2001-08-06

Page

1

MDST-0012-02

www.vaishali.com

Vaishali Semiconductor

747 Camden Avenue, Suite C

Campbell

CA 95008

Ph. 408.377.6060

Fax 408.377.6063

Applications

•= Crystal-driven clock source

General Description

The Vaishali VT73127 is a single-chip, low-jitter Voltage-Controlled-Crystal-Oscillator. The device accepts

a 27 MHz, 20 pF crystal input, and produces a low jitter output at the same frequency. The output is

enabled when OE is logic HIGH and goes into high impedance state when OE is logic LOW. A 0 to 3.0V

control signal is used to fine tune the output clock frequency in the ±100ppm range.

Features

•= 3.3V operating voltage

•= Uses inexpensive pullable crystals

•= 12mA drive capability at TTL levels

•= On-chip oscillator with 200 ppm pull range (±100 ppm)

•= Active High output enable

•= Die only

Preliminary

VT73127

27 MHz 3.3V VCXO with Output Enable

Figure 1. Functional Block Diagram

CLK

OE

VDD2

X2

Load Cap Control

Output

Buffer

Load

Caps

VDD1

27 MHz

Pullable

Crystal

VIN

X1

GND

GND

Oscillator