DS1233A Dallas Semiconductor, DS1233A Datasheet

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DS1233A

Manufacturer Part Number
DS1233A
Description
Manufacturer
Dallas Semiconductor
Datasheet

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FEATURES
§ Automatically restarts microprocessor after
§ Monitors pushbutton for external override
§ Internal circuitry debounces pushbutton
§ Maintains reset for 350ms after V
§ Accurate 10% or 15% microprocessor 3.3V
§ Reduces need for discrete components
§ Precision temperature-compensated voltage
§ Low-cost TO-92 package or surface mount
§ Internal 5kW pull-up resistor
§ Operating temperature of -40°C to +85°C
DESCRIPTION
The DS1233A 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 (V
signal is generated which forces reset to the active state. When V
the reset signal is kept in the active state for approximately 350ms to allow the power supply and
processor to stabilize. The second function of the DS1233A is pushbutton reset control. The DS1233A
debounces a pushbutton closure and will generate a 350ms reset pulse upon release.
OPERATION — POWER MONITOR
The DS1233A provides the functions of detecting out-of-tolerance power supply conditions and warning
a processor-based system of impending power failure. When V
defined by the tolerance of the part selected, the
for approximately 350ms after the power supply has reached the selected tolerance. This allows the power
supply and microprocessor to stabilize before
www.maxim-ic.com
power failure
switch
an in-tolerance condition or pushbutton
released
power supply monitoring
reference and voltage sensor
SOT-223 package
CC
). When an out-of-tolerance condition is detected, an internal power fail
CC
returns to
RST
RST
1 of 5
is released.
signal is asserted. On power-up,
PIN ASSIGNMENT
PIN DESCRIPTION
PIN 1
PIN 2
PIN 3
PIN 4
TO-92 PACKAGE
BOTTOM VIEW
Drawings Section
on Website
See Mech.
DS1233A
DALLAS
1 2 3
1 2 3
Econo
Reset
CC
CC
GROUND
V
GROUND (SOT-223 ONLY)
RESET
returns to an in-tolerance condition,
CC
is detected as out-of-tolerance as
3.3V EconoReset
SOT-223 PACKAGE
Drawings Section
2
TOP VIEW
on Website
See Mech.
RST
1
4
DS1233A
3
is kept active
122001

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DS1233A Summary of contents

Page 1

... When V the reset signal is kept in the active state for approximately 350ms to allow the power supply and processor to stabilize. The second function of the DS1233A is pushbutton reset control. The DS1233A debounces a pushbutton closure and will generate a 350ms reset pulse upon release. ...

Page 2

... DS1233A is not in a reset cycle, it continuously monitors the is detected, the DS1233A will debounce the switch by pulling the has expired, the DS1233A will continue to monitor the continue to monitor the line looking for a rising edge. Upon detecting a release, the DS1233A will force the line low and hold it low for 350ms. ...

Page 3

PUSHBUTTON RESET Figure 3 POWER-UP Figure 4 POWER-DOWN Figure ...

Page 4

ABSOLUTE MAXIMUM RATINGS* Voltage on V Pin Relative to Ground CC Voltage on I/O Relative to Ground Operating Temperature Range Storage Temperature Range Soldering Temperature * This is a stress rating only and functional operation of the device at these ...

Page 5

... ECONORESET SELECTION GUIDE DS1233-15 DS1233-10 DS1233-5 DS1233D-15 5V DS1233D-10 DS1233D-5 DS1833-15 DS1833-10 DS1833-5 DS1233A-15 3.3V DS1233A-10 V TRIP POINT CC MIN TYP MAX 4.0 4.125 4.24 4.25 4.375 4.49 4.5 4.625 4.75 4.0 4.125 4.24 4.25 4.375 4.49 4.5 4.625 4.75 4.0 4.125 4.24 4.25 4.375 4.49 4.5 4.625 4.75 2.64 2.72 2.80 2.8 2.88 2. PUSHBUTTON DETECT MIN TYP MAX 1.8 - 3.3 1.8 - 3.3 1.8 - 3.3 N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A 0.8 - 2.0 0.8 - 2.0 ...

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