BU2396KN-E2 Rohm Semiconductor, BU2396KN-E2 Datasheet - Page 15

• Manufacturer Part Number: BU2396KN-E2
• Description: IC, CLOCK GENERATOR, 3CH, VQFN20
• Manufacturer: Rohm Semiconductor

Specifications of BU2396KN-E2

• Clock External Input: Yes
• Supply Voltage Range: 3V To 3.6V
• Digital Ic Case Style: VQFN
• No. Of Pins: 20
• Operating Temperature Range: -5°C To +70°C
• Svhc: No SVHC (18-Jun-2010)
• Base: RoHS Compliant
• Package / Case: VQFN
• Base Number: 2396
• Rohs Compliant: Yes
• Operating Frequency Max: 12MHz

●Cautions on Use
1. Absolute Maximum Ratings
2. Recommended operating conditions
3. Reverse connection of power supply connector
4. Power supply line
5. GND voltage
6. Short circuit between terminals and erroneous mounting
7. Operation in strong electromagnetic field
8. Inspection with set PCB
9. Input terminals
10. Ground wiring pattern
11. External capacitor
These conditions represent a range within which characteristics can be provided approximately as expected. The electrical
characteristics are guaranteed under the conditions of each parameter.
The reverse connection of power supply connector can break down ICs. Take protective measures against the breakdown
due to the reverse connection, such as mounting an external diode between the power supply and the IC’s power supply
terminal.
Design PCB pattern to provide low impedance for the wiring between the power supply and the GND lines.
In this regard, for the digital block power supply and the analog block power supply, even though these power supplies has
the same level of potential, separate the power supply pattern for the digital block from that for the analog block, thus
suppressing the diffraction of digital noises to the analog block power supply resulting from impedance common to the wiring
patterns. For the GND line, give consideration to design the patterns in a similar manner.
Furthermore, for all power supply terminals to ICs, mount a capacitor between the power supply and the GND terminal. At
the same time, in order to use an electrolytic capacitor, thoroughly check to be sure the characteristics of the capacitor to be
used present no problem including the occurrence of capacity dropout at a low temperature, thus determining the constant.
Make setting of the potential of the GND terminal so that it will be maintained at the minimum in any operating state.
Furthermore, check to be sure no terminals are at a potential lower than the GND voltage including an actual electric
transient.
In order to mount ICs on a set PCB, pay thorough attention to the direction and offset of the ICs. Erroneous mounting can
break down the ICs. Furthermore, if a short circuit occurs due to foreign matters entering between terminals or between the
terminal and the power supply or the GND terminal, the ICs can break down.
Be noted that using ICs in the strong electromagnetic field can malfunction them.
On the inspection with the set PCB, if a capacitor is connected to a low-impedance IC terminal, the IC can suffer stress.
Therefore, be sure to discharge from the set PCB by each process. Furthermore, in order to mount or dismount the set PCB
to/from the jig for the inspection process, be sure to turn OFF the power supply and then mount the set PCB to the jig. After
the completion of the inspection, be sure to turn OFF the power supply and then dismount it from the jig. In addition, for
protection against static electricity, establish a ground for the assembly process and pay thorough attention to the
transportation and the storage of the set PCB.
In terms of the construction of IC, parasitic elements are inevitably formed in relation to potential. The operation of the
parasitic element can cause interference with circuit operation, thus resulting in a malfunction and then breakdown of the
input terminal. Therefore, pay thorough attention not to handle the input terminals, such as to apply to the input terminals a
voltage lower than the GND respectively, so that any parasitic element will operate. Furthermore, do not apply a voltage to
the input terminals when no power supply voltage is applied to the IC. In addition, even if the power supply voltage is applied,
apply to the input terminals a voltage lower than the power supply voltage or within the guaranteed value of electrical
characteristics.
An excess in the absolute maximum ratings, such as supply voltage , temperature range of operating conditions, etc., can
break down devices, thus making impossible to identify breaking mode such as a short circuit or an open circuit. If any
special mode exceeding the absolute maximum ratings is assumed, consideration should be given to take physical safety
measures including the use of fuses, etc.
If small-signal GND and large-current GND are provided, It will be recommended to separate the large-current GND pattern
from the small-signal GND pattern and establish a single ground at the reference point of the set PCB so that resistance to
the wiring pattern and voltage fluctuations due to a large current will cause no fluctuations in voltages of the small-signal
GND. Pay attention not to cause fluctuations in the GND wiring pattern of external parts as well.
In order to use a ceramic capacitor as the external capacitor, determine the constant with consideration given to a
degradation in the nominal capacitance due to DC bias and changes in the capacitance due to temperature, etc.
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