BY25Q40AWOIG(R)

Memory IC Overview

The BY25Q40AW is a 4M-bit SPI NOR Flash memory designed for code shadowing and data storage. It supports Standard, Dual, and Quad SPI interfaces with clock rates up to 85MHz for non-standard reads and 55MHz for normal reads. The device operates on a single supply voltage ranging from 1.65V to 3.6V. It features flexible erase architectures including 4KB sectors and 32/64KB blocks. Program and erase operations support suspend and resume functions. The memory includes hardware and software write protection mechanisms, such as block protect bits and security registers.

Memory IC Feature Summary

• Supports Standard, Dual, and Quad SPI communication modes with software reset capability.
• Features flexible erase architecture with 4KB sectors and 32/64KB uniform blocks.
• Includes comprehensive write protection via hardware pins and software-configurable status register bits.
• Provides low power consumption with active and power-down current specifications.

Memory IC Applications

• Code shadowing into embedded or external RAM for execution
• General-purpose data storage applications
• Consumer electronics requiring high-volume flash memory

Memory IC Procurement Notes

Verify the specific package variant (SOP-8, TSSOP-8, or USON-8) required for your design against the ordering information section of the datasheet. Confirm that the temperature grade (Commercial or Industrial) matches your environmental operating conditions. Ensure the supply voltage range of 1.65V to 3.6V is compatible with your system's power rails before integration.

Memory IC Selection Notes

Select this component when a 4M-bit density is required with support for high-speed Quad SPI operations. It is suitable for applications needing flexible block protection schemes and low standby power. Consider the available package options if board space is constrained, particularly the USON-8 variant. Verify that the 10k cycle endurance meets the write frequency requirements of your specific application.

Memory IC Part Context

The BY25Q40AW belongs to the BY25Q series of SPI NOR Flash memories manufactured by BYTe Semiconductor. This series is characterized by its compatibility with standard SPI protocols while offering enhanced performance through Dual and Quad I/O modes. The device is engineered for reliability in consumer electronics, providing robust data retention and endurance characteristics typical of modern NOR flash technologies.

Memory IC Replacement Considerations

Check for pin-compatible alternatives within the BY25Q series that may offer different densities or package types. Verify that any substitute maintains the same 1.65V-3.6V supply voltage range and SPI command set compatibility. Ensure the replacement part supports the required Quad SPI mode if high-speed read performance is critical to your design.

Memory IC FAQ

How does the /WP pin function in relation to the Status Register?

When the SRP bits are configured for hardware protection (SRP1=0, SRP0=1), driving the /WP pin Low locks the Status Registers, preventing any modification to the Block Protect bits and ensuring data integrity.

What is the purpose of the QE bit in Status Register 2?

The Quad Enable (QE) bit enables Quad SPI operation. When set to 1, it reconfigures the /WP and /HOLD pins to function as IO2 and IO3 respectively, allowing for four-bit data transfer.

Can program and erase operations be interrupted?

Yes, the device supports Program Suspend and Erase Suspend instructions. This allows the host to read data from the array while a program or erase cycle is in progress, resuming the operation later.