enabling direct substitution where timing and power specs align. The ATF1502AS-7AX44 pinout is documented in Figure 1-1 of the Atmel-0995L datasheet.

ATF1502AS-7AX44 Specifications

Product attributes: Attribute value

Manufacturer:: Microchip Technology

Series:: ATF15xx

Package/Case:: 44-TQFP

Packaging:: Tray

Product Status:: Active

Programmable:: 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-7AX44 FAQ

1.How can I place an order for ATF1502AS-7AX44 through Aetrix?

Please submit a Request for Quotation (RFQ) for ATF1502AS-7AX44 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-7AX44 reliable?

The price and inventory of ATF1502AS-7AX44 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ATF1502AS-7AX44 is usually 5 days.

3.What payment methods are accepted for ATF1502AS-7AX44?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ATF1502AS-7AX44 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ATF1502AS-7AX44?

ATF1502AS-7AX44 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ATF1502AS-7AX44 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-7AX44?

For technical support, including ATF1502AS-7AX44 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ATF1502AS-7AX44 requirements.

6.How does Aetrix verify that ATF1502AS-7AX44 is sourced from the original manufacturer or authorized distributors?

All ATF1502AS-7AX44 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-7AX44 meets industry standards.

7.What is the process for return or replacement of ATF1502AS-7AX44?

All ATF1502AS-7AX44 units undergo pre-shipment inspection (PSI). If there is an issue with ATF1502AS-7AX44, 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-7AX44 part is unused and in its original packaging.

Return procedure for ATF1502AS-7AX44:

1.Submit a request within 90 days.

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

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