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PDF BU4309 Data sheet ( Hoja de datos )
| Número de pieza | BU4309 | |
| Descripción | (BU42xx / BU43xx) Low Voltage Free Delay Time Setting CMOS Voltage Detector IC | |
| Fabricantes | ROHM Semiconductor | |
| Logotipo |  |
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Datasheet
Voltage Detector IC Series
Low Voltage Free Delay Time Setting
CMOS Voltage Detector IC Series
BU42xx series BU43xx series
●General Description
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.
●Features
Delay Time Controlled by external Capacitor
Two output types (Nch open drain and CMOS output)
Ultra-low current consumption
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)
●Typical Application Circuit
VDD1
VDD2
●Key Specifications
Detection voltage:
0.9V to 4.8V (Typ.)
0.1V steps
High accuracy detection voltage:
Ultra-low current consumption:
Operating temperature range:
±1.0%
0.55µA (Typ.)
-40°C to +125°C
●Package
SSOP5:
2.90mm x 2.80mm x 1.25mm
SOP4:
2.00mm x 2.10mm x 0.95mm
VSOF5:
1.60mm x 1.60mm x 0.60mm
●Applications
Circuits using microcontrollers or logic circuits that require
a reset.
VDD1
RL
BU42xx
RST
Micro
controller
CIN CT
CL
(Capacitor for
noise filtering)
Open Drain Output type
GND
BU42xx series
●Connection Diagram & Pin Descriptions
SSOP5
TOP VIEW
CT
N.C.
SOP4
TOP VIEW
CIN
GND
VOUT CT
43
BU43xx
CT
RST
Micro
controller
CL
(Capacitor for
noise filtering)
CMOS Output type
BU43xx series
VSOF5
TOP VIEW
GND VDD
54
Marking
VOUT
PIN
No.
Symbol
Lot. No
VDD GND
Function
Marking
PIN
No.
Symbol
12
GND VDD
Function
Lot. No
Marking 1 2 3
VOUT SUB CT
Lot. No
PIN
No.
Symbol
Function
1 VOUT Reset output
1 GND GND
1 VOUT Reset output
2 VDD Power supply voltage
2 VDD Power supply voltage
2 SUB Substrate*
3 GND GND
Capacitor connection
3 CT terminal for output
delay time
Capacitor connection
3 CT terminal for output
delay time
4 N.C. Unconnected terminal
4 VOUT Reset output
4 VDD Power supply voltage
Capacitor connection
5 CT terminal for output
delay time
5 GND GND
○Product structure：Silicon monolithic integrated circuit
.www.rohm.com
© 2013 ROHM Co., Ltd. All rights reserved.
TSZ22111・14・001
*Connect the substrate to VDD
○This product is not designed for protection against radioactive rays
1/13
TSZ02201-0R7R0G300050-1-2
2.Aug.2013 Rev.007
Free Datasheet http://www.datasheet4u.com/
1 page  
BU42xx series BU43xx series
Datasheet
●Electrical Characteristics (Unless Otherwise Specified Ta=-25 to 125°C) - continued
Parameter
Symbol
Condition
Leak Current when OFF
CT pin Threshold Voltage
Output Delay Resistance
CT pin Output Current
Detection Voltage
Temperature coefficient
Ileak
VCTH
RCT
ICT
VDD=VDS=7V Ta=-40 to 85°C
VDD=VDS=7V Ta=85 to 125°C
VDD=VDET×1.1, VDET=0.9 to 2.5V Ta=25°C
RL=470kΩ
VDD=VDET×1.1, VDET=2.6 to 4.8V Ta=25°C
RL=470kΩ
VDD=VDET×1.1 VCT=0.5V Ta=25°C *1
VCT=0.1V VDD=0.85V
VCT=0.5V VDD=1.5V VDET=1.7 to 4.8V
VDET/∆T Ta=-40°C to 125°C
Hysteresis Voltage
VDD=LÆHÆL
∆VDET Ta=-40 to 125°C
RL=470kΩ
VDET≤1.0V
VDET≥1.1V
*1: Design Guarantee. (Outgoing inspection is not done on all products.)
VDET(T) : Standard Detection Voltage (0.9V to 4.8V, 0.1V step)
RL: Pull-up resistor to be connected between VOUT and power supply.
Min.
-
-
VDD
×0.35
VDD
×0.40
9
5
200
-
VDET
×0.03
VDET
×0.03
Limit
Typ.
0
0
VDD
×0.45
VDD
×0.50
10
40
400
±30
VDET
×0.05
VDET
×0.05
Max.
0.1
1
VDD
×0.55
VDD
×0.60
11
-
-
Unit
µA
V
MΩ
µA
- ppm/°C
VDET
×0.08
VDET
×0.07
V
www.rohm.com
© 2013 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
5/13
TSZ02201-0R7R0G300050-1-2
2.Aug.2013 Rev.007
Free Datasheet http://www.datasheet4u.com/
5 Page 
BU42xx series BU43xx series
●Circuit Applications
1) Examples of common power supply detection reset circuits
VDD1
CIN CT
VDD1
VDD2
BU42xx
RL
Micro
RST controller
CL
(Capacitor for
noise filtering)
Fig.18 Open Drain Output type
GND
CIN CT
GND
BU43xx
Micro
RST controller
CL
(Capacitor for
noise filtering)
Fig.19 CMOS Output type
Datasheet
Application examples of BU42xx series
(Open Drain output type) and BU43xx series
(CMOS output type) are shown below.
CASE1: Power supply of microcontroller (VDD2) differs
from the power supply of the reset detection (VDD1).
Use an open drain output Type (BU42xx series) device
with a load resistance RL as shown Fig.18.
CASE2: Power supply of microcontroller (VDD1) is the
same as the power supply of the reset detection (VDD1).
Use a CMOS output type (BU43xx series) device or an
open drain output type (BU42xx series) device with a pull
up resistor between the output and VDD1.
When a capacitance CL for noise filtering is connected to
VouT pin (the reset signal input terminal of the
microcontroller), please take into account the waveform
of the rise and fall time of the output voltage (VouT).
2) The following is an example of a circuit application in which an OR connection between two types of detection voltage
resets the microcontroller.
VDD1
VDD2
VDD3
BU42xx
NO.1
CT
BU42xx
NO.2
CT
RL
RST
microcontroller
Fig.20
GND
To reset the microcontroller when many independent power supplies are used in the system, OR connect an open drain
output type (BU42xx series) to the microcontroller’s input with pull-up resistor to the supply voltage of the microcontroller
(VDD3) as shown in Fig. 20. By pulling-up to VDD3, output “High” voltage of micro-controller power supply is possible.
www.rohm.com
© 2013 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
11/13
TSZ02201-0R7R0G300050-1-2
2.Aug.2013 Rev.007
Free Datasheet http://www.datasheet4u.com/
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet BU4309.PDF ] | |
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