Microchip Technology AT49BV001A-55TI

Overview

AT49BV001A-55TI from Atmel is a 1 Mbit (128K × 8) single-supply 2.7–3.6 V in-system reprogrammable Flash memory IC with 55 ns read access time, 30 µs/byte programming, and sector-based erase architecture including a 16K-byte boot block with programmable lockout. It operates across the industrial temperature range (−40°C to +85°C) and is used for firmware storage and boot code retention in embedded controllers.

For engineers reviewing the AT49BV001A-55TI datasheet, AT49BV001A-55TI pinout, AT49BV001A-55TI application, or AT49BV001A-55TI equivalent, key selection considerations include its 32-pin TSOP package, hardware data protection features, DATA polling/toggle bit status detection, and boot block lockout override via 12 V RESET input - critical for secure firmware update designs.

Technical Context

The AT49BV001A-55TI implements a command-register-based architecture requiring six-byte software sequences for chip/sector erase and boot lockout enablement. Its memory is partitioned into one 16K-byte boot block (address 1C000H–1FFFFH), two 8K-byte parameter blocks, and two main memory blocks (32K + 64K bytes), all erasable independently.

It supports standard EPROM-like read timing with CE/OE/WE control, uses internal program pulse generation, and provides dual status verification methods: DATA polling on I/O7 and toggle-bit monitoring on I/O6. Hardware protection includes VCC sense (<1.8 V inhibits programming), noise filtering (<15 ns pulses ignored), and control-line inhibit logic (OE low, CE high, or WE high blocks writes).

Key Specifications

Pinout & Package

AT49BV001A-55TI is packaged in a 32-lead Thin Small Outline Package (TSOP, Type I, 8 × 20 mm, package code 32T), compliant with JEDEC MO-142 Variation BD. Pin 1 is marked by a notch or beveled corner; pin 9 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 SST39VF010-55-4C-NHE and MX29LV160CBTI-55G, the AT49BV001A-55TI uniquely combines boot block lockout with 12 V RESET override for field-recoverable secure boot - a differentiator for safety-critical or long-lifecycle embedded deployments where firmware integrity assurance is mandatory.

Availability

AT49BV001A-55TI is available at Aetrix Electronics and suitable for industrial PLC firmware storage, medical device bootloader retention, and automotive body control module configuration requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for AT49BV001A-55TI 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 fabless semiconductor company specializing in microcontrollers, nonvolatile memory, and security ICs for embedded systems.

The AT49BV001A-55TI belongs to Atmel's Battery-Voltage™ Flash memory family, designed specifically for low-voltage in-system reprogramming in space-constrained, power-sensitive embedded applications where firmware integrity and field upgradeability are essential.

FAQ

What is the function of the RESET pin on the AT49BV001A-55TI?

The RESET pin on the AT49BV001A-55TI serves dual functions: at TTL logic levels (≤0.8 V), it halts ongoing operations and places outputs in high-impedance state; when driven to 12 V ±0.5 V, it overrides the boot block programming lockout during erase or program cycles. This 12 V override capability is unique to the AT49BV001A-55TI and not present in the AN/T variants, enabling secure field recovery of locked boot sectors without requiring device replacement.

How does the AT49BV001A-55TI handle boot block protection?

The AT49BV001A-55TI implements boot block protection via a six-byte command sequence that activates permanent write inhibition for the 16K-byte sector at addresses 1C000H–1FFFFH. Once enabled, programming or erasing this region is blocked for all input voltages ≤5.5 V. The AT49BV001A-55TI retains the ability to override this lock using 12 V on the RESET pin - a feature absent in AN/T variants - allowing authorized reprogramming while preserving security in normal operation.

What package type is used for the AT49BV001A-55TI?

The AT49BV001A-55TI uses a 32-lead Thin Small Outline Package (TSOP, Type I) measuring 8 mm × 20 mm (package code 32T), compliant with JEDEC MO-142 Variation BD. Pin 9 is designated as NC (no connect), distinguishing it from PLCC and VSOP variants. This surface-mount package supports automated assembly and provides thermal performance suitable for industrial temperature operation (−40°C to +85°C).

Can the AT49BV001A-55TI be used as a direct replacement for EPROMs?

Yes, the AT49BV001A-55TI is pin- and command-compatible with standard 27C010 EPROMs in read mode: it uses identical CE/OE/WE control signaling, delivers data within 55 ns, and presents high-impedance outputs when deselected. Unlike EPROMs, it requires no UV erasure or 12 V programming - instead using 2.7–3.6 V single-supply in-system reprogramming with software command sequences, making it a drop-in upgrade for legacy designs seeking field-upgradability.

What status detection methods does the AT49BV001A-55TI support during programming?

The AT49BV001A-55TI supports two real-time status detection methods: DATA polling, where reading the programmed byte returns its complement on I/O7 until completion, and the toggle bit method, where I/O6 alternates between 0 and 1 during active programming or erase. Both methods eliminate reliance on fixed timing delays, enabling deterministic host firmware control. These features are fully operational across the industrial temperature range and require no additional hardware.