Preliminary
VT73127 27 MHz 3.3V VCXO with Output Enable
Applications
•= Crystal-driven clock source
General Descriptio...
Preliminary
VT73127 27 MHz 3.3V VCXO with Output Enable
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
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
VT73127 Figure 2. Pad Configuration VT73127/D X1
1 9 8 7 5 6
Preliminary
X2 GND VDD2 OE
VDD1 VIN GND
2 3 4
CLK
Table 1. Pad Description Name
X1 VDD1 VIN GND CLK OE VDD2 GND X2
Pad
1 2 3 4 5 6 7 8 9
Type
Xi P I P O I P P Xi Core VDD. Connect to 3.3V
Description
Crystal connection. Connect to a 27 MHz pullable crystal
Tuning control input. Zero to 3.3V signal controls the frequency of the VCXO. Connect to ground. Clock output Active HIGH output enable....