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ADM803 Schematic ( PDF Datasheet ) - Analog Devices

Teilenummer ADM803
Beschreibung Microprocessor Supervisory Circuits
Hersteller Analog Devices
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Gesamt 11 Seiten
ADM803 Datasheet, Funktion
Data Sheet
Microprocessor Supervisory Circuits
in 3-Lead SC70 and SOT-23
ADM803/ADM809/ADM810
FEATURES
Specified over temperature
Low power consumption: 17 μA
Precision voltage monitor: 2.5 V, 3 V, 3.3 V, 5 V options
Reset assertion down to 1 V VCC
140 ms minimum 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
GENERAL DESCRIPTION
The ADM803/ADM809/ADM810 supervisory circuits monitor
the power supply voltage in microprocessor systems. They
provide 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 ADM803 and
ADM809 provide an active low reset signal (RESET), whereas
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.
FUNCTIONAL BLOCK DIAGRAMS
ADM803
VCC
VREF
RESET
GENERATOR
240ms
RESET
GND
ADM809/ADM810
VCC
VREF
RESET
GENERATOR
240ms
RESET
(RESET)
VCC
GND
VCC
ADM803/ADM809
RESET
GND
*RPULL-UP
VCC
MICROPROCESSOR
SYSTEM
RESET
INPUT
GND
*ADM803 ONLY
Figure 1.
Seven reset threshold voltage options are available, suitable for
monitoring a variety of supply voltages (see Table 3).
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
them suitable for low power, portable equipment. The ADM803
is available in a 3-lead SC70; the ADM809/ADM810 are available
in 3-lead SOT-23 and 3-lead SC70 packages.
Rev. I
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Tel: 781.329.4700 ©1997–2014 Analog Devices, Inc. All rights reserved.
Technical Support
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ADM803 Datasheet, Funktion
ADM803/ADM809/ADM810
TYPICAL PERFORMANCE CHARACTERISTICS
30
VCC = 5V
25
20
VCC = 3V
15
10
5
0
–40 –20
0
20 40 60 80 85
TEMPERATURE (°C)
Figure 5. Supply Current vs. Temperature (No Load)
200
VOD = VTH – VCC
180
VOD = 10mV
160
140
120
VOD = 20mV
100
80
60
40 VOD = 100mV
20
0
–40
–20
VOD = 200mV
0 20 40
TEMPERATURE (°C)
60
80 85
Figure 6. Power-Down Reset Delay vs. Temperature, ADM8xxL/M/J
180
VOD = VTH – VCC
160
VOD = 10mV
140
120
100 VOD = 20mV
80
60
40
VOD = 100mV
20
0
–40
–20
VOD = 200mV
0 20 40
TEMPERATURE (°C)
60
80 85
Figure 7. Power-Down Reset Delay vs. Temperature, ADM8xxT/S/R/Z
Data Sheet
240.0
239.5
239.0
238.5
238.0
237.5
237.0
236.5
236.0
235.5
235.0
–40 –20
0
20
40 60 80 85
TEMPERATURE (°C)
Figure 8. Power-Up Reset Timeout vs. Temperature, ADM8xxR
1.0020
1.0015
1.0010
1.0005
1.0000
0.9995
0.9990
–40 –20
0
20
40 60 80 85
TEMPERATURE (°C)
Figure 9. Normalized Reset Voltage Threshold vs. Temperature
SUPPLY VOLTAGE
5V p-p
T
1
2T
RESET OUTPUT
VOLTAGE
ADM809T
ADM809R
CH1 2.00V CH2 2.00V M 200ms CH1
2.00V
Figure 10. Reset Output Voltage vs. Supply Voltage
Rev. I | Page 6 of 11

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