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 controlled 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 crystals.

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 IOL/IOH

■ 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