ISD-300A1 Cypress Semiconductor Corp, ISD-300A1 Datasheet - Page 51

• Manufacturer Part Number: ISD-300A1
• Description: IC USB 2.0 BRIDGE BULK 100LQFP
• Manufacturer: Cypress Semiconductor Corp

Specifications of ISD-300A1

• Applications: USB 2.0 to ATA/ATAPI Bridge
• Interface: ATA, ATAPI
• Voltage - Supply: 3 V ~ 3.6 V
• Package / Case: 100-LQFP
• Mounting Type: Surface Mount
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: 428-1459

October 19, 2001
ATA Interface Termination
Design practices as outlined in the ATA/ATAPI-5 Specification for signal integrity should be followed with
systems that utilize a ribbon cable interconnect between the ISD-300A1 ATA interface and the device,
especially if Ultra Mode DMA is utilized.
3.3V Power Regulation
In systems where the ATA/ATAPI device remains powered during ISD-300A1 low power operation (such
as USB suspend state), the system design must insure the ISD-300A1 3.3V supply is not “back powered”
through IO cell leakage current from the device’s 5V ATA interface, raising the supply rail above safe
operating limits. Typically this may be accomplished by utilizing a 1.5K ohm resistive current sink
between the 3.3V supply and ground.
VBUS Powered System Considerations
GPIO Internal Pull Down Resistors
All ISD-300A1 GPIO IO cells incorporate an internal pull down resistor (50K ohm typical). The system
must insure the GPIO interface is at logic ‘0’ to eliminate current draw during the USB suspend state.
Absolute Maximum Ratings
Stresses in excess of the absolute maximum ratings can cause permanent damage to the device. These are
absolute stress ratings only. Functional operation of the device is not implied at these or any other
conditions in excess of those given in the operations sections of this data sheet. Exposure to absolute
maximum ratings for extended periods can adversely affect device reliability.
Table 24 – Absolute Maximum Ratings
Symbol
VDD
Vin
Ta
Tstrg
Parameter
3.3 V IO Supply
Input Pin Voltage
Ambient Operating Temperature Range
Storage Temperature
46
Min
-0.5
-0.5
-40°
-65
Max
4.0
5.5
85°
150
ISD-300A1
Units
Volts
Volts
Celsius
Celsius