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ADM803 9 10 e
Datasheet
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Analog Devices ADM803 9 10 e Datasheet

Microprocessor Supervisory Circuits
RESET
RESET
INPUT
GND GND
V
CC
V
CC
MICROPROCESSOR
SYSTEM
ADM803 / ADM809
V
CC
*R
PULL-UP
*ADM803 ONLY
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 V
CC
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

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 opera- tional with V
as low as 1 V. The ADM803 and ADM809
CC
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 V
CC
.
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 is available in 3-lead SOT-23 and SC70 packages.

FUNCTIONAL BLOCK DIAGRAM

ADM803
V
CC
V
REF
ADM809 / ADM810
V
CC
V
REF
RESET
GENERATOR
240ms
GND
RESET
GENERATOR
240ms
GND
Figure 1. Typical Operating Circuit
RESET
RESET
(RESET)
REV. E
Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781/329-4700 www.analog.com Fax: 781/326-8703 © 2005 Analog Devices, Inc. All rights reserved.
ADM803/ADM809/ADM810–SPECIFICATIONS
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.)
V
CC
(VCC = full operating range, TA = T
MIN
to T
Parameter Min Typ Max Unit Test Conditions/Comments
VCC OPERATING VOLTAGE RANGE 1.0 5.5 V TA = 0°C to 70°C
1.2 5.5 V T
Supply Current 24 35 µAV
17 30 µAV
60 µAV
60 µAV
= –40°C to +125°C
A
< 5.5 V, ADM8_L/M/J,
CC
T
= –40°C to +85°C
A
< 3.6 V, ADM8_R/S/T/Z,
CC
T
= –40°C to +85°C
A
< 5.5 V, ADM8_L/M/J,
CC
T
= 85°C to 125°C
A
< 3.6 V, ADM8_R/S/T/Z,
CC
TA = 85°C to 125°C
RESET THRESHOLD
Reset Voltage Threshold
ADM8_L 4.56 4.63 4.70 V T ADM8_L 4.50 4.75 V T ADM8_L 4.44 4.82 V T ADM8_M 4.31 4.38 4.45 V T ADM8_M 4.25 4.50 V T ADM8_M 4.20 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 2.95 3.21 V T ADM8_S 2.89 2.93 2.96 V T ADM8_S 2.85 3.00 V T ADM8_S 2.81 3.05 V T ADM8_R 2.59 2.63 2.66 V T ADM8_R 2.55 2.70 V T ADM8_R 2.52 2.74 V T ADM8_Z 2.28 2.32 2.35 V T ADM8_Z 2.25 2.38 V T
= 25°C
A
= –40°C to +85°C
A
= –40°C to +125°C
A
= 25°C
A
= –40°C to +85°C
A
= –40°C to +125°C
A
= 25°C
A
= –40°C to +85°C
A
= –40°C to +125°C
A
= 25°C
A
= –40°C to +85°C
A
= –40°C to +125°C
A
= 25°C
A
= –40°C to +85°C
A
= –40°C to +125°C
A
= 25°C
A
= –40°C to +85°C
A
= –40°C to +125°C
A
= 25°C
A
= –40°C to +85°C
A
ADM8_Z 2.22 2.42 V TA = –40°C to +125°C
RESET THRESHOLD TEMPERATURE COEFFICIENT 30 ppm/°C
VCC to Reset Delay 20 µsV
= VTH to (VTH – 100 mV)
CC
RESET ACTIVE TIMEOUT PERIOD 140 240 460 ms TA = –40°C to +85°C
100 840 ms TA = 85°C to 125°C
RESET OUTPUT VOLTAGE LOW 0.3 V VCC = VTH min, I
= 1.2 mA,
SINK
(ADM803/ADM809) ADM803R/S/T/Z, ADM809R/S/T/Z
0.4 V V
= VTH min, I
CC
= 3.2 mA,
SINK
ADM803L/M/J, ADM809L/M/J
RESET OUTPUT VOLTAGE HIGH 0.8 V
CC
0.3 V VCC >1.0 V, I
VV
> VTH max, I
CC
SINK
= 50 µA
SOURCE
= 500 µA,
(ADM809) ADM809R/S/T/Z
V
– 1.5 V VCC > VTH max, I
CC
SOURCE
= 800 µA,
ADM809L/M/J
RESET OUTPUT VOLTAGE LOW (ADM810) 0.3 V V
= VTH min, I
CC
= 1.2 mA,
SINK
ADM810R/S/T/Z
0.4 V V
= VTH min, I
CC
= 3.2 mA,
SINK
ADM810L/M/J
RESET OUTPUT VOLTAGE HIGH (ADM810) 0.8 V
CC
V 1.8 V < VCC < VTH min,
I
= 150 µA
SOURCE
RESET OPEN-DRAIN OUTPUT
Leakage Current (ADM803) 1 µAV
*ADM809/ADM810 only.
> VTH, reset de-asserted
CC
MAX
,
–2–
REV. E
(TA = 25°C, unless otherwise noted.)
V
CC
RESET
t1 t1
V
REF
V
REF
V
REF
V
REF
t1 = RESET TIME = 240ms TYP
V
REF
= RESET VOLTAGE THRESHOLD
VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to +6 V
RESET, RESET . . . . . . . . . . . . . . . . . . –0.3 V to V
+ 0.5 V
CC
Input Current
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 mA
V
CC
Output Current
RESET, RESET . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 mA
Rate of Rise, V
Thermal Impedance, SC70 . . . . . . . . . . . . . . . . . 146°C/W
␪
JA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 100 V/µs
CC
␪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.
Table I. Reset Threshold Options
RESET Model Threshold (V)
ADM8_L 4.63 ADM8_M 4.38 ADM8_J* 4.00 ADM8_T 3.08 ADM8_S 2.93 ADM8_R 2.63 ADM8_Z 2.32
*ADM809/ADM810 only.
ADM803/ADM809/ADM810

PIN CONFIGURATIONABSOLUTE MAXIMUM RATINGS*

PIN CONFIGURATION

ADM803/
1
GND
ADM809/ ADM810
TOP VIEW
(Not to Scale)
RESET, RESET
2

PIN FUNCTION DESCRIPTIONS

Pin No. Mnemonic Function
1GND 0 V. Ground reference for all
signals.
2 RESET (ADM803/ Active Low Logic Output.
ADM809) RESET remains low while V
is below the reset threshold and remains low for 240 ms (typ) after V threshold.
2 RESET (ADM810) Active High Logic Output.
RESET remains high while V is below the reset threshold and remains high for 240 ms (typ) after V threshold.
3V
CC
Supply Voltage Being Monitored.
3
V
CC
rises above the reset
CC
rises above the reset
CC
CC
CC
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 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.
REV. E
Figure 2. Power Fail Reset Timing
–3–
ADM803/ADM809/ADM810

ORDERING GUIDE (ADM803 and ADM809)

Model Reset Threshold (V) Temperature Range Branding Quantity Package Type
ADM803LAKS-REEL 4.63 –40°C to +125°CM02 10k 3-Lead SC70 ADM803LAKS-REEL7 4.63 –40°C to +125°CM02 3k 3-Lead SC70 ADM803MAKS-REEL 4.38 –40°C to +125°CM03 10k 3-Lead SC70 ADM803MAKS-REEL7 4.38 –40°C to +125°CM03 3k 3-Lead SC70 ADM803RAKS-REEL 2.63 –40°C to +125°CM07 10k 3-Lead SC70 ADM803RAKS-REEL7 2.63 –40°C to +125°CM07 3k 3-Lead SC70 ADM803SAKS-REEL 2.93 –40°C to +125°CM06 10k 3-Lead SC70 ADM803SAKS-REEL7 2.93 –40°C to +125°CM06 3k 3-Lead SC70 ADM803TAKS-REEL 3.08 –40°C to +125°CM05 10k 3-Lead SC70 ADM803TAKS-REEL7 3.08 –40°C to +125°CM05 3k 3-Lead SC70 ADM803TAKSZ-REEL* 3.08 –40°C to +125°CM4M 10k 3-Lead SC70 ADM803TAKSZ-REEL7* 3.08 –40°C to +125°CM4M 3k 3-Lead SC70 ADM803ZAKS-REEL 2.32 –40°C to +125°CM08 10k 3-Lead SC70 ADM803ZAKS-REEL7 2.32 –40°C to +125°CM08 3 k 3-Lead SC70
ADM809JAKS-REEL 4.00 –40°C to +125°C M9C 10k 3-Lead SC70 ADM809JAKS-REEL7 4.00 –40°C to +125°C M9C 3k 3-Lead SC70 ADM809JART-REEL 4.00 –40°C to +125°C9JXX 10k 3-Lead SOT-23 ADM809JART-REEL7 4.00 –40°C to +125°C9JXX 3k 3-Lead SOT-23 ADM809LAKS-REEL 4.63 –40°C to +125°C M9A 10k 3-Lead SC70 ADM809LAKS-REEL7 4.63 –40°C to +125°C M9A 3k 3-Lead SC70 ADM809LART-REEL 4.63 –40°C to +125°C 9LXX 10k 3-Lead SOT-23 ADM809LART-REEL7 4.63 –40°C to +125°C 9LXX 3k 3-Lead SOT-23 ADM809LARTZ-REEL* 4.63 –40°C to +125°C 9LXX# 10k 3-Lead SOT-23 ADM809LARTZ-REEL7* 4.63 –40°C to +125°C 9LXX# 3k 3-Lead SOT-23 ADM809MAKS-REEL 4.38 –40°C to +125°CM9B 10k 3-Lead SC70 ADM809MAKS-REEL7 4.38 –40°C to +125°CM9B 3k 3-Lead SC70 ADM809MART-REEL 4.38 –40°C to +125°C 9MXX 10k 3-Lead SOT-23 ADM809MART-REEL7 4.38 –40°C to +125°C 9MXX 3k 3-Lead SOT-23 ADM809MARTZ-REEL* 4.38 –40°C to +125°C 9MXX# 10k 3-Lead SOT-23 ADM809MARTZ-REEL7* 4.38 –40°C to +125°C 9MXX# 3k 3-Lead SOT-23 ADM809RAKS-REEL 2.63 –40°C to +125°C M9F 10k 3-Lead SC70 ADM809RAKS-REEL7 2.63 –40°C to +125°C M9F 3k 3-Lead SC70 ADM809RAKSZ-REEL* 2.63 –40°C to +125°C M9F 10k 3-Lead SC70 ADM809RAKSZ-REEL7* 2.63 –40°C to +125°C M9F 3k 3-Lead SC70 ADM809RART-REEL 2.63 –40°C to +125°C 9RXX 10k 3-Lead SOT-23 ADM809RART-REEL7 2.63 –40°C to +125°C 9RXX 3k 3-Lead SOT-23 ADM809RARTZ-REEL* 2.63 –40°C to +125°C M4D 10k 3-Lead SOT-23 ADM809RARTZ-REEL7* 2.63 –40°C to +125°C M4D 3k 3-Lead SOT-23 ADM809SAKS-REEL 2.93 –40°C to +125°C M9E 10k 3-Lead SC70 ADM809SAKS-REEL7 2.93 –40°C to +125°C M9E 3k 3-Lead SC70 ADM809SART-REEL 2.93 –40°C to +125°C 9SXX 10k 3-Lead SOT-23 ADM809SART-REEL7 2.93 –40°C to +125°C 9SXX 3k 3-Lead SOT-23 ADM809SARTZ-REEL* 2.93 –40°C to +125°C 9SXX# 10k 3-Lead SOT-23 ADM809SARTZ-REEL7* 2.93 –40°C to +125°C 9SXX# 3k 3-Lead SOT-23 ADM809TAKS-REEL 3.08 –40°C to +125°C M9D 10k 3-Lead SC70 ADM809TAKS-REEL7 3.08 –40°C to +125°C M9D 3k 3-Lead SC70 ADM809TAKSZ-REEL* 3.08 –40°C to +125°C M9D# 10k 3-Lead SC70 ADM809TAKSZ-REEL7* 3.08 –40°C to +125°C M9D# 3k 3-Lead SC70 ADM809TART-REEL 3.08 –40°C to +125°C 9TXX 10k 3-Lead SOT-23 ADM809TART-REEL7 3.08 –40°C to +125°C 9TXX 3k 3-Lead SOT-23 ADM809TARTZ-REEL* 3.08 –40°C to +125°CM4K 10k 3-Lead SOT-23 ADM809TARTZ-REEL7* 3.08 –40°C to +125°CM4K 3k 3-Lead SOT-23 ADM809ZAKS-REEL 2.32 –40°C to +125°C M9G 10k 3-Lead SC70 ADM809ZAKS-REEL7 2.32 –40°C to +125°C M9G 3k 3-Lead SC70 ADM809ZART-REEL 2.32 –40°C to +125°C 9ZXX 10k 3-Lead SOT-23 ADM809ZART-REEL7 2.32 –40°C to +125°C 9ZXX 3k 3-Lead SOT-23 ADM809ZARTZ-REEL* 2.32 –40°C to +125°C M4P 10k 3-Lead SOT-23 ADM809ZARTZ-REEL7* 2.32 –40°C to +125°C M4P 3k 3-Lead SOT-23
REV. E–4–
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