51.29 Universal Serial Bus (USB) Electrical Specifications

Table 51-41. USB Full-Speed/Low-Speed AC Electrical Specifications
AC CHARACTERISTICS			Standard Operating Conditions: VDDIO 3.0V to 3.6V (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 ⁽⁴⁾	USB Transceiver Voltage	3	—	3.6	V	Voltage on VDDIOx must be in this range for proper USB operation
Clocks
USB_23	USBFSCLKS ⁽²⁾	USBFS Clock Source	—	48	—	MHz	fGCLK_USBFS = 48 MHz
USB_24	USBHSCLKS ⁽³⁾	USBHS Clock Source	—	12 or 24	—	MHz	—
USB_25	USBFSAHB	Min. AHB Clock for USBFS Operations	12	—	—	MHz	—
USB_26	USBHSAHB	Min. AHB Clock for USBHS Operations	60	—	—	MHz	—
Note: USBFS: Supports Full and Low-Speed communication. Compliant with USB 2.0 specification. USBHS: Supports High, Full and Low-Speed communication. Compliant with USB 2.0 specification. USBFS: Required clock accuracy: Full-Speed = ±0.25%, Low-Speed = ±1.5% . USBHS: XOSC clock source. Required clock accuracy: ±0.05% for all Speeds.

Table 51-42. USB Full-Speed/Low-Speed Clock Configuration
USBFS Clock configuration			Standard Operating Conditions: VDDIO 3.0V to 3.6V (unless otherwise stated) Operating temperature: -40°C ≤ TA ≤ +85°C for Extended Temp
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 XOSC	Yes	Yes
		XOSC Crystal	Yes	Yes