46.27 Universal Serial Bus (USB) Electrical Characteristics

Table 46-39. USB AC Electrical Specifications
AC CHARACTERISTICS			Standard Operating Conditions: VDDIO 3.0V to 3.63V (unless otherwise stated) Operating temperature: -40°C ≤ TA ≤ +85°C for Industrial
Param. No.	Symbol	Characteristics⁽¹⁾	Min.	Typ.	Max.	Units	Conditions
USB_1	VDDUSB	USB Transceiver Voltage	3	—	3.6	V	Voltage on VDDIOx must be in this range for proper USB operation
Clocks
USB_23	USBCLKS ⁽²⁾	USB Clock Source	—	48	—	MHz	fGCLK_USBFS = 48 MHz
USB_25	USBAHB	Min. AHB Clock for USB Operations	12	—	—	MHz
Note: Supports Full and Low-Speed communication. Compliant with USB 2.0 specification. Required clock accuracy: Full-Speed = ±0.25%, Low-Speed = ±1.5%.

Table 46-40. USB FS/LS AC Electrical Specifications
USB FS/LS Clock configuration			Standard Operating Conditions: VDDIO 3.0V to 3.63V (unless otherwise stated) Operating temperature: -40°C ≤ TA ≤ +85°C for Industrial
Param. No.	Symbol	Characteristics	Device Mode Operation	Host Mode Operation
USB_30	USBFS_GCLK_SRC	DFLL48M Open loop	No	No
		DFLL48M Close loop, Ref. internal OSC source	No	No
		DFLL48M Close loop, Ref. external XOSC / XOSC32K source	Yes	No
		DFLL48M Close loop, Ref. SOF (USB recovery mode)	Yes	N/A
		PLL internal OSC (DFLL48M)	No	No
		PLL external OSC	Yes	Yes
		XOSC Crystal	Yes	Yes