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Voltage Detector IC Series
Counter Timer Built-in CMOS Voltage Detector IC
BD45G, BD46G series
No.09006ECT06
Description ROHM's BD45G and BD46G series are highly accurate, low current consumption reset IC series. Because the counter timer delay circuit is built into those series, an external capacitor for the delay time setting is unnecessary. The lineup was established with tow output types (Nch open drain and CMOS output) and detection voltages range from 2.3V to 4.8V in increments of 0.1V, so that the series may be selected according the application at hand. Features 1) Detection voltage: 2.3V to 4.8V (Typ.), 0.1V steps 2) High accuracy detection voltage:1.0% 3) Ultra-low current consumption: 0.85A (Typ.) 4) Operating temperature range: -40C to +105C 6) SSOP5 compact surface mount packages 5) Three internal, fixed delay time: 50ms, 100ms and 200ms 7) Nch open drain output (BD45G), CMOS output (BD46G) Applications All electronic devices that use microcontrollers and logic circuits Selection Guide No.
1
Specifications Output Circuit Format Detection Voltage Fixed Delay Times
Description 5:Open Drain Output, 6:CMOS Output
Example: Displays VDET over a 2.3V to 4.8V range in 0.1V increments. (2.9V is marked as "29")
Part Number : BD4
1 2 3
G
2
3
5: 50ms(Typ.), 1: 100ms(Typ.) 2: 200ms(Typ.)
Part Number BD46485 BD46475 BD46465 BD46455 BD46445 BD46435 BD46425 BD46415 BD46405 BD46395 BD46385 BD46375 BD46365 BD46355 BD46345 BD46335 BD46325 BD46315 BD46305 BD46295 BD46285 BD46275 BD46265 BD46255 BD46245 BD46235 Part Number BD46481 BD46471 BD46461 BD46451 BD46441 BD46431 BD46421 BD46411 BD46401 BD46391 BD46381 BD46371 BD46361 BD46351 BD46341 BD46331 BD46321 BD46311 BD46301 BD46291 BD46281 BD46271 BD46261 BD46251 BD46241 BD46231 Part Number BD46482 BD46472 BD46462 BD46452 BD46442 BD46432 BD46422 BD46412 BD46402 BD46392 BD46382 BD46372 BD46362 BD46352 BD46342 BD46332 BD46322 BD46312 BD46302 BD46292 BD46282 BD46272 BD46262 BD46252 BD46242 BD46232
Lineup
Detection Voltage 4.8V 4.7V 4.6V 4.5V 4.4V 4.3V 4.2V 4.1V 4.0V 3.9V 3.8V 3.7V 3.6V 3.5V 3.4V 3.3V 3.2V 3.1V 3.0V 2.9V 2.8V 2.7V 2.6V 2.5V 2.4V 2.3V Marking T0 T1 T2 T3 T4 T5 T6 T7 T8 T9 TA TB TC TD TE TF TG TH TJ TK TL TM TN TP TQ TR Part Number BD45485 BD45475 BD45465 BD45455 BD45445 BD45435 BD45425 BD45415 BD45405 BD45395 BD45385 BD45375 BD45365 BD45355 BD45345 BD45335 BD45325 BD45315 BD45305 BD45295 BD45285 BD45275 BD45265 BD45255 BD45245 BD45235 Marking TS TT TU TV TW TX TY TZ U0 U1 U2 U3 U4 U5 U6 U7 U8 U9 UA UB UC UD UE UF UG UH Part Number BD45481 BD45471 BD45461 BD45451 BD45441 BD45431 BD45421 BD45411 BD45401 BD45391 BD45381 BD45371 BD45361 BD45351 BD45341 BD45331 BD45321 BD45311 BD45301 BD45291 BD45281 BD45271 BD45261 BD45251 BD45241 BD45231 Marking UJ UK UL UM UN UP UQ UR US UT UU UV UW UX UY UZ V0 V1 V2 V3 V4 V5 V6 V7 V8 V9 Part Number BD45482 BD45472 BD45462 BD45452 BD45442 BD45432 BD45422 BD45412 BD45402 BD45392 BD45382 BD45372 BD45362 BD45352 BD45342 BD45332 BD45322 BD45312 BD45302 BD45292 BD45282 BD45272 BD45262 BD45252 BD45242 BD45232 Marking VA VB VC VD VE VF VG VH VJ VK VL VM VN VP VQ VR VS VT VU VV VW VX VY VZ W0 W1 Marking W2 W3 W4 W5 W6 W7 W8 W9 WA WB WC WD WE WF WG WH WJ WK WL WM WN WP WQ WR WS WT Marking WU WV WW WX WY WZ X0 X1 X2 X3 X4 X5 X6 X7 X8 X9 XA XB XC XD XE XF XG XH XJ XK
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1/9
2009.05 - Rev.C
BD45G, BD46G series
Absolute maximum ratings (Ta=25C) Parameter Power Supply Voltage Nch Open Drain Output Output Voltage CMOS Output ER pin Voltage *1 *2 Power Dissipation Operating Temperature Ambient Storage Temperature
Technical Note
Symbol VDD-GND VOUT VCT Pd Topr Tstg
Limits -0.3 ~ +10 GND-0.3 ~ +10 GND-0.3 ~ VDD+0.3 GND-0.3 ~ VDD+0.3 540 -40 ~ +105 -55 ~ +125
Unit V V V mW C C
*1 Use above Ta=25C results in a 5.4mW loss per degree. *2 When mounted on a 70mmx70mmx1.6mm glass epoxy board.
Electrical characteristics (Unless Otherwise Specified Ta=-40 to 105C) Parameter Detection Voltage Detection Voltage Temperature coefficient Hysteresis Voltage `High' Output Delay time Symbol VDET VDET/ T VDET tPLH Condition
VDD=HL, RL=470k -40C~+105C VDDLHL, RL=470k CL=100pF, RL=100k
*1, *2, *3 *1
Limit Min. Typ. Max. VDET(T) VDET(T) VDET(T) x0.99 x1.01 100 360
Unit V ppm/C V ms
BD4XXX5G BD4XXX1G BD4XXX2G
*1
VDD=VDET-0.2V, VER=0V VDET=2.3V~3.1V VDD=VDET-0.2V, VER=0V VDET=2.3V~3.1V
Circuit Current when ON
IDD1
VDD=VDET-0.2V, VER=0V VDET=3.2V~4.2V VDD=VDET-0.2V, VER=0V VDET=3.2V~4.2V VDD=VDET-0.2V, VER=0V VDET=4.3V~4.8V VDD=VDET-0.2V, VER=0V VDET=4.3V~4.8V VDD=VDET+0.2V, VER=0V VDET=2.3V~3.1V VDD=VDET+0.2V, VER=0V VDET=2.3V~3.1V
*1
*1
*1
Circuit Current when OFF
IDD2
VDD=VDET+0.2V, VER=0V VDET=3.2V~4.2V VDD=VDET+0.2V, VER=0V VDET=3.2V~4.2V VDD=VDET+0.2V, VER=0V VDET=4.3V~4.8V VDD=VDET+0.2V, VER=0V VDET=4.3V~4.8V VOL0.4V, RL=470k, Ta=25~105C VOL0.4V, RL=470k, Ta=-40~25C VDS=0.5V,VDD=6.0V,VDET4.3V VDS=0.5V, VDD=1.2V VDS=0.5V, VDD=2.4V VDET=2.7V~4.8V VDD=VDS=10V
*1
*1
Operating Voltage Range `High' Output Current `Low'Output Current (Nch) Leak Current when OFF ER Pin `H' Voltage ER Pin `L' Voltage ER Pin Input Current
VOPL IOH IOL Ileak VEH VEL IEL
*1 *1 *1
VDET(T) VDET(T) VDET(T) x0.03 x0.05 x0.08 45 50 55 90 100 110 180 200 220 0.70 2.10 0.70 2.85 0.75 2.25 0.75 3.00 0.80 2.40 0.80 3.15 0.75 2.25 0.75 4.28 0.80 2.40 0.80 4.50 0.85 2.55 0.85 4.73 0.95 1.20 1.2 2.7 0.4 1.2 2.0 5.0 0.1 2.0 0.8 1 10
A
A
V mA mA A V V A
VDET(T):Standard Detection Voltage (2.3V to 4.8V, 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 Guarantee is Ta=25C. *2 tPLH:VDD=(VDET(T)-0.5V)(VDET(T)+0.5V) *3 tPLH:VDD=Please set up the rise up time between VDD=0VDET more than 100s. Attention: Please connect the GND when you don't use `ER'
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2/9
2009.05 - Rev.C
BD45G, BD46G series
Block Diagrams
Technical Note
BD45G
VDD
BD46G
VDD
Oscillation Circuit Counter Timer
VOUT
Oscillation Circuit Counter Timer
Vref
Vref
VOUT
GND
ER
GND
ER
Fig.1
PIN No.
TOP VIEW
Fig.2
Symbol ER SUB GND VOUT VDD Function Manual Reset Substrate * GND Reset Output Power Supply Voltage
1 2 3 4 5
SSOP5
*Connect the substrate to GND.
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2009.05 - Rev.C
BD45G, BD46G series
Reference Data (Unless specified otherwise, Ta=25C)
Technical Note
"HIGH" OUTPUT CURRENT IOH [mA]
"LOW" OUTPUT CURRENT IOL [mA]
2.0 CIRCUIT CURRENT IDD [A] BD45281G 1.5
20 BD45281G 15 VDD=2.4V 10
20 BD46281G 15 VDD=6.0V
1.0
10
VDD=4.8V
0.5
5 VDD=1.2V 0 0.0
5
0.0 0 1 2 3 4 5 6 7 8 9 10 VDD SUPPLY VOLTAGE VDD[V]
0 0 1 2 3 4 5 6 DRAIN-SOURCE VOLTAGE VDS[V]
0.5
1.0
1.5
2.0
2.5
DRAIN-SOURCE VOLTAGE VDS[V]
Fig.3 Circuit Current
7 OUTPUT VOLTAGE VOUT [V] 6 5 4 3 2 1 0
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 5.5
Fig.4 "Low" Output Current
20 OUTPUT VOLTAGE VOUT [V] ER BIAS CURRENT IER[A]
Fig.5 "High" Output Current
20
BD45421G
BD46281G 15
BD45421G 15
10
10
Ta=25
5
5
Ta=25
0 0 1 2 3 4 5 6 7 8 9 10 VDD SUPPLY VOLTAGE VDD[V]
0 0 1 2 3 4 5 6 7 8 9 10 ER VOLTAGE VER[V] ER VOLTAGE VER[V]
Fig.6 I/O Characteristics
Fig.7 ER Terminal Threshold Voltage
Fig.8 ER Terminal Input Current
IDD1 [A]
5.8 DETECTION VOLTAGE VDET[V] 5.4 5.0 4.6 4.2 3.8 3.4 3.0 -40 High to low(VDET) BD45421G
1.6
CIRCUIT CURRENT WHEN OFF I DD2 [A]
1.4 1.2 1.0 0.8 0.6 0.4 0.2 0.0 -40
BD45421G
Low to high(VDET+VDET)
0
40
80
-20
0
20
40
60
80
100
3.0 2.8 2.6 2.4 2.2 2.0 1.8 1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0.0 -40 -20
BD45421G
CIRCUIT CURRENT WHEN ON
0
20
40
60
80
100
TEMPERATURE Ta[]
TEMPERATURE Ta[]
TEMPERATURE Ta[]
Fig.9 Detection Voltage Release Voltage
Fig.10 Circuit Current when ON (VDET-0.2V)
Fig.11 Circuit Current when OFF
1.5
MINIMUM OPERATION VOLTAGE VOPL[A]
250 "HIGH" DELAY TIME : PLH [ms] "HIGH" DELAY TIME ttPLH [msec]
50
"LOW" DELAY TIME t: tPLH [s] "LOW" DELAY TIME PHL [sec]
BD45421G
BD4528G 200 150 BD45281G 100 50 BD45285G 0 BD45282G
BD45281G tPHL 40 30 20 10 0
1.0
0.5
0.0 -40
-20
0
20
40
60
80
100
-60 -40 -20
0
20
40
60
80 100 120
-60 -40 -20
0
20
40
60
80 100 120
TEMPERATURE Ta[]
TEMPERATURE Ta[]
TEMPERATURE Ta[]
Fig.12 Operating Limit Voltage
Fig.13 Output Delay Time "Low""High"
Fig.14 Output Delay Time "High""Low"
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4/9
2009.05 - Rev.C
BD45G, BD46G series
Technical Note
Reference Data Examples of Leading (TPLH) and Falling (TPHL) Output Part Number tPLH[ms] tPHL[s] BD45275G 50 18 BD46275G 50 18 VDD=2.2V3.2V VDD=3.2V2.2V *This data is for reference only. The figures will vary with the application, so please confirm actual operating conditions before use. Explanation of Operation For both the open drain type (Fig.15) and the CMOS output type (Fig.16), the detection and release voltages are used as threshold voltages. When the voltage applied to the VDD pins reaches the applicable threshold voltage, the VOUT terminal voltage switches from either "High" to "Low" or from "Low" to "High". Because the BD45G series uses an open drain output type, it is possible to connect a pull-up resistor to VDD or another power supply [The output "High" voltage (VOUT) in this case becomes VDD or the voltage of the other power supply].
VDD VDD VDD R1 Vref Reset
Oscillation
R1 Vref VOUT R2 Q1 Q2
Oscillation Circuit Counter Timer
R2
Circuit Counter Timer
Reset VOUT
R3
R3
Q1
GND ER
GND ER
Fig.15 (BD45G Type Internal Block Diagram)
Fig.16 (BD46G Type Internal Block Diagram)
Timing Waveform Example: the following shows the relationship between the input voltages VDD, the output voltage VOUT and ER terminal when the input power supply voltage VDD is made to sweep up and sweep down (the circuits are those in Fig. 12 and 13).
1
VDD VDET+VDET VDET 0V VOH tPLH VOUT VOL tPHL tPLH tPHL tPLH VOPL
VDD
VEH ER tPHL
Fig.17
When the power supply is turned on, the output is unsettled from after over the operating limit voltage (VOPL) until TPHL. There fore it is possible that the reset signal is not outputted when the rise time of VDD is faster than TPHL. 2 When VDD is greater than VOPL but less than the reset release voltage (VDET + VDET), the output voltages will switch to Low. 3 If VDD exceeds the reset release voltage (VDET + VDET), the counter timer start and VOUT switches from L to H. 4 When more than the high level voltage is supplied ER terminal, VOUT comes to "L" after tPLH delay time. Therefore, a time when ER terminal is "H" is necessary for 100sec or more. 5 When the ER terminal switches to Low, the counter timer starts to operate, a delay of tPLH occurs, and VOUT switches from "L" to "H". 6 If VDD drops below the detection voltage (VDET) when the power supply is powered down or when there is a power supply fluctuation, VOUT switches to L (with a delay of tPHL). 7 The potential difference between the detection voltage and the release voltage is known as the hysteresis width (VDET). 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. These time changes by the application and use it, please verify and confirm using practical applications.
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5/9
2009.05 - Rev.C
BD45G, BD46G series
Circuit Applications 1) Examples of a common power supply detection reset circuit.
Technical Note
VDD1 RL BD45
Microcontroller
VDD2
Application examples of BD45G series (Open Drain output type) and BD46G series (CMOS output type) are shown below. CASE1: the power supply of the microcontroller (VDD2) differs from the power supply of the reset detection (VDD1). Use the open drain output type (BD45G) attached a load resistance (RL) between the output and VDD2. (As shown Fig.18) CASE2: the power supply of the microcontroller (VDD1) is same as the power supply of the reset detection (VDD1). Use CMOS output type (BD46G) or open drain output type (BD45G) attached a load resistance (RL) between the output and Vdd1. (As shown Fig.19)
CL
Noise-filtering Capacitor
GND
Fig.18 Open Collector Output Type
VDD1
BD46
Microcontroller
CL
Noise-filtering Capacitor
When a capacitance CL for noise filtering is connected to the VOUT pin (the reset signal input terminal of the microcontroller), please take into account the waveform of the rise and fall of the output voltage (VOUT).
GND
Fig.19 CMOS Output Type
2) The following is an example of a circuit application in which an OR connection between two types of detection voltages resets the microcontroller.
VDD1
VDD2
VDD3
RL ER VOUT ER VOUT
microcontroller
BD45 No.1
BD45 No.2
RST
GND
Fig.20
When there are many power supplies of the system, power supplies VDD1 and VDD2 are being monitored separately, and it is necessary to reset the microcomputer, it is possible to use an OR connection on the open drain output type BD45G series to pull-up to the desired voltage (VDD3) as shown in Fig. 20 and make the output "High" voltage matches the power supply voltage VDD3 of the microcontroller.
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6/9
2009.05 - Rev.C
BD45G, BD46G series
Technical Note
Examples of the power supply with resistor dividers In applications where the power supply input terminal (VDD) of an IC with resistor dividers, it is possible that a through current will momentarily flow into the circuit when the output logic switches, resulting in malfunctions (such as output oscillatory state). (Through-current is a current that momentarily flows from the power supply (VDD) to ground (GND) when the output level switches from "High" to "Low" or vice versa.)
V1
R2 I1 VDD
R1
CIN
ER
BD45G BD46G CL GND
VOUT
Fig.21
A voltage drop of [the through-current (I1)] x [input resistor (R2)] is caused by the through current, and the input voltage to descends, when the output switches from "Low" to "High". When the input voltage decreases and falls below the detection voltage, the output voltage switches from "High" to "Low". At this time, the through-current stops flowing through output "Low", and the voltage drop is eliminated. As a result, the output switches from "Low" to "High", which again causes the through current to flow and the voltage drop. This process is repeated, resulting in oscillation. IDD
Through Current
VDD 0 VDET
Fig.22 Current Consumption vs. Power Supply Voltage
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7/9
2009.05 - Rev.C
BD45G, BD46G series
Technical Note
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) Electrical Characteristics Be sure to check the electrical characteristics that are one the tentative specification will be changed by temperature, supply voltage, and external circuit. (4) Bypass Capacitor for Noise Rejection Please put into the capacitor of 1F or more between VDD pin and GND, and the capacitor of about 1000pF between VOUT 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 VDD pin, Output pin and GND pin, or VDD 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) Electromagnetic Field Mal-function may happen when the device is used in the strong electromagnetic field. (7) The VDD line inpedance might cause oscillation because of the detection current. (8) A VDD -GND capacitor (as close connection as possible) should be used in high VDD line impedance condition. (9) Lower than the mininum input voltage makes the VOUT high impedance, and it must be VDD in pull up (VDD) condition. (10) 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 of about 1M is assumed between the ER terminal and the GND terminal, 100k connection between the ER terminal and the VDD terminal would be recommended. 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. (11) External parameters The recommended parameter range for RL is 50k~1M. There are many factors (board layout, etc) that can affect characteristics. Please verify and confirm using practical applications. (12) Power on reset operation Please note that the power on reset output varies with the VDD rise up time. Please verify the actual operation. (13) 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. (14) 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.
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8/9
2009.05 - Rev.C
BD45G, BD46G series
Part Number Selection
Technical Note
B
D
4
5
2
3
1
G
T
R
BD45:
Open Drain Type CMOS Detector IC with Built-In Counter Timer
Reset Voltage Value 23: 2.3V 48: 4.8V
Counter Timer Delay Time Settings 5: 50ms 1: 100ms 2: 200ms
Package GSSOP5
Taping Specifications Embossed Taping
BD46:
CMOS Output Type CMOS Detector IC with Built-In Counter Timer
SSOP5
(Unitmm)
+6 4 -4
SSOP5
Tape Embossed carrier tape 3000pcs
TR (The direction is the 1pin of product is at the upper left when you hold reel on the left hand and you pull out the tape on the right hand)
2.90.2
5 4
Quantity Direction of feed
2.80.2
1.6 -0.1
+0.2
1
2
3
0.13
1.25Max.
1.10.05
0.050.05
0.42 +0.05 -0.04 0.95 0.1
0.2Min.
+0.05 -0.03
XXX XXX
XXX XXX
XXX XXX
XXX XXX
XXX XXX
1Pin Reel
Direction of feed
* When you order, please order in times the amount of package quantity.
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2009.05 - 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. However, should you incur any damage arising from any inaccuracy or misprint of such information, ROHM shall bear no responsibility for such damage. The technical information specified herein is intended only to show the typical functions of and examples of application circuits for the Products. ROHM does not grant you, explicitly or implicitly, any license to use or exercise intellectual property or other rights held by ROHM and other parties. ROHM shall bear no responsibility whatsoever for any dispute arising from the use of such technical information. The Products specified in this document are intended to be used with general-use electronic equipment or devices (such as audio visual equipment, office-automation equipment, communication devices, electronic appliances and amusement devices). The Products specified in this document are not designed to be radiation tolerant. While ROHM always makes efforts to enhance the quality and reliability of its Products, a Product may fail or malfunction for a variety of reasons. Please be sure to implement in your equipment using the Products safety measures to guard against the possibility of physical injury, fire or any other damage caused in the event of the failure of any Product, such as derating, redundancy, fire control and fail-safe designs. ROHM shall bear no responsibility whatsoever for your use of any Product outside of the prescribed scope or not in accordance with the instruction manual. The Products are not designed or manufactured to be used with any equipment, device or system which requires an extremely high level of reliability the failure or malfunction of which may result in a direct threat to human life or create a risk of human injury (such as a medical instrument, transportation equipment, aerospace machinery, nuclear-reactor controller, fuel-controller or other safety device). ROHM shall bear no responsibility in any way for use of any of the Products for the above special purposes. If a Product is intended to be used for any such special purpose, please contact a ROHM sales representative before purchasing. If you intend to export or ship overseas any Product or technology specified herein that may be controlled under the Foreign Exchange and the Foreign Trade Law, you will be required to obtain a license or permit under the Law.
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