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參數(shù)資料
| 型號： | P1811B-08ST |
| 元件分類： | XO, clock |
| 英文描述： | 20 MHz, OTHER CLOCK GENERATOR, PDSO8 |
| 封裝： | SOIC-8 |
| 文件頁數(shù)： | 2/6頁 |
| 文件大?。?/td> | 121K |
| 代理商： | P1811B-08ST |
Alliance Semiconductor
a
PRELIMINARY Specification
P1811A/B
May, 2002
Revision C
PulseCore – A Division of Alliance Semiconductor
3160 De La Cruz Blvd., Suite 200 Santa Clara CA 95054
Tel (408) 748-6988 Fax (408) 748-0009
2 of 2
http://www.pulsecore.com
Figure 2 - P1811 Block Diagram
P1811 Block Diagram
Output
Divider
XIN
VSS
ModOUT
XOUT
Crystal
Oscillator
Modulation
Phase
Detector
Frequency
Divider
Feedback
Divider
Loop
Filter
VCO
PLL
SR0 SR1 SSON
VDD
Table 1 - Standby Mode Selection
SSON/SBM
Spread
Spectrum
0
N/A
1
N/A
0
OFF
1
ON
CLKIN
ModOut
PLL
Mode
Disabled
Disabled
Enabled
Enabled
Disabled
Disabled
Reference
Normal
Disabled
Free Running
Disabled
Normal
Standby
Free Running
Buffer Out
Normal
Table 2 - Spread Range Selection
SR1
Spreading Range
0
+/- 1.50%
1
+/- 2.50%
0
+/- 1.25%
1
+/- 2.00%
SR0
0
0
1
1
Modulation rate
(Fin/10)*20.83 KHz
(Fin/10)*20.83 KHz
(Fin/10)*20.83 KHz
(Fin/10)*20.83 KHz
PIN DESCRIPTION
PIN #
1
Name
CLKIN
Type Description
I
Connect to externally generated clock signal. To put the part into standby
mode, disable the input clock signal to this pin and pull SSON/SBM (Pin
4) low (see Table 1).
P
Ground Connection. Connect to system ground.
I
Digital logic input used to select Spreading Range (see Table 2). This pin
has an internal pull-up resistor.
I
Spread Spectrum On / Off and Standby Mode control (see Table 1). This
pin has an internal pull-up resistor.
O
Spread Spectrum clock output or Reference output (see Table 1).
I
Digital logic input used to select Spreading Range (see Table 2). This pin
has an internal pull-up resistor.
P
Connect to +3.3V
I
Connect to crystal. No connect if externally generated clock signal is
used.
2
3
VSS
SR0
4
SSON/SB
M
ModOUT
SR1
5
6
7
8
VDD
XOUT
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