49.28 USB AC Electrical Specifications

Table 49-37. USB AC Electrical Specifications
AC Characteristics			Standard Operating Conditions: VDD33 = VDDIO = AVDD = 1.9–3.6V (Unless Otherwise Stated) Operating Temperature: -40°C ≤ TA ≤ +125°C for Extended Temperature
Parameter Number	Symbol	Characteristics⁽²⁾	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
VBUS Supply
USB_7	VILUSB	Input Low Voltage for USB Buffer	—	—	DI_1	V	—
USB_9	VIHUSB	Input High Voltage for USB Buffer	DI_3	—	—	V	—
USB_11	VDIFS	Differential Input Sensitivity	0.2	—	—	V	The difference between D+ and D- must exceed this value while VCM is met
USB_13	VCM	Differential Common Mode Range	0.8	—	2.5	V	VUSB = 3.0–3.6V
USB_15	ZOUT	Driver Output Impedance	28	—	44	W	—
USB_17	VOLUSB	Voltage Output Low	—	—	DI_5	V	1.425 kW load connected to VUSB = 3.6V
USB_19	VOHUSB	Voltage Output High	DI_9	—	—	V	14.25 kW load connected to ground w/VUSB = 3.0V
USB_21	VBUS	USB VBUS Input range		—	5.5	V	—
USB_23	USBCLKS⁽¹⁾	USB Clock Source⁽¹⁾GCLK_USB of 48 MHz	—	48	—	MHz	fUPLL = 96 MHz⁽¹⁾
Note: External Crystal oscillator (POSC) as input clock source to UPLL for fUPLL of 96 MHz which is divided by 2 to get USBCLKS = 48 MHz. Required clock accuracy: Full Speed = ±0.25% (2500 ppm), Low Speed = ±1.5% (15000 ppm). These parameters are characterized, but not tested in manufacturing.