VDP3108B datasheet(55/72 Pages) MICRONAS

55 / 72 page

PRELIMINARY DATA SHEET

VDP 31xxB

Micronas

Recommended Crystal Characteristics, continued

Symbol

Parameter

Min.

Typ.

Max.

Unit

Load Capacitance Recommendation

CLext

External Load Capacitance 1)

from pins to Ground

(pin names: Xtal1 Xtal2)

–

3.3

–

DCO Characteristics 2)

CICLoadmin

Effective Load Capacitance @ min.

DCO-Position, Code 0,

3.6

4.3

CICLoadrng

Effective Load Capacitance Range,

DCO Codes from 0..255

11.7

12.7

13.7

1) Remarks on defining the External Load Capacitance:

External capacitors at each crystal pin to ground are required. They are necessary to tune the effective load capacitance of

the PCBs to the required load capacitance CL of the crystal. The higher the capacitors, the lower the clock frequency re-

sults. The nominal free running frequency should match fp MHz. Due to different layouts of customer PCBs the matching

capacitor size should be determined in the application. The suggested value is a figure based on experience with various

PCB layouts.

Tuning condition: Code DVCO Register = –720

Tuning condition: Code DVCO Register

720

2) Remarks on Pulling Range of DCO:

The pulling range of the DCO is a function of the used crystal and effective load capacitance of the IC (CICLoad +CLoadBoard).

The resulting frequency fL with an effective load capacitance of CLeff = CICLoad + CLoadBoard is

1 + 0.5 * [ C1 / (C0 + CLeff ) ]

fL = fP * –––––––––––––––––––––––

1 + 0.5 * [ C1 / (C0 + CL ) ]

4.6.4. Characteristics

at TA = 0 to 65 °C, VSUPD/F/O = 4.75 to 5.25 V, f = 20.25 MHz for min./max. values

at TC = 60 °C, VSUPD/F/O = 5 V, f = 20.25 MHz for typical values

Symbol

Parameter

Pin Name

Min.

Typ.

Max.

Unit

IVSUPF

Current Consumption

VSUPF

–

IVSUPD

Current Consumption

VSUPD

–

123

–

IVSUPO

Current Consumption

VSUPO

–

IVSTDBY

Current Consumption

VSTDBY

–

3.3

–

PTOT

Total Power Dissipation

–

1145

1200

Input / Output Leakage Current

All I/O Pins

–1

–

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