Microchip Technology AT49F512-55VU

Overview

AT49F512-55VU from Atmel is a 512 Kbit (64K × 8) single-voltage, in-system programmable Flash memory IC with 55 ns read access time, 10 µs/byte programming, 10-second chip erase, and an 8K-byte boot block with hardware lockout. It operates at 5 V ±10% over the industrial temperature range (−40°C to +85°C) and is used in embedded microcontroller boot code storage and firmware update applications.

For engineers reviewing the AT49F512-55VU datasheet, AT49F512-55VU pinout, AT49F512-55VU application, or AT49F512-55VU equivalent, key selection criteria include its 55 ns read timing, byte-level reprogrammability without high-voltage support, boot sector write protection, DATA polling/Toggle Bit end-of-cycle detection, and VSOP-32 (8 × 14 mm) green packaging.

Technical Context

The AT49F512-55VU implements a standard parallel Flash interface with CE/OE/WE control logic and EPROM-like read behavior. Its internal command register supports software-controlled chip erase, byte programming, boot block lockout, and product identification via six-byte command sequences written to specific address/data locations (e.g., 5555H/AAH, 2AAAH/55H).

It features dual hardware data protection: VCC sense (program inhibited below 3.8 V) and noise filtering (≤15 ns pulses on WE/CE ignored). Erase and program cycles are fully self-timed; no external clocks or timing control signals are required beyond standard bus strobes.

Key Specifications

Pinout & Package

AT49F512-55VU is packaged in a 32-lead Very Small Outline Package (VSOP), 8 mm × 14 mm body, JEDEC MO-142 compliant (Variation BA), with gull-wing leads and pin 1 identifier marked.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SST39VF512-55-4C-NHE and MX29LV512CTTI-55G, the AT49F512-55VU uniquely delivers 5 V-only operation with integrated hardware boot block lockout - eliminating external protection logic and simplifying compliance in legacy 5 V designs.

Availability

AT49F512-55VU is available at Aetrix Electronics and suitable for industrial PLC firmware storage, medical device bootloader, automotive body control module, and network router configuration storage requiring stable component supply and long-lifecycle support.

Supply support for AT49F512-55VU 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 U.S.-based semiconductor company specializing in microcontrollers, nonvolatile memory, and secure authentication ICs.

The AT49F512 belongs to Atmel's parallel Flash memory product line, designed specifically for 5 V embedded systems needing in-system reprogrammability, deterministic erase times, and hardware-enforced boot code protection.

FAQ

What is the operating temperature range for the AT49F512-55VU?

The AT49F512-55VU is rated for industrial operation from −40°C to +85°C. This range is validated per the datasheet's DC and AC operating specifications and applies to all guaranteed parameters including 55 ns read access, 10 µs byte programming, and 100 µA standby current. The VSOP package's thermal characteristics support reliable performance across this full range without derating.

Does the AT49F512-55VU require high-voltage programming signals?

No, the AT49F512-55VU does not require high-voltage programming signals. It operates exclusively at 5 V ±10% for both read and reprogramming functions. Internal voltage generation handles all necessary levels, and programming is initiated using standard 5 V command sequences (e.g., 5555H/AAH, 2AAAH/55H). This eliminates external HV generators and simplifies system design.

How is the boot block lockout feature enabled on the AT49F512-55VU?

The boot block lockout feature on the AT49F512-55VU is enabled by executing a six-byte command sequence: load AAH to address 5555H, 55H to 2AAAH, 80H to 5555H, AAH to 5555H, 55H to 2AAAH, then 40H to 5555H - with a 1-second pause before the final command. Once activated, the 8K-byte region (0000H–1FFFH) becomes permanently write-protected.

Can the AT49F512-55VU be erased sector-by-sector?

No, the AT49F512-55VU supports only full-chip erase - not sector or block erase. The datasheet specifies a single 6-byte "Chip Erase" command that erases the entire 64K-word array (or 56K words if boot block lockout is active). There is no provision for partial or selective erase; all user data outside the boot block is cleared simultaneously during chip erase.

What package type does the AT49F512-55VU use, and what are its dimensions?

The AT49F512-55VU uses a 32-lead Very Small Outline Package (VSOP) with JEDEC MO-142 Variation BA compliance. Its body measures 8.0 mm × 14.0 mm (nominal), height ≤1.20 mm, and lead pitch 0.50 mm. Pin 1 is marked, and the package is Pb/halide-free - meeting RoHS requirements and rated for moisture sensitivity level 3.