AMD XC4028XL-3BG256I

Overview

XC4028XL-3BG256I from Xilinx is a Field-Programmable Gate Array (FPGA) with 2,800 usable logic gates, 256-pin Ball Grid Array (BGA) package, -3 speed grade (3.3 ns CLB propagation delay), and commercial temperature range operation. It serves as a reconfigurable digital logic fabric in embedded control and interface bridging applications.

For engineers reviewing the XC4028XL-3BG256I datasheet, pinout, applications, or equivalent options, key selection factors include logic capacity, I/O count (192 user I/Os), speed grade timing compliance, and legacy 3.3 V LVTTL interface support.

Technical Context

The XC4028XL-3BG256I implements a hierarchical architecture with Configurable Logic Blocks (CLBs), Input/Output Blocks (IOBs), and interconnect resources. It supports SRAM-based configuration via JTAG or serial PROM, and operates at 3.3 V with LVTTL-compatible I/O standards.

It features dedicated carry logic for high-speed arithmetic, distributed RAM capability per CLB (16 bits), and programmable slew-rate control on output drivers. Configuration bitstream integrity is maintained through internal CRC checking during power-up.

Key Specifications

Pinout & Package

XC4028XL-3BG256I uses a 256-ball fine-pitch BGA (FBGA) package with 1.27 mm ball pitch and standard 16×16 array layout. Thermal and mechanical data comply with JEDEC MO-205AB.

Key Features

Applications

Equivalent & Alternatives

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

Compared with XC4028XL-3BG256I, XC4025XL-3PQ208C trades I/O count and density for surface-mount ease, while XC4036XL-3BG256I extends logic capacity within the same mechanical and thermal envelope-enabling scalable design reuse without PCB revision.

Availability

XC4028XL-3BG256I is available at Aetrix Electronics and suitable for industrial motion controllers, legacy bus interface bridges, and automotive diagnostic tools requiring stable component supply across extended product lifecycles.

Supply support for XC4028XL-3BG256I 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 applications requiring reconfigurable logic with guaranteed timing performance and industrial temperature support.

FAQ

What is the maximum operating frequency supported by XC4028XL-3BG256I?

The XC4028XL-3BG256I has a -3 speed grade specifying a 3.3 ns CLB propagation delay. Maximum system clock frequency depends on design topology, but synchronous paths can achieve up to 125 MHz in typical register-to-register configurations. The actual achievable frequency must be verified per design using Xilinx Foundation or Alliance software timing analysis.

Does XC4028XL-3BG256I support in-system programming?

Yes, XC4028XL-3BG256I supports in-system programming via its IEEE 1149.1 JTAG interface (TMS, TDI, TDO, TCK). This allows configuration bitstream updates without removing the device from the PCB, provided the JTAG chain is accessible and compliant with boundary-scan requirements.

What configuration modes are available for XC4028XL-3BG256I?

XC4028XL-3BG256I supports Master Serial (using external PROM), Slave Parallel (driven by a microprocessor), and JTAG modes. Each mode uses distinct pin assignments and initialization sequences, and mode selection is determined by hardware strapping or dedicated mode pins during power-up.

Is XC4028XL-3BG256I RoHS compliant?

XC4028XL-3BG256I is not RoHS compliant. It belongs to the legacy XC4000XL family manufactured prior to EU RoHS Directive enforcement and contains leaded solder in its BGA interconnect structure. For RoHS-compliant alternatives, consult AMD/Xilinx's Spartan or Artix families.

Can XC4028XL-3BG256I operate with 5 V-tolerant I/Os?

No, XC4028XL-3BG256I uses 3.3 V LVTTL I/O standards and is not 5 V-tolerant. Direct connection to 5 V logic requires external level-shifting circuitry. Its IOBs are specified for 3.3 V operation only, and exceeding VCCO + 0.5 V may cause permanent damage.