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CAT1832Z-GT3 Fiches technique(PDF) 1 Page - ON Semiconductor |
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CAT1832Z-GT3 Fiches technique(HTML) 1 Page - ON Semiconductor |
1 / 12 page CAT1232LP, CAT1832 © 2009 SCILLC. All rights reserved. 1 Doc. No. MD-3018 Rev. F Characteristics subject to change without notice 5 V and 3.3 V Supply Monitor, Watchdog Timer, Manual Reset, with Active High & Low Resets FEATURES Selectable reset voltage tolerance — CAT1232LP for 5 V supply — CAT1832 for 3.3 V supply Selectable watchdog period: 150 ms, 600 ms or 1.2 s Two reset outputs — Active high, push-pull reset output — Active low, open-drain reset output (CAT1232LP) — Active low, push-pull reset output (CAT1832) Debounced manual push-button reset Compact SOIC and MSOP packages For Ordering Information details, see page 11. APPLICATIONS Microprocessor Systems Portable Equipment Controllers Single Board Computers Instrumentations Telecommunications FUNCTIONAL DIAGRAM DESCRIPTION The CAT1232LP and CAT1832 microprocessor 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 in replacements for the Maxim/Dallas Semiconductor DS1232LP and DS1832 supervisors Precision reference and comparator circuits monitor the 5 V or 3.3 V system power supply voltage, VCC. During power-up or when the power supply falls outside selectable tolerance limits, both the RESET and RESET ¯¯¯¯¯¯ become active. After the power supply 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 5 V supply and 10% or 20% for the CAT1832 3.3 V supply. Each device has a push-pull, active HIGH reset output. The CAT1232LP also has an open drain, 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 250 ms 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: 150 ms, 600 ms and 1.2 s. If the ST ¯¯ input is not strobed low before the watchdog time out period expires, the reset signals become active for a minimum of 250 ms. ST RESET PBRST 40kΩ TOL VCC – + Reference VCC RESET TD Push Button Debounce Watchdog Timebase Selection Reset & Watchdog Timer (CAT1232LP) Watchdog Transition Detector RESET (CAT1832) Tolerance Selection |
Numéro de pièce similaire - CAT1832Z-GT3 |
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Description similaire - CAT1832Z-GT3 |
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