W149H 查看數據表（PDF） - Cypress Semiconductor

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W149H

440BX AGPset Spread Spectrum Frequency Synthesizer

Cypress Semiconductor 

W149

DC Electrical Characteristics: (continued) TA = 0°C to +70°C; VDDQ3 = 3.3V±5%; VDDQ2 = 2.5V±5%

Parameter

Description

Test Condition

Min.

Typ.

Max. Unit

Crystal Oscillator

VTH

X1 Input threshold Voltage[7]

CLOAD

Load Capacitance, Imposed on

External Crystal[8]

CIN,X1

X1 Input Capacitance[9]

Pin Capacitance/Inductance

VDDQ3 = 3.3V

Pin X2 unconnected

1.65

V

14

pF

28

pF

CIN

Input Pin Capacitance

Except X1 and X2

5

pF

COUT

Output Pin Capacitance

6

pF

LIN

Input Pin Inductance

7

nH

Notes:

7. X1 input threshold voltage (typical) is VDDQ3/2.

8. The W149 contains an internal crystal load capacitor between pin X1 and ground and another between pin X2 and ground. Total load placed on crystal is

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

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

Document #: 38-07176 Rev. *A

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