Features: ` Backward Compatible with G570
` Fully Integrated VCC and Vpp Switching for Dual Slot PC CardTM Interface
` 3-Lead Serial Interface Compatible With CardBusTM Controllers
` 3.3V Low Voltage Mode
` Meets PC Card Standards
` RESET for System Initialization of PC Cards
` 12V Supply Can Be Disabled Except During 12V Flash Programming
` Short Circuit and Thermal Protection
` 30 Pin SSOP
` Compatible With 3.3V, 5V and 12V PC Cards
` Low RDS(on) (180-m 5V VCC Switch; 130 m 3.3V VCC Switch)
` Break-Before-Make Switching
` Internal power-On Reset
` Standby mode: 60mA current limit (TYP)Application· Notebook PC
· Electronic Dictionary
· POSPinout
SpecificationsInput voltage range for card power:
VI(3.3V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 6V
VI(5V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...................... . -0.3V to 6V
VI(12V) . . . . . . . . . . . . . . . . . . . . . . . . . . . ..................... .-0.3V to 14V
Logic input voltage. . . . . . . . . . . . . . . . . ........................ . -0.3V to 6V
Output current (each card):
IO (xVCC) . . . . . . . . . . . . . . . . . . . . . .................... . . internally limited
IO(xVPP) . . . . . . . . . . . . . . . . . . . . .................... . . . .internally limited
Operating virtual junction temperature range, TJ . .. . . -40 to 125
Operating free-air temperature range, TA. . . . . . ..... . . .-40 to 85
Storage temperature range,TSTG. . . . . . .................. . .-55 to 150
Thermal resistance JA SSOP-30. . . . .. . . . . . . . . . ... . . . . . .122/W
Power dissipation PD (TA +25)
SSOP-30. . . . . . . . . . . . . ..................... . . . . . . . . . . . . . . .1024mW
ESD. . . . . . . . . . . . . . . . .. . . . . . .................... . . . . . . . . . . . .Note1
*Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the
device. These are stress rating only, and functional operation of the device at these or any other conditions
beyond those indicated under "recommended operating conditions" is not implied. Exposure to absolute
- maximum-rated conditions for extended periods may affect device reliability.
Note 1: ESD (electrostatic discharge) sensitive device. Proper ESD precautions are recommended to
avoid performance degradation or less of functionality.
DescriptionThe G574 PC Card power-interface switch provides an integrated power-management solution for two PC Cards. All of the discrete power MOSFETs, a logic section, current limiting, and thermal protection for PC Card control are combined on a single integrated circuit (IC). The circuit allows the distribution of 3.3V, 5V, and/or 12V card power by means of the Serial interface. The current-limiting feature eliminates the need for fuses, which reduces component count and improves reliability.
The G574 features a 3.3V low voltage mode that allows for 3.3V switching without the need for 5V supply. This
facilitates low power system designs such as sleep mode and pager mode where only 3.3V is available.
The G574 incorporates a reset function, selectable by one of two inputs, to help alleviate system errors. The reset function enables PC card initialization concurrent with host platform initialization, allowing a system reset. Reset is accomplished by grounding the VCC and VPP (flash-memory programming voltage) outputs, which discharges residual card voltage.
G574 also has the ability to program the xVpp outputs independent of the xVCC outputs. A standby
mode that changes all output-current limits to 50mA (typical) has been incorporated.
End equipment for the G574 includes notebook computers, desktop computers, personal digital assistants (PDAs), digital cameras and bar-code scanners.
The G574 is backward-compatible with the G570.
G574 Data Sheet
