Microchip Technology AT18F010-30XU

Overview

AT18F010-30XU from Atmel is a 1-Mbit JTAG in-system programmable configuration PROM designed to store and serially deliver FPGA configuration bitstreams. It operates at 3.3V VCCINT, supports 1.8V/2.5V/3.3V I/O levels, delivers up to 33 MHz serial download speed, and features IEEE 1532-compliant ISP via JTAG for Xilinx Spartan® and Virtex® FPGAs in industrial temperature range (–40°C to +85°C).

For engineers reviewing the AT18F010-30XU datasheet, AT18F010-30XU pinout, AT18F010-30XU application, or AT18F010-30XU equivalent, this device serves as a low-cost, pin-compatible replacement for Xilinx XCFxxS PROMs and provides verified cascading support, boundary-scan testability (IEEE 1149.1), and dual-mode FPGA interface (master/slave serial) with configurable I/O supply voltages.

Technical Context

The AT18F010-30XU implements a serial flash memory architecture with dedicated JTAG TAP controller for IEEE 1532 programming and IEEE 1149.1 boundary-scan testing. Its internal oscillator and power-on reset circuitry enable autonomous configuration startup without external timing control.

It supports two distinct FPGA interface modes: master serial (FPGA drives CLK and controls timing) and slave serial (AT18F010-30XU accepts external CLK on its CLK pin). The CEO output enables daisy-chained cascading across multiple devices, while CF provides JTAG-triggered configuration pulse initiation without FPGA power cycle.

Key Specifications

Pinout & Package

AT18F010-30XU is housed in a 20-lead TSSOP (20A2 package), 4.4 mm × 6.5 mm body, 0.65 mm pitch, RoHS-compliant and halide-free.

Key Features

Applications

Equivalent & Alternatives

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

Compared with XCF01S and AT17LV010A, AT18F010-30XU uniquely combines JTAG ISP, cascading CEO, dual-voltage I/O, and boundary-scan testability in a single industrial-grade package-making it optimal for upgradable, testable, and multi-FPGA embedded systems.

Availability

AT18F010-30XU is available at Aetrix Electronics and suitable for industrial automation, telecom infrastructure, and FPGA-based prototyping platforms requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for AT18F010-30XU 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

Atmel Corporation (now part of Microchip Technology) is a semiconductor manufacturer specializing in microcontrollers, nonvolatile memory, and programmable logic solutions for industrial, automotive, and communications markets.

The AT18F series was designed specifically as JTAG-configurable, cascading flash PROMs for Xilinx and Atmel FPGA platforms-emphasizing in-system programmability, testability, and seamless integration into high-reliability embedded systems.

FAQ

What is the primary function of the AT18F010-30XU in an FPGA-based system?

The AT18F010-30XU serves as a serial configuration PROM that stores and delivers the bitstream required to initialize Xilinx Spartan® and Virtex® FPGAs. It supports both master serial (FPGA-driven) and slave serial (externally clocked) modes, enabling flexible integration across FPGA families. Its IEEE 1532 JTAG interface allows in-system programming, and the CEO pin enables daisy-chained configurations-making AT18F010-30XU essential for reliable, upgradable FPGA boot architectures.

Does the AT18F010-30XU support multiple I/O voltage levels, and how is this implemented?

Yes, the AT18F010-30XU supports 1.8 V, 2.5 V, and 3.3 V I/O operation through separate supply rails: VCCO powers the DATA, RESET/OE, CE, CF, and CEO pins, while VCCJ independently supplies the TMS, TCK, TDI, and TDO JTAG pins. This separation allows interfacing with mixed-voltage FPGA designs-for example, a 1.8 V FPGA I/O bank and 3.3 V JTAG test equipment-without external level shifters. The AT18F010-30XU datasheet specifies absolute min/max limits for each rail to ensure robust operation.

How does the CEO pin function in a daisy-chained configuration using multiple AT18F010-30XU devices?

The CEO (Chip Enable Output) pin of the AT18F010-30XU goes Low when the internal address counter reaches its maximum value-indicating that all 1 Mbit of configuration data has been clocked out. In a daisy chain, this CEO signal connects directly to the CE (Chip Enable) input of the next AT18F device, automatically enabling it to begin streaming its own bitstream. This eliminates external control logic and ensures deterministic, synchronous handoff between devices-critical for multi-FPGA systems like radar beamformers or high-speed protocol analyzers using AT18F010-30XU.

Can the AT18F010-30XU be programmed in-system, and what standards does it comply with?

Yes, the AT18F010-30XU supports full in-system programming (ISP) via its four-wire JTAG interface, compliant with IEEE Standard 1532. It also implements IEEE 1149.1 boundary-scan testability using a BSDL model, enabling structural verification of PCB interconnects before configuration. Programming can be performed using Atmel's JCPS software with SVF file generation-or third-party programmers such as Data I/O or Hi-Lo. This ISP capability allows field firmware updates and eliminates the need for socketed programming, making AT18F010-30XU ideal for deployed industrial systems.

What is the role of the CF (Configuration Pulse) pin on the AT18F010-30XU, and how is it triggered?

The CF pin is an open-drain output that pulses Low in response to the JTAG CONFIG instruction-allowing FPGA reconfiguration without cycling power or resetting the entire system. It is triggered exclusively via the JTAG TAP controller when the CONFIG instruction is executed; no external signal or timing constraint is required. This feature is especially valuable in mission-critical applications like telecom base stations or medical imaging controllers using AT18F010-30XU, where uninterrupted operation must be maintained during partial or full reconfiguration events.