TL7712资料

Supply voltage Supervisor

TL77xx Series

Author: Eilhard Haseloff

Literature Number: SLVAE04March 1997元器件交易网www.cecb2b.comIMPORTANT NOTICE

Texas Instruments (TI) reserves the right to make changes to its products or todiscontinue any semiconductor product or service without notice, and advises itscustomers to obtain the latest version of relevant information to verify, before placingorders, that the information being relied on is current.TI warrants performance of its semiconductor products and related software to thespecifications applicable at the time of sale in accordance with TI’s standard warranty.Testing and other quality control techniques are utilized to the extent TI deemsnecessary to support this warranty. Specific testing of all parameters of each device isnot necessarily performed, except those mandated by government requirements.Certain applications using semiconductor products may involve potential risks of death,personal injury, or severe property or environmental damage (“Critical Applications”).TI SEMICONDUCTOR PRODUCTS ARE NOT DESIGNED, INTENDED,AUTHORIZED, OR WARRANTED TO BE SUITABLE FOR USE IN LIFE-SUPPORTAPPLICATIONS, DEVICES OR SYSTEMS OR OTHER CRITICAL APPLICATIONS.Inclusion of TI products in such applications is understood to be fully at the risk of thecustomer. Use of TI products in such applications requires the written approval of anappropriate TI officer. Questions concerning potential risk applications should bedirected to TI through a local SC sales office.In order to minimize risks associated with the customer’s applications, adequate designand operating safeguards should be provided by the customer to minimize inherent orprocedural hazards.TI assumes no liability for applications assistance, customer product design, softwareperformance, or infringement of patents or services described herein. Nor does TIwarrant or represent that any license, either express or implied, is granted under anypatent right, copyright, mask work right, or other intellectual property right of TI coveringor relating to any combination, machine, or process in which such semiconductorproducts or services might be or are used.

Copyright © 1982, 1997, Texas Instruments Incorporated元器件交易网www.cecb2b.com

Supply voltage Supervisor TL77xx SeriesiiiContents

1. Introduction............................................................................................................................12. Circuit Description..................................................................................................................23. Application examples.............................................................................................................54. Design Tips..........................................................................................................................125. Summary.............................................................................................................................14

List of Figures1 Reset circuit.................................................................................................................................12 Functional Diagram......................................................................................................................33 Diagram for Calculation of Ct.......................................................................................................34 Timing diagram............................................................................................................................45 TL7705A in 5 Volt Microcomputer Applications...........................................................................66 Voltage Supervision of a multiple power supply..........................................................................67 Typical Trigger Sensitivity at the SENSE input of the voltage monitor TL7705A.........................78 Circuit for Reduced Trigger Sensitivity........................................................................................89 Modified Output Circuit................................................................................................................910 Circuit Diagram for Data Protection in a battery buffered memory............................................1011 Typical Variation of the Reference Voltage Vref versus supply Voltage Variations.....................1012 Typical Variation of the Reference Voltage Vref versus Ambient Temperature Variations.........1113 Buffered Circuit for the Reference Voltage................................................................................1214 Printed Circuit Layout for the supply voltage supervisor...........................................................1315 Series Resistor at the Ct input of the TL770xB..........................................................................14元器件交易网www.cecb2b.com