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BD4730G-TR Datasheet(PDF) 10 Page - Rohm

Part # BD4730G-TR
Description  Bipolar Voltage Detector ICs
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Manufacturer  ROHM [Rohm]
Direct Link  http://www.rohm.com
Logo ROHM - Rohm

BD4730G-TR Datasheet(HTML) 10 Page - Rohm

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Datasheet
10/10
BD47xx series
TSZ02201-0R7R0G300020-1-2
© 2013 ROHM Co., Ltd. All rights reserved.
22.May.2013 Rev.006
www.rohm.com
TSZ22111
15
001
Operational Notes
1)
Absolute maximum ratings
Operating the IC over the absolute maximum ratings may damage the IC. The damage can either be a short circuit
between pins or an open circuit between pins. Therefore, it is important to consider circuit protection measures, such
as adding a fuse, in case the IC is operated over the absolute maximum ratings.
2)
Ground Voltage
The voltage of the ground pin must be the lowest voltage of all pins of the IC at all operating conditions. Ensure that no
pins are at a voltage below the ground pin at any time, even during transient condition.
3)
Recommended operating conditions
These conditions represent a range within which the expected characteristics of the IC can be approximately obtained.
The electrical characteristics are guaranteed under the conditions of each parameter.
4)
Bypass Capacitor for Noise Rejection
To help reject noise, put a 1µF capacitor between VDD pin and GND and 1000pF capacitor between VOUT pin and GND.
Be careful when using extremely big capacitor as transient response will be affected.
5)
Short between pins and mounting errors
Be careful when mounting the IC on printed circuit boards. The IC may be damaged if it is mounted in a wrong
orientation or if pins are shorted together. Short circuit may be caused by conductive particles caught between the pins.
6)
Operation under strong electromagnetic field
Operating the IC in the presence of a strong electromagnetic field may cause the IC to malfunction.
7)
The VDD line impedance might cause oscillation because of the detection current.
8)
A VDD to GND capacitor (as close connection as possible) should be used in high VDD line impedance condition.
9)
Lower than the mininum input voltage puts
the VOUT in high impedance state, and it must be VDD in pull up (VDD)
condition.
10) External parameters
The recommended parameter range for RL is 2k
Ω to 1MΩ. There are many factors (board layout, etc) that can affect
characteristics. Please verify and confirm using practical applications.
11) Power on reset operation
Please note that the power on reset output varies with the VDD rise time. Please verify the behavior in the actual
operation.
12) Testing on application boards
When testing the IC on an application board, connecting a capacitor directly to a low-impedance output pin may subject
the IC to stress. Always discharge capacitors completely after each process or step. The IC’s power supply should
always be turned off completely before connecting or removing it from the test setup during the inspection process. To
prevent damage from static discharge, ground the IC during assembly and use similar precautions during transport and
storage.
13) Rush current
When power is first supplied to the IC, rush current may flow instantaneously. It is possible that the charge current to
the parasitic capacitance of internal photo diode or the internal logic may be unstable. Therefore, give special
consideration to power coupling capacitance, power wiring, width of GND wiring, and routing of connections.


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