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BU2285FV,BU2363FV
Technical Note
3/16
www.rohm.com
2009.04 - Rev.A
2009 ROHM Co., Ltd. All rights reserved.
◎BU2363FV(VDD=3.3V, Ta=25℃, Crystal frequency 36.8640MHz, unless otherwise specified.)
Parameter
Symbol
Limits
Unit
Conditions
Min.
Typ.
Max.
Output L voltage
VOL
－
0.4
V
IOL=4.0mA
Output H voltage
VOH
2.4
－
V
IOH=－4.0mA
Consumption current
IDD
－
30
50
mA
At no load
CLK54M
－
54.0000
－
MHz
XTAL×375 / 64 / 4
CLK27M
－
27.0000
－
MHz
XTAL×375 / 64 / 8
CLK33M
－
33.8688
－
MHz
XTAL×147 / 40 / 4
CLK16M
－
16.9344
－
MHz
XTAL×147 / 40 / 8
CLK768FS1
CLK768_H
－
36.8640
－
MHz
At FSEL=OPEN,
XTAL output
CLK768_L
－
33.8688
－
MHz
At FSEL=L,
XTAL×147 / 40 / 4
CLK384FS2
CLK384_H
－
18.4320
－
MHz
At FSEL=OPEN,
XTAL / 2 output
CLK384_L
－
16.9344
－
MHz
At FSEL=L,
XTAL×147 / 40 / 8
Duty
45
50
55
%
Measured at a voltage of 1/2VDD
Period-Jitter 1
σ
P-J 1
σ
－
50
－
psec
*1
Period-Jitter MIN-MAX
P-J
MIN-MAX
－
300
－
psec
*2
Rise Time
Tr
－
2.5
－
nsec
Period of transition time required for the clock
output to reach 80% from 20% of VDD
Fall Time
Tf
－
2.5
－
nsec
Period of transition time required for the clock
output to reach 20% from 80% of VDD
Output Lock-Time
Tlock
－
1
msec *3
C/N 54M
-65
-80
－
dB
*4
(At a maximum load)
C/N 33M
-50
-60
－
dB
*4
(At a maximum load)
Note) The output frequency is determined by the arithmetic (frequency division) expression of a frequency input to XTALIN.
If the input frequency is set to 36.8640MHz, the output frequency will be as listed above.
Common to BU2285FV and BU2363FV:
*1
Period-Jitter
1
σ
This parameter represents standard deviation (
1 σ) on cycle distribution data at the time when the output clock cycles
are sampled 1000 times consecutively with the TDS7104 Digital Phosphor Oscilloscope of Tektronix Japan, Ltd.
*2
Period-Jitter
MIN-MAX
This parameter represents a maximum distribution width on cycle distribution data at the time when the output clock
cycles are sampled 1000 times consecutively with the TDS7104 Digital Phosphor Oscilloscope of Tektronix Japan, Ltd.
*3
Output Lock-Time
The Lock-Time represents elapsed time after power supply turns ON to reach a 3.0V voltage, after the system is
switched from Power-Down state to normal operation state, or after the output frequency is switched, until it is stabilized
at a specified frequency, respectively.
BU2363FV
*4
Make measurements with settings of SPAN to 100kHz, RBW to 1kHz, and VBW to 100Hz taking the middle point
between (54.0000MHz
20kHz) and (33.8688MHz20kHz) as a measurement point.
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