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CGS3318
CMOS Crystal Clock Generators
TL/F/10980
CGS3311/CGS3312/CGS3313/CGS3314/CGS3315/CGS3316/
CGS3317/CGS3318/CGS3319
CMOS
Crystal
Clock
Generators
September 1995
CMOS Crystal Clock Generators
CGS3311/CGS3312/CGS3313/CGS3314/CGS3315/
CGS3316/CGS3317/CGS3318/CGS3319
General Description
These devicesare designedfor Clock Generationand Sup-
port (CGSTM) applicationsupto 110 MHz. The CGS331x
seriesof devicesare crystal controlled CMOS oscillators
requiringa minimumof external components. The 331xde-
vices provide selectable output divide ratio (and selectable
crystal drive level).The circuitis designedto operate overa
wide frequency range using fundamental modelor overtone
crystals.
Features National’s CGSTM familyof devicesfor high frequency
clock source applications Crystal frequency operation range:
fundamental:10 MHzto 100 MHz typical
3rdor5th overtone:10 MHzto85 MHz Programmable oscillator drive Selectablefast output edge rates Output symmetry circuitto adjust 50% duty cycle point
between CMOSand TTL levels Output current driveof48mAfor IOL/IOH FACTTM CMOS output levels Outputhas high speed short circuit protection Basic oscillator type: Pierce Hysteresis inputsto improve noise margin
Block Diagrams
TL/F/10980–1
Note: Pinnumbersvaryforeach device
TRI-STATEÉ isaregistered trademarkof National SemiconductorCorporation.
CGSTM andFACTTMare trademarks ofNationalSemiconductorCorporation.
C1995National SemiconductorCorporation RRD-B30M115/PrintedinU.S.A.
