MAX823ZEXK+T Maxim Integrated Products, MAX823ZEXK+T Datasheet

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MAX823ZEXK+T

Manufacturer Part Number
MAX823ZEXK+T
Description
Supervisory Circuits 5-Pin MPU Supervisor
Manufacturer
Maxim Integrated Products
Datasheet

Specifications of MAX823ZEXK+T

Number Of Voltages Monitored
1
Monitored Voltage
2.5 V, 3 V, 3.3 V, 5 V
Output Type
Active Low, Push-Pull
Manual Reset
Resettable
Watchdog
Watchdog
Battery Backup Switching
No Backup
Supply Voltage (min)
1.2 V
Supply Current (typ)
4 uA
Maximum Power Dissipation
247 mW
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
Package / Case
SC-70
Minimum Operating Temperature
- 40 C
Power Fail Detection
No
Undervoltage Threshold
2.28 V
Overvoltage Threshold
2.35 V
Power-up Reset Delay (typ)
280 ms
Supply Voltage (max)
5.5 V
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
________________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
*Pg
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

Related parts for MAX823ZEXK+T

MAX823ZEXK+T 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 = +70°C) A 5-Pin SC70 (derate 3.1mW/°C above +70°C) ...............247mW Stresses beyond those listed under “ ...

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 -40°C to +85°C (SC70 MIN MAX A are +25°C.) (Note 1) A PARAMETER SYMBOL Reset Threshold Hysteresis Reset Threshold Temperature ...

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 -40°C to +85°C (SC70 MIN MAX A are +25°C.) (Note 1) A PARAMETER SYMBOL MANUAL RESET INPUT (MAX823/MAX825) ...

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 4 3 MAX825R 2 1 -40 - 100 120 TEMPERATURE (°C) WATCHDOG TIMEOUT PERIOD vs. TEMPERATURE 2.0 1.9 1.8 1 ...

Page 6

... Microprocessor Supervisory Circuits With Watchdog Timer and Manual Reset PIN MAX823 MAX824 MAX825 — 4 — — (MAX823/MAX825 ONLY) WDI (MAX823/MAX824 ONLY) Figure 1. Functional Diagram 6 _______________________________________________________________________________________ NAME Active-Low Reset Output. Pulses low for 200ms when triggered, and remains is below the reset threshold or when logic low. It ...

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, and brownout conditions. RESET is guaranteed logic low for V down to 1V ...

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 the 68HC11, to force RESET low when the MAX823/MAX824/MAX825 are pulling RESET high (Figure 4) ...

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 -40°C to +125°C †Insert the desired suffix letter (from the Reset Threshold table) into the blank to complete the part number ...

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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