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BU2285FV,BU2363FV
Technical Note
14/16
www.rohm.com
2009.04 - Rev.A
2009 ROHM Co., Ltd. All rights reserved.
OPEN:Enable
1:VDD2
16:OE
L
:Disable
0.1uF
2:VSS2
15:CLK33M
33.8688MHz
54.0000MHz
3:CLK254M
14:FSEL
OPEN:48.0kHz type
L
:44.1kHz type
27.0000MHz
4:CLK27M
13:CLK16M
16.9344MHz
5:AVDD
12:DVDD
0.1uF
6:AVSS
11:DVSS
7:XTALIN
10:768FS1
36.8640MHz
or 33.8688MHz
8:XTALOUT
9:384FS2
18.4320MHz
or 16.9344MHz
BU2363FV
●Example of application circuit
◎BU2363FV
Pin Function
PIN No.
PIN Name
PIN Function
1
VDD2
27MHz, 54MHz power supply
2
VSS2
27MHz, 54MHzGND
3
CLK54M
54.0000MHz output
4
CLK27M
27.0000MHz output
5
AVDD
Analog power supply
6
AVSS
Analog GND
7
XTALIN
Crystal input terminal
8
XTALOUT
Crystal output terminal
9
384FS2
FSEL=OPEN:18.4320MHz, FSEL=L:16.9344MHz
10
768FS1
FSEL=OPEN:36.8640MHz, FSEL=L:33.8688MHz
11
DVSS
Digital GND
12
DVDD
Digital power supply
13
CLK16M
16.9344MHz output
14
FSEL
9, 10PIN output selection(with pull-up)
OPEN:18.4320MHz(9PIN), 36.8640MHz(10PIN)
L:16.9344MHz(9PIN), 33.8688MHz(10PIN)
15
CLK33M
33.8688MHz output
16
OE
Output enable (with pull-up), OPEN:enable, L:disable
Note) Basically, mount ICs to the printed circuit board for use.
(If the ICs are not mounted to the printed circuit board, the characteristics of ICs may not be fully demonstrated.)
Mount 0.1
F capacitors in the vicinity of the IC PINs between 1PIN (VDD2) and 2PIN (VSS2), 5PIN (AVDD) and 6PIN (AVSS), 11PIN (DVSS) and 12PIN
(DVDD), respectively.
Depending on the conditions of the printed circuit board, mount an additional electrolytic capacitor between the power supply and GND terminal.
For EMI protection, it is effective to put ferrite beads in the origin of power supply to be fed to BU2363FV from the printed circuit board or to insert a
capacitor (of 1
or less), which bypasses high frequency desired, between the power supply and the GND terminal.
Even though we believe that the example of recommended circuit is worth of a recommendation, please be sure to thoroughly recheck the characteristics
before use.
Fig.86
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