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MAX690REPA+

P1-P3P4-P6P7-P9P10-P12
MAX690T/S/R, 704T/S/R, 802T/S/R, 804–806T/S/R
3.0V/3.3V Microprocessor Supervisory Circuits
10 ______________________________________________________________________________________
MAX690T/S/R
MAX704T/S/R
MAX802T/S/R
MAX804T/S/R
MAX805T/S/R
MAX806T/S/R
V
CC
GND
0V
TO μP
V
L
= R
1
V
PFT
PFI
PFO
R
1
R
2
R
3
*OPTIONAL
C1*
V
IN
V
TRIP
V
IN
PFO
0V
V
H
V
L
R
1
+ R
2
R
2
V
H
= (V
PFT
+ V
PFH
) (R
1
)
V
TRIP
= V
PFT
+
R
1
1
+
R
2
1
R
3
1
–
R
3
V
CC
V
PFT
= 1.237V
V
PFH
= 10mV
WHERE
V
CC
GND
TO μP
PFI
PFO
R
1
R
2
R
3
*OPTIONAL
C1*
V
IN
R
1
+ R
2
R
2
V
H
= R
1
(V
PFT
+ V
PFH
)
V
TRIP
= V
PFT
+
R
1
1
+
R
2
1
R
3
1
–
R
3
(V
CC -
V
D
)
V
PFT
= 1.237V
V
PFH
= 10mV
V
D
= DIODE FORWARD VOLTAGE DROP
V
L
= V
TRIP
WHERE
MAX690T/S/R
MAX704T/S/R
MAX802T/S/R
MAX804T/S/R
MAX805T/S/R
MAX806T/S/R
0V
PFO
0V
V
H
V
IN
V
TRIP
ba
( )
( )
( )
( )
+
R
1
1
+
R
2
1
R
3
1
( )
MAX690T/S/R
MAX704T/S/R
MAX802T/S/R
MAX804T/S/R
MAX805T/S/R
MAX806T/S/R
V
CC
GND
PFI PFO
R
1
R
2
V-
0V
V-
PFO
V
TRIP
V
L
V
PFT
= 1.237V
V
PFH
= 10mV
WHERE
3.0V OR 3.3V
V
TRIP
= R
2
+
R
1
1
)
(
R
2
1
–
R
1
V
CC
(V
PFT
+ V
PFH
)
V
L
= R
2
+
R
1
1
)
(
R
2
1
–
R
1
V
CC
(V
PFT
)
NOTE: V
TRIP
IS NEGATIVE
V
CC
MAX690T/S/R
MAX704T/S/R
MAX802T/S/R
MAX804T/S/R
MAX805T/S/R
MAX806T/S/R
V
CC
GND
PFI PFO
R
1
R
2
PFO
V
TRIP
V
H
* MAX704T/S/R,
MAX806T/S/R ONLY
3.0V OR 3.3V
V
IN
V
TRIP
=
)
(
R
2
R
1
+
R
2
V
PFT
V
H
=
(V
PFT
+
V
PFH
)
V
CC
V
IN
MR
*
ba
)
(
R
2
R
1
+
R
2
Figure 4. a) Adding Additional Hysteresis to the Power-Fail Comparator b) Shifting the Additional Hysteresis above V
PFT
Figure 5. Using the Power-Fail Comparator to Monitor an Additional Power Supply
MAX690T/S/R, 704T/S/R, 802T/S/R, 804–806T/S/R
3.0V/3.3V Microprocessor Supervisory Circuits
______________________________________________________________________________________ 11
MAX690T/S/R
MAX704T/S/R
MAX802T/S/R
MAX806T/S/R
V
CC
GND
RESET
V
CC
GND
4.7kΩ
RESET
μP
BUFFERED RESET TO OTHER SYSTEM COMPONENTS
100
0
10 100 1000
20
DS690-806 fig7
RESET COMPARATOR OVERDRIVE (V
RST
- V
CC
) (mV)
MAXIMUM TRANSIENT DURATION (μs)
40
60
80
V
CC
= 3.3V
T
A
= +25°C
Figure 6. Interfacing to µPs with Bidirectional Reset I/O
Figure 7. Maximum Transient Duration without Causing a
Reset Pulse vs. Reset Comparator Overdrive
MAX704T/S/R
MAX806T/S/R
V
OUT
RESET
VBATT
V
CC
GND
0.1µF
3.6V
PFI
MR
0.1µF 0.1µF
RAM
μP
3.0V OR 3.3V
_Typical Operating Circuits (cont.)
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.
12 __________________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.
MAX690T/S/R, 704T/S/R, 802T/S/R, 804–806T/S/R
3.0V/3.3V Microprocessor Supervisory Circuits
_Ordering Information (continued) ___________________Chip Topography
PART** TEMP RANGE
MAX704_CPA
0°C to +70°C
MAX704_CSA 0°C to +70°C
MAX704_C/D 0°C to +70°C Dice*
8 SO
8 Plastic DIP
PIN-PACKAGE
MAX704_EPA -40°C to +85°C
MAX704_ESA -40°C to +85°C
MAX704_MJA -55°C to +125°C 8 CERDIP
8 SO
8 Plastic DIP
MAX802_CPA
0°C to +70°C
MAX802_CSA 0°C to +70°C
MAX802_C/D 0°C to +70°C Dice*
8 SO
8 Plastic DIP
MAX802_EPA -40°C to +85°C
MAX802_ESA -40°C to +85°C
MAX802_MJA -55°C to +125°C 8 CERDIP
8 SO
8 Plastic DIP
MAX804_CPA
0°C to +70°C
MAX804_CSA 0°C to +70°C
MAX804_C/D 0°C to +70°C Dice*
8 SO
8 Plastic DIP
MAX804_EPA -40°C to +85°C
MAX804_ESA -40°C to +85°C
MAX804_MJA -55°C to +125°C 8 CERDIP
8 SO
8 Plastic DIP
MAX805_CPA
0°C to +70°C
MAX805_CSA 0°C to +70°C
MAX805_C/D 0°C to +70°C Dice*
8 SO
8 Plastic DIP
MAX805_EPA -40°C to +85°C
MAX805_ESA -40°C to +85°C
MAX805_MJA -55°C to +125°C 8 CERDIP
8 SO
8 Plastic DIP
MAX806_CPA
0°C to +70°C
MAX806_CSA 0°C to +70°C
MAX806_C/D 0°C to +70°C Dice*
8 SO
8 Plastic DIP
MAX806_EPA -40°C to +85°C
MAX806_ESA -40°C to +85°C
MAX806_MJA -55°C to +125°C 8 CERDIP
8 SO
8 Plastic DIP
*Contact factory for dice specifications.
**These parts offer a choice of reset threshold voltage. Select
the letter corresponding to the desired nominal reset threshold
voltage (T = 3.075V, S = 2.925V, R = 2.625V) and insert it into
the blank to complete the part number.
Devices in PDIP and SO packages are available in both leaded
and lead-free packaging. Specify lead free by adding the +
symbol at the end of the part number when ordering. Lead free
not available for CERDIP package.
WDI
[MR]
RESET
(RESET)
GND
V
CC
VBATT
V
OUT
PFI PFO
0.110"
(2.794mm)
0.080"
(2.032mm)
( ) ARE FOR MAX804T/S/R, MAX805T/S/R.
[ ] ARE FOR MAX704T/S/R, MAX806T/S/R.
TRANSISTOR COUNT: 802;
SUBSTRATE IS CONNECTED TO THE HIGHER OF
V
CC
OR VBATT, AND MUST BE FLOATED IN ANY
HYBRID DESIGN.
P1-P3P4-P6P7-P9P10-P12

MAX690REPA+

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Buy MAX690REPA+
Manufacturer:
Maxim Integrated
Description:
Supervisory Circuits MPU Supervisor
Lifecycle:
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