Maxim MAX16055 Ultra-small, hex voltage, microprocessor supervisor Datasheet

19-4411; Rev 0; 1/09
Ultra-Small, Hex Voltage,
Microprocessor Supervisor
The MAX16055 precision hex voltage microprocessor
(µP) supervisory circuit monitors up to six system-supply voltages and asserts a single reset when any one
supply voltage drops below its preset threshold. The
device significantly reduces system size and component count while improving reliability compared to multiple ICs or discrete components.
A variety of factory-trimmed threshold voltages are available to accommodate different supply voltages and tolerance 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 threshold. 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 available in a small 10-pin µMAX® (3mm x 3mm) package.
The MAX16055 operates over the -40°C to +125°C
automotive temperature range.
Features
o 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
o Adjustable Voltage Threshold Monitors Down to
0.5V with 1.5% Accuracy
o Open-Drain RESET Output with 70µA Internal
Pullup
o Fixed 140ms (min) Reset Timeout Period
o Manual Reset Input
o Reset Valid for IN1 ≥ 1V or IN2 ≥ 1V
o Tolerance Select (5%/10%) Input
o Immune to Short Supply Transients
Ordering Information
PART
TEMP RANGE
PIN-PACKAGE
MAX16055_AUB+*
-40°C to +125°C
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
Networking Equipment
High-End Printers
Industrial Equipment
Desktop and Notebook
Computers
Set-Top Boxes
Typical Operating Circuit
Servers/Workstations
Data Storage Equipment
MAX16055
µMAX is a registered trademark of Maxim Integrated Products, Inc.
10kΩ
IN1
Pin Configuration
0.1µF
MONITORED
SUPPLIES
TOP VIEW
IN1 1
IN2
2
IN3
3
IN4
IN5
+
10 GND
9
RESET
8
MR
4
7
TOL
5
6
IN6
MAX16055
VCC
µP
RESET
IN2
IN3
IN4
IN5
IN6
MR
GND TOL
µMAX
________________________________________________________________ Maxim Integrated Products
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
MAX16055
General Description
MAX16055
Ultra-Small, Hex Voltage,
Microprocessor Supervisor
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
(VIN1 = 1V to 5.5V, TA = -40°C to +125°C, unless otherwise noted. Typical values are at VIN1 = 3.3V, TA = +25°C.) (Note 1)
PARAMETER
Operating Voltage Range
Input Current (Note 3)
SYMBOL
VIN1
IIN_
CONDITIONS
(Note 2)
2
VTH
TYP
1.0
MAX
UNIT
5.5
V
VIN_ = 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)
25
40
VIN1 = nominal input voltage (for +3.3V IN1
supply)
55
115
VIN_ = 0 to 0.5V or VADJ (for adjustable
thresholds)
Threshold Voltage
MIN
VIN_ decreasing
-0.1
µA
+0.1
3.3V, TOL = GND
3.00
3.08
3.15
3.3V, TOL = VIN1
2.85
2.93
3.00
3.0V, TOL = GND
2.70
2.78
2.85
3.0V , TOL = VIN1
2.55
2.63
2.70
2.5V, TOL = GND
2.25
2.32
2.38
2.5V, TOL = VIN1
2.13
2.19
2.25
1.8V, TOL = GND
1.62
1.67
1.71
1.8V, TOL = VIN1
1.53
1.58
1.62
1.5V, TOL = GND
1.355
1.389
1.425
1.5V, TOL = VIN1
1.283
1.316
1.350
1.2V, TOL = GND
1.084
1.112
1.140
1.2V, TOL = VIN1
1.027
1.053
1.08
1.1V, TOL = GND
0.993
1.019
1.045
1.1V, TOL = VIN1
0.941
0.965
0.99
1.0V, TOL = GND
0.903
0.926
0.95
1.0V, TOL = VIN1
0.856
0.878
0.90
0.9V , TOL = GND
0.813
0.834
0.855
0.9V, TOL = VIN1
0.770
0.790
0.810
_______________________________________________________________________________________
V
Ultra-Small, Hex Voltage,
Microprocessor Supervisor
(VIN1 = 1V to 5.5V, TA = -40°C to +125°C, unless otherwise noted. Typical values are at VIN1 = 3.3V, TA = +25°C.) (Note 1)
PARAMETER
Adjustable Threshold
Reset Threshold Hysteresis
SYMBOL
VTH
VHYST
CONDITIONS
VIN_ decreasing
MIN
tRD
Reset Timeout Period
tRP
0.491
0.5
0.506
TOL = VCC
0.465
0.472
0.479
VIN_ increasing relative to VIN_ decreasing
VIN_ falling at 10mV/µs from (VTH + 50mV)
to (VTH - 50mV)
140
VOL
60
ppm/°C
20
µs
200
0.4
RESET Output High Source
Current
IOH
VIN1 > 2.55V, RESET not asserted
0.8 x
VIN1
VIL
MR, TOL Input Voltage High
VIH
MR Minimum Pulse Width
70
100
nA
0.3 x
VIN1
V
V
1
µs
100
MR-to-RESET Delay
200
Note 1:
Note 2:
Note 3:
Note 4:
µA
0.7 x
VIN1
MR Glitch Rejection
MR Pullup Resistance
V
V
TOL = IN1
MR, TOL Input Voltage Low
ms
0.3
0.3
VIN1 > 2.55V, ISOURCE = 6µA (min), RESET
not asserted
TOL Input Current
280
VIN1 = 1.0V, ISINK = 50µA
VOH
V
%VTH
VIN1 = 2.5V, ISINK = 1.2mA
RESET Output High
UNIT
0.3
VIN1 = 5V, ISINK = 2mA
RESET Output Low (Note 4)
MAX
TOL = GND
Reset Threshold Temperature
Coefficient
IN_ to Reset Delay
TYP
10
20
ns
ns
33
kΩ
100% production tested at TA = +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
MAX16055
ELECTRICAL CHARACTERISTICS (continued)
Typical Operating Characteristics
(VIN1 = 3.3V, TA = +25°C, unless otherwise noted.)
NORMALIZED THRESHOLD ERROR
vs. TEMPERATURE
IN1 INPUT CURRENT (µA)
60
50
40
30
20
10
0.8
0.6
0.4
0.2
0
-0.2
-0.4
-0.6
-0.8
-1.0
0
-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
TEMPERATURE (°C)
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
RESET PROPAGATION DELAY
vs. RESET THRESHOLD OVERDRIVE
(IN_ DECREASING)
RESET PULLUP AND PULLDOWN
RESPONSE (CL = 47pF)
70
60
50
RESET
ASSERTS ABOVE THIS LINE
40
30
20
100
90
10
MAX16055 toc06
MAX16055 toc05
MAX16055 toc04
80
80
IN_
100mV/div
AC-COUPLED
70
60
50
40
RESET
2V/div
30
20
10
0
0
0 100 200 300 400 500 600 700 800 900 1000
0 100 200 300 400 500 600 700 800 900 1000
IN_ OVERDRIVE (mV)
MR-TO-RESET PROPAGATION DELAY
vs. TEMPERATURE
204
202
200
198
196
194
MAX16055 toc08
210
200
190
MR-TO-RESET DELAY (ns)
RESET THRESHOLD (ms)
206
VIN_ = 3.3V
MAX16055 toc07
210
208
20µs/div
IN_ OVERDRIVE (mV)
RESET TIMEOUT PERIOD
vs. TEMPERATURE
180
170
160
150
140
130
120
192
110
190
100
-40 -25 -10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
4
MAX16055 toc03
MAX16055 toc02
70
1.0
NORMALIZED THRESHOLD ERROR (%)
80
MAX16055 toc01
70
68
66
64
62
60
58
56
54
52
50
48
46
44
42
40
IN1 INPUT CURRENT
vs. IN1 VOLTAGE
RESET PROPAGATION DELAY (µs)
IN1 INPUT CURRENT (µA)
IN1 INPUT CURRENT
vs. TEMPERATURE
MAXIMUM IN_ TRANSIENT DURATION (µs)
MAX16055
Ultra-Small, Hex Voltage,
Microprocessor Supervisor
VIN_ = 3.3V
-40 -25 -10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
_______________________________________________________________________________________
Ultra-Small, Hex Voltage,
Microprocessor Supervisor
RESET TIMEOUT DELAY
MR-TO-RESET PROPAGATION DELAY
MAX16055 toc09
MAX16055 toc10
VIN = 3.3V
IN_
1V/div
MR
2V/div
RESET
1V/div
RESET
2V/div
40ms/div
40ns/div
Pin Description
PIN
NAME
FUNCTION
1
IN1
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.
2
IN2
Voltage Input 2. See the Selector Guide for voltage threshold. Keep IN1 or IN2 > 1V to ensure RESET is valid.
3
IN3
Voltage Input 3. See the Selector Guide for voltage threshold.
4
IN4
Voltage Input 4. See the Selector Guide for voltage threshold.
5
IN5
Voltage Input 5. See the Selector Guide for voltage threshold.
6
IN6
Voltage Input 6. See the Selector Guide for voltage threshold.
7
TOL
Threshold Tolerance Input. Connect TOL to GND to select thresholds 5% below nominal. Connect TOL to IN1
to select thresholds 10% below nominal.
8
MR
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.
9
RESET
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.
10
GND
Ground
_______________________________________________________________________________________
5
MAX16055
Typical Operating Characteristics (continued)
(VIN1 = 3.3V, TA = +25°C, unless otherwise noted.)
MAX16055
Ultra-Small, Hex Voltage,
Microprocessor Supervisor
ALL DEVICES ARE POWERED FROM IN1 (3.3V/2.5V); RESET IS VALID IF VIN1 OR VIN2 IS GREATER THAN 1V
IN1
3.3V
IN2
ADJ
IN1
IN2
PULLUP
70µA
IN3
ADJ
TIMEOUT
(200ms)
RESET
IN4
1.8V
UVLO
IN5
ADJ
IN6
ADJ
IN1
TOL
REF
MAX16055C
MR
Figure 1. Functional Diagram
Detailed Description
The MAX16055 hex voltage µP supervisory circuit maintains system integrity in multisupply systems (Figure 1).
The MAX16055 offers accurate, factory-fixed undervoltage threshold options for monitoring very low voltages.
The MAX16055 also offers one to five adjustable thresholds for monitoring voltages down to 0.5V. See the
Selector Guide for the available threshold options.
6
The MAX16055 includes an accurate voltage reference,
precision comparators, and a series of accurate internal
resistor-divider networks to set the factory-fixed reset
threshold options for monitoring 3.3V, 3.0V, 2.5V, 1.8V,
1.5V, 1.2V, 1.1V, 1.0V, or 0.9V supplies. The resistor
networks scale the specified IN_ threshold voltages to
match the internal reference voltage. Adjustable threshold options allow the monitored voltage to be connected
to the input of the internal comparator. Use an external
voltage-divider to set the threshold voltage.
_______________________________________________________________________________________
Ultra-Small, Hex Voltage,
Microprocessor Supervisor
Reset Output
The MAX16055 RESET output asserts low when any
monitored IN_ voltage drops below the specified reset
threshold. RESET remains low for the reset timeout period of 140ms (min) after all inputs rise above the
respective thresholds (Figure 2). The RESET output is
open drain with a weak internal pullup to the monitored
IN1 supply (70µA typ). For many applications, no external pullup resistor is required to interface with other
logic devices. Apply an external pullup resistor to any
voltage from 0 to 5.5V when interfacing to different
logic-supply voltages (Figure 3). Internal circuitry prevents reverse current flow from the external pullup voltage into the RESET output when RESET is not asserted.
RESET asserts low upon power-up. After all IN_ inputs
rise above the respective threshold voltages, RESET
remains low for the reset timeout period (Figure 4)
before going high.
IN1 powers the MAX16055 and is also a monitored voltage. When any monitored supply drops below the
threshold voltage, RESET asserts low and remains low
while either IN1 or IN2 is above 1.0V.
Adjustable Thresholds
The MAX16055 includes monitor options with
adjustable reset thresholds. The threshold voltage at
each adjustable IN_ input is typically 0.5V. To monitor a
voltage higher than 0.5V, connect a resistor-divider network to the circuit as shown in Figure 5:
VINTH = 0.5V x (R1 + R2)/R2
Therefore:
R1 = R2 ((VINTH/0.5V) - 1)
Use high valued resistors (~ 100kΩ) to minimize current
through the external resistors. Use lower valued resistors for greater accuracy. The MAX16055 includes an
internal voltage clamp (1.5V typ) at each of the
adjustable voltage inputs. An input voltage higher than
1.5V induces a higher input current.
+5V
+3.3V
IN_
VTH_ + VHYST
VTH_
VCC
IN1
10kΩ
RESET
RESET
RESET
µP
90%
10%
MAX16055
tRD
tRP
GND
Figure 2. RESET Output Timing Diagram
GND
Figure 3. Interfacing with External Logic-Supply Voltage
_______________________________________________________________________________________
7
MAX16055
The MAX16055 is immune to short IN_ transients. Each
of the internal comparators provides a typical hysteresis of 0.3% with respect to the reset threshold. This
built-in hysteresis improves the monitor’s immunity to
ambient noise without significantly reducing threshold
accuracy. See the Typical Operating Characteristics for
a glitch immunity graph labeled Maximum IN_ Transient
Duration vs. Reset Threshold Overdrive.
MAX16055
Ultra-Small, Hex Voltage,
Microprocessor Supervisor
VINTH
VIN1
VIN2
VTH + VHYST
MAX16055
R1
VIN3
VIN4
VIN5
R2
VIN6
VTH
tRP
RESET
tRP BEGINS
WHEN THE LAST
SUPPLY EXCEEDS
ITS VTH + VHYST
Figure 4. RESET Output with Various Input Voltages
R1 = R2
( VVINTH
-1)
TH
Figure 5. Setting the Adjustable Threshold
Manual-Reset Input (MR)
Applications Information
Many µP-based products require manual-reset capability. A logic-low on MR asserts RESET low. RESET
remains asserted while MR is low, and during the reset
timeout period (140ms, min) after MR returns high. The
MR input has an internal 20kΩ pullup resistor to IN1.
Connect a normally open momentary switch from MR to
GND to create a manual-reset function. Connect a
0.1µF capacitor from MR to GND to provide additional
noise immunity when driving MR from long cables or
when the device is used in a noisy environment.
Connect unused monitor inputs to a supply voltage
higher than the specified threshold voltage. Connect a
100kΩ resistor between an unused adjustable input
and IN1 to limit the bias current. Use IN1 for normal
operation (device power supply). Do not connect
unused monitor inputs to ground. Do not leave unused
monitor inputs unconnected.
Tolerance (TOL)
The MAX16055 features an adjustable threshold tolerance. Connect TOL to GND to set the threshold voltages 5% below the nominal value. Connect TOL to IN1
to set the threshold voltages 10% below the nominal
value. See the Electrical Characteristics table. Do not
leave TOL unconnected.
Unused Inputs
Reset Output Pullup Resistor
When connecting a pullup resistor from RESET to a
voltage rail lower than the voltage on IN1, the internal
70µA pullup current flows through the pullup resistor,
causing the voltage at RESET to be higher than the voltage rail when RESET is deasserted. Ensure that the
value of the pullup resistor is low enough that the voltage rise does not cause problems.
Power-Supply Bypassing and Grounding
IN1 powers the MAX16055. Connect a 0.1µF bypass
capacitor from IN1 to ground. All monitored inputs are
immune to short supply transients. Add bypass capacitors from IN2–IN6 to GND to improve noise immunity.
8
_______________________________________________________________________________________
Ultra-Small, Hex Voltage,
Microprocessor Supervisor
PART*
(SUFFIX IN BOLD)
NOMINAL INPUT VOLTAGE (V)
IN1
IN2
IN3
IN4
IN5
IN6
MAX16055A
3.3
2.5
1.5
1.8
1.2
0.9
MAX16055B
3.3
3.0
1.8
1.5
1.1
1.0
MAX16055C
3.3
ADJ
ADJ
1.8
ADJ
ADJ
MAX16055D
3.3
ADJ
1.5
ADJ
ADJ
ADJ
MAX16055E
3.3
2.5
ADJ
1.8
ADJ
ADJ
MAX16055F
3.3
2.5
1.5
ADJ
ADJ
ADJ
MAX16055G
3.3
2.5
ADJ
ADJ
ADJ
ADJ
MAX16055H
3.3
ADJ
ADJ
ADJ
ADJ
ADJ
MAX16055I
2.5
ADJ
ADJ
ADJ
ADJ
ADJ
MAX16055J
3.3
3.3
2.5
1.2
1.5
1.2
*Adjustable voltage is based on the 0.5V internal threshold. External threshold voltage can be set using an external resistor-divider.
(VADJ = 0.500V typ).
Package Information
Chip Information
PROCESS: BiCMOS
For the latest package outline information and land patterns, go
to www.maxim-ic.com/packages.
PACKAGE TYPE
PACKAGE CODE
DOCUMENT NO.
10 µMAX
U10+2
21-0061
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.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 _____________________ 9
© 2009 Maxim Integrated Products
is a registered trademark of Maxim Integrated Products, Inc.
MAX16055
Selector Guide