46.23 Universal Asynchronous Receiver/Transmitter (UART) Electrical Characteristics

Table 46-34. UART AC Electrical Specifications
AC CHARACTERISTICSStandard Operating Conditions: VDDREG = VDDIO = AVDD 1.71V to 3.63V (unless otherwise stated)

Operating temperature:

-40°C ≤ TA ≤ +85°C for Industrial

Param. No.SymbolCharacteristicsMin.Typ.Max.UnitsConditions
UT_1AFBRATEBaud Rate - Normal Speed SERCOMAsynchronous SAMPR = 16x mode——10MbpsVDDIO = 3.3V, CLOAD = 30 pF(max)
——10MbpsVDDIO = 1.8V, CLOAD = 30 pF(max)
UT_3AAsynchronous SAMPR = 8x mode——20MbpsVDDIO = 3.3V, CLOAD = 30 pF(max)
——20MbpsVDDIO = 1.8V, CLOAD = 30 pF(max)
UT_5AAsynchronous SAMPR = 3x mode——21MbpsVDDIO = 3.3V, CLOAD = 30 pF(max)
——20MbpsVDDIO = 1.8V, CLOAD = 30 pF(max)
UT_19ASynchronous Mode X2 mode——18MbpsVDDIO = 3.3V, CLOAD = 30 pF(max)
——12MbpsVDDIO = 1.8V, CLOAD = 30 pF(max)
UT_21ASynchronous Mode X1 mode——18MbpsVDDIO = 3.3V, CLOAD = 30 pF(max)
——12MbpsVDDIO = 1.8V, CLOAD = 30 pF(max)
UT_1BFBRATE_HSBaud Rate - High Speed SERCOMAsynchronous SAMPR = 16x mode——10MbpsVDDIO = 3.3V, CLOAD = 30 pF(max)
——10MbpsVDDIO = 1.8V, CLOAD = 30 pF(max)
UT_3BAsynchronous SAMPR = 8x mode——20MbpsVDDIO = 3.3V, CLOAD = 30 pF(max)
——20MbpsVDDIO = 1.8V, CLOAD = 30 pF(max)
UT_5BAsynchronous SAMPR = 3x mode——21MbpsVDDIO = 3.3V, CLOAD = 30 pF(max)
——20MbpsVDDIO = 1.8V, CLOAD = 30 pF(max)
UT_19BSynchronous Mode X2 mode——21MbpsVDDIO = 3.3V, CLOAD = 30 pF(max)
——21MbpsVDDIO = 1.8V, CLOAD = 30 pF(max)
UT_21BSynchronous Mode X1 mode——21MbpsVDDIO = 3.3V, CLOAD = 30 pF(max)
——21MbpsVDDIO = 1.8V, CLOAD = 30 pF(max)
UT_23FUSARTUSART max GCLK_SERCOM——FCLK_23MHz—
UT_25FXCKUSART External Clock Input——25MHz—