XR21V1412_10 Datasheet, PDF (6/30 Pages) Exar Corporation – 2-CH FULL-SPEED USB UART

XR21V1412
2-CH FULL-SPEED USB UART
Pin Description
REV. 1.1.0
NAME
32-QFN
PIN #
TYPE
DESCRIPTION
Miscellaneous Signals
LOWPOWER
VCC
GND
2
O _{Low power status output. This pin will be asserted whenever the V1412 device is}
placed into the suspend state.
This pin is sampled momentarily at power-up or at any USB bus reset to configure the
polarity of the LOWPOWER output during suspend mode. An external (10K) pull-up
resistor will cause the LOWPOWER pin to be asserted HIGH during suspend mode.
An external (3.3K) pull-down resistor will cause the LOWPOWER pin to be asserted
LOW during suspend mode.
4, 13, 24, Pwr _{+3.3V power supply. (Note that all device inputs are 5V tolerant.)}
31, 32
1, 3, 14, Pwr _{Power supply common, ground.}
23, 27,
28
NOTE: Pin type: I=Input, O=Output, I/O= Input/output, OD=Output Open Drain.
6