ADM825 Series

Supervisory Circuit with Watchdog and Manual Reset in 5-Lead SC70 and SOT-23

Catalog

Supervisory Circuit with Watchdog and Manual Reset in 5-Lead SC70 and SOT-23

Part	Mounting Type	Reset Timeout [Min]	Type	Package / Case	Reset	Operating Temperature [Min]	Operating Temperature [Max]	Output	Supplier Device Package	Number of Voltages Monitored	Voltage - Threshold
Analog Devices ADM825MYRJ-R7	Surface Mount	140 ms	Simple Reset/Power-On Reset	SC-74A SOT-753	Active High/Active Low	-40 °C	125 °C	Push-Pull	SOT-23-5	1
Analog Devices ADM825LYRJZ-R7	Surface Mount	140 ms	Simple Reset/Power-On Reset	SC-74A SOT-753	Active High/Active Low	-40 °C	125 °C	Push-Pull	SOT-23-5	1	4.63 V
Analog Devices ADM825TYRJ-R7	Surface Mount	140 ms	Simple Reset/Power-On Reset	SC-74A SOT-753	Active High/Active Low	-40 °C	125 °C	Push-Pull	SOT-23-5	1	3.08 V
Analog Devices ADM825SYKSZ-R7	Surface Mount	140 ms	Simple Reset/Power-On Reset	5-TSSOP SC-70-5 SOT-353	Active High/Active Low	-40 °C	125 °C	Push-Pull	SC-70-5	1	2.93 V
Analog Devices ADM825SYRJ-R7	Surface Mount	140 ms	Simple Reset/Power-On Reset	SC-74A SOT-753	Active High/Active Low	-40 °C	125 °C	Push-Pull	SOT-23-5	1	2.93 V
Analog Devices ADM825YYKS-R7	Surface Mount	140 ms	Simple Reset/Power-On Reset	5-TSSOP SC-70-5 SOT-353	Active High/Active Low	-40 °C	125 °C	Push-Pull	SC-70-5	1	2.19 V
Analog Devices ADM825LYRJ-R7	Surface Mount	140 ms	Simple Reset/Power-On Reset	SC-74A SOT-753	Active High/Active Low	-40 °C	125 °C	Push-Pull	SOT-23-5	1	4.63 V
Analog Devices ADM825SYRJZ-R7	Surface Mount	140 ms	Simple Reset/Power-On Reset	SC-74A SOT-753	Active High/Active Low	-40 °C	125 °C	Push-Pull	SOT-23-5	1	2.93 V

Catalog

Supervisory Circuit with Watchdog and Manual Reset in 5-Lead SC70 and SOT-23

Key Features

• Precision 2.5 V to 5 V power supply monitor

• 7 reset threshold options:2.19 V to 4.63 V

• 140 ms (minimum) reset timeout

• Manual reset input (ADM823, ADM825)

• Low power consumption (5 μA)

• Push-pull output stagesRESET(ADM823)RESET,RESET (ADM824/ADM825)

• Watchdog timer with 1.6 sec timeout (ADM823, ADM824)

• See Data Sheet for Additional Information

Description

TheADM823/ADM824/ ADM825 are supervisory circuits that monitor power supply voltage levels and code execution integrity in microprocessor-based systems. In addition to 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 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.These parts are available in a choice of seven reset threshold options ranging from 2.19 V to 4.63 V. The reset and watchdog timeout periods are fixed at 140 ms (minimum) and 1.6 sec (typical), respectively.The ADM823 / ADM824 / ADM825 are available in 5-lead SC70 and SOT-23 packages and typically consume only 5 μA, making them suitable for use in low power, portable applications.APPLICATIONSMicroprocessor systemsComputersControllersIntelligent instrumentsPortable equipment