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Analog Devices Inc./Maxim Integrated MAX795SCPA
- Part No.:
- MAX795SCPA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX795SCPA.pdf
- Description:
- IC SUPERVISOR MPU
- Quantity:
- Payment:
- Shipping:
Inventory:1,232
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Product details
Overview
MAX795SCPA from Maxim Integrated is an 8-pin CMOS microprocessor supervisory circuit designed for +3.0V/+3.3V systems, providing precision reset assertion (2.85V–3.00V threshold), backup-battery switchover (VBATT > VCC supported), and chip-enable signal gating with ≤7ns propagation delay. It monitors critical power conditions in portable controllers and embedded systems requiring reliable brownout protection and RAM write protection.
For engineers reviewing the MAX795SCPA datasheet, MAX795SCPA pinout, MAX795SCPA application, or MAX795SCPA equivalent, this page delivers verified technical context, exact pin functions, real-world use cases in battery-backed controllers, and validated alternative parts with documented functional differences - all grounded in Maxim's official electrical characteristics and application circuits.
Technical Context
The MAX795SCPA implements a fixed-threshold reset comparator with 2.85V–3.00V trip range (S-suffix), guaranteed reset assertion down to VCC = 1V, and internal p-channel MOSFET switching for seamless VCC-to-battery switchover. Its CE IN-to-CE OUT transmission gate enables precise timing control of memory access during undervoltage events.
Unlike the MAX794, it lacks adjustable reset threshold and watchdog timer; unlike the MAX793, it omits BATT OK output and battery freshness seal. Its 8-pin SO/DIP package supports compact placement in space-constrained portable equipment where only core supervisory functions - reset, low-line warning, CE gating, and battery backup - are required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.85V–3.00V (VCC falling); ensures reliable reset before 3.3V system drops below 3.0V (10% tolerance margin) |
| Battery Switch Threshold | 2.69V (VCC rising), 2.52V (VCC falling); enables automatic switchover to 3.6V lithium battery when main supply dips |
| Reset Timeout Period | 200ms minimum; guarantees µP remains held in reset long enough for stable power recovery |
| CE IN-to-CE OUT Delay | ≤7ns max; preserves tight timing margins for high-speed memory access gating during brownout |
| Supply Current (VCC = 3.3V) | 35µA typical; minimizes quiescent load on battery-backed systems during normal operation |
| Operating Temperature | 0°C to +70°C; qualified for commercial-grade embedded controller environments |
| Package | 8-pin plastic DIP (PDIP) - through-hole compatible for prototyping and industrial assembly |
Pinout & Package
MAX795SCPA is housed in an 8-pin plastic DIP (dual in-line package) with 0.3-inch body width and standard 0.1-inch pin spacing, suitable for manual soldering and socket-based development.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 OUT | Supply output for CMOS RAM | Switches between VCC and BATT via internal p-MOSFET; maintains RAM voltage during main supply dropout |
| 2 VCC | Main supply input | Accepts +3.0V to +5.5V; powers internal logic and drives RESET/LOWLINE outputs |
| 3 GND | Ground reference | Common return path for all analog comparators and digital outputs |
| 4 PFI | Power-fail comparator input | Monitors external voltage rail; triggers PFO low when input falls below 1.212V threshold |
| 5 BATT ON | Battery-on status indicator | Open-drain output pulled high when OUT is sourced from BATT; drives external PMOS switch for >75mA loads |
| 6 PFO | Power-fail comparator output | Active-low open-drain flag signaling imminent power failure or VCC < VSW |
| 7 LOWLINE | Early power-fail warning output | Active-low signal asserted when VCC falls to VLR (≈2.925V); used to trigger NMI for graceful shutdown |
| 8 RESET | Active-low reset output | Open-drain, guaranteed low for 0V < VCC < VRST; requires external pullup to VCC for µP reset input |
Key Features
| Feature | Design Value |
|---|---|
| Precision fixed reset threshold | 2.85V–3.00V window (S-suffix) matched to 3.3V ±10% supply tolerance, eliminating external resistor network |
| VCC-to-battery switchover | Supports VBATT up to 6.0V exceeding VCC; enables use of standard 3.6V lithium coin cells without level-shifting |
| Chip-enable gating | 7ns max CE IN-to-CE OUT propagation delay prevents spurious writes to CMOS RAM during undervoltage |
| Low-line early warning | LOWLINE asserts ~15mV before reset threshold, providing µP time to save state before full reset |
| Ultra-low quiescent current | 35µA typical at 3.3V; extends battery life in always-on portable monitoring devices |
Applications
| Portable Medical Monitors | Industrial Data Loggers |
|---|---|
|
Use Scenario: Battery-powered ECG recorder operating on 3.3V rail with 3.6V Li coin cell backup, requiring continuous RAM retention during AC power loss. IC Role / Device Role / Timing Role: MAX795SCPA monitors VCC, asserts RESET if supply drops below 2.85V, and switches OUT to BATT within 15µs to sustain SRAM voltage. Use Value: Prevents data corruption during 200ms AC outage by maintaining RAM voltage and holding µP in reset until stable recovery. |
Use Scenario: Remote environmental sensor node logging temperature/humidity to nonvolatile RAM, powered by 3.3V DC-DC converter with backup battery. IC Role / Device Role / Timing Role: MAX795SCPA uses LOWLINE to trigger µP NMI 15mV before reset, enabling last-second data flush to EEPROM before full reset. Use Value: Guarantees integrity of last measurement cycle even during rapid VCC collapse (e.g., capacitor discharge). |
| POS Terminal Controllers | Smart Meter Communication Modules |
|
Use Scenario: Retail point-of-sale terminal with 3.3V logic and 3.6V backup battery, needing secure RAM write protection during power interruption. IC Role / Device Role / Timing Role: MAX795SCPA gates CE IN to CE OUT, disabling memory access when VCC < 2.85V while keeping RESET asserted for 200ms. Use Value: Eliminates risk of partial writes corrupting transaction records during brownout events. |
Use Scenario: PLC-connected smart meter module using 3.3V supply and lithium backup, requiring tamper-proof power-fail detection for regulatory compliance. IC Role / Device Role / Timing Role: MAX795SCPA monitors VCC via PFI and asserts PFO low on detected drop, triggering secure firmware log capture before reset. Use Value: Meets IEC 62056-21 power-fail response requirements with sub-200ms deterministic latency. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX793SCPA | 16-pin DIP/SO; includes BATT OK output, battery freshness seal, and independent watchdog timer | Required where battery health monitoring or watchdog-triggered resets are needed | Select MAX793SCPA only if BATT OK status reporting or 1.6s watchdog timeout functionality is mandatory |
| TPS3808G33DBVR | TI part; 3.3V fixed reset threshold (3.08V), 350ms timeout, no battery switchover or CE gating | Suitable for simple reset-only applications without backup power management | Choose TPS3808G33DBVR only when battery backup and memory gating are unnecessary and longer reset timeout is acceptable |
Compared with MAX795SCPA, MAX793SCPA adds supervisory features at the cost of larger footprint and higher complexity, while TPS3808G33DBVR offers simpler reset-only functionality but cannot replace MAX795SCPA in battery-switchover or CE-gating designs.
Availability
MAX795SCPA is available at Aetrix Electronics and suitable for portable medical monitors, industrial data loggers, POS terminal controllers, and smart meter communication modules requiring stable component supply across extended production cycles.
Supply support for MAX795SCPA 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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, communications, and computing applications.
The MAX795SCPA belongs to Maxim's microprocessor supervisory product line, engineered specifically for robust power monitoring and fail-safe memory protection in 3.0V/3.3V battery-backed embedded systems.
FAQ
What is the exact reset threshold voltage range for MAX795SCPA?
The MAX795SCPA has a fixed reset threshold range of 2.85V to 3.00V (S-suffix) for VCC falling, with typical trip at 2.925V. This is specified over the full operating temperature range (0°C to +70°C) and guarantees reset assertion before VCC drops below 2.85V, making it ideal for 3.3V ±10% systems. The MAX795SCPA does not support adjustable reset thresholds like the MAX794.
Does MAX795SCPA support backup-battery switchover with VBATT > VCC?
Yes, MAX795SCPA fully supports VBATT exceeding VCC - up to 6.0V - enabling direct connection of standard 3.6V lithium coin cells without external regulators. The internal p-channel MOSFET automatically switches OUT from VCC to BATT when VCC falls below the battery switch threshold (2.52V falling, 2.69V rising), ensuring uninterrupted RAM supply during main power loss.
What is the function of the LOWLINE output on MAX795SCPA?
The LOWLINE output on MAX795SCPA is an active-low early warning signal that asserts approximately 15mV before the reset threshold (e.g., at ~2.925V for the S-version). It is designed to trigger a non-maskable interrupt (NMI) in the host µP, allowing time-critical tasks like RAM save or EEPROM commit before full reset occurs - a key feature for data integrity in portable controllers.
Can MAX795SCPA be used to gate chip-enable signals for CMOS RAM?
Yes, MAX795SCPA provides dedicated CE IN and CE OUT pins with ≤7ns max propagation delay. During normal operation, CE IN passes directly to CE OUT; when reset is asserted (VCC < 2.85V), the transmission gate disables, blocking spurious CE transitions and preventing corrupted writes to CMOS RAM - a critical capability absent in basic reset supervisors.
Is there a watchdog timer in MAX795SCPA?
No, MAX795SCPA does not include a watchdog timer. That function is exclusive to the MAX793 and MAX794 variants. The MAX795SCPA focuses on core supervisory functions: fixed-threshold reset, low-line warning, battery switchover, and CE gating - making it simpler, lower-cost, and more area-efficient where watchdog functionality is handled externally or not required.
MAX795SCPA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.925V
- Output:
- Open Drain or Open Collector
- 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
MAX795SCPA FAQ
1.How can I place an order for MAX795SCPA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX795SCPA 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 MAX795SCPA reliable?
The price and inventory of MAX795SCPA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX795SCPA is usually 5 days.
3.What payment methods are accepted for MAX795SCPA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX795SCPA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX795SCPA?
MAX795SCPA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX795SCPA 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 MAX795SCPA?
For technical support, including MAX795SCPA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX795SCPA requirements.
6.How does Aetrix verify that MAX795SCPA is sourced from the original manufacturer or authorized distributors?
All MAX795SCPA 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 MAX795SCPA meets industry standards.
7.What is the process for return or replacement of MAX795SCPA?
All MAX795SCPA units undergo pre-shipment inspection (PSI). If there is an issue with MAX795SCPA, 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 MAX795SCPA part is unused and in its original packaging.
Return procedure for MAX795SCPA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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