DS1236

DS1236 MicroManager Chip www.dalsemi.com FEATURES Holds microprocessor in check during power transients Halts and restarts an out-of-control microprocessor Monitors pushbutton for external override Warns microprocessor of an impending power failure Converts CMOS SRAM into nonvolatile memory Unconditionally write-protects memory when power supply is out of tolerance Consumes less than 100 nA of battery current at 25°C Controls external power switch for high current applications Accurate 10% power supply monitoring Optional 5% power supply monitoring designated DS1236-5 Provides orderly shutdown in nonvolatile microprocessor applications Supplies necessary control for low-power “stop mode” in battery operated hand-held applications Standard 16-pin DIP or space-saving 16-pin SOIC Optional industrial temperature range -40°C to +85°C PIN ASSIGNMENT VBAT VCCO VCC GND PF PF WC/SC RC 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 RST RST PBRST CEI CEO ST NMI IN VBAT VCCO VCC GND PF PF WC/SC RCI 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 RST RST PBRST CEI CEO ST NMI IN 16-Pin DIP (300-mil) See Mech. Drawings Section 16-Pin SOIC (300-mil) See Mech. Drawings Section PIN DESCRIPTION VBAT VCCO VCC GND PF PF WC/ SC RC IN NMI ST CEO CEI PBRST RST RST - +3-Volt Battery Input - Switched SRAM Supply Output - +5-Volt Power Supply Input - Ground - Power-Fail (Active High) - Power-Fail (Active Low) - Wake-Up Control (Sleep) - Reset Control - Early Warning Input - Non-Maskable Interrupt - Strobe Input...