ATF1504ASL-25AU44 - 64-Macrocell 5V ISP CPLD, 25ns | Microchip
MPN: ATF1504ASL-25AU44 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $4.92 | $4.92 |
| 10 | $4.42 | $44.20 |
| 100 | $3.94 | $394.00 |
| 500 | $3.55 | $1,775.00 |
| 1,000 | $3.15 | $3,150.00 |
ATF1504ASL-25AU44 Overview
A complex programmable logic device (CPLD) is a non-volatile, electrically erasable digital logic IC that integrates multiple PAL-like macrocell arrays on a single die, with a programmable AND/OR interconnect fabric in between. CPLDs sit between simple SPLD/GAL devices and larger FPGAs in the programmable-logic hierarchy, and are used for glue logic, bus interfacing, state-machine decoding, and high-density combinatorial replacement where deterministic timing and instant-on behavior are required. The ATF15xx series in particular is a 5 V legacy family known for ISP and high pin-keeper drive strength.
Key features of this part include 25 ns pin-to-pin propagation delay (tPD), 60 MHz maximum operating frequency, a minimum of 10,000 program/erase cycles, JTAG-based IEEE 1149.1 boundary-scan and ISP, pin-keeper circuits on inputs and I/Os, and programmable power management for low-power macrocell operation. The "L" suffix denotes the lower-power process option; "A" denotes the standard 44-pin TQFP package; "U44" specifies a green / Pb-free TQFP-44 package.
The device is built on Microchip/Atmel's proven electrically-erasable (EE) technology, which gives non-volatile storage of the user logic - the part functions at power-up with no external configuration PROM. Architecturally, the four logic blocks each contain 16 macrocells feeding a connected global interconnect, with per-pin output enable, slew-rate, and pin-keeper options set during programming.
Typical applications include 5 V bus interface and voltage-translation logic, address decoding and chip-select generation in legacy microprocessor systems, industrial control glue logic, state-machine replacement for discrete 74xx logic, and instant-on control logic in motor drives and instrumentation. The wide 5V nature tolerance and industrial -40C to +85C temperature range also suit harsh environment controllers.
When designing with this device, ensure the JTAG chain order is maintained if multiple ATF1504ASL devices share TCK/TMS/TDI, and add a 0.1 uF decoupling capacitor near each VCC pin. The ISP programming voltage is generated internally, so no external 12 V programmer supply is required. Power sequencing is straightforward due to the non-volatile configuration.
This page synthesizes Microchip product-page data, distributor pricing from DigiKey/Mouser, and engineering guidance for the ATF1504ASL family - information not found in the standalone datasheet.
Drop-in alternatives for ATF1504ASL-25AU44 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with ATF1504ASL-25AU44 (same form factor and footprint) — differing in Operating Temperature, Package, Propagation Delay (tPD), Series, User I/O Pins.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ATF1504ASL-25AU44-T
✅ Drop-In📋 Reference alternative (not in catalog)
ATF1504ASL-25AI44
✅ Drop-In📋 Reference alternative (not in catalog)
ATF1504ASL-25AU44-T-ND
✅ Drop-In📋 Reference alternative (not in catalog)
ATF1504AS-10AU44
✅ Drop-In📋 Reference alternative (not in catalog)
ATF1504ASL25AU44
✅ Drop-In✓ In Stock
$3.66 / Unit
View Datasheet →ATF1504ASL-25AU44 Maximum Ratings & Electrical Characteristics
| Product Type | CPLD (Complex Programmable Logic Device) |
| Series | ATF15xx (ATF1504ASL) |
| Macrocells | 64 |
| Logic Blocks | 4 (16 macrocells each) |
| Registers | 64 |
| User I/O Pins | 68 |
| Propagation Delay (tPD) | 25 ns |
| Maximum Clock Frequency | 60 MHz |
| Supply Voltage (VCC) | 4.5 V to 5.5 V |
| Program / Erase Cycles | 10000 minimum |
| In-System Programmability | Yes (IEEE 1149.1 JTAG) |
| Operating Temperature | -40 C to +85 C (Industrial) |
| Package | 44-pin TQFP (U44), 10x10 mm |
| Mounting Type | Surface Mount |
| RoHS / Pb-Free | Yes (Green package) |
| Process Option | L (Low Power) |
ATF1504ASL-25AU44 44-pin tqfp (u44), 10x10 mm Pin Configuration Guide
Pin configuration for ATF1504ASL-25AU44 (44-pin tqfp (u44), 10x10 mm package). This digital IC includes GPIO, communication interfaces (UART, SPI, I2C), and power pins. Refer to the manufacturer datasheet for alternate pin functions and configuration options. Essential for embedded system design and PCB layout.
No detailed pinout data available for ATF1504ASL-25AU44.
Refer to the datasheet for full pin configuration.
Typical Applications
ATF1504ASL-25AU44 is suitable for 7 applications: 5V Address Decoding & Chip-Select Logic, Industrial PLC Digital I/O Expansion, Legacy 74xx Logic Replacement, Motor-Drive Interface & PWM Control, Test & Measurement Instrumentation Front-End, Vehicle ECU Custom I/O Logic, Consumer Audio Legacy Interface Bridging.
5V Address Decoding & Chip-Select Logic
The ATF1504ASL-25AU44 is widely used for address decoding and chip-select generation in 5V-only memory and peripheral systems. Its 64 macrocells and 68 user I/Os allow an engineer to consolidate 8 to 15 PAL/GAL devices into one part, while the 25 ns tPD keeps the decode delay well below one 8 MHz/16 MHz ISA or 68000 bus cycle. The 4.5V to 5.5V supply and 5V-tolerant I/Os match TTL/CMOS 5V logic levels without level-shifters. Programming is via JTAG on-board, simplifying board bring-up and field upgrades. Use a 0.1 uF decoupling cap per VCC pin and keep the global clock pin short.
Recommended
Industrial PLC Digital I/O Expansion
In PLC and industrial I/O subsystems, the ATF1504ASL-25AU44 provides glue logic between microcontrollers, optocouplers, and high-voltage driver stages. Its -40 C to +85 C industrial temperature rating and 5V supply align with PLC backplane rails, while 10000 program/erase cycles support firmware revisions. The non-volatile EE configuration gives instant-on logic at power-up - critical for safety interlocks and emergency-stop decoding that must be active before the MCU boots. The 60 MHz maximum clock supports high-speed encoder pulse handling.
Recommended
Legacy 74xx Logic Replacement
The ATF1504ASL-25AU44 is an excellent replacement for banks of 74xx TTL/CMOS glue logic, integrating decoders, multiplexers, latches, and small state machines into a single non-volatile IC. The 64 macrocells absorb roughly 20 to 30 standard SSI/MSI packages, reducing board area, power draw, and inventory SKUs. Designers use CUPL or WinCUPL HDL to capture legacy schematics, then program the device once on-board via JTAG. The 25 ns tPD matches classic 74LS/74F propagation delays.
Recommended
Motor-Drive Interface & PWM Control
The ATF1504ASL-25AU44 implements PWM gating logic, fault handling, and brake-control state machines for 5V-logic motor drivers. Its 60 MHz clock allows generation of carrier frequencies up to several hundred kHz when combined with internal counters, and its 64 macrocells can hold multi-axis sequencing logic. The non-volatile instant-on behavior ensures the motor-drive protection logic is active during MCU boot. Industrial temperature range and JTAG field-reprogramming simplify in-service updates on factory-floor equipment.
Recommended
Test & Measurement Instrumentation Front-End
Bench-top test equipment uses the ATF1504ASL-25AU44 for front-end signal routing, range switching, and trigger logic. Its 25 ns tPD supports sub-100 ns trigger-to-output latency for oscilloscope and logic-analyzer front-ends, while 68 user I/Os handle multiplexing for multi-channel digitizers. JTAG programming enables rapid front-panel reconfiguration between test modes. The 5V supply aligns with legacy instrumentation rails; pin-keeper circuits prevent floating inputs during range-switch transitions.
Recommended
Vehicle ECU Custom I/O Logic
The ATF1504ASL-25AU44 implements custom I/O decoding and timing logic in 5V vehicle ECUs - particularly in body-control, instrument-cluster, and lighting modules. Its industrial temperature rating covers under-hood and cabin environments for non-safety ECUs, and 10000 program/erase cycles allow lifetime firmware revisions. The non-volatile configuration eliminates boot delay for time-critical functions such as lighting PWM and turn-signal sequencing. For AEC-Q100-qualified automotive applications, consider ATF1504ASL automotive-graded variants.
Recommended
Consumer Audio Legacy Interface Bridging
In 5V audio equipment such as legacy mixers, effects units, and MIDI controllers, the ATF1504ASL-25AU44 handles format conversion between AES/EBU, S/PDIF, MIDI, and parallel control buses. Its 60 MHz clock supports AES3 frame-rate processing, and 64 macrocells implement multi-channel routing matrices. The instant-on behavior ensures glitch-free audio at power-up. The 5V supply is required for direct interface to legacy audio DAC and ADC chips without level-shifters.
Recommended
Recommended Products Summary
Engineering reference data for ATF1504ASL-25AU44 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATF1504ASL-25AU44-T | ATF1504ASL-25AI44 | ATF1504ASL25AU44 | ATF1504AS-10AU44 | ATF1504ASL-25AU44-T-ND |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | TQFP-44 (10x10 mm) | TQFP-44 - same | TQFP-44 - same | TQFP-44 - same | TQFP-44 - same | TQFP-44 - same |
| Macrocells | 64 | 64 | 64 | 64 | 64 | 64 |
| Propagation Delay (tPD) | 25 ns | 25 ns | 25 ns | 25 ns | 10 ns (60% faster) | 25 ns |
| Maximum Clock Frequency | 60 MHz | 60 MHz | 60 MHz | 60 MHz | ~100 MHz | 60 MHz |
| Supply Voltage | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 4.5 V to 5.5 V |
| Process / Power Option | L (Low Power) | L (Low Power) | L (Low Power) | L (Low Power) | Standard (higher Icc, faster) | L (Low Power) |
| Operating Temperature | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C (Industrial) | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C |
| JTAG ISP | Yes (IEEE 1149.1) | Yes | Yes | Yes | Yes | Yes |
Key Differentiators
- Drop-in pin-compatibility across all ATF1504ASL 25 ns 5V TQFP-44 variants (vs ATF1504ASL-25AU44-T)
- 60% faster propagation delay versus the 25 ns base part while keeping the same footprint (vs ATF1504AS-10AU44)
- Low-power process option reduces quiescent current (vs ATF1504AS-10AU44)
- Non-volatile EE configuration provides instant-on logic at power-up (vs FPGA solutions)
Design Notes
Place a 0.1 uF decoupling ceramic capacitor within 5 mm of each VCC pin on the TQFP-44 footprint, plus a bulk 10 uF to 47 uF tantalum or low-ESR ceramic at the board supply input. Estimated: at 60 MHz toggle with 32 outputs switching 10 pF loads simultaneously, the per-pin supply current spike can reach 30 mA peaks; insufficient bulk causes VCC droop that can corrupt the JTAG ISP state machine. Use a star-ground topology if the board mixes analog and digital sections.
The TQFP-44 (10x10 mm) has 0.8 mm pitch leads; route all signals on inner layers to break out the dense TQFP pin field. Use a 4-layer stack-up with continuous ground plane beneath the CPLD for shielding and thermal spreading. Keep JTAG TCK trace shorter than 150 mm and series-terminate with 33 ohm to prevent ringing on long chains when multiple CPLDs share JTAG. Avoid running switching signals under the device package to minimize coupling into the JTAG TAP controller.
Critical pitfalls: (1) Always issue JTAG BYPASS to all CPLDs not currently being programmed, otherwise JTAG chain length miscalculation causes programming failure. (2) Pin-keeper circuits hold last logic level on inputs when floating, but pin-keeper cannot replace explicit pull-up resistors on bus signals - add 10k pull-ups externally. (3) The ATF1504ASL uses a non-standard BSDL file; ensure your JTAG boundary-scan tool supports the ATF15xx BSDL revision. (4) Do not exceed 7 mA per output DC - this part is not a high-current driver.
Route global clock (CLK1/CLK2) traces first, kept short and away from I/O switching activity. Place the GND pin return for each output within 10 mm to minimize ground-bounce, which on a 5V TQFP-44 device can shift logic levels by 0.4 V with 32 simultaneously switching outputs. Estimated: at full 32-bit simultaneous output switching at 60 MHz, ground-bounce-induced noise can approach 1 V peak - well beyond 5V TTL noise margin of 0.4 V. Stagger output edges by using the slew-rate control if available.
Compliance Information
RoHS / Pb-free Green package per Microchip ATF1504ASL product page. Not AEC-Q100 qualified - use automotive-graded ATF1504 variants for vehicle applications. REACH compliance assumed per Microchip product-level declarations.
