Datasheet
Voltage Detector IC Series
Low Voltage Free Delay Time Setting
CMOS Voltage Detector IC Series
BU42xx series BU43xx series
●General Description
●Key Specifications
ꢀ Detection voltage:
ROHM’s BU42xx and BU43xx series are CMOS Voltage
Detector ICs with adjustable output delay. It is a
high-accuracy, low current consumption Voltage Detector
IC series with a built-in delay circuit. The lineup was
established with two output types (Nch open drain and
CMOS output) and detection voltages range from 0.9V to
4.8V in increments of 0.1V, so that the series may be
selected according to application.
0.9V to 4.8V (Typ.)
0.1V steps
ꢀ High accuracy detection voltage:
ꢀ Ultra-low current consumption:
ꢀ Operating temperature range:
●Package
±1.0%
0.55µA (Typ.)
-40°C to +125°C
SSOP5:
2.90mm x 2.80mm x 1.25mm
2.00mm x 2.10mm x 0.95mm
1.60mm x 1.60mm x 0.60mm
●Features
ꢀ Delay Time Controlled by external Capacitor
ꢀ Two output types (Nch open drain and CMOS output)
ꢀ Ultra-low current consumption
SOP4:
VSOF5:
ꢀ Wide operating temperature range
ꢀ Very small and low height package
ꢀ Package SSOP5 and SOP4 is similar to SOT-23-5
and SC-82 respectively (JEDEC)
●Applications
Circuits using microcontrollers or logic circuits that require
a reset.
●Typical Application Circuit
VDD1
VDD1
VDD2
RL
Micro
controller
RST
BU43xx
Micro
controller
RST
BU42xx
CIN
CT
CT
CIN
CL
CL
(Capacitor for
noise filtering)
(Capacitor for
noise filtering)
GND
GND
Open Drain Output type
BU42xx series
CMOS Output type
BU43xx series
●Connection Diagram & Pin Descriptions
SSOP5
TOP VIEW
SOP4
TOP VIEW
VSOF5
TOP VIEW
VOUT
CT
3
N.C.
CT
GND VDD
4
5
4
Lot. No
Lot. No
Marking
Marking
2 3
1
Lot. No
Marking
VOUT SUB CT
1
2
GND
VDD
VOUT VDD GND
PIN
No.
PIN
No.
PIN
No.
Symbol
Function
Symbol
Function
Symbol
VOUT Reset output
SUB Substrate*
Capacitor connection
Function
1
2
VOUT Reset output
1
2
GND GND
1
2
VDD Power supply voltage
GND GND
VDD
Power supply voltage
Capacitor connection
terminal for output
delay time
3
4
5
3
4
CT
3
4
5
CT
terminal for output
delay time
N.C. Unconnected terminal
Capacitor connection
CT
VOUT Reset output
VDD Power supply voltage
GND GND
terminal for output
delay time
*Connect the substrate to VDD
○Product structure:Silicon monolithic integrated circuit ○This product is not designed for protection against radioactive rays
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TSZ02201-0R7R0G300050-1-2
03.Feb.2014 Rev.008
© 2014 ROHM Co., Ltd. All rights reserved.
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