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Analog Devices Inc./Maxim Integrated MAX703CPA+
- Part No.:
- MAX703CPA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX703CPA+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,134
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Product details
Overview
MAX703CPA+ from Maxim Integrated is a low-cost microprocessor supervisory circuit providing active-low reset, battery-backup switching, 1.25V power-fail detection, and manual reset input in an 8-pin PDIP package. It asserts reset below 4.65V with 200ms pulse width, supports CMOS RAM backup during brownout, and guarantees RESET assertion down to VCC = 1V. Used in critical μP power monitoring for embedded controllers and intelligent instruments.
For engineers reviewing the MAX703CPA+ datasheet, MAX703CPA+ pinout, MAX703CPA+ application, or MAX703CPA+ equivalent, key selection criteria include reset threshold accuracy (4.65V ±150mV), battery switchover hysteresis (40mV), quiescent current (200µA active / 50nA backup mode), and guaranteed operation across 0°C to +70°C.
Technical Context
The MAX703CPA+ integrates four core functions: a precision voltage monitor with 4.65V reset threshold and 40mV hysteresis; a battery switchover circuit using p-channel MOSFETs (5Ω in VCC mode, 80Ω in VBATT mode); a 1.25V reference-based power-fail comparator with PFI/PFO interface; and a debounced TTL/CMOS-compatible manual reset input with 250µA internal pullup.
It operates over VCC = 0–5.5V and VBATT = 0–5.5V, maintains RESET validity down to VCC = 1V during falling edge, and enters ultra-low-power battery-backup mode (<1µA) when VCC falls >1V below VBATT. The device disables PFI comparator and forces PFO low in battery-backup mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.65V ±150mV - ensures reliable μP reset initiation before +5V supply dropout. |
| Reset Pulse Width | 200ms typ - provides sufficient time for μP initialization after power-up or recovery. |
| Supply Current | 200µA typ at +25°C - enables low-power system monitoring without burdening main supply. |
| Battery-Backup Current | 50nA typ - preserves lithium battery life for years in standby RAM retention. |
| Power-Fail Threshold | 1.25V ±50mV - allows precise undervoltage warning for unregulated rails via external divider. |
| Manual Reset Input | TTL/CMOS compatible with 250µA pullup - supports direct switch connection without external components. |
| Operating Temperature | 0°C to +70°C - qualified for commercial-grade embedded control and instrumentation. |
Pinout & Package
MAX703CPA+ uses an 8-pin plastic dual in-line package (PDIP) with 0.3-inch body width and through-hole mounting. Pin 1 is VOUT, pin 8 is VBATT, and all pins are arranged in standard DIP layout per Maxim document 21-0043.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VOUT | RAM supply output | Switches between VCC (via 5Ω p-MOSFET) and VBATT (via 80Ω p-MOSFET) based on reset threshold crossing and switchover hysteresis. |
| 2 - VCC | +5V main supply input | Primary power source; monitored for reset generation and used as substrate reference when active. |
| 3 - GND | Ground reference | Common return for all internal circuits and external loads; must be low-impedance for noise immunity. |
| 4 - PFI | Power-fail comparator input | Accepts divided-down voltage; triggers PFO low when <1.25V - used for early power-fail warning or low-battery detection. |
| 5 - PFO | Power-fail comparator output | Active-low open-drain output; disabled and forced low during battery-backup mode. |
| 6 - MR | Manual reset input | Active-low TTL/CMOS input with internal 250µA pullup; generates 200ms reset pulse on falling edge. |
| 7 - RESET | Reset output | Active-low push-pull output; asserted while VCC < 4.65V and held for 200ms after VCC rises above threshold. |
| 8 - VBATT | Battery backup input | Accepts 2.8V–4.8V lithium cell; powers VOUT and internal circuitry when VCC fails, with automatic switchover hysteresis. |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed RESET assertion to VCC = 1V | Ensures deterministic reset behavior even during deep brownout, preventing μP lockup. |
| 200ms reset pulse width | Meets μP minimum reset hold-time requirements without external timing components. |
| 50nA quiescent current in battery-backup mode | Enables multi-year RAM retention on single CR2032 coin cell without voltage droop. |
| 40mV battery switchover hysteresis | Prevents oscillatory switching during slow VCC decay, ensuring clean RAM power transition. |
| Debounced manual reset input | Eliminates need for external RC debounce network - reduces BOM count and board space. |
Applications
| Industrial Controller Power Monitoring | Embedded Instrumentation Data Retention |
|---|---|
Use Scenario: PLC I/O modules require nonvolatile RAM state preservation during AC line sags or fuse events. IC Role / Device Role / Timing Role: MAX703CPA+ monitors +5V rail, asserts RESET to halt CPU execution, and switches SRAM to lithium backup within 200ms of VCC drop. Use Value: Prevents data corruption and ensures deterministic restart after transient faults without external supervision logic. | Use Scenario: Portable multimeter stores calibration coefficients and measurement history in static RAM. IC Role / Device Role / Timing Role: MAX703CPA+ provides battery-backed VOUT and 200ms RESET hold to freeze CPU state before power loss. Use Value: Enables >10-year data retention on 3.0V lithium cell with no software intervention or EEPROM wear. |
| Computer BIOS/UEFI Power Sequencing | Critical μP System Watchdog Support |
Use Scenario: Legacy PC motherboards use discrete +5V monitoring for POST sequence validation. IC Role / Device Role / Timing Role: MAX703CPA+ replaces discrete resistor-divider + comparator + reset generator with single IC. Use Value: Reduces component count by 7 parts, improves reset threshold accuracy to ±3%, and eliminates trim potentiometers. | Use Scenario: Medical infusion pump requires fail-safe reset if main processor hangs during therapy delivery. IC Role / Device Role / Timing Role: MAX703CPA+ supplies hardware reset signal triggered by external watchdog timer or manual override. Use Value: Provides independent reset path not dependent on firmware, meeting IEC 62304 Class C safety requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX704CPA+ | 4.40V reset threshold (vs. 4.65V), otherwise identical pinout, timing, and features. | Suitable for systems with tighter +5V tolerance (±10%) where earlier reset assertion is required. | Select MAX704CPA+ only if design requires reset at 4.40V; MAX703CPA+ remains optimal for ±5% supplies. |
| MAX705CPA+ | No battery backup; adds CE write-protect and watchdog timer; 4.65V reset; same 8-pin PDIP package. | Used where RAM backup is unnecessary but firmware protection and watchdog timeout are required. | Choose MAX705CPA+ when system needs write-protection or watchdog functionality; MAX703CPA+ is superior for pure battery-switching applications. |
Compared with MAX704CPA+, MAX703CPA+ provides higher reset threshold for improved noise margin on stable +5V rails; compared with MAX705CPA+, it delivers dedicated battery switchover without sacrificing pin compatibility or adding unused watchdog circuitry.
Availability
MAX703CPA+ is available at Aetrix Electronics and suitable for industrial controller power monitoring, embedded instrumentation data retention, and computer BIOS/UEFI power sequencing requiring stable component supply across commercial temperature range.
Supply support for MAX703CPA+ 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 precision analog and mixed-signal ICs for power, sensing, and connectivity applications.
The MAX703 product line delivers cost-optimized supervisory circuits focused on μP reset generation, battery-backed RAM support, and power-fail warning in industrial and instrumentation systems.
FAQ
What is the reset threshold voltage for MAX703CPA+?
The MAX703CPA+ has a guaranteed reset threshold of 4.65V with ±150mV tolerance. It asserts the active-low RESET output when VCC drops below this level and holds it low for 200ms after VCC rises above threshold. This value is fixed and differs from the MAX704CPA+ (4.40V), making MAX703CPA+ ideal for +5V ±5% supply systems.
How does MAX703CPA+ handle battery backup switching?
The MAX703CPA+ automatically switches VOUT from VCC to VBATT when VCC falls below 4.65V, provided VBATT exceeds VCC by at least 20mV. It incorporates 40mV hysteresis to prevent chatter during slow VCC decay. In battery-backup mode, quiescent current drops to 50nA, enabling multi-year RAM retention on a single lithium cell.
Can MAX703CPA+ operate with VCC below 1V?
The MAX703CPA+ guarantees RESET assertion down to VCC = 1V during power-down, but RESET output becomes high-impedance below that point. To ensure valid logic-low state, a 100kΩ pulldown resistor on the RESET pin is recommended when VCC may fall below 1V - this prevents floating inputs from causing undefined μP behavior.
What is the function of the PFI and PFO pins on MAX703CPA+?
PFI is a 1.25V comparator input used to monitor auxiliary voltages (e.g., unregulated DC rails) via external resistive dividers; PFO is its active-low open-drain output. When PFI < 1.25V, PFO goes low to signal impending power failure. In battery-backup mode, the comparator is disabled and PFO is forced low regardless of PFI voltage.
Is MAX703CPA+ RoHS-compliant and lead-free?
Yes, MAX703CPA+ is RoHS-compliant and lead(Pb)-free. The "+" suffix in the part number explicitly denotes lead-free packaging per Maxim Integrated's ordering convention. It is supplied in 8-pin PDIP with matte tin lead finish and meets JEDEC J-STD-609 Category 1 requirements.
MAX703CPA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Active
- 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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
MAX703CPA+ FAQ
1.How can I place an order for MAX703CPA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX703CPA+ 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 MAX703CPA+ reliable?
The price and inventory of MAX703CPA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX703CPA+ is usually 5 days.
3.What payment methods are accepted for MAX703CPA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX703CPA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX703CPA+?
MAX703CPA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX703CPA+ 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 MAX703CPA+?
For technical support, including MAX703CPA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX703CPA+ requirements.
6.How does Aetrix verify that MAX703CPA+ is sourced from the original manufacturer or authorized distributors?
All MAX703CPA+ 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 MAX703CPA+ meets industry standards.
7.What is the process for return or replacement of MAX703CPA+?
All MAX703CPA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX703CPA+, 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 MAX703CPA+ part is unused and in its original packaging.
Return procedure for MAX703CPA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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