AMD XC4028XL-3HQ304I

Overview

XC4028XL-3HQ304I from Xilinx is a Field-Programmable Gate Array (FPGA) with 2,800 usable logic cells, 3.0 ns gate delay, and a 304-pin plastic quad flat pack (PQFP) package. It implements synchronous digital logic in embedded control, protocol bridging, and real-time signal conditioning applications.

For engineers reviewing the XC4028XL-3HQ304I datasheet, pinout, applications, or equivalent options, key selection criteria include logic cell count, speed grade (-3), I/O count (224 user I/Os), and PQFP thermal and routing constraints.

Technical Context

The XC4028XL-3HQ304I belongs to the Xilinx XC4000XL family, built on a 0.35 µm CMOS process. It supports SRAM-based configuration with internal 4-input LUTs, dedicated carry logic, and configurable I/O blocks supporting TTL, CMOS, and LVTTL signaling.

Configuration occurs via JTAG boundary-scan (IEEE 1149.1) or master serial mode using an external PROM. The device includes global clock buffers and three dedicated clock inputs with programmable inversion and gating.

Key Specifications

Pinout & Package

HQ304 is a 304-pin plastic quad flat pack (PQFP) with 76 pins per side, 0.8 mm lead pitch, and exposed thermal pad not electrically connected. Pin numbering follows standard counter-clockwise convention starting from top-left corner.

Key Features

Applications

Equivalent & Alternatives

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

Compared with XC4028XL-3HQ304I, the -2 variant improves timing margin at no area cost, while the XC4036XL-3HQ304I increases logic capacity within identical thermal and mechanical constraints-both retain full pin compatibility and configuration file format compatibility.

Availability

XC4028XL-3HQ304I is available at Aetrix Electronics and suitable for industrial motion control, medical imaging interface, avionics data concentration, and automated test equipment requiring stable component supply and long-term obsolescence management.

Supply support for XC4028XL-3HQ304I 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 delivers programmable logic solutions for aerospace, industrial, and communications markets.

The XC4000XL family was designed for cost-sensitive, low-power embedded logic replacement with non-volatile configuration alternatives and robust I/O flexibility.

FAQ

What is the maximum operating frequency supported by the XC4028XL-3HQ304I?

The XC4028XL-3HQ304I has a -3 speed grade specifying a 3.0 ns maximum combinational delay. Achievable system clock frequencies depend on design topology, but synchronous logic paths commonly operate up to 125 MHz. The device includes three dedicated global clock inputs with low-skew routing to all logic resources, enabling reliable timing closure in XC4028XL-3HQ304I-based systems.

Does the XC4028XL-3HQ304I support in-system programming?

Yes, the XC4028XL-3HQ304I supports in-system programming via its IEEE 1149.1 JTAG TAP controller. Configuration bitstream can be loaded through TDI/TDO using standard boundary-scan tools. It also supports master serial mode using an external PROM, allowing field updates without removing XC4028XL-3HQ304I from the board.

What I/O standards are compatible with the XC4028XL-3HQ304I?

The XC4028XL-3HQ304I I/O blocks support LVTTL, TTL, and CMOS signaling standards. Each I/O pin is individually configurable for drive strength (4 mA or 8 mA), slew rate (fast or slow), and pull-up/pull-down resistors. Some I/O banks tolerate 5 V inputs while operating at 3.3 V VCCO, enabling legacy interface compatibility in XC4028XL-3HQ304I designs.

Is the XC4028XL-3HQ304I pin-compatible with other XC4000XL devices in HQ304 packaging?

Yes, all XC4000XL family members in the HQ304 package-including XC4013XL, XC4020XL, XC4028XL, and XC4036XL-share identical pinouts and I/O banking structure. This allows direct substitution based on logic density requirements without PCB modification, provided power delivery and thermal design accommodate the specific XC4028XL-3HQ304I variant's current draw.

What configuration memory options work with the XC4028XL-3HQ304I?

The XC4028XL-3HQ304I requires external configuration memory. Compatible options include Xilinx XC18V00 series PROMs (e.g., XC18V02), third-party SPI or parallel EEPROMs, and microcontroller-driven serial loading. Configuration occurs on power-up in master serial mode or via JTAG for debugging and reprogramming. No internal non-volatile storage exists in XC4028XL-3HQ304I.