BU2279F Datasheet, PDF (2/2 Pages) Rohm – Clock generator for PC

Multimedia ICs
BU2279F
zElectric Characteristics (Unless any specification, Vcc=3.3V, Ta=25°C, Crystal frequency=13.500MHz)
Parameter
Symbol
Min. Typ. Max. Unit
Conditions
Output "L" voltage
Output "H" voltage
Operation current
VCLK
SCLK
VOL
VOH
IDD
VCLK
SCLK
−
−
0.4
24
−
−
−
30
60
−
54.00
−
−
33.333
−
V
V
mA
MHz
MHz
IOL=4.0mA
IOH=−4.0mA
No load
Xtal+ 160 20 2
Xtal+ 400 27 6
Design assurances
VCLK Duty
Duty V
45
50
55
% Measured at 1/2VDD
SCLK Duty
Duty S
48
53
58
% Measured at 1/2VDD
Jitter1
Jstd1
−
80
−
psec Jitter 1σ
Jitter2
Jstd2
−
400
−
psec Jitter MIN=MAX
Rise time
tr
−
2.5
−
nsec
Fall time
tr
−
2.5
−
nsec
LOCK time of output
tLOCK
−
−
1
msec ∗
Remarks ) The output frequency is calculated from the input frequency of XTALIN. The value of output frequency above is the case of input frequency is 13.5MHz.
The values of Jitter above are the center value of 10000 sampling by time interval analyzer.
∗) The time for output frequency to be stabled after the power supply become 3.0V.
zApplication circuit
Fixed to "L"
1 ^CTRL1
OE ₁₆
2 TEST1
CTRL3 15
Fixed to "L"
Fixed to "L"
3 CTRL2
TEST2 14
4 AGND
AVDD 13
5 DGND
DVDD 12
6 DVDD
0.1µF
7 XTALIN
33.3MHz output
SCLK 11
DVDD 10
8 XTALOUT
BU2279F
54MHz output
VCLK 9
0.1µF
0.1µF
0.1µF
Remarks) The IC is basically needed to be on the board. (Unless it is on the board, the characteristics are not guaranteed.) Decoupling capacitance(0.1µF)
is needed to be placed between 13PIN(AVDD) and 4PIN(AGND).Decoupling capacitance(0.1µF)is needed to be placed between 16PIN(DVDD)
10PIN(DVDD), 12PIN(DVDD) and 5PIN(DGND) each.
To adjust the frequency of crystal, place a certain value of capacitance(pF) between 7 or 8PIN and DGND.
2pin and 4pin are needed to be fixed to "OPEN" through the operation.
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