55.25 USART Electrical Specifications

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

Operating temperature:

-40°C ≤ TA ≤ +85°C for Industrial Temperature
Param. No. Symbol Characteristics Min. Typ. Max. Units Conditions
UT_1 FBRATE Baud Rate Asynchronous SAMPR = 16x mode — — FCLK_23/16 Mbps VDD=1.8V or VDD=3.3V

FCLK_23: Refer to

Maximum Clock Frequencies Electrical Specifications
UT_3 Asynchronous SAMPR = 8x mode — — FCLK_23/8 Mbps VDD=1.8V or VDD=3.3V

FCLK_23: Refer to

Maximum Clock Frequencies Electrical Specifications
UT_5 Asynchronous SAMPR = 3x mode — — FCLK_23/3 Mbps VDD=1.8V or VDD=3.3V

FCLK_23: Refer to

Maximum Clock Frequencies Electrical Specifications
UT_19 Synchronous Host Mode

(internal clock)

 — — 7.5 Mbps VDD=1.8V
— — 10 VDD=3.3V
UT_21 Synchronous Client Mode

(external clock)

 — — 15 Mbps VDD=1.8V
— — 20 VDD=3.3V
UT_23 FUSART USART max GCLK_SERCOM — — FCLK_23 MHz FCLK_23: Refer to Maximum Clock Frequencies Electrical Specifications
UT_25 FXCK USART External Clock Input — — FCLK_45 MHz FCLK_45: Refer to Maximum Clock Frequencies Electrical Specifications
Note:
  1. These parameters are characterized, but not tested in manufacturing.