DS1233 Dallas, DS1233 Datasheet

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DS1233

Manufacturer Part Number
DS1233
Description
5V EconoReset
Manufacturer
Dallas
Datasheet

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0
Part Number:
DS1233A
Manufacturer:
ST
0
FEATURES
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 (V
signal is generated which forces reset to the active state. When V
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.
OPERATION - POWER MONITOR
The DS1233 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 350 ms after the power supply has reached the selected tolerance. This allows the
power supply and microprocessor to stabilize before
www.dalsemi.com
Automatically restarts microprocessor after
power failure
Monitors pushbutton for external override
Internal circuitry debounces pushbutton
switch
Maintains reset for 350 ms after V
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
CC
). When an out-of-tolerance condition is detected, an internal power-fail
CC
returns
RST
1 of 5
RST
signal is asserted. On power-up,
PIN ASSIGNMENT
PIN DESCRIPTION
PIN 1
PIN 2
PIN 3
PIN 4
TO-92 PACKAGE
Drawings Section
is released.
See Mech.
DALLAS
DS1233
1 2 3
1 2 3
Econo
Reset
CC
CC
GROUND
V
GROUND (SOT-223 ONLY)
RESET
returns to an in-tolerance condition,
is detected as out-of-tolerance, as
CC
5V EconoReset
SOT-223 PACKAGE
Drawings Section
2
See Mech.
RST
1
4
3
DS1233
is kept active
111899

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DS1233 Summary of contents

Page 1

... When V 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. ...

Page 2

... DS1233 will debounce the switch by pulling the expired, the DS1233 will continue to monitor the continue to monitor the line looking for a rising edge. Upon detecting a release, the DS1233 will force the line low and hold it low for 350 ms. RST NOTE: For proper operation with an external pushbutton, a capacitor between 100 pF and 0 ...

Page 3

... PUSHBUTTON RESET Figure 3 POWER UP Figure 4 POWER DOWN Figure DS1233 ...

Page 4

... SYMBOL MIN TYP t 250 350 RST t RPD t 300 250 350 DB t 250 350 RPU to ground. RST DS1233 +0. +85 C) MAX UNITS NOTES 5 =5V 10%) DD MAX UNITS NOTES ...

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 VCC TRIP POINT 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. DS1233 PUSHBUTTON DETECT MIN TYP MAX 2.4 - 3.3 2.4 - 3.3 2.4 - 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 1.8 - 3.0 1.8 - 3.0 ...

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