SLSDM256BU STEC, SLSDM256BU Datasheet - Page 5

• 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
1.2
Notes:
1. The extended DAT lines (DAT1-DAT3) are input on power up. They start to operate as DAT lines
2. After power up the CD line is input with 50KOhm pull-up (can be used for card detection or SPI mode
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
Pin
Pin
after SET_BUS_WIDTH command. The Host shall keep its own DAT1-DAT3 lines in input mode, as
well, while they are not used. It is defined so, in order to keep compatibility to MultiMediaCards.
selection). The pull-up should be disconnected by the user, during regular data transfer, with
SET_CLR_CARD_DETECT (ACMD42) command.
Pin Assignment and Signal Description
DAT2
CD, DAT3
CMD
VDD
CLK
VSS
DAT0
DAT1
—
/CS
DI
VDD
CLK
VSS
DO
—
Signal Name
Signal Name
Table 2: microSD Card Pin Assignment and Signal Description
Bi-directionally I/O,
I/O using Push-Pull Drivers
Bi-directionally I/O,
I/O using Push-Pull Drivers
I/O using Push-Pull Drivers
Supply
Input
Supply
Bi-directionally I/O,
I/O using Push-Pull Drivers
Bi-directionally I/O,
I/O using Push-Pull Drivers
—
Input
Input
Supply
Input
Supply
Output,
I/O using Push Pull Drivers
—
Pin Type
Pin Type
61000-04581-104, July 2007
microSD Mode
SPI Mode
Industrial Grade microSD Card Datasheet
Command/Response
Data line bit 2.
For read only cards, DAT2 is output only.
Card Detect, Data line bit 3. See Notes 1 and 2.
Supply voltage
Clock
Supply voltage ground
Data line bit 0.
For read only cards, DAT0 is output only.
Data line bit 1.
For read only cards, DAT1 is output only.
Reserved for future use.
Host should pull up with 10 to 100K ohm resistance.
Chip select (“/” indicates low active)
Data in
Supply voltage
Clock
Supply voltage ground
Data out
Reserved for future use.
Host should pull up with 10 to 100K ohm resistance.
Description
Description
5