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MAX703CPA+

P1-P3P4-P6P7-P9
MAX703/MAX704
Low-Cost Microprocessor Supervisory
Circuits with Battery Backup
________________________________________________________________
Maxim Integrated Products
1
Ordering Information
19-0130; Rev 2; 11/05
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
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General Description
The MAX703/MAX704 microprocessor (µP) supervisory
circuits reduce the complexity and number of compo-
nents required for power-supply monitoring and battery
control functions in µP systems. These devices signifi-
cantly improve system reliability and accuracy com-
pared to that obtained with separate ICs or discrete
components.
The MAX703/MAX704 are available in 8-pin DIP and SO
packages and provide four functions:
1) An active-low reset during power-up, power-down,
and brownout conditions.
2) Battery-backup switching for CMOS RAM, CMOS
µPs, or other low-power logic circuitry.
3) A 1.25V threshold detector for power-fail warning,
low-battery detection, or for monitoring a power
supply other than +5V.
4) An active-low manual reset input.
The MAX703 and MAX704 differ only in their supply-
voltage monitor levels. The MAX703 generates a reset
when the supply drops below 4.65V, while the MAX704
generates a reset below 4.40V.
Features
Applications
*
Dice are tested at T
A
= +25°C only.
**
Contact factory for availability and processing to MIL-STD-883.
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.
PART TEMP RANGE PIN-PACKAGE
MAX703C/D 0°C to +70°C Dice*
MAX703CPA 0°C to +70°C 8 PDIP
MAX703CSA 0°C to +70°C 8 SO
MAX703EPA -40°C to +85°C 8 PDIP
MAX703ESA -40°C to +85°C 8 SO
MAX703MJA -55°C to +125°C 8 CERDIP**
MAX704C/D 0°C to +70°C Dice*
MAX704CPA 0°C to +70°C 8 PDIP
MAX704CSA 0°C to +70°C 8 SO
MAX704EPA -40°C to +85°C 8 PDIP
MAX704ESA -40°C to +85°C 8 SO
MAX704MJA -55°C to +125°C 8 CERDIP**
Battery-Backup Power Switching
Precision Supply-Voltage Monitor
4.65V (MAX703)
4.40V (MAX704)
200ms Reset Pulse Width
Debounced TTL/CMOS-Compatible Manual Reset
Input
200µA Quiescent Current
50nA Quiescent Current in Battery-Backup Mode
Voltage Monitor for Power-Fail or Low-Battery
Warning
8-Pin DIP and SO Packages
Guaranteed RESET Assertion to V
CC
= 1V
Computers
Controllers
Intelligent Instruments
Automotive Systems
Critical µP Power Monitoring
MR
PFOPFI
1
2
8
7
V
BATT
RESETV
CC
GND
V
OUT
DIP/SO
TOP VIEW
3
4
6
5
MAX703
MAX704
Pin Configuration
MAX703
MAX704
UNREGULATED DC REGULATED +5V
CMOS RAM
MICROPROCESSOR
3.6V
LITHIUM
BATTERY
R1
R2
PFI
PUSHBUTTON
SWITCH
0.1µF
V
OUT
V
BATT
V
CC
NMI
V
CC
GND
GND
GND
BUS
MR
RESET
RESET
PFO
V
CC
Typical Operating Circuit
MAX703/MAX704
Low-Cost Microprocessor Supervisory
Circuits with Battery Backup
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
CC
= +4.75V to +5.5V for MAX703, V
CC
= +4.5V to +5.5V for MAX704, V
BATT
= 2.8V, T
A
= T
MIN
to T
MAX
, unless otherwise noted.)
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.
Terminal Voltage (with respect to GND)
V
CC
....................................................................-0.3V to +6.0V
V
BATT
.................................................................-0.3V to +6.0V
All Other Inputs (Note 1).........................-0.3V to (V
CB
+ 0.3V)
Input Current
V
CC
...............................................................................200mA
V
BATT
..............................................................................50mA
GND ................................................................................20mA
Output Current
V
OUT
...............................Short-Circuit Protected for Up to 10s
All Other Outputs ............................................................20mA
Rate-of-Rise V
BATT
, V
CC
.................................................100V/µs
Operating Temperature Range
C Suffix................................................................0°C to +70°C
E Suffix.............................................................-40°C to +85°C
M Suffix ..........................................................-55°C to +125°C
Continuous Power Dissipation (T
A
= +70°C)
8-Pin PDIP (derated 9.09mW/°C above +70°C) ..........727mW
8-Pin SO (derated 5.88mW/°C above +70°C) .............471mW
8-Pin CERDIP (derated 8.00mW/°C above +85°C) .....640mW
Storage Temperature Range .............................-65°C to +160°C
Lead Temperature (soldering, 10s) .................................+300°C
Note 1: V
CB
is the greater of V
CC
and V
BATT
. The input voltage limits on PFI and MR may be exceeded if the current into these pins
is limited to less than 10mA.
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Operating Voltage Range
V
CC
, V
BATT
(Note 2) 0 5.5 V
MAX70_C 200 350
Supply Current (Excluding
I
OUT
)
I
SUPPLY
MAX70_E/M 200 500
µA
T
A
= +25°C 0.05 1.0
I
SUPPLY
in Battery-Backup
Mode (Excluding I
OUT
)
V
CC
= 0V, V
BATT
=
2.8V
T
A
= T
MIN
to T
MAX
5.0
µA
T
A
= +25°C -0.10 +0.02
V
BATT
Standby Current
(Note 3)
5.5V > V
CC
> V
BATT
+ 0.2V
T
A
= T
MIN
to T
MAX
-1.00 +0.02
µA
I
OUT
= 5mA
V
CC
-
0.05
V
CC
-
0.025
V
OUT
Output
I
OUT
= 50mA
V
CC
-
0.5
V
CC
-
0.25
V
V
OUT
in Battery-Backup
Mode
I
OUT
= 250µA, V
CC
< V
BATT
- 0.2V
V
BATT
-
0.1
V
BATT
-
0.02
V
Power-up 20
Battery Switch Threshold
(V
CC
- V
BATT
)
V
CC
< V
RST
Power-down -20
mV
Battery Switchover Hysteresis 40 mV
MAX703 4.50 4.65 4.75
RESET Threshold V
RST
MAX704 4.25 4.40 4.50
V
RESET Threshold Hysteresis 40 mV
RESET Pulse Width t
RST
140 200 280 ms
V
OH
I
SOURCE
= 800µA
V
CC
-
1.5
I
SINK
= 3.2mA 0.4
MAX70_C, V
CC
= 1V, V
CC
falling,
V
BATT
= 0V, I
SINK
= 50µA
0.3
RESET Output Voltage
V
OL
MAX70_E/M, V
CC
= 1.2V, V
CC
falling,
V
BATT
= 0V, I
SINK
= 100µA
0.3
V
MAX703/MAX704
Low-Cost Microprocessor Supervisory
Circuits with Battery Backup
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= +4.75V to +5.5V for MAX703, V
CC
= +4.5V to +5.5V for MAX704, V
BATT
= 2.8V, T
A
= T
MIN
to T
MAX
, unless otherwise noted.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
V
IL
Low 0.8
MR Input Threshold
V
IH
High 2.0
V
MR Pulse Width t
MR
150 ns
MR to RESET Delay t
MD
250 ns
MR Pullup Current MR = 0V 100 250 600 µA
PFI Input Threshold V
CC
= 5V 1.20 1.25 1.30 V
PFI Input Current -25 +0.01 +25 nA
V
OH
I
SOURCE
= 800µA
V
CC
-
1.5
PFO Output Voltage
V
OL
I
SINK
= 3.2mA 0.4
V
Note 2: Either V
CC
or V
BATT
can go to 0V if the other is greater than 2.0V.
Note 3: “-“ = battery-charging current, “+” = battery-discharging current.
OUTPUT VOLTAGE vs. LOAD CURRENT
MAX703 toc01
I
OUT
(mA)
V
OUT
(V)
40302010
4.80
4.85
4.90
4.95
5.00
4.75
050
V
CC
= +5V
V
BATT
= +2.8V
T
A
= +25
°
C
SLOPE = 5
Ω
OUTPUT VOLTAGE vs. LOAD CURRENT
MAX703 toc02
I
OUT
(mA)
V
OUT
(V)
0.80.60.40.2
2.72
2.74
2.76
2.78
2.80
2.70
0 1.0
V
CC
= 0V
V
BATT
= +2.8V
T
A
= +25
°
C
SLOPE = 80
Ω
MAX703 toc03
500ms/div
MAX703 RESET OUTPUT VOLTAGE
vs. SUPPLY VOLTAGE
OV
V
CC
+5V
1V/div
+5V
1V/div
0V
V
BATT
= 0V
T
A
= +25
°
C
RESET
330pF
2kΩ
RESET
RESET
GND
V
CC
V
CC
MAX703 toc04
2µs/div
MAX703 RESET RESPONSE TIME
+5V
+5V
V
CC
1V/div
+4V
0V
T
A
= +25
°
C
RESET
30pF
10kΩ
RESET
RESET
GND
V
CC
V
CC
MAX703 toc05
400ns/div
POWER-FAIL COMPARATOR
RESPONSE TIME
+1.30V
+5V
+1.20V
0V
V
CC
= +5V
T
A
= +25°C
PFI
PFO
30pF
1kΩ
PFO
PFI
+5V
1.25V
MAX703 toc06
400ns/div
POWER-FAIL COMPARATOR
RESPONSE TIME
+1.20V
+1.30V
+3V
0V
PFI
PFO
30pF
PFO
1kΩ
PFI
+5V
1.25V
V
CC
= +5V
T
A
= +25
°
C
Typical Operating Characteristics
(V
CC
= +5V, V
BATT
= 2.8V, T
A
= +25°C, unless otherwise noted.)
P1-P3P4-P6P7-P9

MAX703CPA+

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Buy MAX703CPA+
Manufacturer:
Maxim Integrated
Description:
Supervisory Circuits MPU Supervisor
Lifecycle:
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