Microchip Technology ATF1508AS-7QC160

Overview

ATF1508AS-7QC160 from Microchip Technology (formerly Atmel) is a high-density, electrically-erasable Complex Programmable Logic Device (CPLD) with 128 macrocells, 5 product terms per macrocell expandable to 40, 7.5 ns pin-to-pin delay, and registered operation up to 125 MHz. It supports 3.3 V or 5.0 V I/O, JTAG boundary-scan (IEEE 1149.1), and in-system programmability - used in PCI-compliant interface logic, legacy TTL replacement, and industrial control state machines.

For engineers reviewing the ATF1508AS-7QC160 datasheet, ATF1508AS-7QC160 pinout, ATF1508AS-7QC160 application, or ATF1508AS-7QC160 equivalent, key selection criteria include its 160-pin PQFP package, dual VCCINT/VCCIO power domains, programmable slew rate, pin-keeper inputs, and support for power-down via PD1/PD2 pins.

Technical Context

The ATF1508AS-7QC160 implements a hierarchical CPLD architecture with eight logic chains, each supporting up to 40-product-term sum-of-products logic via cascade paths. Its global bus carries all 100+ input/I/O signals plus buried macrocell feedback, feeding switch matrices that allocate up to 40 signals per logic block.

Each of its 128 macrocells integrates OR/XOR/cascade logic, a configurable D/T/latch flip-flop with individual clock enable and asynchronous reset/preset, output enable multiplexer, and programmable open-collector output. ITD (Input Transition Detection) circuits are present on global clocks, inputs, and I/Os, and three dedicated global clock pins (GCLK1–GCLK3) support synchronous design.

Key Specifications

Pinout & Package

ATF1508AS-7QC160 is housed in a 160-lead Plastic Quad Flat Package (PQFP) with 0.5 mm pitch, body size 28 × 28 mm, and JEDEC MS-026 compliant footprint. Pin functions are validated per Atmel doc 0784P–PLD–7/05.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ATF1508AS-10QC160, the ATF1508AS-7QC160 delivers 25% faster timing for high-speed control loops; compared with XC95144XL-10TQ144I, it retains 5 V tolerance, PCI compliance, and Atmel's mature ISP ecosystem - critical for industrial retrofits and mixed-voltage designs.

Availability

ATF1508AS-7QC160 is available at Aetrix Electronics and suitable for PCI interface logic, industrial motion control, legacy system emulation, and automated test equipment requiring stable component supply across extended lifecycle programs.

Supply support for ATF1508AS-7QC160 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 ATF1508AS family, including datasheets, BSDL models, and legacy programming tools.

The ATF1508AS series was designed for high-reliability, in-system programmable glue logic in industrial, automotive, and communications infrastructure - emphasizing PCI compliance, mixed-voltage I/O, and long-term data retention.

FAQ

What is the maximum operating frequency of the ATF1508AS-7QC160?

The ATF1508AS-7QC160 supports registered operation up to 125 MHz, verified by its 7.5 ns maximum pin-to-pin delay specification under commercial conditions. This frequency applies to synchronous logic paths using global clocks (GCLK1–GCLK3); actual system frequency depends on design complexity, routing, and timing constraints applied during fitting. The ATF1508AS-7QC160 achieves this performance while maintaining full JTAG boundary-scan and in-system programmability.

Does the ATF1508AS-7QC160 support both 3.3 V and 5.0 V I/O interfaces simultaneously?

Yes, the ATF1508AS-7QC160 supports mixed-voltage operation via separate VCCIO and VCCINT supplies: VCCINT must be 5.0 V (±5%), powering core logic and input buffers compatible with both 3.3 V and 5.0 V inputs, while VCCIO can be independently set to either 3.3 V (2.7–3.6 V) or 5.0 V (4.75–5.25 V) to configure output drive strength and voltage thresholds - enabling direct interfacing with 3.3 V and 5.0 V subsystems on the same PCB without level shifters.

How does the power-down mode function on the ATF1508AS-7QC160?

The ATF1508AS-7QC160 implements pin-controlled power-down using PD1 and/or PD2 inputs: when asserted high, device supply current drops below 10 mA, all internal logic states and registered outputs are latched and held, and inputs (except PD pins) are blocked. Outputs retain their last valid state or high-Z condition. The power-down feature is enabled in the design source file; once active, the PD pin cannot serve as a logic I/O but may still contribute buried logic resources. Recovery occurs within 1 µs after PD goes low.

Is the ATF1508AS-7QC160 compatible with PCI bus specifications?

Yes, the ATF1508AS-7QC160 is fully PCI-compliant per PCI Local Bus Specification Rev. 2.2: it meets DC requirements including VOL ≤ 0.55 V at 3 mA sink and VOH ≥ 2.4 V at 2 mA source, and AC requirements including ±44 mA high-current switching drive, 0.5–3.0 V/ns slew rate control, and robust clamp current handling. Its 5.0 V I/O capability, high-drive outputs, and noise-immune routing make it suitable for direct integration into PCI add-in cards and host bridge logic.

Can the ATF1508AS-7QC160 be programmed in-system without removing it from the PCB?

Yes, the ATF1508AS-7QC160 supports full in-system programmability (ISP) via its 4-pin JTAG interface (TCK, TMS, TDI, TDO) compliant with IEEE Std. 1149.1. Programming is performed using 5 V TTL-level signals; SVF files generated by Atmel ISP software enable compatibility with automated test equipment. The JTAG port can be disabled in final configuration to reclaim four additional I/O pins, though doing so forfeits ISP and boundary-scan capabilities for that unit.