Preliminary
VT73127
27 MHz 3.3V VCXO with Output Enable
Applications
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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
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•=
•=
3.3V operating voltage
Uses inexpensive pullable crystals
12mA drive capability at TTL levels
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•=
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On-chip oscillator with 200 ppm pull range (±100 ppm)
Active High output enable
Die only
Figure 1. Functional Block Diagram
VDD1
VDD2
VIN
X2
27 MHz
Pullable
Crystal
Load Cap Control
Output
Buffer
Load
Caps
Oscillator
CLK
OE
X1
GND
GND
2001-08-06
Vaishali Semiconductor
Page
1
www.vaishali.com
747 Camden Avenue, Suite C Campbell
MDST-0012-02
CA 95008
Ph. 408.377.6060
Fax 408.377.6063
VAISH [ VAISHALI SEMICONDUCTOR ]
