CD00001237 datasheet(74/105 Pages) STMICROELECTRONICS

74 / 105 page

ST6215C ST6225C

74/105

CLOCK AND TIMING CHARACTERISTICS (Cont’d)

11.5.3 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

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

Δf

OSC=[±0.5KHztolerance,±0.3%

ΔTa,±0.5%aging]

220 220

CSB1000J

1MHz

Δf

OSC=[±0.5KHztolerance,±0.3%

ΔTa,±0.5%aging]

100 100

CSTCC2.00MG0H6

2MHz

Δf

OSC=[±0.5%tolerance,±0.5%

ΔTa,±0.3%aging]47

CSTCC4.00MG0H6

4MHz

Δf

OSC=[±0.5%tolerance,±0.3%

ΔTa,±0.3%aging]47

CSTCC8.00MG

8MHz

Δf

OSC=[±0.5%tolerance,±0.3%

ΔTa,±0.3%aging]15

OSCOUT

OSCIN

CL1

CL2

ST62XX

RESONATOR

VDD

FOSC

CD00001237 数据表(PDF) 74 Page - STMicroelectronics

CD00001237 数据表(HTML) 74 Page - STMicroelectronics

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

数据表下载