MAX6828 MAXIM [Maxim Integrated Products], MAX6828 Datasheet

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MAX6828

Manufacturer Part Number
MAX6828
Description
Dual Ultra-Low-Voltage SOT23 ?P Supervisors with Manual Reset and Watchdog Timer
Manufacturer
MAXIM [Maxim Integrated Products]
Datasheet
The MAX6826–MAX6831 are ultra-low-voltage micro-
processor (µP) supervisory circuits designed to monitor
two power supplies and have manual reset and watch-
dog input functions. These devices assert a system reset
if any of the monitored supplies fall below the prepro-
grammed thresholds, and maintain reset for a minimum
timeout period after the supplies rise above the threshold.
Microprocessor supervisors significantly improve system
reliability and accuracy compared to separate ICs or dis-
crete components. These devices monitor primary volt-
ages from +1.8V to +5.0V and secondary voltages from
+0.9V to +2.5V. These devices are guaranteed to be in
the correct state for V
A variety of preprogrammed reset threshold voltages
are available (see Threshold Suffix Guide). The devices
include manual reset and watchdog inputs. The
MAX6829/MAX6830/MAX6831 provide a factory-
trimmed threshold to monitor a 2nd voltage down to
+0.9V. The MAX6826/MAX6829 have a push-pull
RESET, the MAX6827/MAX6830 have a push-pull
RESET and the MAX6828/MAX6831 have an open-drain
RESET. The MAX6826/MAX6827/MAX6828 have an aux-
iliary monitor that allows user adjustable input to monitor
voltages down to +0.6V. See Selector Guide for func-
tions available.
19-1867; Rev 1; 1/02
________________________Applications
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.
Typical Operating Circuit appears at end of data sheet.
Threshold Suffix Guide appears at end of data sheet.
Portable/Battery-
Powered Equipment
Embedded Controllers
Intelligent Instruments
Dual Ultra-Low-Voltage SOT23 µP Supervisors
TOP VIEW
(RESET) MAX6827/MAX6830 ONLY
RESET IN FOR MAX6826/MAX6827/MAX6828 ONLY
V
CC2
FOR MAX6829/MAX6830/MAX6831 ONLY
RESET(RESET)
GND
________________________________________________________________ Maxim Integrated Products
MR
with Manual Reset and Watchdog Timer
CC
1
2
3
General Description
down to +1.0V.
MAX6826–
SOT23-6
MAX6831
Pin Configuration
Automotive Systems
Critical µP Monitoring
Multivoltage Systems
6
5
4
V
RESET IN/V
WDI
CC
CC2
o Monitor Primary V
o User Adjustable RESET IN Down to +0.63V
o 140ms (min) Reset Timeout Delay
o 1.6s Watchdog Timeout Period
o Manual Reset Input
o Three Reset Output Options
o Guaranteed Reset Valid Down to V
o Immune to Short Negative V
o No External Components
o Small 6-pin SOT23 Packages
the blanks to complete the part number.
*Samples are typically available for standard versions only.
The MAX6826/MAX6827/MAX6828 require a 2.5k minimum
order increment for all versions. Contact factory for availability.
Standard Versions Table continued at end of data sheet.
Selector Guide appears at end of data sheet.
MAX6826_UT-T
MAX6827_UT-T
MAX6828_UT-T
MAX6829_ _UT-T
MAX6830_ _UT-T
M AX6831_ _UT-T
Insert the desired suffix letter (from Standard Versions table) into
(MAX6826/MAX6827/MAX6828)
to +5.0V and Secondary V
from +0.9V to +2.5V
Push-Pull RESET
Push-Pull RESET
Open-Drain RESET
PART
MAX6826/MAX6827/MAX6828
Standard Versions Table*
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
CC
Ordering Information
TEMP RANGE
Supplies from +1.8V
S
R
Z
V
L
CC
CC2
Transients
Supplies
CC
PIN-PACKAGE
6 SOT23-6
6 SOT23-6
6 SOT23-6
6 SOT23-6
6 SOT23-6
6 SOT23-6
Features
= +1.0V
1

Related parts for MAX6828

MAX6828 Summary of contents

Page 1

... The MAX6826/MAX6829 have a push-pull RESET, the MAX6827/MAX6830 have a push-pull RESET and the MAX6828/MAX6831 have an open-drain RESET. The MAX6826/MAX6827/MAX6828 have an aux- iliary monitor that allows user adjustable input to monitor voltages down to +0.6V. See Selector Guide for func- tions available ...

Page 2

Dual Ultra-Low-Voltage SOT23 µP Supervisors with Manual Reset and Watchdog Timer ABSOLUTE MAXIMUM RATINGS GND.................................................-0.3V to +6.0V CC CC2 Open-Drain RESET................................................-0.3V to +6.0V Push-Pull RESET, RESET............................-0. MR, WDI, RESET IN....................................-0. Input Current ...

Page 3

Dual Ultra-Low-Voltage SOT23 µP Supervisors with Manual Reset and Watchdog Timer ELECTRICAL CHARACTERISTICS (continued +4.5V to +5.5V for MAX68_ _L/ +1.53V to +2.0V for MAX68_ _W/ PARAMETER SYMBOL V Reset Threshold CC2 ...

Page 4

Dual Ultra-Low-Voltage SOT23 µP Supervisors with Manual Reset and Watchdog Timer ELECTRICAL CHARACTERISTICS (continued +4.5V to +5.5V for MAX68_ _L/ +1.53V to +2.0V for MAX68_ _W/ PARAMETER SYMBOL RESET Output HIGH V ...

Page 5

Dual Ultra-Low-Voltage SOT23 µP Supervisors with Manual Reset and Watchdog Timer (T = +25°C, unless otherwise noted.) A SUPPLY CURRENT vs. TEMPERATURE +5V, L VERSION +3.3V, S VERSION CC ...

Page 6

Dual Ultra-Low-Voltage SOT23 µP Supervisors with Manual Reset and Watchdog Timer (T = +25°C, unless otherwise noted.) A VOLTAGE OUTPUT LOW vs. I 0.350 V = +2.9V CC 0.300 0.250 0.200 0.150 0.010 0.005 ...

Page 7

... Factory-Trimmed V Monitor. Connect this pin to a secondary power- CC2 5 V CC2 supply voltage Supply Voltage. Input for primary reset threshold monitor. CC MAX6826/MAX6827/MAX6828 RESET TIMEOUT DELAY GENERATOR 1.26V 0.63V V CC WATCHDOG WATCHDOG TRANSITION DETECTOR Pin Description (continued) ...

Page 8

Dual Ultra-Low-Voltage SOT23 µP Supervisors with Manual Reset and Watchdog Timer CC2 MR WDI Figure 2. Functional Diagram of V CC2 Detailed Description RESET /RESET Output A microprocessor’s (µP’s) reset input starts the µ known ...

Page 9

... If WDI is externally driven high for the majority of the timeout period 160µA can flow into WDI. Since the RESET output on the MAX6828/MAX6831 is open drain, these devices interface easily with µPs that have bidirectional reset pins, such as the Motorola 68HC11. Connecting the µ ...

Page 10

... This scheme does not work with the open-drain outputs of the MAX6828/MAX6831. The resistor value used is not criti- cal, but it must be small enough not to load the reset output when V is above the reset threshold ...

Page 11

... Manual Reset and Watchdog Timer V THRESHOLD RESET THRESHOLD ( ACTIVE-LOW ACTIVE-HIGH FUNCTION RESET RESET ✔ MAX6826 MAX6827 — MAX6828 — ✔ MAX6829 MAX6830 — MAX6831 — Standard Versions Table* (continued) MAX6829/MAX6830/MAX6831 V CC 3.3V 2.5V 1.8V TZ — — — SH ...

Page 12

Dual Ultra-Low-Voltage SOT23 µP Supervisors with Manual Reset and Watchdog Timer 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 ...

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