Microprocessor a Supervisory Circuits ADM690A/ADM692A/ADM802L/M/ADM805L/M FUNCTIONAL BLOCK DIAGRAM FEATURES Precision Supply Voltage Monitor 4.65 V ADM690A/ADM802L/ADM805L V BATT 4.40 V ADM692A/ADM802M/ADM805M BATTERY V OUT Reset Assertion Down to 1 V V CC SWITCHOVER Reset Timeout200 ms V CC Watchdog Timer1.6 s 100 mA Quiescent Supply Current RESET RESET 4.65V* GENERATOR Automatic Battery Backup Power Switching (RESET) Voltage Monitor for Power Fail ADM690A 62% Power Fail Accuracy on ADM802L/M WATCHDOG WATCHDOG ADM692A TRANSITION DETECTOR Space-Saving MicroSOIC Package (ADM690A) INPUT (WDI) (1.6s) ADM802L ADM802M APPLICATIONS ADM805L Microprocessor Systems POWER FAIL ADM805M Computers POWER FAIL INPUT (PFI) OUTPUT (PFO) Controllers 1.25V Intelligent Instruments *4.4V FOR ADM692A/ADM802M/ADM805M ( ) = ADM805L/M ONLY GENERAL DESCRIPTION The ADM690A/ADM692A/ADM802L/M/ADM805L/M The ADM805L/M provides an active high reset output, RESET family of supervisory circuits offers complete single chip instead of RESET. solutions for power supply monitoring and battery control The family of products is fabricated using an advanced epitaxial functions in microprocessor systems. These functions include CMOS process combining low power consumption and high P reset, backup battery switchover, watchdog timer, and power reliability. RESET assertion is guaranteed with V as low as 1 V. CC failure warning. They provide a pin-compatible upgrade for the MAX690A/ The ADM690A/ADM692A/ADM802L/M/ADM805L/M are MAX692A/MAX802L/MAX802M/MAX805L available in 8-pin packages and provide: All parts are available in 8-pin DIP and SOIC packages. The 1. Power-on reset output during power-up, power-down and ADM690A is also available in a new space-saving microSOIC brownout conditions. The RESET output remains opera- package. tional with V as low as 1 V. CC 2. Battery backup switching for CMOS RAM, CMOS microprocessor or other low power devices. 3. A reset pulse if the optional watchdog timer has not been toggled within 1.6 seconds. 4. A 1.25 V threshold detector for power fail warning, low battery detection, or to monitor a power supply other than +5 V. On the ADM690A/ADM802L/ADM805L the reset voltage threshold is 4.65 V. On the ADM692A/ADM802M/ ADM805M, the reset voltage threshold is 4.40 V. The ADM802L/ADM802M guarantee power fail accuracies to 2%. REV. 0 Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. use, nor for any infringements of patents or other rights of third parties Tel: 617/329-4700 World Wide Web Site: ADM690A/ADM692A/ADM802L/M/ADM805L/MSPECIFICATIONS (V = 4.75 V to 5.5 V (ADM690A/ADM802L/ADM805L), V = 4.5 V to 5.5 V, (ADM692A/ADM802M/ADM805M), V = +2.8 V, T = T to T CC CC BATT A MIN MAX unless otherwise noted) Parameter Min Typ Max Units Test Conditions/Comments 1 V /V OPERATION CC BATT V Operating Voltage Range 1.0 5.5 V CC Supply Current (Excludes I ) 70 100 A OUT Supply Current in Battery Backup Mode 0.05 1.0 AV = 0 V, V = 2.8 V CC BATT Battery Standby Current 5.5 V > V > V + 0.2 V CC BATT (+ = Discharge, = Charge) 0.1 +0.02 A V Output Voltage V 0.02 V 0.01 V I = 5 mA OUT CC CC OUT V 0.5 V 0.05 V I = 50 mA CC CC OUT V 0.02 V I = 250 mA CC OUT V in Battery Backup Mode V 0.05 V 0.002 V I = 250 A, V < V 0.2 V OUT BATT BATT OUT CC BATT Battery Switchover Threshold 20 mV Power Up 20 mV Power Down Battery Switchover Hysteresis 40 mV RESET THRESHOLD Reset Voltage Threshold ADM690A, ADM802L, ADM805L 4.5 4.65 4.75 V ADM692A, ADM802M, ADM805M 4.25 4.4 4.5 V ADM802L 4.55 4.7 V T = 25C, V Falling A CC ADM802M 4.30 4.45 V T = 25C, V Falling A CC Reset Threshold Hysteresis 40 mV Reset Timeout Delay 140 200 280 ms RESET Output Voltage V 1.5 V I = 800 A CC SOURCE 0.4 V I = 3.2 mA SINK 0.3 V I = 100 A, V = 1 V SINK CC RESET Output Voltage 0.8 V I = 4 A, V = 1.1 V SOURCE CC V 1.5 V ADM805L/M, I = 800 A CC SOURCE 0.4 V ADM805L/M, I = 3.2 mA SINK WATCHDOG TIMER Watchdog Timeout Period 1.0 1.6 2.25 s WDI Input Pulse Width 50 ns V = 0.4, V = 0.8 (V ) IL IH CC WDI Input Threshold Logic Low 0.8 V Logic High 3.5 V WDI Input Current 10 A WDI = V CC 10 A WDI = 0 V POWER FAIL DETECTOR PFI Input Threshold 1.20 1.25 1.30 V ADM690A, ADM692A, ADM805L/M 1.225 1.25 1.275 V ADM802L/M PFI Input Current 25 0.01 +25 nA PFO Output Voltage V 1.5 V I = 800 A CC SOURCE 0.4 V I = 3.2 mA SINK NOTES 1 Either V or V can be 0 V if the other > +2.0 V. CC BATT Specifications subject to change without notice. REV. 0 2