SM802105 Datasheet, PDF (3/11 Pages) Micrel Semiconductor – ClockWork 10GbE (156.25MHz, 312.5MHz), Ultra-Low Jitter, LVPECL Frequency Synthesizer

Micrel, Inc.
Pin Description (Continued)
Pin Number
5, 11, 16, 18
1
13, 14, 15
17
21
8
Pin Name
TEST
VDD
VSS
VDDO1
VSSO1
REF_IN
Pin Type
PWR
PWR
PWR
PWR
I, (SE)
9
XTAL_IN
I, (SE)
10
XTAL_OUT
O, (SE)
6
FSEL
I, (SE)
7
OE1
I, (SE)
12
OE2
I, (SE)
SM802105
Pin Level
LVCMOS
12pF crystal
12pF crystal
LVCMOS
LVCMOS
LVCMOS
Pin Function
Factory Test pins, Do not connect anything to these pins.
Core Power Supply
Core Power Supply Ground
Power Supply for Output Bank 1
Power Supply Ground for Output Bank 1
Reference Clock Input
Crystal Reference Input, no load caps needed.
See Fig. 5.
Crystal Reference Output, no load caps needed.
See Fig. 5.
Frequency Select, 1 = 156.25MHz, 0 = 312.5MHz,
45KΩ pull-up
Output Enable, Q1 disables to tri-state,
0 = Disabled, 1 = Enabled, 45KΩ pull-up
Output Enable, Q2 disables to tri-state,
0 = Disabled, 1 = Enabled, 45KΩ pull-up
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 Tables
PLL_BYPASS
0
1
−
−
XTAL_SEL
−
−
0
1
INPUT
−
−
REF_IN
XTAL
OUTPUT
PLL
XTAL/REF_IN
−
−
FSEL
0
1
Output Frequency
(MHz)
312.5
156.25
April 2011
3
M9999-042111-A
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