adm1232a Analog Devices, Inc., adm1232a Datasheet

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adm1232a

Manufacturer Part Number
adm1232a
Description
Microprocessor Supervisory Circuit
Manufacturer
Analog Devices, Inc.
Datasheet

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a
GENERAL DESCRIPTION
The ADM1232A is a superior, pin-compatible upgrade for the
MAX1232 and the DS1232LP and DS1232. The ADM1232A
can detect strobe pulsewidths as narrow as 20 ns, making it
compatible with high speed microprocessors. The Analog
Devices ADM1232A is a microprocessor monitoring circuit
that can monitor:
1. Microprocessor Supply Voltage.
2. Whether a Microprocessor has locked up.
3. An External Interrupt.
The ADM1232A is available in four different packages:
1. The ADM1232AARM in an 8-lead SOIC (RM-8).
2. The ADM1232AAN in an 8-lead PDIP (N-8).
3. The ADM1232AARW in a 16-lead wide SOIC (R-16).
4. The ADM1232AARN is an 8-lead narrow SOIC (R-8).
REV. 0
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
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
FEATURES
Superior Upgrade for MAX1232 and Dallas DS1232
Low Power Consumption (500 A max)
Adjustable Precision Voltage Monitor with +4.5 V and
Adjustable STROBE Monitor with 150 ms, 600 ms or
No External Components
Fast (20 ns) Strobe Pulsewidth
APPLICATIONS
Microprocessor Systems
Portable Equipment
Computers
Controllers
Intelligent Instruments
Automotive Systems
Protection Against Damage Caused by P Failure
+4.75 V Options
1.2 sec Options
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
Fax: 781/326-8703
TOLERANCE
PB RESET
GND
Figure 1. Typical Supply Monitoring Application
V
TD
CC
GND
TOLERANCE
WATCHDOG
ADM1232A
FUNCTIONAL BLOCK DIAGRAM
DEBOUNCE
TIMEBASE
TD
SELECT
5%/10%
SELECT
ADM1232
ADM1232
+5V
TOLERANCE
TOLERANCE
World Wide Web Site: http://www.analog.com
VREF
STROBE
STROBE
RESET
RESET
Supervisory Circuit
ADM1232A
+5V
Microprocessor
10k
MICROPROCESSOR
RESET
I/O
GENERATOR
© Analog Devices, Inc., 1999
ADM1232A
RESET
WATCHDOG
TIMER
RESET
RESET
STROBE

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adm1232a Summary of contents

Page 1

... Intelligent Instruments Automotive Systems Protection Against Damage Caused by P Failure GENERAL DESCRIPTION The ADM1232A is a superior, pin-compatible upgrade for the MAX1232 and the DS1232LP and DS1232. The ADM1232A can detect strobe pulsewidths as narrow as 20 ns, making it compatible with high speed microprocessors. The Analog ...

Page 2

... ADM1232A–SPECIFICATIONS P arameter TEMPERATURE POWER SUPPLY Voltage Current STROBE AND PB RESET INPUTS Input High Level Input Low Level INPUT LEAKAGE CURRENT (STROBE, TOLERANCE) TD OUTPUT CURRENT RESET RESET, RESET OUTPUT VOLTAGE RESET/RESET RESET/RESET High Level RESET/RESET Low Level 1 V OPERATION RESET Output Voltage ...

Page 3

... ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on the human body and test equipment and can discharge without detection. Although the ADM1232A features proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance degradation or loss of functionality ...

Page 4

... Push Button Reset Input. This debounced input will ignore pulses of less than 1 ms and is guaranteed to re- spond to pulses greater than 20 ms. Time Delay Set allows the user to select the maximum amount of time the ADM1232A will allow the STROBE TD input to remain inactive (i.e., STROBE is not receiving any high-to-low transitions), without forcing the ADM1232A to generate a RESET pulse ...

Page 5

... The TOLERANCE input is used to determine the level V vary below 5 V without the ADM1232A asserting a reset. Con- necting TOLERANCE to ground will select a –5% tolerance level and will cause the ADM1232A to generate a reset if V falls below 4.75 V (typical). If TOLERANCE is connected –10% tolerance level is selected and will cause the ...

Page 6

... ADM1232A 16-Lead Wide SOIC (R-16) 0.4133 (10.50) 0.3977 (10.00 0.1043 (2.65) PIN 1 0.0118 (0.30) 0.0926 (2.35) 0.0040 (0.10) 0.0500 0.0192 (0.49) SEATING 0.0125 (0.32) (1.27) 0.0138 (0.35) PLANE BSC 0.0091 (0.23) 8-Lead SOIC (RM-8) 0.122 (3.10) 0.114 (2.90 0.122 (3.10) 0.199 (5.05) 0.187 (4.75) 0.114 (2.90 PIN 1 0.0256 (0.65) BSC 0.120 (3.05) 0.112 (2.84) 0.043 (1.09) 0.006 (0.15) 0.037 (0.94) 0.002 (0.05) 0.018 (0.46) SEATING 0 ...

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