SanDisk SD064 Electrical Interface, Physical / Mechanical, Power Up, Bus Operating Conditions

connect external pullup resistors to all data lines even if only DAT0 is to be used. Otherwise, non-expected high current consumption may occur due to the floating inputs of DAT1 and DAT2 (in case they are not used).

For more details regarding the SD Bus topology, refer to Section 3.5.1 of the SDA Physical Layer Specification, Version 2.00.

For more details regarding the SPI Bus topology, refer to Section 3.5.2 of the SDA Physical Layer Specification, Version 2.00.

3.5 Electrical Interface

The power scheme of SanDisk SD products is handled locally in each card and in the bus master. Refer to Section 6.4 of the SDA Physical Layer Specification, Version 2.00.

3.5.1 Power Up

Refer to Section 6.4.1 of the SDA Physical Layer Specification, Version 2.00, for information about power sequencing.

3.5.2 Bus Operating Conditions

SPI Mode bus operating conditions are identical to SD Card Bus Mode operating conditions. For details, see Section 6.6 of the SDA Physical Layer Specification, Version 2.00.

3.5.3 Bus Timing

SanDisk SD-ROM cards operate at a maximum clock frequency of 25MHz. See Section 6.7 of the SDA Physical Layer Specification, Version 2.00, for bus timing specifications.

3.6 Physical / Mechanical

The following table specifies the physical attributes of the SanDisk SD Card.

Parameter	Value	Notes
Weight	2.0g maximum
Length	32mm +/- 0.1mm
Width	24mm +/- 0.1mm
Thickness	2.1mm +/- 0.15mm

SanDisk SD-ROM Cards are available in an SD card compatible form factor without a physical (sliding) write-protect switch. As shown in the following package diagram, the SD-ROM Card package has the write-protect "notch” in the write-enabled position, even though the card itself is read-only.

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