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VT98521/DW

3.3V Clock Multiplier

Vaishali Semiconductor  

Applications

•= Low cost general-purpose clock source

VT98521

3.3V Clock Multiplier

General Description

The VT98521 is a 3.3V CMOS, clock multiplier integrated circuit. The device provides an excellent quality

high frequency output clock from a lower frequency crystal or clock input. Tri-level selection inputs S0 and

S1 are used to select any one of eight multipliers, stored in the on-board ROM, and apply it to the input to

produce the desired output, up to 220 MHz. Phase Locked Loop (PLL) technology allows the device to use

an input signal from an inexpensive crystal. When Output Enable (OE) is low, the clock output is in high

impedance state.

The VT98521, when used with an inexpensive crystal, provides a cost-effective clock source for most

electronic systems.

Features

•= Low phase noise

•= Zero ppm multiplication error

•= Input clock frequency 5 - 50 MHz.

•= Input crystal frequency 5 – 27 MHz

•= Output clock frequencies up to 220 MHz.

•= 5V-tolerant inputs and output

•= Fully Compatible with all popular CPUs

•= Duty Cycle - 45/55 up to 160 MHz.

- 40/60 160 MHz to 220 MHz

•= 25mA drive capability at TTL levels

•= High-Z output for board level testing

Figure 1. Functional Block Diagram

Figure 2. Pin Assignment

VDD

GND

S0

S1

Clock or

Xtal

input

X1/ICLK

Xtal.

Osc.

X2

PLL

Clock

Multiplier

&

ROM

Output

CLK

Buffer

Optional

caps

Output Enable

8-pin SOIC/MSOP

X1/ICLK

1

VDD

2

GND

3

S1

4

8

X2

7

OE

6

S0

5

CLK

2002-02-25

Vaishali Semiconductor

Page 1

www.vaishali.com

747 Camden Avenue, Suite C Campbell

CA 95008

Ph. 408.377.6060

MDST-0017-02

Fax 408.377.6063

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