W158_02 Datasheet, PDF (8/13 Pages) Cypress Semiconductor – Spread Spectrum System Frequency Synthesizer

W158
DC Electrical Characteristics: T_A = 0°C to +70°C, V_DDQ3 = 3.3V±5%, V_DDQ2 = 2.5V±5%
Parameter
Description
Test Condition
Min.
Typ.
Crystal Oscillator
V_TH
X1 Input threshold Voltage^[32]
C_LOAD
Load Capacitance, Imposed on
External Crystal^[33]
C_IN,X1
X1 Input Capacitance^[34]
Pin Capacitance/Inductance
Pin X2 unconnected
1.65
18
28
C_IN
C_OUT
L_IN
Input Pin Capacitance
Output Pin Capacitance
Input Pin Inductance
Except X1 and X2
Max.
Unit
V
pF
pF
5
pF
6
pF
7
nH
3.3V AC Electrical Characteristics
T_A = 0°C to +70°C, V_DDQ3 = 3.3V±5%, V_DDQ2 = 2.5V± 5%, f_XTL = 14.31818 MHz
Spread Spectrum function turned off
AC clock parameters are tested and guaranteed over stated operating conditions using the stated lump capacitive load at the
clock output.^[35]
3V66 Clock Outputs, 3V66_0:3 (Lump Capacitance Test Load = 30 pF)
Parameter
Description
Test Condition/Comments
Min. Typ. Max. Unit
f
Frequency
Note 36
66.6
MHz
t_R
Output Rise Edge Rate Measured from 0.4V to 2.4V
1
t_F
Output Fall Edge Rate
Measured from 2.4V to 0.4V
1
t_D
Duty Cycle
Measured on rising and falling edge at 1.5V 45
f_ST
Frequency Stabilization Assumes full supply voltage reached within
from Power-up (cold start) 1 ms from power-up. Short cycles exist prior
to frequency stabilization.
4
V/ns
4
V/ns
55
%
3
ms
Z_o
AC Output Impedance
Average value during switching transition.
15
Ω
Used for determining series termination
value.
Notes:
32. X1 input threshold voltage (typical) is V_DD/2.
33. The W158 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.
34. X1 input capacitance is applicable when driving X1 with an external clock source (X2 is left unconnected).
35. Period, jitter, offset, and skew measured on rising edge at 1.5V.
36. 3V66 is CPU/2 for CPU =133 MHz and (2 x CPU)/3 for CPU = 100 MHz.
Document #: 38-07164 Rev. *A
Page 8 of 13