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Analog Devices Inc./Maxim Integrated MAX703MJA
- Part No.:
- MAX703MJA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-CDIP (0.300", 7.62mm)
- Datasheet:
-
MAX703MJA.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8CERDIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,972
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Product details
Overview
MAX703MJA from Maxim Integrated is a military-grade microprocessor supervisory circuit designed for critical power monitoring and battery-backup switching in high-reliability embedded systems. It provides active-low reset assertion at 4.65V supply threshold, 200ms reset pulse width, 50nA quiescent current in battery-backup mode, and precision 1.25V power-fail comparator input - enabling reliable operation in aerospace, defense, and downhole instrumentation.
For engineers reviewing the MAX703MJA datasheet, MAX703MJA pinout, MAX703MJA application, or MAX703MJA equivalent, key selection criteria include its -55°C to +125°C operating range, CERDIP-8 hermetic package, guaranteed RESET assertion down to VCC = 1V, and integrated battery switchover with 40mV hysteresis - all essential for mission-critical μP reset integrity under extreme thermal and voltage transients.
Technical Context
The MAX703MJA integrates four tightly coupled functions: a precision bandgap-based supply monitor with 4.65V reset threshold and 40mV hysteresis; a debounced TTL/CMOS-compatible manual reset input with 250µA internal pullup; a 1.25V reference comparator for external power-fail or low-battery detection; and an automatic battery-backup switchover circuit using p-channel MOSFET switches (5Ω in VCC path, 80Ω in VBATT path).
Its reset generator asserts RESET low during power-up, brownout, or power-down until VCC exceeds 4.65V and holds low for 200ms thereafter; in battery-backup mode, it disables PFI/PFO, forces RESET low, disconnects VCC from VOUT, and powers VOUT directly from VBATT while drawing <1µA when VCC is >1V below VBATT.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.65V ±150mV - ensures deterministic μP reset initiation before logic corruption occurs during 5V supply collapse. |
| Reset Pulse Width | 140–280ms (typ. 200ms) - guarantees sufficient time for full μP initialization and peripheral stabilization after power recovery. |
| Supply Current (Active) | 200–500µA - enables low-power operation in industrial controllers without compromising reset timing accuracy. |
| Quiescent Current (Battery Mode) | 5.0µA max over full temp range - preserves lithium battery life for years in unpowered standby applications. |
| Power-Fail Comparator Threshold | 1.25V ±50mV - supports accurate undervoltage warning for unregulated supplies via external resistor divider. |
| Battery Switchover Hysteresis | 40mV - prevents oscillatory switching between VCC and VBATT during slow-ramping brownout conditions. |
| Operating Temperature Range | -55°C to +125°C - qualified per MIL-STD-883 for deployment in avionics, missile guidance, and oilfield electronics. |
| Package | 8-pin CERDIP (J8+2) - hermetically sealed ceramic dual-in-line package with lead(Pb)-free option available. |
Pinout & Package
MAX703MJA is housed in an 8-pin CERDIP (ceramic dual-in-line package), offering hermetic sealing and superior thermal/mechanical stability for harsh-environment applications. The package dimensions conform to outline 21-0045 and supports lead(Pb)-free assembly when ordered with "+" suffix.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VOUT | CMOS RAM supply output | Switches between VCC (via 5Ω p-MOSFET) and VBATT (via 80Ω p-MOSFET) based on supply status; maintains RAM power during brownout. |
| 2 - VCC | +5V main supply input | Primary power source; monitored for reset generation; powers internal circuitry unless in battery-backup mode. |
| 3 - GND | Ground reference | Common return path for all analog and digital functions; substrate connection point in normal operation. |
| 4 - PFI | Power-fail comparator input | Accepts external voltage divider to detect falling unregulated supply; triggers PFO low when <1.25V. |
| 5 - PFO | Power-fail comparator output | Open-drain output asserted low during power-fail; disabled and forced low in battery-backup mode. |
| 6 - MR | Manual reset input | Active-low TTL/CMOS-compatible input with 250µA internal pullup; debounced by 200ms reset timer. |
| 7 - RESET | Reset output | Active-low open-drain output asserted during VCC <4.65V and held for 200ms after recovery; valid down to VCC = 1V. |
| 8 - VBATT | Backup battery input | Source for RAM backup power; enables automatic switchover when VCC drops below reset threshold and VBATT > VCC + 20mV. |
Key Features
| Feature | Design Value |
|---|---|
| Precision 4.65V reset threshold | Guaranteed ±150mV tolerance over -55°C to +125°C ensures consistent reset behavior across extreme temperature excursions. |
| 200ms reset pulse width | Internally timed minimum duration prevents premature μP release before clock stabilization and memory initialization complete. |
| 50nA battery-backup quiescent current | Enables multi-year operation from single 3.6V lithium cell in powered-off systems without RAM data loss. |
| Automatic battery switchover with hysteresis | 40mV hysteresis eliminates chatter during marginal VCC transitions; 80Ω VBATT switch minimizes voltage drop to RAM. |
| 1.25V power-fail comparator | Allows early warning of supply degradation via external resistor network - critical for graceful shutdown in safety-critical systems. |
| Guaranteed RESET assertion to VCC = 1V | Ensures reset remains active even during deep brownout, preventing undefined μP states when supply collapses near ground. |
Applications
| Aerospace Avionics | Downhole Oilfield Electronics |
|---|---|
|
Use Scenario: Real-time flight control unit operating in jet engine bays where ambient temperature swings from -55°C at altitude to +125°C near turbine sections. IC Role / Device Role / Timing Role: Supervisory circuit providing fail-safe reset initiation, RAM backup during transient brownouts, and power-fail interrupt for emergency state capture. Use Value: Hermetic CERDIP package and -55°C to +125°C qualification ensure continuous operation where plastic packages would crack or delaminate. |
Use Scenario: Logging-while-drilling (LWD) tool deployed at 175°C wellbore temperatures with intermittent power interruptions during tripping operations. IC Role / Device Role / Timing Role: Battery-backed supervisor maintaining SRAM contents and asserting controlled reset during power reapplication after 10+ minute outages. Use Value: 50nA battery-backup current extends 3.6V lithium cell life beyond 5 years; 40mV switchover hysteresis prevents false switching during slow VCC ramp-up. |
| Military Vehicle Computing | Nuclear Instrumentation |
|
Use Scenario: Ruggedized vehicle-mounted tactical computer subjected to shock, vibration, and wide thermal cycling in desert/winter deployments. IC Role / Device Role / Timing Role: Primary reset generator and RAM power manager ensuring deterministic boot sequence after engine start or battery jump-start events. Use Value: Guaranteed RESET assertion down to VCC = 1V prevents spurious execution during cranking; 200ms pulse accommodates slow-rising alternator output. |
Use Scenario: Radiation-hardened reactor monitoring system requiring decades-long unattended operation with zero data corruption risk. IC Role / Device Role / Timing Role: Fault-tolerant supervisor detecting supply anomalies and preserving sensor calibration data in battery-backed CMOS RAM during grid failures. Use Value: CERDIP hermeticity blocks moisture ingress and ionizing radiation effects; 1.25V PFI comparator enables precise low-voltage warning before critical sensor dropout. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX703EPA | Same core functionality but rated for -40°C to +85°C in 8-pin PDIP; lacks MIL-qualified screening and hermetic seal. | Suitable for commercial/industrial environments without extended temperature or reliability requirements. | Select MAX703EPA only if operating temperature stays within -40°C to +85°C and hermetic packaging is unnecessary. |
| MAX705CPA | No battery-backup capability; includes watchdog timer and CE write-protect; reset threshold 4.65V; operates 0°C to +70°C. | Used where RAM backup is not required but system-level watchdog supervision and memory protection are critical. | Choose MAX705CPA when watchdog timeout (1.6s) and write-protect features outweigh need for VBATT switchover. |
Compared with MAX703MJA, MAX703EPA offers lower cost and wider availability but sacrifices military-grade temperature range and hermetic reliability, while MAX705CPA trades battery backup for watchdog and memory protection - making MAX703MJA uniquely suited for long-duration, unattended, extreme-environment RAM retention.
Availability
MAX703MJA is available at Aetrix Electronics and suitable for aerospace avionics, downhole instrumentation, and military vehicle computing requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for MAX703MJA includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Maxim Integrated (now part of Analog Devices) designs high-performance analog and mixed-signal ICs for demanding applications in industrial, automotive, communications, and computing markets.
The MAX703 product line delivers cost-effective, highly integrated microprocessor supervisory circuits optimized for power integrity, battery backup, and reset reliability in embedded systems exposed to voltage transients and thermal extremes.
FAQ
What is the guaranteed operating temperature range for MAX703MJA?
The MAX703MJA is specified for continuous operation from -55°C to +125°C and is processed to MIL-STD-883 requirements. This range is validated through temperature cycling, burn-in, and parametric testing per military screening standards - making it suitable for deployment in jet engines, missile guidance systems, and geothermal drilling tools where plastic-packaged alternatives would fail.
Does MAX703MJA support battery-backed RAM retention during complete VCC loss?
Yes, MAX703MJA automatically switches VOUT from VCC to VBATT when VCC falls below the 4.65V reset threshold and VBATT exceeds VCC by at least 20mV. In this mode, VOUT is supplied through an 80Ω p-channel MOSFET from VBATT, while internal current drops to <1µA when VCC is more than 1V below VBATT - enabling multi-year data retention from a single 3.6V lithium cell.
How does the power-fail comparator function in MAX703MJA?
The MAX703MJA's PFI input compares external voltage against a 1.25V internal reference; when PFI falls below 1.25V, PFO goes low to signal impending supply failure. During battery-backup mode, the comparator is disabled and PFO is forced low. This allows early warning of unregulated supply collapse - for example, triggering μP interrupt-driven save routines before regulated +5V drops out.
Can MAX703MJA generate reset pulses from both supply voltage and manual input?
Yes, MAX703MJA asserts RESET low in response to three independent conditions: (1) VCC dropping below 4.65V, (2) MR pin pulled below 0.8V (TTL/CMOS-compatible), or (3) PFO driven low and connected to MR. All reset events produce a minimum 140ms pulse (typ. 200ms), with internal timing ensuring deterministic release after recovery - critical for avoiding race conditions in complex boot sequences.
What package type and sealing method does MAX703MJA use?
MAX703MJA uses an 8-pin CERDIP (ceramic dual-in-line package) with hermetic glass-to-metal seals, conforming to outline 21-0045. This construction prevents moisture ingress, inhibits corrosion, and withstands thermal shock - essential for long-term reliability in high-humidity, high-radiation, or high-vibration environments where plastic SO or PDIP packages would degrade.
MAX703MJA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-CDIP (0.300", 7.62mm)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Battery Backup Circuit
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.65V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-CERDIP
MAX703MJA FAQ
1.How can I place an order for MAX703MJA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX703MJA on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MAX703MJA reliable?
The price and inventory of MAX703MJA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX703MJA is usually 5 days.
3.What payment methods are accepted for MAX703MJA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX703MJA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX703MJA?
MAX703MJA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX703MJA order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MAX703MJA?
For technical support, including MAX703MJA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX703MJA requirements.
6.How does Aetrix verify that MAX703MJA is sourced from the original manufacturer or authorized distributors?
All MAX703MJA products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MAX703MJA meets industry standards.
7.What is the process for return or replacement of MAX703MJA?
All MAX703MJA units undergo pre-shipment inspection (PSI). If there is an issue with MAX703MJA, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MAX703MJA part is unused and in its original packaging.
Return procedure for MAX703MJA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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