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128MB~2GB SD80 Cards
Transcend Information Inc.
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 V
DD
of the allowed voltage range:
Parameter Symbol Min. Max. Unit Remark
Output HIGH voltage V
OH
0.75* V
DD
V I
OH
= -100 μA @V
DD
min
Output LOW voltage V
OL
0.125* V
DD
V I
OL
= -100 μA @V
DD
min
Input HIGH voltage V
IH
0.625* V
DD
V
DD
+ 0.3 V
Input LOW voltage V
IL
V
SS
– 0.3 0.25* V
DD
V