Microchip Technology AT49BV802AT-70TI-T

Overview

AT49BV802AT-70TI-T from Microchip Technology (formerly Atmel) is an 8-Mbit (524,288 × 16 or 1,048,576 × 8) single-supply Flash memory IC used for nonvolatile code and data storage in embedded systems. It operates at 2.65–3.6 V, delivers 70 ns access time, supports sector erase with 15 × 64 KB + 8 × 8 KB configuration, and features suspend/resume for concurrent read/program during erase - enabling real-time firmware updates in industrial controllers.

For engineers reviewing the AT49BV802AT-70TI-T datasheet, AT49BV802AT-70TI-T pinout, AT49BV802AT-70TI-T application, or AT49BV802AT-70TI-T equivalent, key selection considerations include its TSOP-48 package, byte/word mode select via BYTE pin, CFI compliance for auto-configuration, 128-bit protection register for secure boot, and sector lockdown capability for immutable bootloader storage.

Technical Context

The AT49BV802AT-70TI-T implements a command-register-based architecture with dual-mode addressing (A-1 LSB in byte mode), hardware reset control, and open-drain RDY/BUSY signaling. Its internal write state machine handles embedded program/erase timing without external clocks, supporting both chip- and sector-level erasure via six-byte software commands.

It integrates three status detection methods - Data Polling (I/O7), Toggle Bit (I/O6), and Erase/Program Status (I/O5) - configurable via a two-bit register that determines automatic return to read mode or requirement of Product ID Exit. The device also includes hardware data protection (VCC sense, power-on delay, and control-line inhibit).

Key Specifications

Pinout & Package

AT49BV802AT-70TI-T is packaged in a 48-lead TSOP Type I (Thin Small Outline Package) with 0.5 mm pitch, RoHS-compliant and halide-free. Pinout supports x8/x16 data bus modes, sector-selectable lockdown, and hardware reset initialization.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SST39VF800A-70-4C-NHE and MX29LV800CTTI-70G, the AT49BV802AT-70TI-T uniquely combines CFI compliance, RDY/BUSY signaling, BYTE-selectable bus width, and symmetric sector architecture - making it optimal for new designs requiring field-upgrade resilience and vendor-agnostic firmware tooling.

Availability

AT49BV802AT-70TI-T is available at Aetrix Electronics and suitable for industrial PLCs, medical diagnostic devices, automotive infotainment units, and network infrastructure requiring stable component supply and long-term obsolescence planning.

Supply support for AT49BV802AT-70TI-T 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 support for legacy Atmel Flash products including the AT49BV series.

The AT49BV802AT-70TI-T belongs to Atmel's parallel-interface Flash memory product line, designed specifically for embedded systems requiring robust in-system programmability, sector-level security, and deterministic timing in resource-constrained environments.

FAQ

What is the difference between AT49BV802A and AT49BV802AT in the AT49BV802AT-70TI-T part number?

The "T" suffix in AT49BV802AT-70TI-T denotes the top-boot block configuration, where the smallest 8 KB sectors (SA15–SA22) are located at the highest address range (0xF00000–0xFFFFFF). This contrasts with the base AT49BV802A, which uses bottom-boot (smallest sectors at lowest addresses). The AT49BV802AT-70TI-T retains identical electrical specs, pinout, and command set - only sector address mapping differs, directly impacting bootloader placement strategy.

Does AT49BV802AT-70TI-T support both x8 and x16 data bus widths, and how is mode selected?

Yes, AT49BV802AT-70TI-T supports both x8 and x16 operation. The BYTE pin controls mode: logic high selects x16 (I/O0–I/O15 active), logic low selects x8 (I/O0–I/O7 active, I/O8–I/O14 tri-stated, I/O15 becomes A-1 address input). This enables seamless integration with 8-bit or 16-bit microcontrollers without redesigning the PCB layout - the AT49BV802AT-70TI-T adapts its interface dynamically based on this single control signal.

How does the sector lockdown feature work in AT49BV802AT-70TI-T, and can locked sectors be unlocked?

Sector lockdown in AT49BV802AT-70TI-T is enabled per sector via a six-cycle command (555h/AAh, AAh/55h, 555h/80h, 555h/AAh, AAh/55h, SA/60h). Once locked, the sector becomes read-only - no erase or program operations are permitted. Unlocking requires a hardware reset or power cycle; no software command exists to reverse lockdown. This ensures AT49BV802AT-70TI-T bootloader regions remain tamper-proof across power cycles.

What status detection methods does AT49BV802AT-70TI-T provide for program/erase completion?

AT49BV802AT-70TI-T offers three concurrent status detection methods: (1) RDY/BUSY pin (open-drain, active-low), (2) Data Polling on I/O7 (complement-to-data or high-assertion depending on config register), and (3) Toggle Bit on I/O6 (toggles during operation, stops when complete). All three are usable simultaneously, giving designers flexibility to choose hardware interrupt (RDY/BUSY), polling efficiency (Data Polling), or minimal pin usage (Toggle Bit) - all fully supported in AT49BV802AT-70TI-T.

Is AT49BV802AT-70TI-T compatible with Common Flash Interface (CFI), and what value does it add?

Yes, AT49BV802AT-70TI-T is CFI-compliant (v1.0). Entering CFI Query mode (write 98h to address 55h) allows host software to read standardized parameter tables - including geometry, timings, command sets, and sector maps - directly from the device. This eliminates hardcoded assumptions, enables automatic driver generation, simplifies second-source qualification, and future-proofs firmware against flash vendor changes - a core capability of the AT49BV802AT-70TI-T.