ROHM BD45231G Technical data
Datasheet
Voltage Detector IC Series
Counter Timer Built-in
CMOS Voltage Detector IC
BD45xxx series BD46xxx series
●General Description
ROHM’s BD45xxx and BD46xxx 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
Counter Timer Built-in
None delay time setting capacitor
Ultra-low current consumption
Tow output types (Nch open drain and CMOS output)
●Ty pical A pplication Circuit
VDD1 VDD2
BD45xxx
（Open Drain Output Type）
●Connection Diagram
SSOP5
Marking
ER SUB GND
○Product structure：Silicon monolithic integrated circuit ○This product is not designed protection against radioactive rays.
R
L
RST
CL
（Noise-filtering
Capacitor）
BD45xxx series
OUT VDD
V
TOP VIEW
Lot. No
Micro
controller
GND
●Key Specifications
Detection voltage: 2.3V to 4.8V (Typ.)
High accuracy detection voltage: ±1.0%
Ultra-low current consumption: 0.85µA (Typ.)
Operating temperature range: -40°C to +105°C
Three internal, fixed delay time: 50ms
100ms
200ms
●Package
SSOP5 2.90mm x 2.80mm x 1.15mm
●Applications
All electronic devices that use microcontrollers
and logic circuits
VDD1
GND
BD46xxx
CL
（Noise-filterin g
Capacitor）
RST
（CMOS Output Type）
BD46xxx series
●Pin Descriptions
PIN No. Symbol Function
1 ER Manual Reset
2 SUB Substrate *
3 GND GND
4 VOUT Reset Output
5 VDD Power Supply Voltage
*Connect the substrate to GND.
0.1V steps
Micro
controller
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BD45xxx series BD46xxx series
●Ordering Information
Datasheet
B D 4 5
BD45: Reset Voltage Value
Open Drain Type
CMOS Detector IC with
Built-In Counter Timer
1: 100ms
CMOS Detector IC with
Built-In Counter Timer
2 3 1 G － T R
Counter Timer
23: 2.3V
48: 4.8V 5: 50ms
Delay Time Settings
2: 200ms BD46: CMOS Output Type
Package
G：SSOP5
Packaging and forming specification
TR: Embossed tape and reel
SSOP5
<Tape and Reel information>
Embossed carrier tapeTape
Quantity
Direction
of feed
3000pcs
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
Reel
1pin
Direction of feed
Order quantity needs to be multiple of the minimum quantity.
∗
2.8±0.2
1.25Max.
1.1±0.05
°
+0.05
−0.04
S
+
6
°
4
°
−4
+0.05
0.13
−0.03
(Unit : mm)
0.2Min.
2.9±0.2
5
4
+0.2
−0.1
1.6
12
3
0.95
0.05±0.05
0.42
0.1 S
●Lineup
Detection
Voltage
Mar
king
Part
Number
Mark
ing
Part
Number
Mark
ing
Part
Number
Mark
ing
Part
Number
Mark
ing
Part
Number
Mark
ing
4.8V T0 BD45485 TS BD45481 UJ BD45482 VA BD46485 W2 BD46481 WU BD46482
4.7V T1 BD45475 TT BD45471 UK BD45472 VB BD46475 W3 BD46471 WV BD46472
4.6V T2 BD45465 TU BD45461 UL BD45462 VC BD46465 W4 BD46461 WW BD46462
4.5V T3 BD45455 TV BD45451 UM BD45452 VD BD46455 W5 BD46451 WX BD46452
4.4V T4 BD45445 TW BD45441 UN BD45442 VE BD46445 W6 BD46441 WY BD46442
4.3V T5 BD45435 TX BD45431 UP BD45432 VF BD46435 W7 BD46431 WZ BD46432
4.2V T6 BD45425 TY BD45421 UQ BD45422 VG BD46425 W8 BD46421 X0 BD46422
4.1V T7 BD45415 TZ BD45411 UR BD45412 VH BD46415 W9 BD46411 X1 BD46412
4.0V T8 BD45405 U0 BD45401 US BD45402 VJ BD46405 WA BD46401 X2 BD46402
3.9V T9 BD45395 U1 BD45391 UT BD45392 VK BD46395 WB BD46391 X3 BD46392
3.8V TA BD45385 U2 BD45381 UU BD45382 VL BD46385 WC BD46381 X4 BD46382
3.7V TB BD45375 U3 BD45371 UV BD45372 VM BD46375 WD BD46371 X5 BD46372
3.6V TC BD45365 U4 BD45361 UW BD45362 VN BD46365 WE BD46361 X6 BD46362
3.5V TD BD45355 U5 BD45351 UX BD45352 VP BD46355 WF BD46351 X7 BD46352
3.4V TE BD45345 U6 BD45341 UY BD45342 VQ BD46345 WG BD46341 X8 BD46342
3.3V TF BD45335 U7 BD45331 UZ BD45332 VR BD46335 WH BD46331 X9 BD46332
3.2V TG BD45325 U8 BD45321 V0 BD45322 VS BD46325 WJ BD46321 XA BD46322
3.1V TH BD45315 U9 BD45311 V1 BD45312 VT BD46315 WK BD46311 XB BD46312
3.0V TJ BD45305 UA BD45301 V2 BD45302 VU BD46305 WL BD46301 XC BD46302
2.9V TK BD45295 UB BD45291 V3 BD45292 VV BD46295 WM BD46291 XD BD46292
2.8V TL BD45285 UC BD45281 V4 BD45282 VW BD46285 WN BD46281 XE BD46282
2.7V TM BD45275 UD BD45271 V5 BD45272 VX BD46275 WP BD46271 XF BD46272
2.6V TN BD45265 UE BD45261 V6 BD45262 VY BD46265 WQ BD46261 XG BD46262
2.5V TP BD45255 UF BD45251 V7 BD45252 VZ BD46255 WR BD46251 XH BD46252
2.4V TQ BD45245 UG BD45241 V8 BD45242 W0 BD46245 WS BD46241 XJ BD46242
2.3V TR BD45235 UH BD45231 V9 BD45232 W1 BD46235 WT BD46231 XK BD46232
Part
Number
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z Absolute maximum ratings (Ta=25°C)
Parameter Symbol Limits Unit
Power Supply Voltage VDD-GND -0.3 to +10 V
Output Voltage
Nch Open Drain Output GND-0.3 to +10
CMOS Output
VOUT
GND-0.3 to V
DD
+0.3
V
ER pin Voltage VCT GND-0.3 to VDD+0.3 V
Power Dissipation
*1 *2
Pd 540 mW
Operating Temperature Topr -40 to +105 °C
Ambient Storage Temperature Tstg -55 to +125 °C
*1 Use above Ta=25°C results in a 5.4mW loss per degree.
*2 When mounted on a 70mm×70mm×1.6mm glass epoxy board.
●Electrical characteristics (Unless Otherwise Specified Ta=-40 to 105°C)
Parameter Symbol Condition
Detection Voltage VDET VDD=HÆL, RL=470kΩ
Detection Voltage
Temperature coefficient
Hysteresis Voltage ∆VDET
‘High’ Output
Delay time
Circuit Current
when ON
Circuit Current
when OFF
Operating Voltage Range VOPL
‘High’ Output Current
‘Low’Output Current (Nch)
Leak Current when OFF I
V
DET/
∆T
tPLH
I
DD1
I
DD2
I
I
-40°C to +105°C
VDD＝LÆHÆL, RL=470kΩ
CL=100pF,
RL=100kΩ
VDD=VDET-0.2V, VER=0V VDET=2.3V to 3.1V *1 - 0.70 2.10
VDD=VDET-0.2V, VER=0V VDET=2.3V to 3.1V
VDD=VDET-0.2V, VER=0V VDET=3.2V to 4.2V *1 - 0.75 2.25
VDD=VDET-0.2V, VER=0V VDET=3.2V to 4.2V
VDD=VDET-0.2V, VER=0V VDET=4.3V to 4.8V *1 - 0.80 2.40
VDD=VDET-0.2V, VER=0V VDET=4.3V to 4.8V
VDD=VDET+0.2V, VER=0V VDET=2.3V to 3.1V
VDD=VDET+0.2V, VER=0V VDET=2.3V to 3.1V
VDD=VDET+0.2V, VER=0V VDET=3.2V to 4.2V
VDD=VDET+0.2V, VER=0V VDET=3.2V to 4.2V
VDD=VDET+0.2V, VER=0V VDET=4.3V to 4.8V
VDD=VDET+0.2V, VER=0V VDET=4.3V to 4.8V
VOL≤0.4V, RL=470kΩ, Ta=25 to 105°C
VOL≤0.4V, RL=470kΩ, Ta=-40 to 25°C
OH
VDS=0.5V,VDD=6.0V,VDET≥4.3V
VDS=0.5V, VDD=1.2V
OL
VDS=0.5V, VDD=2.4V VDET=2.7V to 4.8V
VDD=VDS=10V
leak
*1, *2, *3
BD45XX5, BD46XX5
BD45XX1, BD46XX1
BD45XX2, BD46XX2
ER Pin ‘H’ Voltage VEH
ER Pin ‘L’ Voltage VEL
ER Pin Input Current IEL
VDET(T):Standard Detection Voltage (2.3V to 4.8V, 0.1V step)
R
L :Pull-up resistor to be connected between VOUT and power supply.
C
L :Capacitor to be connected between VOUT and GND.
*1 Guarantee is Ta=25°C.
*2
tPLH:VDD=(VDET(T)-0.5V)Æ(VDET(T)+0.5V)
*3
tPLH:VDD=Please set up the rise up time between VDD=0ÆVDET more than 100µs.
Attention: Please connect the GND when you don’t use ‘ER’
Min. Typ. Max.
VDET(T)
*1
×0.99
- ±100 ±360 ppm/°C
VDET(T)
×0.03
45 50 55
90 100 110
180 200 220
- 0.70 2.85
- 0.75 3.00
*1
*1
*1
- 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 - mA
0.4 1.2 -
*1
2.0 5.0 -
- - 0.1 µA
*1
2.0 - - V
*1
- - 0.8 V
- 1 10 µA
Limit
V
DET(T)
DET(T)
V
×0.05
V
DET(T)
×1.01
DET(T)
V
×0.08
Datasheet
Unit
V
V
ms
µA
µA
V
mA
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BD45xxx series BD46xxx series
R
R
●Block Diagrams
Vref
GND
Fig.1 BD45xxx Series
VDD
Vref
VDD
Oscillation
Circuit Counter
Timer
E
Oscillation
Circuit Counter
Timer
Datasheet
VOUT
VOUT
GND
Fig.2 BD46xxx Series
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TSZ02201-0R7R0G300010-1-2
19.DEC.2011 Rev.002
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