STM32F103C4 datasheet(62/90 Pages) STMICROELECTRONICS

Il numero della parte	STM32F103C4

Spiegazioni elettronici	Low-density performance line, ARM-based 32-bit MCU with 16 or32 KB Flash, USB

PDF	90 Pages

Scroll/Zoom	100%

Produttore elettronici	STMICROELECTRONICS [STMicroelectronics]

Homepage	http://www.st.com

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62 / 90 page

Electrical characteristics

STM32F103x4, STM32F103x6

62/90

Doc ID 15060 Rev 6

Figure 27.

I/O AC characteristics definition

5.3.14

NRST pin characteristics

The NRST pin input driver uses CMOS technology. It is connected to a permanent pull-up

resistor, RPU (see Table 35).

Unless otherwise specified, the parameters given in Table 38 are derived from tests

performed under the ambient temperature and VDD supply voltage conditions summarized

in Table 9.

ai14131

10%

90%

50%

tr(IO)out

External

Output

on 50pF

Maximum frequency is achieved if (tr + tf) 2/3)T and if the duty cycle is (45-55%)

10%

50%

90%

when loaded by 50 pF

tr(IO)out

Table 38.

NRST pin characteristics

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

VIL(NRST)

(1)

Guaranteed by design, not tested in production.

NRST Input low level voltage

–0.5

0.8

VIH(NRST)

(1)

NRST Input high level voltage

VDD+0.5

Vhys(NRST)

NRST Schmitt trigger voltage

hysteresis

200

RPU

Weak pull-up equivalent resistor(2)

The pull-up is designed with a true resistance in series with a switchable PMOS. This PMOS contribution

to the series resistance must be minimum

(~10% order)

VIN = VSS

VF(NRST)

(1)

NRST Input filtered pulse

100

VNF(NRST)

(1)

NRST Input not filtered pulse

300

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