19-2242; Rev 1; 1/02
Ultra-Low-Voltage SC70 Voltage Detectors
and µP Reset Circuits
General Description
Features
ꢀ Factory-Set Reset Threshold Voltages for
The MAX6832–MAX6840 are microprocessor (µP)
supervisory circuits used to monitor low-voltage power
supplies in µP and digital systems. They provide excel-
lent circuit reliability and low cost by eliminating exter-
nal components and adjustments when used with
+1.2V to +1.8V powered circuits.
Nominal Supplies from 1.2V to 1.8V
ꢀ Low Power Consumption: 7.5µA (typ)
ꢀ Space-Saving 3- and 4-Pin SC70 Packages
ꢀ
2.5ꢀ Reset Threshold Accuracy ꢁver
Temperature
These devices assert a reset signal whenever the V
CC
supply voltage declines below a preset threshold or
ꢀ Five Different Timeout Periods Available: 70µs
whenever manual reset (MR) is asserted. Reset remains
(voltage detector), 1.5ms, 30ms, 210ms, and 1.68s
asserted for a fixed timeout delay after V
has risen
CC
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.
ꢀ Three Reset ꢁutput Configurations
Push-Pull RESET
Push-Pull RESET
ꢁpen-Drain RESET
ꢀ Guaranteed Reset Valid to V
0.55V—Active-Low
=
CC
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 resis-
0.75V—Active-High
ꢀ Adjustable Threshold Reset-In ꢁption
ꢀ Manual Reset Input ꢁption
tor that can be connected to a voltage higher than V
.
CC
ꢀ Immune to Short Negative V
Transients
CC
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 compara-
ꢀ Pin Compatible with MAX803/MAX809/MAX810,
MAX6711/MAX6712/MAX6713, and
MAX6381–MAX6390 Series
tor is designed to ignore fast transients on V
.
CC
Ordering Information
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.
PART
TEMP. RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
3 SC70-3
3 SC70-3
3 SC70-3
4 SC70-4
4 SC70-4
4 SC70-4
4 SC70-4
4 SC70-4
4 SC70-4
MAX6832_XRD_-T
MAX6833_XRD_-T
MAX6834_XRD_-T
MAX6835_XSD_-T
MAX6836_XSD_-T
MAX6837_XSD_-T
MAX6838XSD_-T
MAX6839XSD_-T
MAX6840XSD_-T
Applications
Computers
Controllers
Intelligent Instruments
Critical µP and µC Power Monitoring
Portable/Battery-Powered Equipment
Insert the desired suffix letter from the Threshold Suffix Guide
(MAX6832–MAX6837) and the Active Timeout Period Guide
tables into the blanks to complete the part number. Sample
stock is generally available on standard versions only (see
Standard Versions table). Standard versions require a minimum
order increment of 2.5k units. Nonstandard versions must be
ordered in 10k unit increments. Contact factory for availability.
All parts are offered in tape-and-reel only.
Pin Configurations appear at end of data sheet.
Typical Operating Circuit apears at end of data sheet.
Selector Guide appears at end of data sheet.
________________________________________________________________ Maxim Integrated Products
1
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.
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