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MAX825SEUK+T

P1-P3P4-P6P7-P9P10-P10
________________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
CC
.
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
CC
down to 1V. The MAX823
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
Computers and Controllers
Embedded Controllers
Intelligent Instruments
Automotive Systems
Critical µP Monitoring
Portable/Battery-Powered Equipment
Features
♦ Precision Monitoring of +2.5V, +3V, +3.3V, and
+5V Power Supplies
♦ Operating Current: 6µA (MAX823L/M) (SC70)
2µA (MAX825T/S/R/Z/Y) (SC70)
♦ Fully Specified Over Temperature
♦ 140ms min Power-On Reset
♦ Guaranteed RESET Valid to V
CC
= 1V
♦ Power-Supply Transient Immunity
♦ Watchdog Timer with 1.6s Timeout
(MAX823/MAX824)
♦ Manual Reset Input (MAX823/MAX825)
♦ No External Components
MAX823/MAX824/MAX825
5-Pin Microprocessor Supervisory Circuits With
Watchdog Timer and Manual Reset
________________________________________________________________ Maxim Integrated Products 1
1
5
2
3
4
1
5
2
3
4
1
5
2
3
4
GND
WDI
V
CC
MAX823
SOT23/SC70
TOP VIEW
MR
RESET
GND
WDI
RESET
V
CC
MAX824
SOT23/SC70
RESET
GND
MR
RESET
V
CC
MAX825
SOT23/SC70
RESET
______________________Selector Guide
19-0487; Rev 5; 12/05
†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.
MAX823
Active-Low Reset
✔
Active-High Reset —
FUNCTION
Watchdog Input
✔
MAX824
✔
✔
✔
MAX825
✔
✔
—
Manual Reset Input
✔
—
✔
SUFFIX
RESET
THRESHOLD (V)
L 4.63
M 4.38
T 3.08
S 2.93
R 2.63
Typical Operating Circuit appears at end of data sheet.
Marking Information appears at end of data sheet.
Ordering Information
PART
†
TEMP. RANGE PIN-PACKAGE
MAX823_EXK-T
-40°C to +85°C
5 SC70-5
MAX823_EUK-T
-40°C to +125°C
5 SOT23-5
MAX824_EXK-T
-40°C to +85°C
5 SC70-5
Ordering Information continued at end of data sheet.
Reset Threshold Table
Z (SC70 only) 2.32
Y (SC70 only) 2.19
Pin Configurations
*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.
MAX823/MAX824/MAX825
5-Pin Microprocessor Supervisory Circuits With
Watchdog Timer and Manual Reset
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
CC
= +4.75V to +5.5V for MAX82_L, V
CC
= +4.5V to +5.5V for MAX82_M, V
CC
= +3.15V to +3.6V for MAX82_T, V
CC
= +3V
to +3.6V for MAX82_S, V
CC
= +2.7V to +3.6V for MAX82_R, V
CC
= +2.38V to +2.75V for MAX82_Z, V
CC
= +2.25V to +2.75V for
MAX82_Y, T
A
= T
MIN
to T
MAX
, T
A
= -40°C to +85°C (SC70), T
A
= -40°C to +125°C (SOT23), unless otherwise noted. Typical values
are at T
A
= +25°C.) (Note 1)
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.
V
CC
........................................................................-0.3V to +6.0V
All Other Pins..............................................-0.3V to (V
CC
+ 0.3V)
Input Current, All Pins Except RESET and RESET..............20mA
Output Current, RESET, RESET ..........................................20mA
Continuous Power Dissipation (T
A
= +70°C)
5-Pin SC70 (derate 3.1mW/°C above +70°C)...............247mW
5-Pin SOT23 (derate 7.1mW/°C above +70°C).............571mW
Operating Temperature Range
MAX82_EXK......................................................-40°C to +85°C
MAX82_EUK ...................................................-40°C to +125°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
MAX825T/S/R/Z/Y
PARAMETER SYMBOL MIN TYP MAX UNITS
4.56 4.63 4.70
Supply Current
(SOT23 Only)
I
SUPPLY
38
µA
4.5 12
10 24
4.50 4.75
Operating Voltage Range
MAX825L/M
MAX823L/M
MAX824L/M
1.0 5.5
V
CC
1.2
V
512
MAX823T/S/R/Z/Y
MAX824T/S/R/Z/Y
2.59 2.63 2.66
2.55 2.70T
A
= T
MIN
to T
MAX
T
A
= +25°C
MAX82_R
3.04 3.08 3.11
3.00 3.15T
A
= T
MIN
to T
MAX
T
A
= +25°C
MAX82_T
2.89 2.93 2.96
2.85 3.00T
A
= T
MIN
to T
MAX
T
A
= +25°C
CONDITIONS
MAX82_S
MR unconnected
T
A
= T
MIN
to T
MAX
T
A
= +25°C
MAX82_L
4.31 4.38 4.45
T
A
= 0°C to +70°C
T
A
= T
MIN
to T
MAX
4.25 4.50
WDI and MR
unconnected
T
A
= T
MIN
to T
MAX
T
A
= +25°C
MAX82_M
MAX825T/S/R/Z/Y
Supply Current
(SC70 Only)
I
SUPPLY
26
µA
38
617
MAX825L/M
MAX823L/M
MAX824L/M
412
MAX823T/S/R/Z/Y
MAX824T/S/R/Z/Y
MR unconnected
WDI and MR
unconnected
2.28 2.32 2.35
2.25 2.38
Reset Threshold
V
T
A
= T
MIN
to T
MAX
T
A
= +25°C
MAX82_Z
(SC70 only)
2.16 2.19 2.22
2.13 2.25T
A
= T
MIN
to T
MAX
T
A
= +25°C
MAX82_Y
(SC70 only)
V
RST
MAX823/MAX824/MAX825
5-Pin Microprocessor Supervisory Circuits With
Watchdog Timer and Manual Reset
_______________________________________________________________________________________ 3
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX
UNITS
MAX82_L/M 10
Reset Threshold Hysteresis
MAX82_T/S/R/Z/Y 5
mV
Reset Threshold Temperature
Coefficient
40
ppm/°C
Reset Timeout Period t
RP
140 200 280
ms
V
CC
to RESET Delay V
RST
- V
CC
= 100mV 20 µs
MAX82_L/M, V
CC
= V
RST
max,
I
SOURCE
= 120µA
V
CC -
1.5
V
OH
MAX82_T/S/R/Z/Y, V
CC
= V
RST
max,
I
SOURCE
= 30µA
0.8 ✕ V
CC
MAX82_L/M, V
CC
= V
RST
min,
I
SINK
= 3.2mA
0.4
MAX82_T/S/R/Z/Y V
CC
= V
RST
min,
I
SINK
= 1.2mA
0.3
T
A
= 0°C to +70°C, V
CC
= 1V,
V
CC
falling, I
SINK
= 50µA
0.3
RESET Output Voltage
V
OL
T
A
= T
MIN
to T
MAX
, V
CC
= 1.2V,
V
CC
falling, V
BATT
= 0V, I
SINK
= 100µA
V
MAX82_L/M, RESET = 0V, V
CC
= 5.5V
800
RESET Output Short-Circuit
Current (Note 2)
I
SOURCE
MAX82_T/S/R/Z/Y, RESET = 0V, V
CC
= 3.6V
400
µA
V
OH
V
CC
> 1.8V, I
SOURCE
= 150µA
0.8 ✕ V
CC
MAX824L/M, MAX825L/M,
V
CC
= V
RST
max, I
SINK
= 3.2mA
0.4
RESET Output Voltage
V
OL
MAX824T/S/R/Z/Y, MAX825T/S/R/Z/Y,
V
CC
= V
RST
max, I
SINK
= 1.2mA
0.3
V
WATCHDOG INPUT (MAX823/MAX824)
Watchdog Timeout Period t
WD
1.12 1.60 2.40
s
WDI Pulse Width t
WDI
V
IL
= 0.4V, V
IH
= 0.8
✕
V
CC
50 ns
V
IL
0.3
✕
V
CC
WDI Input Voltage (Note 3)
V
IH
0.7
✕
V
CC
V
WDI = V
CC
, time average
120 160
WDI Input Current (Note 4)
WDI = 0, time average -20
-15
µA
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= +4.75V to +5.5V for MAX82_L, V
CC
= +4.5V to +5.5V for MAX82_M, V
CC
= +3.15V to +3.6V for MAX82_T, V
CC
= +3V
to +3.6V for MAX82_S, V
CC
= +2.7V to +3.6V for MAX82_R, V
CC
= +2.38V to +2.75V for MAX82_Z, V
CC
= +2.25V to +2.75V for
MAX82_Y, T
A
= T
MIN
to T
MAX
, T
A
= -40°C to +85°C (SC70), T
A
= -40°C to +125°C (SOT23), unless otherwise noted. Typical values
are at T
A
= +25°C.) (Note 1)
P1-P3P4-P6P7-P9P10-P10

MAX825SEUK+T

Mfr. #:
Buy MAX825SEUK+T
Manufacturer:
Maxim Integrated
Description:
Supervisory Circuits 5-Pin MPU Supervisor
Lifecycle:
New from this manufacturer.
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