DS1707

www.maxim-ic.com DS1707/DS1708 3.3 and 5.0-Volt MicroMonitor FEATURES § Holds microprocessor in check during power transients § Automatically restarts microprocessor after power failure § Monitors pushbutton for external override § Accurate 5%, 10% or 20% resets for 3.3V systems and 5% or 10% resets for 5.0V systems § Eliminates the need for discrete components § 20% tolerance compatible with 3.0V systems § Pin compatible with the MAXIM MAX707/MAX708 in 8-pin DIP, 8-pin SOIC packages § 8-pin DIP, 8-pin and m-SOP SOIC and 8-pin m-SOP packages available § Industrial temperature range -40°C to +85°C PIN ASSIGNMENT PBRST 1 8 RST VCC GND 2 3 7 RST 6 NC IN 4 5 NMI 8-Pin DIP (300-mil) PBRST 18 RST VCC GND 27 36 RST NC IN 45 NMI 8-Pin SOIC (150-mil) RST RST PBRST VCC 1 2 3 4 8 NC 7 NMI 6 IN 5 GND 8-Pin m-SOP (118-mil) See Mech. Drawings Section on website DS1707 and DS1708_R/S/T PIN DESCRIPTION PBRST VCC GND IN - Pushbutton Reset Input - Power Supply - Ground - Input NMI - Non-maskable Interrupt NC - No Connect RST - Active Low Reset Output RST - Active High Reset Output DESCRIPTION The DS1707/DS1708 3.3- or 5.0-Volt MicroMonitor monitors three vital conditions for a microprocessor: power supply, voltage sense, and external override. A precision temperature-compensated reference and comparator circuit monitor the status of VCC at the device and at an upstream point for maximum protection. When the sense input detects an out-of-tolerance condition a no...