Mobile Storage
SM3257
USB2.0 Flash Memory Controller
The SM3257 is the latest USB Flash Disk controller
with highly compatibility, and best performance
intended for supporting Single-Channel MLC and TLC
NAND type Flash memory in one chip. Based on
0.152um fabricated technology and low power
consumption consideration, SM3257 complies with
USB power specification ver.2.0 for bus-powered
devices. For USB2.0 Flash Disk application, SM3257
supports high capacity up to 4 data Flash banks,
“Write Protect” function, PC boot-up from USB2.0
Flash Disk, Password protection, and Secured
Partitioning functions.
SM3257 controller also delivers extremely high data
transfer rate and correct data through reliable
13/24/40-bit ECC engine for the coverage of the
MLC/TLC flash read/write disturbance. By integrating
5V to 3.3V regulator and Power-on-Rest components,
it will help customers to save overall cost. SM3257 is
available with 48pins LQFP package, 48pins TQFP
package and 40pins QFN package with a
manufacturing-ready turnkey solution now.
Applications
Dyna Family
USB Flash Drive
USB Solid State Disk
Embedded Application
High-Speed NAND Storage
Key Features
Embedded crystal offers lower BOM cost
1.8V low-power core operation
Built-in 5V/3.3V and 3.3V/1.8V voltage regulators
Complete compatibility with USB (Universal Serial
Bus) Specification Rev. 2.0
Complies with USB Mass Storage Class
Specification Rev. 1.0
USB Mass Storage Class Bulk-Only Transport
Protocol
Complies with USB power specifications for bus-
powered devices
Integrated 80C51-compatible, 8-bit
microprocessor with enhanced features
Supports suspend mode and wake-up resume
Configurable BCH error control coding (ECC)
Supports MLC/TLC up to 4 NAND flash devices
Supports the operating systems: Windows 7,
Windows Vista, Windows XP, Windows 2000,
Windows ME, Windows 98/98SE, Mac OS 9.x and
above, and Linux kernel 2.4 and above
Supports Windows Vista and Windows 7
ReadyBoost function
In System Programming (ISP) firmware update
capability
Supports VID, PID, serial number, and vendor
information updates
Supports LED indicator to indicate the USB Flash
Disk is in the Ready/Working mode
Supports “Write Protect” security function to
protect the data in USB Flash Disk
Available in LQFP/TQFP 48pin and QFN 40pin
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