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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX6726 Datasheet

Dual/Triple Ultra-Low-Voltage SOT23 P Supervisory Circuits

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19-2325; Rev 3; 6/03
Dual/Triple Ultra-Low-Voltage SOT23 µP
Supervisory Circuits
General Description
The MAX6715–MAX6729 are ultra-low-voltage microproces-
sor (µP) supervisory circuits designed to monitor two or three
system power-supply voltages. These devices assert a sys-
tem reset if any monitored supply falls below its factory-
trimmed or adjustable threshold and maintain reset for a
minimum timeout period after all supplies rise above their
thresholds. The integrated dual/triple supervisory circuits sig-
nificantly improve system reliability and reduce size com-
pared to separate ICs or discrete components.
These devices monitor primary supply voltages (VCC1) from
1.8V to 5.0V and secondary supply voltages (VCC2) from
0.9V to 3.3V with factory-trimmed reset threshold voltage
options (see Reset Voltage Threshold Suffix Guide). An
externally adjustable RSTIN input option allows customers to
monitor a third supply voltage down to 0.62V. These devices
are guaranteed to be in the correct reset output logic state
when either VCC1 or VCC2 remains greater than 0.8V.
A variety of push-pull or open-drain reset outputs along with
watchdog input, manual reset input, and power-fail input/out-
put features are available (see Selector Guide). Select reset
timeout periods from 1.1ms to 1120ms (min) (see Reset
Timeout Period Suffix Guide). The MAX6715–MAX6729 are
available in small 5, 6, and 8-pin SOT23 packages and oper-
ate over the -40°C to +85°C temperature range.
Applications
Multivoltage Systems
Telecom/Networking Equipment
Computers/Servers
Portable/Battery-Operated Equipment
Industrial Equipment
Printer/Fax
Set-Top Boxes
Typical Operating Circuit
UNREGULATED
DC
R1
R2
DC/DC OUT2
IN CONVERTER
OUT1
VCC1
VCC2
PUSHBUTTON
SWITCH
RSTIN/PFI
RST
WDI
MR PFO
MAX67_ _
1.8V 0.9V
I/O CORE
SUPPLY SUPPLY
RESET
I/O µP
NMI
Features
o VCC1 (primary supply) Reset Threshold Voltages
from 1.58V to 4.63V
o VCC2 (secondary supply) Reset Threshold
Voltages from 0.79V to 3.08V
o Externally Adjustable RSTIN Threshold for
Auxiliary/Triple-Voltage Monitoring
(0.62V internal reference)
o Watchdog Timer Option
35s (min) Long Startup Period
1.12s (min) Normal Timeout Period
o Manual Reset Input Option
o Power-Fail Input/Power-Fail Output Option
(Push-Pull and Open-Drain Active-Low)
o Guaranteed Reset Valid Down to VCC1 or
VCC2 = 0.8V
o Reset Output Logic Options
o Immune to Short VCC Transients
o Low Supply Current 14µA (typ) at 3.6V
o Small 5, 6, and 8-Pin SOT23 Packages
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
MAX6715UT_ _D_ -T -40°C to +85°C 6 SOT23-6
MAX6716UT_ _D_ -T -40°C to +85°C 6 SOT23-6
MAX6717UK_ _D_ -T -40°C to +85°C 5 SOT23-5
MAX6718UK_ _D_ -T -40°C to +85°C 5 SOT23-5
MAX6719UT_ _D_ -T -40°C to +85°C 6 SOT23-6
MAX6720UT_ _D_ -T -40°C to +85°C 6 SOT23-6
Note: The first “_ _” are placeholders for the threshold voltage
levels of the devices. Desired threshold levels are set by the part
number suffix found in the Reset Voltage Threshold Suffix Guide.
The “_” after the D is a placeholder for the reset timeout delay
time. Desired delay time is set using the timeout period suffix
found in the Reset Timeout Period Suffix Guide. For example the
MAX6716UTLTD3-T is a dual-voltage supervisor VTH1 = 4.625V,
VTH2 = 3.075V, and 210ms (typ) timeout period.
Ordering Information continued at end of data sheet.
Pin Configurations appear at end of data sheet.
Selector Guide appears at end of data sheet.
________________________________________________________________ Maxim Integrated Products 1
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.


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX6726 Datasheet

Dual/Triple Ultra-Low-Voltage SOT23 P Supervisory Circuits

No Preview Available !

Dual/Triple Ultra-Low-Voltage SOT23 µP
Supervisory Circuits
ABSOLUTE MAXIMUM RATINGS
Terminal Voltage (with respect to GND)
VCC1, VCC2 ..........................................................-0.3V to +6V
Open-Drain RST, RST1, RST2, PFO, RST ................-0.3V to +6V
Push-Pull RST, RST1, PFO, RST...............-0.3V to (VCC1 + 0.3V)
Push-Pull RST2 .........................................-0.3V to (VCC2 + 0.3V)
RSTIN, PFI, MR, WDI ................................................-0.3V to +6V
Input Current/Output Current (all pins) ...............................20mA
Continuous Power Dissipation (TA = +70°C)
5-Pin SOT23-5 (derate 7.1mW/°C above +70°C) ........571mW
6-Pin SOT23-6 (derate 8.7mW/°C above +70°C) ........696mW
8-Pin SOT23-8 (derate 8.9mW/°C above +70°C) ........714mW
Operating Temperature Range ...........................-40°C to +85°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
(VCC1 = VCC2 = 0.8V to 5.5V, GND = 0, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
Supply Voltage
Supply Current
VCC
ICC1
ICC2
VCC1 < 5.5V, all I/O pins open
VCC1 < 3.6V, all I/O pins open
VCC2 < 3.6V, all I/O pins open
VCC2 < 2.75V, all I/O pins open
L (falling)
M (falling)
T (falling)
0.8
4.500
4.250
3.000
15
10
4
3
4.625
4.375
3.075
5.5
39
28
11
9
4.750
4.500
3.150
V
µA
VCC1 Reset Threshold
VTH1
S (falling)
R (falling)
Z (falling)
2.850
2.550
2.250
2.925
2.625
2.313
3.000
2.700
2.375
V
Y (falling)
W (falling)
V (falling)
T (falling)
2.125
1.620
1.530
3.000
2.188
1.665
1.575
3.075
2.250
1.710
1.620
3.150
S (falling)
R (falling)
Z (falling)
Y (falling)
2.850
2.550
2.250
2.125
2.925
2.625
2.313
2.188
3.000
2.700
2.375
2.250
VCC2 Reset Threshold
VTH2
W (falling)
V (falling)
I (falling)
H (falling)
G (falling)
F (falling)
E (falling)
1.620
1.530
1.350
1.275
1.080
1.020
0.810
1.665
1.575
1.388
1.313
1.110
1.050
0.833
1.710
1.620
1.425
1.350
1.140
1.080
0.855
V
Reset Threshold Tempco
D (falling)
0.765 0.788 0.810
20 ppm/°C
Reset Threshold Hysteresis
VHYST Referenced to VTH typical
0.5 %
2 _______________________________________________________________________________________


Part Number MAX6726
Description Dual/Triple Ultra-Low-Voltage SOT23 P Supervisory Circuits
Maker Maxim
Total Page 19 Pages
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