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SMS1242 Datasheet(PDF) 1 Page - Summit Microelectronics, Inc.

Part # SMS1242
Description  2.5V, 3V, 3.3V & 5V Dual Voltage, Dual Reset Microprocessor Supervisory Circuits
PDF  11 Pages
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Manufacturer  SUMMIT [Summit Microelectronics, Inc.]
Direct Link  http://www.summitmicro.com
Logo SUMMIT - Summit Microelectronics, Inc.

SMS1242 Datasheet(HTML) 1 Page - Summit Microelectronics, Inc.

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© SUMMIT MICROELECTRONICS, Inc. 2000 •
300 Orchard City Drive, Suite 131
•
Campbell, CA 95008
•
Phone 408-378-6461
•
Fax 408-378-6586
•
www.summitmicro.com
1
Characteristics subject to change without notice
2038 2.0 6/8/00
SUMMIT
MICROELECTRONICS, Inc.
SMS1242
FEATURES
• Supply voltage monitor
- Nominal VRST of 2.45V, 2.65V, 2.95V, 4.45V,
4.55V or 4.65V
- RESET# Outputs Guaranteed true at VCC = 1V
- 150ms Reset Delay Time
• Second voltage monitor
-VSENSE Input
- 1.25V threshold ±1%
• Manual Reset Input
• Includes 16k-bits nonvolatile memory
- Industry standard 2-wire serial interface
2.5V, 3V, 3.3V & 5V Dual Voltage, Dual Reset
Microprocessor Supervisory Circuits
OVERVIEW
The SMS1242 microprocessor supervisory circuit re-
duces the complexity and number of components required
to monitor the supply voltage in +5V, +3V and +2.5V
systems. The SMS1242 will significantly improve system
reliability and accuracy when compared to implementing
the same functions with discrete components.
The SMS1242 provides reset output during power-up,
power-down, and brown-out conditions. It has a 1.25V
threshold input detector for power-fail warning, low battery
detection, or monitoring a secondary power supply. The
part also integrates a separate active low manual reset
input.
It also has 16k-bits of nonvolatile memory accessible over
an industry standard 2-wire serial interface.
FUNCTIONAL BLOCK DIAGRAM
+
–
GND
VCC
8
4
RESET1#
2
VTRIP
RESET
GENERATOR
7
1.25V
SCL
6
SDA
5
2038 BD 2.0
NONVOLATILE
MEMORY
ARRAY
VSENSE 3
MR#
1
+
–
RESET2#


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