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TC71

TelCom
Part Number TC71
Manufacturer TelCom
Description SYSTEM SUPERVISOR
Published Aug 21, 2005
Detailed Description 1 TC70/71 MICROMASTER™ – SYSTEM SUPERVISOR WITH POWER SUPPLY MONITOR, WATCHDOG AND BATTERY BACKUP FEATURES s Maximum Fun...
Datasheet PDF File TC71 PDF File

TC71
TC71

Overview
1 TC70/71 MICROMASTER™ – SYSTEM SUPERVISOR WITH POWER SUPPLY MONITOR, WATCHDOG AND BATTERY BACKUP FEATURES s Maximum Functional Integration: Precision Power Supply Monitor, Watchdog Timer, External RESET Override, Threshold Detector and Battery Backup Controller in an 8-Pin Package Generates Power-on RESET and Guards Against Unstable Processor Operation Resulting from Power "Brown-out" Automatically Halts and Restarts an Out-ofControl Microprocessor Output Can be Wire-ORed, or Hooked to Manual RESET Pushbutton Switch Watchdog Disable Pin for Easier Prototyping (TC70) Voltage Monitor for Power Fail or Low Battery Warning (TC71) Available in 8-Pin Plastic DIP or 8-Pin SOIC Packages Cost Effective 2 3 4 5 6 7 GENERAL DESCRIPTION The TC70/71 is a fully-integrated power supply monitor, watchdog and battery backup circuit in a space-saving 8-pin package.
When power is initially applied, the TC70/71 holds the processor in its reset state for a minimum of 500msec after VCC is in tolerance to ensure stable system start-up.
After start-up, processor sanity is monitored by the on-board watchdog circuit.
The processor must provide periodic highto-low level transitions to the TC70/71 to verify proper execution.
Should the processor fail to supply this signal within the specified timeout period, an out-of-control processor is indicated and the TC70/71 issues a momentary processor reset as a result.
The TC70 also features a watchdog disable pin to facilitate system test and debug.
The output of the TC70/71 can be wire-ORed to a pushbutton switch (or electronic signal) to reset the processor.
When connected to a push-button switch, the TC70/71 provides contact debounce.
The integrated battery backup circuit on-board the TC70/ 71 converts CMOS RAM into nonvolatile memory by first write-protecting, then switching the VCC line of the RAM over to an external battery.
The TC71 incorporates an additional 1.
3V threshold detector for power fail warning, low battery detection or to monito...


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