SM802108 Datasheet, PDF (3/11 Pages) Micrel Semiconductor – ClockWorks™ 10GbE & GbE (156.25MHz, 125MHz) Ultra-Low Jitter, LVPECL Frequency Synthesizer

Micrel, Inc.
Pin Description (Continued)
Pin Number
7, 12, 15, 19
8
9
Pin Name
TEST
VDD
REF_IN
Pin Type
PWR
I, (SE)
10
XIN
I, (SE)
11
13, 14
18
22
XOUT
VSS
VDDO1
VSSO1
O, (SE)
PWR
PWR
PWR
SM802108
Pin Level
LVCMOS
12pF crystal
12pF crystal
Pin Function
Factory Test Pins, Do not connect anything to these pins.
Core Power Supply
Reference Clock Input
Crystal Reference Input, no load caps needed.
See Fig. 5.
Crystal Reference Output, no load caps needed.
See Fig. 5.
Core Power Supply Ground
Power Supply for Output Bank 1
Power Supply Ground for Output Bank 1
Application Information
Input Reference
When operating with a crystal input reference, do not
apply a switching signal to REF_IN.
Crystal Layout
Keep the layers under the crystal as open as possible.
Do not place switching signals or noisy supplies under
the crystal.
Truth Table
PLL_BYPASS
0
1
−
−
XTAL_SEL
−
−
0
1
INPUT
−
−
REF_IN
XTAL
OUTPUT
PLL
XTAL/REF_IN
−
−
January 2011
3
M9999-012111-A
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