W164
| Model | W164 |
| Description | Spread Spectrum Desktop/Notebook System Frequency Generator |
| PDF file | Total 11 pages (File size: 140K) |
| Chip Manufacturer | CYPRESS |
W164
DC Electrical Characteristics:
T
A
= 0°C to +70°C, V
DDQ3
= 3.3V±5%, V
DDQ2
= 2.5V±5% (continued)
Parameter
Crystal Oscillator
V
TH
C
LOAD
C
IN,X1
C
IN
C
OUT
L
IN
X1 Input Threshold Voltage
[5]
Load Capacitance, as seen by
External Crystal
[6]
X1 Input Capacitance
[7]
Input Pin Capacitance
Output Pin Capacitance
Input Pin Inductance
7
Pin X2 unconnected
Except X1 and X2
V
DDQ3
= 3.3V
1.65
13
26
V
pF
pF
pF
pF
nH
Description
Test Condition
Min.
Typ.
Max.
Unit
Pin Capacitance/Inductance
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
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.
CPU Clock Outputs, CPU0:1 (Lump Capacitance Test Load = 20 pF)
CPU = 66.8 MHz
Parameter
t
P
t
H
t
L
t
R
t
F
t
D
t
JC
Description
Period
High Time
Low Time
Output Fall Edge Rate
Duty Cycle
Jitter, Cycle-to-Cycle
Test Condition/Comments
Measured on rising edge at 1.25V
Duration of clock cycle above 2.0V
Duration of clock cycle below 0.4V
Measured from 2.0V to 0.4V
Measured on rising and falling edge at
1.25V
Measured on rising edge at 1.25V. Max-
imum difference of cycle time between
two adjacent cycles.
Measured on rising edge at 1.25V
Assumes full supply voltage reached
within 1 ms from power-up. Short cycles
exist prior to frequency stabilization.
Average value during switching transi-
tion. Used for determining series termi-
nation value.
20
15
5.2
5.0
1
1
45
4
4
55
200
15.5
CPU = 100 MHz
Typ. Max. Unit
10.5
ns
ns
ns
4
4
55
250
V/ns
V/ns
%
ps
10
3.0
2.8
1
1
45
Min. Typ. Max. Min.
Output Rise Edge Rate Measured from 0.4V to 2.0V
t
SK
f
ST
Output Skew
Frequency Stabiliza-
tion from Power-up
(cold start)
AC Output Impedance
175
3
175
3
ps
ms
Z
o
20
Ω
Notes:
5. X1 input threshold voltage (typical) is V
DD
/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).
8
