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ADM809-5LART-REEL7

P1-P3P4-P6P7-P8
Microprocessor
Supervisory Circuit
ADM809-5L/ADM809-5S
Rev. B
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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. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
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Tel: 781.329.4700 www.analog.com
Fax: 781.461.3113 ©2008 Analog Devices, Inc. All rights reserved.
FEATURES
Specified over temperature
Low power consumption: 17 μA
Precision voltage monitor: 3 V, 5 V options
Reset assertion down to 1 V V
CC
30 ms minimum power-on reset
Logic low
RESET
output
Available in SOT-23 and SC70 packages
APPLICATIONS
Microprocessor systems
Computers
Controllers
Intelligent instruments
Automotive systems
GENERAL DESCRIPTION
The supervisory circuit of the ADM809-5L/ADM809-5S monitors
the power supply voltage in microprocessor systems. It provides
a reset output during power-up, power-down, and brownout
conditions. On power-up, an internal timer holds reset asserted
for 55 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 ADM809-5L/ADM809-5S provide
an active low reset signal (
RESET
).
The reset comparator features built-in glitch immunity, making
it immune to fast transients on V
CC
.
The ADM809-5L/ADM809-5S consume only 17 μA, making
them suitable for low power, portable equipment.
FUNCTIONAL BLOCK DIAGRAM
ADM809-5L/
ADM809-5S
GND
RESET
GENERATOR
55ms
RESET
V
CC
V
REF
00090-001
Figure 1.
TYPICAL OPERATING CIRCUIT
GND GND
V
CC
V
CC
ADM809-5L/
ADM809-5S
MICROPROCESSOR
SYSTEM
V
CC
RESET INPUT
RESET
00090-002
Figure 2.
ADM809-5L/ADM809-5S
Rev. B | Page 2 of 8
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications ....................................................................................... 1
General Description ......................................................................... 1
Functional Block Diagram .............................................................. 1
Typical Operating Circuit ................................................................ 1
Revision History ............................................................................... 2
Specifications ..................................................................................... 3
Absolute Maximum Ratings ............................................................ 4
ESD Caution .................................................................................. 4
Pin Configuration and Function Descriptions ..............................5
Typical Performance Characteristics ..............................................6
Theory of Operation .........................................................................7
Interfacing to Output of Other Devices .....................................7
Ensuring a Valid Reset Output Down to V
CC
= 0 V .................7
Benefits of a Very Accurate
RESET
Threshold .............................7
Interfacing to Microprocessors with Multiple Interrupts ........7
Outline Dimensions ..........................................................................8
Ordering Guide .............................................................................8
REVISION HISTORY
10/08—Rev. A to Rev. B
Updated Format .................................................................. Universal
Updated Outline Dimensions ......................................................... 8
Changes to Ordering Guide ............................................................ 8
3/03—Rev. 0 to Rev. A
Added SC70 Package .......................................................... Universal
Changes to Features ......................................................................... 1
Changes to Specifications ............................................................... 2
Changes to Absolute Maximum Ratings ...................................... 2
Changes to Table I .......................................................................... 3
Changes to Ordering Guide ........................................................... 3
Changes to TPC 2 ............................................................................ 4
Updated Outline Dimensions ........................................................ 6
ADM809-5L/ADM809-5S
Rev. B | Page 3 of 8
SPECIFICATIONS
V
CC
= full operating range, T
A
= T
MIN
to T
MAX
, V
CC
typical = 5 V for L models and 3.3 V for S models, unless otherwise noted.
Table 1.
Parameter Min Typ Max Unit Test Conditions/Comments
POWER SUPPLY
V
CC
Operating Voltage Range 1.0 3.3 5.5 V T
A
= 0°C to 150°C with 100 kΩ pull-down on output (Figure 10)
1.2 3.3 5.5 V
T
A
= −40°C to +150°C with 22 kΩ external pull-up on output
(Figure 13)
Supply Current 24 60 μA V
CC
< 5.5 V, ADM809-5L, T
A
= −40°C to +150°C
17 50 μA V
CC
< 3.6 V, ADM809-5S, T
A
= −40°C to +150°C
RESET VOLTAGE THRESHOLD
ADM809-5L 4.5 4.75 V T
A
= −40°C to +85°C
ADM809-5L 4.40 4.86 V T
A
= 85°C to 150°C
ADM809-5S 2.85 3.00 V T
A
= −40°C to +85°C
ADM809-5S 2.78 3.08 V T
A
= 85°C to 150°C
RESET THRESHOLD TEMPERATURE
COEFFICIENT
30 ppm/°C
V
CC
TO RESET DELAY
20 μs
V
CC
= V
TH
to (V
TH
− 100 mV)
RESET ACTIVE TIMEOUT PERIOD 30 55 80 ms T
A
= −40°C to +150°C
RESET OUTPUT VOLTAGE
RESET Output Voltage Low
0.3 V
V
CC
= V
TH
minimum, I
SINK
= 1.2 mA, ADM809-5S
0.4 V V
CC
= V
TH
minimum, I
SINK
= 3.2 mA, ADM809-5L
0.3 V V
CC
>1.0 V, I
SINK
= 50 μA, T
A
= 0°C to 150°C
V
CC
>1.2 V, I
SINK
= 50 μA, T
A
= −40°C to +150°C
RESET Output Voltage High
0.8 V
CC
V
V
CC
> V
TH
maximum, I
SOURCE
= 500 μA
V
CC
− 1.5 V V
CC
> V
TH
maximum, I
SOURCE
= 800 μA
JUNCTION TEMPERATURE −40 +150 °C
P1-P3P4-P6P7-P8

ADM809-5LART-REEL7

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Manufacturer:
Analog Devices Inc.
Description:
Supervisory Circuits RESET GENERATOR I.C.
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