DALLAS SEMICONDUCTOR DS1915 DS1815 3.3V EconoReset with PushPull Output FEATURES * Automatically restarts a microprocessor after power failure Maintains reset for 150 ms after Vcc returns to an in tolerance condition Reduces need for discrete components @ Precision temperaturecompensated voltage refer- ence and voltage sensor @ Accurate 10% or 20% power monitoring # Low-cost TO--92 or space saving surface-mount SOT-23 packages available PushPull output for low current operation Operating temperature 40C to +85C DESCRIPTION The DS1815 EconoReset uses a precision temperature reference and comparator circuit to monitor the status of the power supply (Vcc). When an out-of-tolerance condition is detected, an internal power fail signal is PIN ASSIGNMENT | 1 2 SOT-23 PACKAGE { | 23 4 TO-92 PACKAGE See Mech. Drawings Section PIN DESCRIPTIONS TO-92 1 RST Active Low Reset Output 2 Veco Power Supply 3 GND Ground SOT-23 1 RST Active Low Reset Output 2 Vec Power Supply 3 GND Ground generated which forces reset to the active state. When Voc returns to an in-tolerance condition, the reset sig- nalis keptin the active state for approximately 150 ms to allow the power supply and processor to stabilize. 185