SLSDM256BU STEC, SLSDM256BU Datasheet - Page 9

• Manufacturer Part Number: SLSDM256BU
• Manufacturer: STEC
• Type: MicroSD Cardr

Specifications of SLSDM256BU

• Density: 256MByte
• Operating Supply Voltage (typ): 3.3V
• Operating Temperature (min): 0C
• Operating Temperature (max): 70C
• Package Type: Not Required
• Pin Count: 8
• Operating Temperature Classification: Commercial
• Operating Supply Voltage (min): 2.7V
• Operating Supply Voltage (max): 3.6V
• Programmable: Yes
• Lead Free Status / RoHS Status: Compliant

SLSDMxxxB(I)U
3.2
The total capacitance C
capacitance C
this line: C
Requiring the sum of the host and bus capacitances not to exceed 30pF for up to 10 cards, and 40 pF for
up to 30cards, the values shown in Table 6 must not be exceeded:
Note: the total capacitance of CMD and DAT lines will be consist of C
they are connected separately to the SD Memory Card host.
Pull up resistance for CMD
Pull up resistance for DAT
Bus signal line capacitance
Bus signal line capacitance
Signal card capacitance
Signal line inductance
Pull up resistance inside
card (Pin 1)
Signal Loading
Parameter
L
= C
HOST
HOST
, the bus capacitance C
+ C
BUS
L
the CLK line of the SD memory card bus is the sum of the bus master
+ N*C
R
R
C
C
C
R
Symbol
CMD
DAT
L
L
CARD
DAT3
CARD
Figure 3: microSD Card Signal Loading
Table 6: microSD Card Signal Loading
where N is the number of connected cards.
61000-04581-104, July 2007
BUS
Min
10
10
10
itself and the capacitance C
Max
100
100
250
100
10
16
90
Industrial Grade microSD Card Datasheet
K ohms
K ohms
K ohms
Unit
nH
pF
pF
pF
HOST
To prevent bus floating
To prevent bus floating
Fpp<5MHz, 21 cards
Fpp<20MHz, 7 cards
Single card
May be used for card detection
CARD
, C
BUS
of each card connected to
and one C
Notes
CARD
only since
9