AMD XC4085XLA-08HQ160I

Overview

XC4085XLA-08HQ160I from Xilinx is a high-capacity, 3.3 V Field-Programmable Gate Array (FPGA) featuring 7,448 logic cells, 85,000 usable gates, 100,352 RAM bits, and 448 user I/Os in a 160-pin HQFP package. It implements synchronous edge-triggered and dual-port RAM per CLB, supports up to 80 MHz system clock rates, and includes eight global low-skew clock networks - deployed in PCI-compliant embedded control and high-speed data acquisition systems.

For engineers reviewing the XC4085XLA-08HQ160I datasheet, pinout, applications, or equivalent options, key selection criteria include confirmed CLB count (3,136), I/O count (448), 0.35 µm SRAM process node, -08 speed grade timing, and HQ160 package thermal/mechanical footprint compatibility with legacy XC4000X designs.

Technical Context

The XC4085XLA-08HQ160I belongs to the XC4000XLA family - a low-voltage, high-performance variant of the XC4000X series built on 0.35 µm SRAM technology. It features configurable CLBs with three function generators (F/G/H), dual-edge-triggered flip-flops or latches per CLB, and dedicated carry logic enabling >150 MHz internal performance.

Its IOBs support 5 V-tolerant inputs, programmable slew rate, individual pull-up/pull-down resistors, and IOB-level clock enable. The device uses master/slave serial or parallel configuration modes, with 22-bit addressing in Master Parallel mode and soft start-up to suppress ground bounce during power-on initialization.

Key Specifications

Pinout & Package

XC4085XLA-08HQ160I is housed in a 160-pin Heat Sink Quad Flat Package (HQFP), measuring 24 mm × 24 mm with 0.5 mm lead pitch. This thermally enhanced package supports industrial temperature operation (-40°C to +100°C) and provides symmetric I/O distribution around all four edges.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar FPGA-based logic implementation applications.

Compared with XC4085XL-08HQ160C, XC4085XLA-08HQ160I delivers guaranteed industrial temperature operation and tighter timing margins; versus XCV1000E-8HQ240I, it offers drop-in replacement capability for legacy boards but lacks advanced IP integration and higher-speed I/O standards.

Availability

XC4085XLA-08HQ160I is available at Aetrix Electronics and suitable for industrial motion control, medical imaging subsystems, and avionics data acquisition requiring stable component supply over extended product lifecycles.

Supply support for XC4085XLA-08HQ160I 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

Xilinx, now part of AMD, pioneered commercial FPGA technology and developed the XC4000 family as the first widely adopted SRAM-based programmable logic platform.

The XC4000XLA product line was engineered for high-reliability 3.3 V embedded systems requiring PCI compliance, deterministic timing, and long-term obsolescence management - targeting aerospace, medical, and industrial control markets.

FAQ

What is the maximum system clock frequency supported by XC4085XLA-08HQ160I?

The XC4085XLA-08HQ160I is rated for synchronous system clock operation up to 80 MHz, as validated by its -08 speed grade specification. This rating assumes proper PCB layout, decoupling, and 3.3 V ±5% supply regulation. Internal logic paths can exceed 150 MHz under optimized conditions, but system-level timing closure must respect the 80 MHz constraint for guaranteed functionality across temperature and voltage corners.

Does XC4085XLA-08HQ160I support JTAG boundary scan testing?

Yes, XC4085XLA-08HQ160I includes IEEE 1149.1-compliant boundary scan logic with TCK, TMS, TDI, and TDO pins. This enables in-circuit testing, device programming, and interconnect verification without physical probe access. The boundary scan chain covers all user I/Os and internal configuration logic, and is fully supported by Xilinx IMPACT and third-party JTAG tools.

Can XC4085XLA-08HQ160I be configured using a serial PROM?

Yes, XC4085XLA-08HQ160I supports master serial configuration mode, where an external serial PROM (e.g., Xilinx XC18V02) drives the DIN pin under control of the CCLK signal. Configuration occurs automatically on power-up when the MODE pins are set to 000. The device accepts standard Xilinx bitstream formats and verifies integrity via internal CRC checking before releasing the DONE signal.

Is XC4085XLA-08HQ160I pin-compatible with earlier XC4000 series FPGAs?

XC4085XLA-08HQ160I is pinout-compatible with XC4085XL-08HQ160I and other XC4000X family members of equivalent array size, but not with XC4000 or XC4000E devices. While physical pin locations match, differences in configuration protocols, voltage tolerances, and internal routing require updated bitstreams and may necessitate minor I/O buffer adjustments in legacy designs.

What type of on-chip memory does XC4085XLA-08HQ160I provide?

XC4085XLA-08HQ160I provides distributed Select-RAM memory across its 3,136 CLBs - totaling 100,352 bits. Each CLB supports configurable RAM modes: 16x2 single-port, 32x1 single-port, or 16x1 dual-port with synchronous (edge-triggered) write. Read access time equals CLB logic delay; write access adds one clock cycle latency. No dedicated block RAM is present - all memory is function-generator-based.