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MAX6834FXRD3-T |MAX6834FXRD3TMAXIMN/a2410avai1.050 V, 219 ms, ultra-low-voltage voltage detector and mP reset circuit
MAX6834HXRD3-T |MAX6834HXRD3TMAXN/a639avai1.313 V, 210 ms, ultra-low-voltage voltage detector and mP reset circuit
MAX6835FXSD0-T |MAX6835FXSD0TMAXN/a5000avai1.050 V, 0.07 ms, ultra-low-voltage voltage detector and mP reset circuit
MAX6837FXSD3-T |MAX6837FXSD3TMAXIMN/a7500avai1.050 V, 219 ms, ultra-low-voltage voltage detector and mP reset circuit
MAX6837HXSD3-T |MAX6837HXSD3TMAXIMN/a107avai1.313 V, 210 ms, ultra-low-voltage voltage detector and mP reset circuit


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MAX6834FXRD3-T-MAX6834HXRD3-T-MAX6835FXSD0-T-MAX6837FXSD3-T-MAX6837HXSD3-T
1.050 V, 0.07 ms, ultra-low-voltage voltage detector and mP reset circuit
General Description
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.
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 VCChas 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 resis-
tor 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 compara-
tor 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.
Applications

Computers
Controllers
Intelligent Instruments
Critical µP and µC Power Monitoring
Portable/Battery-Powered Equipment
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 OptionImmune to Short Negative VCCTransientsPin Compatible with MAX803/MAX809/MAX810,
MAX6711/MAX6712/MAX6713, and
MAX6381–MAX6390 Series
MAX6832–MAX6840
Ultra-Low-Voltage SC70 Voltage Detectors
and µP Reset Circuits
Ordering Information

19-2242; Rev 1; 1/02
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.

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.
MAX6832–MAX6840
Ultra-Low-Voltage SC70 Voltage Detectors
and µP Reset Circuits
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS

(VCC= +0.55V to +3.6V, TA= TMINto TMAX, unless otherwise noted. Typical values are at TA= +25°C.) (Note 1)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
Terminal Voltage (with respect to GND)
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
Continous Power Dissipation (TA= +70°C)
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
MAX6832–MAX6840
Ultra-Low-Voltage SC70 Voltage Detectors
and µP Reset Circuits
ELECTRICAL CHARACTERISTICS (continued)

(VCC= +0.55V to +3.6V, TA= TMINto TMAX, unless otherwise noted. Typical values are at TA= +25°C.) (Note 1)
Note 2:
Temperature range is from 0°C to +85°C.
MAX6832–MAX6840
Ultra-Low-Voltage SC70 Voltage Detectors
and µP Reset Circuits
Typical Operating Characteristics

(VCC= full range and TA= -40°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C).
MAX6832–MAX6840
Ultra-Low-Voltage SC70 Voltage Detectors
and µP Reset Circuits
MAX6832–MAX6840
Detailed Description
Reset Output

A microprocessor’s (µP’s) reset input starts the µP in a
known state. The MAX6832–MAX6840 assert a reset to
prevent code-execution errors during power-up, power-
down, or brownout conditions. They also assert a reset
signal whenever the VCCsupply voltage falls below a
preset threshold (MAX6832–MAX6837) or RESET-IN
falls below the adjustable threshold (MAX6838/
MAX6839/MAX6840), keeping reset asserted for a fixed
timeout delay (Table 2) after VCCor RESET-IN has risen
above the reset threshold. The MAX6832/MAX6835/
MAX6838 use a push-pull active-low output, the
MAX6833/MAX6836/MAX6839 have a push-pull active-
high output, and the MAX6834/MAX6837/MAX6840
have an open-drain active-low output stage. Connect a
pullup resistor on the MAX6834/MAX6837/MAX6840’sRESEToutput to any supply between 0 and 6V.
Manual Reset Input

Many µP-based systems require manual reset capabili-
ty, allowing the operator, a test technician, or external
logic circuitry to initiate a reset. Reset remains asserted
while MRis low, and for a fixed timeout delay after MR
returns high. This input has an internal 20kΩpullup
resistor, so it can be left open if it is not used. MRcan
be driven with CMOS logic level, or with open-drain/col-
lector outputs. To create a manual reset function, con-
nect a normally open momentary switch from MRto
ground; external debounce circuitry is not required. Ifis driven from long cables or if the device is used in
a noisy environment, connecting a 0.1µF capacitor fromto ground provides additional noise immunity.
RESET-IN Information

The MAX6838/MAX6839/MAX6840 feature a RESET-IN
input for monitoring supply voltages down to 0.44V. An
external resistive-divider network can be used to set
voltage monitoring thresholds as shown in Figure 1. As
the monitored voltage falls, the voltage at RESET-IN
decreases and asserts a reset when it falls below the
RESET-IN threshold (VRSTIN). The low-leakage current
Ultra-Low-Voltage SC70 Voltage Detectors
and µP Reset Circuits
Functional Diagrams

Figure 1. Setting the Adjustable Threshold Externally
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