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Analog Devices Semiconductor Electronic Components Datasheet

ADM6824 Datasheet

(ADM6821 - ADM6825) Low Voltage Supervisory Circuits

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ADM6824 pdf
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Low Voltage Supervisory Circuits with
Watchdog & Manual Reset in 5-Lead SOT-23
Preliminary Technical Data
ADM6821–ADM6825
FEATURES
Precision Low Voltage Monitoring down to 1.8V
9 Reset Threshold Options:
1.58V to 4.63V
140ms (Min) Reset Timeout
Watchdog Timer with 1.6s Timeout
Manual Reset Input
Reset Output Stages
Push-Pull Active-Low
Open-Drain Active-Low
Push-Pull Active-High
Low Power Consumption (3µA)
Guaranteed Reset Output valid to VCC=1V
Power Supply Glitch Immunity
Specified from -40°C to +125°C
5-Lead SOT-23 Package
APPLICATIONS
Microprocessor Systems
Computers
Controllers
Intelligent Instruments
Portable Equipment
FUNCTIONAL BLOCK DIAGRAM
ADM6821
VCC
VREF
MR DEBOUNCE
RESET
GENERATOR
WATCHDOG
DETECTOR
GND
WDI
VCC
RESET
GENERAL DESCRIPTION
The ADM6821-ADM6825 are supervisory circuits which
monitor power supply voltage levels and code execution
integrity in microprocessor-based systems. As well as providing
power-on-reset signals, an on-chip watchdog timer can reset the
microprocessor if it fails to strobe within a preset timeout
period. A reset signal can also be asserted by means of an
external push-button, through a manual reset input. The three
parts feature different combinations of watchdog input, manual
reset input and output stage configuration, as shown in table 1.
Each part is available in a choice of 9 reset threshold options
ranging from 1.58V to 4.63V. The reset and watchdog timeout
periods are fixed at 140ms (min) and 1.6s (typ), respectively.
The ADM6821-ADM6825 are available in 5-lead SOT-23
packages and typically consume only 3µA, making them
suitable for use in low power portable applications.
Part No.
ADM6821
ADM6822
ADM6823
ADM6824
ADM6825
Table 1. Selection Table
Watchdog Timer Manual Reset
Yes Yes
Yes Yes
Yes Yes
Yes -
- Yes
Output Stage
RESET
RESET
- Push-Pull
Open-Drain
-
Push-Pull
-
Push-Pull
Push-Pull
Push-Pull
Push-Pull
Rev. PrA
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 companies.
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 © 2004 Analog Devices, Inc. All rights reserved.


Analog Devices Semiconductor Electronic Components Datasheet

ADM6824 Datasheet

(ADM6821 - ADM6825) Low Voltage Supervisory Circuits

No Preview Available !

ADM6824 pdf
ADM6821–ADM6825
Preliminary Technical Data
ADM6821–ADM6825—SPECIFICATIONS
Table 2. VCC=4. 5V to 5.5V for ADM682_L/M, VCC=2.7V to 3.6V for ADM682_T/S/R, VCC=2.1V to 2.75V for ADM682_Z/Y,
VCC=1.53V to 2.0V for ADM682_W/V, TA=-40°C to +125°C, unless otherwise noted.
Parameter
SUPPLY
VCC Operating Voltage Range
Supply Current (WDI and MR unconnected)
RESET THRESHOLD VOLTAGE
ADM682_L
ADM682_M
ADM682_T
ADM682_S
ADM682_R
ADM682_Z
ADM682_Y
ADM682_W
ADM682_V
RESET THRESHOLD TEMPERATURE COEFFICIENT
RESET THRESHOLD HYSTERESIS
RESET TIMEOUT PERIOD
VCC TO RESET DELAY
RESET Output Voltage Low
RESET Output Voltage High
Min Typ
1
1.2
10
7
5
4.50 4.63
4.47
4.25 4.38
4.22
3.00 3.08
2.97
2.85 2.93
2.83
2.55 2.63
2.53
2.25 2.32
2.24
2.12 2.19
2.11
1.62 1.67
1.61
1.52 1.58
60
2x VTH
140 200
100
20
0.8×VCC
Max Units Test Conditions/Comments
5.5 V TA=0°C to +70°C
5.5 V TA=--40°C to +125°C
24 µA VCC=5.5V, no load,
TA=--40°C to +85°C
30 µA VCC=5.5V, no load,
TA=--40°C to +125°C
16 µA VCC=3.6V, no load,
TA=--40°C to +85°C
25 µA VCC=3.6V, no load,
TA=--40°C to +125°C
12 µA VCC=3.6V, no load,
TA=--40°C to +85°C
(ADM6825 only)
20 µA VCC=3.6V, no load,
TA=--40°C to +125°C
(ADM6825 only)
4.75 V TA=-40°C to +85°C
4.78 V TA=-40°C to +125°C
4.50 V TA=-40°C to +85°C
4.53 V TA=-40°C to +125°C
3.15 V TA=-40°C to +85°C
3.17 V TA=-40°C to +125°C
3.00 V TA=-40°C to +85°C
3.02 V TA=-40°C to +125°C
2.70 V TA=-40°C to +85°C
2.72 V TA=-40°C to +125°C
2.38 V TA=-40°C to +85°C
2.40 V TA=-40°C to +125°C
2.25 V TA=-40°C to +85°C
2.27 V TA=-40°C to +125°C
1.71 V TA=-40°C to +85°C
1.72 V TA=-40°C to +125°C
1.62 V TA=-40°C to +85°C
ppm/°C
mV
280 ms
320 ms
µs VCC = VTH to (VTH - 100mV)
0.4 V VCC>=4.25V, ISINK=3.2mA, reset
asserted
0.3 V VCC>=2.55V, ISINK=1.2mA, reset
asserted
0.3 V VCC>=1.25V, ISINK=100uA, reset
asserted
0.3 V VCC>=1.0V, ISINK=50uA, reset
asserted, TA=-40°C to +85°C
V VCC>=4.75V, ISOURCE=800uA,
reset not asserted
Rev.PrA | Page 2 of 7


Part Number ADM6824
Description (ADM6821 - ADM6825) Low Voltage Supervisory Circuits
Manufacturer Analog Devices
Total Page 7 Pages
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