43.20 UART AC Electrical Specifications

Table 43-28. UART AC Electrical Specifications
AC Characteristics				Standard Operating Conditions: V_DD = 1.9V to 3.6V (unless otherwise stated) Operating Temperature: -40°C ≤ T_A ≤ +85°C for Industrial Temp -40°C ≤ T_A ≤ +125°C for Extended Temp
Param. No.	Symbol	Characteristics		Min.	Typical	Max.	Units	Conditions
UT_1	F_BRATE	Baud rate	Asynchronous SAMPR = 16x mode	3.995	3.999	4.005	Mbps	C_LOAD = 30 pF_(MAX)
UT_3			Asynchronous SAMPR = 8x mode	7.981	7.993	7.981	Mbps	C_LOAD = 30 pF_(MAX)
UT_5			Asynchronous SAMPR = 3x mode	21.226	21.338	21.602	Mbps	C_LOAD = 30 pF_(MAX)
UT_6	T_LW	Baud clock period low time (Synchronous mode)		5	—	—	ns	—
UT_7	T_HW	Baud clock period high time (Synchronous mode)		5	—	—	ns	—
UT_8	T_S	Setup time before sampling edge		5	—	—	ns	—
UT_8	T_H	Hold time after sampling edge		5	—	—	ns	—
UT_26	F_ICK	Internal baud clock (Synchronous mode)		—	—	32	MHz	Maximum driven XCK of 32 MHz (DIV by 2 of internal clock (fixed pin)
UT_26	F_ICK	Internal baud clock (Synchronous mode)		—	—	32	MHz	Maximum driven XCK of 32 MHz (DIV by 2 of internal clock (PPS)
UT_26	F_XCK	External baud clock (Synchronous mode)		—	—	32	MHz	Maximum external XCK (fixed pin)
UT_26	F_XCK	External baud clock (Synchronous mode)		—	—	32	MHz	Maximum external XCK (PPS pin)
UT_22	F_USART	USART max GCLK_SERCOM (Synchronous mode)		—	—	32	MHz	Maximum driven XCK of 32 MHz (DIV by 2 of internal clock)
UT_24	F_XCK	USART external clock input (Synchronous mode)		—	—	32	MHz	Maximum external XCK
Note: These parameters are characterized but not tested in manufacturing.