Microchip Technology AT18F080-30XU

Overview

AT18F080-30XU from Microchip Technology (formerly Atmel) is a 7,340,032 × 1-bit JTAG In-System Programmable configuration PROM designed to store and serially deliver FPGA bitstreams. It operates with 3.3V internal supply (VCCINT), supports 1.8V/2.5V/3.3V I/O (VCCO/VCCJ), delivers up to 33 MHz configuration clock speed, and features IEEE 1532 ISP and IEEE 1149.1 boundary-scan testability for Xilinx Virtex-4/LX, Virtex-5/LX, and Spartan-3/3E FPGAs.

For engineers reviewing the AT18F080-30XU datasheet, AT18F080-30XU pinout, AT18F080-30XU application, or AT18F080-30XU equivalent, key selection criteria include cascading CEO support, open-collector DATA with 20 kΩ pull-up, RESET/OE dual-function control, TSSOP-20 package compatibility with XCFxxS series, and industrial temperature range (-40°C to +85°C) operation.

Technical Context

The AT18F080-30XU implements a serial flash memory architecture with dedicated download interface logic that directly drives FPGA configuration pins (CLK, CE, RESET/OE) without external controllers. Its JTAG TAP controller supports IEEE 1532 programming and IEEE 1149.1 boundary-scan via TCK/TMS/TDI/TDO, with internal 50 kΩ pull-ups on JTAG inputs and automatic power-on reset.

Configuration sequencing is managed by internal address and bit counters synchronized to CLK; CEO asserts low upon completion of full memory readout to enable daisy-chained configurator cascading. The device supports master-serial and slave-serial FPGA modes, with CF providing JTAG-triggered FPGA reconfiguration without power cycle.

Key Specifications

Pinout & Package

AT18F080-30XU is housed in a 20-lead Thin Shrink Small Outline Package (TSSOP-20, JEDEC MO-153 AC variant), measuring 4.4 × 6.5 mm with 0.65 mm lead pitch and 1.04 mm max height. The package includes exposed pad-free construction, 100% matte tin lead finish, and is compatible with standard reflow profiles (peak 260°C).

Key Features

Applications

Equivalent & Alternatives

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

Compared with XCF08PVO20C, AT18F080-30XU provides JTAG ISP, multi-voltage I/O, and lower standby current but requires BSDL-aware test infrastructure; versus MT47H64M16HR-25E, it delivers nonvolatile, controller-less boot configuration - eliminating FPGA initialization latency and external memory management overhead.

Availability

AT18F080-30XU is available at Aetrix Electronics and suitable for FPGA configuration, industrial programmable logic systems, and telecom infrastructure requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for AT18F080-30XU 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

Microchip Technology acquired Atmel in 2016 and maintains full product support, documentation, and manufacturing continuity for the AT18F series.

The AT18F series was originally developed by Atmel as a family of JTAG-programmable configuration PROMs targeting cost-sensitive, high-reliability FPGA boot applications across industrial, communications, and test equipment markets.

FAQ

What is the maximum configuration clock frequency supported by the AT18F080-30XU?

The AT18F080-30XU supports a maximum configuration clock frequency of 33 MHz, corresponding to a minimum clock period (TCYC) of 30 ns. This timing is validated across the full industrial temperature range (-40°C to +85°C) and ensures reliable bitstream delivery to Xilinx Virtex-4, Virtex-5, and Spartan-3E FPGAs. The AT18F080-30XU achieves this performance using a low-power CMOS flash process with optimized internal address counter logic.

Does the AT18F080-30XU support in-system programming via JTAG?

Yes, the AT18F080-30XU fully supports IEEE 1532-compliant in-system programming (ISP) through its four-wire JTAG interface (TCK, TMS, TDI, TDO). This enables field updates, rapid design iterations, and ATE-based programming without device removal. The AT18F080-30XU includes boundary-scan testability per IEEE 1149.1 and uses internal 50 kΩ pull-ups on all JTAG inputs to ensure robust signal integrity during ISP operations.

How does the CEO pin function in daisy-chained AT18F080-30XU configurations?

The CEO (Chip Enable Output) pin of the AT18F080-30XU goes low when the internal address counter reaches its maximum value - signaling completion of the full 7 Mbit configuration data transfer. In daisy-chain setups, CEO of the first AT18F080-30XU connects to CE of the second unit, enabling automatic handoff. The AT18F080-30XU holds CEO low as long as CE is low and RESET/OE is high, ensuring seamless multi-device configuration without external logic.

Is the AT18F080-30XU pin-compatible with Xilinx XCFxxS series PROMs?

Yes, the AT18F080-30XU is explicitly designed to be pin-compatible with Xilinx XCF08P and XCF16P PROMs in the XCFxxS series. It shares identical 20-lead TSSOP (20A2) packaging, matching pin assignments for DATA, CLK, CE, RESET/OE, CEO, and JTAG signals. This compatibility enables drop-in replacement in Spartan and Virtex FPGA designs without PCB modification, as confirmed in Atmel's compatibility matrix for XC3S50 through XC5VLX30 devices.

What are the supply voltage requirements for VCCO and VCCJ on the AT18F080-30XU?

The AT18F080-30XU supports independent 1.8 V, 2.5 V, or 3.3 V operation on VCCO (I/O drivers) and VCCJ (JTAG drivers), with valid ranges of 1.7–1.9 V, 2.3–2.7 V, and 3.0–3.6 V respectively. VCCINT is fixed at 3.3 V (3.0–3.6 V). This multi-rail flexibility allows the AT18F080-30XU to interface directly with FPGA banks operating at different I/O voltages while maintaining JTAG isolation - a key requirement in mixed-voltage system designs.