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Part: MAX691CPE
Category:
Description: Ic-supervisory Circuit
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Datasheet: Download MAX691CPE datasheet File size : 736 kB
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R
19-4333; Rev 3; 9/93
Microprocessor Supervisory Circuits
__________________General Description
The MAX690A/MAX692A/MAX802L/MAX802M/MAX805L r e d u c e the complexity and number of components required for power-supply monitoring and battery-control functions in microprocessor (µP) systems. They significantly improve system reliability and accuracy compared to separate ICs or discrete components. These parts provide four functions: 1) A reset output during power-up, power-down, and brownout conditions. 2) Battery-backup switching for CMOS RAM, CMOS µP, or other low-power logic. 3) A reset pulse if the optional watchdog timer has not been toggled within 1.6sec. 4) A 1.25V threshold detector for power-fail warning or low-battery detection, or to monitor a power supply other than +5V. The parts differ in their reset-voltage threshold levels and reset outputs. The MAX690A/MAX802L/MAX805L generate a reset pulse when the supply voltage drops below 4.65V, and the MAX692A/MAX802M generate a reset below 4.40V. The MAX802L/MAX802M guarantee power-fail accuracies to ±2%. The MAX805L is the same as the MAX690A except that RESET is provided instead of RESET. All parts are available in 8-pin DIP and SO packages. The MAX690A/MAX802L are pin compatible with the MAX690 and MAX694. The MAX692A/MAX802M are pin compatible with the MAX692.
___________________________Features
o Precision Supply-Voltage Monitor: 4.65V for MAX690A/MAX802L/MAX805L 4.40V for MAX692A/MAX802M o Reset Time Delay 200ms o Watchdog Timer 1.6sec Timeout o Battery-Backup Power Switching o 200µA Quiescent Supply Current o 50nA Quiescent Supply Current in BatteryBackup Mode o Voltage Monitor for Power-Fail or Low-Battery Warning o Power-Fail Accuracy Guaranteed to ±2% (MAX802L/M) o Guaranteed ESET Assertion to VCC = 1V o 8-Pin SO and DIP Packages
MAX690A/MAX692A/MAX802L/MAX802M/MAX805L
______________Ordering Information
PART MAX690ACPA MAX690ACSA MAX690AC/D MAX690AEPA MAX690AESA MAX690AMJA TEMP. RANGE 0°C to +70°C 0°C to +70°C 0°C to +70°C -40°C to +85°C -40°C to +85°C -55°C to +125°C PIN-PACKAGE 8 Plastic DIP 8 SO Dice* 8 Plastic DIP 8 SO 8 CERDIP**
_______________________Applications
Battery-Powered Computers and Controllers Intelligent Instruments Automotive Systems Critical µP Power Monitoring
Ordering Information continued on last page. * Dice are specified at TA = +25°C ** Contact factory for availability and processing to MIL-STD-883.
_________________Pin Configurations
T O P VIEW
__________Typical Operating Circuit
UNREGULATED DC REGULATED +5V O.1µF VCC VCC PFI R2 L 3.6V BITHIUM ATTERY RESET PFO RESET NMI µP VCC VOUT 1 2 8 VBATT RESET (RESET) WDI PFO
R1
GND 3 PFI 4
WDI VBATT VOUT GND
I/O LINE GND BUS VCC CMOS R AM GND
MAX690A MA X 6 9 2 A M AX802L MA X 8 0 2 M AX805L
DIP/SO
7 6 5
MAX690A AX802L
( ) ARE FOR MAX805L ONLY.
________________________________________________________________ Maxim Integrated Products
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Microprocessor Supervisory Circuits MAX690A/MAX692A/MAX802L/MAX802M/MAX805L
ABSOLUTE MAXIMUM RATINGS
Terminal Voltage (with respect to GND) VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 6.0V VBATT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 6.0V All Other Inputs (Note 1) . . . . . . . . . . . . . . . . -0.3V to (VCC + 0.3V) Input Current VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 200mA VBATT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50mA GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20mA Output Current VOUT . . . . . . . . . . . . . . . . . . . Short-Circuit Protected for up to 10sec All Other Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20mA Rate of Rise, VCC, VBATT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100V/µs Continuous Power Dissipation Plastic DIP (derate 9.09mW/°C above +70°C) . . . . . . . . 727mW SO (derate 5.88mW/°C above +70°C) . . . . . . . . . . . . . . . . 471mW CERDIP (derate 8.00mW/°C above +70°C) . . . . . . . . . . . 640mW Operating Temperature Ranges: MAX69_AC_ _, MAX80_ _ C_ _ . . . . . . . . . . . . . . . . . . 0°C to +70°C MAX69_AE_ _, MAX80_ _ E_ _ . . . . . . . . . . . . . . . . -40°C to +85°C MAX69_AMJA, MAX805LMJA. . . . . . . . . . . . . . . . -55°C to +125°C Storage Temperature Range . . . . . . . . . . . . . . . . . . -65°C to +160°C Lead Temperature (soldering, 10sec) . . . . . . . . . . . . . . . . . . +300°C
Note 1: The input voltage limits on PFI and WDI may be exceeded if the current into these pins is limited to less than 10mA.
Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond 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
( V C C = 4.75V to 5.5V for MAX690A/MAX802L/MAX805L, V C C = 4.5V to 5.5V for MAX692A/MAX802M, V B A T T = 2.8V, TA = TMIN to TMAX, unless otherwise noted.) PARAMETER Operating Voltage Range, VCC, VBATT (Note 2) Supply Current (Excluding IOUT) ISUPPLY in Battery-Backup Mode (Excluding IOUT) VBATT Standby Current (Note 3) VOUT Output VOUT in Battery-Backup Mode Battery Switch Threshold, VCC to VBATT Battery Switchover Hysteresis MAX690A, MAX802L, MAX805L Reset Threshold VRT MAX692A, MAX802M MAX802L, TA = +25°C, VCC falling MAX802M, TA = +25°C, VCC falling Reset Threshold Hysteresis Reset Pulse Width tRS ISOURCE = 800µA ISINK = 3.2mA RESET Output Voltage MAX69_AC, MAX802_C, VCC = 1.0V ISINK = 50µA MAX69_AE/M, MAX802_E, VCC = 1.2V, ISINK = 100µA 2 _______________________________________________________________________________________ 140 VCC - 1.5 4.50 4.25 4.55 4.30 40 200 280 0.4 0.3 0.3 V ISUPPLY SYMBOL CONDITIONS MAX69_AC, MAX802_C MAX805LC MAX69_AE/M, MAX80_ _E MAX69_AC, MAX802_C MAX69_AE/M, MAX802_E, MAX805LE/M TA = +25°C VCC = 0V, VBATT = 2.8V TA = TMIN to TMAX 5.5V > VCC> VBATT +0.2V IOUT = 5mA IOUT = 50mA IOUT = 250µA, VCC < VBATT - 0.2V VCC < VRT Power-up Power-down TA = +25°C TA = TMIN to TMAX -0.1 MIN 1.0 1.1 1.2 200 200 0.05 TYP MAX 5.5 5.5 5.5 350 500 1.0 5.0 0.02 -1.0 0.02 VCC - 0.05 VCC - 0.025 VCC - 0.5 VCC - 0.25 20 -20 40 4.65 4.40 4.75 4.50 4.70 4.45 mV ms V VBATT - 0.1 VBATT - 0.02 µA µA µA V V mV mV UNITS V
Microprocessor Supervisory Circuits
ELECTRICAL CHARACTERISTICS (continued)
( V C C = 4.75V to 5.5V for MAX690A/MAX802L/MAX805L, V C C = 4.5V to 5.5V for MAX692A/MAX802M, V B A T T = 2.8V, TA = TMIN to TMAX, unless otherwise noted.) PARAMETER SYMBOL CONDITIONS MAX805LC, ISOURCE = 4µA, VCC = 1.1V RESET Output Voltage MAX805LE/M, ISOURCE = 4µA, VCC = 1.2V MAX805L, ISOURCE = 800µA MAX805L, ISINK = 3.2mA Watchdog Timeout WDI Pulse Width WDI Input Threshold (Note 4) WDI Input Current PFI Input Threshold PFI Input Current P F O Output Voltage ISOURCE = 800µA ISINK = 3.2mA tWD tWP VIL = 0.4V, VIH = (0.8) (VCC) VCC = 5V WDI = VCC WDI = 0V MAX69_A, MAX805L, VCC = 5V MAX802_C/E, VCC = 5V -150 1.20 1.225 -25 VCC - 1.5 Logic low Logic high 3.5 50 -50 1.25 1.250 0.01 1.30 1.275 25 0.4 150 1.00 50 0.8 1.60 MIN 0.8 0.9 VCC - 1.5 0.4 2.25 sec ns V µA V nA V V TYP MAX UNITS
MAX690A/MAX692A/MAX802L/MAX802M/MAX805L
Note 2: Either VCC or VBATT can go to 0V, if the other is greater than 2.0V. Note 3: "-" = battery-charging current, "+" = battery-discharging current. Note 4: WDI is guaranteed to be in an intermediate, non-logic level state if WDI is floating and VCC is in the operating voltage range. WDI is internally biased to 35% of VCC with an input impedance of 50k.
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