64MB/128MB/256MB/512MB Secure Digital Card
4. Bus Signal Levels
As the bus can be supplied with a variable supply voltage, all signal levels are related
to the supply voltage.
To meet the requirements of the JEDEC specification JESD8-1A, the card input and
output voltages shall be within the following specified ranges for any VDD of the allowed
voltage range:
Parameter
Symbol
VOH
Min
Max
Unit
V
Remark
Output HIGH voltage
Output LOW voltage
Input HIGH voltage
Input LOW voltage
IOH=-100µA @VDD min
IOL=-100µA @VDD min
0.75* VDD
VOL
V
0.125* VDD
VDD+0.3
VIH
V
0.625* VDD
VSS-0.3
VIL
V
0.25* VDD
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