BU7331EKN-E2 Datasheet, PDF (4/21 Pages) Rohm – 3ch Programmable Clock Generator

BU7331EKN
●Typical Application Circuit
SCL
⑳
RST
①
1.8V±0.15V
～uH
L
②
③
0.1uF
④
⑤
3.3V～1.4V
SDA
0.1uF
⑲
⑱
⑰
Serial I/F Control Register
PLL Analog1
Analog2
Analog3
PLL Analog1
Analog2
Analog3
PLL Analog1
Analog2
Analog3
Technical Note
CLK1：Output
⑯
3.3V～1.4V
⑮
0.1uF
⑭
CLK2：Output
⑬
3.3V～1.4V
⑫
0.1uF
⑪
⑥
⑦
⑧
⑨
⑩
0.1uF
1MΩ
3.3V～1.4V
Input Frequency : 5 ～ 48MHz ( 5 ～ 27MHz at Xtal Use )
0.6Vp-p ～ VDD_COREp-p
CLK3：Output
Notes)
・Basically, mount the BU7331EKN on the board and use it.
(Unless it is mounted on the board, it may not demonstrate the full characteristics.)
・Mount a 0.1-µF capacitor in the vicinity of BU7331EKN PIN between PIN 2 - 3 (VDD_CORE) and PIN 4 - 5 (VSS_CORE),
PIN 8 (VDD_CLK3) and PIN 9 (VSS_CLK3), PIN 11 (VSS_CLK2) and PIN 12 (VDD_CLK2), PIN 14 (VSS_CLK1) and PIN
15 (VDD_CLK1), and PIN 17 (VSS_SIF) and PIN 18 (VDD_SIF), respectively.
・Depending on the conditions of the board, mount an additional electrolytic capacitor between the power supply and GND.
・For EMI protection, it is effective to put ferrite beads in the origin of power to be supplied to the BU7331EKN from the
board or to insert a capacitor (of not more than 1), which bypasses high frequency desired, between the power supply
and the GND.
・We believe that this typical application circuit is to be recommended. However, to use it, make further thorough check for
the characteristics.
・For ICs with more than two power supplies, instantaneous rush currents may flow due to the order in which the power
supplies turn ON or delay in turning ON them. To avoid that, pay careful attention to power supply coupling capacitance,
and the width and routing of power supply wirings and GND pattern wirings.
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2009.04 - Rev.A