STM32F401CDU6 datasheet(114/135 Pages) STMICROELECTRONICS

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Electrical characteristics

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Figure 45. SD default mode

6.3.25

RTC characteristics

D, CMD

(output)

tOVD

tOHD

ai14888

Table 77. Dynamic characteristics: SD / MMC characteristics(1)(2)

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

fPP

Clock frequency in data transfer mode

MHz

SDIO_CK/fPCLK2 frequency ratio

8/3

tW(CKL)

Clock low time

fpp = 48MHz

8.5

tW(CKH)

Clock high time

fpp = 48MHz

8.3

CMD, D inputs (referenced to CK) in MMC and SD HS mode

tISU

Input setup time HS

fpp = 48MHz

3.5

tIH

Input hold time HS

fpp = 48MHz

CMD, D outputs (referenced to CK) in MMC and SD HS mode

tOV

Output valid time HS

fpp = 48MHz

4.5

tOH

Output hold time HS

fpp = 48MHz

CMD, D inputs (referenced to CK) in SD default mode

tISUD

Input setup time SD

fpp = 24MHz

1.5

tIHD

Input hold time SD

fpp = 24MHz

0.5

CMD, D outputs (referenced to CK) in SD default mode

tOVD

Output valid default time SD

fpp =24MHz

4.5

6.5

tOHD

Output hold default time SD

fpp =24MHz

3.5

1. Data based on characterization results, not tested in production.

2. VDD = 2.7 to 3.6 V.

Table 78. RTC characteristics

Symbol

Parameter

Conditions

Min

Max

-fPCLK1/RTCCLK frequency ratio

Any read/write operation

from/to an RTC register

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