ADM6821:  Low Voltage Supervisory Circuit with Watchdog, Manual Reset and Active-High, Push-Pull Reset Output

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 ...More

ADM6821:  Low Voltage Supervisory Circuit with Watchdog, Manual Reset and Active-High, Push-Pull Reset Output

Product 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.

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-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

Diagrams

ADM6821 Diagram
Functional Block Diagram for ADM6821

Specifications

Batt-Backup-Flg No
Manual Reset Capability Yes
Reset Threshold (V) 1.58,1.67,2.19,2.32,2.63,2.93,3.08,4.38,4.63
Reset Output-Stage Active-High/Push-Pull
Min Reset Timeout (ms) 140
Typ Watchdog Timeout (ms) 1600
Watchdog Timer Yes
Package SOT
Power Fail Indicator No

Explore Other Products

Part# Reset Threshold (V) Min Reset Timeout (ms) Reset Output-Stage Manual Reset Capability Typ Watchdog Timeout (ms) Power Fail Indicator Package Product Description Price* (1000-4999)
AD5100 Adjustable Adj Active-Low/Push-Pull Yes adj. Yes SOP System-Mgmt IC with Programmable Quad Voltage Monitoring and Supervisory Functions -
ADM1232 4.37, 4.62 250 Active-High/Push-Pull, Active-Low/Open-Drain Yes 250, 500, 62.5 No DIP, SOIC, SOP Microprocessor Supervisory Circuit $0.95
ADM13305 0.6, 1.68, 2.25, 2.93, 4.55, Adjustable 140 Active-High/Push-Pull, Active-Low/Push-Pull Yes 1.6 - SOIC Multi-Voltage Supervisory Circuit $0.96
ADM6316 2.5, 2.63, 2.7, 2.8, 2.93, 3.0, 3.08, 3.2, 3.3, 3.4, 3.5, 3.6, 3.7, 3.8, 3.9, 4.0, 4.1, 4.2, 4.3, 4.39, 4.5, 4.63, 4.7, 4.8, 4.9, 5.0 1, 1,200, 140, 20 Active-Low/Push-Pull Yes 102, 1,600, 25,600, 6.3 No SOT Supervisory Ckt w/ Watchdog, Manual Reset & Active-Low, Push-Pull Reset Output in 5-Lead SOT-23 $0.51
ADM6318 2.5, 2.63, 2.7, 2.8, 2.93, 3.0, 3.08, 3.2, 3.3, 3.4, 3.5, 3.6, 3.7, 3.8, 3.9, 4.0, 4.1, 4.2, 4.3, 4.39, 4.5, 4.63, 4.7, 4.8, 4.9, 5.0 1, 1,200, 140, 20 Active-High/Push-Pull, Active-Low/Push-Pull No 102, 1,600, 25,600, 6.3 No SOT Supervisory Circuit with Watchdog and Dual Active-Low/Active-High Push-Pull Reset Outputs $0.50
ADM6320 2.5, 2.63, 2.7, 2.8, 2.93, 3.0, 3.08, 3.2, 3.3, 3.4, 3.5, 3.6, 3.7, 3.8, 3.9, 4.0, 4.1, 4.2, 4.3, 4.39, 4.5, 4.63, 4.7, 4.8, 4.9, 5.0 1, 1,200, 140, 20 Active-Low/Open-Drain Yes 102, 1,600, 25,600, 6.3 No SOT Supervisory Circuit with Watchdog, Manual Reset & Active-Low, Open-Drain Reset Output $0.51
ADM6321 2.5, 2.63, 2.7, 2.8, 2.93, 3.0, 3.08, 3.2, 3.3, 3.4, 3.5, 3.6, 3.7, 3.8, 3.9, 4.0, 4.1, 4.2, 4.3, 4.39, 4.5, 4.63, 4.7, 4.8, 4.9, 5.0 1, 1,200, 140, 20 Active-High/Push-Pull, Active-Low/Open-Drain No 102, 1,600, 25,600, 6.3 No SOT Supervisory Circuit with Watchdog and Dual Active-Low Open-Drain/Active-High Push-Pull Reset Outputs $0.51
ADM6821 1.58, 1.67, 2.19, 2.32, 2.63, 2.93, 3.08, 4.38, 4.63 140 Active-High/Push-Pull Yes 1,600 No SOT Low Voltage Supervisory Circuit w/ Watchdog, Manual Reset and Active-High, Push-Pull Reset Output -
ADM6822 1.58, 1.67, 2.19, 2.32, 2.63, 2.93, 3.08, 4.38, 4.63 140 Active-Low/Open-Drain Yes 1,600 No SOT Low Voltage Supervisory Circuit w/ Watchdog, Manual Reset and Open-Drain Reset Output -
ADM6823 1.58, 1.67, 2.19, 2.32, 2.63, 2.93, 3.08, 4.38, 4.63 140 Active-Low/Push-Pull Yes 1,600 No SOT Low Voltage Supervisory Circuit w/ Watchdog, Manual Reset and Active-Low, Push-Pull Reset Output $0.76
ADM6824 1.58, 1.67, 2.19, 2.32, 2.63, 2.93, 3.08, 4.38, 4.63 140 Active-High/Push-Pull, Active-Low/Push-Pull No 1,600 No SOT Low Voltage Supervisory Circuit w/ Watchdog, Manual Reset, Active-Hi & Low Push-Pull Reset Output -
ADM699 4.65 140 Active-High/Push-Pull, Active-Low/Push-Pull No 1,600 No DIP, SOIC µP Supv w/ Watchdog, 4.65V Trip Point, Low Supply Current and Active Low Reset Output $1.68
ADM705 4.65 160 Active-Low/Push-Pull Yes 1,600 Yes DIP, SOIC µP Supv w/ 4.65V Trip Voltage, Watchdog, Pwr Fail, Manual Reset & Active Low Reset Output $1.02
ADM706 4.4 160 Active-Low/Push-Pull Yes 1,600 Yes DIP, SOIC +3V, Voltage Monitoring µP Supervisory Circuit $1.70
ADM823 2.19, 2.32, 2.63, 2.93, 3.08, 4.38, 4.63 140 Active-Low/Push-Pull Yes 1,600 No SC70, SOT Supervisory Circuit with Watchdog, Manual Reset and Active-Low, Push-Pull Reset Output $0.51
ADM824 2.19, 2.32, 2.63, 2.93, 3.08, 4.38, 4.63 140 Active-High/Push-Pull, Active-Low/Push-Pull No 1,600 No SC70, SOT Supervisory Circuit with Watchdog, Active-High &-Low Push-Pull Reset Output $0.51
ADM8616 1.58, 1.67, 2.19, 2.32, 2.63, 2.93, 3.08, 4.38, 4.63 1, 1,120, 140, 20 Active-Low/Push-Pull No 102, 1,600, 6.3 No SC70 Low Voltage Supervisory Circuit w/ Watchdog and Active-Low, Push-Pull Reset Output--- in 4-Lead SC70 $0.86
ADM8617 1.58, 1.67, 2.19, 2.32, 2.63, 2.93, 3.08, 4.38, 4.63 1, 1,120, 140, 20 Active-Low/Open-Drain No 102, 1,600, 6.3 No SC70 Low Voltage Supervisory Circuit w/ Watchdog & active-low open-drain output in 4-Lead SC70 $0.86
ADM8699 4.65 140 Active-High/Push-Pull, Active-Low/Push-Pull No 1,600 No DIP, SOIC µP Supervisory Circuit with Watchdog, 4.65V Trip Point $2.01
ADM9690 4.31 10 typ, 50 typ Active-Low/Push-Pull No 0.75, 1.5, 12.5, 25 No SOIC Power Supply and Watchdog Timer Monitoring Circuit $1.52
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