AMD XC1701SO20C

Overview

XC1701SO20C from AMD is a serial PROM configuration memory device for Xilinx FPGA initialization, featuring 1 Mbit capacity, 5 V supply voltage, and SO-20 package. It supports standard SPI-compatible serial interface and operates across commercial temperature range (0°C to 70°C), used in industrial control logic and legacy FPGA-based communication gateways.

For engineers reviewing the XC1701SO20C datasheet, pinout, applications, or equivalent options, key selection considerations include 1 Mbit density, 5 V VCC compatibility, SO-20 footprint, SPI serial access timing, and FPGA configuration sequence support per Xilinx 4000 series requirements.

Technical Context

This device implements a one-time programmable (OTP) parallel-to-serial shift register architecture optimized for Xilinx XC4000 family FPGA configuration loading. It delivers synchronous serial data output with CS#, CLK, and DI/DO shared-pin operation, supporting both read and program modes via dedicated programming voltage (VPP = 12.5 V).

XC1701SO20C uses NMOS technology with internal address counter and automatic page write sequencing. Configuration data is loaded into the FPGA on power-up or INIT# assertion, with built-in CRC verification disabled by default but supported via external logic.

Key Specifications

Pinout & Package

XC1701SO20C is housed in a 20-pin small-outline (SO-20) plastic package with 300-mil body width and standard 0.050" lead pitch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with XC1701LPC20C and AT17LV010-10JC, XC1701SO20C provides guaranteed 5 V operation and OTP security ideal for fixed-function industrial deployments where configuration integrity is critical and voltage rails are legacy 5 V.

Availability

XC1701SO20C is available at Aetrix Electronics and suitable for industrial PLCs, legacy telecom gateways, and avionics ground support equipment requiring stable component supply and long-lifecycle availability.

Supply support for XC1701SO20C 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

AMD acquired Xilinx in 2022 and now manages legacy Xilinx configuration memory product lines including the XC1700 family.

The XC1700 series was originally designed by Xilinx to provide cost-effective, pin-compatible configuration memory for XC4000 FPGA families in commercial-temperature industrial and communications applications.

FAQ

What is the programming voltage requirement for XC1701SO20C?

XC1701SO20C requires a 12.5 V programming voltage (VPP) applied to Pin 19 during initial device programming. This voltage is not used during normal read operation. The 12.5 V level ensures reliable fuse-link programming and guarantees data retention exceeding 10 years. Always disconnect VPP after programming to avoid overstress during system operation. XC1701SO20C operates at 5 V for all other functions.

Is XC1701SO20C compatible with Xilinx XC4010 FPGAs?

Yes, XC1701SO20C is fully compatible with Xilinx XC4010, XC4013, XC4020, and other XC4000-series FPGAs. Its 1 Mbit capacity matches the bitstream size of these devices, and its timing parameters-including 200 ns access time and synchronous serial interface-meet Xilinx's configuration specification for this family. XC1701SO20C is explicitly listed in Xilinx Application Note XAPP049 for XC4000 configuration support.

Can XC1701SO20C be reprogrammed after initial programming?

No, XC1701SO20C is a one-time programmable (OTP) device. Once programmed, the internal fusible links are permanently altered and cannot be erased or rewritten. This design ensures configuration integrity in mission-critical applications. If field reprogrammability is required, consider alternatives such as AT17LV010-10JC, but note that XC1701SO20C itself does not support multiple programming cycles.

What is the function of the DI/DO pin on XC1701SO20C?

The DI/DO pin (Pin 3) serves as a bidirectional serial data terminal: it accepts configuration data during programming (DI mode) and outputs the stored bitstream during FPGA configuration (DO mode). Its direction is controlled internally by the state of CS# and CLK. During normal operation, DI/DO drives the FPGA's DIN pin synchronously with CCLK, making XC1701SO20C integral to deterministic FPGA startup sequences.

Does XC1701SO20C support JTAG configuration loading?

No, XC1701SO20C does not support JTAG configuration loading. It uses a dedicated 3-wire serial interface (CS#, CLK, DI/DO) aligned with Xilinx's master serial configuration mode. JTAG is handled separately by the FPGA's TDI/TDO pins and requires a different PROM type (e.g., AT17LV010-10JC). XC1701SO20C is designed exclusively for non-JTAG, power-up-initiated configuration of XC4000 FPGAs.