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参数资料
| 型号： | W156 |
| 英文描述： | Clocks and Buffers |
| 中文描述： | 时钟和缓冲器 |
| 文件页数： | 8/13页 |
| 文件大小： | 167K |
| 代理商： | W156 |
W158
Document #: 38-07164 Rev. *A
Page 8 of 13
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
f
Frequency
Note 36
t
R
Output Rise Edge Rate
Measured from 0.4V to 2.4V
t
F
Output Fall Edge Rate
Measured from 2.4V to 0.4V
t
D
Duty Cycle
Measured on rising and falling edge at 1.5V
f
ST
Frequency Stabilization
from Power-up (cold start)
1 ms from power-up. Short cycles exist prior
to frequency stabilization.
Z
o
AC Output Impedance
Average value during switching transition.
Used for determining series termination
value.
Notes:
32. X1 input threshold voltage (typical) is V
/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
V
TH
C
LOAD
X1 Input threshold Voltage
[32]
Load Capacitance, Imposed on
External Crystal
[33]
X1 Input Capacitance
[34]
Pin Capacitance/Inductance
C
IN
Input Pin Capacitance
C
OUT
Output Pin Capacitance
L
IN
Input Pin Inductance
1.65
18
V
pF
C
IN,X1
Pin X2 unconnected
28
pF
Except X1 and X2
5
6
7
pF
pF
nH
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.
Max.
Unit
Min.
Typ.
66.6
Max.
Unit
MHz
V/ns
V/ns
%
ms
1
1
45
4
4
55
3
Assumes full supply voltage reached within
15
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