AT45DB161B-CI

Memory IC Overview

The AT45DB161B-CI is a 16-megabit DataFlash serial interface Flash memory designed for digital voice, image, program code, and data storage applications. It features a single supply voltage of 2.5V to 3.6V or 2.7V to 3.6V and supports SPI Mode 0 and Mode 3 with a maximum clock frequency of 20 MHz. The memory array consists of 4096 pages, each containing 528 bytes. Two 528-byte SRAM data buffers facilitate continuous data streaming and EEPROM emulation through Read-Modify-Write operations.

Memory IC Feature Summary

• Dual 528-byte SRAM buffers enable receiving data while main memory is reprogrammed, supporting continuous data streams and EEPROM emulation.
• SPI compatible interface allows sequential access via three wires (SI, SO, SCK), reducing pin count and switching noise compared to parallel interfaces.
• Hardware write protection on the first 256 pages ensures critical data integrity without requiring high input voltages for programming.
• Continuous read capability across the entire array facilitates efficient code shadowing applications without page boundary delays.

Memory IC Applications

• Digital voice recording and playback systems
• Image storage in embedded devices
• Program code shadowing and execution
• Data logging and non-volatile data storage

Memory IC Procurement Notes

Verify that the specific ordering suffix matches the required package type and temperature range. Confirm the voltage variant corresponds to the system power supply requirements. Ensure compatibility with existing SPI controller configurations regarding clock polarity and phase settings before integration.

Memory IC Selection Notes

Select this component when low pin count and simple serial interface are prioritized over random access speeds. It is suitable for applications requiring moderate density storage with flexible erase granularity. Consider the dual buffer architecture if continuous data throughput is necessary during programming cycles.

Memory IC Part Context

This device belongs to the AT45DBxxxx series of Serial DataFlash memories manufactured by Microchip Technology (formerly Atmel). It offers high density in a compact package, utilizing a serial interface to minimize hardware complexity. The series is optimized for commercial and industrial environments requiring reliable non-volatile storage.

Memory IC Replacement Considerations

The datasheet states the device is 100% compatible with the AT45DB161. Verify electrical specifications and pinout compatibility when substituting with other models in the AT45DB family.

Memory IC FAQ

How does the AT45DB161B handle data modification within a page?

It supports EEPROM emulation through a three-step Read-Modify-Write operation using its internal SRAM buffers, allowing bit or byte alterability without full page erasure.

What is the function of the WP pin?

The Write Protect (WP) pin provides hardware protection for the first 256 pages of the main memory. When held low, these pages cannot be reprogrammed.

Can the device operate without an external reset circuit?

Yes, the device incorporates an internal power-on reset circuit, so no external reset components are strictly required for normal operation.