SGM811
SGM812
Microprocessor Supervisory
with Manual Reset Input
GENERAL DESCRIPTION
FEATURES
− Superior Upgrade for MAX811/MAX812 and
ADM811/ADM812
− Specified over Temperature
− Low Power Consumption (17 μA Typ)
− Precision Voltage Monitor: 2.5V,3 V, 3.3 V, 5 V
Options
The SGM811/SGM812 supervisory circuits monitor the
power supply voltage in microprocessor and digital
systems. The SGM811/SGM812 is designed to monitor
seven different voltages, these voltages have been selected
for the effective monitoring of 2.5V, 3 V, 3.3 V, and 5 V
supply voltage levels.
− Reset Assertion Down to 1 V VCC
− 160 ms Min Power-On Reset
They provide
a
reset output during power-up,
power-down and brownout conditions. On power-up, an
internal timer holds reset asserted for 240 ms. This holds
the microprocessor in a reset state until conditions have
Logic Low
Output (SGM811)
RESET
Logic High RESET Output (SGM812)
− Manual Reset Input
stabilized. The
output remains operational with
RESET
V
CC as low as 1 V. The SGM811 provides an active low reset
− Compact 4-Pin SOT143 and 5-Pin SOT23 Packages
signal (
signal (RESET) output.
) while the SGM812 provides an active high
RESET
The SGM811/SGM812 has a manual reset input. The
manual reset function is very useful, especially if the circuit
in which the SGM811/SGM812 is operating enters into a
state that can only be detected by the user. Allowing the
user to reset a system manually can reduce the damage or
danger that could otherwise be caused by an out-of-control
or locked system. The devices come in a 4-pin SOT143
and 5-pin SOT23 packages.
PIN CONFIGURATIONS（TOP VIEW）
SOT143-4
GND
1
4
VCC
2
3
RESET/RESET
MR
APPLICATIONS
Microprocessor Systems
Controllers
Intelligent Instruments
Automotive Systems
Safety Systems
SOT23-5
5
4
VCC
MR
GND
NC
1
2
3
RESET/RESET
Portable Instruments
TYPICAL OPERATION CIRCUIT
VCC
VCC
MICROPROCESSOR
SYSTEM
SGM811
RESET
MR
RESET
GND
100KO
GND
Nov 2006
Shengbang Microelectronics Co, Ltd
Tel: 86/451/84348461
www.sg-micro.com
SGMICRO [ Shengbang Microelectronics Co, Ltd ]
