STM32L021D4 datasheet(64/114 Pages) STMICROELECTRONICS

Part #	STM32L021D4

Description	Access line ultra-low-power 32-bit MCU Arm®-based Cortex®-M0, 16KB Flash, 2KB SRAM, 512B EEPROM, ADC, AES

PDF	114 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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Electrical characteristics

STM32L021x4

64/114

DocID027982 Rev 5

6.3.6

External clock source characteristics

High-speed external user clock generated from an external source

In bypass mode the input pin is a standard GPIO.The external clock signal has to respect

the I/O characteristics in Section 6.3.12. However, the recommended clock input waveform

is shown in Figure 18.

Figure 18. High-speed external clock source AC timing diagram

Table 34. High-speed external user clock characteristics(1)

1. Guaranteed by design, not tested in production.

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

fHSE_ext

User external clock source

frequency

CSS is ON or

PLL is used

MHz

CSS is OFF,

PLL not used

MHz

VHSEH

CK_IN input pin high level voltage

0.7VDD

-VDD

VHSEL

CK_IN input pin low level voltage

VSS

-0.3VDD

tw(HSE)

CK_IN high or low time

tr(HSE)

tf(HSE)

CK_IN rise or fall time

Cin(HSE)

CK_IN input capacitance

2.6

DuCy(HSE) Duty cycle

CK_IN Input leakage current

VSS ≤ VIN ≤ VDD

±1

µA

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