MAX6747KA31+T Maxim Integrated Products, MAX6747KA31+T Datasheet

IC RESET MPU W/ADJ RESET SOT23-8

MAX6747KA31+T

Manufacturer Part Number
MAX6747KA31+T
Description
IC RESET MPU W/ADJ RESET SOT23-8
Manufacturer
Maxim Integrated Products
Type
Simple Reset/Power-On Resetr
Datasheet

Specifications of MAX6747KA31+T

Number Of Voltages Monitored
1
Output
Open Drain or Open Collector
Reset
Active Low
Reset Timeout
Adjustable/Selectable
Voltage - Threshold
3.075V
Operating Temperature
-40°C ~ 125°C
Mounting Type
Surface Mount
Package / Case
SOT-23-8
Monitored Voltage
1.575 V to 5 V
Output Type
Active Low, Open Drain
Manual Reset
Resettable
Watchdog
Watchdog
Battery Backup Switching
No Backup
Supply Voltage (max)
5.5 V
Supply Voltage (min)
1 V
Supply Current (typ)
5 uA
Maximum Power Dissipation
714 mW
Maximum Operating Temperature
+ 125 C
Mounting Style
SMD/SMT
Minimum Operating Temperature
- 40 C
Power Fail Detection
No
Undervoltage Threshold
3.014 V
Overvoltage Threshold
3.137 V
Power-up Reset Delay (typ)
9.487 ms
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
MAX6747KA31+T
MAX6747KA31+TTR
The MAX6746–MAX6753 low-power microprocessor
(µP) supervisory circuits monitor single/dual system
supply voltages from 1.575V to 5V and provide maxi-
mum adjustability for reset and watchdog functions.
These devices assert a reset signal whenever the V
supply voltage or RESET IN falls below its reset thresh-
old or when manual reset is pulled low. The reset output
remains asserted for the reset timeout period after V
and RESET IN rise above the reset threshold. The reset
function features immunity to power-supply transients.
The MAX6746–MAX6753 have ±2% factory-trimmed
reset threshold voltages in approximately 100mV incre-
ments from 1.575V to 5.0V and/or adjustable reset
threshold voltages using external resistors.
The reset and watchdog delays are adjustable with
external capacitors. The MAX6746–MAX6751 contain a
watchdog select input that extends the watchdog time-
out period by 128x. The MAX6752/MAX6753 contain a
window watchdog timer that looks for activity outside an
expected window of operation.
The MAX6746–MAX6753 are available with a push-pull
or open-drain active-low RESET output. The MAX6746–
MAX6753 are available in an 8-pin SOT23 package and
are fully specified over the automotive temperature
range (-40°C to +125°C).
19-2530; Rev 5; 12/10
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.
Pin Configurations continued at end of data sheet.
Medical Equipment
Automotive
Intelligent Instruments
Portable Equipment
Battery-Powered
Computers/Controllers
TOP VIEW
( ) ARE FOR MAX6746 AND MAX6747 ONLY.
RESET IN (MR)
µP Reset Circuits with Capacitor-Adjustable
SWT
GND
SRT
________________________________________________________________ Maxim Integrated Products
1
2
4
3
General Description
MAX6746–
MAX6751
SOT23-8
Pin Configurations
Embedded Controllers
Critical µP Monitoring
Set-Top Boxes
Computers
6
8
7
5
Applications
V
RESET
WDI
WDS
CC
Reset/Watchdog Timeout Delay
CC
CC
♦ Factory-Set Reset Threshold Options from 1.575V
♦ Adjustable Reset Threshold Options
♦ Single/Dual Voltage Monitoring
♦ Capacitor-Adjustable Reset Timeout
♦ Capacitor-Adjustable Watchdog Timeout
♦ Min/Max (Windowed) Watchdog Option
♦ Manual Reset Input Option
♦ Guaranteed RESET Valid for V
♦ 3.7µA Supply Current
♦ Push-Pull or Open-Drain RESET Output Options
♦ Power-Supply Transient Immunity
♦ Small 8-Pin SOT23 Packages
Selector Guide appears at end of data sheet.
Typical Operating Circuit appears at end of data sheet.
Note: “_ _” represents the two number suffix needed when
ordering the reset threshold voltage value for the
MAX6746/MAX6747 and MAX6750–MAX6753. The reset
threshold voltages are available in approximately 100mV incre-
ments. Table 2 contains the suffix and reset factory-trimmed
voltages. All devices are available in tape-and-reel only. There
is a 2500-piece minimum order increment for standard ver-
sions (see Table 3). Sample stock is typically held on standard
versions only. Nonstandard versions require a minimum order
increment of 10,000 pieces. Contact factory for availability.
Devices are available in both leaded and lead-free packaging.
Specify lead-free by replacing “-T” with “+T” when ordering.
/V Denotes an automotive qualified part.
MAX6746KA_ _-T
MAX6746KA_ _/V+T
MAX6747KA_ _-T
MAX6748KA-T
MAX6749KA-T
MAX6750KA_ _-T
MAX6750KA_ _/V+T
MAX6751KA_ _-T
MAX6752KA_ _-T
MAX6753KA_ _-T
MAX6753KA_ _/V+T
to 5V in ~100mV Increments
PART
-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
-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
Ordering Information
TEMP RANGE
CC
≥ 1V
PIN-PACKAGE
8 SOT23
8 SOT23
8 SOT23
8 SOT23
8 SOT23
8 SOT23
8 SOT23
8 SOT23
8 SOT23
8 SOT23
8 SOT23
Features
1

Related parts for MAX6747KA31+T

MAX6747KA31+T Summary of contents

Page 1

... SOT23 ARE FOR MAX6746 AND MAX6747 ONLY. Pin Configurations continued at end of data sheet. ________________________________________________________________ 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. Reset/Watchdog Timeout Delay ♦ Factory-Set Reset Threshold Options from 1.575V ~100mV Increments ♦ ...

Page 2

Reset Circuits with Capacitor-Adjustable Reset/Watchdog Timeout Delay ABSOLUTE MAXIMUM RATINGS V to GND ...........................................................-0.3V to +6.0V CC SRT, SWT, SET0, SET1, RESET IN, WDS, MR, WDI, to GND .......................................…-0. RESET (Push-Pull) to GND......................…-0. RESET (Open ...

Page 3

Reset Circuits with Capacitor-Adjustable ELECTRICAL CHARACTERISTICS (continued +1.2V to +5.5V MIN MAX PARAMETER SYMBOL Fast Watchdog Timeout Period, SET Ratio = 64, (MAX6752/MAX6753) Fast Watchdog Minimum Period (MAX6752/MAX6753) SWT Ramp ...

Page 4

Reset Circuits with Capacitor-Adjustable Reset/Watchdog Timeout Delay (V = +5V +25°C, unless otherwise noted RESET TIMEOUT PERIOD vs. C SRT 1000 100 10 1 0.1 100 1000 10,000 100,000 C (pF) SRT NORMALIZED RESET TIMEOUT ...

Page 5

Reset Circuits with Capacitor-Adjustable (V = +5V +25°C, unless otherwise noted RESET DELAY CC vs. TEMPERATURE (V FALLING) CC 27.0 V FALLING AT 1mV/μs CC 26.6 26.2 25.8 25.4 25.0 -50 -25 0 ...

Page 6

Reset Circuits with Capacitor-Adjustable Reset/Watchdog Timeout Delay PIN MAX6746 MAX6748– MAX6752 MAX6747 MAX6751 MAX6753 5 5 — — — _______________________________________________________________________________________ Pin Description (continued) NAME Watchdog Select Input. WDS ...

Page 7

Reset Circuits with Capacitor-Adjustable GUARANTEED TO ASSERT RESET WDI CONDITION 1 WDI CONDITION 2 WDI CONDITION 3 *UNDETERMINED STATES MAY OR MAY NOT GENERATE A FAULT CONDITION Figure 1. MAX6752/MAX6753 Detailed Watchdog Input Timing Relationship Detailed Description The MAX6746–MAX6753 ...

Page 8

Reset Circuits with Capacitor-Adjustable Reset/Watchdog Timeout Delay V MON_TH R1 RESET IN MAX6748 R2 MAX6749 MAX6750 GND MAX6751 Figure 3. Adding an External Manual Reset Function to the MAX6748–MAX6751 where V is the desired reset threshold voltage MON_TH and ...

Page 9

Reset Circuits with Capacitor-Adjustable V CC WDI RESET OV EXTENDED MODE (WDS = Figure 4b. Watchdog Timing Diagram, WDS = V MAX6746–MAX6751 The watchdog’s circuit monitors the µP’s activity. It the µP does ...

Page 10

Reset Circuits with Capacitor-Adjustable Reset/Watchdog Timeout Delay t < t (MIN) WDI WD1 WDI RESET (a) FAST FAULT t > t (MAX) WDI WD2 WDI RESET (b) SLOW FAULT t (MAX) < t < t (MIN) WD1 WDI WD2 ...

Page 11

Reset Circuits with Capacitor-Adjustable Interfacing to Other Voltages for Logic Compatibility The open-drain RESET output can be used to interface to a µP with other logic levels. As shown in Figure 6, the open-drain output can be connected to ...

Page 12

Reset Circuits with Capacitor-Adjustable Reset/Watchdog Timeout Delay Table 2. Reset Threshold Voltage Suffix (T = -40°C to +125°C) A SUFFIX MIN TYP 50 4.900 5.000 49 4.802 4.900 48 4.704 4.800 47 4.606 4.700 46 4.533 4.625 45 4.410 ...

Page 13

Reset Circuits with Capacitor-Adjustable FIXED V ADJUSTABLE CC PART RESET RESET THRESHOLD THRESHOLD MAX6746 X — MAX6747 X — MAX6748 — X MAX6749 — X MAX6750 X X MAX6751 X X MAX6752 X — MAX6753 X — Typical Operating ...

Page 14

... 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. 14 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2010 Maxim Integrated Products DESCRIPTION Maxim is a registered trademark of Maxim Integrated Products, Inc ...

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