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. 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 No. Part Number : BD47 G 1 Specifications Detection Voltage Description Example: Voltage range over 1.9V~4.6V in 0.1V increments. 2.9V is marked as “29” 1 Lineup Marking B2 B1 BZ BY BX BW BV BU BT BS Detection Voltage 4.6V 4.5V 4.4V 4.3V 4.2V 4.1V 4.0V 3.9V 3.8V 3.7V Part Number Marking BD4746 BD4745 BD4744 BD4743 BD4742 BD4741 BD4740 BD4739 BD4738 BD4737 BR BQ BP B4 BN BM BL BK BJ B3 www.rohm.com © 2010 ROHM Co., Ltd. All rights reserved. Detection Voltage 3.6V 3.5V 3.4V 3.3V 3.2V 3.1V 3.0V 2.9V 2.8V 2.7V 1/7 Part Number Marking BD4736 BD4735 BD4734 BD4733 BD4732 BD4731 BD4730 BD4729 BD4728 BD4727 BH BG BF BE BD BC BB BA Detection Voltage 2.6V 2.5V 2.4V 2.3V 2.2V 2.1V 2.0V 1.9V Part Number BD4726 BD4725 BD4724 BD4723 BD4722 BD4721 BD4720 BD4719 2010.04 - Rev.C 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 5.4mW/°C Electrical characteristics (Unless Otherwise Specified Ta=25°C) Parameter Symbol Detection Voltage Vs Temperature Coefficient Of Detection Voltage Detection Hysteresis Voltage Transfer Delay Time ”H” Transfer Delay Time ”L” Reset Output Voltage ”L” Circuit Current ON Circuit Current OFF Threshold Operating Voltage Output Leak Current Reset Output Current ”L” Condition Vcc=HL Min. Vs (T) ×0.99 RL=4.7kΩ Vs/∆T RL=4.7kΩTa=-20~+75°C Designed Guarantee ∆Vs tPLH tPHL VOL Icc1 Icc2 VOPL IL IOL RL=4.7kΩ, Vcc＝LHL CL=100pF，RL=4.7kΩ *1 CL=100pF，RL=4.7kΩ *2 Vcc=Vs(min.)-0.05V, RL=4.7kΩ Vcc=Vs(min.)-0.05V, RL=∞ Vcc=Vs(typ.)/0.85V, RL=∞ RL=4.7kΩ，VOL≥0.4V Vcc=VOUT=10V Vo=0.4V, Vcc=Vs(min.)-0.05V Limit Typ. Max. Vs (T) ×1.01 Vs (T) Unit V - ±0.01 - %/°C 30 3.0 50 20 60 0.1 1.5 1.6 0.65 15.0 100 50 120 0.4 3.0 3.2 0.85 0.1 - mV µs µs V µA µA V µA mA Vs(T):Standard Detection Voltage（1.9V to 4.6V, 0.1V step） RＬ:Pull-up resistor to be connected between VOUT and power supply. CL:Capacitor to be connected between VOUT and GND. *1 tPLH:Vcc=(Vs(typ.)-0.4V)(Vs(typ.)+0.4V) *2 tPHL:Vcc=(Vs(typ.)+0.4V)(Vs(typ.)-0.4V) Designed Guarantee.(Outgoing inspection is not done on all products.) Block Diagrams VCC 5 TOP VIEW PIN No. Symbol Function 1 N.C. Unconnected Terminal 2 SUB Substrate* 3 GND GND 4 VOUT Reset Output 5 VCC 4 VOUT Vref SSOP5 3 Power Supply Voltage *Substrate Pin should be connected with GND GND Fig.1 www.rohm.com © 2010 ROHM Co., Ltd. All rights reserved. 2/7 2010.04 - Rev.C 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 ~ ~ 2.3 -20 -10 0 10 20 30 40 50 60 70 80 0 dVS=50mV 0 1 2 3 4 5 6 VCC SUPPLY VOLTAGE ：VcC [V] Fig.4 I/O Characteristics 2.5 【BD4729G】 2.0 1.5 1.0 0.5 0.0 -20 -10 0 10 20 30 40 50 60 70 80 VCC SUPPLY VOLTAGE ： VCC [V] TEMPERATURE ： Ta[℃] TEMPERATURE ： Ta[℃] Fig.5 Operating Limit Voltage Fig.6 Detection Voltage Fig.7 Circuit Current when ON 2.5 0.9 【BD4729G】 2.0 1.5 1.0 0.5 0.0 -20 -10 0 10 20 30 40 50 60 70 80 MINIMUM OPERATION VOLTAGE ： VOPL[V] CIRCUIT CURRENT WHEN OFF ： I CC2[mA] 5 3.5 800 3 Fig.3 “Low” Output Current 1000 【BD4729G】 4 OUTPUT VOLTAGE ： VOUT[mV] Fig.2 Circuit Current 900 【BD4729G】 5 0 500 【BD4729G】 0.8 0.7 0.6 0.5 0.4 -20 -10 0 10 20 30 40 50 60 70 80 OUTPUT VOLTAGE： VOUT [mV] CIRCUIT CURRENT ： ICC [μA] 8 800 OUTPUT VOLTAGE： VOUT [V] 【BD4729G】 9 CIRCUIT CURRENT WHEN ON ： ICC1[mA] 10 "LOW" OUTPUT CURRENT ： IOL [mA] Reference Data (Unless specified otherwise, Ta=25°C) 【BD4729G】 400 300 Ta=-20℃ 200 100 Ta=75℃ Ta=25℃ 0 0 1 2 3 4 5 TEMPERATURE ： Ta[℃] TEMPERATURE ： Ta[℃] "LOW" OUTPUT CURRENT ： IOL[mA] Fig.8 Circuit Current when OFF Fig.9 Operating Limit Voltage Fig.10 Output Saturation Voltage www.rohm.com © 2010 ROHM Co., Ltd. All rights reserved. 3/7 2010.04 - Rev.C 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. When the input is lowered from that state, the output switches to “Low” on the detection voltage. When the input is less than the detection voltage, the output is in a “Low” state. When the input is raised from that state, the output switches to “High” with the release voltage. Additionally, at least 0.85V is required for the circuit to operate fully. When the input falls below the operating limit voltage, the output becomes unsettled. VDD VDD VS+ΔVS VS ⑤ VOPL 0V VOUT VOH TPHL TPLH TPLH TPHL VOL ① ② ③ ④ Fig.11 Timing Waveform 1 When the power supply is turned on, the output is unsettled from after over the operating limit voltage (VOPL) until TPHL. Therefore it is possible that the reset signal is not outputted when the rise time of Vcc is faster than TPHL. 2 When Vcc is greater than VOPL but less than the reset release voltage (VS + ΔVS), the output voltages will switch to Low. 3 If Vcc exceeds the reset release voltage (VS + ΔVS), then VOUT switches from L to H. 4 If Vcc drops below the detection voltage (VS) when the power supply is powered down or when there is a power supply fluctuation, VOUT switches to L (with a delay of TPHL). 5 The potential difference between the detection voltage and the release voltage is known as the hysteresis width (ΔVS). The system is designed such that the output does not flip-flop with power supply fluctuations within this hysteresis width, preventing malfunctions due to noise. <Precautions> Please be aware that when there is resistance on the power supply line, the detection voltage varies with voltage drops caused by the IC current consumption. Please connect a capacitor between VCC and GND when the power supply line has high impedance. www.rohm.com © 2010 ROHM Co., Ltd. All rights reserved. 4/7 2010.04 - Rev.C 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. When a capacitor has been inserted into the output terminal to delay the output time or to remove noise, the output will be slower during starting or stopping. Please be careful to select the appropriate pull up resistors, output current and capacitor when inserting a bypass capacitor between input and GND. Please be aware that if an extremely large capacitor is used, the response time will become excessively slow. ●●●●●●●●●●●● VCC 5 microcontroller 4 ●●●●●●●●●●● VDD Reset Pin VOUT ●●●●●●●●●●●● Vref 3 BD47□□G GND Fig.12 2) The following shows an example of adding delay time to a reset signal. It is possible to set the delay time using the capacitor CL and the resistor RL connected to the output terminal as shown below. At VCC start up, CL will be charged by RL. The CL and RL time constants and the threshold voltage of the Reset terminal determine the charge delay time. When VCC is decreased, CL is discharged through the Reset IC. The sum of the respective times plus the delay time of the IC itself becomes the reset signal delay time. VCC VDD RL BD47□□G CPU Micro-controller RESET VOUT CL GND VCC GND VCC VS+ΔVS VS 0V VOH RESET (=VOUT) TPLH TPHL TPLH VOL Fig.13 www.rohm.com © 2010 ROHM Co., Ltd. All rights reserved. 5/7 2010.04 - Rev.C 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. Please make sure all pins, which are over ground even if, include transient feature. 3. Electromagnetic Field Mal-function may happen when the device is used in the strong electromagnetic field. 4. Bypass Capacitor for Noise Rejection Please put into the capacitor between VCC pin and GND, to reject noise. If extremely big capacitor is used, transient response might be late. Please confirm sufficiently for the point. 5. Short Circuit between Terminal and Soldering Don’t short-circuit between Output pin and VCC pin, Output pin and GND pin, or VCC pin and GND pin. When soldering the IC on circuit board, please be unusually cautious about the orientation and the position of the IC. When the orientation is mistaken the IC may be destroyed. 6. This IC has extremely high impedance terminals. Small leak current due to the uncleanness of PCB surface might cause unexpected operations. Application values in these conditions should be selected carefully. If the leakage is assumed between the VOUT terminal and the GND terminal, the pull-up resistor should be less than 1/10 of the assumed leak resistance. 7. External parameters The recommended parameter range for RL is 2kΩ~1MΩ. There are many factors (board layout, etc) that can affect characteristics. Please verify and confirm using practical applications. 8. Power on reset operation Please note that the power on reset output varies with the Vcc rise up time. Please verify the actual operation. 9. Precautions for board inspection Connecting low-impedance capacitors to run inspections with the board may produce stress on the IC. Therefore, be certain to use proper discharge procedure before each process of the test operation. To prevent electrostatic accumulation and discharge in the assembly process, thoroughly ground yourself and any equipment that could sustain ESD damage, and continue observing ESD-prevention procedures in all handing, transfer and storage operations. Before attempting to connect components to the test setup, make certain that the power supply is OFF. Likewise, be sure the power supply is OFF before removing any component connected to the test setup. 10. When the power supply, is turned on because of in certain cases, momentary Rash-current flow into the IC at the logic unsettled, the couple capacitance, GND pattern of width and leading line must be considered. www.rohm.com © 2010 ROHM Co., Ltd. All rights reserved. 6/7 2010.04 - Rev.C 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: 1.9V19 Package Embossed Taping SSOP5 5 4 1 2 0.2Min. +0.2 1.6 −0.1 2.8±0.2 <Tape and Reel information> +6° 4° −4° 2.9±0.2 3 Tape Embossed carrier tape Quantity 3000pcs Direction of feed TR The direction is the 1pin of product is at the upper right when you hold ( reel on the left hand and you pull out the tape on the right hand 1pin +0.05 0.13 −0.03 1.25Max. ) 0.05±0.05 1.1±0.05 S +0.05 0.42 −0.04 0.95 0.1 S Direction of feed Reel (Unit : mm) www.rohm.com © 2010 ROHM Co., Ltd. All rights reserved. 7/7 ∗ Order quantity needs to be multiple of the minimum quantity. 2010.04 - Rev.C 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. Examples of application circuits, circuit constants and any other information contained herein illustrate the standard usage and operations of the Products. The peripheral conditions must be taken into account when designing circuits for mass production. Great care was taken in ensuring the accuracy of the information specified in this document. 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