Triple- Power Supply Monitor ADM9261 ERR1 ERR2 ERR3 VREF
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FEATURES Simultaneous Monitoring Supplies Power: Typical Internal Comparator Hysteresis Power Supply Glitch Immunity from Guaranteed from +60oC External Components 8-Pin SOIC Package APPLICATIONS Pagers Portable Instruments
Triple- Power Supply Monitor ADM9261
ERR1 ERR2 ERR3
VREF
ADM9261
GENERAL DESCRIPTION
ADM9261 Multi-Supply Monitor which simultaneously monitors three power supply voltages pager system outputs error signals supply voltages falls below acceptable minimum value. Analog Devices experience design power supply supervisory circuits used provide optimum solution overall circuit terms cost, performance power consumption. features design include incorporation hysteresis glitch immunity into comparators, which minimizes possibility spurious triggering noise spikes supplies being monitored. Power supply voltages outside monitored without need input attenuators other components, current drain (including input currents monitoring circuits) typically only 10µA, which imposes very little additional burden pager's battery. ADM9261 manufactured Analog Devices proprietary BiCMOS processes, which also includes high performance thin film resistors achieve accuracy required precision voltage reference comparator trip points. ADM9261 packaged space-saving µSOIC package.
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Information furnished Analog Devices believed accurate reliable. However, responsibility assumed Analog Devices use, infringements patents other rights third parties which result from use. license granted implication otherwise under patent patent rights Analog Devices. Technology Way, P.O. 9106, Norwood, 02062-9106, U.S.A. Tel: 617/329-4700 World Wide Site: http://www.analog.com Fax: 617/326-8703 Analog Devices, Inc., 1997
ADM9261SPECIFICATIONS
Parameter OPERATING TEMPERATURE RANGE SUPPLY VOLTAGE TOTAL SUPPLY CURRENT
(VCC Full Operating Range, TMIN TMAX unless otherwise noted)
Units Total Current into SU3. Typ. measured with measured with Current from included when when when Measured with Falling Measured with Falling Measured with Falling Test Conditions/Comments
SUPPLY CURRENT INPUT RESISTANCE INPUT RESISTANCE INPUT RESISTANCE TRIP POINT TRIP POINT TRIP POINT HYSTERESIS GLITCH IMMUNITY PROPAGATION DELAY 3.808 2.856 2.666
1.65 1.65 3.904 2.928 2.733
4.00 3.00 2.80
Glitch SU1-3 Delay from Supply Going side Tolerance until Output Changes External Positive Supply External Positive Supply
OPEN DRAIN OUTPUT OPEN DRAIN OUTPUT HIGH
Specifications subject change without notice.
0.25
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ADM9261
ABSOLUTE MAXIMUM RATINGS*
+25°C unless otherwise noted)
ORDERING GUIDE
SU1, SU2, Other Inputs Outputs Output Sink Current ERR1-3, Operating Temperature Range Industrial Version) 40°C +85°C Power Dissipation, RM-8 Thermal Impedance TBD°C/W Lead Temperature (Soldering, secs) +300°C Vapor Phase secs) +215°C Infrared secs) +220°C Storage Temperature Range 65°C +150°C
*Stresses above those listed under Absolute Maximum Ratings cause permanent damage device. This stress rating only; functional operation device these other conditions above those listed operational sections this specification implied. Exposure absolute maximum ratings extended periods time affect device reliability.
Model ADM9261ARM ADM9261ARM-REEL ADM9261ARM-REEL7
NOTES Thin Small Outline 2500 devices reel. 1000 devices reel.
Temperature Range 40°C +85°C 40°C +85°C 40°C +85°C
Package Option RM-8 RM-8 RM-8
CAUTION (electrostatic discharge) sensitive device. Electrostatic charges high 4000 readily accumulate human body test equipment discharge without detection. Although ADM9261 features proprietary protection circuitry, permanent damage occur devices subjected high energy electrostatic discharges. Therefore, proper precautions recommended avoid performance degradation loss functionality.
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ADM9261
CONFIGURATION
VIEW (Not Scale)
ERR1
ADM9261
ERR2 ERR3
FUNCTION DESCRIPTIONS
Mnemonic
Function Ground. Supply Monitored. battery supply comparator trips when supply voltage falls below Supply Monitored. supply comparator trips when supply voltage falls below Supply Monitored. supply. comparator trips when supply voltage falls below Supply Monitor Power Supply. powered from power supply between including supplies being monitored (except SU1). Open Drain Output. when below minimum value. Otherwise pulls high through resistor positive supply. Open Drain Output. when below minimum value. Otherwise pulls high through resistor positive supply. Open Drain Output. when below minimum value. Otherwise pulls high through resistor positive supply.
ERR3
external
ERR2
external
ERR1
external
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ADM9261
CIRCUIT INFORMATION Monitor Inputs
ADM9621 provided with three analog inputs, SU3, monitor supply voltages +3.3 supplies. Each input connected voltage comparator whose trip point on-chip voltage reference on-chip precision thin-film resistors. Onchip attenuators reduce input voltage comparators, that voltages greater than supply voltage monitored without need external resistors. ADM9261 intended battery-powered systems, input attenuators high resistance minimise current drawn from supplies. This, coupled with lowpwer design comparators themselves, gives typical current consumption 10µA, including input currents SU3.
Error Outputs
logic outputs open-drain take their output high level from voltage connected pull-up resistor. They will normally connected VCC, connected voltage different logic swing required.
Error outputs ERR1 ERR3 open-drain outputs that when corresponding supply voltage greater than minimum value when corresponding supply voltage falls below minimum value. Each output requires pullup resistor positive supply, which normally system logic supply, different required. open-drain construction allows more these outputs wire ANDed together required, shown figure
10kW ERR1
ERR2
ERR3
OUTPUT
Truth Table Wired
Output
Power Supply
ADM9261 powered from supply voltage between This includes supply voltages apart from that connected SU1, since this greater than will usually powered from supplies.
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ADM9261
APPLICATIONS
ADM9261 designed pagers other portable devices that 3.3V logic systems derived from battery. Interfacing ADM9261 system will vary with application, microcontroller used, outputs ADM9261 connected more lines. microprocessor used with separate ASIC other chip then ADM9261
interfaced this. either case ADM9261 very simple use. Inputs simply connected supplies monitored outputs connected devices logic system, either separately single input using wired AND. ADM9261 will derive power supply from 3.3V supplies. Figure shows typical application ADM9261.
10kW ERR1 10kW ERR2 10kW ERR3 PAGER ASIC MICROPROCESSOR
3.3V
ADM9261
3.3V
Figure Typical Application ADM9261
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ADM9261
Dimensions shown inches (mm).
OUTLINE DIMENSIONS 8-Lead Micro SOIC (R-8A)
0.122 (3.10) 0.114 (2.90)
0.122 (3.10) 0.114 (2.90)
0.199 (5.05) 0.187 (4.75)
0.0256 (0.65) 0.120 (3.05) 0.112 (2.84) 0.006 (0.15) 0.002 (0.05) 0.043 (1.09) 0.037 (0.94) 0.011 (0.28) 0.003 (0.08) 0.120 (3.05) 0.112 (2.84)
0.018 (0.46) SEATING 0.008 (0.20) PLANE
0.028 (0.71) 0.016 (0.41)
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