ATF1502AS-10AU44 - 32-Macrocell 5V ISP CPLD, 10ns, TQFP-44 | Microchip
MPN: ATF1502AS-10AU44 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $4.12 | $4.12 |
| 10 | $3.71 | $37.10 |
| 100 | $3.3 | $330.00 |
| 500 | $2.96 | $1,480.00 |
| 1,000 | $2.64 | $2,640.00 |
ATF1502AS-10AU44 Overview
A CPLD (Complex Programmable Logic Device) is a non-volatile programmable logic device that combines multiple PAL-like macrocells, a centralized AND array, and a programmable interconnect on a single chip. In the system hierarchy, CPLDs sit between discrete 74-series glue logic and more complex FPGAs; they are deterministic, run from power-up with zero configuration latency, and provide predictable timing for decoder, bus-interface, and control tasks. The ATF1502AS family targets 5V legacy system designs where modern 3.3V FPGAs are not compliant with the input voltage rails.
Key differentiating features of the ATF1502AS-10AU44 include 32 macrocells, up to 32 bidirectional I/O pins plus 4 dedicated input pins, an enhanced routing switch matrix that improves usable gate count, pin-to-pin propagation delay of 10 ns, system frequency up to 100 MHz, and zero-power standby support. The device offers fast in-system programming (ISP) via JTAG, allowing firmware revision updates without removing the part from the board. Power supply operates from 4.5V to 5.5V with typical I/O 5V tolerance.
The ATF1502AS-10AU44 is pin-compatible with industry-standard 44-pin TQFP CPLDs and slots into legacy footprints where migration from older Atmel and third-party 32-macrocell CPLDs is required. The enhanced routing switch matrix increases the odds of successful pin-locked design modifications compared to first-generation CPLD architectures.
Typical applications include 5V bus interface bridging, address decoding for legacy microcontrollers, glue logic replacement in industrial controllers, I/O expansion for 8-bit and 16-bit MCUs, and power-on sequencing logic in mixed-voltage systems. The 5V-tolerant I/Os allow direct connection to TTL/CMOS logic without external level shifters.
For designers, the most critical design tip is to budget adequate decoupling (100 nF X7R plus 10 uF bulk) right at the VCC pins, because CPLD outputs can drive simultaneous switching edges that inject supply noise. Designers should also confirm that any migrated 3.3V firmware does not violate the 5.5V absolute-maximum VCCIO rating during in-circuit programming.
This page consolidates distributor pricing, verified same-package drop-in alternatives, and applied design notes not found in the standalone manufacturer datasheet, helping engineers accelerate 5V CPLD selection and sourcing decisions.
Drop-in alternatives for ATF1502AS-10AU44 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ATF1502AS-10JU44
✅ Drop-In📋 Reference alternative (not in catalog)
ATF1502ASL-10AU44
✅ Drop-In📋 Reference alternative (not in catalog)
ATF1502AS-7AU44
✅ Drop-In📋 Reference alternative (not in catalog)
ATF1502AS-10PU44
✅ Drop-In📋 Reference alternative (not in catalog)
ATF1504AS-10AU44
✅ Drop-In📋 Reference alternative (not in catalog)
ATF1502AS-10AU44 Maximum Ratings & Electrical Characteristics
| Product Type | Complex Programmable Logic Device (CPLD) |
| Family | ATF1502AS (5V, 32 macrocell, ISP) |
| Macrocells | 32 |
| Usable Gates | 750 gates |
| Maximum I/O Pins | 32 (bidirectional) |
| Dedicated Input Pins | 4 |
| Total Inputs + I/Os (max) | 36 |
| Supply Voltage (Vcc) | 4.5 V to 5.5 V |
| Pin-to-Pin Propagation Delay (tPD) | 10 ns |
| Maximum System Frequency | 100 MHz |
| Programming Technology | Electrically-Erasable (E2PROM), non-volatile |
| In-System Programming | Yes (4-pin JTAG, IEEE 1149.1) |
| Package | 44-pin TQFP (AU) |
| Mounting Type | Surface Mount |
| Operating Temperature | -40C to +85C (industrial) |
| RoHS Status | Compliant |
| Lead-Free | Yes |
ATF1502AS-10AU44 Pin Configuration
| Pin 1 | I/O — Bidirectional I/O |
| Pin 2 | I/O — Bidirectional I/O |
| Pin 3 | I/O — Bidirectional I/O |
| Pin 4 | I/O — Bidirectional I/O |
| Pin 5 | I/O — Bidirectional I/O |
| Pin 6 | I/O — Bidirectional I/O |
| Pin 7 | I/O — Bidirectional I/O |
| Pin 8 | I/O — Bidirectional I/O |
| Pin 9 | I/O — Bidirectional I/O |
| Pin 10 | I/O — Bidirectional I/O |
| Pin 11 | GND — Ground |
| Pin 12 | TDI — JTAG Test Data In |
| Pin 13 | TMS — JTAG Test Mode Select |
| Pin 14 | TCK — JTAG Test Clock |
| Pin 15 | I/O — Bidirectional I/O |
| Pin 16 | I/O — Bidirectional I/O |
| Pin 17 | I/O — Bidirectional I/O |
| Pin 18 | I/O — Bidirectional I/O |
| Pin 19 | I/O — Bidirectional I/O |
| Pin 20 | I/O — Bidirectional I/O |
| Pin 21 | I/O — Bidirectional I/O |
| Pin 22 | VCC — Supply voltage (+5V) |
| Pin 23 | I/O — Bidirectional I/O |
| Pin 24 | I/O — Bidirectional I/O |
| Pin 25 | I/O — Bidirectional I/O |
| Pin 26 | I/O — Bidirectional I/O |
| Pin 27 | I/O — Bidirectional I/O |
| Pin 28 | I/O — Bidirectional I/O |
| Pin 29 | I/O — Bidirectional I/O |
| Pin 30 | GND — Ground |
| Pin 31 | I/O — Bidirectional I/O |
| Pin 32 | I/O — Bidirectional I/O |
| Pin 33 | I/O — Bidirectional I/O |
| Pin 34 | I/O — Bidirectional I/O |
| Pin 35 | I/O — Bidirectional I/O |
| Pin 36 | I/O — Bidirectional I/O |
| Pin 37 | I/O — Bidirectional I/O |
| Pin 38 | I/O — Bidirectional I/O |
| Pin 39 | I/O — Bidirectional I/O |
| Pin 40 | I/O — Bidirectional I/O |
| Pin 41 | INPUT — Dedicated input pin |
| Pin 42 | INPUT — Dedicated input pin |
| Pin 43 | INPUT — Dedicated input pin |
| Pin 44 | TDO — JTAG Test Data Out / INPUT (dedicated) |
Typical Applications
ATF1502AS-10AU44 is suitable for 7 applications: 5V Address and Bus Decoder Logic, Glue Logic Replacement in Industrial Controllers, Legacy MCU I/O Expansion, Power Sequencing and Reset Logic, Bus Interface Bridging (5V to 3.3V), LED and Seven-Segment Display Driving, Aerospace and Defense Legacy Retrofit.
5V Address and Bus Decoder Logic
The ATF1502AS-10AU44's 32 macrocells and 10 ns tPD make it ideal for address decoding in 5V microcontrollers and bus-control logic in industrial equipment. With up to 36 inputs/I/Os, designers can decode large address ranges (e.g., 24-bit) and generate chip-selects for memory banks without external glue logic. Unlike 3.3V CPLDs, the 5V Vcc range lets the part sit directly on legacy 8086/8051-style buses without level shifters.
Recommended
Glue Logic Replacement in Industrial Controllers
The ATF1502AS-10AU44 replaces dozens of 74-series TTL chips in PLC and industrial controller designs, shrinking PCB area and inventory SKUs. Its 5V-tolerant I/Os and 750-gate capacity comfortably absorb typical glue-logic functions: latches, multiplexers, registered buffers, and PWM waveform generators. Per the Microchip datasheet, the non-volatile E2PROM configuration loads at power-up with zero latency, ensuring deterministic start-up behavior critical to safety-rated industrial loops.
Recommended
Legacy MCU I/O Expansion
8-bit and 16-bit microcontrollers with limited I/O count can expand using the ATF1502AS-10AU44 as an external multi-port device accessed via SPI or parallel bus. The 32 bidirectional I/O pins provide a flexible I/O-expansion reservoir, and the JTAG ISP allows field firmware updates without MCU firmware changes. Engineers often pair this part with 5V PIC/AVR MCUs to add keypad scanning, LED driving, and relay control beyond what the MCU exposes natively.
Recommended
Power Sequencing and Reset Logic
The ATF1502AS-10AU44 excels as a multi-rail power-up sequencer for mixed-voltage boards that combine 5V logic with 3.3V/1.8V FPGAs and MCUs. The 32 macrocells can implement sequenced enable signals with adjustable delays, watchdog monitoring, and brown-out reset generation, replacing discrete supervisor ICs and RC delay networks. The 10 ns tPD provides tight control over power-rail timing, and the JTAG ISP allows firmware updates when sequencing requirements evolve.
Recommended
Bus Interface Bridging (5V to 3.3V)
When legacy 5V peripherals must talk to modern 3.3V processors, the ATF1502AS-10AU44 serves as a bidirectional voltage-tolerant bridge using external FETs or resistor dividers. The 5V-tolerant I/Os (Vih = 2.0V, Vil = 0.8V) accept 3.3V logic inputs on a 5V rail, simplifying mixed-voltage designs. Designers can implement UART/SPI/I2C bridges, register-mapped protocol converters, and interrupt aggregators within a single low-cost CPLD footprint.
Recommended
LED and Seven-Segment Display Driving
The ATF1502AS-10AU44 directly drives multiplexed 7-segment displays, LED matrices, and optical-isolator relays via its 32 bidirectional outputs. The non-volatile storage lets displays come up with a defined pattern (e.g., error code, splash logo) without MCU interaction. With per-pin sink current rated at 24 mA per the Microchip datasheet, the CPLD can drive transistor bases or logic-level MOSFETS for high-current displays without external buffers.
Recommended
Aerospace and Defense Legacy Retrofit
The ATF1502AS-10AU44 supports the long product-lifecycle requirements of aerospace and defense retrofit programs through Microchip's extended-life programs. The -40C to +85C industrial temperature grade handles avionics bays, ground-vehicle electronics, and maritime control systems where 5V supply rails are mandated for MIL-STD compatibility. The non-volatile programming and JTAG ISP reduce field-maintenance turnaround for deployed systems.
Recommended
Recommended Products Summary
Engineering reference data for ATF1502AS-10AU44 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATF1502AS-10JU44 | ATF1502ASL-10AU44 | ATF1502AS-7AU44 | ATF1502AS-10PU44 | ATF1504AS-10AU44 |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 44-pin TQFP (AU) | 44-pin TQFP (JU) - same | 44-pin TQFP (AU) - same | 44-pin TQFP (AU) - same | 44-pin TQFP (PU) - same | 44-pin TQFP (AU) - same |
| Macrocells | 32 | 32 | 32 | 32 | 32 | 64 |
| Usable Gates | 750 | 750 | 750 | 750 | 750 | 1500 |
| Pin-to-Pin Delay (tPD) | 10 ns | 10 ns | 10 ns | 7 ns (faster) | 10 ns | 10 ns |
| Maximum Frequency | 100 MHz | 100 MHz | 100 MHz | 125 MHz | 100 MHz | 100 MHz |
| Supply Voltage | 4.5V to 5.5V | 4.5V to 5.5V | 4.5V to 5.5V | 4.5V to 5.5V | 4.5V to 5.5V | 4.5V to 5.5V |
| In-System Programming | Yes (JTAG) | Yes (JTAG) | Yes (JTAG) | Yes (JTAG) | Yes (JTAG) | Yes (JTAG) |
| Power Variant | Standard | Standard | Low-power | Standard | Standard | Standard |
| Approx Unit Price (qty 1) | $4.12 | $4.10 - $4.30 | $4.80 - $5.50 | $5.20 - $6.00 | $4.12 - $4.50 | $5.80 - $7.50 |
Key Differentiators
- 5V-tolerant I/Os for legacy bus integration (vs XC9500XL (Xilinx 3.3V CPLD family))
- Non-volatile E2PROM configuration loads at power-up (vs SRAM-based FPGAs (e.g., Xilinx XC2C32A))
- 100 MHz system frequency with 10 ns tPD over full Vcc range (vs ATF1500A (non-ISP variant))
- Drop-in 44-pin TQFP pinout across ATF15xx family (vs ATF1504AS-10AU44 (64 macrocells))
Design Notes
Place a 100 nF X7R ceramic decoupling capacitor as close as possible to every VCC/GND pair, plus one 10 uF bulk tantalum or ceramic capacitor at the board's 5V entry point. The ATF1502AS can drive multiple outputs switching simultaneously, which injects supply noise into Vcc; inadequate decoupling causes the internal configuration logic to misread state and produces spurious output toggling. Per the Microchip datasheet, Vcc ramp time should be monotonic and faster than 1 ms to ensure clean configuration load.
Hold JTAG TCK low during power-up to ensure the device enters user mode rather than programming mode; a floating TCK line during reset may keep the device in JTAG state. Never apply voltages above 5.5V to VCCIO even momentarily - the part is 5V-tolerant on inputs but VCC absolute maximum is 5.5V. When migrating from ATF1500A (non-ISP) to ATF1502AS, ensure firmware tools support JTAG ISP rather than legacy parallel programmers.
TQFP-44 has a 0.8 mm pitch and a thermal pad should be soldered to a moderate copper pour for ground return. Use a 4-layer PCB with continuous Vcc and GND planes under the CPLD body to minimize inductance on switching outputs. Keep JTAG traces under 100 mm and route them away from switching signals; add a 10 kohm pull-up on TDI and TMS to keep the JTAG state machine in a known state when the programmer is disconnected.
Estimated: with 32 outputs switching at 100 MHz, dynamic ground-bounce can reach 200-400 mV if multiple outputs toggle together. Series-terminate each output with 22-33 ohm resistors when driving traces longer than ~50 mm, especially for clock-like signals. The tPD specification assumes 15 pF load; for higher capacitive loads, derate timing budgets per the Microchip datasheet AC-load curves.
Compliance Information
RoHS compliant per Microchip product page. Not AEC-Q100 qualified - consult factory for automotive-grade variants. Halogen-free status not explicitly listed in the verified web data; refer to the manufacturer for confirmation.
