sgm7222 sg-micro, sgm7222 Datasheet - Page 8

• Manufacturer Part Number: sgm7222
• Description: High Speed Usb 2.0 Dpdt Analog Switch
• Manufacturer: sg-micro

APPLICATION NOTES:
Meeting USB 2.0 V
In section 7.1.1 of the USB 2.0 specification, it notes that
USB devices must be able to withstand a V
or D- when the USB devices is either powered off or
powered on. The SGM7222 can be successfully
configured to meet both these requirements.
Power-Off Protection
For a V
withstand such a condition for at least 24 hours. The
SGM7222 has specially designed circuitry which
prevents unintended signal bleed through as well as
guaranteed system reliability during a power-down,
over-voltage condition. The protection has been added
to the common pins (D+, D-).
BUS
short circuit, the switch is expected to
BUS
Short Requirements
BUS
short to D+
8
Power-On Protection
The USB 2.0 specification also notes that the USB device
should be capable of withstanding a V
transmission of data. This modification works by
limiting current flow back into the V+ rail during the
over-voltage event so current remains within the safe
operating range. In this application, the switch passes
the full 5.25V input signal through to the selected output,
while maintaining specified off isolation on the
un-selected pins.
SGM7222
BUS
short during