參數(shù)資料
型號(hào): flas00xx
廠商: SIEMENS AG
英文描述: MultiMediaCard(多媒體卡)
中文描述: 多媒體卡(多媒體卡)
文件頁(yè)數(shù): 26/79頁(yè)
文件大小: 516K
代理商: FLAS00XX
MultiMediaCard Flash
Preliminary MultiMediaCard Product Manual;
1998 SANDISK CORPORATION
Page 26 of 79
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
capacities not to exceed 30 pF for up to 10 cards, and 40 pF for up to 30 cards, the
following values must not be exceeded:
Parameter
Symbol
Min.
Max.
Unit
Remark
Pull-up resistance
R
CMD
R
DAT
50
100
k
To prevent bus floating
Bus signal line capacitance
C
L
250
pF
f
PP
#
5 MHz,
30 cards
f
PP
#
20 MHz,
10 cards
Bus signal line capacitance
C
L
100
pF
Single card capacitance
C
CARD
7
pF
Maximum signal line inductance
16
nH
f
PP
#
20 MHz
4.4.1.1 Bus Signal Levels
As the bus can be supplied with a variable supply voltage, all signal levels are related to
the supply voltage.
Figure 4-5 Bus Signal Levels
4.4.1.1.1 Open-Drain Mode Bus Signal Level
Parameter
Symbol
Min.
Max.
Unit
Conditions
Output HIGH voltage
VOH
V
DD
-0.2
V
IOH = -100
μ
A
Output LOW voltage
0.3
V
IOL = 2mA
The input levels are identical with the push-pull mode bus signal levels.
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