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MAX6804US29D3-T |MAX6804US29D3TMAXIMN/a8417avai2.93 V, low-power mP reset circuit with manual reset


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MAX6804US29D3-T
2.93 V, low-power mP reset circuit with manual reset
General Description
The MAX6803/MAX6804/MAX6805 microprocessor (µP)
supervisory circuits monitor the power supplies in 2.85V
to 5.0V µP and digital systems. They increase circuit
reliability and reduce cost by eliminating external com-
ponents and adjustments. They also feature a
debounced manual reset input.
These devices perform a single function: they assert a
reset signal whenever the VCCsupply voltage declines
below a preset threshold or whenever manual reset is
asserted. Reset remains asserted for a preset timeout
period after VCChas risen above the reset threshold or
after manual reset is deasserted. The only difference
among the three devices is their output. The MAX6804
(push/pull) and MAX6805 (open-drain) have an active-
low RESEToutput, while the MAX6803 (push/pull) has
an active-high RESET output. The MAX6803/MAX6804
are guaranteed to be in the correct state for VCCdown
to 0.7V. The MAX6805 is guaranteed to be in the cor-
rect state for VCCdown to 1.0V.
The reset comparator in these ICs is designed to ignore
fast transients on VCC. Reset thresholds are factory-
trimmable between 2.63V and 4.80V, in approximately
100mV increments. These devices are available with a
1ms min, 20ms min, or 100ms min reset timeout period.
Ideal for space-critical applications, the MAX6803/
MAX6804/MAX6805 come packaged in a 4-pin
SOT143. For a lower threshold voltage version, see the
MAX6335/MAX6336/MAX6337.
Applications

Computers
Controllers
Intelligent Instruments
Critical µP/µC Power Monitoring
Portable/Battery-Powered Equipment
Automotive
Features
Ultra-Low 0.7V Operating Supply VoltageLow 4.0µA Supply CurrentPrecision Monitoring of 2.85V to 5.0V Power-
Supply Voltages
Reset Thresholds Available from 2.63V to 4.80V,
in Approximately 100mV Increments
Debounced Manual Reset InputFully Specified over TemperatureThree Power-On Reset Timeout Periods Available
(1ms min, 20ms min, 100ms min)
Low CostThree Available Output Structures: Push/Pull
RESET, Push/Pull RESET, Open-Drain RESETGuaranteed RESET/RESETValid to VCC= 0.7V
(MAX6803/MAX6804)
Power-Supply Transient ImmunityNo External Components Required4-Pin SOT143 PackagePin Compatible with MAX811/MAX812 and
MAX6314/MAX6315
MAX6803/MAX6804/MAX6805
4-Pin, Low-Power
µP Reset Circuits with Manual Reset

19-1946; Rev 1; 2/01
Ordering Information
Typical Operating Circuit and Pin Configuration appear
at end of data sheet.
Selector Guide appears at end of data sheet.
MAX6803/MAX6804/MAX6805
4-Pin, Low-Power
µP Reset Circuits with Manual Reset
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS

(VCC= full range, TA= -40°C to +125°C, unless otherwise noted. Typical values are at VCC= +5.0V and TA= +25°C, reset not
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 +6V
Push/Pull RESET or RESET, MR............-0.3V to (VCC+ 0.3V)
Open-Drain RESET..............................................-0.3V to +6V
Input Current (VCC).............................................................20mA
Output Current (RESET, RESET).........................................20mA
Continuous Power Dissipation (TA= +70°C)
4-Pin SOT143 (derate 4mW/°C above +70°C)............320mW
Operating Temperature Range.........................-40°C to +125°C
Junction Temperature......................................................+150°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10s).................................+300°C
4-Pin, Low-Power
µP Reset Circuits with Manual Reset

SUPPLY CURRENT vs. TEMPERATURE
MAX6803/04/05 toc01
TEMPERATURE (°C)
ICC
NORMALIZED RESET TIMEOUT PERIOD
vs. TEMPERATURE
MAX6803/04/05 toc02
TEMPERATURE (°C)
NORMALIZED RESET TIMEOUT PERIOD
OUTPUT VOLTAGE LOW
vs. SUPPLY VOLTAGE
MAX6803/04/05 toc03
VCC (V)
OUTPUT VOLTAGE LOW (mV)
OUTPUT VOLTAGE HIGH
vs. SUPPLY VOLTAGE
MAX6803/04/05 toc04
VCC (V)
OUTPUT VOLTAGE HIGH (V
- V
) (mV)
MAXIMUM TRANSIENT DURATION
vs. RESET COMPARATOR OVERDRIVE
MAX6803/04/05 toc05
RESET COMPARATOR OVERDRIVE (mV)
MAXIMUM TRANSIENT DURATION (
VCC FALLING PROPAGATION DELAY
vs. TEMPERATURE
MAX6803/04/05 toc06
TEMPERATURE (°C)
POROPAGATION DELAY (
__________________________________________Typical Operating Characteristics

(Reset not asserted, TA= +25°C, unless otherwise noted.)
MAX6803/MAX6804/MAX6805
ELECTRICAL CHARACTERISTICS (continued)

(VCC= full range, TA= -40°C to +125°C, unless otherwise noted. Typical values are at VCC= +5.0V and TA= +25°C, reset not
Note 2:
ISOURCEfor the MAX6803 is 100nA; ISINKfor the MAX6804 is 100nA; ISINKfor the MAX6805 is 50µA.
MAX6803/MAX6804/MAX6805
4-Pin, Low-Power
µP Reset Circuits with Manual Reset
Pin Description
Applications Information
Manual Reset Input

Many µP-based products require manual reset capabil-
ity, allowing the operator, a test technician, or external
logic circuitry to initiate a reset. A logic low on MR
asserts reset. Reset remains asserted while MRis low,
and for the reset active timeout period after MRreturns
high. MRhas an internal 20kΩpullup resistor, so it can
be left unconnected if not used. Connect a normally
open momentary switch from MRto GND to create a
manual reset function; external debounce circuitry is
not required.
Interfacing to µPs with
Bidirectional Reset Pins

Since the RESEToutput on the MAX6805 is open-drain,
this device interfaces easily with µPs that have bidirec-
tional reset pins, such as the Motorola 68HC11.
Connecting the µP supervisor’s RESEToutput directly
to the microcontroller’s (µC’s) RESETpin with a single
pullup resistor allows either device to assert reset
(Figure 1).
Negative-Going VCCTransients

In addition to issuing a reset to the µP during power-up,
power-down, and brownout conditions, these devices
are relatively immune to short-duration, negative-going
VCCtransients (glitches). TheTypical Operating
Characteristicsshow the Maximum Transient Duration
vs. Reset Comparator Overdrive graph. The graph
shows the maximum pulse width that a negative-going
VCCtransient may typically have without issuing a reset
signal. As the amplitude of the transient increases, the
maximum allowable pulse width decreases.
Ensuring a Valid Reset Output
down to VCC = 0

When VCCfalls below 1V and approaches the minimum
operating voltage of 0.7V, push/pull-structured reset
sinking (or sourcing) capabilities decrease drastically.
High-impedance CMOS-logic inputs connected to the
RESETpin can drift to indeterminate voltages. This
does not present a problem in most cases, since most
4-Pin, Low-Power
µP Reset Circuits with Manual Reset
MAX6803/MAX6804/MAX6805

Figure 2. Ensuring Reset Valid down to VCC= 0
µPs and circuitry do not operate when VCCdrops below
1V. For the MAX6804 application where RESETmust be
valid down to 0, adding a pulldown resistor between
RESETand GND removes stray leakage currents, hold-
ing RESETlow (Figure 2a). The pulldown resistor value
is not critical; 100kΩis large enough not to load RESET,
and small enough to pull it low. For the MAX6803, where
RESET must be valid to VCC= 0, a 100kΩpullup resistor
between RESET and VCCwill hold RESET high when
VCCfalls below 0.7V (Figure 2b).
Since the MAX6805 has an open-drain, active-low out-
put, it typically uses a pullup resistor. With this device,
RESETwill most likely not maintain an active condition,
but will drift to a non-active level due to the pullup
resistor and the reduced sinking capability of the open-
drain device. Therefore, this device is not recommend-
ed for applications where the RESETpin is required to
be valid down to VCC= 0.
Typical Operating Circuit
MAX6803/MAX6804/MAX6805
4-Pin, Low-Power
µP Reset Circuits with Manual Reset
Table 1. Factory-Trimmed Reset Thresholds
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