DS1080L Datasheet, PDF (7/8 Pages) Dallas Semiconductor – Spread-Spectrum Crystal Multiplier

Spread-Spectrum Crystal Multiplier
Typical Operating Circuit
C_L1
X1
1
GND
2
CMSEL
3
SMSEL
4
CRYSTAL
DS1080L
C_L2
X2
8
7 ^VCC
SSO
6
PDN
5
V_CC
DECOUPLING
CAPACITOR
f_SSO
V_CC
NOTE: IN THE ABOVE CONFIGURATION WITH PDN CONNECTED TO V_CC, SMSEL CONNECTED TO GND
AND CMSEL FLOATING, THE DEVICE IS IN NORMAL OPERATION WITH 2x CLOCK MULTIPLICATION, AND
SPREAD-SPECTRUM MAGNITUDE OF ±0.5%.
Layout Considerations
As noted earlier, the crystal should be placed very
close to the device to minimize excessive loading due
to parasitic capacitances. Care should also be taken to
minimize loading on pins that could be floated as a pro-
gramming option (SMSEL and CMSEL). Coupling on
inputs due to clocks should be minimized.
Chip Information
TRANSISTOR COUNT: 3951
SUBSTRATE CONNECTED TO GROUND
Package Information
For the latest package outline information and land patterns,
go to www.maxim-ic.com/packages. Note that a “+”, “#”, or
“-” in the package code indicates RoHS status only. Package
drawings may show a different suffix character, but the drawing
pertains to the package regardless of RoHS status.
PACKAGE TYPE PACKAGE CODE DOCUMENT NO.
8 μSOP
U8+1
21-0036
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