MAX821 Maxim, MAX821 Datasheet
MAX821
Manufacturer Part Number
MAX821
Description
4-Pin P Voltage Monitors with Pin-Selectable Power-On Reset Timeout Delay
Manufacturer
Maxim
Datasheet
1.MAX821.pdf
(8 pages)
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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 1; 12/99
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
__________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 P and C 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
CC
P
CC
has
* The first two letters in the package top mark identify the part,
Note: These parts are offered in the SOT143-4 package, in the
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.
Pin-Selectable, Precision Power-On Reset Delay:
1ms (max), 20ms (min), or 100ms (min)
Precision Monitoring of +3V to +5V Power-Supply
Voltages
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
TOP VIEW
( ) ARE FOR MAX822
PART
extended temperature range (-40°C to +85°C).
(RESET) RESET
GND
NOMINAL V
2
1
Ordering Information
4.38
4.00
3.08
2.93
2.78
2.63
4.63
4.38
3.08
2.93
2.63
SOT143
4.63
MAX821
MAX822
Pin Configuration
TH
(V)
CC
3
4
= 1V (MAX821)
V
SRT
CC
TOP MARK*
Features
BM_ _
BG_ _
BA_ _
BB_ _
BC_ _
BD_ _
BH_ _
BK_ _
BL_ _
BF_ _
BJ_ _
AZ_ _
1
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