cat1232 Catalyst Semiconductor, cat1232 Datasheet

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cat1232

Manufacturer Part Number
cat1232
Description
5v And 3.3v Supply Monitor, Watchdog Timer, Manual Reset, With Active High & Low Resets
Manufacturer
Catalyst Semiconductor
Datasheet

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5V and 3.3V Supply Monitor, Watchdog Timer,
Manual Reset, with Active High & Low Resets
FEATURES
T Selectable reset voltage tolerance
T Selectable watchdog period:
T Two reset outputs
T Debounced manual push-button reset
T Compact SOIC and MSOP packages
APPLICATIONS
T Microprocessor Systems
T Portable Equipment
T Controllers
T Single Board Computers
T Instrumentations
T Telecommunications
FUNCTIONAL DIAGRAM
© Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
For Ordering Information details, see page 11.
— CAT1232LP for 5V supply
— CAT1832 for 3.3V supply
150ms, 600ms or 1.2s
— Active high, push-pull reset output
— Active low, open-drain reset output
— Active low, push-pull reset output (CAT1832)
(CAT1232LP)
PBRST
TOL
V
TD
ST
CC
40k
V
CC
Tolerance Selection
Watchdog Timebase Selection
Watchdog Transition Detector
Push Button Debounce
Reference
+
1
DESCRIPTION
The CAT1232LP
supervisors can halt and restart a “hung-up” or
“stalled” microprocessor, restart a microprocessor
after a power failure, and debounce a manual/push-
button microprocessor reset switch. The devices are
drop
Semiconductor DS1232LP and DS1832 supervisors
Precision reference and comparator circuits monitor
the 5V or 3.3V system power supply voltage, V
During power-up or when the power supply falls
outside selectable tolerance limits, both the RESET
and RESET
voltage rises above the RESET threshold voltage, the
reset signals remain active for a minimum of 250ms,
allowing the power supply and system processor to
stabilize. The trip-point tolerance input, TOL, selects
the trip level tolerance to be either 5% or 10% for the
CAT1232LP 5V supply and 10% or 20% for the
CAT1832 3.3V supply.
Each device has a push-pull, active HIGH reset
output.
active LOW reset output while the CAT1832 also has
a push-pull, active LOW reset output.
A debounced manual reset input activates the reset
outputs and holds them active for a minimum period of
250ms after being released.
Also included is a watchdog timer to reset a
microprocessor that has stopped due to a software or
hardware failure. Three watchdog time-out periods are
selectable: 150ms, 600ms and 1.2s. If the ST
not strobed low before the watchdog time out period
expires, the reset signals become active for a
minimum of 250ms.
Watchdog Timer
Reset &
¯¯¯¯¯¯ become active. After the power supply
in
The CAT1232LP also has an open drain,
replacements
CAT1232, CAT1832
and CAT1832
for
(CAT1232LP)
(CAT1832)
the
Doc. No. MD-3018 Rev. D
RESET
RESET
RESET
microprocessor
Maxim/Dallas
¯¯ input is
CC
.

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cat1232 Summary of contents

Page 1

... The trip-point tolerance input, TOL, selects the trip level tolerance to be either 5% or 10% for the CAT1232LP 5V supply and 10% or 20% for the CAT1832 3.3V supply. Each device has a push-pull, active HIGH reset output. ...

Page 2

... TD = GND 600ms for TD = Open 1200ms for CAT1232LP TOL selects 5% (TOL = GND) or 10% (TOL = V TOL point tolerance. CAT1832 TOL selects 10% (TOL = GND) or 20% TOL = V ) trip point tolerance. CC GND Ground Active HIGH reset output. RESET is active ...

Page 3

... V Slew Rate R CC Notes: ¯¯¯¯¯¯ is internally pulled HIGH to V (1) PBRST CC ¯¯¯¯¯¯ open drain output on the CAT1232LP. (2) RESET (3) RESET remains within 0. power-down until falls below 2.0V. CC (4) Must not exceed the minimum watchdog time-out period (t strobed ...

Page 4

... CAT1232, CAT1832 TYPICAL CHARACTERISTICS For the CAT1232LP and T CC Threshold Voltage vs. Temperature (10% TOL) 4.450 4.445 TOL = Vcc (10%) 4.440 4.435 4.430 -50 0 TEMPERATURE (°C) Supply Current vs. Temperature 40 Vcc = 5.5V 30 Vcc = 4. -50 0 TEMPERATURE (°C) Reset Active Time Waveform Doc. No. MD-3018 Rev 25ºC unless otherwise stated. ...

Page 5

... Reset Signal Polarity and Output Stage Structure ¯¯¯¯¯¯ active LOW signal developed with RESET an open drain driver in the CAT1232LP. A pull-up resistor is required, typical values are 10kŸ to 50kŸ. The CAT1832 uses a CMOS push-pull output stage ¯ ...

Page 6

... CAT1232LP 1 PBRST TOL RESET 4 GND RESET Figure 5. CAT1232LP Application Circuit: Watchdog Timer t PB PBRST t PDLY V IL RESET RESET Figure 6. Timing Diagram: Pushbutton Reset Doc. No. MD-3018 Rev Voltage Level GND ¯ ...

Page 7

... For current Tape and Reel information, download the PDF file from: http://www.catsemi.com/documents/tapeandreel.pdf. Notes: (1) All dimensions are in millimeters. (2) Complies with JEDEC MS-013. © Catalyst Semiconductor, Inc. Characteristics subject to change without notice SYMBOL CAT1232, CAT1832 MIN NOM MAX 2.36 2.49 2.64 0.10 0.30 0.33 0.41 0.51 0.18 0.23 0.28 10.08 10.31 10.49 10.01 10.31 10.64 7.39 7.49 7.59 1.27 BSC 0.25 ...

Page 8

... CAT1232, CAT1832 (1)(2) PDIP 8-Lead 300mils (L) PIN # 1 IDENTIFICATION D TOP VIEW SIDE VIEW For current Tape and Reel information, download the PDF file from: http://www.catsemi.com/documents/tapeandreel.pdf. Notes: (1) All dimensions are in millimeters. (2) Complies with JEDEC MS-001. Doc. No. MD-3018 Rev. D SYMBOL ...

Page 9

... Notes: (1) All dimensions are in millimeters. Angles in degrees. (2) Complies with JEDEC MO-187. © Catalyst Semiconductor, Inc. Characteristics subject to change without notice SYMBOL END VIEW DETAIL A 9 CAT1232, CAT1832 MIN NOM MAX 1. 10 0.05 0.10 0.15 0.75 0.85 0.95 0.22 0.38 0.13 0.23 2.90 3.00 3.10 4.80 4.90 5.00 2.90 3.00 3.10 0.65 BSC ...

Page 10

... CAT1232, CAT1832 (1)(2) SOIC 8-Lead 150mils (W) PIN # 1 IDENTIFICATION TOP VIEW SIDE VIEW For current Tape and Reel information, download the PDF file from: http://www.catsemi.com/documents/tapeandreel.pdf. Notes: (1) All dimensions are in millimeters. Angles in degrees. (2) Complies with JEDEC MS-012. Doc. No. MD-3018 Rev. D SYMBOL A A1 ...

Page 11

... All packages are RoHS-compliant (Lead-free, Halogen-free). (2) The standard lead finish is NiPdAu. (3) The device used in the above example is a CAT1232LPV-GT3 (SOIC 8-Lead, NiPdAu, Tape & Reel). (4) For additional package and temperature options, please contact your nearest Catalyst Semiconductor Sales office. (5) The SOIC 16-Lead package is only available in Matte-Tin finish. ...

Page 12

... Catalyst Semiconductor products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the Catalyst Semiconductor product could create a situation where personal injury or death may occur. ...

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