|Category||Power Management => Battery Management|
|Description||Micromaster - System Supervisor With Power Supply Monitor, Watchdog And Battery Backup|
|Datasheet||Download TC71EPA datasheet
|TC70/71 MICROMASTERTM SYSTEM SUPERVISOR WITH POWER SUPPLY MONITOR, WATCHDOG AND BATTERY BACKUP
s Maximum Functional Integration: Precision Power Supply Monitor, Watchdog Timer, External RESET Override, Threshold Detector and Battery Backup Controller 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
The 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 monitor power supply voltages other than +5V.TYPICAL APPLICATIONS
All Microprocessor-based Systems Test Equipment Instrumentation Set-Top Boxes
8-Pin SOIC 8-Pin Plastic DIP 8-Pin SOIC 8-Pin Plastic DIP 8-Pin SOIC 8-Pin Plastic DIP 8-Pin SOIC 8-Pin Plastic DIPMICROMASTERTM SYSTEM SUPERVISOR WITH POWER SUPPLY MONITOR, WATCHDOG AND BATTERY BACKUP
Voltage (Any Pin) with Respect to Ground................................ GND 0.3 to VCC + 0.3V Operating Temperature Range............... to +85°C Storage Temperature Range................ to +150°C Lead Temperature (Soldering, 10 sec)................. +300°C
*This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operational sections of the specifications is not implied. Exposure to Absolute Maximum Rating Conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS: Recommended DC Operations: TA = TMIN to TMAX, unless otherwise specified.Supply Voltage Input HIGH Level Input HIGH Level Input LOW Level
Note 1 CEI, WDD (Note 1) RS (Note 1) CEI, WDD, RS (Note 1)
ELECTRICAL CHARACTERISTICS: DC: TA = TMIN to TMAX, VCC to 5.5V, unless otherwise specified.
Operating Current Operating Current in Battery Backup Mode Input Leakage Input Leakage Input Leakage Battery Standby Current Battery Standby Current
ELECTRICAL CHARACTERISTICS: DC: Power Supply Monitor, EXT. RESET and Watchdog: TA = TMIN to TMAX, VCC to 5.5V, unless otherwise specified.
Output Current 0.4V (RS, TDO, CEO, PF Pins) Output Current 2.4V (TDO, CEO, PF Pins) WDD Input Current RS Strobe (HIGH) Level RS Strobe (LOW) Level VCC Trip Point
ELECTRICAL CHARACTERISTICS: DC: Battery Backup and Threshold Detector: TA = TMIN to TMAX, VCC to 5.5V, unless otherwise specified.VCCO Output Voltage VOUT in Battery Backup Mode
ELECTRICAL CHARACTERISTICS: (Cont.) DC: Battery Backup and Threshold Detector: TA = TMIN to TMAX, VCC to 5.5V, unless otherwise specified.IOUT1 IOUT2 VSW VHYST VOHCEO VTDI ITDI VTDI (HYST)
VCCO Output Current VCCO Output Current in Battery Backup Mode Battery Switchover Threshold (VCC Falling) Battery Switchover Hysteresis CEO Output Voltage in Battery Backup Mode Threshold Detector Trip Voltage Threshold Detector Input Current Threshold Detector Hysteresis
ELECTRICAL CHARACTERISTICS: AC: Power Supply Monitor, EXT. RESET and Watchdog: TA = TMIN to TMAX, VCC to 5.5V, unless otherwisePB Hold Time Reset Active Time RS STROBE Pulsewidth Watchdog Timeout Period VCC Detect to RS LOW
Figure 4 (Note 4) Figure 6 Figure 3 Figure 3 Figure 6
ELECTRICAL CHARACTERISTICS: AC: Battery Backup and Threshold Detector: TA = TMIN to TMAX, VCC to 5.5V, unless otherwise specified.VCC Fall Time From to 3.0V VCC Rise Time From to 4.25V
All voltages referenced to ground. No output load. Measured with VCCO and CEO open. The RS output must be held low for a minimum 20msec to guarantee a reset.
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