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MAX6734KAYHD3-T Datasheet(PDF) 1 Page - Maxim Integrated Products |
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MAX6734KAYHD3-T Datasheet(HTML) 1 Page - Maxim Integrated Products |
1 / 16 page General Description The MAX6730–MAX6735 single-/dual-/triple-voltage microprocessor (µP) supervisors feature a watchdog timer and manual reset capability. The MAX6730– MAX6735 offer factory-set reset thresholds for monitor- ing voltages from +0.9V to +5V and an adjustable reset input for monitoring voltages down to +0.63V. The com- bination of these features significantly improves system reliability and accuracy when compared to separate ICs or discrete components. The active-low reset output asserts and remains asserted for the reset timeout period after all the monitored volt- ages exceed their respective thresholds. Multiple factory- set reset threshold combinations reduce the number of external components required. The MAX6730/MAX6731 monitor a single fixed voltage, the MAX6732/MAX6733 monitor two fixed voltages, and the MAX6734/MAX6735 monitor two fixed voltages and one adjustable voltage. All devices are offered with six minimum reset timeout peri- ods ranging from 1.1ms to 1120ms. The MAX6730–MAX6735 feature a watchdog timer with an independent watchdog output. The watchdog timer prevents system lockup during code execution errors. A watchdog startup delay of 54s after reset asserts allows system initialization during power-up. The watch- dog operates in normal mode with a 1.68s delay after initialization. The MAX6730/MAX6732/MAX6734 provide an active-low, open-drain watchdog output. The MAX6731/MAX6733/MAX6735 provide an active-low, push-pull watchdog output. Other features include a manual reset input (MAX6730/ MAX6731/MAX6734/MAX6735) and push-pull reset out- put (MAX6731/MAX6733/MAX6735) or open-drain reset output (MAX6730/MAX6732/MAX6734). The MAX6730– MAX6733 are offered in a tiny SOT23-6 package. The MAX6734/MAX6735 are offered in a space-saving SOT23-8 package. All devices are fully specified over the extended temperature range (-40°C to +85°C). Applications Multivoltage Systems Telecom/Networking Equipment Computers/Servers Portable/Battery-Operated Equipment Industrial Equipment Printer/Fax Set-Top Boxes Features o VCC1 (Primary Supply) Reset Threshold Voltages from +1.575V to +4.63V o VCC2 (Secondary Supply) Reset Threshold Voltages from +0.79V to +3.08V o Adjustable RSTIN Threshold for Monitoring Voltages Down to +0.63V (MAX6734/MAX6735 Only) o Six Reset Timeout Options o Watchdog Timer with Independent Watchdog Output 35s (min) Initial Watchdog Startup Period 1.12s (min) Normal Watchdog Timeout Period o Manual Reset Input (MAX6730/MAX6731/MAX6734/MAX6735) o Guaranteed Reset Valid down to VCC1 or VCC2 = +0.8V o Push-Pull RESET or Open-Drain RESET Output o Immune to Short VCC Transients o Low Supply Current: 14µA (typ) at +3.6V o Small 6-Pin and 8-Pin SOT23 Packages Single-/Dual-/Triple-Voltage µP Supervisory Circuits with Independent Watchdog Output ________________________________________________________________ Maxim Integrated Products 1 Ordering Information 19-2629; Rev 2; 1/03 For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. *Note: Insert the threshold level suffixes for VCC1 and VCC2 (Table 1) after “UT” or “KA.” For the MAX6730/MAX6731, insert only the VCC1 threshold suffix after the “UT.” Insert the reset timeout delay (Table 2) after “D” to complete the part number. For example, the MAX6732UTLTD3-T provides a VCC1 threshold of +4.625V, a VCC2 threshold of +3.075V, and a 210ms reset timeout period. Sample stock is generally held on standard ver- sions only (see the Standard Versions table). Standard versions have an order increment requirement of 2500 pieces. Nonstandard versions have an order increment requirement of 10,000 pieces. Contact factory for availability. PART* TEMP RANGE PIN-PACKAGE MAX6730 UT_D_ -T -40°C to +85°C 6 SOT23-6 MAX6731 UT_D_ -T -40°C to +85°C 6 SOT23-6 MAX6732 UT_ _D_ -T -40°C to +85°C 6 SOT23-6 MAX6733 UT_ _D_ -T -40°C to +85°C 6 SOT23-6 MAX6734 KA_ _D_ -T -40°C to +85°C 8 SOT23-8 MAX6735 KA_ _D_ -T -40°C to +85°C 8 SOT23-8 Typical Operating Circuit and Pin Configurations appear at end of data sheet. |
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