NB3N502DG

NB3N502
http://onsemi.com
4
APPLICATIONS INFORMATION
High Frequency CMOS/TTL Oscillators
The NB3N502, along with a low frequency fundamental
mode crystal, can build a high frequency CMOS/TTL output
oscillator. For example, a 20 MHz crystal connected to the
NB3N502 with the 5X output selected (S1 = L, S0 = H)
produces a 100 MHz CMOS/TTL output clock.
External Components
Decoupling Instructions
In order to isolate the NB3N502 from system power
supply, noise decoupling is required. The 0.01 mF
decoupling capacitor has to be connected between V
DD
and
GND on pins 2 and 3. It is recommended to place
decoupling capacitors as close as possible to the NB3N502
device to minimize lead inductance. Control input pins can
be connected to device pins V
DD
or GND, or to the V
DD
and
GND planes on the board.
Series Termination Resistor Recommendation
A 33 W series terminating resistor can be used on the
CLKOUT pin.
Crystal Load Capacitors Selection Guide
The total onchip capacitance is approximately 12 pF per
pin (C
IN1
and C
IN2
). A parallel resonant, fundamental mode
crystal should be used.
The device crystal connections should include pads for
small capacitors from X1/CLK to ground and from X2 to
ground. These capacitors, C
L1
and C
L2
, are used to adjust the
stray capacitance of the board to match the nominally
required crystal load capacitance (C
LOAD
(crystal)).
Because load capacitance can only be increased in this
trimming process, it is important to keep stray capacitance
to a minimum by using very short PCB traces (and no vias)
between the crystal and device. Crystal load capacitors, if
needed, must be connected from each of the pins X1 and X2
to ground. The load capacitance of the crystal (C
LOAD
(crystal)) must be matched by total load capacitance of the
oscillator circuitry network, C
INX
, C
SX
and C
LX
, as seen by
the crystal (see Figure 3 and equations below).
R
C
IN1
12 pF
C
IN2
12 pF
G
Internal
to Device
X2
X1/CLK
C
S1
C
S2
C
L1
C
L2
Crystal
C
LOAD1
= C
IN1
+ C
S1
+ C
L1
[Total capacitance on X1/CLK]
C
LOAD2
= C
IN2
+ C
S2
+ C
L2
[Total capacitance on X2]
C
IN1
[ C
IN2
[ 12 pF (Typ) [Internal capacitance]
C
S1
[ C
S2
[ 5 pF (Typ) [External PCB stray capacitance]
C
LOAD1,2
= 2 S C
LOAD
(Crystal)
C
L2
= C
LOAD2
C
IN2
C
S2
[External load capacitance on X2]
C
L1
= C
LOAD1
C
IN1
C
S1
[External load capacitance on X1/CLK]
Example 1: Equal stray capacitance on PCB
C
LOAD
(Crystal) = 18 pF (Specified by the crystal manufacturer)
C
LOAD1
= C
LOAD2
= 36 pF
C
IN1
= C
IN2
= 12 pF
C
S1
= C
S2
= 6 pF
C
L1
= 36 12 6 = 18 pF
C
L2
= 36 12 6 = 18 pF
Example 2: Different stray capacitance on PCB trace X1/CLK vs. X2
C
LOAD
(Crystal) = 18 pF
C
LOAD1
= C
LOAD2
= 36 pF
C
IN1
= C
IN2
= 12 pF
C
S1
= 4 pF & C
S2
= 8 pF
C
L1
= 36 12 4 = 20 pF
C
L2
= 36 12 8 = 16 pF
Figure 3. Using a Crystal as Reference Clock
NB3N502
http://onsemi.com
5
PACKAGE DIMENSIONS
SOIC8 NB
CASE 75107
ISSUE AK
SEATING
PLANE
1
4
58
N
J
X 45
_
K
NOTES:
1. DIMENSIONING AND TOLERANCING PER
ANSI Y14.5M, 1982.
2. CONTROLLING DIMENSION: MILLIMETER.
3. DIMENSION A AND B DO NOT INCLUDE
MOLD PROTRUSION.
4. MAXIMUM MOLD PROTRUSION 0.15 (0.006)
PER SIDE.
5. DIMENSION D DOES NOT INCLUDE DAMBAR
PROTRUSION. ALLOWABLE DAMBAR
PROTRUSION SHALL BE 0.127 (0.005) TOTAL
IN EXCESS OF THE D DIMENSION AT
MAXIMUM MATERIAL CONDITION.
6. 75101 THRU 75106 ARE OBSOLETE. NEW
STANDARD IS 75107.
A
B
S
D
H
C
0.10 (0.004)
DIM
A
MIN MAX MIN MAX
INCHES
4.80 5.00 0.189 0.197
MILLIMETERS
B 3.80 4.00 0.150 0.157
C 1.35 1.75 0.053 0.069
D 0.33 0.51 0.013 0.020
G 1.27 BSC 0.050 BSC
H 0.10 0.25 0.004 0.010
J 0.19 0.25 0.007 0.010
K 0.40 1.27 0.016 0.050
M 0 8 0 8
N 0.25 0.50 0.010 0.020
S 5.80 6.20 0.228 0.244
X
Y
G
M
Y
M
0.25 (0.010)
Z
Y
M
0.25 (0.010) Z
S
X
S
M
____
1.52
0.060
7.0
0.275
0.6
0.024
1.270
0.050
4.0
0.155
ǒ
mm
inches
Ǔ
SCALE 6:1
*For additional information on our PbFree strategy and soldering
details, please download the ON Semiconductor Soldering and
Mounting Techniques Reference Manual, SOLDERRM/D.
SOLDERING FOOTPRINT*
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to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability
arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages.
“Typical” parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All
operating parameters, including “Typicals” must be validated for each customer application by customer’s technical experts. SCILLC does not convey any license under its patent rights
nor the rights of others. SCILLC products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications
intended to support or sustain life, or for any other application in which the failure of the SCILLC product could create a situation where personal injury or death may occur. Should
Buyer purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and hold SCILLC and its officers, employees, subsidiaries, affiliates,
and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death
associated with such unintended or unauthorized use, even if such claim alleges that SCILLC was negligent regarding the design or manufacture of the part. SCILLC is an Equal
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PUBLICATION ORDERING INFORMATION
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USA/Canada
Europe, Middle East and Africa Technical Support:
Phone: 421 33 790 2910
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Phone: 81358171050
NB3N502/D
LITERATURE FULFILLMENT:
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Phone: 3036752175 or 8003443860 Toll Free USA/Canada
Fax: 3036752176 or 8003443867 Toll Free USA/Canada
Email: orderlit@onsemi.com
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Order Literature: http://www.onsemi.com/orderlit
For additional information, please contact your local
Sales Representative

NB3N502DG

Mfr. #:
Manufacturer:
ON Semiconductor
Description:
Phase Locked Loops - PLL PLL CLK MULTIPLIER
Lifecycle:
New from this manufacturer.
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