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.
5
•
Bus Timing
Parameter
Symbol
Min
Max.
Unit
Remark
Clock CLK (All values are referred to min (V
IH
) and max (V
IL
)
Clock frequency Data Transfer Mode
f
PP
0 25
MHz
C
L
≤
100 pF, (7 cards)
Clock frequency Identification Mode
(The low freq. is required for MultiMediaCard
compatibility.)
f
OD
0 400
KHz
C
L
≤
250 pF, (21 cards)
t
WL
10 ns
C
L
≤
100 pF, (7 cards)
Clock low time
50 ns
C
L
≤
250 pF, (21 cards)
t
WH
10 ns
C
L
≤
100 pF, (7 cards)
Clock high time
50 ns
C
L
≤
250 pF, (21 cards)
t
TLH
10 ns
C
L
≤
100 pF, (7 cards)
Clock rise time
50
ns
C
L
≤
250 pF, (21 cards)
