SPNS253A May 2018 – September 2019 TMS570LC4357-EP
PRODUCTION DATA.
The oscillator is enabled by connecting the appropriate fundamental resonator/crystal and load capacitors across the external OSCIN and OSCOUT pins as shown in Figure 5-3. The oscillator is a single-stage inverter held in bias by an integrated bias resistor. This resistor is disabled during leakage test measurement and low power modes.
NOTE
TI strongly encourages each customer to submit samples of the device to the resonator/crystal vendors for validation. The vendors are equipped to determine which load capacitors will best tune their resonator/crystal to the microcontroller device for optimum start-up and operation over temperature and voltage extremes.
An external oscillator source can be used by connecting a 3.3-V clock signal to the OSCIN terminal and leaving the OSCOUT terminal unconnected (open) as shown in Figure 5-3.