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ASM162MCUSF

Description
Supervisory Circuit
File Size123KB,7 Pages
ManufacturerON Semiconductor
Websitehttp://www.onsemi.cn
Download Datasheet View All

ASM162MCUSF Overview

Supervisory Circuit

ASM161, ASM162
mP
Supervisory Circuit
Description
The ASM161 and ASM162 are cost effective, low power
supervisory circuits that monitor power supplies in microprocessor,
microcontroller and digital systems. If the power supply drops below
the reset threshold level, a reset is asserted and remains asserted for at
least 800 ms after V
CC
has risen above the reset threshold. An
improved manual reset architecture gives the system designer
additional flexibility.
The debounced manual reset input is negative edge triggered. The
reset pulse period generated by a MR transition is a minimum of
800 ms and a maximum of 2 sec duration. In addition, The MR input
signal is blocked for an additional 49
mS
minimum after the reset pulse
ends. During the MR disable period, the microcontroller is guaranteed
a time period free of additional manual reset signals. During this
period DRAM contents can be refreshed or other critical system tasks
undertaken. Low power consumption makes the ASM161/162 ideal
for use in portable and battery operated equipments. With 3 V
supplies, power consumption is 8
mW
typically and 30
mW
maximum.
The ASM161 has an open−drain, active−LOW RESET output and
requires an external pull−up resistor. The ASM162 has an active
HIGH RESET output.
The ASM161/162 are offered in compact 4−pin SOT−143 packages.
No external components are required to trim threshold voltage for
monitoring different supply voltages. With six different factory set,
reset, threshold ranges from 2.63 V to 4.63 V, the ASM161/162 are
suitable for monitoring 5 V, 3.6 V and 3.0 V supplies. The
ASM161/162 are available in temperature ranges 0°C to 70°C and
−40°C
to +85°C.
Features
http://onsemi.com
SOT−143
4 LEAD
CASE 527AF
PIN CONFIGURATIONS
1
GND
RESET
ASM161
(Top View)
RESET is open drain
V
CC
1
GND
V
CC
MR RESET
ASM162
(Top View)
MR
RESET THRESHOLD
Part Suffix
L
M
J
T
S
R
Voltage (V)
4.63
4.38
4.00
3.08
2.93
2.63
Edge Triggered Manual Reset Input
Single Pulse Output
49
mS
Minimum MR Disable Period After Reset
CMOS/TTL Logic or Switch Interface
Debounced Input
Low Supply Current Extends Battery Life
6
mA
/ 15
mA
typ/max at 5.5 V
4.5
mA
/ 10
mA
typ/max at 3.6 V
Long Reset Period
0.8 Sec Minimum, 2 Sec Maximum
Two Reset Polarity Options
ASM161: Active LOW, Open−drain
ASM162: Active HIGH
Pinout Matches the ASM811/812
Small 4−Pin SOT−143 Package
Two Temperature Ranges: 0°C to 70°C
and
−40°C
to +85°C
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 6 of this data sheet.
Applications
PDAs
Appliances
Computers and Embedded Controllers
Wireless Communication Systems
Battery Operated and Intelligent Instruments
Automotive Systems
Safety Systems
©
Semiconductor Components Industries, LLC, 2011
August, 2011
Rev. 3
1
Publication Order Number:
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