W311 Datasheet, PDF(16/19 Page) Silicon Laboratories – FTG for VIA™ Pro-266 DDR Chipset

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W311 Datasheet, PDF (16/19 Pages) Silicon Laboratories – FTG for VIA™ Pro-266 DDR Chipset

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W311

DC Electrical Characteristics: TA = 0Â°C to +70Â°C, 3.3V, VDD = 3.3VÂ±5%, 2.5V, VDD = 2.5VÂ±5% (continued)

Parameter

Description

Test Condition

Min.

Typ.

Max.

Unit

Crystal Oscillator

VTH

X1 Input Threshold Voltage[4]

CLOAD

Load Capacitance, Imposed on

External Crystal[5]

CIN,X1

X1 Input Capacitance[6]

Pin Capacitance/Inductance

VDDQ3 = 3.3V

Pin X2 unconnected

1.65

CIN

COUT

LIN

Input Pin Capacitance

Output Pin Capacitance

Input Pin Inductance

Except X1 and X2

AC Electrical Characteristics

TA = 0Â°C to +70Â°C, 3.3V, VDD= 3.3VÂ±5%, 2.5V, VDD= 2.5VÂ± 5% fXTL = 14.31818 MHz

AC clock parameters are tested and guaranteed over stated operating conditions using the stated lump capacitive load at the

clock output; Spread Spectrum is disabled.

CPU Clock Outputs (Lump Capacitance Test Load = 20 pF)

Parameter Description

Test Condition/

Comments

CPU = 66.6 MHz CPU = 100 MHz CPU = 133 MHz

Min. Typ. Max. Min. Typ. Max. Min. Typ. Max. Unit

Period

Measured on rising edge 15

at 1.25

15.5 10

10.5 7.5

8.0 ns

High Time

Duration of clock cycle

5.2

3.0

1.87

above 2.0V

Low Time

Duration of clock cycle be- 5.0

2.8

1.67

low 0.4V

Output Rise

Measured from 0.4V to

Edge Rate

2.0V

4 V/ns

Output Fall Edge Measured from 2.0V to

Rate

0.4V

4 V/ns

Duty Cycle

Measured on rising and 45

55 45

55 %

falling edge at 1.25V

tJC

Jitter,

Measured on rising edge

250

250 ps

Cycle-to-Cycle at 1.25V. Maximum differ-

ence of cycle time be-

tween two adjacent cycles.

tSK

Output Skew Measured on rising edge

at 1.25V

175

175 ps

fST

Frequency

Assumes full supply volt-

3 ms

Stabilization

age reached within 1 ms

from Power-up from power-up. Short cy-

(cold start)

cles exist prior to frequen-

cy stabilization.

AC Output

Average value during

â¦

Impedance

switching transition. Used

for determining series ter-

mination value.

Notes:

4. X1 input threshold voltage (typical) is 3.3V/2.

5. The W311 contains an internal crystal load capacitor between pin X1 and ground and another between pin X2 and ground. Total load placed on crystal is 18 pF;

this includes typical stray capacitance of short PCB traces to crystal.

6. X1 input capacitance is applicable when driving X1 with an external clock source (X2 is left unconnected).

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