64MB/128MB/256MB/512MB Secure Digital Card
Bus Operating Conditions
1. General
Parameter
Peak voltage on all lines
All Inputs
Symbol
Min.
-0.3
Max.
Unit
V
Remark
VDD+0.3
Input Leakage Current
All Outputs
-10
-10
10
10
µA
µA
Output Leakage Current
2. Power Supply Voltage
Parameter
Symbol
VDD
Min
2.0
Max
3.6
Unit
V
Remark
Supply voltage
CMD0, 12, 55, ACMD41
commands
Supply voltage specified in OCR register
Except CMD0, 15, 55,
ACMD41 commands
Supply voltage differentials (VSS1, VSS2
)
-0.3
0.3
V
Power up time
250
ms
From 0V to VDD Min.
Note: The current consumption of any card during the power-up procedure must not exceed 10mA.
3. Bus Signal Line Load
The total capacitance CL of each line of the MultiMediaCard bus is the sum of the bus master
capacitance CHOST, the bus capacitance CBUS itself and the capacitance CCARD of each card
connected to this line:
CL = CHOST + CBUS + N* CCARD
Where N is the number of connected cards. Requiring the sum of the host and bus
capacitance’s not to exceed 30pF for up to 10 cards, and 40pF up to 30 cards, the following
values must not be exceeded:
Parameter
Symbol
CL
Min
10
Max
100
10
Unit
pF
Remark
fpp≦20MHz, 7 cards
Bus signal line capacitance
Signal card capacitance
CCARD
pF
fpp≦20MHz
Maximum signal line inductance
Pull-up resistance inside card (pin1)
16
nH
KΩ
RDAT3
90
May be used for card
detection
Note that the total capacitance of CMD and DAT lines will be consist of CHOST, CBUS and one CCARD
only since they are connected separately to the SD Memory Card host.
Parameter
Pull-up resistance
Symbol
RCMD, RDAT
CL
Min
10
Max
100
250
Unit
KΩ
pF
Remark
To prevent bus floating
fpp≦5MHz, 21 cards
Bus signal line capacitance
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