adm811-3tart-reel Analog Devices, Inc., adm811-3tart-reel Datasheet

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adm811-3tart-reel

Manufacturer Part Number
adm811-3tart-reel
Description
Microprocessors Supervisory Circuit In 4-lead Sot-143, Logic Low Reset Bar Output
Manufacturer
Analog Devices, Inc.
Datasheet

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FEATURES
Superior upgrade for MAX811/MAX812
Specified over temperature
Low power consumption (5 μA typ)
Precision voltage monitor: 2.5 V, 3 V, 3.3 V, 5 V options
Reset assertion down to 1 V
140 ms min power-on reset
Logic low RESET output (ADM811)
Logic high RESET output (ADM812)
Built-in manual reset
APPLICATIONS
Microprocessor systems
Controllers
Intelligent instruments
Automotive systems
Safety systems
Portable instruments
GENERAL DESCRIPTION
The ADM811/ADM812 are reliable voltage monitoring devices
suitable for use in most voltage monitoring applications. The
ADM811/ADM812 are designed to monitor six different
voltages, each allowing a 5% or 10% degradation of standard
PSU voltages before a reset occurs. These voltages have been
selected for the effective monitoring of 2.5 V, 3 V, 3.3 V, and 5 V
supply voltage levels.
Included in this circuit is a debounced manual reset input. Reset
can be activated using an electrical switch (or an input from
another digital device) or by a degradation of the supply
voltage. The manual reset function is very useful, especially if
the circuit in which the ADM811/ADM812 are operating enters
into a state that can only be detected by the user. Allowing the
user to reset a system manually can reduce the damage or
danger that could otherwise be caused by an out-of-control or
locked system.
Rev. D
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.
Trademarks and registered trademarks are the property of their respective owners.
CC
Circuit in 4-Lead SOT-143 with DSP
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113
V
Microprocessor Supervisory
MR
CC
V
REF
FUNCTIONAL BLOCK DIAGRAM
MR
Figure 2. Typical ADM811 Operating Circuit
ADM811
GND
V
CC
RESET
©2006 Analog Devices, Inc. All rights reserved.
ADM811/ADM812
DEBOUNCE
GENERATOR
ADM811/ADM812
RESET
Figure 1.
100kΩ
MICROPROCESSOR
RESET
SYSTEM
GND
V
CC
www.analog.com
RESET/RESET
GND

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adm811-3tart-reel Summary of contents

Page 1

... The manual reset function is very useful, especially if the circuit in which the ADM811/ADM812 are operating enters into a state that can only be detected by the user. Allowing the user to reset a system manually can reduce the damage or danger that could otherwise be caused by an out-of-control or locked system ...

Page 2

... Glitch Immunity............................................................................7 Interfacing to Other Devices............................................................8 Output.............................................................................................8 Benefits of a Very Accurate Reset Threshold ............................8 Ensuring a Valid RESET /Reset Output Down to V Outline Dimensions ..........................................................................9 ADM811 Ordering Guide ............................................................9 ADM812 Ordering Guide ......................................................... 10 1/03—Rev Rev. B Added ADM812 .................................................................Universal Changes to Specifications.................................................................2 Changes to Ordering Guide .............................................................3 Changes to Pin Configuration .........................................................4 Changes to Pin Function Description ...

Page 3

... An Input Rising Above An Input Falling Below RESET/RESET Output Voltage Low (ADM812R/S/T/Z) Low (ADM812L/M) High (ADM812R/S/T/Z/L/M) Low (ADM811R/S/T/Z) Low (ADM811L/M) Low (ADM811R/S/T/Z/L/M) High (ADM811R/S/T/Z) High (ADM811L/ typ = 5 V for L/M, 3.3 V for T/ for R, 2.5 V for Z models, unless otherwise noted. MAX CC Min Typ Max 1.0 5.5 1 ...

Page 4

... ADM811/ADM812 ABSOLUTE MAXIMUM RATINGS Typical values are 25°C, unless otherwise noted. A Table 2. Parameter Terminal Voltage (With Respect to Ground All Other Inputs Input Current Output Current RESET Power Dissipation (T = 70°C) A RT-4 (SOT-143) Derate by 4 mW/°C Above 70°C θ Thermal Impedance ...

Page 5

... V. Ground reference for all signals. 2 RESET (ADM811) Active Low Logic Output. RESET remains low while V RESET then remains low for at least 140 ms (at least 300 ms for the ADM811-3T) after V reset threshold. RESET (ADM812) Active High Logic Output. RESET remains high while V ...

Page 6

... ADM811/ADM812 TYPICAL PERFORMANCE CHARACTERISTICS –40 – TEMPERATURE (°C) Figure 4. Supply Current vs. Temperature (ADM81_R/S/T/Z) 1000 900 800 700 600 500 400 V = 20mV OD 300 200 V = 125mV 200mV OD 100 0 –40 – TEMPERATURE (° ...

Page 7

... This allows time for the power supply and microprocessor to stabilize. The ADM811 provides an active low reset output ( RESET ) while the ADM812 provides an active high output (RESET). During power-down of the ADM811, the RESET output ...

Page 8

... ADM811/ADM812 INTERFACING TO OTHER DEVICES OUTPUT The ADM811/ADM812 are designed to integrate with as many devices as possible. One feature of the ADM811/ADM812 is the reset output, which is directly proportional to V guaranteed only while V is greater than 1 V). This enables the CC part to be used with both 3 V and any nominal voltage ...

Page 9

... ADM811 ORDERING GUIDE Reset 1 Model Threshold (V) ADM811LART-REEL 4.63 ADM811LART-REEL7 4.63 2 ADM811LARTZ-REEL 4.63 ADM811LARTZ-REEL7 2 4.63 ADM811MART-REEL 4.38 ADM811MART-REEL7 4.38 2 ADM811MARTZ-REEL 4.38 2 ADM811MARTZ-REEL7 4.38 ADM811TART-REEL 3.08 ADM811TART-REEL7 3.08 2 ADM811TARTZ-REEL 3.08 2 ADM811TARTZ-REEL7 3.08 ADM811-3TART-REEL 3.08 ADM811-3TART-REEL-7 3.08 ADM811-3TARTZ-RL 2 3.08 2 ADM811-3TARTZ-RL7 3.08 ADM811SART-REEL 2.93 ADM811SART-REEL7 2.93 2 ADM811SARTZ-REEL 2.93 2 ADM811SARTZ-REEL7 2.93 ADM811RART-REEL 2.63 ADM811RART-REEL7 2.63 2 ADM811RARTZ-REEL 2.63 ADM811RARTZ-REEL7 2 2.63 ADM811ZART-REEL 2.32 ADM811ZART-REEL7 2.32 2 ADM811ZARTZ-REEL 2.32 2 ADM811ZARTZ-REEL7 2.32 1 Only available in reels Pb-free part, # denotes lead-free may be top or bottom marked. ...

Page 10

... ADM811/ADM812 ADM812 ORDERING GUIDE Reset 1 Model Threshold (V) ADM812LART-REEL 4.63 ADM812LART-REEL7 4.63 ADM812LARTZ-REEL 2 4.63 2 ADM812LARTZ-REEL7 4.63 ADM812MART-REEL 4.38 ADM812MART-REEL7 4.38 2 ADM812MARTZ-REEL 4.38 2 ADM812MARTZ-REEL7 4.38 ADM812TART-REEL 3.08 ADM812TART-REEL7 3.08 2 ADM812TARTZ-REEL 3.08 2 ADM812TARTZ-REEL7 3.08 ADM812SART-REEL 2.93 ADM812SART-REEL7 2.93 2 ADM812SARTZ-REEL 2.93 2 ADM812SARTZ-REEL7 2.93 ADM812RART-REEL 2.63 ADM812RART-REEL7 2.63 2 ADM812RARTZ-REEL 2.63 2 ADM812RARTZ-REEL7 2.63 ADM812ZART-REEL 2.32 ADM812ZART-REEL7 2.32 ADM812ZARTZ-REEL 2 2.32 2 ADM812ZARTZ-REEL7 2.32 1 Only available in reels Pb-free part. Temperature Ordering ...

Page 11

... NOTES Rev Page ADM811/ADM812 ...

Page 12

... ADM811/ADM812 NOTES ©2006 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. C00092-0-5/06(D) Rev Page ...

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