W164
8
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; Spread Spectrum clocking is disabled.
Notes:
5.
X1 input threshold voltage (typical) is VDD/2.
6.
The W164 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.
7.
X1 input capacitance is applicable when driving X1 with an external clock source (X2 is left unconnected).
Crystal Oscillator
VTH
X1 Input Threshold Voltage[5]
VDDQ3 = 3.3V
1.65
V
CLOAD
Load Capacitance, as seen by
External Crystal[6]
13
pF
CIN,X1
X1 Input Capacitance[7]
Pin X2 unconnected
26
pF
Pin Capacitance/Inductance
CIN
Input Pin Capacitance
Except X1 and X2
pF
COUT
Output Pin Capacitance
pF
LIN
Input Pin Inductance
7nH
DC Electrical Characteristics: TA = 0°C to +70°C, VDDQ3 = 3.3V±5%, VDDQ2 = 2.5V±5% (continued)
Parameter
Description
Test Condition
Min.
Typ.
Max.
Unit
CPU Clock Outputs, CPU0:1 (Lump Capacitance Test Load = 20 pF)
Parameter
Description
Test Condition/Comments
CPU = 66.8 MHz
CPU = 100 MHz
Unit
Min.
Typ. Max.
Min.
Typ.
Max.
tP
Period
Measured on rising edge at 1.25V
15
15.5
10
10.5
ns
tH
High Time
Duration of clock cycle above 2.0V
5.2
3.0
ns
tL
Low Time
Duration of clock cycle below 0.4V
5.0
2.8
ns
tR
Output Rise Edge Rate Measured from 0.4V to 2.0V
1
4
1
4
V/ns
tF
Output Fall Edge Rate
Measured from 2.0V to 0.4V
1
4
1
4
V/ns
tD
Duty Cycle
Measured on rising and falling edge at
1.25V
45
55
45
55
%
tJC
Jitter, Cycle-to-Cycle
Measured on rising edge at 1.25V. Max-
imum difference of cycle time between
two adjacent cycles.
200
250
ps
tSK
Output Skew
Measured on rising edge at 1.25V
175
175
ps
fST
Frequency Stabiliza-
tion from Power-up
(cold start)
Assumes full supply voltage reached
within 1 ms from power-up. Short cycles
exist prior to frequency stabilization.
33
ms
Zo
AC Output Impedance
Average value during switching transi-
tion. Used for determining series termi-
nation value.
20
20
Ω
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