DS1233

Features:

 Automatically restarts microprocessor after power failure
 Monitors pushbutton for external override
 Internal circuitry debounces pushbutton switch
 Maintains reset for 350 ms after VCC returns to an in-tolerance condition or pushbutton released
 Accurate 5%, 10% or 15% microprocessor 5V power supply monitoring
 Reduces need for discrete components
 Precision temperature-compensated voltage reference and voltage sensor
 Low-cost TO-92 package or surface-mount SOT-223 package
 Internal 5k=pull-up resistor
 Operating temperature of -40°C to +85°C


Pinout

PIN DESCRIPTION
PIN 1 GROUND
PIN 2 RESET
PIN 3 VCC
PIN 4 GROUND (SOT-223 ONLY)

Specifications

Voltage on VCC Pin Relative to Ground                -0.5V to +7.0V
Voltage on I/O Relative to Ground                       -0.5V to VCC +0.5V
Operating Temperature                                       -40°C to +85°C
Storage Temperature                                          -55°C to +125°C
Soldering Temperature                                        260°C for 10 seconds


Description

The DS1233 EconoReset monitors two vital conditions for a microprocessor: power supply and external override. A precision temperature compensated reference and comparator circuit are used to monitor the status of the power supply (VCC). When an out-of-tolerance condition is detected, an internal power-fail signal is generated which forces reset to the active state. When VCC returns to an in-tolerance condition, the reset signal is kept in the active state for approximately 350 ms to allow the power supply and processor to stabilize. The second function of the DS1233 is pushbutton reset control. The DS1233 debounces a pushbutton closure and will generate a 350 ms reset pulse upon release.