ST72344 datasheet(156/191 Pages) STMICROELECTRONICS

156 / 191 page

ST72340, ST72344, ST72345

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13.4 PLL CHARACTERISTICS

Note:

1. To obtain a x4 multiplication ratio in the range 3.3 to 5.5V, the DIV2EN option bit must enabled.

2. Guaranteed by design.

13.4.1 Internal RC Oscillator and PLL

The ST7 internal clock can be supplied by an internal RC oscillator and PLL (selectable by option byte).

13.5 INTERNAL RC OSCILLATOR CHARACTERISTICS

Notes:

1. If the RC oscillator clock is selected, to improve clock stability and frequency accuracy, it is recommended to place a

decoupling capacitor, typically 100nF, between the VDD and VSS pins as close as possible to the ST7 device.

2. See “Internal RC Oscillator” on page 30

3. Expected results. Data based on characterization, not tested in production

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

fPLLIN

PLL Input frequency 2)

VDD = 2.7 to 3.65V

PLL option x4 selected

0.95

1.05

MHz

VDD = 3.3 to 5.5V

PLL option x8 selected

0.90

1.10

VDD(PLL)

PLL operating range

PLL option x4 selected 1)

2.7

3.65

PLL option x8 selected

3.3

5.5

tw(JIT)

PLL jitter period

fRC = 1MHz

kHz

JITPLL

PLL jitter (

∆f

CPU/fCPU)

VDD = 3.0V

3.0

VDD = 5.0V

1.6

IDD(PLL)

PLL current consumption

TA=25°C

600

µA

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

VDD(RC)

Internal RC Oscillator operating voltage

Refer to operating range

of VDD with TA, Section

13.3.1 on page 154

2.7

5.5

VDD(x4PLL) x4 PLL operating voltage

2.7

5.5

VDD(x8PLL)

x8 PLL operating voltage

3.3

5.5

tSTARTUP

PLL Startup time

PLL

input

clock

(fPLL)

cycles

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

fRC

Internal RC oscillator fre-

quency 1)

RCCR = FF (reset value), TA=25°C,VDD=5V

625

kHz

RCCR = RCCR02 ),TA=25°C,VDD=5V

1000

ACCRC

Accuracy of Internal RC

oscillator with

RCCR=RCCR02)

TA=25°C,VDD=5V

-1

TA=25°C, VDD=4.5 to 5.5V

-1

TA=25 to +85°C,VDD=5V

-3

TA=25 to +85°C,VDD=4.5 to 5.5V

-3.5

+3.5

TA=-40 to +25°C,VDD=4.5 to 5.5V

-3

IDD(RC)

RC oscillator current con-

sumption

TA=25°C,VDD=5V

6003)

µA

tsu(RC)

RC oscillator setup time

TA=25°C,VDD=5V

102)

µs

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