VT98501 Ver la hoja de datos (PDF) - Vaishali Semiconductor
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Fabricante
VT98501 Datasheet PDF : 4 Pages
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VT98501
Advance Information
AC Characteristics
Table 7. AC Characteristics
VDD = 3V to 3.6V over the operating temperature range
Symbol
Parameter
fosc
Input Crystal Frequency
Condition
Min Typ Max Units
5
27 MHz
fin
Input clock frequency
2
50 MHz
fout
Output Frequency,
14
160 MHz
tr
Output Clock Rise Time
0.8 to 2.0V
1
ns
tf
Output Clock Fall Time
2.0 to 0.8V
1
ns
tod
Output Clock Duty Cycle
1.5 V, up to 160 MHz 45 49 to 51 55
%
PLL Bandwidth
10
kHz
TPZH, TPZL Output Enable Time, OE high to output on
50
ns
TPHZ, TPLZ Output Disable time, OE low to Tri-state
50
ns
tjit (abs)
Absolute Clock period Jitter
Deviation from mean
70
ps
tjit (sigma) 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
equation, where CL is the crystal load capacitance. Crystal capacitors (pf) = (CL - 5) x 2. For example, a crystal with a load
capacitance of 16 pF should have 22 pF tuning capacitors.
Figure 3. External Crystal Connection Block Diagram
Crystal
X2
X1
CX2
3C3Xp1 F
CX1
External Crystal
Load Capacitors
OE
XTAL OSC
PLL
CLOCK
GGEENN.
CLK3
106.25MHz
Ordering Information
Part Number
VT98501S1
VT98501S1X
VT98501/D
Marking
VT98501S1
VT98501S1
Shipping/Packaging
Tubes
Tape & Reel
No. of Pins
8
8
Package
SOIC
SOIC
Temperature
0oC to +70oC
0oC to +70oC
0oC to +70oC
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
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