Microchip Technology AT49BV040-90TC

Overview

AT49BV040-90TC from Atmel is a 4-megabit (512K × 8) single-voltage Flash memory IC operating at 2.7V–3.6V, featuring 70 ns read access time, 10-second chip erase, and 30 µs/byte programming - used for firmware storage and boot code retention in embedded controllers and industrial microcontroller systems.

For engineers reviewing the AT49BV040-90TC datasheet, AT49BV040-90TC pinout, AT49BV040-90TC application, or AT49BV040-90TC equivalent, key selection criteria include boot-block lockout capability, CMOS standby current (50 µA), TSOP-32 package compatibility, and software-controlled erase/program command set compliance with JEDEC-standard Flash protocols.

Technical Context

The AT49BV040-90TC implements a 512K × 8 architecture with bottom-boot sector organization (00000H–03FFFH), supporting hardware-protected write lockout for 16K-byte boot block. It uses internal command register logic to execute byte-program and chip-erase sequences without external high-voltage inputs.

Operation relies on dual-line control (CE/OE) for bus contention avoidance and supports Data Polling (I/O7 complement) and Toggle Bit (I/O6 toggling) for cycle completion detection. Programming requires four-bus-cycle command sequences with address/data latching synchronized to WE/CE edges.

Key Specifications

Pinout & Package

AT49BV040-90TC is packaged in a 32-lead Plastic Thin Small Outline Package (TSOP), 8 mm × 14 mm footprint (JEDEC MO-142 BA, type 32V), suitable for high-density PCB layouts and automated SMT assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SST39VF400A-90-4C-NHE and MX29LV400CTTI-90G, the AT49BV040-90TC uniquely delivers bottom-boot lockout with verified 10,000-cycle endurance and 50 µA standby current - making it optimal for safety-critical or battery-constrained systems where bootloader immutability is mandatory.

Availability

AT49BV040-90TC 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 AT49BV040-90TC 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, designs high-reliability nonvolatile memory and microcontroller solutions for industrial, automotive, and embedded applications.

The AT49BV/LV040 product line targets cost-sensitive, low-power embedded systems requiring field-upgradable firmware with hardware-secured boot code - emphasizing voltage flexibility, endurance, and JEDEC-standard command compatibility.

FAQ

What is the operating voltage range for the AT49BV040-90TC?

The AT49BV040-90TC operates across a single supply range of 2.7V to 3.6V. This voltage window enables direct integration with battery-backed systems and low-voltage regulators without level-shifting circuitry. The device incorporates VCC sense logic that disables programming if supply drops below 1.8V, preventing corruption during brown-out conditions. All DC and AC specifications, including 90 ns read access and 50 µA standby current, are guaranteed within this range.

Does the AT49BV040-90TC support hardware write protection for the boot sector?

Yes, the AT49BV040-90TC includes a hardware-enforced boot block lockout feature for its 16 KB bottom-boot region (00000H–03FFFH). Once activated via a documented six-command sequence, the lockout permanently prevents erasure or programming of that sector. The AT49BV040-90TC supports software detection of lockout status by reading I/O0 during product identification mode, ensuring bootloader integrity can be verified in-system.

What package type is used for the AT49BV040-90TC?

The AT49BV040-90TC uses a 32-lead Plastic Thin Small Outline Package (TSOP) with 8 mm × 14 mm footprint, designated as type 32V per JEDEC MO-142 BA. This surface-mount package features gull-wing leads optimized for automated assembly and thermal performance in compact industrial PCBs. It is distinct from the PLCC (32J) and larger 8 mm × 20 mm TSOP (32T) variants offered in the same family.

How does the AT49BV040-90TC indicate completion of a programming cycle?

The AT49BV040-90TC provides two independent methods: Data Polling and Toggle Bit. During programming, reading the last written byte returns the complement of the data on I/O7 until completion, then true data appears. Alternatively, I/O6 toggles between 0 and 1 during active programming and stops toggling once complete. Both mechanisms allow the host system to poll status without fixed timing delays, and both are fully supported in the AT49BV040-90TC's command protocol.

Is the AT49BV040-90TC compatible with standard Flash memory command sets?

Yes, the AT49BV040-90TC implements JEDEC-standard command sequences for read, byte program, chip erase, and product identification. It uses the widely adopted 5555h/2AAAh unlock sequence followed by operation-specific commands (e.g., 80h for erase, 40h for boot lockout). These commands are electrically and logically identical to those used by industry-standard 4 Mbit Flash devices, enabling reuse of existing driver libraries with minimal adaptation for the AT49BV040-90TC.