MAX821MUS-T

Manual Reset : Not Resettable
Battery Backup Switching : No Backup
Supply Voltage - Max : 5.5 V
Mounting Style : SMD/SMT
Packaging : Reel
Number of Voltages Monitored : 1
Watchdog : No Watchdog
Supply Voltage - Min : 1 V
Maximum Power Dissipation : 320 mW
Maximum Operating Temperature : + 125 C
Output Type : Active Low, Push-Pull
Supply Current (Typ) : 7 uA
Power-Up Reset Delay (Typ) : 200 ms
Undervoltage Threshold : 4.31 V
Overvoltage Threshold : 4.45 V
Package / Case : SOT-143
Monitored Voltage : 3 V to 5 V


Pinout




Description

The MAX821MUS-T is one member of the MAX821 series.It has the following features including (1)precision monitoring of +3V to +5V power-supply voltages;(2)power-supply transient immunity;(3)no external components.

The MAX821MUS-T microprocessor (P) supervisory circuits monitor power supplies in P and digital systems.They provide excellent circuit reliability and low cost by eliminating external components and adjustments when used with 5V-powered or 3V-powered circuits.The MAX821MUS-T also provide a power-on reset timeout delay that is pin selectable to 1ms (max),20ms (min), or 100ms (min).These devices perform a single function: they assert a reset signal whenever the VCC supply voltage falls below a preset threshold, and they keep reset asserted for the pin-selected reset timeout delay after VCC has risen above the reset threshold. The only difference between the two devices is that the MAX821MUS-T has an active-low RESET output (which is guaranteed to be in the correct state for VCC down to 1V).Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the MAX821MUS-T. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.

The MAX821MUS-T are designed to meet their worstcase specifications over their entire operating temperature range. Choose a reset threshold guaranteed to assert at a voltage below the power supply's regulation range and above the minimum specified operating voltage range for the system's ICs.Use the three-level Set Reset Timeout (SRT) input to set the reset timeout delay. Connect SRT to GND for a 1ms(max) delay; connect it to VCC for a 20ms (min) delay;or leave it unconnected for a 100ms (min) delay.If you choose to drive the SRT pin with an external signal,make sure the signal source of MAX821MUS-T can charge/discharge the capacitance on SRT quickly enough (<500s) to avert an unintended reset timeout delay.