Analog Devices ADM810, ADM809 Datasheet
Microprocessor
a
Supervisory Circuit in 3-Pin SOT-23
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 V
CC
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 DESCRIPTION
The 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 V
as low as 1 V. The
CC
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 V
CC
.
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.
ADM809/ADM810
FUNCTIONAL BLOCK DIAGRAM
ADM809/ADM810
V
CC
V
REF
V
CC
V
CC
ADM809
GND GND
Figure 1. Typical Operating Circuit
RESET
GENERATOR
GND
RESET
240ms
RESET
INPUT
V
CC
µP
SYSTEM
RESET
(RESET)
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Fax: 617/326-8703 © Analog Devices, Inc., 1997
ADM809/ADM810–SPECIFICATIONS
WARNING!
ESD SENSITIVE DEVICE
(VCC = Full Operating Range, TA = T
for T/S, 3 V for R Models unless otherwise noted.)
MIN
to T
, VCC typ = 5 V for L/M/J, 3.3 V
MAX
Parameter Min Typ Max Units Test Conditions/Comments
Operating Voltage Range 1.0 5.5 V T
V
CC
1.2 5.5 V T
Supply Current 24 60 µAV
17 50 µAV
100 µAV
100 µAV
= 0°C to +70°C
A
= –40°C to +105°C
A
< 5.5 V, ADM8_L/M, T
CC
< 3.6 V, ADM8_R/S/T, T
CC
< 5.5 V, ADM8_L/M, T
CC
< 3.6 V, ADM8_R/S/T, T
CC
RESET THRESHOLD
Reset Voltage Threshold
ADM8_L 4.56 4.63 4.70 V T
ADM8_L 4.5 4.75 V T
ADM8_L 4.40 4.86 V T
ADM8_M 4.31 4.38 4.45 V T
ADM8_M 4.25 4.5 V T
ADM8_M 4.16 4.56 V T
ADM8_␣ J 3.93 4.00 4.06 V T
ADM8_ J 3.89 4.10 V T
ADM8_ J 3.80 4.20 V T
ADM8_T 3.04 3.08 3.11 V T
ADM8_T 3.00 3.15 V T
ADM8_T 2.92 3.23 V T
ADM8_S 2.89 2.93 2.96 V T
ADM8_S 2.85 3.00 V T
ADM8_S 2.78 3.08 V T
ADM8_R 2.59 2.63 2.66 V T
ADM8_R 2.55 2.70 V T
ADM8_R 2.50 2.76 V T
= +25°C
A
= –40°C to +85°C
A
= +85°C to +105°C
A
= +25°C
A
= –40°C to +85°C
A
= +85°C to +105°C
A
= +25°C
A
= –40°C to +85°C
A
= +85°C to +105°C
A
= +25°C
A
= –40°C to +85°C
A
= +85°C to +105°C
A
= +25°C
A
= –40°C to +85°C
A
= +85°C to +105°C
A
= +25°C
A
= –40°C to +85°C
A
= +85°C to +105°C
A
Reset Threshold Temperature Coefficient 30 ppm/°C
V
to Reset Delay 20 µsV
CC
Reset Active Timeout Period 140 240 560 ms T
100 840 ms T
= VTH to (VTH –100 mV)
CC
= –40°C to +85°C
A
= +85°C to +105°C
A
RESET Output Voltage Low (ADM809) 0.3 V VCC = VTH min, I
RESET Output Voltage High (ADM809) 0.8 V
CC
0.4 V V
0.3 V VCC >1.0 V, I
VV
= VTH min, I
CC
> VTH max, I
CC
SINK
VCC–1.5 V VCC > VTH max, I
RESET Output Voltage Low (ADM810) 0.3 V V
= VTH min, I
CC
0.4 V VCC = VTH min, I
RESET Output Voltage High (ADM810) 0.8 V
CC
V 1.8 V < VCC < VTH min, I
= –40°C to +85°C
A
= –40°C to +85°C
A
= +85°C to +105°C
A
= +85°C to +105°C
A
= 1.2 mA, ADM809R/S/T
SINK
= 3.2 mA, ADM809L/M
SINK
= 50 µA
= 500 µA, ADM809R/S/T
SOURCE
= 800 µA, ADM809L/M
SOURCE
= 1.2 mA, ADM810R/S/T
SINK
= 3.2 mA, ADM810L/M
SINK
= 150 µA
SOURCE
ABSOLUTE MAXIMUM RATINGS*
(T
= +25°C unless otherwise noted)
A
VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to +6 V
RESET, RESET . . . . . . . . . . . . . . . . . . –0.3 V to Vcc + 0.5 V
Input Current
V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 mA
CC
Output Current
RESET, RESET . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 mA
Rate of Rise, V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 100 V/µs
CC
Power Dissipation, RT-3 SOT-23 . . . . . . . . . . . . . . . . 320 mW
Derate by 4 mW/°C above +70°C
Thermal Impedance . . . . . . . . . . . . . . . . . . . . . . . 333°C/W
θ
JA
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.
CAUTION
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily
accumulate on the human body and test equipment and can discharge without detection.
Although the ADM809/ADM810 features 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.
–2–
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