The W25Q64JVSSIQ is a 64M-bit (8M-byte) serial flash memory device from Winbond Electronics, part of the popular W25Q series of SpiFlash memories . It is designed to provide high-performance, flexible, and space-efficient storage solutions for embedded systems where board space, pin count, and power consumption are critical constraints .
The memory array is organized into 32,768 programmable pages of 256 bytes each, allowing up to 256 bytes to be programmed at a time . For erase operations, the device supports multiple granularities:
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4KB sector erase (2,048 sectors)
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32KB block erase (128 blocks)
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64KB block erase (64 blocks)
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Full chip erase
The small 4KB sectors provide exceptional flexibility for applications requiring frequent data and parameter updates, as they eliminate the need to erase larger blocks when modifying small amounts of data .
The device supports multiple SPI modes for versatile system integration:
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Standard SPI: CLK, /CS, DI, DO
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Dual SPI: CLK, /CS, IO0, IO1
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Quad SPI: CLK, /CS, IO0, IO1, IO2, IO3
This allows systems to balance between pin count and data throughput. When operating in Quad SPI mode at 133MHz, the effective data rate reaches 532MHz, outperforming many legacy parallel flash memories while using far fewer I/O pins .
Additional features include:
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Efficient “Continuous Read” Mode: Requires as few as 8 clocks to address memory, enabling true XIP (Execute In Place) operation
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Erase/Program Suspend & Resume: Allows interrupt-driven firmware updates with minimal latency
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Security Features: 3 x 256-byte Security Registers for permanent identification, 64-bit Unique ID, and discoverable parameters (SFDP) register
The “SSIQ” suffix in the part number indicates:
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SS = 8-pin SOIC 208-mil package
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I = Industrial temperature range (-40°C to +85°C)
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Q = Green package (lead-free, RoHS compliant, halogen-free) with QE=1 in Status Register-2
