Typical operating characteristics – Rainbow Electronics DS1087L User Manual
Page 5
DS1087L
3.3V Spread-Spectrum EconOscillator
_____________________________________________________________________
5
Note 1:
All voltages are referenced to ground.
Note 2:
This is the absolute accuracy of the master oscillator frequency at the default settings.
Note 3:
This is the change that is observed in master oscillator frequency with changes in voltage from nominal voltage at
T
A
= +25°C.
Note 4:
This is the percentage frequency change from the +25°C frequency due to temperature at V
CC
= 3.3V.
Note 5:
The dither deviation of the master oscillator frequency is unidirectional and lower than the undithered frequency.
Note 6:
This indicates the time elapsed between power-up and the output becoming active. An on-chip delay is intentionally
introduced to allow the oscillator to stabilize. t
stab
is equivalent to approximately 512 master clock cycles and depends
on the programmed master oscillator frequency.
Note 7:
Output voltage swings may be impaired at high frequencies combined with high output loading.
Note 8:
A fast-mode device can be used in a standard-mode system, but the requirement t
SU:DAT
> 250ns must then be met. This
is automatically 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 at least t
R MAX
+ t
SU:DAT
= 1000ns +
250ns = 1250ns before the SCL line is released.
Note 9:
After this period, the first clock pulse is generated.
Note 10:
A device must internally provide a hold time of at least 300ns for the SDA signal (referred to as the V
IH MIN
of the SCL sig-
nal) to bridge the undefined region of the falling edge of SCL.
Note 11:
The maximum t
HD:DAT
need only be met if the device does not stretch the LOW period (t
LOW
) of the SCL signal.
Note 12:
C
B
—total capacitance of one bus line, timing referenced to 0.9 x V
CC
and 0.1 x V
CC
.
Typical Operating Characteristics
(V
CC
= 3.3V, T
A
= +25°C, unless otherwise noted.)
ACTIVE SUPPLY CURRENT
vs. TEMPERATURE
DS1087L toc01
TEMPERATURE (
°C)
CURRENT (mA)
80
70
60
50
40
30
20
10
0
-10
-20
-30
5.5
6.0
6.5
7.0
7.5
5.0
-40
90
V
CC
= 3.3V
FREQUENCY = 66.6MHz
OE = PDN = V
CC
15pF LOAD
8.2pF LOAD
4.7pF LOAD
UNLOADED
VOLTAGE (V)
3.5
3.4
2.8 2.9 3.0
3.2
3.1
3.3
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
0
2.7
3.6
ACTIVE SUPPLY CURRENT
vs. VOLTAGE
DS1087L toc02
CURRENT (mA)
FREQUENCY = 66.6MHz
OUTPUT UNLOADED
OE = PDN = V
CC
SUPPLY CURRENT vs. PRESCALER
DS1087L toc03
PRESCALER (DECIMAL)
100
10
1
1000
1
2
3
4
5
6
7
0
CURRENT (mA)
OUTPUT UNLOADED
3.6V
3.3V
2.7V