Datasheet

Electrical characteristics STM32F401xD STM32F401xE
114/135
Figure 45. SD default mode
6.3.25 RTC characteristics
CK
D, CMD
(output)
t
OVD
t
OHD
ai14888
Table 77. Dynamic characteristics: SD / MMC characteristics
(1)(2)
Symbol Parameter Conditions Min Typ Max Unit
f
PP
Clock frequency in data transfer mode 0 - 48 MHz
- SDIO_CK/fPCLK2 frequency ratio - - 8/3 -
t
W(CKL)
Clock low time fpp = 48MHz 8.5 9 -
ns
t
W(CKH)
Clock high time fpp = 48MHz 8.3 10 -
CMD, D inputs (referenced to CK) in MMC and SD HS mode
t
ISU
Input setup time HS fpp = 48MHz 3.5 - -
ns
t
IH
Input hold time HS fpp = 48MHz 0 - -
CMD, D outputs (referenced to CK) in MMC and SD HS mode
t
OV
Output valid time HS fpp = 48MHz - 4.5 7
ns
t
OH
Output hold time HS fpp = 48MHz 3 - -
CMD, D inputs (referenced to CK) in SD default mode
t
ISUD
Input setup time SD fpp = 24MHz 1.5 - -
ns
t
IHD
Input hold time SD fpp = 24MHz 0.5 - -
CMD, D outputs (referenced to CK) in SD default mode
t
OVD
Output valid default time SD fpp =24MHz - 4.5 6.5
ns
t
OHD
Output hold default time SD fpp =24MHz 3.5 - -
1. Data based on characterization results, not tested in production.
2. V
DD
= 2.7 to 3.6 V.
Table 78. RTC characteristics
Symbol Parameter Conditions Min Max
-f
PCLK1
/RTCCLK frequency ratio
Any read/write operation
from/to an RTC register
4-
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