ESSDC256 datasheet(3/6 Pages) EOREX

3 / 6 page

64MB/128MB/256MB/512MB Secure Digital Card

Eorex Corporation

www.eorex.com

3/6

Bus Operating Conditions

1. General

Parameter

Symbol

Min.

Max.

Unit

Remark

Peak voltage on all lines

-0.3

VDD+0.3

All Inputs

Input Leakage Current

-10

µA

All Outputs

Output Leakage Current

-10

µA

2. Power Supply Voltage

Parameter

Symbol

Min

Max

Unit

Remark

Supply voltage

VDD

2.0

3.6

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

Power up time

250

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

Min

Max

Unit

Remark

Bus signal line capacitance

100

fpp≦20MHz, 7 cards

Signal card capacitance

CCARD

Maximum signal line inductance

fpp≦20MHz

Pull-up resistance inside card (pin1)

RDAT3

KΩ

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

Symbol

Min

Max

Unit

Remark

Pull-up resistance

RCMD, RDAT

100

KΩ

To prevent bus floating

Bus signal line capacitance

250

fpp≦5MHz, 21 cards

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