VT73127

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....