19-4411; Rev 0; 1/09
Ultra-Small, Hex Voltage,
Microprocessor Supervisor
General Description
The MAX16055 precision hex voltage microprocessor
(µP) supervisory circuit monitors up to six system-sup-
ply voltages and asserts a single reset when any one
supply voltage drops below its preset threshold. The
device significantly reduces system size and compo-
nent count while improving reliability compared to multi-
ple ICs or discrete components.
A variety of factory-trimmed threshold voltages are avail-
able to accommodate different supply voltages and tol-
erance with minimal external components. The
MAX16055 includes internally fixed threshold options for
monitoring 3.3V, 3.0V, 2.5V, 1.8V, 1.5V, 1.2V, 1.1V, 1.0V,
and 0.9V supplies with -5% or -10% tolerance. The
MAX16055 is also available with one to five adjustable
threshold inputs to monitor voltages down to 0.5V.
A single active-low, open-drain output asserts when
any monitored input falls below its associated thresh-
old. The reset output features a weak internal pullup
(typically 70µA) to supply input IN1. The reset output
remains low for the reset timeout period (140ms, min)
after all voltages rise above the selected thresholds.
The reset output remains valid as long as either IN1 or
IN2 input voltage is above 1V. The MAX16055 is avail-
able in a small 10-pin µMAX
®
(3mm x 3mm) package.
The MAX16055 operates over the -40°C to +125°C
automotive temperature range.
Features
♦
Precision Factory-Set Reset Threshold Options
3.3V, 3.0V, 2.5V, 1.8V, 1.5V, 1.2V, 1.1V, 1.0V, and
0.9V
♦
Adjustable Voltage Threshold Monitors Down to
0.5V with 1.5% Accuracy
♦
Open-Drain
RESET
Output with 70µA Internal
Pullup
♦
Fixed 140ms (min) Reset Timeout Period
♦
Manual Reset Input
♦
Reset Valid for IN1
≥
1V or IN2
≥
1V
♦
Tolerance Select (5%/10%) Input
♦
Immune to Short Supply Transients
MAX16055
Ordering Information
PART
MAX16055_AUB+*
TEMP RANGE
-40°C to +125°C
PIN-PACKAGE
10 µMAX
+Denotes
a lead(Pb)-free/RoHS-compliant package.
*Insert
the desired threshold option letter from the Selector
Guide into the blank to complete the part number. Contact factory
for availability.
Applications
Telecommunications
High-End Printers
Desktop and Notebook
Computers
Data Storage Equipment
µMAX is a registered trademark of Maxim Integrated Products, Inc.
MAX16055
10kΩ
IN1
0.1μF
V
CC
μP
RESET
IN2
IN3
IN4
IN5
IN6
MR
GND TOL
Networking Equipment
Industrial Equipment
Set-Top Boxes
Servers/Workstations
Typical Operating Circuit
Pin Configuration
TOP VIEW
IN1 1
IN2
IN3
IN4
IN5
2
3
4
5
MONITORED
SUPPLIES
+
10 GND
9
RESET
MR
TOL
IN6
MAX16055
8
7
6
μMAX
________________________________________________________________
Maxim Integrated Products
1
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.
Ultra-Small, Hex Voltage,
Microprocessor Supervisor
MAX16055
ABSOLUTE MAXIMUM RATINGS
RESET,
TOL,
MR,
IN_ to GND ..................................-0.3V to +6V
Input/Output Current (all pins) ............................................20mA
Continuous Power Dissipation (TA = +70°C)
10-Pin µMAX (derate 5.6mW/°C above +70°C) ...........444mW
Operating Temperature Range .........................-40°C to +125°C
Storage Temperature Range .............................-65°C to +150°C
Junction Temperature ......................................................+150°C
Lead Temperature (soldering, 10s) .................................+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
IN1
= 1V to 5.5V, T
A
= -40°C to +125°C, unless otherwise noted. Typical values are at V
IN1
= 3.3V, T
A
= +25°C.) (Note 1)
PARAMETER
Operating Voltage Range
SYMBOL
V
IN1
(Note 2)
V
IN_
= nominal input voltage (for IN2–IN6;
3.3V, 3.0V, 2.5V, 1.8V, 1.5V, 1.2V, 1.1V,
1.0V, 0.9V supplies)
Input Current (Note 3)
I
IN_
V
IN1
= nominal input voltage (for +3.3V IN1
supply)
V
IN_
= 0 to 0.5V or V
ADJ
(for adjustable
thresholds)
3.3V, TOL = GND
3.3V, TOL = V
IN1
3.0V, TOL = GND
3.0V, TOL = V
IN1
2.5V, TOL = GND
2.5V, TOL = V
IN1
1.8V, TOL = GND
1.8V, TOL = V
IN1
Threshold Voltage
V
TH
V
IN_
decreasing
1.5V, TOL = GND
1.5V, TOL = V
IN1
1.2V, TOL = GND
1.2V, TOL = V
IN1
1.1V, TOL = GND
1.1V, TOL = V
IN1
1.0V, TOL = GND
1.0V, TOL = V
IN1
0.9V, TOL = GND
0.9V, TOL = V
IN1
-0.1
3.00
2.85
2.70
2.55
2.25
2.13
1.62
1.53
1.355
1.283
1.084
1.027
0.993
0.941
0.903
0.856
0.813
0.770
3.08
2.93
2.78
2.63
2.32
2.19
1.67
1.58
1.389
1.316
1.112
1.053
1.019
0.965
0.926
0.878
0.834
0.790
CONDITIONS
MIN
1.0
25
TYP
MAX
5.5
40
µA
UNIT
V
55
115
+0.1
3.15
3.00
2.85
2.70
2.38
2.25
1.71
1.62
1.425
1.350
1.140
1.08
1.045
0.99
0.95
0.90
0.855
0.810
V
2
_______________________________________________________________________________________
Ultra-Small, Hex Voltage,
Microprocessor Supervisor
ELECTRICAL CHARACTERISTICS (continued)
(V
IN1
= 1V to 5.5V, T
A
= -40°C to +125°C, unless otherwise noted. Typical values are at V
IN1
= 3.3V, T
A
= +25°C.) (Note 1)
PARAMETER
Adjustable Threshold
Reset Threshold Hysteresis
Reset Threshold Temperature
Coefficient
IN_ to Reset Delay
Reset Timeout Period
RESET
Output Low (Note 4)
t
RD
t
RP
V
IN1
= 5V, I
SINK
= 2mA
V
OL
V
IN1
= 2.5V, I
SINK
= 1.2mA
V
IN1
= 1.0V, I
SINK
= 50µA
RESET
Output High
RESET
Output High Source
Current
TOL Input Current
MR,
TOL Input Voltage Low
MR,
TOL Input Voltage High
MR
Minimum Pulse Width
MR
Glitch Rejection
MR-to-RESET
Delay
MR
Pullup Resistance
10
V
IL
V
IH
0.7 x
V
IN1
1
100
200
20
33
V
OH
I
OH
V
IN1
> 2.55V, I
SOURCE
= 6µA (min),
RESET
not asserted
V
IN1
> 2.55V,
RESET
not asserted
TOL = V
IN1
0.8 x
V
IN1
70
100
0.3 x
V
IN1
V
IN_
falling at 10mV/µs from (V
TH
+ 50mV)
to (V
TH
- 50mV)
140
SYMBOL
V
TH
V
HYST
CONDITIONS
V
IN_
decreasing
TOL = GND
TOL = V
IN1
MIN
0.491
0.465
TYP
0.5
0.472
0.3
60
20
200
280
0.3
0.4
0.3
V
µA
nA
V
V
µs
ns
ns
kΩ
V
MAX
0.506
0.479
UNIT
V
%V
TH
ppm/°C
µs
ms
MAX16055
V
IN_
increasing relative to V
IN_
decreasing
Note 1:
Note 2:
Note 3:
Note 4:
100% production tested at T
A
= +25°C. Limits over temperature guaranteed by design.
The devices are powered from IN1.
Monitored IN1 voltage is also the device power supply.
RESET
output is guaranteed to be in the correct state for IN1 or IN2 falling down to 1V.
_______________________________________________________________________________________
3
Ultra-Small, Hex Voltage,
Microprocessor Supervisor
MAX16055
Typical Operating Characteristics
(V
IN1
= 3.3V, T
A
= +25°C, unless otherwise noted.)
IN1 INPUT CURRENT
vs. TEMPERATURE
70
68
66
64
62
60
58
56
54
52
50
48
46
44
42
40
TEMPERATURE (°C)
MAX16055 toc01
IN1 INPUT CURRENT
vs. IN1 VOLTAGE
MAX16055 toc02
NORMALIZED THRESHOLD ERROR
vs. TEMPERATURE
NORMALIZED THRESHOLD ERROR (%)
0.8
0.6
0.4
0.2
0
-0.2
-0.4
-0.6
-0.8
-1.0
MAX16055 toc03
80
70
IN1 INPUT CURRENT (μA)
60
50
40
30
20
10
0
1.0
IN1 INPUT CURRENT (μA)
-40 -25 -10 5 20 35 50 65 80 95 110 125
0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
IN1 VOLTAGE (V)
-40 -25 -10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
MAXIMUM IN_ TRANSIENT DURATION
vs. RESET THRESHOLD OVERDRIVE
MAX16055 toc04
RESET PROPAGATION DELAY
vs. RESET THRESHOLD OVERDRIVE
(IN_ DECREASING)
90
RESET PROPAGATION DELAY (μs)
80
70
60
50
40
30
20
10
0
MAX16055 toc05
RESET PULLUP AND PULLDOWN
RESPONSE (C
L
= 47pF)
MAX16055 toc06
80
MAXIMUM IN_ TRANSIENT DURATION (μs)
70
60
50
40
30
20
10
0
RESET
ASSERTS ABOVE THIS LINE
100
IN_
100mV/div
AC-COUPLED
RESET
2V/div
0 100 200 300 400 500 600 700 800 900 1000
IN_ OVERDRIVE (mV)
0 100 200 300 400 500 600 700 800 900 1000
IN_ OVERDRIVE (mV)
20μs/div
RESET TIMEOUT PERIOD
vs. TEMPERATURE
MAX16055 toc07
MR-TO-RESET PROPAGATION DELAY
vs. TEMPERATURE
200
190
MR-TO-RESET DELAY (ns)
180
170
160
150
140
130
120
110
100
V
IN_
= 3.3V
-40 -25 -10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
MAX16055 toc08
210
208
206
RESET THRESHOLD (ms)
204
202
200
198
196
194
192
190
V
IN_
= 3.3V
210
-40 -25 -10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
4
_______________________________________________________________________________________
Ultra-Small, Hex Voltage,
Microprocessor Supervisor
Typical Operating Characteristics (continued)
(V
IN1
= 3.3V, T
A
= +25°C, unless otherwise noted.)
MAX16055
RESET TIMEOUT DELAY
MAX16055 toc09
MR-TO-RESET PROPAGATION DELAY
MAX16055 toc10
V
IN_
= 3.3V
IN_
1V/div
MR
2V/div
RESET
1V/div
RESET
2V/div
40ms/div
40ns/div
Pin Description
PIN
1
2
3
4
5
6
7
8
NAME
IN1
IN2
IN3
IN4
IN5
IN6
TOL
MR
FUNCTION
Voltage Input 1. IN1 is the power-supply input and voltage monitoring input for the device. Connect a 0.1µF
bypass capacitor from IN1 to GND. Keep IN1 or IN2 > 1V to ensure
RESET
is valid.
Voltage Input 2. See the
Selector Guide
for voltage threshold. Keep IN1 or IN2 > 1V to ensure
RESET
is valid.
Voltage Input 3. See the
Selector Guide
for voltage threshold.
Voltage Input 4. See the
Selector Guide
for voltage threshold.
Voltage Input 5. See the
Selector Guide
for voltage threshold.
Voltage Input 6. See the
Selector Guide
for voltage threshold.
Threshold Tolerance Input. Connect TOL to GND to select thresholds 5% below nominal. Connect TOL to IN1
to select thresholds 10% below nominal.
Active-Low Manual-Reset Input. When
MR
is low,
RESET
goes low and remains asserted for the reset timeout
period after
MR
is pulled high.
MR
is internally pulled high by a 20kΩ pullup resistor to IN1.
Active-Low Reset Output.
RESET
goes low when any input (IN_) goes below the specified threshold. After all
inputs rise above the specified threshold voltages,
RESET
remains low for 140ms (min) before going high.
The open-drain
RESET
output features a weak (70µA) internal pullup to IN1.
Ground
9
10
RESET
GND
_______________________________________________________________________________________
5
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