SS811, SS812
Reset Circuits with Manual Reset Input
FEATURES
DESCRIPTION
Ultra-low supply current of 1mA (typ.)
Guaranteed reset valid to Vcc=0.9V
Available in two output yypes:
Push-pull active-low (SS811)
The SS811 and SS812 are low-power microprocessor
(µP) supervisory circuits used to monitor power supplies
in µP and digital systems. They improve circuit reliability
and reduce cost by eliminating external components.
The SS811 and SS812 also offer a manual reset input.
Push-pull active-high (SS812)
Power-on reset pulse width minimum 140ms
Internally fixed threshold 2.3V, 2.6V, 2.9V, 3.1V, 4.0V,
4.4V, and 4.6V
These devices perform as valid singles in applications
with Vcc ranging from 6.0V down to 0.9V. The reset
signal lasts for a minimum period of 140mswhenever the
VCC supply voltage falls below a preset threshold. Both
the SS811 and SS812 were designed with a reset
comparator to help identify invalid signals lasting less
than 140ms. The only difference between the SS811 and
the SS812 is that one has an active-low RESET output
Tight voltage threshold tolerance: 1.5%
Low profile package: SOT-23-5
APPLICATIONS
l Notebook Computers
l Digital Still Cameras
l PDAs
l Critical Microprocessor Monitoring
and the other has an active-high RESET output.
A low supply current (1mA) makes the SS811 and
SS812 ideal for portable equipment. The devices are
available in a SOT-23-5 package.
TYPICAL APPLICATION CIRCUIT
V
CC
VCC
VCC
SS811
(SS812)
mP
RESET
INPUT
RESET
(RESET)
MR
GND
GND
Pushbutton
Switch
Rev.1.01 4/06/2004
www.SiliconStandard.com
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