BY25Q40BSMIG(R)

Memory IC Overview

The BY25Q40BS is a 4M-bit Serial Peripheral Interface (SPI) NOR Flash memory device manufactured by BYTe Semiconductor. It supports Standard, Dual, Quad SPI, and QPI modes with data transfer rates up to 432 Mbits/s. The device operates on a single supply voltage ranging from 2.7V to 3.6V. Key performance metrics include a typical page program time of 0.6ms, sector erase time of 50ms, block erase time of 0.15s or 0.25s, and chip erase time of 4s. It features flexible architecture with 4KB sectors and 32/64KB blocks, low power consumption with 20mA active current, and endurance of 100k program-erase cycles.

Memory IC Feature Summary

• Supports multiple interface modes including Standard, Dual, Quad SPI, and QPI for high-speed data transfer and XIP operations.
• Provides comprehensive write protection via software commands, hardware /WP pin control, and One-Time Programmable (OTP) security registers.
• Features flexible memory architecture with uniform 4KB sectors and 32/64KB blocks, allowing granular erase and protection selection.
• Includes status register protect mechanisms enabling hardware lock-down, power supply lock-down, and permanent OTP protection.

Memory IC Applications

• Execute In Place (XIP) applications requiring direct code execution from flash memory.
• Storage for firmware and boot code in embedded systems and microcontrollers.
• Data logging and configuration storage in industrial and consumer electronic devices.
• Battery management systems requiring reliable non-volatile memory with low power consumption.

Memory IC Procurement Notes

Verify the specific package variant required, as the datasheet lists SOP 208mil, WSON 6x5mm, and USON 2x3mm options. Confirm temperature range requirements against Commercial (0℃ to +70℃), Industrial (-40℃ to +85℃), and Extended Industrial (-40℃ to +105℃) grades. Ensure ordering suffixes match the desired package and temperature specifications exactly.

Memory IC Selection Notes

Select this component when high-speed Quad I/O or QPI interfaces are needed for bandwidth-intensive applications. Consider the 2.7V to 3.6V supply voltage range for compatibility with system power rails. Evaluate the need for hardware write protection via the /WP pin if security against accidental writes is critical. Check available packages against board space constraints, particularly for the compact USON or WSON options.

Memory IC Part Context

The BY25Q40BS belongs to the BY25Q40 series of 4M-bit SPI NOR Flash memories from BYTe Semiconductor. This series is designed for cost-effective, high-performance storage solutions. The BS variant specifically denotes support for extended industrial temperature ranges and potentially different package options compared to other suffixes like GW or WT. It shares core architectural features with the broader family but offers specific electrical and thermal characteristics defined in its datasheet.

Memory IC Replacement Considerations

BY25Q40GWTIG(R)

Memory IC FAQ

How does the device handle hold conditions during serial communication?

The /HOLD signal pauses serial communications without resetting the clocking sequence. The operation starts on the falling edge of /HOLD when SCLK is low and ends on the rising edge of /HOLD when SCLK is low. It does not interrupt ongoing program or erase operations.

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

The Quad Enable (QE) bit enables Quad I/O and QPI modes. When set to 1, it allows the use of IO2 and IO3 pins for data input/output instead of /WP and /HOLD functions. It must be set before entering QPI mode.

Can the Status Register be permanently protected?

Yes, the SRP1 and SRP0 bits allow for One-Time Program (OTP) protection. When configured for OTP, the Status Register becomes permanently read-only and cannot be written to again.