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PDF MAX6803 Data sheet ( Hoja de datos )
| Número de pieza | MAX6803 | |
| Descripción | 4-Pin / Low-Power P Reset Circuits with Manual Reset | |
| Fabricantes | Maxim Integrated | |
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MAX6803/MAX6804/
MAX6805
4-Pin, Low-Power
µP Reset Circuits 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 cir-
cuit reliability and reduce cost by eliminating external
components and adjustments. They also feature a
debounced manual-reset input.
These devices perform a single function: they assert a
reset signal whenever the VCC supply voltage declines
below a preset threshold or whenever manual reset is
asserted. Reset remains asserted for a preset timeout
period after VCC has 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 RESET output, while the MAX6803 (push/pull) has
an active-high RESET output. The MAX6803/MAX6804
are guaranteed to be in the correct state for VCC down
to 0.7V. The MAX6805 is guaranteed to be in the correct
state for VCC down 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
Typical Operating Circuit and Pin Configuration appear
at end of data sheet.
Selector Guide appears at end of data sheet.
Features
●● Ultra-Low 0.7V Operating Supply Voltage
●● Low 4.0µA Supply Current
●● Precision 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 Input
●● Fully Specified over Temperature
●● Three Power-On Reset Timeout Periods Available
(1ms min, 20ms min, 100ms min)
●● Low Cost
●● Three Available Output Structures: Push/Pull
RESET, Push/Pull RESET, Open-Drain RESET
●● Guaranteed RESET/RESET Valid to VCC = 0.7V
(MAX6803/MAX6804)
●● Power-Supply Transient Immunity
●● No External Components Required
●● 4-Pin SOT143 Package
●● Pin Compatible with MAX811/MAX812 and
MAX6314/MAX6315(
Ordering Information
PART*
TEMP RANGE PIN-PACKAGE
MAX6803US_ _D_-T -40°C to +125°C 4 SOT143
MAX6804US_ _D_-T -40°C to +125°C 4 SOT143
MAX6805US_ _D_-T -40°C to +125°C 4 SOT143
*These devices
olds from 2.63V
are available in factory-set
to 4.80V, in approximately
V0.C1CV
reset thresh-
increments.
Choose the desired reset threshold suffix from Table 1 and
insert it in the blanks following “US” in the part number.
Factory-programmed reset timeout periods are also available.
Insert the number corresponding to the desired nominal reset
timeout period (1 = 1ms min, 2 = 20ms min, 3 = 100ms min) in
the blank following “D” in the part number. There are 15 stan-
dard versions with a required order increment of 2500 pieces.
Sample stock is generally held on the standard versions only
(see Selector Guide). Contact the factory for availability of non-
standard versions (required order increment is 10,000 pieces).
All devices available in tape-and-reel only.
Devices are available in both leaded and lead-free packaging.
Specify lead-free by replacing “-T” with “+T” when ordering.
19-1946; Rev 3; 7/14
1 page  
MAX6803/MAX6804/
MAX6805
4-Pin, Low-Power
µP Reset Circuits with Manual Reset
µPs and circuitry do not operate when VCC drops below
1V. For the MAX6804 application where RESET must
be valid down to 0, adding a pulldown resistor between
RESET and GND removes stray leakage currents,
holding RESET low (Figure 2a). The pulldown resistor
value is not critical; 100kΩ is 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 100kΩ pullup
resistor between RESET and VCC will hold RESET high
when VCC falls 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,
RESET will most likely not maintain an active condi-
tion, 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 RESET pin is required to
be valid down to VCC = 0.
VCC
MAX6804
MR RESET
(a) GND
100kΩ
VCC
MAX6803
MR RESET
(b) GND
100kΩ*
Pin Configuration
TOP VIEW
GND 1
MAX6803
MAX6804
MAX6805
4 VCC
RESET (RESET) 2
3 MR
( ) ARE FOR MAX6803
SOT143
*ASSUMES HIGH-Z RESET INPUT TO THE µP
Figure 2. Ensuring Reset Valid down to VCC = 0
Typical Operating Circuit
VCC
VCC
MAX6804
MR RESET
VCC
µP
RESET
GND
PUSHBUTTON
SWITCH
GND
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5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet MAX6803.PDF ] | |
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