Analog Devices ADM809-5SART-REEL-7, ADM809-5SART-REEL, ADM809-5LART-REEL-7, ADM809-5LART-REEL, ADM809-5CHIPS Datasheet
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otherwise under any patent or patent rights of Analog Devices.
a
ADM809-5S/L
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700 World Wide Web Site: http://www.analog.com
Fax: 781/326-8703 © Analog Devices, Inc., 2000
Microprocessor
Supervisory Circuit
FUNCTIONAL BLOCK DIAGRAM
V
REF
V
CC
RESET
GENERATOR
55ms
ADM809-5S/L
RESET
GND
FEATURES
Specified Over Temperature
Low Power Consumption (17 A)
Precision Voltage Monitor: 3 V, 5 V Options
Reset Assertion Down to 1 V V
CC
30 ms min Power-On Reset
Logic Low RESET Output
APPLICATIONS
Microprocessor Systems
Computers
Controllers
Intelligent Instruments
Automotive Systems
GENERAL DESCRIPTION
The ADM809-5S/L supervisory circuits monitor 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 ADM809-5S/L provides an active low
reset signal (RESET).
The reset comparator features built-in glitch immunity,
making it immune to fast transients on V
CC
.
The ADM809-5S/L consumes only 17 µA, making it suitable
for low power portable equipment.
RESET
RESET
INPUT
GND GND
V
CC
V
CC
P
SYSTEM
ADM809-5S/L
V
CC
Figure 1. Typical Operating Circuit
–2–
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ADM809-5S/L–SPECIFICATIONS
Parameter Min Typ Max Unit Test Conditions/Comments
V
CC
Operating Voltage Range 1.0 3.3 5.5 V TA = 0°C to +150°C with 100 kΩ Pull-Down on Output
(Figure 3)
1.2 3.3 5.5 V T
A
= –40°C to +150°C with 22 kΩ External Pull-Up
on Output (Figure 6)
Supply Current 24 60 µAV
CC
< 5.5 V, ADM8_L, TA = –40°C to +85°C
17 50 µAV
CC
< 3.6 V, ADM8_S, TA = –40°C to +85°C
100 µAV
CC
< 5.5 V, ADM8_L, TA = +85°C to +150°C
100 µAV
CC
< 3.6 V, ADM8_S, TA = +85°C to +150°C
RESET THRESHOLD
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 TA = +85°C to +150°C
Reset Threshold Temperature Coefficient 30 ppm/°C
VCC to Reset Delay 20 µsV
CC
= VTH to (VTH –100 mV)
Reset Active Timeout Period 30 55 80 ms TA = –40°C to +150°C
RESET Output Voltage Low 0.3 V V
CC
= VTH min, I
SINK
= 1.2 mA, ADM809-5S
0.4 V V
CC
= VTH min, I
SINK
= 3.2 mA, ADM809-5L
0.3 V V
CC
>1.0 V, I
SINK
= 50 µA, TA = 0°C to +150°C
VCC >1.2 V, I
SINK
= 50 µA, TA = –40°C to +150°C
RESET Output Voltage High 0.8 V
CC
VV
CC
> VTH max, I
SOURCE
= 500 µA
VCC – 1.5 V VCC > VTH max, I
SOURCE
= 800 µA
JUNCTION TEMPERATURE –40 +150 °C
(VCC = Full Operating Range, TA = T
MIN
to T
MAX
, VCC typ = 5 V for L, 3.3 V for S
Models unless otherwise noted.)
ABSOLUTE MAXIMUM RATINGS*
(TA = 25°C unless otherwise noted)
VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to +6 V
RESET, RESET . . . . . . . . . . . . . . . . . . –0.3 V to V
CC
+ 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
Derate by 4 mW/°C above 70°C . . . . . . . . . . . . . . . 320 mW
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.
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 ADM809-5S/L 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.
WARNING!
ESD SENSITIVE DEVICE
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