ST72324BL datasheet(119/151 Pages) STMICROELECTRONICS

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ST72F324L, ST72324BL

119/151

CLOCK CHARACTERISTICS (Cont’d)

12.5.5 PLL Characteristics

Note:

1. Instantaneous PLL jitter is the absolute maximum deviation on a single clock period. Data characterized, not tested in

production.

Figure 63. PLL Clock Jitter vs. Application

Signal frequency1

PLL clock jitter may cause application errors if high

frequency signals are input or output by the appli-

cation (e.g. high speed serial I/O or sampling of

high frequency signals).

Using the PLL increases clock jitter, however this

is a periodic effect which is absorbed over several

CPU cycles. The lower the frequency of the appli-

cation signal, the less the impact.

Figure 63 shows the effect of jitter (with and with-

out PLL) on application signals in the range

125kHz to 2MHz. At frequencies of less than

125kHz, the jitter is negligible.

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

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

VDD(PLL)

PLL Operating Range

2.85

3.6

fOSC

PLL input frequency range

MHz

∆ f

CPU/fCPU

Instantaneous PLL jitter 1)

fOSC = 4 MHz. (fCPU=8MHz.)

3.5

5.5

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)

FLASH

DEVICES

ROM

DEVICES

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