SGM803
SGM809
SGM810
Microprocessor Supervisory
Circuit in 3-Pin SOT23
GENERAL DESCRIPTION
FEATURES
− Precision Voltage Monitor: 2.5V,3 V, 3.3 V, 5 V
Options
− Superior Upgrade for MAX803/MAX809/MAX810
and SGM803/SGM809/SGM810
− Fully Specified over Temperature
− Low Power Consumption (17μA Typ)
− Reset Assertion Down to 1 V VCC
− 160 ms Min Power-On Reset
The SGM803/SGM809/SGM810 supervisory circuits
monitor the power supply voltage in microprocessor and
digital systems. 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 stabilized. The
output remains
RESET
operational with VCC as low as 1 V. The SGM803/SGM809
provides an active low reset signal ( ) while the
RESET
Open-Drain
Push-Pull
Push-Pull RESET Output (SGM810)
Output(SGM803)
RESET
Output (SGM809)
SGM810 provides an active high signal (RESET) output.
The SGM809/SGM810 have push-pull outputs, whereas the
SGM803 has an open-drain output, which requires an
external pull-up resistor.
RESET
− Compact 3-Pin SOT23 Package
Seven reset threshold voltage options are available suitable
for monitoring 2.5V, 3V, 3.3V, and 5V supply voltages.
The reset comparator features built-in glitch immunity,
making it immune to fast transients on VCC
.
The low supply current of typically 17µA makes the
SGM803/SGM809/SGM810 ideal for use in portable, battery
operated equipment. They are available in the 3-pin SOT23
package.
PIN CONFIGURATIONS(TOP VIEW)
APPLICATIONS
GND
1
Microprocessor Systems
Controllers
SGM803
3
VCC
SGM809
SGM810
Intelligent Instruments
Automotive Systems
Safety Systems
2
RESET/RESET
Portable Instruments
SOT23-3
TYPICAL OPERATION CIRCUIT
1
2
RESET
GND
SGM809-
ZXN3L
(only)
VCC
SGM803/SGM809
RESET
VCC
3
VCC
RPULL-UP
MICROPROCESSOR
SYSTEM
SGM803 only
RESET
GND
SOT23-3(L-Type)
GND
REV. B
Shengbang Microelectronics Co, Ltd
Tel: 86/451/84348461
www.sg-micro.com