SGM812_15 Datasheet, PDF (1/12 Pages) SG Micro Corp – Microprocessor Supervisory

SGM811/SGM812
Microprocessor Supervisory
with Manual Reset Input
GENERAL DESCRIPTION
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 1.8V, 2.5V, 3V,
3.3V and 5V supply voltage levels.
They provide a reset output during power-up, power-
down and brownout conditions. On power-up, an internal
timer holds reset asserted for 240ms. This holds the
microprocessor in a reset state until conditions have
stabilized. The RESET output remains operational with
V_CC as low as 1V. The SGM811 provides an active low
reset signal ( RESET ) while the SGM812 provides an
active high signal (RESET) output.
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
SOT-143 and SOT-23-5 packages.
APPLICATIONS
Microprocessor Systems
Controllers
Intelligent Instruments
Automotive Systems
Safety Systems
Portable Instruments
FEATURES
● Superior Upgrade for MAX811/MAX812 and
ADM811/ADM812
● Specified Over Temperature
● Low Power Consumption (13μA TYP)
● Precision Voltage Monitor: 1.8V, 2.5V, 3V, 3.3V
and 5V Options
● Reset Assertion Down to 1V V_CC
● 150ms Min Power-On Reset
Logic Low RESET Output (SGM811)
Logic High RESET Output (SGM812)
● Manual Reset Input
● Green SOT-143 and SOT-23-5 Packages
PIN CONFIGURATIONS (TOP VIEW)
SOT-143
GND 1
4 VCC
RESET/RESET ²
3 MR
GND 1
NC 2
RESET/RESET ³
SOT-23-5
5 VCC
4 _MR
TYPICAL OPERATION CIRCUIT
VCC
SGM811
VCC
MICROPROCESSOR
SYSTEM
MR
RESET
GND
100kΩ
RESET
GND
SG Micro Corp
www.sg-micro.com
REV. B. 4