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PDF ASM1832 Data sheet ( Hoja de datos )
| Número de pieza | ASM1832 | |
| Descripción | 3.3V UP Power Supply Monitor and Reset Circuit | |
| Fabricantes | Alliance Semiconductor | |
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February 2005
ASM1832
rev 1.5
3.3V µP Power Supply Monitor and Reset Circuit
General Description
The ASM1832 is a fully integrated microprocessor supervisor. It
can halt and restart a “hung-up” microprocessor, restart a
microprocessor after a power failure. It has a watchdog timer
and external reset override. RESET and RESET outputs are
push-pull.
A precision temperature-compensated reference and
comparator circuits monitor the 3.3V, VCC input voltage status.
During power-up or when the VCC power supply falls outside
selectable tolerance limits, both RESET and RESET become
active. When VCC rises above the threshold voltage, the reset
signals remain active for an additional 250ms minimum,
allowing the power supply and system microprocessor to
stabilize. The trip point tolerance signal, TOL, selects the trip
level tolerance to be either 10% or 20%.
Devices are available in 8-pin PDIP, 8-pin SO and compact 8-
pin MicroSO packages.
Key Features
• 3.3V supply monitor
• Push-pull output
• Selectable watchdog period
• Debounce manual push-button reset input
• Precision temperature-compensated voltage reference
and comparator.
• Power-up, power-down and brown out detection
• 250ms minimum reset time
• Active LOW and HIGH reset signal
• Selectable trip point tolerance: 10% or 20%
• Low-cost 8-pin DIP/SO and 8-pin Micro SO packages
• Wide operating temperature -40°C to +85°C
A debounced manual reset input, PBRST, activates the reset
outputs for a minimum period of 250ms. There is a watchdog
timer to stop and restart a microprocessor that is “hung-up”.
The watchdog timeouts periods are selectable: 150ms, 610ms,
and 1200ms. If the ST input is not strobed LOW before the
time-out period expires, a reset is generated.
Applications
• Microprocessor systems
• Computers
• Controllers
• Portable instruments
• Automotive systems
Typical Operating Circuit
Block Diagram
3.3V
ASM1832
ST
RESET
GND TD TOL
µP
I/O
RESET
VCC
TOL
PBRST
TD
ST
ASM1832
Tolerance Selection
VCC Reference
40KΩ
Push Button
Debounce
Voltage Sense
Comparator
Watchdog
Transition Detector
+-
Reset &
Watchdog Timer
VCC
RESET
VCC
RESET
GND
Alliance Semiconductor
2575 Augustine Drive . Santa Clara, CA 95054 . Tel: 408.855.4900 . Fax: 408.855.4999 . www.alsc.com
Notice: The information in this document is subject to change without notice
1 page  
February 2005
rev 1.5
Absolute Maximum Ratings
ASM1832
Parameter
Min Max Unit
Voltage on VCC
-0.5 7 V
Voltage on ST, TD
-0.5
VCC + 0.5
V
Voltage on PBRST, RESET, RESET
-0.5
VCC + 0.5
V
Operating Temperature Range
-40 +85 °C
Soldering Temperature (for 10 sec)
+260
°C
Storage Temperature
-55
+125
°C
ESD rating
HBM
MM
2 KV
200 V
Note:
1. Voltages are measured with respect to ground
2. These are stress ratings only and functional implication is not implied. Exposure to absolute maxi-
mum ratings for extended periods may affect device reliability.
DC Electrical Characteristics
Unless otherwise stated, 1.2 <= VCC<=5.5V and over the operating temperature range of -40°C to +85°C. All voltages are
referenced to ground.
Parameter
Supply Voltage
ST and PBRST Input High
Level
ST and PBRST Input High
Level
ST and PBRST Input Low
Level
VCC Trip Point (TOL = GND)
VCC Trip Point (TOL = VCC)
Watchdog Timeout Period
Symbol
VCC
Conditions
VIH VCC >=2.7V
VIH VCC<2.7V
VIL
VCCTP
VCCTP
tTD
TD = GND
Min Typ Max Unit
1.0 5.5 V
2
VCC + 0.3
V
VCC - 0.4V
V
-0.3 0.5 V
2.80 2.88 2.97 V
2.47 2.55 2.64 V
62.5 150 250 ms
3.3V µP Power Supply Monitor and Reset Circuit
Notice: The information in this document is subject to change without notice
5 of 9
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| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet ASM1832.PDF ] | |
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