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Part: MAX708ESA
Category:
Power Management
-> Supervisory Circuits
Description: Low-cost, P Supervisory Circuits
Company: Maxim Integrated Products
Datasheet: Download MAX708ESA datasheet File size : 6567 kB
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Datasheet text preview:
19-4334; Rev. 5; 9/95
Low-Cost, µP Supervisory Circuits
_______________General Description
The MAX705-MAX708/MAX813L microprocessor (µP) supervisory circuits reduce the complexity and number of components required to monitor power-supply and battery functions in µP systems. These devices significantly improve system reliability and accuracy compared to separate ICs or discrete components. The MAX705/MAX706/MAX813L provide four functions: 1) A reset output during power-up, power-down, and brownout conditions. 2) An independent watchdog output that goes low if the watchdog input has not been toggled within 1.6 seconds. 3) A 1.25V threshold detector for power-fail warning, low-battery detection, or for monitoring a power supply other than +5V. 4) An active-low manual-reset input. The MAX707/MAX708 are the same as the MAX705/ MAX706, except an active-high reset is substituted for the watchdog timer. The MAX813L is the same as the MAX705, except RESET is provided instead of RESET. Two supply-voltage monitor levels are available: The MAX705/MAX707/MAX813L generate a reset pulse when t h e supply voltage drops below 4.65V, while the MAX706/MAX708 generate a reset pulse below 4.40V. All four parts are available in 8-pin DIP, SO and µMAX packages.
___________________________Features
o µMAX Package: Smallest 8-Pin SO o Guaranteed RESET Valid at VCC = 1V o Precision Supply-Voltage Monitor 4.65V in MAX705/MAX707/MAX813L 4.40V in MAX706/MAX708 o 200ms Reset Pulse Width o Debounced TTL/CMOS-Compatible Manual-Reset Input o Independent Watchdog Timer--1.6sec Timeout (MAX705/MAX706) o Active-High Reset Output (MAX707/MAX708/MAX813L) o Voltage Monitor for Power-Fail or Low-Battery Warning
MAX705MAX708/MAX813L
______________Ordering Information
PART MAX705CPA MAX705CSA MAX705CUA MAX705C/D TEMP. RANGE 0°C to +70°C 0°C to +70°C 0°C to +70°C 0°C to +70°C PIN-PACKAGE 8 Plastic DIP 8 SO 8 µMAX Dice*
_______________________Applications
Computers Controllers Intelligent Instruments Automotive Systems Critical µP Power Monitoring
Ordering Information continued at end of data sheet. * Dice are specified at TA = +25°C. ** Contact factory for availability and processing to MIL-STD-883.
_________________Pin Configurations
T O P VIEW
MR VCC 1 2 8 7 WDO RESET (RESET) WDI PFO
GND 3
__________Typical Operating Circuit
UNREGULATED DC
PFI 4
MAX705 M AX706 AX813L
DIP/SO
6 5
MAX667 +5V DC LINEAR REGULATOR
µP R VCC ESET PFI PFI MAX705 WDO M AX706 PFO MR VCC RESET I/O LINE NMI INTERRUPT
MR VCC
1 2
8 7
RESET RESET N.C. PFO
GND 3 PFI 4
MAX707 AX708
6 5
PUSHBUTTON S WITCH
AX813L
DIP/SO
( ) ARE FOR MAX813L ONLY. Pin Configurations continued at end of data sheet.
________________________________________________________________ Maxim Integrated Products
1
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Low-Cost, µP Supervisory Circuits MAX705MAX708/MAX813L
ABSOLUTE MAXIMUM RATINGS
Terminal Voltage (with respect to GND) VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 6.0V All Other Inputs (Note 1) . . . . . . . . . . . . . . . -0.3V to (VCC + 0.3V) Input Current VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20mA GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20mA Output Current (all outputs) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20mA Continuous Power Dissipation Plastic DIP (derate 9.09mW/°C above +70°C) . . . . . . . 727mW SO (derate 5.88mW/°C above +70°C) . . . . . . . . . . . . . . . 471mW µMAX (derate 4.10mW/°C above +70°C) . . . . . . . . . . . . 330mW CERDIP (derate 8.00mW/°C above +70°C) . . . . . . . . . . 640mW Operating Temperature Ranges MAX70_C__, MAX813LC__ . . . . . . . . . . . . . . . . . . . . 0°C to +70°C MAX70_E__, MAX813LE__ . . . . . . . . . . . . . . . . . . . -40°C to +85°C MAX70_MJA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -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 MR can be exceeded if the input current is 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
(VCC = 4.75V to 5.5V for MAX705/MAX707/MAX813L, VCC = 4.5V to 5.5V for MAX706/MAX708, TA = TMIN to TMAX, unless otherwise noted.) PARAMETER Operating Voltage Range SYMBOL VCC CONDITIONS MAX70_C MAX813LC MAX70_E/M, MAX813LE/M MAX705C, MAX706C, MAX813LC MAX705E/M, MAX706E/M, MAX813LE/M MAX707C, MAX708C MAX707E/M, MAX708E/M MAX705, MAX707, MAX813L MAX706, MAX708 MIN 1.0 1.1 1.2 150 150 50 50 4.65 4.40 40 200 TYP MAX 5.5 5.5 5.5 350 500 350 500 4.75 4.50 280 0.4 0.3 0.3 0.4 V UNITS V
Supply Current
ISUPPLY
µA
Reset Threshold (Note 2) Reset Threshold Hysteresis (Note 2) Reset Pulse Width (Note 2)
VRT
4.50 4.25 140 VCC - 1.5
V mV ms
tRS
RESET Output Voltage
RESET Output Voltage
Watchdog Timeout Period WDI Pulse Width Low WDI Input Threshold High WDI Input Current
tW D tWP
ISOURCE = 800µA ISINK = 3.2mA MAX70_C, VCC = 1V, ISINK = 50µA MAX70_E/M, VCC = 1.2V, ISINK = 100µA MAX707, MAX708, ISOURCE = 800µA VCC - 1.5 MAX707, MAX708, ISINK = 1.2mA MAX813LC, ISOURCE = 4µA, VCC = 1.1V 0.8 MAX813LE/M, ISOURCE = 4µA, VCC = 1.2V 0.9 ISOURCE = 800µA VCC - 1.5 MAX813L ISINK = 3.2mA MAX705, MAX706, MAX813L 1.00 1.60 VIL = 0.4V, VIH = (VCC) (0.8) 50 MAX705, MAX706, MAX813L, VCC = 5V MAX705, MAX706, MAX813L, WDI = VCC MAX705, MAX706, MAX813L, WDI = 0V MAX705, MAX706, MAX813L, ISOURCE = 800µA MAX705, MAX706, MAX813L, ISINK = 1.2mA 3.5 -150 VCC - 1.5 50 -50
V
0.4 2.25 0.8 150
sec ns V µA
WDO Output Voltage
V 0.4
2
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Low-Cost, µP Supervisory Circuits
ELECTRICAL CHARACTERISTICS (continued)
(VCC = 4.75V to 5.5V for MAX705/MAX707/MAX813L, VCC = 4.5V to 5.5V for MAX706/MAX708, TA = TMIN to TMAX, unless otherwise noted.) PARAMETER MR Pull-Up Current MR Pulse Width MR Input Threshold Low High tMD VCC = 5V ISOURCE = 800µA ISINK = 3.2mA 1.20 -25.00 VCC - 1.5 0.4 1.25 0.01 tMR SYMBOL MR = 0V CONDITIONS MIN 100 150 0.8 2.0 250 1.30 25.00 TYP 250 MAX 600 UNITS µA ns V ns V nA V
MAX705MAX708/MAX813L
MR to Reset Out Delay (Note 2) PFI Input Threshold PFI Input Current PFO Output Voltage
Note 2: Applies to both RESET in the MAX705-MAX708 and RESET in the MAX707/MAX708/MAX813L.
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