SM802117 Ver la hoja de datos (PDF) - Micrel
Número de pieza
componentes Descripción
Fabricante
SM802117 Datasheet PDF : 10 Pages
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Micrel, Inc.
Pin Description (Continued)
Pin Number
5, 6 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)
7
OE1
I, (SE)
12
OE2
I, (SE)
SM802117
Pin Level
LVCMOS
crystal
crystal
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.
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
and do not place switching signals or noisy supplies
under the crystal.
Crystal load capacitance is built inside the die so no
external capacitance is needed. See the Selecting a
Quartz crystal for the Clockworks Flex I Family of
Precision Synthesizers application note for further
details.
Contact Micrel’s HBW applications group if you need
assistance on selecting a suitable crystal for your
application at hbwhelp@micrel.com.
HU
UH
Truth Table
PLL_BYPASS
0
1
XTAL_SEL
−
−
−
0
−
1
INPUT
−
−
REF_IN
XTAL
OUTPUT
PLL
XTAL/REF_IN
−
−
October 2011
3
M9999-101311-B
hbwhelp@micrel.com or (408) 955-1690
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