Microchip Technology AT49F001AN-55VI

Overview

AT49F001AN-55VI from Atmel is a 5V-only, 1 Mbit (128K × 8) in-system reprogrammable Flash memory with 55 ns read access time, 3-second chip erase cycle, and sector architecture comprising one 16K-byte boot block, two 8K-byte parameter blocks, and two main memory blocks (32K + 64K bytes). It supports byte-by-byte programming at 30 µs/byte and features hardware data protection, DATA polling, and CMOS standby current of 50 µA - deployed in industrial embedded systems for firmware storage and field-upgradable boot code.

For engineers reviewing the AT49F001AN-55VI datasheet, AT49F001AN-55VI pinout, AT49F001AN-55VI application, or AT49F001AN-55VI equivalent, key selection criteria include 55 ns read timing, boot block lockout capability, PLCC-32 package compatibility, sector-erase flexibility, and 10,000 write-cycle endurance under industrial temperature range (-40°C to +85°C).

Technical Context

The AT49F001AN-55VI implements a command-based architecture requiring six-byte sequences for chip/sector erase and boot block lockout enable, with address latching on falling WE/CE edges and data latching on rising edges. Its internal program control logic eliminates external high-voltage programming supplies.

It uses standard EPROM-compatible CE/OE/WE control signals to avoid bus contention, supports hardware RESET for operation halt and high-impedance output state, and includes VCC sense (inhibit below 3.8 V), noise filtering (<15 ns pulses ignored), and program-inhibit logic (OE low, CE high, or WE high disables programming).

Key Specifications

Pinout & Package

AT49F001AN-55VI is supplied in a 32-lead Plastic J-Leaded Chip Carrier (PLCC) package per JEDEC MS-016, Variation AE, with 12.3–12.6 mm × 14.9–15.1 mm footprint and 1.27 mm lead pitch. Pin 1 is marked by corner chamfer; pin 1 is NC (no connect) for this variant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AM29LV001BT-55REI and SST39VF010-55-4C-NHE, the AT49F001AN-55VI provides native 5V operation, hardware RESET support, and configurable boot block lockout - reducing BOM count and enabling safer in-field firmware updates in legacy industrial systems.

Availability

AT49F001AN-55VI is available at Aetrix Electronics and suitable for industrial PLCs, embedded bootloader implementations, and telecom line card configurations requiring stable component supply across extended product lifecycles.

Supply support for AT49F001AN-55VI 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 security ICs for industrial, automotive, and consumer applications.

The AT49F001A(N)(T) family delivers 5V-only Flash memory optimized for in-system reprogrammability in resource-constrained embedded systems - designed to replace UV-erasable EPROMs while maintaining pin and timing compatibility.

FAQ

What is the boot block address range for AT49F001AN-55VI?

The AT49F001AN-55VI uses the standard AT49F001A(N) boot block address range: 00000H to 03FFFH (16K bytes). This is confirmed in the datasheet's "Notes" section (Note 3) and sector map for AT49F001A(N), distinct from the T-suffix variant which places the boot block at 1C000H–1FFFFH. The AT49F001AN-55VI retains the base A(N) memory map.

Does AT49F001AN-55VI support boot block programming lockout override via RESET pin?

No. The AT49F001AN-55VI does not support boot block lockout override using the RESET pin. As explicitly stated in the datasheet (Section "BOOT BLOCK PROGRAMMING LOCKOUT OVERRIDE"), this 12V override feature is unavailable on the AT49F001AN(T) variant. Once enabled, the boot block is permanently protected under 5.5V or less - requiring full chip erase only if lockout is disabled beforehand.

What package type is used for AT49F001AN-55VI?

The AT49F001AN-55VI uses the 32-lead Plastic J-Leaded Chip Carrier (PLCC) package, designated as "32J" in Atmel's ordering information. This is confirmed in the "AT49F001AN Ordering Information" table (page 14) and the PLCC mechanical drawing (page 15) - with pin 1 identified by corner chamfer and defined as NC (no connect) for this variant.

How is the end of a program cycle detected on AT49F001AN-55VI?

The AT49F001AN-55VI supports two hardware methods: DATA polling (I/O7 returns complement of loaded data until completion, then true data) and Toggle Bit detection (I/O6 toggles between 0 and 1 during programming, then stabilizes). Both are asynchronous, require no external clocks, and are usable at any point during the 30 µs typical byte program cycle - enabling deterministic host firmware timing.

Is AT49F001AN-55VI compatible with standard EPROM socket footprints?

Yes. The AT49F001AN-55VI in PLCC-32 package shares identical mechanical dimensions, lead pitch (1.27 mm), and pinout (A0–A16, I/O0–I/O7, CE/OE/WE, VCC/GND) with industry-standard 27C010/27C020 EPROMs. Its EPROM-compatible read mode and control signal behavior allow drop-in replacement in existing sockets - provided the host system supports the command sequences for programming and erase.