XR21V1410IL16TR-F from MaxLinear, in a QFN-16-EP(3x3). Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin	Name	Type	Function
1	GND	power_in	Power supply common, ground reference for the device.
2	LOWPOWER	output	Low-power status output. Asserted when the host has not yet granted the amount of VBUS current requested in bMaxPower, or during USB suspend. Polarity in suspend is selected at power-up by an external 10 kΩ pull-up (asserts HIGH) or 3.3 kΩ pull-down (asserts LOW).
3	GPIO5/RTS#/RS485	bidirectional	General-purpose I/O, UART Request-to-Send output (active low), or Auto RS-485 half-duplex driver-enable control. Internal pull-up (disabled during suspend); an external pull-up is recommended if used as an input to minimize suspend current.
4	GPIO4/CTS#	bidirectional	General-purpose I/O or UART Clear-to-Send input (active low). Internal pull-up disabled during suspend; add external pull-up if used as an input to minimize suspend current.
5	GPIO3/DTR#	bidirectional	General-purpose I/O or UART Data-Terminal-Ready output (active low). Configured as output by default under the CDC-ACM driver. Internal pull-up disabled during suspend.
6	GPIO2/DSR#	bidirectional	General-purpose I/O or UART Data-Set-Ready input (active low). Internal pull-up disabled during suspend; add external pull-up if used as an input.
7	GPIO1/CD#	bidirectional	General-purpose I/O or UART Carrier-Detect input (active low). Internal pull-up disabled during suspend; add external pull-up if used as an input.
8	GPIO0/RI#/RWK#	bidirectional	General-purpose I/O, UART Ring-Indicator input (active low), or Remote-Wakeup input. A high-to-low transition while suspended requests USB remote wakeup. Internal pull-up disabled during suspend.
9	TX	output	UART Channel A transmit data output.
10	RX	input	UART Channel A receive data input. Has an internal pull-up resistor that is NOT disabled during suspend mode.
11	SDA	bidirectional	I2C serial data (open-drain) for an optional external EEPROM storing USB VID/PID and other defaults. Requires a 4.7-10 kΩ pull-up. If no EEPROM is used, sampled at power-up together with SCL to select Remote-Wakeup support and Self/Bus-powered mode (see Table 2).
12	SCL	bidirectional	I2C serial clock (open-drain) for an optional external EEPROM. Requires a 4.7-10 kΩ pull-up. If no EEPROM is used, sampled at power-up together with SDA to select Remote-Wakeup support and Self/Bus-powered mode (see Table 2).
13	GND	power_in	Power supply common, ground reference for the device.
14	USBD-	bidirectional	USB 2.0 Full-Speed differential data minus.
15	USBD+	bidirectional	USB 2.0 Full-Speed differential data plus. Has an internal 1.5 kΩ pull-up that signals full-speed attach to the host.
16	VCC	power_in	+3.3 V power supply input.
17	GND (Center Pad)	power_in	Exposed metallic center pad on the back of the QFN package. Must be connected to the PCB GND plane; a solder-mask-defined thermal pad approximately the size of the exposed pad is recommended for both thermal and electrical grounding.

Key specifications

Parameter	Value
Manufacturer	MaxLinear
Package	QFN-16-EP(3x3)
Category	Interface
Pins	17

Ordering variants

Same part, different packaging or reel option.

XR21V1410IL16-F
XR21V1410IL16TR-F

CAD (KiCad official)

Symbol: XR21V1410IL16TR-F
Footprint: Package_DFN_QFN:QFN-16-1EP_3x3mm_P0.5mm_EP1.7x1.7mm
3D model: QFN-16-EP(3x3) (KiCad packages3D, STEP)

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

Datasheet: MaxLinear datasheet (31 pp, sha256 c6b7a0ff0d56cb9c, retrieved 2026-08-17, tier: manufacturer)
Extractor: ds2sf (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF