Datasheet

Electrical characteristics STM32L431xx
166/200 DocID028800 Rev 1
Figure 39. SAI slave timing waveforms
SDMMC characteristics
Unless otherwise specified, the parameters given in Table 86 for SDIO are derived from
tests performed under the ambient temperature, f
PCLKx
frequency and V
DD
supply voltage
conditions summarized in
Table 21: General operating conditions, with the following
configuration:
• Output speed is set to OSPEEDRy[1:0] = 11
• Capacitive load C = 30 pF
• Measurement points are done at CMOS levels: 0.5  V
DD
Refer to Section 6.3.14: I/O port characteristics for more details on the input/output
characteristics.
Table 86. SD / MMC dynamic characteristics, V
DD
=2.7 V to 3.6 V
(1)
Symbol Parameter Conditions Min Typ Max Unit
f
PP
Clock frequency in data transfer mode - 0 - 50 MHz
- SDIO_CK/fPCLK2 frequency ratio - - - 4/3 -
t
W(CKL)
Clock low time f
PP
= 50 MHz 8 10 - ns
t
W(CKH)
Clock high time f
PP
= 50 MHz 8 10 - ns
CMD, D inputs (referenced to CK) in MMC and SD HS mode
t
ISU
Input setup time HS f
PP
= 50 MHz 3.5 - - ns
t
IH
Input hold time HS f
PP
= 50 MHz 2.5 - - ns
CMD, D outputs (referenced to CK) in MMC and SD HS mode
t
OV
Output valid time HS f
PP
= 50 MHz - 12 13 ns
t
OH
Output hold time HS f
PP
= 50 MHz 10 - - ns
CMD, D inputs (referenced to CK) in SD default mode
t
ISUD
Input setup time SD f
PP
= 50 MHz 3.5 - - ns
t
IHD
Input hold time SD f
PP
= 50 MHz 3 - - ns
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