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TC71COA 데이터시트(PDF) 1 Page - TelCom Semiconductor, Inc |
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TC71COA 데이터시트(HTML) 1 Page - TelCom Semiconductor, Inc |
1 / 7 page 5-7 TELCOM SEMICONDUCTOR, INC. 7 6 5 4 3 1 2 8 TC70/71 MICROMASTER™ – SYSTEM SUPERVISOR WITH POWER SUPPLY MONITOR, WATCHDOG AND BATTERY BACKUP VCC VCCO VBATT TC70/71 CEI (TC70) ∆V DETECTOR WATCHDOG TIMER WDD (TC70) CEO (TC70) TDO (TC71) VREF1 VREF2 VREF3 PF (TC71) TDI (TC71) RS BATTERY BACK-UP CONTROL DELAY TIMER GND PIN CONFIGURATIONS (DIP and SOIC) 1 8 27 3 6 4 5 TC70 1 8 27 3 6 4 5 TC71 CEO VCCO GND CEI VCC VCCO GND TDI VCC WDD VBATT RS TDO PF VBATT RS ORDERING INFORMATION Part No. Package Temp. Range TC70COA 8-Pin SOIC 0 °C to +70°C TC70CPA 8-Pin Plastic DIP 0 °C to +70°C TC70EOA 8-Pin SOIC – 40 °C to +85°C TC70EPA 8-Pin Plastic DIP – 40 °C to +85°C TC71COA 8-Pin SOIC 0 °C to +70°C TC71CPA 8-Pin Plastic DIP 0 °C to +70°C TC71EOA 8-Pin SOIC – 40 °C to +85°C TC71EPA 8-Pin Plastic DIP – 40 °C to +85°C FUNCTIONAL BLOCK DIAGRAM 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 s Generates Power-on RESET and Guards Against Unstable Processor Operation Resulting from Power "Brown-out" s Automatically Halts and Restarts an Out-of- Control Microprocessor s Output Can be Wire-ORed, or Hooked to Manual RESET Pushbutton Switch s Watchdog Disable Pin for Easier Prototyping (TC70) s Voltage Monitor for Power Fail or Low Battery Warning (TC71) s Available in 8-Pin Plastic DIP or 8-Pin SOIC Packages s Cost Effective TYPICAL APPLICATIONS s All Microprocessor-based Systems s Test Equipment s Instrumentation s Set-Top Boxes 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 high- to-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 proces- sor 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 push- button 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 monitor power supply voltages other than +5V. TC70/71-1 11/18/96 |
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