19-1145; Rev 3; 11/05
5-Pin, Multiple-Input,
Programmable Reset ICs
General Description
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.
Features
♦
Small 5-Pin SOT23 Package
♦
Precision Factory-Set V
CC
Reset Thresholds;
Available in 0.1V Increments from 2.5V to 5V
♦
Immune to Short V
CC
Transients
♦
Guaranteed RESET Valid to V
CC
= 1V
♦
Guaranteed Over Temperature
♦
8µA Supply Current
♦
Factory-Set Reset Timeout Delay from
1ms (min) to 1120ms (min)
♦
No External Components
♦
Manual Reset Input
♦
Under/Overvoltage Supply Monitoring
MAX6305–MAX6313
Ordering Information
PART
†
MAX6305UK00D_-T
MAX6306UK_
_D_-T
TEMP. RANGE
0°C to +70°C
0°C to +70°C
PIN-PACKAGE
5 SOT23-5
5 SOT23-5
Applications
Portable Computers
Computers
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 V
CC
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-
ADDITIONAL
NEGATIVE/
MANUAL-
SET RESET
UNDERVOLTAGE OVERVOLTAGE
RESET
THRESHOLD
RESET INPUTS
RESET INPUT
INPUT
ON V
CC
—
✔
✔
—
✔
✔
—
✔
✔
2
1
1
2
1
1
2
1
1
—
—
✔
—
—
✔
—
—
✔
—
✔
—
—
✔
—
—
✔
—
1
________________________________________________________________
Maxim Integrated Products
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
5-Pin, Multiple-Input,
Programmable Reset ICs
MAX6305–MAX6313
ABSOLUTE MAXIMUM RATINGS
V
CC
...........................................................................-0.3V to +6V
All Other Pins..............................................-0.3V to (V
CC
+ 0.3V)
Input/Output Current, All Pins .............................................20mA
Rate of Rise, V
CC
............................................................100V/µs
Continuous Power Dissipation (T
A
= +70°C)
SOT23-5 (derate 7.1mW/°C above +70°C).................571mW
Operating Temperature Range...............................0°C to +70°C
Storage Temperature Range .............................-65°C to +160°C
Lead Temperature (soldering, 10sec) .............................+300°C
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.
ELECTRICAL CHARACTERISTICS
V
CC
= +2.5V to +5.5V for the MAX6305/MAX6308/MAX6311, V
CC
= (V
TH
+ 2.5%) to +5.5V for the MAX6306/MAX6307/MAX6309/
MAX6310/MAX6312/MAX6313; T
A
= 0°C to +70°C; unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
V
CC
Range
Supply Current
Reset Threshold
(Note 2)
Reset Threshold
Tempco
Reset Threshold
Hysteresis
I
CC
V
TH
SYMBOL
V
CC
= 5.5V
MAX6306/MAX6307/
MAX6309/MAX6310/
MAX6312/MAX6313
T
A
= +25°C
T
A
= 0°C to +70°C
V
TH
- 1.5%
V
TH
- 2.5%
40
2 x V
TH
D1
Reset Timeout Period
t
RP
D2
D3
D4
V
CC
> 4.25V, I
SINK
= 3.2mA
V
CC
> 2.5V, I
SINK
= 1.2mA
V
OL
RESET
Output
Voltage
MAX6305–MAX6310
T
A
= 0°C to +70°C,
V
CC
> 1.2V, I
SINK
= 500µA
T
A
= 0°C to +70°C,
V
CC
> 1.0V, I
SINK
= 50µA
MAX6308/MAX6309/
MAX6310
V
CC
> 4.25V,
I
SOURCE
= 800µA
V
CC
> 2.5V,
I
SOURCE
= 500µA
V
CC
> 4.25V, I
SINK
= 3.2mA
V
CC
> 2.5V, I
SINK
= 1.2mA
MAX6311/MAX6312/
MAX6313
V
OH
V
CC
> 1.8V,
I
SOURCE
= 150µA
T
A
= 0°C to +70°C,
V
CC
> 1.0V, I
SOURCE
= 10µA
0.8 x V
CC
0.8 x V
CC
V
CC
- 1.5
0.8 x V
CC
0.4
0.3
V
1
20
140
1120
1.4
28
200
1570
2
40
280
2240
0.4
0.3
0.3
0.3
V
ms
CONDITIONS
T
A
= 0°C to +70°C (Note 1)
MIN
1.0
8
V
TH
TYP
MAX
5.5
16
V
TH
+ 1.5%
V
V
TH
+ 2.5%
ppm/°C
mV
UNITS
V
µA
∆V
TH
/°C
V
TH
HYST
V
OH
V
OL
RESET Output
Voltage
2
_______________________________________________________________________________________
5-Pin, Multiple-Input,
Programmable Reset ICs
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= +2.5V to +5.5V for the MAX6305/MAX6308/MAX6311, V
CC
= (V
TH
+ 2.5%) to +5.5V for the MAX6306/MAX6307/MAX6309/
MAX6310/MAX6312/MAX6313; T
A
= 0°C to +70°C; unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
SYMBOL
V
IL
MR
Input
V
IH
V
IL
V
IH
MR
Minimum Input
Pulse
MR
Glitch Rejection
MR
to Reset Delay
MR
Pull-Up Resistance
ADJUSTABLE RESET COMPARATOR INPUTS
RST IN Input Threshold
RST IN Input Current
RST IN Hysteresis
V
RSTH
I
RST IN_
T
A
= +25°C
T
A
= 0°C to +70°C
0V < V
RST IN_
< V
CC
- 0.3V
1.21
1.20
-25
2.5
1.23
1.25
1.26
25
V
nA
mV
32
CONDITIONS
MIN
0.8
2.4
0.3 x V
CC
0.7 x V
CC
1
0.1
500
63.5
100
µs
µs
nsV
kΩ
V
TYP
MAX
UNITS
MAX6305–MAX6313
MANUAL-RESET INPUT (MAX6306/MAX6309/MAX6312)
V
TH
> 4.0V
V
TH
< 4.0V
Note 1:
The MAX6305/MAX6308/MAX6311 switch from undervoltage reset to normal operation between 1.5V < V
CC
< 2.5V.
Note 2:
The MAX6306/MAX6307/MAX6309/MAX6310/MAX6312/MAX6313 monitor V
CC
through an internal factory-trimmed voltage
divider, which programs the nominal reset threshold. Factory-trimmed reset thresholds are available in approximately
100mV increments from 2.5V to 5V (Table 1).
_______________________________________________________________________________________
3
5-Pin, Multiple-Input,
Programmable Reset ICs
MAX6305–MAX6313
__________________________________________Typical Operating Characteristics
(V
CC
= +5V, T
A
= +25°C, unless otherwise noted.)
OVRST IN RISING PROPAGATION
DELAY vs. TEMPERATURE
(OVERVOLTAGE RESET INPUT)
6305 TOC02
6305 TOC03
SUPPLY CURRENT
vs. TEMPERATURE
9.0
SUPPLY CURRENT (µA)
8.5
8.0
7.5
7.0
6.5
6.0
5.5
5.0
-60
-40
-20
0
20
40
60
80
100
TEMPERATURE (°C)
V
CC
= 2.5V
V
CC
= 3.5V
V
CC
= 4.5V
V
CC
= 5.5V
6305 TOC01
V
CC
FALLING PROPAGATION DELAY
vs. TEMPERATURE
80
70
PROPAGATION DELAY (ns)
60
50
40
30
20
10
0
-60
-40
-20
0
20
40
60
80
100
TEMPERATURE (°C)
10mV
µs
1mV
µs
70
60
PROPAGATION DELAY (ns)
50
40
30
20
10
0
-60
9.5
1mV
µs
10mV
µs
-40
-20
0
20
40
60
80
100
TEMPERATURE (°C)
RST IN_ FALLING PROPAGATION
DELAY vs. TEMPERATURE
6305 TOC04
RESET TIMEOUT
vs. TEMPERATURE
6305 TOC05
RESET THRESHOLD
vs. TEMPERATURE
NORMALIZED RESET THRESHOLD (V/V)
1.008
1.006
1.004
1.002
1.000
0.998
0.996
0.994
0.992
0.990
-60
-40
-20
0
20
40
60
80
100
6305 TOC06
120
RST IN_ PROPAGATION DELAY (ns)
100
80
60
40
20
0
-60
-40
-20
0
20
40
60
80
10mV
µs
1.10
1.08
NORMALIZED RESET TIMEOUT
1.06
1.04
1.02
1.00
0.98
0.96
0.94
0.92
0.90
1.010
1mV
µs
100
-60
-40
-20
0
20
40
60
80
100
TEMPERATURE (°C)
TEMPERATURE (°C)
TEMPERATURE (°C)
MAXIMUM TRANSIENT DURATION vs.
V
CC
RESET THRESHOLD OVERDRIVE
6305 TOC7
MAXIMUM TRANSIENT DURATION vs.
OVRST IN THRESHOLD OVERDRIVE
6305 TOC8
MAXIMUM TRANSIENT DURATION vs.
RST IN_ THRESHOLD OVERDRIVE
RESET OCCURS ABOVE LINES
TRANSIENT DURATION (µs)
1000
6305 TOC9
10,000
RESET OCCURS ABOVE LINES
TRANSIENT DURATION (µs)
1000
V
TH
= 5.0V
100
10,000
RESET OCCURS ABOVE LINES
TRANSIENT DURATION (µs)
1000
10,000
100
V
TH
= 5.0V
100
V
TH
= 5.0V
V
TH
= 3.0V
10
V
TH
= 2.5V
10
V
TH
= 3.0V
10
1
0
400
800
1200
OVERDRIVE, V
TH
- V
CC
(mV)
1
0
400
800
1200
OVERDRIVE, V
OVRST IN
- V
REF
(mV)
1
0
400
800
1200
OVERDRIVE, V
REF
- V
RST IN
(mV)
4
_______________________________________________________________________________________
5-Pin, Multiple-Input,
Programmable Reset ICs
______________________________________________________________Pin Description
PIN
MAX6305
MAX6308
MAX6311
MAX6306
MAX6309
MAX6312
MAX6307
MAX6310
MAX6313
NAME
FUNCTION
MAX6305–MAX6313
RESET
1
1
1
RESET
2
—
2
3
2
—
GND
MR
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 V
CC
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 V
CC
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 V
CC
through an internal factory-
trimmed resistor divider to the reset comparator.
3, 4
—
—
—
4
—
—
3
4
RST IN1,
RST IN2
RST IN
OVRST IN
5
5
5
V
CC
_______________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 V
CC
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 V
CC
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 V
CC
> 1V (see
Electrical
Characteristics).
Once all monitored voltages exceed
their programmed reset thresholds, an internal timer
keeps reset asserted for the reset timeout period (t
RP
);
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
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