SS8039 Datasheet, PDF (1/7 Pages) Silicon Standard Corp. – Microprocessor Voltage Monitor with Manual Reset

SS8039
Microprocessor Voltage Monitor with Manual Reset
Features
Precision monitoring of +3V, +3.3V, and +5V
power-supply voltages
Fully specified over temperature
Available in two output configurations
Push-pull RESET output (SS8039L)
Push-pull RESET output (SS8039H)
Manual reset input
Power-on reset pulse width of 140ms min
Supply current of 5µA
Guaranteed reset valid to V_CC = +1V
Power supply transient immunity
No external components
4-Pin SOT-143 package
Applications
Computers
Controllers
Intelligent instruments
Critical µP and µC power monitoring
Portable / battery-powered equipment
Automotive
Compatible with the popular "811" series
General Description
The SS8039 is a microprocessor (µP) supervisory
circuit used to monitor the power supplies in µP and
digital systems. It provides excellent circuit reliability
and low cost by eliminating external components and
adjustments when used with +5V, +3.3V, +3.0V- pow-
ered circuits.
These circuits perform a single function: they assert a
reset signal whenever the V_CC supply voltage declines
below a preset threshold, keeping it asserted for at least
140ms after V_CC has risen above the reset threshold.
Reset thresholds suitable for operation with a variety of
supply voltages are available.
The SS8039 has a push-pull output stage. The
SS8039L has an active-low RESET output, while the
SS8039H has an active-high RESET output. The reset
comparator is designed to ignore fast transients on V_CC,
and the outputs are guaranteed to be in the correct logic
state for V_CC down to 1V.
Low supply current makes the SS8039 ideal for use
in portable equipment, and it is available in a 4-pin
SOT-143 package.
Pin Configuration
GND
1
4 ^VCC
SS8039
RESET(RESET) 2
(RESET) for SS8039H
3 MR
SOT143
Typical Application
V _CC
V_CC
V _CC
SS8039
MR ^RESET
(RESET)
µP
RESET
INPUT
GND
GND
(RESET) for SS8039H
Rev.2.02 1/06/2004
www.SiliconStandard.com
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