STM32U073R8 datasheet(86/146 Pages) STMICROELECTRONICS

86 / 146 page

Speed

Symbol

Parameter

Conditions

Min

Max

Unit

Fmax

Maximum frequency

C=50 pF, 2.7 V≤VDDIOx≤3.6 V

MHz

C=50 pF, 1.62 V≤VDDIOx≤2.7 V

C=10 pF, 2.7 V≤VDDIOx≤3.6 V

100(1)

C=10 pF, 1.62 V≤VDDIOx≤2.7 V

37.5

Tr/Tf

Output rise and fall time

C=50 pF, 2.7 V≤VDDIOx≤3.6 V

5.8

C=50 pF, 1.62 V≤VDDIOx≤2.7 V

C=10 pF, 2.7 V≤VDDIOx≤3.6 V

2.5

C=10 pF, 1.62 V≤VDDIOx≤2.7 V

Fmax

Maximum frequency

C=30 pF, 2.7 V≤VDDIOx≤3.6 V

120(1)

MHz

C=30 pF, 1.62 V≤VDDIOx≤2.7 V

C=10 pF, 2.7 V≤VDDIOx≤3.6 V

180(1)

C=10 pF, 1.62 V≤VDDIOx≤2.7 V

Tr/Tf

Output rise and fall time

C=30 pF, 2.7 V≤VDDIOx≤3.6 V

3.3

C=30 pF, 1.62 V≤VDDIOx≤2.7 V

Fm+

Fmax

Maximum frequency

C=50 pF, 1.62 V≤VDDIOx≤3.6 V

MHz

Output fall time(2)

1. This value represents the I/O capability but the maximum system frequency is limited to 56 MHz.

2. The fall time is defined between 70% and 30% of the output waveform accordingly to I2C specification.

Figure 24. I/O AC characteristics definition

Maximum frequency is achieved with a duty cycle at (45 - 55%) when loaded by the

specified capacitance.

10%

50%

90%

10%

50%

90%

r(IO)out

f(IO)out

1. Refer to Table 66. I/O AC characteristics.

6.3.15

NRST pin characteristics

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

Unless otherwise specified, the parameters given in the table below are derived from tests performed under the

ambient temperature and supply voltage conditions summarized in Section 6.3.1: General operating conditions.

Table 67. NRST pin characteristics

Specified by design, not tested in production.

STM32U073x8/B/C

Electrical characteristics

DS14548 - Rev 2

page 86/146

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