STM32F303RBT7 データシートの表示（PDF） - STMicroelectronics

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STM32F303RBT7

ARM Cortex-M4F 32b MCU+FPU, up to 256KB Flash+48KB SRAM 4 ADCs, 2 DAC ch., 7 comp, 4 PGA, timers, 2.0-3.6 V operation

STMicroelectronics 

STM32F302xx/STM32F303xx

Electrical characteristics

Low-speed external user clock generated from an external source

In bypass mode the LSE oscillator is switched off and the input pin is a standard GPIO. The

external clock signal has to respect the I/O characteristics in Section 6.3.14. However, the

recommended clock input waveform is shown in Figure 15

Table 39. Low-speed external user clock characteristics

Symbol

Parameter

Conditions

Min

Typ

Max Unit

fLSE_ext

User External clock source

frequency(1)

VLSEH

OSC32_IN input pin high level

voltage

VLSEL

OSC32_IN input pin low level

voltage

tw(LSEH)

tw(LSEL)

tr(LSE)

tf(LSE)

OSC32_IN high or low time(1)

OSC32_IN rise or fall time(1)

1. Guaranteed by design, not tested in production.

-

32.768 1000 kHz

0.7VDD

-

VDD

V

VSS

-

0.3VDD

450

-

-

-

-

ns

50

Figure 15. Low-speed external clock source AC timing diagram

6,3%(

6,3%,





TR,3%

T7,3%(

TF,3%

4,3%

T7,3%,

T

-36

Doc ID 023353 Rev 5

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