STM32F373C8 datasheet(74/131 Pages) STMICROELECTRONICS

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Electrical characteristics

STM32F37xxx

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DocID022691 Rev 4

Figure 13. Low-speed external clock source AC timing diagram

High-speed external clock generated from a crystal/ceramic resonator

The high-speed external (HSE) clock can be supplied with a 4 to 32 MHz crystal/ceramic

resonator oscillator. All the information given in this paragraph are based on design

simulation results obtained with typical external components specified in Table 40. In the

application, the resonator and the load capacitors have to be placed as close as possible to

the oscillator pins in order to minimize output distortion and startup stabilization time. Refer

to the crystal resonator manufacturer for more details on the resonator characteristics

(frequency, package, accuracy).

Table 40. HSE oscillator characteristics

Symbol

Parameter

Conditions(1)

1. Resonator characteristics given by the crystal/ceramic resonator manufacturer.

Min(2)

Typ Max(2)

2. Guaranteed by design, not tested in production.

Unit

fOSC_IN Oscillator frequency

MHz

Feedback resistor

200

IDD

HSE current consumption

During startup(3)

3. This consumption level occurs during the first 2/3 of the

tSU(HSE) startup time

8.5

VDD = 3.3 V, Rm= 30 Ω,

CL= 10 pF@8 MHz

-0.4

VDD = 3.3 V, Rm= 45 Ω,

CL= 10 pF@8 MHz

-0.5

VDD = 3.3 V, Rm= 30 Ω,

CL=5 pF@32 MHz

-0.8

VDD = 3.3 V, Rm= 30 Ω,

CL= 10 pF@32 MHz

-1

VDD = 3.3 V, Rm= 30 Ω,

CL= 20 pF@32 MHz

-1.5

Oscillator transconductance

Startup

mA/V

tSU(HSE)(4)

4. tSU(HSE) is the startup time measured from the moment it is enabled (by software) to a stabilized 8 MHz

oscillation is reached. This value is measured for a standard crystal resonator and it can vary significantly

with the crystal manufacturer

Startup time

VDD is stabilized

MS19215V2

VLSEH

tf(LSE)

90%

10%

TLSE

tr(LSE)

VLSEL

tW(LSEH)

tW(LSEL)

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