© 2001 Fairchild Semiconductor Corporation DS011503 www.fairchildsemi.com
September 1195
Revised January 2001
CGS3321 • CGS3322 CMOS Crystal Clock Generators
CGS3321 • CGS3322
CMOS Crystal Clock Generators
General Description
The CGS3321 and CGS3322 devices are designed for
Clock Generation and Support (CGS) applications up to
110 MHz. The CGS332x series of devices are crystal con-
trolled CMOS oscillators requiring a minimum of external
components. The 332x devices provide selectable output
divide ratio. The circuit is designed to operate over a wide
frequency range using fundamental mode or overtone crys-
tals.
Features
■ Fairchild’s CGS family of devices for high frequency
clock source applications
■ Crystal frequency operation range:
fundamental: 10 MHz to 100 MHz typical
3rd or 5th overtone: 10 MHz to 95 MHz
■ 1000V ESD protection on OCS_IN and OSC_OUT pins.
2000V ESD protection on all other pins
■ Output current drive of 48 mA for I
OL
/I
OH
■ FACT CMOS output levels
■ Output has high speed short circuit protection
■ Intended for Pierce oscillator applications
■ Hysteresis inputs to improve noise margin
■ CGS3321 has duty cycle adjust
■ CGS3322 has 1, 2, 4 divide ratio
Ordering Code:
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
Connection Diagrams
CGS3321
CGS3322
Truth Table
Division Selection
Note: Actual value of the floating DIVB input is V
CC/2
FACT is a trademark of Fairchild Semiconductor Corporation.
Order Number Package Number Package Description
CGS3321M M08A 8-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150" Narrow
CGS3322M M08A 8-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150" Narrow
DIVB OEH Divider Output
F X Divide-by 1
1 1 Divide-by 2
0 1 Divide-by 4
