STM32F334X4 datasheet(78/115 Pages) STMICROELECTRONICS

Part #	STM32F334X4

Description	ARMCortex-M4 32b MCUFPU,up to 64KB Flash,16KB SRAM, 2 ADCs,3 DACs,3 comp.,op-amp, 217ps 10-ch (HRTIM1)

PDF	115 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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78 / 115 page

Electrical characteristics

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DocID025409 Rev 5

Figure 22. 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.

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)

STM32F334X4 Datasheet(PDF) 78 Page - STMicroelectronics