55.25 USART Electrical Specifications

Table 55-34. UART Electrical Specifications
AC CHARACTERISTICSStandard Operating Conditions: VDD = AVDD = 1.71V to 3.63V (unless otherwise stated)

Operating temperature:

-40°C ≤ TA ≤ +85°C for Industrial Temperature

Param. No.SymbolCharacteristicsMin.Typ.Max.UnitsConditions
UT_1FBRATEBaud RateAsynchronous SAMPR = 16x mode——FCLK_23/16MbpsVDD=1.8V or VDD=3.3V

FCLK_23: Refer to

Maximum Clock Frequencies Electrical Specifications

UT_3Asynchronous SAMPR = 8x mode——FCLK_23/8MbpsVDD=1.8V or VDD=3.3V

FCLK_23: Refer to

Maximum Clock Frequencies Electrical Specifications

UT_5Asynchronous SAMPR = 3x mode——FCLK_23/3MbpsVDD=1.8V or VDD=3.3V

FCLK_23: Refer to

Maximum Clock Frequencies Electrical Specifications

UT_19Synchronous Host Mode

(internal clock)

——7.5MbpsVDD=1.8V
——10VDD=3.3V
UT_21Synchronous Client Mode

(external clock)

——15MbpsVDD=1.8V
——20VDD=3.3V
UT_23FUSARTUSART max GCLK_SERCOM——FCLK_23MHzFCLK_23: Refer to Maximum Clock Frequencies Electrical Specifications
UT_25FXCKUSART External Clock Input——FCLK_45MHzFCLK_45: Refer to Maximum Clock Frequencies Electrical Specifications
Note:
  1. These parameters are characterized, but not tested in manufacturing.