STM32L151X8 datasheet(70/133 Pages) STMICROELECTRONICS

Part #	STM32L151x8

Description	Ultra-low-power 32-bit MCU ARM®-based Cortex®-M3, 128KB Flash, 16KB SRAM, 4KB EEPROM, LCD, USB, ADC, DAC

PDF	133 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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70 / 133 page

Electrical characteristics

STM32L151x6/8/B STM32L152x6/8/B

70/133

DocID17659 Rev 12

6.3.6

External clock source characteristics

High-speed external user clock generated from an external source

In bypass mode the HSE 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 6.3.13. However, the

recommended clock input waveform is shown in Figure 15: High-speed external clock

source AC timing diagram.

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

Table 26. High-speed external user clock characteristics(1)

1. Guaranteed by design.

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

fHSE_ext

User external clock source

frequency

CSS is on or

PLL is used

832

MHz

CSS is off, PLL

not used

VHSEH

OSC_IN input pin high level voltage

0.7VDD

-VDD

VHSEL

OSC_IN input pin low level voltage

VSS

-0.3VDD

tw(HSEH)

tw(HSEL)

OSC_IN high or low time

tr(HSE)

tf(HSE)

OSC_IN rise or fall time

Cin(HSE)

OSC_IN input capacitance

2.6

DuCy(HSE) Duty cycle

OSC_IN Input leakage current

VSS ≤VIN ≤VDD

±1

µA

STM32L151x8 Datasheet(PDF) 70 Page - STMicroelectronics

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