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Microprocessor Supervisory Circuits in 3-Lead SC70 and SOT-23
REV.C
Microprocessor Supervisory Circuits
in 3-Lead SC70 and SOT-23
FEATURES
Specified over Temperature
Low Power Consumption (17 �A)
Precision Voltage Monitor: 2.5 V, 3 V, 3.3 V, 5 V Options
Reset Assertion Down to 1 V VCC
140 ms Min Power-On Reset
Open-Drain RESET Output (ADM803)
Push-Pull RESET Output (ADM809)
Push-Pull RESET Output (ADM810)
SC70 and SOT-23 Packages
APPLICATIONS
Microprocessor Systems
Computers
Controllers
Intelligent Instruments
Automotive Systems
FUNCTIONAL BLOCK DIAGRAMFigure 1.Typical Operating Circuit
GENERAL DESCRIPTIONThe ADM803/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 opera-
tional with VCC as low as 1 V. The ADM803 and ADM809
provide an active low reset signal (RESET), while the ADM810
provides an active high signal (RESET) output. The ADM809
and ADM810 have push-pull outputs whereas the ADM803 has
an open-drain output, which requires an external pull-up resistor.
Seven 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 ADM803/ADM809/ADM810 consume only 17 µA, making
it suitable for low power portable equipment. The ADM803 is
available in a 3-lead SC70; the ADM809/ADM810 is available
in 3-lead SOT-23 and SC70 packages.
ADM803/ADM809/ADM810–SPECIFICATIONS (VCC = full operating range, TA = TMIN to TMAX,
VCC Typ = 5 V for L/M/J models, 3.3 V for T/S models, 3 V for R models, 2.5 V for Z models, unless otherwise noted.)RESET OUTPUT VOLTAGE LOW
(ADM810)
RESET OUTPUT VOLTAGE HIGH
(ADM810)
PIN CONFIGURATIONABSOLUTE 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
�JA Thermal Impedance, SC70 . . . . . . . . . . . . . . . . . 146°C/W
�JA Thermal Impedance, SOT-23 . . . . . . . . . . . . . . . 270°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.
PIN CONFIGURATIONFigure 2.Power Fail Reset Timing
Table I.Reset Threshold OptionsADM8_T
ADM8_S
ADM8_R
*ADM809/ADM810 only.
PIN FUNCTION DESCRIPTIONS3VCC
CAUTIONESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000V readily
accumulate on the human body and test equipment and can discharge without detection. Although the
ADM803/ADM809/ADM810 feature proprietary ESD protection circuitry, permanent damage may
occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD precautions
are recommended to avoid performance degradation or loss of functionality.
ADM803/ADM809/ADM810
ORDERING GUIDE (ADM803 and ADM809)
ORDERING GUIDE (ADM810)
ADM803/ADM809/ADM810–Typical Performance CharacteristicsTPC 1.Supply Current vs. Temperature (No Load)
TPC 2.Power-Down RESET Delay vs. Temperature
ADM8_L/M/J
TPC 3.Power-Down RESET Delay vs. Temperature
ADM8_T/S/R/Z
TPC 4.Power-Down RESET Delay vs. Temperature
ADM8_R
TPC 5.Normalized RESET Voltage Threshold vs.
Temperature
TPC 6.RESET Output Voltage vs. Supply Voltage
