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Part: MAX690S
Category:
Power Management
-> Supervisory Circuits
-> Microprocessor Supervisors
Description: P Reset ic With Watchdog And Battery Switchover
Company: Maxim Integrated Products
Datasheet: Download MAX690S datasheet File size : 736 kB
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Datasheet text preview:
19-0243; Rev 1; 9/94
3.0V/3.3V Microprocessor Supervisory Circuits
_______________General Description
These microprocessor (µP) supervisory circuits reduce the complexity and number of components required for power-supply monitoring and battery-control functions in µP systems. They significantly improve system reliab i l i t y and accuracy compared to separate ICs or discrete components. These devices are designed for use in systems powered by 3.0V or 3.3V supplies. See the selector guide in the back of this data sheet for similar devices designed for 5V systems. The suffixes denote different reset threshold voltages: 3.075V (T), 2.925V (S), and 2.625V (R) (see Reset Threshold section in the Detailed Description). All these parts are available in 8-pin DIP and SO packages. Functions offered in this series are as follows:
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____________________________Features
o o o o o o o o o o o ---- ---- RESET and RESET Outputs Manual Reset Input Precision Supply-Voltage Monitor 200ms Reset Time Delay Watchdog Timer (1.6sec timeout) Battery-Backup Power Switching-- Battery Can Exceed VCC in Normal Operation 40µA VCC Supply Current 1µA Battery Supply Current Voltage Monitor for Power-Fail or Low-Battery Warning ---- ---- Guaranteed RESET Assertion to VCC = 1V 8-Pin DIP and SO Packages
MAX690T/S/R, 704T/S/R, 802T/S/R, 804806T/S/R
______________Ordering Information
PART** MAX690_CPA MAX690_CSA MAX690_C/D MAX690_EPA MAX690_ESA MAX690_MJA 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
Part MAX690 MAX704 MAX802 MAX804 MAX805 MAX806
________________________Applications
Battery-Powered Computers and Controllers Embedded Controllers Intelligent Instruments Automotive Systems Critical µP Power Monitoring Portable Equipment
__________________Pin Configuration
TOP VIEW
VOUT VCC GND
(
ARE FOR MAX704T/S/R, MAX806T/S/R
Call toll free 1-800-998-8800 for free samples or literature.
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Ma
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±4% ±4% ±2% ±2% ±4% ±2%
±75mV ±75mV ±2% ±2% ±75mV ±2%
Ordering Information continued on last page. * Contact factory for dice specifications. ** These parts offer a choice of reset threshold voltage. Select the letter corresponding to the desired nominal reset threshold voltage (T = 3.075V, S = 2.925V, R = 2.625V) and insert it into the blank to complete the part number.
_________Typical Operating Circuits
REGULATED +3.3V OR +3.0V UNREGULATED D C 0.1µF R1 VCC VCC ( RESET RESET)
µP
RESET NMI I/O LINE GND BUS
PFO PFI MAX690T/S/R WDI
1 2 3 4
PFI
MAX690T/S/R MAX704T/S/R MAX802T/S/R MAX804T/S/R MAX805T/S/R AX806T/S/R
DIP/SO
8 7 6 5
VBATT RESET (RESET) WDI PFO
R2
L 3.6V BITHIUM ATTERY
MAX802T/S/R MAX804T/S/R AX805T/S/R
GND
VBATT 0.1µF
VOUT 0.1µF VCC CMOS RAM GND
) ARE FOR MAX804T/S/R, MAX805T/S/R
( ) ARE FOR MAX804T/S/R, MAX805T/S/R See last page for MAX704T/S/R, MAX806T/S/R.
________________________________________________________________ Maxim Integrated Products
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3.0V/3.3V Microprocessor Supervisory Circuits MAX690T/S/R, 704T/S/R, 802T/S/R, 804806T/S/R
ABSOLUTE MAXIMUM RATINGS
Terminal Voltage (with respect to GND) VCC.......-0.3V to 6.0V VBATT ...........-0.3V to 6.0V All Other Inputs ..........-0.3V to the higher of VCC or VBATT Continuous Input Current VCC ..........100mA VBATT .......18mA GND ..........18mA Output Current -- -- -- ---- -- R E S E T , P F O ...........18mA VOUT ........100mA Continuous Power Dissipation (TA = +70°C) 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 MAX690_C_ _/MAX704_C_ _/MAX80_ _C_ _ ........0°C to +70°C MAX690_E_ _/MAX704_E_ _/MAX80_ _E_ _. .....-40°C to +85°C MAX690_M_ _/MAX704_M_ _/MAX80_ _M_ _...-55°C to +125°C Storage Temperature Range .....-65°C to +160°C Lead Temperature (soldering, 10sec) .....+300°C
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
(VCC = 3.17V to 5.5V for the MAX690T/MAX704T/MAX80_T, VCC = 3.02V to 5.5V for the MAX690S/MAX704S/MAX80_S, VCC = 2.72V to 5.5V for the MAX690R/MAX704R/MAX80_R; VBATT = 3.6V; TA = TMIN to TMAX; unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER Operating Voltage Range, VCC, VBATT (Note 1) SYMBOL CONDITIONS MAX690_C, MAX704_C, MAX80_ _C MAX690_E/M, MAX704_E/M, MAX80_ _E/M MAX690_C/E, MAX704_C/E, MAX80_ _C/E, VCC < 3.6V VCC Supply Current (excluding IOUT) -- M R = VCC (MAX704_/ MAX806_) MAX690_C/E, MAX704_C/E, MAX80_ _C/E, VCC < 5.5V MAX690_M, MAX704_M, MAX80_ _M, VCC < 3.6V MAX690_M, MAX704_M, MAX80_ _M, VCC < 5.5V VCC Supply Current in BatteryBackup Mode (excluding IOUT) VBATT Supply Current, Any Mode (excluding IOUT) (Note 2) Battery Leakage Current (Note 3) -- M R = VCC (MAX704_/ MAX806_) VCC = 2.0V, VBATT = 2.3V MIN 1.0 1.1 40 50 40 50 TYP MAX 5.5 5.5 50 65 µA 55 70 UNITS V
ISUPPLY
25 0.4 0.4 0.01 0.01 VCC 0.03 VCC 0.3 VCC 0.035 VCC 0.35 VCC 0.0015 VCC 0.015 VCC 0.15 VCC 0.015 VCC 0.15 VCC 0.0006
50 1 10 0.5 5
µA
MAX690_C/E, MAX704_C/E, MAX80_ _C/E MAX690_M, MAX704_M, MAX80_ _M MAX690_C/E, MAX704_C/E, MAX80_ _C/E MAX690_M, MAX704_M, MAX80_ _M MAX690_C/E, MAX704_C/E, MAX80_ _C/E, IOUT = 5mA (Note 4) MAX690_C/E, MAX704_C/E, MAX80_ _C/E IOUT = 50mA
µA µA
VOUT Output Voltage
MAX690_M, MAX704_M, MAX80_ _M IOUT = 5mA (Note 4) MAX690_M, MAX704_M, MAX80_ _M IOUT = 50mA IOUT = 250µA, VCC > 2.5V (Note 4)
V
2
_______________________________________________________________________________________
3.0V/3.3V Microprocessor Supervisory Circuits
ELECTRICAL CHARACTERISTICS (continued)
(VCC = 3.17V to 5.5V for the MAX690T/MAX704T/MAX80_T, VCC = 3.02V to 5.5V for the MAX690S/MAX704S/MAX80_S, VCC = 2.72V to 5.5V for the MAX690R/MAX704R/MAX80_R; VBATT = 3.6V; TA = TMIN to TMAX; unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER SYMBOL CONDITIONS IOUT = 250µA, VBATT = 2.3V VOUT in Battery-Backup Mode IOUT = 1mA, VBATT = 2.3V Battery Switch Threshold, VCC Falling Battery Switch Threshold, VCC Rising (Note 7) VBATT - VCC, VSW > VCC > 1.75V (Note 5) VSW VBATT > VCC (Note 6) This value is identical to the reset threshold, VCC rising MAX690T/704T/805T MAX802T/804T/806T MAX690S/704S/805S Reset Threshold (Note 8) VRST MAX802S/804S/806S MAX690R/704R/805R MAX802R/804R/806S Reset Timeout Period -- -- -- -- ---- P F O , R E S E T Output Voltage -- -- -- -- ---- P F O , R E S E T Output Short to GND Current (Note 4) -- -- -- -- ---- P F O , R E S E T , RESET Output Voltage tWP VOH IOS VCC < 3.6V ISOURCE = 50µA VCC = 3.3V, VOH = 0V ISINK = 1.2mA; MAX690_/704_/802_/806_, VCC = VRST min; MAX804_/805_, VCC = VRST max VBATT = 0V, VCC = 1.0V, ISINK = 40µA, MAX690_C, MAX704_C, MAX80_ _C VOL VBATT = 0V, VCC = 1.2V, ISINK = 200µA, MAX690_E/M, MAX704_E/M, MAX80_ _E/M VBATT = 0V, VCC = VRST min; VRESET = 0V, VCC MAX804_C, MAX805_C MAX804_E/M, MAX805_E/M -1 -10 VCC falling VCC rising VCC falling VCC rising VCC falling VCC rising VCC falling VCC rising VCC falling VCC rising VCC falling VCC rising 3.00 3.00 3.00 3.00 2.85 2.85 2.88 2.88 2.55 2.55 2.59 2.59 140 VCC - 0.3 3.075 3.085 3.075 3.085 2.925 2.935 2.925 2.935 2.625 2.635 2.625 2.635 200 VCC - 0.05 180 500 3.15 3.17 3.12 3.14 3.00 3.02 3.00 3.02 2.70 2.72 2.70 2.72 280 ms V µV V 65 2.30 MIN VBATT - 0.1 TYP VBATT - 0.034 VBATT - 0.14 25 2.40 2.50 MAX UNITS
MAX690T/S/R, 704T/S/R, 802T/S/R, 804806T/S/R
V
mV V V
VOL
0.06
0.3
V
-- -- -- -- ---- P F O , R E S E T Output Voltage
0.13 0.17
0.3 0.3 1
V
RESET Output Leakage Current (Note 9)
µA 10
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