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Datasheet
Voltage Detector IC Series
Standard CMOS
Voltage Detector IC
BD48xxx series BD49xxx series
●General Description
ROHM’s BD4 8xxx and B D49xxx seri es are hig hly
accurate, lo w current cons umption reset IC series. T he
line u p incl udes BD48 xxx de vices with N chan nel o pen
drain output a nd BD4 9xxx d evices with C MOS output.
The devices are available for specific detecti on voltages
ranging from 2.3V to 6.0V in increments of 0.1V.
●Features
High accuracy detection
Ultra-low current consumption
Two output types (Nch open drain and CMOS output)
Wide Operating temperature range
Very small and low height package
Package SSOP5 is similar to SOT-23-5 (JEDEC)
Package SSOP3 is similar to SOT-23-3 (JEDEC)
●Key Specifications
Detectio n voltage:
2.3V
High accuracy detection voltage:
Ultra-low current consumption:
to 6.0V (Typ.),
0.1V steps
± 1.0%
0 .9μA (Typ.)
Operating temperature range: -40°C to +105°C
●Package
SSOP5:
SSOP3:
VSOF5:
2.90mm x 2.80mm x 1.15mm
2.90mm x 2.80mm x 1.15mm
1.60 mm x 1.60mm x 0.60mm
●Applications
Circuits usin g microcontroll ers or logic circuit
require a reset.
s that
●Typical Application Circuit
VDD1
BD48xxx
VDD2
RL
RST
Micro
controller
VDD1
CL
( Capacitor for
noise filtering)
(Open Drain Output type)
BD48xxx series
GND
GND
BD49xxx
RST
Micro
controller
CL
( Capacitor for
noise filtering)
(CMOS Output type)
BD49xxx series
○Product structure:Silicon monolithic integrated circuit ○This product is not designed protection against radioactive rays.
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BD48xxx series BD49xxx series
Datasheet
●Application Information
Explanation of Operation
For bot h t he open dra in t ype (F ig.12) and t he CMOS out put t ype (F ig.13), t he det ection and releas e voltages ar e used as
threshold volt ages. When t he volt age ap plied t o t he V DD pins reach es t he appl icable t hreshold volt age, t he V OUT t erminal
voltage s witches f rom eit her “High” t o “Lo w” or f rom “L ow” t o “Hi gh”. Please ref er t o t he T iming W aveform a nd E lectrical
Characteristics for information on hysteresis.
Because t he B D48xxx ser ies uses a n op en drain output t ype, it is poss ible t o co nnect a pul l-up r esistor t o V DD or another
power supply [The output “High” voltage (VOUT) in this case becomes VDD or the voltage of the other power supply].
VDD
R1
Vref
R2
RL
VOUT
Q1
R3
GND
Fig.12 (BD48xxx series Internal Block Diagram)
R1
Vref
VDD
Q2
VOUT
R2
Q1
R3
GND
Fig.13 (BD49xxx series Internal Block Diagram)
Reference Data
Examples of Leading (tPLH) and Falling (tPHL) Output
Part Number
tPLH (μs) t
PHL (μs)
BD48x45
39.5
87.8
BD49x45
32.4
52.4
*This data is for reference only.
VDD=4.3VÆ5.1V
VDD=5.1VÆ4.3V
The figures will vary with the application, so please confirm actual operating conditions before use.
Timing Waveform
Example: the following shows the relationship between the input voltages VDD and t he output voltage VOUT when the
input power supply voltage VDD is made to sweep up and sweep down (the circuits are those in Fig.12 and 13).
VDD
VDET+ΔVDET
VDET
VOPL
0V
VOUT
VOH
tPHL
VOL
⑤
tPLH
tPHL
tPLH
①②③ ④
Fig.14 Timing Waveform
1 When the power supply is turned on, the output is unsettled from
after over the oper ating limit voltage (VOPL) unt il t PHL. Therefore it is
possible that the reset signal is not valid 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 exce eds t he reset releas e volt age (V DET + ∆VDET), t hen
VOUT switches from L to H.
4 If VDD drops below t he d etection voltage ( VDET) when t he po wer
supply is powered down or when there is a power supply fluctuation,
VOUT switches to L (with a delay of tPHL).
5 The pot ential dif ference b etween t he d etection volt age and t he
release volt age is kno wn a s t he h ysteresis width ( ∆VDET). T he
system is designed such that the output does not flip-flop with power
supply fluctuations within this hysteresis width, preventing
malfunctions due to noise.
www.rohm.com © 2012 ROHM Co., Ltd. All rights reserved.
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TSZ02201-0R7R0G300030-1-2
08.JUL.2012.Rev.006