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XR21V1414IM48TR-F Datasheet(PDF) 8 Page - Exar Corporation |
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XR21V1414IM48TR-F Datasheet(HTML) 8 Page - Exar Corporation |
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8 / 34 page  XR21V1414 8 4-CH FULL-SPEED USB UART REV. 1.3.0 NOTE: Pin type: I=Input, O=Output, I/O= Input/output, OD=Output Open Drain. Miscellaneous Signals LOWPOWER 2 O Low power status output. The LOWPOWER pin will be asserted whenever it is not safe to draw the amount of current from VBUS power requested in the Device Max Power field of the Configuration Descriptor. The LOW- POWER pin will behave differently for a low power device and a high power device. • Low-power device (<= 1 unit load or 100 mA i.e. bMaxPower <= 0x32): LOWPOWER pin is asserted when the USB UART is in suspend mode. • High-power deivce (bMaxPower > 0x32): LOWPOWER pin is asserted when the USB UART is in suspend mode or when it is not yet configured. The LOWPOWER pin will be de-asserted whenever it is safe to draw the amount of current requested in the Device Maximum Power field. 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. Power / Ground Signals VCC 5, 18, 33, 44, 45 Pwr +3.3V power supply. GND 1, 4, 19, 32, 40, 41 Pwr Power supply common, ground. Pin Description NAME 48-QFN PIN # TYPE DESCRIPTION |
Similar Part No. - XR21V1414IM48TR-F |
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Similar Description - XR21V1414IM48TR-F |
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