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 Summary 9 Options--1.58 to 4.63V
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

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Part# Reset Threshold Summary Min Reset Timeout (ms) Reset Output-Stage Manual Reset Capability Typ Watchdog Timeout (ms) Power Fail Indicator Package Product Description Price* (1000-4999)
AD5100 Programmable Adj Active-Low/Push-Pull Yes adj. Yes SOP System-Mgmt IC with Programmable Quad Voltage Monitoring and Supervisory Functions $1.60
ADM1232 4.37V & 4.62V 250 Active-High/Push-Pull, Active-Low/Open-Drain Yes 250, 500, 62.5 No DIP, SOIC, SOP Microprocessor Supervisory Circuit $0.95
ADM13305 5 Options--0.6Adj to 4.55 140 Active-High/Push-Pull, Active-Low/Push-Pull Yes 1.6 - SOIC Dual Processor Supervisor with Watchdog $0.96
ADM6316 26 Options--2.5 to 5V 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 26 Options--2.5 to 5V 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 26 Options--2.5 to 5V 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 26 Options--2.5 to 5V 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 9 Options--1.58 to 4.63V 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 9 Options--1.58 to 4.63V 140 Active-Low/Open-Drain Yes 1,600 No SOT Low Voltage Supervisory Circuit w/ Watchdog, Manual Reset and Open-Drain Reset Output -
ADM6823 9 Options--1.58 to 4.63V 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 9 Options--1.58 to 4.63V 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 4.65V 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 4.65V 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 4.4V 160 Active-Low/Push-Pull Yes 1,600 Yes DIP, SOIC +3V, Voltage Monitoring µP Supervisory Circuit $1.70