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ASM1832 Datasheet(PDF) 3 Page - Alliance Semiconductor Corporation

Part No. ASM1832
Description  3.3V UP Power Supply Monitor and Reset Circuit
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Maker  ALSC [Alliance Semiconductor Corporation]
Homepage  http://www.alsc.com
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ASM1832 Datasheet(HTML) 3 Page - Alliance Semiconductor Corporation

   
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Notice: The information in this document is subject to change without notice
3.3V µP Power Supply Monitor and Reset Circuit
ASM1832
rev 1.5
February 2005
Detailed Description
The
ASM1832
monitors
the
microprocessor
or
microcontroller power supply and issues reset signals, both
active HIGH and active LOW, that halt processor operation
whenever the power supply voltage levels are outside a
predetermined tolerance.
RESET and RESET outputs
RESET and RESET signals are active for a minimum of
250ms after the supply has returned to in-tolerance level.
This allows the power supply and monitored processor to
stabilize before instruction execution is allowed to begin.
Trip Point Tolerance Selection
The TOL input is used to determine the level VCC can vary
below 3.3V without asserting a reset. With TOL conected to
VCC, RESET and RESET become active whenever VCC falls
below 2.64V. RESET and RESET become active when the
VCC falls below 2.98V if TOL is connected to ground.
After VCC has risen above the trip point set by TOL, RESET
and RESET remain active for a minimum time period of
250ms. On power-down, once VCC falls below the reset
threshold RESET stays LOW and is guaranteed to be 0.4V or
less until VCC drops below 1.2V. The reset output on the
ASM1832 uses a push-pull drive stage that can maintain a
valid output below 1.2V. To sink current with VCC below 1.2V,
a resistor can be connected from the reset pin (RESET) to
Ground. This configuration will give a valid value on the reset
output with VCC approaching 0V. During both power up and
down, the configuration will draw current when the RESET is
in the high state. The value of 100K
Ω should be adequate to
maintain a valid condition. The active HIGH reset signal is
valid down to a VCC level of 1.2V also.
.
Application Information
Manual Reset Operation
Push-button switch input, PBRST, allows the user to override
the internal trip point detection circuits and issue reset
Microprocessor
RESET
RESET
ASM1832
100kΩ
Tolerance
Select
Tolerance
TRIP Point Voltage
(V)
Min
Nom
Max
TOL = VCC
20%
2.47
2.55
2.64
TOL = GND
10%
2.80
2.88
2.97
~~
~~
VOH
VOL
tRPU
RESET
RESET
VCCTP(MIN)
VCCTP(MAX)
VCCTP
tR
VCC
Figure 1: Timing Diagram : Power Up
~~
~~
VOH
VOL
VCCTP (MAX)
VCCTP
VCCTP (MIN)
RESET
RESET
tF
VCC
tRPD
Figure 2: Timing Diagram : Power Down


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