SUMMIT Microelectronics: Product Guide: S4242/S42WD42/S4261/S42WD61 Product Summary 

A complete index to all Product Summary pages   Download the entire S42xx series data sheet Download SMX3199 programming module for the S4242.   Applications Note 10: Using Summit Reset Controllers in Multi-Microcontroller Systems Applications Note 13: Preventing Data Corruption During Power Failures Applications Note 16: Using the S42xx Supervisory Circuit In Dual Supply Voltage Systems Would you like to evaluate a sample?

S42xx BLOCK DIAGRAM   S42xx PIN CONFIGURATION

REQUEST A SAMPLE: Click here to request a sample to evalute.

 

S4242/S42WD42/S4261/S42WD61 Dual Voltage Supervisory Circuit With Watchdog Timer(S42WD61) (S42WD42)   FEATURES Precision Dual Voltage Monitor Automatic VCCSupply Monitor Dual reset outputs for complex microcontroller systems Integrated memory write lockout function No external components required Second voltage monitor output Separate VLOW output Generates interrupt to MCU Generates RESET for dual supply systems Guarantees output assertion to VCC -1V Watchdog Timer (S42WD42, S42WD61) 1.6s Memory Internally Organized as 2x8 Extended Programmable Functions Available on SMS24 High Reliability Endurance: 1,000,000 erase/write cycles Data retention: 100 years

OVERVIEW The S42xxx are a precision power supervisory circuit. It automatically monitors the device's VCC level and will generate a reset output on two complementary open drain outputs. In addition to the VCC monitoring, the S42xxx also provides a second voltage comparator input. This input has an independent open drain output that can be wire- OR'ed with the RESET I/O or it can be used as a system interrupt. The S42xxx also has an integrated 4k/16k-bit nonvolatile memory. The memory conforms to the industry standard two-wire serial interface. In addition to the reset circuitry, the S42WD42/S42WD61 also has a watchdog timer.

ORDERING INFORMATION

SUMMIT Microelectronics, Inc. reserves the right to make changes to the products contained in this publication in order to improve design, performance or reliability. SUMMIT Microelectronics, Inc. assumes no responsibility for the use of any circuits described herein, conveys no license under any patent or other right, and makes no representation that the circuits are free of patent infringement. Charts and schedules contained herein reflect representative operating parameters, and may vary depending upon a user’s specific application. While the information in this publication has been carefully checked, SUMMIT Microelectronics, Inc. shall not be liable for any damages arising as a result of any error or omission. SUMMIT Microelectronics, Inc. does not recommend the use of any of its products in life support or aviation applicationswhere the failure or malfunction of the product can reasonably be expected to cause any failure of either system or tosignificantly affect their safety or effectiveness. Products are not authorized for use in such applications unlessSUMMIT Microelectronics, Inc. receives written assurances, to its satisfaction, that: (a) the risk of injury or damage hasbeen minimized; (b) the user assumes all such risks; and (c) potential liability of SUMMIT Microelectronics, Inc. isadequately protected under the circumstances. Revision 6.1 - This document supersedes all previous versions. Please check the Summit Microelectronics, Inc. web site at www.summitmicro.com for data sheet updates. I2C is a trademark of Philips Corporation.