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PDF MAX6337 Data sheet ( Hoja de datos )
| Número de pieza | MAX6337 | |
| Descripción | 4-Pin / Ultra-Low-Voltage / Low-Power P Reset Circuits with Manual Reset | |
| Fabricantes | Maxim Integrated | |
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Hay una vista previa y un enlace de descarga de MAX6337 (archivo pdf) en la parte inferior de esta página. Total 8 Páginas | ||
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19-1412; Rev 0; 12/98
4-Pin, Ultra-Low-Voltage, Low-Power
µP Reset Circuits with Manual Reset
General Description
The MAX6335/MAX6336/MAX6337 microprocessor (µP)
supervisory circuits monitor the power supplies in 1.8V
to 3.3V µP and digital systems. They increase circuit reli-
ability and reduce cost by eliminating external compo-
nents 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 MAX6336
(push/pull) and MAX6337 (open-drain) have an active-
low RESET output, while the MAX6335 (push/pull) has
an active-high RESET output. The MAX6335/MAX6336
are guaranteed to be in the correct state for VCC down
to 0.7V. The MAX6337 is guaranteed to be in the cor-
rect 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 1.6V and 2.5V, in approximately
100mV increments. There are 15 standard versions
available (2500 piece minimum-order quantity); contact
the factory for availability of nonstandard versions
(10,000 piece minimum-order quantity). For space-criti-
cal applications, the MAX6335/MAX6336/MAX6337
come packaged in a 4-pin SOT143.
Applications
Pentium II™ Computers
Computers
Controllers
Intelligent Instruments
Critical µP/µC Power Monitoring
Portable/Battery-Powered Equipment
Automotive
Typical Operating Circuit and Pin Configuration appear
at end of data sheet.
Selector Guide appears at end of data sheet.
Pentium II is a trademark of Intel Corp.
Features
o Ultra-Low 0.7V Operating Supply Voltage
o Low 3.3µA Supply Current
o Precision Monitoring of 1.8V and 2.5V Power-
Supply Voltages
o Reset Thresholds Available from 1.6V to 2.5V,
in Approximately 100mV Increments
o Debounced Manual Reset
o Fully Specified over Temperature
o Three Power-On Reset Pulse Widths Available
(1ms min, 20ms min, 100ms min)
o Low Cost
o Three Available Output Structures: Push/Pull
RESET, Push/Pull RESET, Open-Drain RESET
o Guaranteed RESET/RESET Valid to VCC = 0.7V
(MAX6335/MAX6336)
o Power-Supply Transient Immunity
o No External Components
o 4-Pin SOT143 Package
o Pin-Compatible with MAX811/MAX812 and
MAX6314/MAX6315
Ordering Information
PART*
MAX6335US__D_-T
MAX6336US__D_-T
MAX6337US__D_-T
TEMP. RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
4 SOT143
4 SOT143
4 SOT143
* These devices are available in factory-set VCC reset thresh-
olds from 1.6V to 2.5V, in approximately 0.1V 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.
________________________________________________________________ Maxim Integrated Products 1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
1 page  
4-Pin, Ultra-Low-Voltage, Low-Power
µP Reset Circuits with Manual Reset
VCC
MAX6336
MR RESET
(a) GND
100k
VCC
MAX6335
MR RESET
(b) GND
100k*
Table 1. Factory-Trimmed Reset
Thresholds*
RESET
THRESHOLD
SUFFIX
MAX633_US25D_
MAX633_US24D_
MAX633_US23D_
MAX633_US22D_
MAX633_US21D_
MAX633_US20D_
MAX633_US19D_
MAX633_US18D_
MAX633_US17D_
MAX633_US16D_
TA = +25°C
TA = -40°C to +85°C
MIN TYP MAX MIN
MAX
2.46 2.50 2.55 2.43
2.58
2.36 2.40 2.44 2.33
2.47
2.26 2.30 2.34 2.23
2.37
2.16 2.20 2.24 2.13
2.27
2.06 2.10 2.14 2.04
2.16
1.96 2.00 2.04 1.94
2.06
1.87 1.90 1.93 1.84
1.96
1.77 1.80 1.83 1.75
1.85
1.67 1.70 1.73 1.65
1.75
1.57 1.60 1.63 1.55
1.65
* Factory-trimmed reset thresholds are available in approximately
100mV increments, with a ±1.8% room-temperature variance.
*ASSUMES HIGH-Z RESET INPUT TO THE µP
Figure 2. Ensuring Reset Valid down to VCC = 0
(Figure 2a). The pull-down resistor value is not critical;
100kΩ is large enough not to load RESET, and small
enough to pull it low. For the MAX6335, where RESET
must be valid to VCC = 0, a 100kΩ pull-up resistor
between RESET and VCC will hold RESET high when
VCC falls below 0.7V (Figure 2b).
Since the MAX6337 has an open-drain, active-low out-
put, it typically uses a pull-up resistor. With this device,
RESET will most likely not maintain an active condition,
but will drift to a non-active level due to the pull-up
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.
_______________________________________________________________________________________ 5
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet MAX6337.PDF ] | |
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