STM32F334C8U6TR datasheet(81/125 Pages) STMICROELECTRONICS

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DS9994 Rev 9

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STM32F334x4 STM32F334x6 STM32F334x8

Electrical characteristics

103

Figure 24. I/O AC characteristics definition

6.3.15

NRST pin characteristics

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

resistor, RPU (see Table 50).

Unless otherwise specified, the parameters given in Table 53 are derived from tests

performed under ambient temperature and VDD supply voltage conditions summarized in

Table 19.

4. The I/O speed configuration is bypassed in FM+ I/O mode. Refer to the RM0364 reference manual for a description of FM+

I/O mode configuration.

ai14131d

10%

90%

50%

tr(IO)out

OUTPUT

EXTERNAL

ON CL

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

when loaded by CL specified in the table “

I/O AC characteristics”.

10%

50%

90%

tf(IO)out

Table 53. NRST pin characteristics

Symbol

Parameter

Conditions

Min.

Typ.

Max.

Unit

VIL(NRST)(1) NRST Input low level voltage

0.3VDD

+ 0.07(1)

VIH(NRST)(1) NRST Input high-level voltage

0.445VDD +

0.398(1)

Vhys(NRST) NRST Schmitt trigger voltage hysteresis

200

RPU

Weak pull-up equivalent resistor(2)

VIN = VSS

VF(NRST)(1) NRST Input filtered pulse

100(1)

VNF(NRST)(1) NRST Input not filtered pulse

500(1)

1. Guaranteed by design, not tested in production.

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)

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