AT49F001ANT-55VI

Memory IC Overview

The AT49F001ANT-55VI is a 1-megabit (128K x 8) 5-volt only in-system reprogrammable Flash memory manufactured by Microchip Technology. It features a maximum access time of 55 ns and operates within an industrial temperature range of -40°C to +85°C. The device utilizes a sector architecture comprising one 16K-byte boot block, two 8K-byte parameter blocks, and two main memory blocks. It supports byte-by-byte programming with typical times of 30 µs per byte and offers hardware data protection alongside software command sequences for erase and program operations.

Memory IC Feature Summary

• Supports single-voltage 5V read and reprogramming operations without requiring high input voltages.
• Includes a dedicated 16K-byte boot block with optional software-controlled programming lockout for secure code storage.
• Provides hardware data protection mechanisms including VCC sense, program inhibit, and noise filtering.
• Features internal program control and timers that eliminate the need for external clocks during programming cycles.

Memory IC Applications

• In-system reprogrammable nonvolatile storage
• Secure boot code storage with write protection
• Industrial embedded applications requiring 5V operation

Memory IC Procurement Notes

Verify the specific suffix VI corresponds to the VSOP package type and 55 ns speed grade as defined in the official ordering information. Confirm the manufacturer origin, noting historical Atmel branding may appear on legacy documentation. Ensure the component meets the specified industrial temperature range requirements for your application environment.

Memory IC Selection Notes

Select this component when a 5-volt only Flash memory solution is required for systems needing in-system reprogrammability. The AT49F001ANT variant provides a compact VSOP package suitable for space-constrained designs. Consider the boot block lockout feature if secure code execution is necessary before main memory updates.

Memory IC Part Context

This part belongs to the AT49F001A series of 1-megabit Flash memories. The 'ANT' designation indicates the TSOP or VSOP plastic thin small outline package configuration, while '55' specifies the 55 nanosecond access time performance tier. The 'VI' suffix typically denotes the specific package variant and operating temperature range within the product line.

Memory IC Replacement Considerations

Compatible substitutes include AT49F001AN-55VI and AT49F001AT-55VI, which share identical electrical specifications but differ in package style. Cross-referencing pinouts and command sequences is recommended when transitioning between package types.

Memory IC FAQ

How is the boot block programming lockout feature enabled?

The lockout feature is enabled via a six-step software command sequence involving specific address and data patterns written to the device.

What happens to the boot block during a chip erase if the lockout is active?

If the boot block programming lockout is enabled, the chip erase function will erase all sectors except the boot block.

Can the boot block be reprogrammed after the lockout is enabled?

Yes, by applying a 12V signal to the RESET pin, the lockout can be overridden to allow erasure or programming of the protected boot block.