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PDF ADM1232A Data sheet ( Hoja de datos )
| Número de pieza | ADM1232A | |
| Descripción | Microprocessor Supervisory Circuit | |
| Fabricantes | Analog Devices | |
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FEATURES
Precision 5 V voltage monitor with 5% or 10% tolerance options
Adjustable STROBE monitor with 150 ms, 600 ms, or 1.2 sec
options
Fast (20 ns) STROBE pulse width
No external components required
Packaged in 8-Lead SOIC
Specified from −40°C to +85°C
APPLICATIONS
Microprocessor systems
Portable equipment
Computers
Controllers
Intelligent instruments
Automotive systems
Protection against damage caused by microprocessor failure
GENERAL DESCRIPTION
The ADM1232A is pin-compatible to the MAX1232, DS1232LP,
and DS1232. The ADM1232A can detect strobe pulse widths as
narrow as 20 ns, making it compatible with high speed
microprocessors. The Analog Devices, Inc., ADM1232A is a
microprocessor monitoring circuit that monitors micro-
processor supply voltage. It can also detect if a microprocessor
has locked up or an external interrupt has been issued. The
ADM1232A is available in an 8-lead narrow body SOIC and is
specified over the −40°C to +85°C temperature range.
Microprocessor
Supervisory Circuit
ADM1232A
FUNCTIONAL BLOCK DIAGRAM
VCC
TOLERANCE
5%/10%
TOLERANCE
SELECT
RESET
PB RESET
TD
GND
VREF
DEBOUNCE
WATCHDOG
TIMEBASE
SELECT
Figure 1.
WATCHDOG
TIMER
ADM1232A
RESET
STROBE
5V
ADM1232A
STROBE
RESET
GND TD TOLERANCE
5V
10kΩ
MICROPROCESSOR
I/O
RESET
Figure 2. Typical Supply Monitoring Application
Rev. A
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113 ©1999–2009 Analog Devices, Inc. All rights reserved.
1 page  
ADM1232A
ABSOLUTE MAXIMUM RATINGS
TA = 25°C, unless otherwise noted.
Table 2.
Parameter
VCC
Logic Inputs
Storage Temperature Range
Lead Temperature (Soldering, 10 sec)
Vapor Phase (60 sec)
Infrared (15 sec)
Power Dissipation
Derate by 12 mW/°C Above 25°C
θJA Thermal Impedance (Still Air)
Rating
5.5 V
−0.3 V to VCC + 0.3 V
−65°C to +150°C
300°C
215°C
220°C
900 μW
153°C/W
Stresses above those listed under Absolute Maximum Ratings
may cause permanent damage to the device. This is a stress
rating only; functional operation of the device at these or any
other conditions above those indicated in the operational
section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability.
ESD CAUTION
Rev. A | Page 4 of 8
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet ADM1232A.PDF ] | |
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