MAX703CPA Maxim Integrated Products, MAX703CPA Datasheet

IC MPU SUPERVISORY CIRCUIT 8-DIP

MAX703CPA

Manufacturer Part Number
MAX703CPA
Description
IC MPU SUPERVISORY CIRCUIT 8-DIP
Manufacturer
Maxim Integrated Products
Type
Battery Backup Circuitr
Datasheet

Specifications of MAX703CPA

Number Of Voltages Monitored
1
Output
Push-Pull, Totem Pole
Reset
Active Low
Reset Timeout
140 ms Minimum
Voltage - Threshold
4.65V
Operating Temperature
0°C ~ 70°C
Mounting Type
Through Hole
Package / Case
8-DIP (0.300", 7.62mm)
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant

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19-0130; Rev 2; 11/05
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,
2) Battery-backup switching for CMOS RAM, CMOS
3) A 1.25V threshold detector for power-fail warning,
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.
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.
UNREGULATED DC
R1
R2
and brownout conditions.
µPs, or other low-power logic circuitry.
low-battery detection, or for monitoring a power
supply other than +5V.
Computers
Controllers
Intelligent Instruments
Automotive Systems
Critical µP Power Monitoring
BATTERY
LITHIUM
3.6V
0.1µF
Typical Operating Circuit
PUSHBUTTON
SWITCH
________________________________________________________________ Maxim Integrated Products
V
PFI
MR
BATT
REGULATED +5V
MAX703
MAX704
Low-Cost Microprocessor Supervisory
General Description
GND
V
CC
RESET
V
PFO
OUT
Applications
V
NMI
V
RESET
CC
CC
MICROPROCESSOR
CMOS RAM
BUS
Circuits with Battery Backup
GND
GND
* Dice are tested at T
** 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.
MAX703C/D
MAX703CPA
MAX703CSA
MAX703EPA
MAX703ESA
MAX703MJA
MAX704C/D
MAX704CPA
MAX704CSA
MAX704EPA
MAX704ESA
MAX704MJA
Battery-Backup Power Switching
Precision Supply-Voltage Monitor
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
TOP VIEW
4.65V (MAX703)
4.40V (MAX704)
PART
V
GND
V
OUT
PFI
CC
A
1
2
4
3
= +25°C only.
-40°C to +85°C
-40°C to +85°C
-55°C to +125°C
-40°C to +85°C
-40°C to +85°C
-55°C to +125°C
TEMP RANGE
Ordering Information
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
DIP/SO
MAX703
MAX704
Pin Configuration
6
8
7
5
V
RESET
MR
PFO
CC
BATT
PIN-PACKAGE
8 CERDIP**
8 CERDIP**
Features
= 1V
8 PDIP
8 PDIP
8 PDIP
8 PDIP
Dice*
Dice*
8 SO
8 SO
8 SO
8 SO
1

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MAX703CPA Summary of contents

Page 1

... 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 PART MAX703C/D MAX703CPA MAX703CSA MAX703EPA Applications MAX703ESA MAX703MJA MAX704C/D MAX704CPA MAX704CSA MAX704EPA MAX704ESA MAX704MJA * Dice are tested Contact factory for availability and processing to MIL-STD-883 ...

Page 2

Low-Cost Microprocessor Supervisory Circuits with Battery Backup ABSOLUTE MAXIMUM RATINGS Terminal Voltage (with respect to GND) V ....................................................................-0.3V to +6. .................................................................-0.3V to +6.0V BATT All Other Inputs (Note 1).........................-0. Input Current V ...............................................................................200mA CC V ..............................................................................50mA ...

Page 3

Low-Cost Microprocessor Supervisory ELECTRICAL CHARACTERISTICS (continued +4.75V to +5.5V for MAX703 PARAMETER SYMBOL Input Threshold Pulse Width RESET Delay Pullup Current PFI ...

Page 4

Low-Cost Microprocessor Supervisory Circuits with Battery Backup PIN NAME Supply Output for CMOS RAM. When OUT channel MOSFET switch. When +5V Supply Input CC 3 GND Ground Power-Fail Comparator Input. When PFI is less ...

Page 5

Low-Cost Microprocessor Supervisory Detailed Description A µP’s reset input starts the µ known state. Whenever the µ unknown state, it should be held in reset. The MAX703/MAX704 assert reset when V is low, preventing code-execution ...

Page 6

Low-Cost Microprocessor Supervisory Circuits with Battery Backup drops to more than 1V below V switchover comparator shuts off and the supply current falls to less than 1µA. The manual reset input (MR) allows RESET to be acti- vated by a ...

Page 7

Low-Cost Microprocessor Supervisory Ensuring a Valid RESET Output Down to V falls below 1V, the MAX703/MAX704 RESET When V CC output no longer sinks current; it becomes an open cir- cuit. High-impedance CMOS logic inputs can drift to undetermined voltages ...

Page 8

Low-Cost Microprocessor Supervisory Circuits with Battery Backup Using the Power-Fail Comparator In addition to asserting reset at the V voltage, reset can also be asserted at the PFI input threshold voltage. Connect PFO initiate a reset Table ...

Page 9

... 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. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 _____________________ 9 © 2005 Maxim Integrated Products ...

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