DS1087L
3.3V Spread-Spectrum EconOscillator
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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
.
Note 13: Typical frequency shift due to aging is ±0.5%. Aging stressing includes Level 1 moisture reflow preconditioning (24hr
+125°C bake, 168hr 85°C/85%RH moisture soak, and 3 solder reflow passes +240 +0/-5°C peak) followed by 1000hr
max V
CC
biased 125°C HTOL, 1000 temperature cycles at -55°C to +125°C, and 168hr 121°C/2 ATM Steam/Unbiased
Autoclave.
Typical Operating Characteristics
(V
CC
= 3.3V, T
A
= +25°C, unless otherwise noted.)
