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W158 Datasheet(PDF) 8 Page - SpectraLinear Inc |
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W158 Datasheet(HTML) 8 Page - SpectraLinear Inc |
8 / 12 page W158 Rev 1.0, November 21, 2006 Page 8 of 12 3.3V AC Electrical Characteristics TA = 0°C to +70°C, VDDQ3 = 3.3V±5%, VDDQ2 = 2.5V± 5%, fXTL = 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] Notes: 32. X1 input threshold voltage (typical) is VDD/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. Crystal Oscillator VTH X1 Input threshold Voltage[32] 1.65 V CLOAD Load Capacitance, Imposed on External Crystal[33] 18 pF CIN,X1 X1 Input Capacitance[34] Pin X2 unconnected 28 pF Pin Capacitance/Inductance CIN Input Pin Capacitance Except X1 and X2 5 pF COUT Output Pin Capacitance 6 pF LIN Input Pin Inductance 7nH DC Electrical Characteristics: TA = 0°C to +70°C, VDDQ3 = 3.3V±5%, VDDQ2 = 2.5V±5% Parameter Description Test Condition Min. Typ. Max. Unit 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 tR Output Rise Edge Rate Measured from 0.4V to 2.4V 1 4 V/ns tF Output Fall Edge Rate Measured from 2.4V to 0.4V 1 4 V/ns tD Duty Cycle Measured on rising and falling edge at 1.5V 45 55 % fST Frequency Stabilization from Power-up (cold start) Assumes full supply voltage reached within 1 ms from power-up. Short cycles exist prior to frequency stabilization. 3ms Zo AC Output Impedance Average value during switching transition. Used for determining series termination value. 15 |
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