Dallas Semiconductor DS1833Z-5, DS1833Z-15, DS1833Z-10, DS1833-5, DS1833-15 Datasheet
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FEATURES
Automatically restarts microprocessor after
power failure
Maintains active-high reset for 350 ms after
VCC 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
PIN DESCRIPTION
PIN 1 Ground
PIN 2 Reset
PIN 3 V
CC
PIN 4 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 (VCC). When an out-of-tolerance condition i s detected, an intern al
power fail signal is generated which forces reset to the active (high) state. When VCC returns to an intolerance 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 VCC 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.
DS1833
5V EconoReset
www.dalsemi.com
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1 2 3
TO-92 PACKAGE
See Mech.
Drawings Section
2
3
4
SOT-223 PACKAGE
See Mech.
Drawings Section
1
DALLAS
DS1833
DS1833
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BLOCK DIAGRAM Figure 1
APPLICATION EXAMPLE Figure 2
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