Dallas Semiconductor DS1233DZ-5, DS1233DZ-15, DS1233DZ-10, DS1233D-5, DS1233D-15 Datasheet
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FEATURES
Automatically restarts microprocessor after
power failure
Maintains 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 5 kΩ pull-up resistor
Compatible with Motorola 68XXX series and
HC16 Microprocessors
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 DS1233D EconoReset uses a precision temperature-compensated reference and compar ator 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 fo rces reset to the acti ve 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 DS1233D 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.
DS1233D
5V EconoReset
www.dalsemi.com
1 2 3
1 2 3
TO-92 PACKAGE
See Mech.
Drawings Section
2
3
4
SOT-223 PACKAGE
See Mech.
Drawings Section
1
DALLAS
DS1233
Econo
Reset
DS1233D
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BLOCK DIAGRAM Figure 1
APPLICATION EXAMPLE Figure 2
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