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Tiny Flash chips offer 16/32Mbit densities

Posted: 27 Oct 2006 ?? ?Print Version ?Bookmark and Share

Keywords:Winbond? SpiFlash? Winstack? W25X16? W25X32?

Winbond Electronics Corp. has announced two new members of its SpiFlash 25X family using the company's 0.13?m Winstack Flash technology. W25X16 and W25X32 offer 16Mbit and 32Mbit densities that fit into space-saving and cost-effective 8-pin 5.28mm SO8 packaging. The company said these are the highest density Serial Flash memories available in this small form factor.

Similar to Winbond's W25X10/20/40/80 (1-8Mbit SpiFlash memories), W25X16 and W25X32 promise the industry's highest performance and flexible 4Kbyte erasable sectors throughout the memory array. The packaging, performance and flexibility of these new devices make them suitable for a wide range of electronic applications including DVD drives and recorders, desktop and notebook PCs, WLAN devices, DSL modems, printers, cordless phones and more.

Smaller, simpler PCBs
High density Serial Flash memories (16Mbit and greater) are commonly packaged in the larger and more costly 16-pin 7.62mm SO16 with 8 unused pins. W25X16 and W25X32 use half the space of a 16-pin SOIC, resulting in smaller and simpler PCBs. The SO8 package also allows for a common footprint from 4Mbit to 32Mbit densities.

The new devices support standard SPI clock rates of up to 75MHz. This performance can be further improved to an equivalent of 150MHz clock rate (>18MBps) by using the optional Dual-Output Read instruction. The instruction provides two bits of data per clock while maintaining the same 4-pin SPI interface. The "double data rate" makes the 25X family the highest performance serial Flash available today, according to Windbond, allowing controllers to quickly shadow or cache code to RAM and even execute code directly from the SPI interface.

The new devices also feature uniform 4Kbyte erasable sectors and 64Kbyte erasable blocks through the entire array. The small 4Kbyte sectors allow for flexible and efficient memory allocation for code, as well as storage of parameter and configuration data typically handled by EEPROMs. The 4Kbyte size is also effective for applications that record and playback voice or audio clips such as cordless phones, answering machines, games and talking electronic products.

The W25X16VSSIG (16Mbit, 5.28mm SO8) is currently sampling and the W25X32VSSIG (32bit, 5.28mm SO8) will be sampling in December. Both products are available for production Q1 2007. Alternate packages include SO16 and WSON.

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