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PDF ADM809-5S Data sheet ( Hoja de datos )
| Número de pieza | ADM809-5S | |
| Descripción | Microprocessor Supervisory Circuit | |
| Fabricantes | Analog Devices | |
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FEATURES
Specified over temperature
Low power consumption: 17 μA
Precision voltage monitor: 3 V, 5 V options
Reset assertion down to 1 V VCC
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 VCC 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 VCC.
The ADM809-5L/ADM809-5S consume only 17 μA, making
them suitable for low power, portable equipment.
Microprocessor
Supervisory Circuit
ADM809-5L/ADM809-5S
FUNCTIONAL BLOCK DIAGRAM
ADM809-5L/
ADM809-5S
VCC
VREF
RESET
GENERATOR
55ms
RESET
GND
Figure 1.
TYPICAL OPERATING CIRCUIT
VCC
VCC
ADM809-5L/
ADM809-5S
RESET
GND
VCC
MICROPROCESSOR
SYSTEM
RESET INPUT
GND
Figure 2.
Rev. B
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. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113
©2008 Analog Devices, Inc. All rights reserved.
1 page  
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
ADM809-5L/ADM809-5S
GND 1
RESET 2
ADM809-5L/
ADM809-5S
TOP VIEW
(Not to Scale)
3 VCC
Figure 3. Pin Configuration
Table 3. Pin Function Descriptions
Pin No.
Mnemonic
Function
1 GND
Ground Reference for All Signals (0 V).
2 RESET
Active Low Logic Output. RESET remains low while VCC is below the reset threshold, and remains low for
55 ms (typical) after VCC rises above the reset threshold.
3 VCC
Supply Voltage Being Monitored.
VCC
VREF
VREF
VREF
RESET
t1
t1
NOTES
1. t1 = RESET TIME = 55ms TYPICAL.
2. VREF = RESET VOLTAGE THRESHOLD.
Figure 4. Power Fail RESET Timing
Table 4. RESET Threshold Options
Model
ADM809-5L
ADM809-5S
RESET Threshold (V)
4.63
2.93
VREF
Rev. B | Page 5 of 8
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet ADM809-5S.PDF ] | |
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