ST72F262G2B6 datasheet(139/172 Pages) STMICROELECTRONICS

Part #	ST72F262G2B6

Description	8-BIT MCU WITH FLASH OR ROM MEMORY, ADC, TWO 16-BIT TIMERS, I2C, SPI, SCI INTERFACES

PDF	172 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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139 / 172 page

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CLOCK CHARACTERISTICS (Cont’d)

13.5.5 PLL Characteristics

Note:

1. Data characterized but not tested.

Figure 74. PLL Jitter vs. Signal frequency1

The user must take the PLL jitter into account in

the application (for example in serial communica-

tion or sampling of high frequency signals). The

PLL jitter is a periodic effect, which is integrated

over several CPU cycles. Therefore the longer the

period of the application signal, the less it will be

impacted by the PLL jitter.

Figure 74 shows the PLL jitter integrated on appli-

cation signals in the range 125kHz to 2MHz. At fre-

quencies of less than 125KHz, the jitter is negligi-

ble.

Note 1: Measurement conditions: fCPU = 4MHz, TA= 25°C

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

VDD(PLL)

PLL Operating Range

TA 0 to 70°C

3.5

5.5

TA -40 to +85°C

4.5

5.5

fOSC

PLL input frequency range

MHz

∆ f

CPU/fCPU

Instantaneous PLL jitter 1)

fOSC = 4 MHz.

1.0

2.5

fOSC = 2 MHz.

2.5

4.0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

2000

1000

500

250

125

Application Signal Frequency (KHz)

PLL ON

PLL OFF

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