SPC56ECxx datasheet(83/123 Pages) STMICROELECTRONICS

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SPC564Bxx-SPC56ECxx

Electrical Characteristics

122

3.14

FMPLL electrical characteristics

The device provides a frequency-modulated phase-locked loop (FMPLL) module to

generate a fast system clock from the main oscillator driver.

3.15

Fast internal RC oscillator (16 MHz) electrical characteristics

The device provides a 16 MHz main internal RC oscillator. This is used as the default clock

at the power-up of the device and can also be used as input to PLL.

Table 39. FMPLL electrical characteristics

Symbol

Parameter

Conditions(1)

Value(2)

Unit

Min

Typ

Max

fPLLIN

— FMPLL reference clock(3)

—4

—

MHz



PLLIN

—

FMPLL reference clock

duty cycle(3)

—40

—

fPLLOUT

FMPLL output clock

frequency

—

120

MHz

fCPU

— System clock frequency

—

120 + 2%(4)

MHz

fFREE

P Free-running frequency

—

150

MHz

tLOCK

P FMPLL lock time

Stable oscillator (fPLLIN = 16 MHz)

100

µs

t

LTJIT

— FMPLL long term jitter

fPLLIN = 40 MHz (resonator),

fPLLCLK @ 120 MHz, 4000 cycles

——

(for < 1ppm)

IPLL

C FMPLL consumption

TA = 25 °C

—

VDD = 3.3 V ± 10% / 5.0 V ± 10%, TA = 40 to 125 °C, unless otherwise specified.

All values need to be confirmed during device validation.

PLLIN clock retrieved directly from 4-40 MHz XOSC or 16 MIRC. Input characteristics are granted when oscillator is used

in functional mode. When bypass mode is used, oscillator input clock should verify fPLLIN and PLLIN.

fCPU 120 + 2% MHz can be achieved at 125 °C.

Table 40. Fast internal RC oscillator (16 MHz) electrical characteristics

Symbol

Parameter

Conditions(1)

Value(2)

Unit

Min

Typ

Max

fFIRC

Fast internal RC oscillator high

frequency

TA = 25 °C, trimmed

—

MHz

——

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