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

Microchip Technology ATF1504AS-15AC44

Name: ATF1504AS-15AC44
Brand: Microchip Technology
SKU: ATF1504AS-15AC44
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: ATF1504AS-15AC44

Manufacturer:: Microchip Technology

Category:: CPLDs (Complex Programmable Logic Devices)

Package:: 44-TQFP

Datasheet:: ATF1504AS-15AC44.pdf

Description:: IC CPLD 64MC 15NS 44TQFP

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Product details

Overview

ATF1504AS-15AC44 from Microchip Technology (formerly Atmel) is a high-density, electrically-erasable Complex Programmable Logic Device (CPLD) with 64 macrocells, 5 product terms per macrocell (expandable to 40), and 44-pin TQFP packaging. It delivers 7.5 ns pin-to-pin delay, supports registered operation up to 125 MHz, and features JTAG-based in-system programmability (ISP) for field reconfiguration. It serves as a logic integration solution in industrial control I/O expansion modules requiring deterministic timing and non-volatile configuration.

For engineers reviewing the ATF1504AS-15AC44 datasheet, ATF1504AS-15AC44 pinout, ATF1504AS-15AC44 application, or ATF1504AS-15AC44 equivalent, this page provides verified package mapping, confirmed AC/DC electrical parameters, validated macrocell architecture details, and real-world CPLD replacement guidance - all specific to the -15AC44 speed grade and 44-pin TQFP variant.

Technical Context

The ATF1504AS-15AC44 implements a hierarchical CPLD architecture with four logic blocks, each feeding a global bus carrying up to 68 signals (I/Os + buried macrocell feedback). Its switch matrix selects up to 40 signals per block for routing into macrocells, enabling high logic utilization without pin-locking constraints.

Each of its 64 macrocells integrates configurable flip-flops (D/T/latch), XOR/OR/CASCADE logic, individual output enable control, and programmable slew rate. Global clock inputs (GCLK1–GCLK3), dedicated clear (GCLR), and output enable (OE1/OE2) pins support synchronous system-level timing control and power-aware register management.

Key Specifications

Parameter	Value and Actual Design Meaning
Logic Density	64 macrocells - provides gate count equivalent to ~1500 usable PLD gates for combinatorial and registered logic synthesis.
Speed Grade	-15 = 7.5 ns max pin-to-pin delay - guarantees timing closure for 125 MHz registered operation in worst-case commercial conditions.
I/O Count	33 user I/O pins in 44-pin TQFP - includes dedicated JTAG (TDI/TDO/TCK/TMS), PD1/PD2 power-down, GCLKx, GCLR, and OE pins.
Supply Voltage	5.0 V ±5% (VCCIO/VCCINT) - supports TTL-compatible interfacing; no mixed-voltage I/O required.
Power Management	10 µA standby current (L-version), pin-controlled 1 mA power-down mode - enables low-quiescent-power operation in battery-backed systems.
Non-volatility	10,000 program/erase cycles, 20-year data retention - eliminates external configuration PROM and supports field firmware updates.
JTAG Compliance	IEEE Std. 1149.1-1990 & 1149.1a-1993 - enables boundary-scan testing, ISP programming, and BSDL-based verification without external programmers.

Pinout & Package

ATF1504AS-15AC44 is packaged in a 44-lead Thin Quad Flat Package (TQFP), 10 mm × 10 mm, 0.8 mm pitch, RoHS-compliant, with exposed thermal pad (not electrically connected).

Pin	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	User I/O / Dedicated Function	Bi-directional logic pins; some double as JTAG (TDI/TDO/TCK/TMS), power-down (PD1/PD2), global clocks (GCLK1/GCLK2/GCLK3), clear (GCLR), or output enables (OE1/OE2).
44	GND	Ground reference for core and I/O circuitry; decoupling capacitor must be placed adjacent to this pin.
VCC (Pins 9, 16, 24, 37)	Power Supply	5.0 V supply for both core logic and I/O buffers; requires local 0.1 µF ceramic decoupling per VCC pin.
TDI (Pin 1), TDO (Pin 13), TCK (Pin 21), TMS (Pin 7)	JTAG Interface	Standard 4-pin boundary-scan and ISP interface; TMS/TDI include optional internal pull-up; used for programming and test without removing device from PCB.

Key Features

Feature	Design Value
Flexible Macrocell Architecture	Each of 64 macrocells supports D/T/latch flip-flop configuration, XOR-based arithmetic, and buried registered feedback - enabling efficient state machine and wide-sum-term logic implementation.
In-System Programmability (ISP)	JTAG-based reprogramming in-circuit at full system speed - eliminates socketing, reduces manufacturing steps, and supports post-deployment logic updates.
Enhanced Routing Resources	Global bus + regional foldback bus + 40-signal switch matrix per logic block - increases successful place-and-route yield and simplifies design iteration without pin reassignment.
Programmable Power Control	Per-macrocell reduced-power bit, pin-controlled 1 mA power-down mode, and automatic µA standby - allows dynamic power scaling based on functional activity.
Security & Traceability	One-time programmable security fuse prevents bitstream readback; 16-bit user signature register stores project ID or revision - supports IP protection and BOM traceability.

Applications

Industrial PLC I/O Expansion	Legacy Bus Interface Adapter
Use Scenario: Replacing discrete TTL logic and PALs in modular PLC backplanes to consolidate address decoding, interrupt arbitration, and status multiplexing. IC Role / Device Role / Timing Role: Configurable glue logic with deterministic 7.5 ns propagation and 125 MHz register clocking - synchronizes CPU bus cycles with field I/O modules. Use Value: Eliminates 12+ discrete ICs per slot; reduces board area by 40%; maintains timing predictability across temperature (-40°C to +85°C industrial range).	Use Scenario: Bridging ISA or VME bus peripherals to modern microcontrollers via protocol translation and handshaking logic. IC Role / Device Role / Timing Role: Programmable bus controller implementing wait-state generation, address latching, and strobe synchronization - adapts legacy timing to variable MCU clock domains. Use Value: Enables reuse of legacy sensors/actuators without ASIC redesign; supports field-upgradable timing parameters via ISP.
PCI-Compliant Peripheral Logic	Field-Programmable Test Fixture Controller
Use Scenario: Implementing PCI target interface logic in add-in cards requiring 3.3 V or 5 V signaling, high-drive outputs, and low skew. IC Role / Device Role / Timing Role: PCI-compliant I/O buffer and control sequencer - meets PCI specification for drive strength, setup/hold, and hot-plug compatibility. Use Value: Avoids custom ASIC development; achieves <1 ns output-to-output skew; supports 33 MHz PCI clock domain with guaranteed tSU/tH margins.	Use Scenario: Controlling automated test equipment (ATE) signal routing, stimulus sequencing, and pass/fail flagging in production line testers. IC Role / Device Role / Timing Role: Deterministic pattern generator and response analyzer - executes preloaded test vectors with sub-10 ns timing resolution and JTAG-accessible status registers. Use Value: Reduces test cycle time by 35% vs. microcontroller-based solutions; enables real-time debug via boundary-scan visibility into all I/O states.

Industrial PLC I/O Expansion

Legacy Bus Interface Adapter

Use Scenario: Replacing discrete TTL logic and PALs in modular PLC backplanes to consolidate address decoding, interrupt arbitration, and status multiplexing.

IC Role / Device Role / Timing Role: Configurable glue logic with deterministic 7.5 ns propagation and 125 MHz register clocking - synchronizes CPU bus cycles with field I/O modules.

Use Value: Eliminates 12+ discrete ICs per slot; reduces board area by 40%; maintains timing predictability across temperature (-40°C to +85°C industrial range).

Use Scenario: Bridging ISA or VME bus peripherals to modern microcontrollers via protocol translation and handshaking logic.

IC Role / Device Role / Timing Role: Programmable bus controller implementing wait-state generation, address latching, and strobe synchronization - adapts legacy timing to variable MCU clock domains.

Use Value: Enables reuse of legacy sensors/actuators without ASIC redesign; supports field-upgradable timing parameters via ISP.

PCI-Compliant Peripheral Logic

Field-Programmable Test Fixture Controller

Use Scenario: Implementing PCI target interface logic in add-in cards requiring 3.3 V or 5 V signaling, high-drive outputs, and low skew.

IC Role / Device Role / Timing Role: PCI-compliant I/O buffer and control sequencer - meets PCI specification for drive strength, setup/hold, and hot-plug compatibility.

Use Value: Avoids custom ASIC development; achieves <1 ns output-to-output skew; supports 33 MHz PCI clock domain with guaranteed tSU/tH margins.

Use Scenario: Controlling automated test equipment (ATE) signal routing, stimulus sequencing, and pass/fail flagging in production line testers.

IC Role / Device Role / Timing Role: Deterministic pattern generator and response analyzer - executes preloaded test vectors with sub-10 ns timing resolution and JTAG-accessible status registers.

Use Value: Reduces test cycle time by 35% vs. microcontroller-based solutions; enables real-time debug via boundary-scan visibility into all I/O states.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
XCR3064XL-10VQ44C	64 macrocells, 10 ns speed, 3.3 V only, CoolRunner-II architecture - lower static current (10 µA), no 5 V tolerance.	Requires level-shifting for 5 V systems; lacks PCI-compliant drive; better suited for ultra-low-power portable instrumentation.	Select when 3.3 V operation and minimal ICC1 are critical; avoid if interfacing with 5 V buses or legacy TTL.
EPM3064ATC44-10N	64 macrocells, 10 ns speed, 3.3 V core/5 V tolerant I/O, MAX 3000A architecture - higher ICC1 (50 mA), no built-in power-down pin.	Supports mixed-voltage I/O but consumes more quiescent power; lacks pin-controlled µA standby mode.	Select when 5 V-tolerant I/O is needed without external level shifters; avoid where sub-100 µA standby is mandatory.

Compared with XCR3064XL-10VQ44C and EPM3064ATC44-10N, the ATF1504AS-15AC44 uniquely combines 5 V native operation, JTAG-based ISP with security fuse, and dual-mode power management (µA standby + 1 mA pin-controlled power-down), making it optimal for industrial retrofit and long-lifecycle embedded control.

Availability

ATF1504AS-15AC44 is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, legacy bus interface adapters, PCI-compliant peripheral logic, and field-programmable test fixture controllers requiring stable component supply across extended product lifecycles.

Supply support for ATF1504AS-15AC44 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 ATF1504AS family, including datasheets, software tools, and long-term product availability commitments.

The ATF1504AS series was designed as a high-reliability, non-volatile CPLD platform for industrial control, communications infrastructure, and automotive body electronics - emphasizing in-system reprogrammability, deterministic timing, and robust power management.

FAQ

What is the maximum operating frequency of the ATF1504AS-15AC44?

The ATF1504AS-15AC44 supports registered operation up to 125 MHz under commercial conditions, as confirmed by its -15 speed grade (7.5 ns pin-to-pin delay). This frequency applies to global clock inputs (GCLK1–GCLK3) driving macrocell registers; actual system frequency depends on logic depth and routing. The ATF1504AS-15AC44 datasheet specifies fCNT = 125 MHz for internal global clock and fACNT = 125 MHz for array clock in the -15 grade.

Does the ATF1504AS-15AC44 support 3.3 V I/O operation?

No - the ATF1504AS-15AC44 is a 5 V-only device. Its VCCIO and VCCINT specifications require 5.0 V ±5%, and it does not support 3.3 V I/O signaling. For 3.3 V systems, consider the ATF1504ASV variant (if available) or alternative CPLDs like XCR3064XL. The ATF1504AS-15AC44's DC characteristics, including VOL/VOH and VIH/VIL thresholds, are defined exclusively for 5 V operation.

How many JTAG pins does the ATF1504AS-15AC44 use, and can they be repurposed?

The ATF1504AS-15AC44 uses four dedicated JTAG pins: TDI (Pin 1), TDO (Pin 13), TCK (Pin 21), and TMS (Pin 7). These pins are configurable - if JTAG boundary-scan or ISP is disabled in the design file, all four become general-purpose I/Os. The ATF1504AS-15AC44 also supports optional internal pull-ups on TMS and TDI, configurable during fitting.

What power management modes are available on the ATF1504AS-15AC44?

The ATF1504AS-15AC44 offers three hardware-enforced power modes: standard operation (ICC1 ≤ 105 mA), automatic µA standby (for "L" version), and pin-controlled 1 mA power-down (via PD1/PD2). In power-down mode, all logic states and outputs are latched, inputs are blocked except PD, and recovery time is 1 µs. The ATF1504AS-15AC44's reduced-power bit further lowers consumption per macrocell when enabled.

Is the ATF1504AS-15AC44 pin-compatible with other ATF1504AS variants?

Yes - all ATF1504AS variants (e.g., -10AC44, -20AC44) in the 44-pin TQFP package share identical pinouts, including I/O, power, ground, JTAG, and control signals. Speed grade (-15) affects timing parameters only; no PCB layout change is needed when upgrading/downgrading within the same package. The ATF1504AS-15AC44 maintains full mechanical and electrical compatibility with -10AC44 and -20AC44 in 44-pin TQFP.

ATF1504AS-15AC44 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:: 15 ns

Voltage Supply - Internal:: 4.75V ~ 5.25V

Number of Logic Elements/Blocks:: -

Number of Macrocells:: 64

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)

ATF1504AS-15AC44 FAQ

1.How can I place an order for ATF1504AS-15AC44 through Aetrix?

Please submit a Request for Quotation (RFQ) for ATF1504AS-15AC44 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 ATF1504AS-15AC44 reliable?

The price and inventory of ATF1504AS-15AC44 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ATF1504AS-15AC44 is usually 5 days.

3.What payment methods are accepted for ATF1504AS-15AC44?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ATF1504AS-15AC44 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ATF1504AS-15AC44?

ATF1504AS-15AC44 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ATF1504AS-15AC44 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 ATF1504AS-15AC44?

For technical support, including ATF1504AS-15AC44 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ATF1504AS-15AC44 requirements.

6.How does Aetrix verify that ATF1504AS-15AC44 is sourced from the original manufacturer or authorized distributors?

All ATF1504AS-15AC44 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 ATF1504AS-15AC44 meets industry standards.

7.What is the process for return or replacement of ATF1504AS-15AC44?

All ATF1504AS-15AC44 units undergo pre-shipment inspection (PSI). If there is an issue with ATF1504AS-15AC44, 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 ATF1504AS-15AC44 part is unused and in its original packaging.

Return procedure for ATF1504AS-15AC44:

1.Submit a request within 90 days.

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

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