STR720 datasheet(383/401 Pages) STMICROELECTRONICS

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STR720 - ELECTRICAL CHARACTERISTICS

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VDD(all) = 1.80 V ± 10%, VDD3(all) = 3.30 V ± 10%, TA = -40 / +85 °C unless otherwise specified.

Data based on design guidelines and validation, not tested in production.

Data based on design characterization performed on sample devices, not tested in production.

28.7.4

32 kHz Real-Time Clock Oscillator

The RTC block can be driven by a crystal oscillator. In the application, the crystal and the load

capacitors have to be placed as close as possible to the oscillator pins in order to minimize

output distortion and start-up stabilization time. Refer to the crystal manufacturer for more

details (frequency, package, accuracy, etc.). A recommended configuration is shown on

Figure 76 and detailed on Table 97 whose values have been checked using standard crystals.

Table 96. PLL Characteristics

Symbol

Parameter

Test Conditions(1)

Value

Unit

Min

Typ

Max

VDDPLL

Supply Voltage for PLL

1.6

1.80

2.0

fREF

PLL Reference clock frequency

(2)

MHz

fVCO

PLL VCO clock frequency(2)

1080

MHz

tLOCK

PLL lock-in time

116

±200

µs

TJITTER

Peak-to-peak PLL jitter val-

ue(3)

(TMAX-TMIN) / TOUT

VREF = 1.64 V

∆V

CLK = 400 mV

fCLK = 49.1 MHz

DIV2 enabled,M=11, D=4.

-2.9

3.5

JITTER

Standard deviation PLL jitter

value(3)

σ(T) / T

OUT

same as above.

-0.5

0.7

IDDPLL_R

VDDPLL RUN mode current

Same as above

1.3

1.4

IDDPLL_O

VDDPLL off current

Figure 76. Crystal Oscillator typical application

STR720

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