ASM1834 Datasheet | onsemi

Description The ASM1834 supervisors simultaneously monitor both 3.3 V and 5 V power sources and generate reset signals when either supply is out of tolerance. When an out- of- tolerance condition is detected, the output- reset signal of the affected supply bees active and resets the system microprocessor/microcontroller. On power- up and after the supply voltage returns to an in- tolerance condition, the reset signal remains active for approximately 350 ms. This allows the power supply and system microprocessor to stabilize. Tolerance levels are independently selectable for both supplies. Tolerance options are 5% and 10% for the 5 V supply and 10% and 20% for the 3.3 V supply. The ASM1834 and ASM1834D have push- pull reset output stages. The ASM1834A reset outputs are open drain devices that can both be connected to either 5 V or 3.3 V supply. The ASM1834 and ASM1834A have active LOW reset outputs. The ASM1834D has active HIGH reset outputs. All devices can generate reset signals through an internally debounced pushbutton reset input that affects both reset outputs. All devices operate over the extended industrial temperature range. Devices are available in 8- pin DIP, surface mount 8- pin SO and 8- Pin Micro SO packages. Die are also available. http://onsemi. PDIP- 8 NO SUFFIX CASE 646AA MICRO- 8 U SUFFIX CASE 846AA SOIC- 8 S SUFFIX CASE 751BD PIN CONFIGURATION 5VIN 5V RESET- 5V TOL GND ASM1834 ASM1834A ASM1834D (Top View) 3.3VIN 3.3V RESET- 3.3V TOL PBRST - AS1834D reset outputs are active HIGH (5V RESET and 3.3V RESET) Outputs are open- drain for AS1834A. Features - Monitors 5 V and 3.3 V Supplies Simultaneously - 5 V and 3.3 V Power- on Reset - 350 ms Reset Time - Debounced Pushbutton Reset Input - Push- pull CMOS Output ASM1834, ASM1834D Eliminates External Pull- up Resistors Active LOW (ASM1834), HIGH (ASM1834D) - Open Drain Output ASM1834A Active LOW - Selectable 5 V and 3.3 V Trip Point Tolerance - Internal Power Drawn from Highest Input Voltage, 5 V or 3.3 V -...