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W137 Datasheet, PDF (6/8 Pages) Cypress Semiconductor – Bx Notebook System Frequency Synthesizer
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W137
DC Electrical Characteristics: (continued)
TA = 0°C to +70°C; VDDQ3 = 3.3V±5%; VDDQ2 = 2.5V±5%; CPU0:1 = 66.6/100 MHz
Parameter
Description
Pin Capacitance/Inductance
CIN
Input Pin Capacitance
COUT
Output Pin Capacitance
LIN
Input Pin Inductance
Test Condition
Except X1 and X2
Min.
Typ.
Max. Unit
5
pF
6
pF
7
nH
AC Electrical Characteristics
TA = 0°C to +70°C; VDDQ3 = 3.3V±5%; VDDQ2 = 2.5V±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.
CPU Clock Outputs, CPU0:1 (Lump Capacitance Test Load = 20 pF)
CPU = 66.6 MHz
Parameter
Description
Test Condition/Comments
Min. Typ. Max.
tP
Period
Measured on rising edge at 1.25V
15
15.5
tH
High Time
tL
Low Time
Duration of clock cycle above 2.0V
5.2
Duration of clock cycle below 0.4V
5.0
tR
Output Rise Edge Rate Measured from 0.4V to 2.0V
1
4
tF
Output Fall Edge Rate Measured from 2.0V to 0.4V
1
4
tD
Duty Cycle
Measured on rising and falling edge at 45
55
1.25V
tJC
Jitter, Cycle-to-Cycle Measured on rising edge at 1.25V.
200
Maximum difference of cycle time
between two adjacent cycles.
tSK
Output Skew
Measured on rising edge at 1.25V
175
fST
Frequency Stabili- Assumes full supply voltage reached
3
zation from Power-up within 1 ms from power-up. Short cycles
(cold start)
exist prior to frequency stabilization.
Zo
AC Output Impedance Average value during switching
13.5
transition. Used for determining series
termination value.
CPU = 100 MHz
Min. Typ. Max. Unit
10
10.5 ns
3.0
ns
2.8
ns
1
4 V/ns
1
4 V/ns
45
55 %
200 ps
175 ps
3 ms
13.5
:
Notes:
4. The W137 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.
5. X1 input capacitance is applicable when driving X1 with an external clock source (X2 is left unconnected).
Rev 1.0, November 24, 2006
Page 6 of 8
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