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The GL823 is a USB 2.0 SD/MMC Flash Card Reader single chip. It supports USB 2.0 high-speed transmission to Secure DigitalTM (SD), SDHC, SDXC, miniSD, microSD (T-Flash), MultiMediaCardTM (MMC), RS-MMC, MMCmicro, MMCmobile on one chip. As a single chip solution for USB 2.0 flash card reader, the GL823 complies with Universal Serial Bus specification rev. 2.0, USB Storage Class specification ver.1.0, and SD/MMC card interface specification.


The GL823 integrates a high speed 8051 microprocessor and a high efficiency hardware engine for the best data transfer performance between USB and flash card interfaces. Its’ pin assignment design fits to card sockets to provide easier PCB layout. Inside the chip, it integrates 5V to 3.3V and 3.3V to 1.8V regulators and power MOSFETs and it enables the function of on-chip clock source (OCCS) which means no external 12MHz XTAL is needed and that effectively reduces the total BOM cost.

USB specification compliance 
- Comply with 480Mbps Universal Serial Bus specification rev. 2.0
- Comply with USB Storage Class specification rev. 1.0
- Support one device address and up to four endpoints: Control (0)/Bulk Read (1)/Bulk Write(2)/Interrupt (3)
Integrated USB building blocks
- USB2.0 transceiver macro (UTM), Serial Interface Engine (SIE), Build-in power-on reset (POR) and low-voltage detector (LVD)
Embedded 8051 micro-controller
- Operate @ 60 MHz clock, 12 clocks per instruction cycle
- Embedded mask ROM and internal SRAM
Secure DigitalTM (SD) and MultiMediaCardTM (MMC)
- Support SD specification v1.0 / v1.1 / v2.0/ SDHC (Up to 32GB)
- Compatible with SDXC (Up to 2TB)
- Support MMC specification v3.x / v4.0 / v4.1 / v4.2.
- x1 / x4 bit data bus
On chip clock source and no need of 12MHz Crystal Clock input.
On-Chip 5V to 3.3V and 3.3V to 1.8V regulators
Support 5V to 3.3V Band Gap Regulator for stable voltage supply
Provide Over-Current protection mechanism for safety power supply 
On-Chip power MOSFETs for supplying flash media card power
Support Power Saving mode/ Selective suspend mode for better power management. Only available in QFN-24(A) package.
Support external serial EEPROM interface for the flexibility to load the vendor information and  system  options
Operating system supported: Windows 7/Vista32&64/XP/2000/Me/98/98SE, Mac OS 9.X/10.X, Linux Kernel 2.4.X/2.6.X
- Pass Windows Vista/ Windows 7 (Submission ID: 1355289)
USB-IF Logo (Submission TID: 40000940)
Package available in 24 pin SSOP (209 mil) and 24 pin QFN (4x4 mm)


Package Type

Version Power Source Power Management
SSOP 24 04, 06, …N 5V Not Support
QFN-24 (A) 04, 06, …N 3.3V Power Saving Mode/ Selective Suspend Mode
QFN-24 (B) 05, 07, …N+1 5V Not Support


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