Microchip Technology ATF1502ASL-25JI44

Overview

ATF1502ASL-25JI44 from Atmel (now Microchip) 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 supports in-system programming via JTAG and targets logic consolidation in industrial control, PCI interface bridging, and legacy TTL replacement.

For engineers reviewing the ATF1502ASL-25JI44 datasheet, ATF1502ASL-25JI44 pinout, ATF1502ASL-25JI44 application, or ATF1502ASL-25JI44 equivalent, key selection criteria include its 10 µA standby current (L-version), JTAG boundary-scan compliance (IEEE 1149.1), PCI-compliant I/O drive, programmable slew rate, and power-down mode controlled by PD1/PD2 pins.

Technical Context

The ATF1502ASL-25JI44 implements a flexible macrocell architecture with five sections per macrocell: product term array, OR/XOR/cascade logic, D/T-latch-configurable flip-flop, output select/enable, and logic array inputs. Each macrocell supports buried registered feedback independent of output configuration, enabling dual-latch behavior within a single macrocell.

Its global bus carries all 32 macrocell feedback signals plus all I/O and dedicated input pins, feeding a switch matrix that selects up to 40 signals per logic block. The device includes three global clock pins (GCLK1–GCLK3), ITD circuits on clocks/inputs/I/O (L-version only), and programmable pin-keeper for floating-input stabilization without external resistors.

Key Specifications

Pinout & Package

ATF1502ASL-25JI44 is housed in a 44-lead Thin Quad Flat Package (TQFP) with 0.8 mm lead pitch, JEDEC MO-153 compliant, and rated for industrial temperature range (−40°C to +85°C).

Key Features

Applications

Equivalent & Alternatives

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

Compared with XCR3064XL-10VQ44C and LC4032ZC-75M48I, the ATF1502ASL-25JI44 uniquely combines 5 V PCI compliance, 10 µA standby, and JTAG ISP in a 44-pin TQFP - making it the only option for retrofitting industrial 5 V systems requiring certified boundary-scan testability and zero-layout-change upgrades.

Availability

ATF1502ASL-25JI44 is available at Aetrix Electronics and suitable for industrial motion control, PCI interface adaptation, and legacy system emulation requiring stable component supply over extended production lifecycles.

Supply support for ATF1502ASL-25JI44 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) is a leading provider of microcontrollers, analog components, and programmable logic solutions with focus on reliability and long-term supply assurance.

The ATF1502ASL series belongs to Atmel's high-performance EEPROM-based CPLD family, designed specifically for logic consolidation, interface bridging, and obsolescence mitigation in industrial and automotive applications where non-volatility, in-system programmability, and 5 V robustness are critical.

FAQ

What is the operating temperature range for ATF1502ASL-25JI44?

The ATF1502ASL-25JI44 is rated for industrial temperature range: −40°C to +85°C. This is confirmed in the DC Operating Conditions table and Absolute Maximum Ratings section of the official datasheet (Rev. 0995J). Its "L" suffix denotes low-power capability and industrial-grade qualification, distinguishing it from commercial-grade ATF1502AS variants.

Does ATF1502ASL-25JI44 support JTAG boundary-scan testing?

Yes, ATF1502ASL-25JI44 fully supports IEEE Std. 1149.1-1990 and 1149.1a-1993 boundary-scan testing. It includes dedicated TDI, TDO, TMS, and TCK pins, each with its own boundary-scan cell (BSC), and implements all five standard JTAG modes: SAMPLE/PRELOAD, EXTEST, BYPASS, IDCODE, and HIGHZ. The TAP controller resets automatically at power-up, eliminating need for TRST.

What is the maximum clock frequency supported by ATF1502ASL-25JI44?

The ATF1502ASL-25JI44 supports a maximum internal global clock frequency of 125 MHz under the -25 speed grade, as specified in the AC Characteristics table (fCNT = 125 MHz for -25). Its maximum system clock frequency is 166.7 MHz, but this applies only to specific array-clock configurations; registered logic reliably operates at 125 MHz with guaranteed timing margins.

How does the power-down mode function on ATF1502ASL-25JI44?

When enabled in the design file, the power-down mode on ATF1502ASL-25JI44 activates when PD1 or PD2 is driven high, reducing supply current to <1 mA. All internal logic states and output levels are latched and held. Inputs (except PD pins) are blocked, and pin-keeper circuits maintain I/O states. Recovery occurs within 1 µs after PD returns low, as verified in the Power-down AC Characteristics table (tDLIV = 1 µs).

Is ATF1502ASL-25JI44 compatible with PCI bus specifications?

Yes, ATF1502ASL-25JI44 is explicitly PCI-compliant per the datasheet's PCI DC and AC Characteristics tables. It meets required VOH (≥2.4 V at –2 mA), VOL (≤0.55 V at 3–6 mA), drive strength (±44 mA high/±95 mA low), and slew rate (1–5 V/ns) for 5 V signaling. Its high-current outputs operate without external buffers, and it exhibits 200 mA latch-up immunity per pin.