Microchip Technology AT18F002-30XU

Overview

AT18F002-30XU from Atmel is a 2-Mbit JTAG In-System Programmable (ISP) configuration PROM designed to store and serially load bitstream data into FPGAs including Xilinx Virtex-II, Spartan-3, and Virtex-II Pro families. It operates with 3.3V internal supply (VCCINT), supports 1.8V/2.5V/3.3V I/O (VCCO), delivers up to 33 MHz configuration clock speed, and features IEEE 1532 ISP and IEEE 1149.1 boundary-scan testability in a 20-lead TSSOP package.

For engineers reviewing the AT18F002-30XU datasheet, AT18F002-30XU pinout, AT18F002-30XU application, or AT18F002-30XU equivalent, key selection criteria include JTAG ISP compatibility, cascading CEO support for multi-FPGA systems, low-power standby current (<1 mA), open-collector DATA output with 20 kΩ pull-up, and functional equivalence to Xilinx XCFxxS series PROMs for Spartan/Virtex configuration.

Technical Context

The AT18F002-30XU implements a serial flash-based configuration memory architecture with dedicated download interface logic that directly drives FPGA configuration pins (CLK, RESET/OE, CE, CF). Its internal address counter and tri-state control logic enable master-serial and slave-serial FPGA boot modes without external controllers.

JTAG compliance includes full IEEE 1532 programming algorithm support and IEEE 1149.1 boundary-scan testing via TCK/TMS/TDI/TDO pins, with automatic power-on TAP reset and BSDL-defined scan cells on all I/Os. The device uses a low-power CMOS FLASH process and supports daisy-chained configuration via CEO-to-CE interconnection.

Key Specifications

Pinout & Package

AT18F002-30XU is housed in a RoHS-compliant 20-lead Thin Shrink Small Outline Package (TSSOP), designated 20A2 per JEDEC MO-153 AC. The package features 0.65 mm lead pitch, 4.4 mm width, and 6.5 mm length, optimized for high-density FPGA carrier boards.

Key Features

Applications

Equivalent & Alternatives

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

Compared with XCF02S and AT17F002, AT18F002-30XU uniquely combines Xilinx FPGA compatibility, CEO daisy-chaining, CF-triggered reconfiguration, and IEEE 1532 ISP - making it the only option supporting both multi-FPGA scalability and field-upgradable bitstream loading without hardware changes.

Availability

AT18F002-30XU is available at Aetrix Electronics and suitable for industrial automation, embedded vision, aerospace avionics, and communications infrastructure requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for AT18F002-30XU 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 devices for industrial, automotive, and consumer applications.

The AT18F series was developed specifically to provide cost-effective, JTAG-programmable configuration memory for SRAM-based FPGAs - addressing the need for field-upgradable, cascaded, and low-power boot solutions in space-constrained systems.

FAQ

What is the maximum configuration clock frequency supported by AT18F002-30XU?

The AT18F002-30XU supports a maximum configuration clock frequency of 33 MHz, corresponding to a minimum clock period of 30 ns. This timing is validated across the industrial temperature range (−40°C to +85°C) and enables fast FPGA initialization. The device meets all AC timing parameters including TCAC (CLK to Data Delay ≤15 ns) and TOH (Data Hold ≥15 ns) under these conditions. AT18F002-30XU achieves this performance using a low-power CMOS FLASH process with optimized internal address counter logic.

Does AT18F002-30XU support cascading with other configuration PROMs?

Yes, AT18F002-30XU supports hardware cascading via its CEO (Chip Enable Output) pin (Pin 13), which goes low when the internal address counter reaches its maximum value. In a daisy-chain configuration, the CEO of one AT18F002-30XU must connect to the CE input of the next device. This allows sequential configuration of multiple FPGAs or higher-density FPGAs using a single JTAG chain. The AC timing parameter TOCK (CLK to CEO Delay ≤20 ns) ensures deterministic handoff between devices.

Can AT18F002-30XU configure both Xilinx and Atmel FPGAs?

Yes, AT18F002-30XU is functionally compatible with Xilinx Spartan-3, Virtex-II, Virtex-II Pro, and Virtex-4 FPGAs as documented in Table 4-1 of the datasheet, and also supports Atmel AT40KAL series FPGAs. Its pin compatibility with Xilinx XCFxxS PROMs and native support for Xilinx master/slave serial configuration protocols enable drop-in replacement in existing Xilinx designs. For Atmel FPGAs, it maintains backward compatibility with the AT17 series while adding IEEE 1532 ISP and CEO cascade features.

What are the supply voltage requirements for AT18F002-30XU?

AT18F002-30XU requires three independent supply rails: VCCINT (3.0–3.6 V, typ. 3.3 V) for internal logic, VCCO (1.7–3.6 V) for I/O drivers (supporting 1.8V/2.5V/3.3V FPGA interfaces), and VCCJ (1.7–3.6 V) for JTAG I/O drivers. Each rail must be decoupled with local 0.1 µF ceramic capacitors. The device draws ≤10 mA active current per supply and <1 mA in CE-high standby mode, as specified in DC Characteristics Table 11.

Is AT18F002-30XU RoHS compliant and what package does it use?

Yes, AT18F002-30XU is RoHS compliant, halide-free, and lead-free, meeting green packaging requirements. It is supplied exclusively in a 20-lead TSSOP package (designated 20A2 per JEDEC MO-153 AC), measuring 4.4 mm × 6.5 mm with 0.65 mm lead pitch. The package includes exposed pad thermal considerations and conforms to moisture sensitivity level (MSL) 3 per J-STD-020, requiring bake before reflow if exposed beyond floor life.