Analog Devices ADM810SART-REEL-7, ADM810SART-REEL, ADM810RART-REEL7, ADM810MART-REEL-7, ADM810LART-REEL-7 Datasheet
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a
ADM809/ADM810
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700 World Wide Web Site: http://www.analog.com
Fax: 617/326-8703 © Analog Devices, Inc., 1997
Microprocessor
Supervisory Circuit in 3-Pin SOT-23
FUNCTIONAL BLOCK DIAGRAM
V
REF
V
CC
RESET
GENERATOR
240ms
ADM809/ADM810
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 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
CC
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 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.
RESET
RESET
INPUT
GND GND
V
CC
V
CC
µP
SYSTEM
ADM809
V
CC
Figure 1. Typical Operating Circuit
–2–
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ADM809/ADM810–SPECIFICATIONS
Parameter Min Typ Max Units Test Conditions/Comments
V
CC
Operating Voltage Range 1.0 5.5 V T
A
= 0°C to +70°C
1.2 5.5 V T
A
= –40°C to +105°C
Supply Current 24 60 µAV
CC
< 5.5 V, ADM8_L/M, T
A
= –40°C to +85°C
17 50 µAV
CC
< 3.6 V, ADM8_R/S/T, T
A
= –40°C to +85°C
100 µAV
CC
< 5.5 V, ADM8_L/M, T
A
= +85°C to +105°C
100 µAV
CC
< 3.6 V, ADM8_R/S/T, T
A
= +85°C to +105°C
RESET THRESHOLD
Reset Voltage Threshold
ADM8_L 4.56 4.63 4.70 V T
A
= +25°C
ADM8_L 4.5 4.75 V T
A
= –40°C to +85°C
ADM8_L 4.40 4.86 V T
A
= +85°C to +105°C
ADM8_M 4.31 4.38 4.45 V T
A
= +25°C
ADM8_M 4.25 4.5 V T
A
= –40°C to +85°C
ADM8_M 4.16 4.56 V T
A
= +85°C to +105°C
ADM8_␣ J 3.93 4.00 4.06 V T
A
= +25°C
ADM8_ J 3.89 4.10 V T
A
= –40°C to +85°C
ADM8_ J 3.80 4.20 V T
A
= +85°C to +105°C
ADM8_T 3.04 3.08 3.11 V T
A
= +25°C
ADM8_T 3.00 3.15 V T
A
= –40°C to +85°C
ADM8_T 2.92 3.23 V T
A
= +85°C to +105°C
ADM8_S 2.89 2.93 2.96 V T
A
= +25°C
ADM8_S 2.85 3.00 V T
A
= –40°C to +85°C
ADM8_S 2.78 3.08 V T
A
= +85°C to +105°C
ADM8_R 2.59 2.63 2.66 V T
A
= +25°C
ADM8_R 2.55 2.70 V T
A
= –40°C to +85°C
ADM8_R 2.50 2.76 V T
A
= +85°C to +105°C
Reset Threshold Temperature Coefficient 30 ppm/°C
V
CC
to Reset Delay 20 µsV
CC
= VTH to (VTH –100 mV)
Reset Active Timeout Period 140 240 560 ms T
A
= –40°C to +85°C
100 840 ms T
A
= +85°C to +105°C
RESET Output Voltage Low (ADM809) 0.3 V VCC = VTH min, I
SINK
= 1.2 mA, ADM809R/S/T
0.4 V V
CC
= VTH min, I
SINK
= 3.2 mA, ADM809L/M
0.3 V VCC >1.0 V, I
SINK
= 50 µA
RESET Output Voltage High (ADM809) 0.8 V
CC
VV
CC
> VTH max, I
SOURCE
= 500 µA, ADM809R/S/T
VCC–1.5 V VCC > VTH max, I
SOURCE
= 800 µA, ADM809L/M
RESET Output Voltage Low (ADM810) 0.3 V V
CC
= VTH min, I
SINK
= 1.2 mA, ADM810R/S/T
0.4 V VCC = VTH min, I
SINK
= 3.2 mA, ADM810L/M
RESET Output Voltage High (ADM810) 0.8 V
CC
V 1.8 V < VCC < VTH min, I
SOURCE
= 150 µA
(VCC = Full Operating Range, TA = T
MIN
to T
MAX
, 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*
(T
A
= +25°C unless otherwise noted)
VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to +6 V
RESET, RESET . . . . . . . . . . . . . . . . . . –0.3 V to Vcc + 0.5 V
Input Current
V
CC
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 mA
Output Current
RESET, RESET . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 mA
Rate of Rise, V
CC
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 100 V/µs
Power Dissipation, RT-3 SOT-23 . . . . . . . . . . . . . . . . 320 mW
Derate by 4 mW/°C above +70°C
θ
JA
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.
WARNING!
ESD SENSITIVE DEVICE
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.
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