Microchip Technology ATF1508ASV-15AC100

Overview

ATF1508ASV-15AC100 from Microchip Technology (formerly Atmel) is a high-density, electrically-erasable Complex Programmable Logic Device (CPLD) with 128 macrocells, 15 ns maximum pin-to-pin delay, and 100-lead TQFP packaging. It operates across 3.0V–3.6V, supports JTAG-based in-system programming (ISP), and delivers registered operation up to 77 MHz. It is used in industrial control logic consolidation, legacy TTL replacement, and FPGA prototyping support circuits.

For engineers reviewing the ATF1508ASV-15AC100 datasheet, ATF1508ASV-15AC100 pinout, ATF1508ASV-15AC100 application, or ATF1508ASV-15AC100 equivalent, key selection criteria include its 128-macrocell logic capacity, JTAG boundary-scan compliance (IEEE 1149.1), programmable slew rate per output, pin-controlled power-down capability via PD1/PD2, and PCI-compliant I/O signaling.

Technical Context

The ATF1508ASV-15AC100 implements a hierarchical CPLD architecture with eight logic chains, each supporting up to 40-product-term sum-of-products logic via cascade expansion. Its global bus carries all 100 I/O and macrocell feedback signals, feeding switch matrices that allocate up to 40 signals per logic block.

Each of its 128 macrocells integrates five product terms, configurable D/T/latch flip-flops, individual output enable routing, and buried combinatorial or registered feedback. The device supports three global clock inputs (GCLK1–GCLK3), input transition detection (ITD) on clocks and I/O, and fast registered input paths directly from product terms.

Key Specifications

Pinout & Package

ATF1508ASV-15AC100 is packaged in a 100-lead Thin Quad Flat Package (TQFP) with 0.5 mm lead pitch and exposed thermal pad. Pin numbering follows standard counter-clockwise orientation from pin 1 (top-left corner, marked dot).

Key Features

Applications

Equivalent & Alternatives

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

Compared with XCR3128XL-10VQ100C and EPM3128ATC100-10, the ATF1508ASV-15AC100 uniquely combines JTAG boundary-scan, pin-keeper inputs, and dual PD pins in a single 100-TQFP package-enabling field-serviceable, low-noise, and power-aware logic integration without toolchain lock-in.

Availability

ATF1508ASV-15AC100 is available at Aetrix Electronics and suitable for industrial PLC upgrades, legacy system interface bridges, and PCI-compliant peripheral controllers requiring stable component supply across extended product lifecycles.

Supply support for ATF1508ASV-15AC100 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 ATF1508ASV family. The company specializes in secure, reliable microcontrollers, analog, and programmable logic solutions for industrial and automotive markets.

The ATF1508ASV series was designed for high-reliability logic consolidation in cost-sensitive industrial control systems, emphasizing in-system programmability, long-term availability, and robustness against voltage variation and ESD.

FAQ

What is the maximum operating frequency supported by the ATF1508ASV-15AC100?

The ATF1508ASV-15AC100 supports registered operation up to 77 MHz and achieves a maximum clock frequency of 100 MHz under optimal conditions. Its 15 ns pin-to-pin delay and 13 ns minimum global clock period enable reliable timing closure in 66 MHz synchronous systems. These values are measured at VCC = 3.3V, TA = 25°C, and CL = 35 pF, per AC Characteristics Table in Rev. 1408H–PLD–7/05.

Does the ATF1508ASV-15AC100 support in-system programming (ISP)?

Yes, the ATF1508ASV-15AC100 supports full in-system programming via its IEEE 1149.1-compliant 4-pin JTAG interface (TDI, TMS, TCK, TDO). ISP allows configuration bitstream loading without device removal, enabling manufacturing programming, field firmware updates, and design iteration. The JTAG port can be disabled in the design file to reclaim four additional I/O pins when ISP is not required.

How does the power-down feature work on the ATF1508ASV-15AC100?

The ATF1508ASV-15AC100 includes two dedicated power-down pins (PD1 and PD2) that reduce supply current to below 5 mA when asserted high. During power-down, all internal logic states and registered outputs are latched and held, and I/O pins retain their last driven state via pin-keeper circuitry. Input transitions are ignored until PD is deasserted, ensuring deterministic wake-up behavior.

What package type is used for the ATF1508ASV-15AC100?

The ATF1508ASV-15AC100 uses a 100-lead Thin Quad Flat Package (TQFP) with 0.5 mm lead pitch and exposed thermal pad. This RoHS-compliant, green (Pb/halide-free) package is optimized for automated surface-mount assembly and provides 96 bi-directional I/O pins plus four dedicated inputs (GCLK1, GCLK2, GCLR, OE1) in a compact 14 mm × 14 mm footprint.

Is boundary-scan testing supported on the ATF1508ASV-15AC100?

Yes, the ATF1508ASV-15AC100 fully supports IEEE Std. 1149.1-1990 and 1149.1a-1993 boundary-scan testing. Each of its 96 I/O pins and four dedicated inputs has an associated Boundary-Scan Cell (BSC), and BSDL models are available from Microchip's website. The TAP controller resets automatically at power-up, eliminating need for a TRST pin.