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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)