SP791 Low Power Microprocessor Supervisory with Battery Switch-Over n Precision 4.65V Voltage Monitoring n 200ms Power-OK/Reset Time Delay n Independent Watchdog Time-Preset or Adjustable n 75A Maximum Operating Supply Current n 1.0A Maximum Battery Backup Current n 0.1A Maximum Battery Standby Current n Power Switching 250mA Output in Vcc Mode (0.6) 25mA Output in Battery Mode (5) n On-Board Gating of Chip-Enable Signals Memory Write-Cycle Completion 6ns CE Gate Propagation Delay n Voltage Monitor for Power-Fail or Low Battery n Backup-Battery Monitor n RESET Valid to Vcc=1V n Pin Compatible Upgrade to MAX791 Now available in Lead Free DESCRIPTION The SP791 is a microprocessor (P) supervisory circuit that integrates a myriad of compo- nents involved in discrete solutions to monitor power-supply and battery-control functions in P and digital systems. The SP791 offers complete P monitoring and watchdog functions. The SP791 is ideal for a low-cost battery management solution and is well suited for portable, battery-powered applications with its supply current of 40A. The 6ns chip-enable propaga- tion delay, the 25mA current output in battery-backup mode, and the 250mA current output in standard operation also makes the SP791 suitable for larger scale, high-performance equipment. SP791 15 RESET 1 VBATT 3 Vcc VOUT + + 10 4.65V LOWLINE 150mV 9 + MR 5 BATT ON RESET + GENERATION + 2 V OUT TIMEBASE FOR 8 SWT RESET AND WATCHDOG WATCHDOG TIMER 11 WATCHDOG WDI TRANSITION + CHIP-ENABLE DETECTOR OUTPUT CONTROL 7 2V PFI + 12 1.25V CE OUT 14 16 4 GND 13 6 PFO WDO WDPO CE IN Figure 1. Block Diagram SP791DS/08 SP791 Low Power Microprocessor Supervisory with Battery Switch-Over Copyright 2000 Sipex Corporation 1ABSOLUTE MAXIMUM RATINGS Input Voltage (with respect to GND) Stresses beyond these listed underAbsolute Maximum VCC..................................................-0.3V to +6V VBATT............................................-0.3V to +6V Rating may cause permanent damage to the device. These All Other Inputs ................-0.3V to (VOUT + 0.3V) are stress ratings only, and functional operation of the de- Input Current vice at these or any other conditions beyond those indi- VCC Peak..................................................... 1.0A cated in the operational sections of the specifications is VCC Continuous .......................................250mA not implied. Exposure to absolute maximum rating condi- VBATT Peak ..............................................250mA VBATT Continuous.......................................25mA tions for extended periods may affect device reliability. GND, BATT ON .........................................100mA All Other Outputs ........................................25mA Operating Temperature Ranges o o SP791C ..............................0 C to +70 C o Continuous Power Dissipation (TA = + 70 C) o o SP791E ...........................-40 C to +85 C o o Plastic DIP (derate 10.53mW/ C above +70 C) o o Storage Temperature Range...........-65 C to +160 C 842mW o Lead Temperature (soldering,10sec)..........+300 C o o Narrow SO (derate 8.70mW/ C above+70 C) 696mW ESD Rating........................................................4KV ELECTRICAL CHARACTERISTICS o (Vcc = 4.75V to 5.5V, VBATT = 2.8V, T = T to T unless otherwise noted, typicals specified at 25 C) A MIN MAX PARAMETER MIN TYP MAX UNITS CONDITIONS Operating Voltage Range 0 5.5 V V , V (Note 1) CC BATT V - 0.05 V - 0.015 V = 4.5V, I = 25mA CC CC CC OUT V in Normal V - 0.3 V - 0.15 V V = 4.5V, I = 250mA OUT CC CC CC OUT Operating Mode V - 0.2 V - 0.09 V =3.0V V = 2.8V, I = 100mA CC CC CC BATT OUT 0.6 1.2 V =4.5V CC V -to-V On Resistance CC OUT 0.9 2.0 V =3.0V CC V - 0.3 V =4.5V, I =20mA BATT BATT OUT V in Battery Backup Mode V - 0.25 V V =2.8V, I =10mA OUT BATT BATT OUT V - 0.15 V =2.0V, I =5mA BATT BATT OUT 515 V =4.5V BATT V -to-V On Resistance 7 25 V =2.8V BATT OUT BATT 10 30 V =2.0V BATT Supply Current in Normal Operating Mode (Excludes IOUT)4075AV > V 1V CC BATT Supply Current in Battery Backup 0.001 1 A V < V 1.2V V = 2.8V CC BATT BATT Mode (Excludes IOUT) (Note 2) VBATT Standby Current -0.1 0.02 A V + 0.2V < V BATT CC (Note 3) Battery-Switchover Threshold V +0.03 Power up BATT V -0.03 V Power down BATT Battery-Switch over Hysteresis 60 mV Peak to Peak Low-Battery Detector Threshold 2 V SP791DS/08 SP791 Low Power Microprocessor Supervisory with Battery Switch-Over Copyright 2000 Sipex Corporation 2