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PDF MAX6305 Data sheet ( Hoja de datos )
| Número de pieza | MAX6305 | |
| Descripción | Programmable Reset ICs | |
| Fabricantes | Maxim Integrated | |
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19-1145; Rev 6; 7/12
5-Pin, Multiple-Input,
Programmable Reset ICs
General Description
Features
The MAX6305–MAX6313 CMOS microprocessor (µP)
supervisory circuits are designed to monitor more than
one power supply. Ideal for monitoring both 5V and
3.3V in personal computer systems, these devices
assert a system reset if any of the monitored supplies
falls outside the programmed threshold. Low supply
current (15µA) and a small package suit them for
portable applications. The MAX6305–MAX6313 are
specifically designed to ignore fast transients on
any monitored supply.
These devices are available in a SOT23-5 package,
have factory-programmed reset thresholds from 2.5V to
5.0V (in 100mV increments), and feature four power-on
reset timeout periods. Ten standard versions are avail-
able. Contact the factory for availability of non standard
versions.
Applications
o Small 5-Pin SOT23 Package
o Precision Factory-Set VCC Reset Thresholds;
Available in 0.1V Increments from 2.5V to 5V
o Immune to Short VCC Transients
o Guaranteed RESET Valid to VCC = 1V
o Guaranteed Over Temperature
o 8µA Supply Current
o Factory-Set Reset Timeout Delay from
1ms (min) to 1120ms (min)
o No External Components
o Manual Reset Input
o Under/Overvoltage Supply Monitoring
Ordering Information
PART†
TEMP RANGE
PIN-
PACKAGE
Portable Computers
MAX6305UK00D_-T
-0°C to +70°C 5 SOT23
Computers
MAX6305EUK00D_-T
-40°C to +85°C 5 SOT23
Controllers
Intelligent Instruments
Portable/Battery-Powered Equipment
Multivoltage Systems: 3V/5V, 5V/12V, 5V/24V
Embedded Control Systems
Pin Configurations and Typical Operating Circuit appear at
end of data sheet.
Ordering Information continued at end of data sheet.
Standard Versions Table appears at end of data sheet.
† The MAX6306/MAX6307/MAX6309/MAX6310/MAX6312/
MAX6313 are available with factory-set VCC reset thresholds from
2.5V to 5V, in 0.1V increments. Insert the desired nominal reset
threshold (from Table 1) into the blanks following the letters UK.
All parts also offer factory-programmed reset timeout periods.
Insert the number corresponding to the desired nominal timeout
period index following the “D” in the part number (D1 = 1ms min,
D2 = 20ms min, D3 = 140ms min, and D4 = 1120ms min). There
are 10 standard versions with a required order increment of 2,500
pieces. Sample stock is generally held on the standard versions
only (see Standard Versions table). Required order increment is
10,000 pieces for non-standard versions. Contact factory for
availability of non-standard versions. 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.
_______________________________________________________________Selector Table
PART
MAX6305
MAX6306
MAX6307
MAX6308
MAX6309
MAX6310
MAX6311
MAX6312
MAX6313
OPEN-DRAIN
RESET
OUTPUT
—
—
—
—
—
—
PUSH/PULL
RESET
OUTPUT
—
—
—
—
—
—
PUSH/PULL
RESET
OUTPUT
—
—
—
—
—
—
FACTORY-
SET RESET
THRESHOLD
ON VCC
—
—
—
ADDITIONAL
UNDERVOLTAGE
RESET INPUTS
2
1
1
2
1
1
2
1
1
NEGATIVE/
OVERVOLTAGE
RESET INPUT
—
—
—
—
—
—
MANUAL-
RESET
INPUT
—
—
—
—
—
—
For pricing, delivery, and ordering information, please contact Maxim Direct
at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
1
1 page  
5-Pin, Multiple-Input,
Programmable Reset ICs
______________________________________________________________Pin Description
MAX6305
MAX6308
MAX6311
1
2
—
3, 4
—
—
5
PIN
MAX6306
MAX6309
MAX6312
1
2
3
—
4
—
5
MAX6307
MAX6310
MAX6313
1
2
—
—
3
4
5
NAME
FUNCTION
RESET
RESET
GND
MR
RST IN1,
RST IN2
RST IN
OVRST IN
VCC
Active-Low, Open-Drain Reset Output for the MAX6305/MAX6306/
MAX6307. Active-Low, Push/Pull Reset Output (sources and sinks
current) for the MAX6308/MAX6309/MAX6310.
Active-High, Push/Pull Reset Output for the MAX6311/MAX6312/MAX6313
System Ground
Manual-Reset Input. Pull low to force a reset. RESET/RESET remains
active as long as MR is low and for the timeout period after MR
goes high. Leave unconnected or connect to VCC if unused.
Undervoltage Reset Comparator Input. Asserts reset when the
monitored voltage falls below the programmed threshold. Set the
reset threshold with an external resistor divider. Connect to VCC if
unused.
Overvoltage Reset Comparator Input. Asserts reset when the monitored
voltage exceeds the programmed threshold. Set the reset threshold
with an external resistor divider. Connect to GND if unused.
System Supply. The MAX6306/MAX6307/MAX6309/MAX6310/
MAX6312/MAX6313 also monitor VCC through an internal factory-
trimmed resistor divider to the reset comparator.
_______________Detailed Description
The MAX6305–MAX6313 CMOS microprocessor (µP)
supervisory circuits are designed to monitor more than
one power supply and issue a system reset when any
monitored supply falls out of regulation. The MAX6305/
MAX6308/MAX6311 have two adjustable undervoltage
reset inputs (RST IN1 and RST IN2). The MAX6306/
MAX6307/MAX6309/MAX6310/MAX6312/MAX6313 mon-
itor VCC through an internal, factory-trimmed voltage
divider. The MAX6306/MAX6309/MAX6312 have, in
addition, an adjustable undervoltage reset input and a
manual-reset input. The internal voltage divider sets the
reset threshold as specified in the device part number
(Table 1). The MAX6307/MAX6310/ MAX6313 feature an
adjustable undervoltage reset input (RST IN) and an
adjustable overvoltage reset input (OVRST IN) in addition
to the factory-trimmed reset threshold on the VCC moni-
tor. Program the adjustable reset inputs with an external
resistor divider (see Adjustable Reset Inputs section).
Reset Outputs
A µP’s reset input starts the µP in a known state. These
µP supervisory circuits assert reset to prevent code-
execution errors during power-up, power-down, or
brownout conditions.
RESET (MAX6305–MAX6310) and RESET (MAX6311/
MAX6312/MAX6313) are guaranteed to be asserted at
a valid logic level for VCC > 1V (see Electrical
Characteristics). Once all monitored voltages exceed
their programmed reset thresholds, an internal timer
keeps reset asserted for the reset timeout period (tRP);
after this interval, reset deasserts.
If a brownout condition occurs (any or all monitored volt-
ages dip outside their programmed reset threshold),
reset asserts (RESET goes high; RESET goes low). Any
time any of the monitored voltages dip below their reset
threshold, the internal timer resets to zero and reset
asserts. The internal timer starts when all of the moni-
tored voltages return above their reset thresholds, and
reset remains asserted for a reset timeout period. The
MAX6305/MAX6306/MAX6307 feature an active-low,
5
5 Page 
5-Pin, Multiple-Input,
Programmable Reset ICs
Revision History
REVISION REVISION
NUMBER DATE
DESCRIPTION
0 9/96 Initial release
1 8/98 Make corrections to EC table and Figures 1 and 8.
2
4/99
Added Standard Versions Table and note to the Ordering Information table. Text
added to the General Description.
3 11/05 Added lead-free option to the Ordering Information table.
4 12/07 Updated Table 2 and Package Outline.
5
4/08
Added MAX6305E–MAX6313E to Ordering Information table, updated Electrical
Characteristics table and global conditions, updated Table 1, and removed Table 2.
6 7/12 Updated the Electrical Characteristics table.
PAGES
CHANGED
—
3, 6, 8
1, 13
1, 13
9, 10, 14
1, 2, 3, 8–15
2
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. The parametric values (min and max limits) shown in
the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance.
Maxim Integrated Products, Inc. 160 Rio Robles, San Jose, CA 95134 USA 1-408-601-1000 ________________ 11
© 2012 Maxim Integrated Products
Maxim is a registered trademark of Maxim Integrated Products, Inc.
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet MAX6305.PDF ] | |
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