DS1833
5V EconoReset
www.dalsemi.com
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
1
1 2 3
1 2 3
TO-92 PACKAGE
See Mech.
Drawings Section
2 4 3
SOT-223 PACKAGE
See Mech.
Drawings Section
PIN DESCRIPTION
PIN 1
PIN 2
PIN 3
PIN 4
Ground
Reset
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.
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112099
DS1833
ABSOLUTE MAXIMUM RATINGS*
Voltage on V
CC
Pin Relative to Ground
Voltage on I/O Relative to Ground
Operating Temperature
Storage Temperature
Soldering Temperature
-0.5V to +7.0V
-0.5V to V
CC
+0.5V
-40°C to +85°C
-55°C to +125°C
260°C for 10 seconds
* This is a stress rating only and functional operation of the device at these or any other conditions
above those indicated in the operation sections of this specification is not implied. Exposure to
absolute maximum rating conditions for extended periods of time may affect reliability.
RECOMMENDED DC OPERATING CONDITIONS
PARAMETER
Supply Voltage
SYMBOL
V
CC
MIN
1.2
TYP
5.0
MAX
5.5
(-40°C to +85°C)
UNITS
V
NOTES
1
DC ELECTRICAL CHARACTERISTICS
PARAMETER
Low Level @ RST
Output Current @ 0.4V
Operating Current
V
CC
Trip Point 5%
V
CC
Trip Point 10%
V
CC
Trip Point 15%
Output Capacitance
Internal Pull-Up Resistor
SYMBOL
V
OL
I
OL
I
CC
V
CCTP1
V
CCTP2
V
CCTP3
C
OUT
R
P
4.5
+8
(-40°C to +85°C; V
DD
=5V
±
10%)
MIN
TYP
MAX
0.4
1.5
4.625
4.375
4.125
5
4.25
4.0
3.75
2
4.74
4.49
4.24
10
6.25
UNITS
V
mA
mA
V
V
V
pF
kΩ
1
1
1
NOTES
1
AC ELECTRICAL CHARACTERISTICS
PARAMETER
Reset Active Time
V
CC
Detect to RST
V
CC
Slew Rate (4.75V - 4.00V)
V
CC
Slew Rate (4.00V - 4.75V)
V
CC
Detect to RST
SYMBOL
t
RST
t
RPD
t
F
t
R
t
RPU
(-40°C to +85°C; V
CC
=5V
±
10%)
MIN
250
300
0
250
350
450
TYP
350
MAX
450
100
UNITS
ms
ns
µs
ns
ms
NOTES
NOTES:
1. All voltages are referenced to ground.
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