19-2325; Rev 2; 10/02
Dual/Triple Ultra-Low-Voltage SOT23 µP
Supervisory Circuits
General Description
Features
o V 1 (primary supply) Reset Threshold Voltages
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.
CC
from 1.58V to 4.63V
o V 2 (secondary supply) Reset Threshold
CC
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
These devices monitor primary supply voltages (V 1) from
CC
35s (min) Long Startup Period
1.12s (min) Normal Timeout Period
1.8V to 5.0V and secondary supply voltages (V 2) from
CC
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
o Manual Reset Input Option
o Power-Fail Input/Power-Fail Output Option
(Push-Pull and Open-Drain Active-Low)
when either V 1 or V 2 remains greater than 0.8V.
CC
CC
o Guaranteed Reset Valid Down to V 1 or
CC
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.
V
2 = 0.8V
CC
o Reset Output Logic Options
o Immune to Short V Transients
CC
o Low Supply Current 14µA (typ) at 3.6V
o Small 5, 6, and 8-Pin SOT23 Packages
Ordering Information
Applications
Multivoltage Systems
PART
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
6 SOT23-6
6 SOT23-6
5 SOT23-5
5 SOT23-5
6 SOT23-6
6 SOT23-6
Telecom/Networking Equipment
Computers/Servers
MAX6715UT_ _D_ -T
MAX6716UT_ _D_ -T
MAX6717UK_ _D_ -T
MAX6718UK_ _D_ -T
MAX6719UT_ _D_ -T
MAX6720UT_ _D_ -T
Portable/Battery-Operated Equipment
Industrial Equipment
Printer/Fax
Set-Top Boxes
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
Typical Operating Circuit
OUT2
DC/DC
UNREGULATED
IN
CONVERTER
DC
MAX6716UTLTD3-T is a dual-voltage supervisor V 1 = 4.625V,
OUT1
1.8V
I/O
0.9V
CORE
TH
V 2 = 3.075V, and 210ms (typ) timeout period.
TH
V
1
CC
V
2
CC
SUPPLY SUPPLY
R1
R2
RESET
RST
WDI
PFO
Ordering Information continued at end of data sheet.
Pin Configurations appear at end of data sheet.
Selector Guide appears at end of data sheet.
µP
RSTIN/PFI
MR
I/O
NMI
MAX67_ _
PUSHBUTTON
SWITCH
________________________________________________________________ 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.
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