
BU2285FV,BU2363FV
Technical Note
2/16
www.rohm.com
2009.04 - Rev.A
2009 ROHM Co., Ltd. All rights reserved.
●Electrical characteristics
◎BU2285FV(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 / 128 / 2
CLK27M
-
27.0000
-
MHz
XTAL×375 / 128 / 4
CLKDAC
CLKDAC_H
-
27.0000
-
MHz
At CTRLB=OPEN,
XTAL×375 / 128 / 4
CLKDAC_L
-
13.5000
-
MHz
At CTRLB=L,
XTAL×375 / 128 / 8
CLK33M
-
33.8688
-
MHz
XTAL×147 / 40 / 4
CLK16M
-
16.9344
-
MHz
XTAL×147 / 40 / 8
CLKA
CLKA_H
-
36.8640
-
MHz
At CTRLA=OPEN,
XTAL output
CLKA_L
-
33.8688
-
MHz
At CTRLA=L,
XTAL×147 / 40 / 4
CLKB
CLKB_H
-
18.4320
-
MHz
At CTRLA=OPEN,
XTAL / 2 output
CLKB_L
-
16.9344
-
MHz
At CTRLA=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
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.