T
T
T
S
S
S
1
1
1
G
G
G
~
~
~
2
2
2
G
G
G
S
S
S
D
D
D
G
G
G
Secure Digital Card
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
μ
A @V
DD
min
Output LOW voltage
V
OL
0.125
*
V
DD
V I
OL
= -100
μ
A @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
