VT98501

Advance Information

2001-03-05

Page 4

MDST-0009-00

Vaishali Semiconductor

1300 White Oaks Road, Ste 200

Campbell

CA 95008

Ph. 408.377.6060

Fax 408.377.6063

AC Characteristics

Table 7. AC Characteristics

VDD = 3V to 3.6V over the operating temperature range

Symbol

Parameter

Condition

Min

Typ

Max

Units

Input Crystal Frequency

5

27

MHz

Input clock frequency

2

50

MHz

Output Frequency,

14

160

MHz

Output Clock Rise Time

0.8 to 2.0V

1

ns

Output Clock Fall Time

2.0 to 0.8V

1

ns

Output Clock Duty Cycle

1.5 V, up to 160 MHz

45

49 to 51

55

%

PLL Bandwidth

10

kHz

Output Enable Time, OE high to output on

50

ns

Output Disable time, OE low to Tri-state

50

ns

Absolute Clock period Jitter

Deviation from mean

70

ps

One Sigma Clock Period Jitter

25

ps

Note: External Crystal Connection

.

The external crystal should be connected in as close physical proximity to the VT98501 as possible. The crystal should be a

fundamental mode, parallel resonant. Do not use third overtone. Decoupling capacitors of 0.01

µF and 0.1 µF should be connected

between VDD and Ground. Capacitors should be mounted as close to the chip as possible. A 33Ω termination resistor may be

mounted in series with the clock output in order to minimize ringing and reflections.

Precision tuning of the crystal can be achieved by connecting a capacitor from pin X1 to ground and another from pin X2 to

ground. The value of these capacitors is determined by the crystal load capacitance. The value can be determined using the following

capacitance of 16 pF should have 22 pF tuning capacitors.

Figure 3. External Crystal Connection Block Diagram

Ordering Information

Part Number

Marking

Shipping/Packaging

No. of Pins

Package

Temperature

VT98501S1

VT98501S1

Tubes

8

SOIC

0

VT98501S1X

VT98501S1

Tape & Reel

8

SOIC

0

VT98501/D

0

Crystal

CLK3

106.25MHz

X2

X1

33pF

XTAL OSC

PLL

CLOCK

GEN.

OE

External Crystal

Load Capacitors

CLK

X2

X1

XTAL OSC

PLL

CLOCK

GEN

OE

External Crystal

Load Capacitors