MAX8211ETY 반도체 회로 부품 판매점
Microprocessor Voltage Monitors with Programmable Voltage Detection
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 Maxim Integrated |
19-1122; Rev 1; 12/99
4-Pin µP Voltage Monitors with Pin-Selectable
Power-On Reset Timeout Delay
General Description
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 VCC supply voltage falls
below a preset threshold, and they keep reset asserted
for the pin-selected reset timeout delay after VCC has
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 VCC down to 1V), while the
MAX822 has an active-high RESET output. The reset
comparator is designed to ignore fast transients on
VCC. Reset thresholds suitable for operation with a vari-
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
Bar-Code Scanners
Computers
Controllers
Intelligent Instruments
Critical µP and µC Power Monitoring
Portable/Battery-Powered Equipment
__________Typical Operating Circuit
Features
o Pin-Selectable, Precision Power-On Reset Delay:
1ms (max), 20ms (min), or 100ms (min)
o Precision Monitoring of +3V to +5V Power-Supply
Voltages
o 2.5µA Supply Current
o Guaranteed Over Temperature (-40°C to +125°C)
o Guaranteed RESET Valid to VCC = 1V (MAX821)
o Power-Supply Transient Immunity
o No External Components
o SOT143 Package
Ordering Information
PART
NOMINAL VTH (V)
TOP MARK*
MAX821LUS-T
4.63
AZ_ _
MAX821MUS-T
4.38
BA_ _
MAX821PUS-T
4.00
BM_ _
MAX821TUS-T
3.08
BB_ _
MAX821SUS-T
2.93
BC_ _
MAX821UUS-T
2.78
BL_ _
MAX821RUS-T
2.63
BD_ _
MAX822LUS-T
4.63
BF_ _
MAX822MUS-T
4.38
BG_ _
MAX822TUS-T
3.08
BH_ _
MAX822SUS-T
2.93
BJ_ _
MAX822RUS-T
2.63
BK_ _
* The first two letters in the package top mark identify the part,
while the remaining two letters are the lot-tracking code.
Note: These parts are offered in the SOT143-4 package, in the
extended temperature range (-40°C to +85°C).
20ms
100ms
1ms
VCC
MAX821
MAX822
RESET
SRT (RESET)
GND
VCC
µP
RESET
INPUT
GND
( ) ARE FOR MAX822
Pin Configuration
TOP VIEW
GND 1
MAX821
MAX822
4 VCC
(RESET) RESET 2
3 SRT
( ) ARE FOR MAX822
SOT143
________________________________________________________________ Maxim Integrated Products 1
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.
4-Pin µP Voltage Monitors with Pin-Selectable
Power-On Reset Timeout Delay
ABSOLUTE MAXIMUM RATINGS
Terminal Voltage (with respect to GND)
VCC ......................................................................-0.3V to 6.0V
All Other Inputs.......................................-0.3V to (VCC + 0.3V)
Input Current, VCC, SRT......................................................20mA
Output Current, RESET or RESET .......................................20mA
Continuous Power Dissipation (TA = +70°C)
SOT143-4 (derate 4mW/°C above +70°C)...................320mW
Operating Temperature Range .........................-40°C to +125°C
Storage Temperature Range .............................-65°C to +160°C
Lead Temperature (soldering, 10sec) .............................+300°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(VCC = full range, TA = -40°C to +125°C, unless otherwise noted. Typical values are at TA = +25°C.)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
VCC Range
Supply Current
Reset Threshold (Note 1)
Reset Threshold Tempco
TA = 0°C to +70°C
TA = -40°C to +85°C
MAX82_L/M/P,
TA = +25°C
ICC
VCC = 5.5V, IOUT = 0
MAX82_R/S/T/U,
TA = TMIN to TMAX
TA = +25°C
VCC = 5.5V, IOUT = 0 TA = TMIN to TMAX
MAX82_L
TA = +25°C
TA = -40°C to +125°C
MAX82_M
TA = +25°C
TA = -40°C to +125°C
MAX82_P
TA = +25°C
TA = -40°C to +125°C
VTH MAX82_T
TA = +25°C
TA = -40°C to +125°C
MAX82_S
TA = +25°C
TA = -40°C to +125°C
MAX82_U
TA = +25°C
TA = -40°C to +125°C
MAX82_R
TA = +25°C
TA = -40°C to +125°C
1.0 5.5
V
1.2 5.5
2.5 7.0
12
1.8 5.5
µA
9
4.56 4.63 4.70
4.50 4.75
4.31 4.38 4.45
4.25 4.50
3.97 4.00 4.04
3.91 4.09
3.04 3.08 3.11
3.00 3.15
V
2.89 2.93 2.96
2.85 3.00
2.74 2.78 2.81
2.70 2.85
2.59 2.63 2.66
2.55 2.70
30 ppm/°C
VCC to Reset Delay (Note 1)
VCC falling at 1mV/µs
SRT = GND
50
0.5 0.8
1
µs
Reset Active Timeout Period tRP SRT = VCC
SRT = unconnected
20 32 40
100 160 200
ms
SRT Input Current (Note 2)
SRT = GND
RESET = low for MAX821,
RESET = high for MAX822
SRT = VCC
SRT = unconnected
-100
-1
100 µA
1
SRT Input Threshold
VIL
VIH
VOPEN
RESET = low for MAX821,
RESET = high for MAX822
0.9VCC
0.07VCC
0.5VCC
V
2 _______________________________________________________________________________________
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MAX8211ETY
Microprocessor Voltage Monitors with Programmable Voltage Detection - Maxim Integrated
MAX8211ETY
Microprocessor Voltage Monitors with Programmable Voltage Detection - Maxim Integrated