ST6208LD3SLASHOTP datasheet(73/104 Pages) STMICROELECTRONICS

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CLOCK AND TIMING CHARACTERISTICS (Cont’d)

10.5.3 Crystal and Ceramic Resonator Oscillators

The ST6 internal clock can be supplied with sever-

al different Crystal/Ceramic resonator oscillators.

Only parallel resonant crystals can be used. All the

information given in this paragraph are based on

characterization results with specified typical ex-

ternal components. Refer to the crystal/ceramic

resonator manufacturer for more details (frequen-

cy, package, accuracy...).

Notes:

1. Resonator characteristics given by the crystal/ceramic resonator manufacturer.

2. tSU(OSC) is the typical oscillator start-up time measured between VDD=2.8V and the fetch of the first instruction (with a

quick VDD ramp-up from 0 to 5V (<50µs).

3. The oscillator selection can be optimized in terms of supply current using an high quality resonator with small RS value.

Refer to crystal/ceramic resonator manufacturer for more details.

Figure 50. Typical Application with a Crystal or Ceramic Resonator

Symbol

Parameter

Conditions

Typ

Unit

Feedback resistor

Ω

CL1

CL2

Recommended load capacitances versus equiva-

lent crystal or ceramic resonator frequency

fOSC=32 kHz,

fOSC=1 MHz

fOSC=2 MHz

fOSC=4 MHz

fOSC=8 MHz

120

Oscillator

Typical Crystal or Ceramic Resonators

CL1

[pF]

CL2

[pF]

tSU(osc)

[ms] 1)

Reference

Freq.

Characteristic 1)

CSB455E

455KHz

∆f

OSC=[±0.5KHztolerance,±0.3%

∆Ta,±0.5%aging]

220 220

CSB1000J

1MHz

∆f

OSC=[±0.5KHztolerance,±0.3%

∆Ta,±0.5%aging]

100 100

CSTCC2.00MG0H6

2MHz

∆f

OSC=[±0.5%tolerance,±0.5%

∆Ta,±0.3%aging]47

CSTCC4.00MG0H6

4MHz

∆f

OSC=[±0.5%tolerance,±0.3%

∆Ta,±0.3%aging]47

CSTCC8.00MG

8MHz

∆f

OSC=[±0.5%tolerance,±0.3%

∆Ta,±0.3%aging]15

OSCOUT

OSCIN

CL1

CL2

ST62XX

RESONATOR

VDD

FOSC

ST6208LD3/OTP 数据表(PDF) 73 Page - STMicroelectronics

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