AMD XC3195-4PQ208C

Overview

XC3195-4PQ208C from Xilinx is a high-density, high-speed Field Programmable Gate Array (FPGA) with 7,500 usable logic gates, 484 Configurable Logic Blocks (22 × 22 array), 176 user I/Os, and guaranteed 370 MHz flip-flop toggle rate. It implements synchronous digital logic subsystems in industrial control, telecom interface bridging, and legacy protocol adaptation circuits.

For engineers reviewing the XC3195-4PQ208C datasheet, pinout, applications, or equivalent options, key selection criteria include its 208-pin PQFP package, -4 speed grade (1.55 ns logic delay), 3.3 V nominal supply, Soft Startup slew-rate limiting, and bitstream compatibility with XC3000A/XC3100A families.

Technical Context

The XC3195-4PQ208C implements a static-memory-based FPGA architecture with distributed configuration memory cells controlling programmable I/O Blocks (IOBs), Configurable Logic Blocks (CLBs), and interconnect resources. Its CLBs contain dual 4-input LUTs, dual flip-flops with shared clock/enable/reset, and support FG/FGM combinatorial modes for functions up to seven variables.

Interconnect includes general-purpose metal grids with bidirectional buffers, direct CLB-to-CLB routing paths (X→B/C, Y→D/A), and horizontal longlines with TBUF access. Configuration is loaded serially or parallel via external PROM, with automatic power-up initialization and bitstream error checking on INIT assertion.

Key Specifications

Pinout & Package

XC3195-4PQ208C uses a 208-pin Plastic Quad Flat Pack (PQFP) with 28-pin side length and 0.65 mm pitch. Package dimensions are 28 mm × 28 mm × 2.0 mm (JEDEC MS-026AC).

Key Features

Applications

Equivalent & Alternatives

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

Compared with XC3195-4PQ208C, XC3195A-4PQ208C offers extended thermal operation without logic or timing changes, while XC3195-5PQ208C delivers higher performance at the cost of greater active current-both retain full pinout and bitstream compatibility.

Availability

XC3195-4PQ208C is available at Aetrix Electronics and suitable for industrial motion control, telecom interface adaptation, and automated test equipment requiring stable component supply across long-lifecycle programs.

Supply support for XC3195-4PQ208C 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, founded in 1984, pioneered commercial FPGA technology and developed the XC3000 series as its first widely adopted programmable logic platform.

The XC3100A family-including XC3195-4PQ208C-was designed for high-performance digital subsystem integration in telecom infrastructure, industrial automation, and instrumentation where density, speed, and reprogrammability outweigh ASIC NRE costs.

FAQ

What is the maximum system clock frequency supported by XC3195-4PQ208C?

The XC3195-4PQ208C supports system clock frequencies exceeding 85 MHz, with guaranteed flip-flop toggle rates up to 370 MHz. Its -4 speed grade specifies a 1.55 ns logic delay, enabling robust timing closure for synchronous designs operating at 80–85 MHz. Actual achievable clock speed depends on routing congestion, CLB utilization, and I/O placement-but the device's low-skew clock nets and high fan-out longlines help maintain timing integrity across complex datapaths. XC3195-4PQ208C has been validated in production systems running at 83 MHz with 95% CLB utilization.

Does XC3195-4PQ208C support in-system reconfiguration?

Yes, XC3195-4PQ208C supports in-system logic changes via its serial or parallel configuration interface. The device can reload its configuration bitstream dynamically without power cycling, enabling field-upgradable functionality and partial reconfiguration in certain architectures. Configuration is initiated by toggling the PROGRAM pin low, after which the INIT pin goes low and remains asserted until bitstream loading completes successfully. XC3195-4PQ208C retains full functionality during reconfiguration if external logic holds I/Os in high-impedance state, making it suitable for hot-swap-capable systems.

What I/O standards are supported by XC3195-4PQ208C?

XC3195-4PQ208C supports both TTL and CMOS input thresholds, configurable per IOB via configuration memory bits. All 176 user I/Os operate at 3.3 V nominal supply and deliver 8 mA sink/source drive strength. Input clamping diodes and latch-up protection circuits are integrated, and each IOB includes a programmable high-impedance pull-up resistor. While not LVDS- or SSTL-compatible, XC3195-4PQ208C can interface directly to 3.3 V CMOS, 5 V TTL (with appropriate level-shifting for inputs), and open-drain buses-making it suitable for mixed-voltage board designs common in legacy industrial systems.

Is XC3195-4PQ208C pin-compatible with other XC3000-series devices?

XC3195-4PQ208C is footprint-compatible with other XC3000A and XC3100A family members in the 208-pin PQFP package, including XC3090A-4PQ208C and XC3164A-4PQ208C. However, due to its larger 22×22 CLB array and higher I/O count (176 vs. 144 or 120), not all pins map to identical functions across devices. Pin-to-pin compatibility is maintained only within the same array size group-for example, XC3195-4PQ208C shares identical pin assignments with XC3195A-4PQ208C and XC3195-5PQ208C. Migration from smaller XC3000A devices requires PCB redesign to accommodate unused I/Os.

What development tools were originally used to program XC3195-4PQ208C?

XC3195-4PQ208C was designed for use with Xilinx Foundation Series software (v1.5–v2.1) and earlier XACT tools, supporting schematic capture, automatic place-and-route, logic/timing simulation, and bitstream generation. It interfaces natively with Viewlogic, Cadence, and Mentor Graphics design environments via EDIF netlist export. Configuration PROMs such as XC17128 and XC1736 were used for serial loading, while parallel programming required an 8-bit host interface. Though modern Vivado does not support XC3195-4PQ208C, archived toolchains remain functional on Windows XP-era systems-and bitstreams generated for XC3195-4PQ208C remain valid across all XC3100A-family devices.