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ADM809JART-ADM809LART-ADM809MART-ADM809SART-ADM809TART-ADM810SART
Microprocessor Supervisory Circuit in 3-Pin SOT-23
REV.0
Microprocessor
Supervisory Circuit in 3-Pin SOT-23
FUNCTIONAL BLOCK DIAGRAM
VCC
RESET
(RESET)
GND
FEATURES
Superior Upgrade for MAX809/MAX810
Specified Over Temperature
Low Power Consumption (17 mA)
Precision Voltage Monitor: +3 V, +3.3 V, +5 V Options
Reset Assertion Down to 1 V VCC
140 ms min Power-On Reset
Logic Low RESET Output (ADM809)
Logic High RESET Output (ADM810)
APPLICATIONS
Microprocessor Systems
Computers
Controllers
Intelligent Instruments
Automotive Systems
GENERAL DESCRIPTIONThe ADM809/ADM810 supervisory circuits monitor the
power supply voltage in microprocessor systems. They pro-
vide a reset output during power-up, power-down and
brownout conditions. On power-up, an internal timer holds
reset asserted for 240 ms. This holds the microprocessor in a
reset state until conditions have stabilized. The RESET
output remains operational with VCC as low as 1 V. The
ADM809 provides an active low reset signal (RESET) while
the ADM810 provides an active high signal (RESET) output.
Six reset threshold voltage options are available suitable for
monitoring a variety of supply voltages. Refer to Table I.
The reset comparator features built-in glitch immunity,
making it immune to fast transients on VCC.
The ADM809/ADM810 consumes only 17 μA, making it
suitable for low power portable equipment. It is packaged in
a 3-pin SOT-23 package.
VCCFigure 1.Typical Operating Circuit
ADM809/ADM810–SPECIFICATIONS
(VCC = Full Operating Range, TA = TMIN to TMAX, VCC typ = 5 V for L/M/J, 3.3 V
for T/S, 3 V for R Models unless otherwise noted.)
ABSOLUTE MAXIMUM RATINGS*(TA = +25°C unless otherwise noted)
VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .–0.3 V to +6 V
RESET, RESET . . . . . . . . . . . . . . . . . .–0.3 V to Vcc + 0.5 V
Input Current
VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20 mA
Output Current
RESET, RESET . . . . . . . . . . . . . . . . . . . . . . . . . . . .20 mA
Rate of Rise, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . .100 V/μs
Power Dissipation, RT-3 SOT-23 . . . . . . . . . . . . . . . .320 mW
Derate by 4 mW/°C above +70°C
θJA Thermal Impedance . . . . . . . . . . . . . . . . . . . . . . .333°C/W
Lead Temperature (Soldering, 10 sec) . . . . . . . . . . . .+300°C
Vapor Phase (60 sec) . . . . . . . . . . . . . . . . . . . . . . . .+215°C
Infrared (15 sec) . . . . . . . . . . . . . . . . . . . . . . . . . . . .+220°C
Storage Temperature Range . . . . . . . . . . . . .–65°C to +150°C
*Stresses above those listed under Absolute Maximum Ratings may cause perma-
nent damage to the device. This is a stress rating only; functional operation of the
device at these or any other conditions above those listed in the operational sections
of this specification is not implied. Exposure to absolute maximum ratings for
extended periods of time may affect device reliability.
CAUTIONESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000V readily
PIN FUNCTION DESCRIPTION
PIN CONFIGURATION
VCC
RESET
t1 = RESET TIME = 240ms TYP.
VREF = RESET VOLTAGE THRESHOLDFigure 2.Power Fail Reset Timing
Table I.Reset Threshold Options
ORDERING GUIDE
ADM809/ADM810
TEMPERATURE – C–40–20020406080Figure 3.Supply Current vs. Tem-
perature (ADM8_L/M/R/S/T) (No Load)
TEMPERATURE – C
240Figure 6.Power-Down RESET Delay
vs. Temperature ADM8_R
—Typical Performance Characteristics
TEMPERATURE – C–40–20020406080
200Figure 4.Power-Down RESET Delay
vs. Temperature ADM8_L/M
TEMPERATURE – C
0.9995Figure 7.Normalized RESET Voltage
Threshold vs. Temperature
RESET COMPARATOR OVERDRIVE, VTH – VCC (mV)Figure 9.Maximum Transient Dura-
tion Without Causing a RESET Pulse
vs. RESET Comparator Overdrive
TEMPERATURE – C–40–20020406080
180Figure 5.Power-Down RESET Delay
vs. Temperature ADM8_T/S/R
1
CH12.00V2.00VM 200msCH12.00VFigure 8.RESET Output Voltage vs.
Supply Voltage
INTERFACING TO OTHER DEVICES OUTPUTThe ADM809/ADM810 Series is designed to integrate with as
many devices as possible and therefore has a standard output
dependant on VCC. This enables the part to be used in both 3 V
and 5 V or any nominal voltage within the minimum and maxi-
mum specifications for VCC. Because of this design approach,
interfacing this device to other devices is simplified.
ENSURING A VALID RESET OUTPUT DOWN TO VCC = 0 VWhen VCC falls below 0.8 V, ADM809’s RESET no longer
sinks current. A high impedance CMOS logic input connected
to RESET may, therefore, drift to undetermined logic levels. To
eliminate this problem a 100 kΩ resistor should be connected
from RESET to ground.
VCCFigure 10.Ensuring a Valid RESET Output Down to
VCC = 0 V
THE BENEFITS OF A VERY ACCURATE RESET
THRESHOLDIn other microprocessor supervisory circuits, tolerances in sup-
ply voltages lead to an overall increase in RESET tolerance
levels due to the deterioration of the microprocessor RESET
circuit’s power supply. The possibility of a malfunction during
a power failure is greatly reduced because the ADM809 and
ADM810 series can operate effectively even when there are
large degradations of the supply voltages. Another advantage of
the ADM809 and ADM810 series is its very accurate internal
voltage reference circuit. These benefits combine to produce an
exceptionally reliable Voltage Monitor Circuit.
INTERFACING TO MICROPROCESSORS WITH
MULTIPLE INTERRUPTSIn a number of cases it is necessary to interface many interrupts
from different devices (i.e., thermal, attitude and velocity sen-
sors). The ADM809 and ADM810 can easily be integrated into
existing interrupt-handling circuits (Figure 11) or used as a
stand-alone device.
4 LINE BCD
TO mP
VCCFigure 11.Interfacing to μPs with Multiple Interrupts
ADM809/ADM810
OUTLINE DIMENSIONSDimensions shown in inches and (mm).
C3047–12–4/97
PRINTED IN U.S.A.
Surface Mount Package
RT-3
0.1200 (3.048)
0.1102 (2.799)
PIN 1
0.0550 (1.397)
0.0470 (1.194)
0.0236 (0.599)
0.0177 (0.450)
0.1040 (2.642)
0.0827 (2.101)
0.0413 (1.049)
0.0374 (0.950)
0.0701 (1.781)
SEATING
PLANE
0.0440 (1.118)
0.0320 (0.813)0.0040 (0.102)
0.0005 (0.013)
0.0210 (0.533)
0.0146 (0.371)
0.027 (0.686)
REF
0.0059 (0.150)
0.0034 (0.086)
0.0100 (0.254)
0.0050 (0.127)
