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2010.04 - Rev.C

Voltage Detector ICs

Bipolar

Voltage Detector ICs

BD47□□G series

 Description

The BD47□□G Series is a reset IC that was developed to prevent system errors at transient state when the power of CPU

or logic circuit switches ON/OFF or momentary shut down. These ICs consist of three terminals (power supply, GND and

reset output) to detect power supply voltages and outputs reset signals of various systems. These ICs are ultra-compact

and are realized low current consumption, making them ideal for portable products.

 Features

1) Detection voltage range: 0.1-volt step line-up 1.9~4.6V (Typ.)

2) High accuracy voltage detection: ±1%

3) Low current consumption

4) Open collector “L” reset output

5) Compact SSOP5 package

 Applications

All electronic devices that use microcontrollers and logic circuits

 Selection Guide

 Lineup

Marking

Detection

Voltage

Part Number Marking

Detection

Voltage

Part Number Marking

Detection

Voltage

Part Number

B2 4.6V BD4746 BR 3.6V BD4736 BH 2.6V BD4726

B1 4.5V BD4745 BQ 3.5V BD4735 BG 2.5V BD4725

BZ 4.4V BD4744 BP 3.4V BD4734 BF 2.4V BD4724

BY 4.3V BD4743 B4 3.3V BD4733 BE 2.3V BD4723

BX 4.2V BD4742 BN 3.2V BD4732 BD 2.2V BD4722

BW 4.1V BD4741 BM 3.1V BD4731 BC 2.1V BD4721

BV 4.0V BD4740 BL 3.0V BD4730 BB 2.0V BD4720

BU 3.9V BD4739 BK 2.9V BD4729 BA 1.9V BD4719

BT 3.8V BD4738 BJ 2.8V BD4728

BS 3.7V BD4737 B3 2.7V BD4727

No. Specifications Description

Detection Voltage

Example: Voltage range over 1.9V~4.6V in

0.1V increments.

2.9V is marked as “29”

No.10006ECT05

Part Number : BD47 G

Summary of content (8 pages)

PAGE 1
Voltage Detector ICs Bipolar Voltage Detector ICs No.10006ECT05 BD47□□G series  Description The BD47□□G Series is a reset IC that was developed to prevent system errors at transient state when the power of CPU or logic circuit switches ON/OFF or momentary shut down. These ICs consist of three terminals (power supply, GND and reset output) to detect power supply voltages and outputs reset signals of various systems.
PAGE 2
Technical Note BD47□□G series  Absolute maximum ratings (Ta=25°C) Parameter Power Supply Voltage Output Voltage *1 *2 Power Dissipation Operating Temperature Ambient Storage Temperature Symbol Vcc-GND Vout Limits -0.3 ~ +10 -0.3 ~ +10 Unit V V Pd Topr Tstg 540 -40 ~ +75 -55 ~ +125 mW °C °C *1 When a ROHM standard circuit board (70mm×70mm×1.6mm glass epoxy board) is mounted. *2 When used at temperatures higher than Ta=25°C, the power is reduced by 5.
PAGE 3
Technical Note BD47□□G series 7 6 5 4 3 2 Icc1=1.34μA Icc2=1.46μA 1 0 0 1 2 3 4 5 6 7 8 6 【BD4729G】 700 600 500 400 IOL=12.194mA at Vo=400mV 300 200 100 0 9 10 0 VCC SUPPLY VOLTAGE ：VCC [V] 600 500 400 VOPL =0.675V 300 200 100 DETECTION VOLTAGE： VS[V] OUTPUT VOLTAGE： VOUT [mV] 700 10 15 20 25 0 0.5 1 1.5 2 2 VS=2.90V 2.5 VS=2.95V 1 30 【BD4729G】 3.3 3.1 -0.007%/℃ 2.9 2.7 2.5 ~ ~ 2.
PAGE 4
Technical Note BD47□□G series  Explanation of Operation BD47□□G series has the detection voltages and release voltages as threshold voltages and, as the voltages applied to the input reach their respective threshold voltages, the output switches from “High” to “Low” and from “Low” to “High”. The release voltage has a hysteresis that is the detection voltage +50mV (Typ.), preventing chattering in the output. When the input is greater than the release voltage, the output is in a “High” state.
PAGE 5
Technical Note BD47□□G series  Circuit Applications 1) The following is an example of an application circuit using Reset IC for normal power supply detection. BD47□□G series requires a pull up resistor on the output terminal. The pull up resister value should be decided. As the application with enough confirmation of power supply level and output current capability.
PAGE 6
Technical Note BD47□□G series  Operation Notes 1. Absolute maximum range Absolute Maximum Ratings are those values beyond which the life of a device may be destroyed. We cannot be defined the failure mode, such as short mode or open mode. Therefore a physical security countermeasure, like fuse, is to be given when a specific mode to be beyond absolute maximum ratings is considered. 2. GND potential GND terminal should be a lowest voltage potential every state.
PAGE 7
Technical Note BD47□□G series  Part Number Selection B D 4 7 1 Bipolar Reset 9 － G T R Detection Voltage SSOP5 Taping Specifications Example: 1.9V19 Package Embossed Taping SSOP5 5 4 1 2 0.2Min. +0.2 1.6 −0.1 2.8±0.2 +6° 4° −4° 2.9±0.
PAGE 8
Notice Notes No copying or reproduction of this document, in part or in whole, is permitted without the consent of ROHM Co.,Ltd. The content specified herein is subject to change for improvement without notice. The content specified herein is for the purpose of introducing ROHM's products (hereinafter "Products"). If you wish to use any such Product, please be sure to refer to the specifications, which can be obtained from ROHM upon request.