DS1721
 
 
 
16 of 17
Capacitive Load for
each Bus Line
C
b
 
 
 
 
400
pF
8
Input Capacitance
C
I
 
 
 
5
 
pF
 
NOTES:
1.   All voltages are referenced to ground.
 
2.   I/O pins of fast mode devices must not obstruct the SDA and SCL lines if V
DD
 is switched off.
 
3.   I
DD
 specified with T
OUT
 pin open.
 
4.   I
DD
 specified with V
DD
 at 5.0V and SDA,SCL = 5.0V, 0癈 to 70癈.
 
5.   After this period, the first clock pulse is generated.
 
6.   The maximum t
HD:DAT
 has only to be met if the device does not stretch the LOW period (t
LOW
) of the
SCL signal.
 
7.   A fast mode device can be used in a standard mode system, but the requirement t
SU:DAT
 >250 ns must
then be met. This will automatically be the case if the device does not stretch the LOW period of the
SCL signal. If such a device does stretch the LOW period of the SCL signal, it must output the next
data bit to the SDA line t
R
 MAX+t
SU:DAT
 1000+250 = 1250 ns before the SCL line is released.
 
8.   C
b
 - total capacitance of one bus line in pF.
 
TIMING DIAGRAMS Figure 7 
 
 
 
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