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W149
Document #: 38-07176 Rev. *A
Page 10 of 16
Crystal Oscillator
VTH
X1 Input threshold Voltage[7]
VDDQ3 = 3.3V
1.65
V
CLOAD
Load Capacitance, Imposed on
External Crystal[8]
14
pF
CIN,X1
X1 Input Capacitance[9]
Pin X2 unconnected
28
pF
Pin Capacitance/Inductance
CIN
Input Pin Capacitance
Except X1 and X2
5
pF
COUT
Output Pin Capacitance
6pF
LIN
Input Pin Inductance
7nH
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).
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
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