LOW VOLTAGE DETECTOR
R
×
5VT SERIES
APPLICATION MANUAL
ELECTRONIC DEVICES DIVISION
NO.EA-026-9803
NOTICE
1. The products and the product specifications described in this application manual are subject to change or dis-
continuation of production without notice for reasons such as improvement. Therefore, before deciding to use
the products, please refer to Ricoh sales representatives for the latest information thereon.
2. This application manual may not be copied or otherwise reproduced in whole or in part without prior written con-
sent of Ricoh.
3. Please be sure to take any necessary formalities under relevant laws or regulations before exporting or other-
wise taking out of your country the products or the technical information described herein.
4. The technical information described in this application manual shows typical characteristics of and example
application circuits for the products. The release of such information is not to be construed as a warranty of or a
grant of license under Ricoh's or any third party's intellectual property rights or any other rights.
5. The products listed in this document are intended and designed for use as general electronic components in
standard applications (office equipment, computer equipment, measuring instruments, consumer electronic
products, amusement equipment etc.). Those customers intending to use a product in an application requiring
extreme quality and reliability, for example, in a highly specific application where the failure or misoperation of
the product could result in human injury or death (aircraft, spacevehicle, nuclear reactor control system, traffic
control system, automotive and transportation equipment, combustion equipment, safety devices, life support
system etc.) should first contact us.
6. We are making our continuous effort to improve the quality and reliability of our products, but semiconductor
products are likely to fail with certain probability. In order prevent any injury to persons or damages to property
resulting from such failure, customers should be careful enough to incorporate safety measures in their design,
such as redundancy feature, fire-containment feature and fail-safe feature. We do not assume any liability or
responsibility for any loss or damage arising from misuse or inappropriate use of the products.
7. Anti-radiation design is not implemented in the products described in this application manual.
8. Please contact Ricoh sales representatives should you have any questions or comments concerning the prod-
ucts or the technical information.
June 1995
R
×
SERIES
5VT
APPLICATION MANUAL
CONTENTS
OUTLINE
......................................................................................................
1
FEATURES
....................................................................................................
1
APPLICATIONS
.............................................................................................
1
BLOCK DIAGRAMS
.......................................................................................
2
TIME CHART
.................................................................................................
2
DEFINITION OF OUTPUT DELAY TIME t
PLH
....................................................
2
SELECTION GUIDE
.......................................................................................
4
PIN CONFIGURATION
...................................................................................
5
PIN DESCRIPTION
........................................................................................
5
ABSOLUTE MAXIMUM RATINGS
...................................................................
6
ELECTRICAL CHARACTERISTICS
.................................................................
7
ELECTRICAL CHARACTERITICS BY DETECTOR THRESHOLD
....................
10
OPERATION
................................................................................................
14
TEST CIRCUITS
...........................................................................................
15
TYPICAL CHARACTERISTICS
......................................................................
16
1) Supply Current vs. Input Voltage
...........................................................................
16
2) Detector Threshold vs. Temperature
.......................................................................
16
3) Output Voltage vs. Input Voltage
...........................................................................
17
4) Nch Driver Output Current vs. V
DS
.........................................................................
18
5) Nch Driver Output Current vs. Input Voltage
................................................................
19
6) Pch Driver Output Current vs. Input Voltage
................................................................
20
7) Output Delay Time vs. Load Capacitance
..................................................................
20
8) Output Delay Time vs. Input Pin Capacitance
..............................................................
21
TYPICAL APPLICATIONS
............................................................................
22
• R
× ×
A CPU Reset Circuit(Nch Open Drain Output)
.......................................................
22
5VT
• R
× ×
C CPU Reset Circuit(CMOS Output)
................................................................
22
5VT
• R
× ×
A Output delay Time Circuit 1
.......................................................................
22
5VT
• R
× ×
A Output delay Time Circuit 2
.......................................................................
22
5VT
• Memory Back-up Circuit
.....................................................................................
22
• Voltage Level Indicator Circuit (lighted when the power runs out)
............................................
23
• Detector Threshold Changing Circuit
........................................................................
23
• Window Comparator Circuit
.................................................................................
23
• Excessive Charge Preventing Circuit
........................................................................
23
PACKAGE DIMENSIONS
.............................................................................
25
TAPING SPECIFICATIONS
...........................................................................
26
LOW VOLTAGE DETECTOR
R
×
5VT SERIES
OUTLINE
The R
×
5VT Series are voltage detector ICs with high detector threshold accuracy and ultra-low supply current
by CMOS process, which can be operated at an extremely low voltage and is used, for instance, for system reset.
Each of these ICs consists of a voltage reference unit, a comparator, resistors for voltage detection, an output
driver and a hysteresis circuit. The detector threshold is fixed with high accuracy.
5VT Series are operable by a lower voltage than that for the R
×
5VL Series, and can be driven by a sin-
The R
×
gle battery.
Two output types, Nch open drain type and CMOS type, are available. Three types of packages, TO-92, SOT-
89 (Mini-power Mold), SOT-23-5 (Mini-mold), are available.
FEATURES
• Ultra-low Supply Current ............................TYP. 0.8µA (V
DD
=1.5V)
• Broad Operating Voltage Range .................. 0.7V to 10.0V (Topt =25˚C)
• Detector Threshold ........................................Stepwise setting with a step of 0.1V in the range of 0.9V to 6.0V
is possible (refer to Selection Guide).
• High Accuracy Detector Threshold ..............±2.5%
• Low Temperature-Drift Coefficien of Detector Threshold ..............TYP. ±100ppm/˚C
• Two Output Types .........................................Nch Open Drain and CMOS
• Three Types of Packages ..............................TO-92, SOT-89 (Mini-power Mold), SOT-23-5 (Mini-mold)
APPLICATIONS
•
CPU & Logic Circuit Reset
•
Battery Checker
•
Window Comparator
•
Wave Shaping Circuit
•
Battery Back-Up Circuit
•
Power Failure Detector
1
嵌入式系统
