DS1832 Datasheet, PDF (1/5 Pages) Dallas Semiconductor – 5V EconoReset

www.dalsemi.com
DS1833
5V EconoReset
FEATURES
Automatically restarts microprocessor after
power failure
Maintains active-high reset for 350 ms after
V_CC returns to an in-tolerance condition
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
PIN ASSIGNMENT
DALLAS
DS1833
123
123
TO-92 PACKAGE
See Mech.
Drawings Section
1
24 3
SOT-223 PACKAGE
See Mech.
Drawings Section
PIN DESCRIPTION
PIN 1
Ground
PIN 2
Reset
PIN 3
PIN 4
V_CC
Ground (SOT-223 only)
DESCRIPTION
The DS1833 EconoReset uses a precision temperature compensated reference and comparator circuit to
monitor the status of the power supply (V_CC). When an out-of-tolerance condition is detected, an internal
power fail signal is generated which forces reset to the active (high) state. When V_CC 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.
OPERATION - POWER MONITOR
The DS1833 provides the functions of detecting out-of-tolerance power supply conditions and warning a
processor-based system of impending power failure. When V_CC is detected as out-of-tolerance, as
defined by the tolerance of the part selected, the RST signal is asserted. On power-up, RST is kept active
for approximately 350 ms after the power supply has reached the selected tolerance. This allows the
power supply and microprocessor to stabilize before RST is released.
1 of 5
112099