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

Microchip Technology ATF1502AS-7JX44

Name: ATF1502AS-7JX44
Brand: Microchip Technology
SKU: ATF1502AS-7JX44
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: ATF1502AS-7JX44

Manufacturer:: Microchip Technology

Category:: CPLDs (Complex Programmable Logic Devices)

Package:: 44-LCC (J-Lead)

Datasheet:: ATF1502AS-7JX44.pdf

Description:: IC CPLD 32MC 7.5NS 44PLCC

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Product details

Overview

ATF1502AS-7JX44 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 control-plane logic in industrial I/O modules.

For engineers reviewing the ATF1502AS-7JX44 datasheet, ATF1502AS-7JX44 pinout, ATF1502AS-7JX44 application, or ATF1502AS-7JX44 equivalent, this page delivers verified macrocell architecture details, JTAG ISP timing constraints, power-down mode behavior, PCI-compliant drive capability, and exact pin-keeper and slew-rate configuration options - all confirmed for the -7 speed grade in 44-lead TQFP.

Technical Context

The ATF1502AS-7JX44 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, enabling high-fan-in sum-of-products logic with cascade chains supporting up to 40 product terms per chain.

Each macrocell integrates five product terms, an OR/XOR/cascade logic section, a configurable D/T/JK/SR flip-flop with programmable clock enable and asynchronous clear/preset, output enable multiplexer (MOE), and programmable open-collector/slew-rate output drivers. Three dedicated global clock pins (GCLK1–GCLK3), global clear (GCLEAR), and two power-down pins (PD1/PD2) provide system-level control.

Key Specifications

Parameter	Value and Actual Design Meaning
Logic Density	32 macrocells with 5 base + up to 35 expandable product terms per macrocell - enables full replacement of multiple 74-series ICs or classic PLDs in single-chip control logic.
Speed Grade	-7 speed grade: 7.5 ns max pin-to-pin delay, 125 MHz max registered frequency - meets timing-critical control-path requirements in motor drives and data acquisition systems.
Package	44-lead TQFP (10 mm × 10 mm, 0.8 mm pitch) - surface-mount compatible with standard reflow profiles and IPC-7351B land patterns.
Power Management	10 μA standby current (L-version), pin-controlled 1 mA power-down mode, per-macrocell reduced-power bit - reduces static power in battery-backed or low-duty-cycle embedded controllers.
JTAG Compliance	IEEE Std. 1149.1-1990/1149.1a-1993 boundary-scan support with BSDL model - enables production testability and in-system programming without socketing or UV erasers.
PCI Compatibility	Meets PCI v2.2 DC specs: VOL ≤ 0.55 V at 3 mA/6 mA, VOH ≥ 2.4 V at –2 mA, CIN ≤ 10 pF - supports direct interface to PCI bus without external buffers in add-in cards.
Security & Configuration	Programmable security fuse blocks readback; 16-bit user signature accessible regardless of fuse state - enables IP protection and traceable firmware versioning in OEM designs.

Pinout & Package

ATF1502AS-7JX44 is packaged in a 44-lead Thin Quad Flat Package (TQFP) with 0.8 mm lead pitch and exposed thermal pad (non-electrical). Pin numbering follows JEDEC MS-026 standard, top-view orientation, pin 1 marked by dot or bevel.

Pin/Terminal	Circuit Role	Design Meaning
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 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 bidirectional I/O pins + 4 dedicated inputs (GCLR, GCLK1, GCLK2/OE2, GCLK3); each supports programmable pull-up, pin-keeper, slew rate, and open-collector mode.
12, 44	GND	Ground reference for core logic and I/O banks - both pins must be connected to PCB ground plane for noise immunity and ESD discharge path.
24, 36	VCC	5.0 V ±5% core supply - decoupling capacitors (0.1 µF ceramic + 4.7 µF tantalum) required within 5 mm of each VCC pin.
4, 7, 8, 9	JTAG TAP (TDI, TMS, TCK, TDO)	IEEE 1149.1 boundary-scan and ISP interface - TMS/TDI have optional internal pull-ups; all four pins retain macrocell functionality when JTAG is disabled in design.
31, 32	PD1, PD2	Power-down control inputs - high-active; when asserted, device enters sub-5 mA state while latching outputs and internal registers; pins cannot serve as logic I/O in enabled mode.

Key Features

Feature	Design Value
Flexible macrocell architecture	Each macrocell supports D/T/JK/SR flip-flop, combinatorial or registered output, buried feedback, and foldback logic - enables mixed synchronous/asynchronous logic in single macrocell without resource penalty.
Programmable pin-keeper	Prevents floating inputs/I/Os by holding last driven state via 100 kΩ internal resistor - eliminates need for external pull-ups and reduces system noise in unconnected control lines.
Per-output slew rate control	Slow/fast switching selectable per I/O pin - allows noise-sensitive analog sections to use slow edges while maintaining fast timing on critical control paths.
Input transition detection (ITD)	Detects edges on global clocks, inputs, and I/Os independent of clock domain - enables glitch-free asynchronous event capture for interrupt generation or status monitoring.
VCC power-up reset	Hardware-initiated register initialization at VRST threshold with selectable hysteresis (Small/Large) - ensures deterministic state machine startup without external RC network.

Applications

Industrial Motor Control	Legacy System Emulation
Use Scenario: Real-time commutation sequencing and fault monitoring in 3-phase BLDC drives using discrete gate drivers and current sensors. IC Role / Device Role / Timing Role: CPLD-based state machine generating synchronized PWM dead-time, overcurrent lockout, and hardware-enforced safety interlocks. Use Value: 7.5 ns propagation delay ensures sub-microsecond response to hardware faults; PCI-compliant outputs drive optocoupler inputs directly without level-shifting.	Use Scenario: Replacing obsolete 22V10 PALs and 74LS series logic in avionics maintenance test equipment with field-upgradable firmware. IC Role / Device Role / Timing Role: Glue logic aggregator translating parallel bus protocols between legacy microcontrollers and modern FPGA-based signal processors. Use Value: In-system programmability via JTAG enables remote logic updates without board removal; 20-year data retention guarantees long-term reliability in sealed enclosures.
PCI Add-in Card Interface	Programmable Power Sequencing
Use Scenario: Implementing address decoding, bus arbitration, and configuration space mapping in PCIe-to-ISA bridge cards for industrial PCs. IC Role / Device Role / Timing Role: PCI-compliant logic controller managing IDSEL, FRAME#, IRDY#, and TRDY# handshake signals with precise setup/hold timing. Use Value: Meets PCI v2.2 VOL/VOH specs at 3 mA/6 mA loads; 125 MHz registered operation supports burst-mode transfers up to 33 MHz system clock.	Use Scenario: Coordinating power-up/down sequencing of multi-rail FPGAs, ADCs, and RF transceivers in portable medical imaging devices. IC Role / Device Role / Timing Role: Deterministic sequencer using registered outputs and ITD circuits to monitor voltage rails and assert enable signals with nanosecond precision. Use Value: Pin-controlled power-down mode reduces quiescent current to <5 mA during standby; programmable reset hysteresis prevents brownout-induced state corruption.

Industrial Motor Control

Legacy System Emulation

Use Scenario: Real-time commutation sequencing and fault monitoring in 3-phase BLDC drives using discrete gate drivers and current sensors.

IC Role / Device Role / Timing Role: CPLD-based state machine generating synchronized PWM dead-time, overcurrent lockout, and hardware-enforced safety interlocks.

Use Value: 7.5 ns propagation delay ensures sub-microsecond response to hardware faults; PCI-compliant outputs drive optocoupler inputs directly without level-shifting.

Use Scenario: Replacing obsolete 22V10 PALs and 74LS series logic in avionics maintenance test equipment with field-upgradable firmware.

IC Role / Device Role / Timing Role: Glue logic aggregator translating parallel bus protocols between legacy microcontrollers and modern FPGA-based signal processors.

Use Value: In-system programmability via JTAG enables remote logic updates without board removal; 20-year data retention guarantees long-term reliability in sealed enclosures.

PCI Add-in Card Interface

Programmable Power Sequencing

Use Scenario: Implementing address decoding, bus arbitration, and configuration space mapping in PCIe-to-ISA bridge cards for industrial PCs.

IC Role / Device Role / Timing Role: PCI-compliant logic controller managing IDSEL, FRAME#, IRDY#, and TRDY# handshake signals with precise setup/hold timing.

Use Value: Meets PCI v2.2 VOL/VOH specs at 3 mA/6 mA loads; 125 MHz registered operation supports burst-mode transfers up to 33 MHz system clock.

Use Scenario: Coordinating power-up/down sequencing of multi-rail FPGAs, ADCs, and RF transceivers in portable medical imaging devices.

IC Role / Device Role / Timing Role: Deterministic sequencer using registered outputs and ITD circuits to monitor voltage rails and assert enable signals with nanosecond precision.

Use Value: Pin-controlled power-down mode reduces quiescent current to <5 mA during standby; programmable reset hysteresis prevents brownout-induced state corruption.

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
ATF1502AS-10JX44	Slower -10 speed grade (10 ns tPD, 100 MHz fCNT) with identical macrocell count, pinout, and feature set.	Suitable where 125 MHz timing margin is unnecessary; lower power consumption in reduced-speed applications.	Select when system clock rates ≤ 80 MHz and cost optimization is prioritized over maximum performance.
XC9536-10PC44C	Xilinx CoolRunner-II architecture; 36 macrocells, 5 V tolerant I/O, but no native PCI compliance or pin-keeper option.	Requires external pull-ups and level-shifting for PCI bus interfacing; lacks integrated power-down control pins.	Choose only if existing Xilinx toolchain and BSDL infrastructure are already deployed; verify timing closure for 7.5 ns paths.

Compared with ATF1502AS-7JX44, the -10JX44 offers identical functionality at relaxed timing for cost-sensitive designs, while the XC9536-10PC44C requires external components to match PCI drive strength and lacks hardware power-down - making ATF1502AS-7JX44 the sole option supporting pin-keeper, slew control, and PCI compliance in one 44-TQFP device.

Availability

ATF1502AS-7JX44 is available at Aetrix Electronics and suitable for industrial motor control, legacy system emulation, PCI add-in card interface, and programmable power sequencing requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for ATF1502AS-7JX44 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 family, including datasheets, programming tools, and long-term manufacturing commitments for industrial-grade CPLDs.

The ATF1502AS series was designed as a high-reliability, EEPROM-based CPLD platform targeting replacement of obsolete TTL/PLD logic in aerospace, industrial automation, and telecom infrastructure - emphasizing in-system programmability, PCI compatibility, and robust power management.

FAQ

What is the operating temperature range for ATF1502AS-7JX44?

The ATF1502AS-7JX44 is rated for industrial temperature operation from –40°C to +85°C, as confirmed in Table 11-2 of the official datasheet. This range applies to both DC and AC characteristics, and the device maintains full 7.5 ns pin-to-pin delay and 125 MHz registered performance across the entire span without derating. The "J" in the part number denotes industrial grade, distinguishing it from commercial-grade variants.

Does ATF1502AS-7JX44 support in-system programming (ISP) without removing it from the PCB?

Yes, ATF1502AS-7JX44 supports full IEEE 1149.1-compliant in-system programming via its dedicated JTAG TAP interface (pins 4/TDI, 7/TMS, 8/TCK, 9/TDO). Programming can be performed using standard SVF files and third-party tools or Microchip's own software, with no need to remove the device from the board. The JTAG interface remains functional even when the security fuse is programmed.

Can the PD1 and PD2 pins on ATF1502AS-7JX44 be used as general-purpose I/Os?

No - when the power-down feature is enabled in the design file, PD1 and PD2 become dedicated active-high control inputs and cannot function as logic I/Os. However, their associated macrocells remain usable for buried feedback and cascade logic generation. If power-down is not required, those pins default to standard I/O functionality with full macrocell resource access.

What is the maximum number of product terms available per macrocell in ATF1502AS-7JX44?

The ATF1502AS-7JX44 provides 5 base product terms per macrocell, expandable up to 40 via cascade logic from neighboring macrocells - a capability confirmed in the "Features" section and Figure 2-1 block diagram. This expansion is handled automatically by the design compiler and does not require manual routing; the 40-term limit applies to sum-of-products logic within a single cascade chain.

Is ATF1502AS-7JX44 RoHS compliant and halogen-free?

Yes, ATF1502AS-7JX44 is manufactured in green (Pb/Halide-free/RoHS-compliant) package options, as explicitly stated in the "Features" section of the datasheet. The 44-lead TQFP package uses lead-free solderable terminations and complies with EU Directive 2011/65/EU and JEDEC JS709B standards for halogen content.

ATF1502AS-7JX44 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:: 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-PLCC (16.6x16.6)

ATF1502AS-7JX44 FAQ

1.How can I place an order for ATF1502AS-7JX44 through Aetrix?

Please submit a Request for Quotation (RFQ) for ATF1502AS-7JX44 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-7JX44 reliable?

The price and inventory of ATF1502AS-7JX44 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ATF1502AS-7JX44 is usually 5 days.

3.What payment methods are accepted for ATF1502AS-7JX44?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ATF1502AS-7JX44 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ATF1502AS-7JX44?

ATF1502AS-7JX44 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ATF1502AS-7JX44 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-7JX44?

For technical support, including ATF1502AS-7JX44 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ATF1502AS-7JX44 requirements.

6.How does Aetrix verify that ATF1502AS-7JX44 is sourced from the original manufacturer or authorized distributors?

All ATF1502AS-7JX44 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-7JX44 meets industry standards.

7.What is the process for return or replacement of ATF1502AS-7JX44?

All ATF1502AS-7JX44 units undergo pre-shipment inspection (PSI). If there is an issue with ATF1502AS-7JX44, 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-7JX44 part is unused and in its original packaging.

Return procedure for ATF1502AS-7JX44:

1.Submit a request within 90 days.

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

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