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Part Number: MAX6838
Description: The MAX6832MAX6840 are microprocessor (µP) supervisory circuits used to monitor low-voltage power supplies in &mi...
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MAX6838
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DataSheet
General Description
MAX6838 General Description
The MAX6832MAX6840 are microprocessor (µP) supervisory circuits used to monitor low-voltage power supplies in µP and digital systems. They provide excellent circuit reliability and low cost by eliminating external components and adjustments when used with +1.2V to +1.8V powered circuits.
These devices assert a reset signal whenever the VCC supply voltage declines below a preset threshold or whenever manual reset (MR) is asserted. Reset remains asserted for a fixed timeout delay after VCC has risen above the reset threshold or when manual reset is deasserted. Five different timeout periods are available: 70µs (voltage detector), 1.5ms, 30ms, 210ms, and 1.68s. Reset thresholds suitable for operation with a variety of supply voltages are available.
The MAX6832/MAX6835/MAX6838 have a push-pull active-low reset output (RESET ). The MAX6833/ MAX6836/MAX6839 have a push-pull active-high reset output (RESET ) and the MAX6834/MAX6837/MAX6840 have an open-drain active-low reset output (RESET ). The open-drain active-low reset output requires a pullup resistor that can be connected to a voltage higher than VCC.
The MAX6835/MAX6836/MAX6837 feature a debounced manual reset input (MR ), while the MAX6838/MAX6839/ MAX6840 provide a RESET-IN input allowing the user to externally adjust the reset threshold. The reset comparator is designed to ignore fast transients on VCC.
Low supply current of 7.5µA makes the MAX6832 MAX6840 ideal for use in portable equipment. These devices are available in 3- and 4-pin SC70 packages.
MAX6838 Maximum Ratings
VCC.............................................................................................-0.3V to +6.0V
Open-Drain RESET, MR ...............................................................-0.3V to +6.0V
RESET-IN, Push-Pull RESET and RESET .............................-0.3V to (VCC + 0.3V)
Input/Output Current (all pins) .................................................................20mA
3-Pin SC70 (derate 2.9mW/°C above +70°C)......................................235mW
4-Pin SC70 (derate 3.1mW/°C above +70°C)......................................245mW
Operating Temperature Range ...............................................-40°C to +85°C
Junction Temperature............................................................................+150°C
Storage Temperature Range .................................................-65°C to +150°C
Lead Temperature (soldering, 10s) .......................................................+300°C
Open-Drain RESET, MR ...............................................................-0.3V to +6.0V
RESET-IN, Push-Pull RESET and RESET .............................-0.3V to (VCC + 0.3V)
Input/Output Current (all pins) .................................................................20mA
3-Pin SC70 (derate 2.9mW/°C above +70°C)......................................235mW
4-Pin SC70 (derate 3.1mW/°C above +70°C)......................................245mW
Operating Temperature Range ...............................................-40°C to +85°C
Junction Temperature............................................................................+150°C
Storage Temperature Range .................................................-65°C to +150°C
Lead Temperature (soldering, 10s) .......................................................+300°C
MAX6838 Features
`Factory-Set Reset Threshold Voltages for Nominal Supplies from 1.2V to 1.8V
`Low Power Consumption: 7.5µA (typ)
`Space-Saving 3- and 4-Pin SC70 Packages
`±2.5% Reset Threshold Accuracy Over Temperature
`Five Different Timeout Periods Available: 70µs (voltage detector), 1.5ms, 30ms, 210ms, and 1.68s
`Three Reset Output Configurations Push-Pull RESET Push-Pull RESET Open-Drain RESET
`Guaranteed Reset Valid to VCC = 0.55V-Active-Low 0.75V-Active-High
`Adjustable Threshold Reset-In Option
`Manual Reset Input Option
`Immune to Short Negative VCC Transients
`Pin Compatible with MAX803/MAX809/MAX810, MAX6711/MAX6712/MAX6713, and MAX6381MAX6390 Series
`Low Power Consumption: 7.5µA (typ)
`Space-Saving 3- and 4-Pin SC70 Packages
`±2.5% Reset Threshold Accuracy Over Temperature
`Five Different Timeout Periods Available: 70µs (voltage detector), 1.5ms, 30ms, 210ms, and 1.68s
`Three Reset Output Configurations Push-Pull RESET Push-Pull RESET Open-Drain RESET
`Guaranteed Reset Valid to VCC = 0.55V-Active-Low 0.75V-Active-High
`Adjustable Threshold Reset-In Option
`Manual Reset Input Option
`Immune to Short Negative VCC Transients
`Pin Compatible with MAX803/MAX809/MAX810, MAX6711/MAX6712/MAX6713, and MAX6381MAX6390 Series
MAX6838 Typical Application
·Computers
·Controllers
·Intelligent Instruments
·Critical µP and µC Power Monitoring
·Portable/Battery-Powered Equipment
·Controllers
·Intelligent Instruments
·Critical µP and µC Power Monitoring
·Portable/Battery-Powered Equipment
MAX6838 Connection Diagram
MAX6838
PDF/DataSheet Download
- Datasheet: MAX6838
- File Size: 202065 KB
- Manufacturer: Maxim
- Click here to Download
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