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Microchip Technology ATF1502ASL-25AC44
- Part No.:
- ATF1502ASL-25AC44
- Manufacturer:
- Microchip Technology
- Package:
- 44-TQFP
- Datasheet:
-
ATF1502ASL-25AC44.pdf
- Description:
- IC CPLD 32MC 25NS 44TQFP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
ATF1502ASL-25AC44 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 PCI-compliant interface glue logic, state machine control in industrial controllers, and I/O expansion in embedded systems.
For engineers reviewing the ATF1502ASL-25AC44 datasheet, ATF1502ASL-25AC44 pinout, ATF1502ASL-25AC44 application, or ATF1502ASL-25AC44 equivalent, key selection criteria include its 10 µA standby current (L-version), JTAG-based in-system programmability (ISP), PCI-compliant 5V TTL output drive, three global clock inputs, and Input Transition Detection (ITD) circuits on clocks and I/Os - all validated for industrial temperature range (-40°C to +85°C) operation.
Technical Context
The ATF1502ASL-25AC44 implements a flexible macrocell architecture with five sections per macrocell: product term array with 40-term expandability via cascade logic, OR/XOR/CASCADE logic block supporting arithmetic and compare functions, D/T-latch-configurable flip-flop with individual clock enable and asynchronous reset/preset, output select/enable with programmable slew rate and open-collector option, and logic array input routing through enhanced switch matrices. Its global bus carries 32 buried feedback signals plus all I/O and dedicated input pins.
It supports IEEE 1149.1/1149.1a boundary-scan testing and JTAG ISP using TDI/TDO/TMS/TCK pins, with optional pull-ups on TMS/TDI. The device includes three global clock pins (GCLK1–GCLK3), ITD circuits on global clocks, inputs, and I/Os (L-version only), fast registered input from product term, and VCC power-up reset with selectable hysteresis - enabling deterministic state initialization in synchronous digital systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Macrocell Count | 32 macrocells with buried feedback and foldback logic for high-fan-in sum-term generation |
| Product Terms | 5 per macrocell, expandable to 40 via cascade logic for complex Boolean function synthesis |
| Max Pin-to-pin Delay | 7.5 ns (–25 speed grade), enabling reliable timing closure at 125 MHz registered operation |
| Standby Current | 10 µA automatic standby (L-version), critical for low-power industrial monitoring applications |
| PCI Compliance | Fully compliant with PCI 2.2 electrical specs: VOH ≥ 2.4 V @ –2 mA, VOL ≤ 0.55 V @ 3–6 mA |
| Operating Temperature | –40°C to +85°C industrial range, validated for factory automation and motor control environments |
| JTAG Support | IEEE 1149.1-1990/1149.1a-1993 boundary-scan and ISP, enabling board-level test and field firmware updates |
Pinout & Package
ATF1502ASL-25AC44 is housed in a 44-lead Thin Quad Flat Package (TQFP) with 0.8 mm lead pitch, JEDEC MO-153 compliant, and thermal pad exposed on bottom for enhanced heat dissipation in dense PCB layouts.
| 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 | Bi-directional I/O pins configurable as inputs, outputs, or registered feedback paths; dedicated pins serve as GCLR, OE1, GCLK1–GCLK3 |
| 44 | TDI/I/O | JTAG Test Data In pin; also usable as general-purpose I/O when JTAG is disabled in design |
| 3, 6, 37, 40 | TDO/I/O, TMS/I/O, TCK/I/O, TDI/I/O | JTAG boundary-scan and ISP interface pins; retain full macrocell functionality when JTAG is unused |
| 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 38, 39, 41, 42, 43 | GND / VCC | Multiple ground and 5V supply pins distributed for low-noise power delivery and reduced simultaneous switching noise |
Key Features
| Feature | Design Value |
|---|---|
| In-System Programmability (ISP) | Enables field reprogramming via standard 4-pin JTAG without device removal, reducing time-to-fix in deployed systems |
| Programmable Pin-keeper | Prevents floating inputs/I/Os by latching last driven state, eliminating need for external pull-ups and saving board space/power |
| Input Transition Detection (ITD) | Detects signal edges on global clocks, inputs, and I/Os to trigger internal logic events without consuming macrocell resources |
| Reduced-power Macrocell Mode | Per-macrocell power-down bit cuts dynamic current by disabling unused logic paths, lowering total ICC in partial-utilization designs |
| Security Fuse & User Signature | One-time programmable fuse blocks unauthorized read-back; 16-bit user-accessible signature stores revision or project ID |
Applications
| Industrial PLC I/O Expansion | PCI Bus Interface Glue Logic |
|---|---|
Use Scenario: Adding custom digital I/O channels to programmable logic controllers in factory automation cabinets. IC Role / Device Role / Timing Role: CPLD implements address decoding, strobe generation, and bidirectional data buffering between microcontroller and isolated I/O modules. Use Value: 7.5 ns propagation delay ensures cycle-accurate timing with 125 MHz CPU buses; 10 µA standby extends uptime in battery-backed backup systems. | Use Scenario: Interfacing legacy microcontrollers to PCI add-in cards in test equipment and data acquisition systems. IC Role / Device Role / Timing Role: Provides level translation, protocol handshaking, and burst-mode address/data multiplexing compliant with PCI 2.2 electrical specs. Use Value: PCI-compliant VOH/VOL and ±44 mA AC drive capability eliminate need for external bus transceivers; JTAG ISP enables post-deployment firmware patching. |
| Motor Control State Machine | Legacy System Protocol Bridge |
Use Scenario: Implementing safety-critical commutation sequencing and fault response logic in brushless DC motor drives. IC Role / Device Role / Timing Role: Executes real-time finite-state machine controlling gate drivers, current sensing, and overtemperature shutdown with deterministic latency. Use Value: Three global clock inputs allow independent timing domains for PWM generation, ADC sampling, and communication; ITD circuits detect encoder edge transitions for precise position capture. | Use Scenario: Translating RS-485 Modbus commands into SPI register writes for sensor arrays in building management systems. IC Role / Device Role / Timing Role: Acts as protocol converter and packet parser, managing framing, CRC validation, and multi-drop addressing. Use Value: 32 macrocells provide sufficient logic density for full Modbus RTU stack implementation; programmable slew rate reduces EMI on long cable runs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar CPLD applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ATF1502AS-25AC44 | Standard (non-L) version: 60 mA standby current vs. 10 µA; no automatic low-power mode or ITD circuits | Suitable for cost-sensitive commercial applications where power budget allows higher ICC1 | Select only if industrial temperature range and ultra-low standby are not required |
| XCR3064XL-10VQ44C | Xilinx CoolRunner-II CPLD: 64 macrocells, 3.3V core, 10 ns tPD, no native 5V PCI drive; requires level-shifting for 5V buses | Better suited for new 3.3V designs with higher logic density needs but incompatible with direct 5V PCI signaling | Choose when migrating to lower-voltage platforms and adding external voltage translators is acceptable |
Compared with ATF1502AS-25AC44 and XCR3064XL-10VQ44C, the ATF1502ASL-25AC44 uniquely delivers 5V PCI compliance, industrial temperature support, and sub-10 µA standby in a pin-compatible 44-TQFP footprint - making it the only drop-in replacement for legacy Atmel-based industrial controllers requiring zero PCB changes.
Availability
ATF1502ASL-25AC44 is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, PCI bus interface glue logic, and motor control state machine applications requiring stable component supply across extended product lifecycles.
Supply support for ATF1502ASL-25AC44 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(L) family.
The ATF1502AS(L) product line was designed specifically for industrial-grade reprogrammable logic integration - emphasizing in-system programmability, PCI compliance, low-power operation, and robust boundary-scan testability in harsh environments.
FAQ
What is the maximum operating frequency of the ATF1502ASL-25AC44?
The ATF1502ASL-25AC44 supports registered operation up to 125 MHz, as confirmed by its –25 speed grade rating and fCNT = 125 MHz specification in the AC Characteristics table. This maximum frequency applies to global clock-driven registered logic paths; combinatorial paths are limited by the 7.5 ns pin-to-pin delay. The device achieves this performance while maintaining 10 µA standby current and full PCI electrical compliance - a combination not found in competing CPLDs.
Does the ATF1502ASL-25AC44 support JTAG boundary-scan testing?
Yes, the ATF1502ASL-25AC44 fully supports IEEE Std. 1149.1-1990 and 1149.1a-1993 boundary-scan testing via its dedicated TDI/TDO/TMS/TCK pins. Each I/O and input pin has an associated boundary-scan cell (BSC), and the TAP controller automatically resets at power-up - eliminating need for a TRST pin. This capability enables comprehensive board-level interconnect testing and in-system programming without requiring physical access to the device after assembly.
What is the purpose of the PD1 and PD2 pins on the ATF1502ASL-25AC44?
The PD1 and PD2 pins on the ATF1502ASL-25AC44 implement pin-controlled power-down mode: when enabled in the design file and driven high, they reduce supply current to below 1 mA while latching all internal logic states and output levels. During power-down, inputs (except PD pins) are blocked, but pin-keeper circuits maintain I/O states to prevent floating. These pins cannot serve as logic inputs when power-down is active, though their macrocell resources remain usable for buried feedback and cascade logic.
How does the ATF1502ASL-25AC44 achieve PCI compliance?
The ATF1502ASL-25AC44 meets PCI 2.2 electrical specifications through dedicated high-drive output circuitry: VOH ≥ 2.4 V at –2 mA, VOL ≤ 0.55 V at 3–6 mA, and AC drive capability up to –44 mA (pull-up) and +95 mA (pull-down). Its programmable slew rate control minimizes output-to-output skew and system noise, while the absence of external components enables direct connection to 5V PCI buses - verified in the PCI DC/AC Characteristics tables and voltage-to-current curves.
Can the ATF1502ASL-25AC44 be used in place of the ATF1502AS-25AC44?
Yes, the ATF1502ASL-25AC44 is pin-compatible and functionally supersets the ATF1502AS-25AC44, adding automatic 10 µA standby, Input Transition Detection (ITD), and enhanced power management features. All logic resources, pin assignments, and JTAG functionality are identical. The "L" suffix denotes the low-power variant - no PCB or schematic changes are needed for migration, though design files must enable the new L-version features (e.g., ITD, auto-standby) to realize full benefits.
ATF1502ASL-25AC44 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:
- 25 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)
ATF1502ASL-25AC44 FAQ
1.How can I place an order for ATF1502ASL-25AC44 through Aetrix?
Please submit a Request for Quotation (RFQ) for ATF1502ASL-25AC44 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-25AC44 reliable?
The price and inventory of ATF1502ASL-25AC44 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ATF1502ASL-25AC44 is usually 5 days.
3.What payment methods are accepted for ATF1502ASL-25AC44?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ATF1502ASL-25AC44 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ATF1502ASL-25AC44?
ATF1502ASL-25AC44 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ATF1502ASL-25AC44 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-25AC44?
For technical support, including ATF1502ASL-25AC44 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ATF1502ASL-25AC44 requirements.
6.How does Aetrix verify that ATF1502ASL-25AC44 is sourced from the original manufacturer or authorized distributors?
All ATF1502ASL-25AC44 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-25AC44 meets industry standards.
7.What is the process for return or replacement of ATF1502ASL-25AC44?
All ATF1502ASL-25AC44 units undergo pre-shipment inspection (PSI). If there is an issue with ATF1502ASL-25AC44, 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-25AC44 part is unused and in its original packaging.
Return procedure for ATF1502ASL-25AC44:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ATF1502ASL-25AC44 Tags
-
5M40ZE64C5N
Intel
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ATF1502ASV-15AU44
Microchip Technology
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5M80ZE64C5N
Intel
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5M80ZT100C5N
Intel
-
ATF1502AS-10AU44
Microchip Technology
-
ATF1502AS-10JU44
Microchip Technology
-
5M80ZE64I5N
Intel
-
5M80ZT100I5N
Intel
-
LC4032V-75TN48C
Lattice Semiconductor Corporation
-
ATF1504ASV-15AU44
Microchip Technology
-
ATF1504AS-10JU44
Microchip Technology
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5M160ZE64C5N
Intel
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