MAX821SUS-T Maxim Integrated Products, MAX821SUS-T Datasheet

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MAX821SUS-T

Manufacturer Part Number
MAX821SUS-T
Description
Microprocessor voltage monitor with pin-selectable power-on reset timeout delay (1ms,max, 20ms,min or 100ms,min). Reset threshold(nom) 2.93V. Active-low reset output.
Manufacturer
Maxim Integrated Products
Datasheet

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The MAX821/MAX822 microprocessor (µP) supervisory
circuits monitor power supplies in µP and digital sys-
tems. They provide excellent circuit reliability and low
cost by eliminating external components and adjust-
ments when used with 5V-powered or 3V-powered cir-
cuits. The MAX821/MAX822 also provide a power-on
reset timeout delay that is pin selectable to 1ms (max),
20ms (min), or 100ms (min).
These devices perform a single function: they assert a
reset signal whenever the V
below a preset threshold, and they keep reset asserted
for the pin-selected reset timeout delay after V
risen above the reset threshold. The only difference
between the two devices is that the MAX821 has an
active-low RESET output (which is guaranteed to be in
the correct state for V
MAX822 has an active-high RESET output. The reset
comparator is designed to ignore fast transients on
V
ety of supply voltages are available.
Low supply current makes the MAX821/MAX822 ideal
for use in portable equipment. These devices come in a
4-pin SOT143 package.
________________________Applications
19-1122; Rev 3; 12/05
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
CC
. Reset thresholds suitable for operation with a vari-
4-Pin µP Voltage Monitors with Pin-Selectable
100ms
Bar-Code Scanners
Computers
Controllers
Intelligent Instruments
Critical µP and µC Power Monitoring
Portable/Battery-Powered Equipment
20ms
1ms
SRT
________________________________________________________________ Maxim Integrated Products
MAX821
MAX822
GND
V
CC
(RESET)
General Description
RESET
CC
down to 1V), while the
CC
supply voltage falls
( ) ARE FOR MAX822
RESET
INPUT
GND
Power-On Reset Timeout Delay
V
µP
CC
CC
has
♦ Pin-Selectable, Precision Power-On Reset Delay:
♦ Precision Monitoring of +3V to +5V Power-Supply
♦ 2.5µA Supply Current
♦ Guaranteed Over Temperature (-40°C to +125°C)
♦ Guaranteed RESET Valid to V
♦ Power-Supply Transient Immunity
♦ No External Components
♦ SOT143 Package
* The first two letters in the package top mark identify the part,
Devices are available in both leaded and lead-free packaging.
Specify lead-free by replacing “-T” with “+T” when ordering.
MAX821LUS-T
MAX821MUS-T
MAX821PUS-T
MAX821TUS-T
MAX821SUS-T
MAX821UUS-T
MAX821RUS-T
MAX822LUS-T
MAX822MUS-T
MAX822TUS-T
MAX822SUS-T
MAX822RUS-T
while the remaining two letters are the lot-tracking code.
1ms (max), 20ms (min), or 100ms (min)
Voltages
TOP VIEW
( ) ARE FOR MAX822
PART
(RESET) RESET
GND
NOMINAL V
2
1
Ordering Information
SOT143
4.63
4.38
4.00
3.08
2.93
2.78
2.63
4.63
4.38
3.08
2.93
2.63
MAX821
MAX822
Pin Configuration
TH
(V)
CC
3
4
= 1V (MAX821)
V
SRT
CC
TOP MARK*
Features
BM_ _
BC_ _
BD_ _
BG_ _
BH_ _
BA_ _
BB_ _
BL_ _
BF_ _
BK_ _
BJ_ _
AZ_ _
1

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MAX821SUS-T Summary of contents

Page 1

... Power-Supply Transient Immunity ♦ No External Components has CC ♦ SOT143 Package PART MAX821LUS-T MAX821MUS-T MAX821PUS-T MAX821TUS-T MAX821SUS-T MAX821UUS-T MAX821RUS-T MAX822LUS-T MAX822MUS-T MAX822TUS-T MAX822SUS-T MAX822RUS-T * The first two letters in the package top mark identify the part, while the remaining two letters are the lot-tracking code. ...

Page 2

Voltage Monitors with Pin-Selectable Power-On Reset Timeout Delay ABSOLUTE MAXIMUM RATINGS Terminal Voltage (with respect to GND) V ......................................................................-0.3V to 6.0V CC All Other Inputs.......................................-0. Input Current SRT......................................................20mA CC Output Current, RESET or RESET ...

Page 3

Voltage Monitors with Pin-Selectable ELECTRICAL CHARACTERISTICS (continued full range -40°C to +125°C, unless otherwise noted. Typical values are PARAMETER SYMBOL SRT Input Capacitance (Note 3) (see Setting the Reset Timeout ...

Page 4

Voltage Monitors with Pin-Selectable Power-On Reset Timeout Delay ____________________________Typical Operating Characteristics (continued +25°C, unless otherwise noted.) A MAX82_R/S/T POWER-DOWN RESET DELAY vs. TEMPERATURE FALLING AT 1mV/µ ...

Page 5

Voltage Monitors with Pin-Selectable _______________Detailed Description A microprocessor’s (µP’s) reset input starts the µ known state. These µP supervisory circuits assert reset to prevent code-execution errors during power-up, power-down, or brownout conditions. They also provide a ...

Page 6

Voltage Monitors with Pin-Selectable Power-On Reset Timeout Delay Ensuring a Valid Down to V falls below 1V, the MAX821 RESET output When longer sinks current—it becomes an open circuit. Therefore, high-impedance CMOS logic inputs con- ...

Page 7

... 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. 7 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2005 Maxim Integrated Products Power-On Reset Timeout Delay Printed USA is a registered trademark of Maxim Integrated Products, Inc ...

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