MAX824TEUK Maxim Integrated Products, MAX824TEUK Datasheet

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MAX824TEUK

Manufacturer Part Number
MAX824TEUK
Description
Manufacturer
Maxim Integrated Products
Datasheet

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________________General Description
The MAX823/MAX824/MAX825* microprocessor (µP)
supervisory circuits combine reset output, watchdog,
and manual reset input functions in 5-pin SOT23 and
SC70 packages. They significantly improve system relia-
bility and accuracy compared to separate ICs or discrete
components. The MAX823/MAX824/MAX825 are specifi-
cally designed to ignore fast transients on V
Seven preprogrammed reset threshold voltages are
available (see Reset Threshold Table). All three devices
have an active-low reset output, which is guaranteed to
be in the correct state for V
also offers a watchdog input and manual reset input.
The MAX824 offers a watchdog input and a comple-
mentary active-high reset. The MAX825 offers a manual
reset input and a complementary active-high reset. The
Selector Guide explains the functions offered in this
series of parts.
________________________Applications
19-0487; Rev 5; 12/05
*Patents Pending
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.
TOP VIEW
5-Pin Microprocessor Supervisory Circuits With
Computers and Controllers
Embedded Controllers
Intelligent Instruments
Automotive Systems
Critical µP Monitoring
Portable/Battery-Powered Equipment
Z (SC70 only)
Y (SC70 only)
SUFFIX
RESET
GND
M
L
T
S
R
MR
1
2
3
________________________________________________________________ Maxim Integrated Products
SOT23/SC70
Reset Threshold Table
MAX823
CC
down to 1V. The MAX823
5
4
Watchdog Timer and Manual Reset
V
WDI
CC
THRESHOLD (V)
RESET
4.63
4.38
3.08
2.93
2.63
2.32
2.19
CC
.
RESET
RESET
GND
1
2
3
SOT23/SC70
MAX824
†Insert the desired suffix letter (from the Reset Threshold table) into
the blank to complete the part number. All devices are available in
tape-and-reel only. There is a 2500 piece minimum order increment.
Devices are available in both leaded and lead-free packaging.
Specify lead-free by replacing “-T” with “+T” when ordering.
Ordering Information continued at end of data sheet.
♦ Precision Monitoring of +2.5V, +3V, +3.3V, and
♦ Operating Current: 6µA (MAX823L/M) (SC70)
♦ Fully Specified Over Temperature
♦ 140ms min Power-On Reset
♦ Guaranteed RESET Valid to V
♦ Power-Supply Transient Immunity
♦ Watchdog Timer with 1.6s Timeout
♦ Manual Reset Input (MAX823/MAX825)
♦ No External Components
______________________Selector Guide
Typical Operating Circuit appears at end of data sheet.
Marking Information appears at end of data sheet.
MAX823_EXK-T
MAX823_EUK-T
MAX824_EXK-T
Active-Low Reset
Active-High Reset
Watchdog Input
Manual Reset Input
+5V Power Supplies
(MAX823/MAX824)
4
5
PART †
FUNCTION
V
WDI
CC
-40°C to +85°C
-40°C to +125°C
-40°C to +85°C
RESET
RESET
TEMP. RANGE
GND
Ordering Information
2µA (MAX825T/S/R/Z/Y) (SC70)
MAX823
1
2
3
Pin Configurations
SOT23/SC70
MAX825
CC
MAX824
= 1V
PIN-PACKAGE
5 SC70-5
5 SOT23-5
5 SC70-5
5
4
Features
V
MR
CC
MAX825
1

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MAX824TEUK Summary of contents

Page 1

... WDI MR 4 SOT23/SC70 ________________________________________________________________ Maxim Integrated Products 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. ♦ Precision Monitoring of +2.5V, +3V, +3.3V, and +5V Power Supplies ♦ Operating Current: 6µA (MAX823L/M) (SC70) ♦ Fully Specified Over Temperature ♦ ...

Page 2

Microprocessor Supervisory Circuits With Watchdog Timer and Manual Reset ABSOLUTE MAXIMUM RATINGS V ........................................................................-0.3V to +6.0V CC All Other Pins..............................................-0. Input Current, All Pins Except RESET and RESET..............20mA Output Current, RESET, RESET ..........................................20mA Continuous Power Dissipation (T ...

Page 3

Microprocessor Supervisory Circuits With Watchdog Timer and Manual Reset ELECTRICAL CHARACTERISTICS (continued +4.75V to +5.5V for MAX82_L +3.6V for MAX82_S +2.7V to +3.6V for MAX82_R MAX82_Y ...

Page 4

Microprocessor Supervisory Circuits With Watchdog Timer and Manual Reset ELECTRICAL CHARACTERISTICS (continued +4.75V to +5.5V for MAX82_L +3.6V for MAX82_S +2.7V to +3.6V for MAX82_R MAX82_Y ...

Page 5

Microprocessor Supervisory Circuits With Watchdog Timer and Manual Reset __________________________________________Typical Operating Characteristics MAX823_ +5V +25°C, unless otherwise noted SUPPLY CURRENT CC vs. TEMPERATURE 9 (SC70 ONLY) 8 MAX823L MAX824Y ...

Page 6

Microprocessor Supervisory Circuits With Watchdog Timer and Manual Reset PIN MAX823 MAX824 MAX825 — 4 — — (MAX823/MAX825 ONLY) WDI ...

Page 7

Microprocessor Supervisory Circuits With Watchdog Timer and Manual Reset _______________Detailed Description A microprocessor’s (µP’s) reset input starts the µ known state. The MAX823/MAX824/MAX825 µP super- visory circuits assert a reset to prevent code-execution errors during power-up, power-down, ...

Page 8

Microprocessor Supervisory Circuits With Watchdog Timer and Manual Reset Interfacing to µPs with Bidirectional Reset Pins The RESET output maximum pullup current is 800µA for L/M versions (400µA for T/S/R/Z/Y versions). This allows µPs with bidirectional resets, such as ...

Page 9

Microprocessor Supervisory Circuits With Watchdog Timer and Manual Reset Typical Operating Circuit RESET MAX823 WDI MR MANUAL RESET GND Ordering Information (continued) PART † TEMP. RANGE MAX824_EUK-T -40°C to +125°C MAX825_EXK-T -40°C to +85°C MAX825_EUK-T ...

Page 10

... 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. 10 __________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 (408) 737-7600 © 2005 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products, Inc ...

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