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Analog Devices Inc./Maxim Integrated MAX795SCPA+
- Part No.:
- MAX795SCPA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- -
- Datasheet:
-
MAX795SCPA+.pdf
- Description:
- IC SUPERVISOR MPU 8-DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,960
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Product details
Overview
MAX795SCPA+ from Maxim Integrated is an 8-pin 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), chip-enable gating with ≤7ns propagation delay, and guaranteed reset hold-down to VCC = 1V. It safeguards CMOS RAM in battery-backed embedded controllers during brownout and power-fail events.
For engineers reviewing the MAX795SCPA+ datasheet, MAX795SCPA+ pinout, MAX795SCPA+ application, or MAX795SCPA+ equivalent, key selection criteria include its fixed S-suffix reset threshold (2.85V–3.00V), 8-pin SO/DIP package compatibility, battery-switching hysteresis, CE IN-to-CE OUT timing, and absence of watchdog or BATT OK outputs compared to MAX793/MAX794 variants.
Technical Context
The MAX795SCPA+ implements a precision voltage-monitoring comparator with 10mV typical hysteresis to prevent oscillation during VCC transitions near the reset threshold. Its internal p-channel MOSFET switch enables seamless switchover between VCC and VBATT, with battery-switch thresholds of 2.41V (VCC falling) and 2.68V (VCC rising) at TA = +25°C.
Unlike the MAX793/MAX794, the MAX795SCPA+ omits manual reset (MR), watchdog (WDI/WDO), low-line (LOWLINE), power-fail comparator (PFI/PFO), and BATT OK outputs - confirming its role as a streamlined, cost-optimized supervisory IC focused solely on reset generation and battery-backed supply routing for RAM retention.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.85V to 3.00V (S-suffix); ensures reliable reset assertion before 3.3V supply drops below system tolerance limit. |
| Battery Switch Threshold (VCC↓) | 2.41V typical; triggers switchover to backup battery before VCC breaches RAM retention voltage. |
| VCC Supply Current | 32µA to 45µA (TA = –40°C to +85°C); ultra-low quiescent current preserves battery life in standby. |
| CE IN-to-CE OUT Delay | ≤7ns max; prevents data corruption during undervoltage by synchronizing CE gating with reset state. |
| Operating Voltage Range | VCC = 2.72V to 5.5V, VBATT = –0.3V to +6.0V; supports 3.0V/3.3V systems and 3.6V lithium coin cells. |
| Reset Timeout Period | 200ms minimum; guarantees µP initialization completes before release from reset. |
| Package | 8-pin SO (SOIC) or DIP; industry-standard footprint compatible with automated assembly and legacy designs. |
Pinout & Package
MAX795SCPA+ is housed in an 8-pin SOIC (Small Outline Integrated Circuit) package, pin-compatible with the 8-pin PDIP variant. The package provides surface-mount reliability and thermal performance suitable for industrial temperature range operation (–40°C to +85°C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUT) | Supply Output | Switched output connected to VCC or BATT; powers CMOS RAM during normal/battery-backup modes. |
| 2 (VCC) | Main Supply Input | Primary 3.0V/3.3V system rail; monitored for reset assertion and used as reference for internal comparators. |
| 3 (GND) | Ground Reference | Common return path for all analog and digital functions; critical for accurate voltage monitoring. |
| 4 (PFI) | Power-Fail Comparator Input | Unused in MAX795; must be tied to VCC per datasheet to disable PFI functionality. |
| 5 (BATT ON) | Battery Status Indicator | Open-drain logic output high when OUT is sourced from BATT; drives external PMOS gate for >75mA loads. |
| 6 (BATT) | Backup Battery Input | Accepts 3.6V lithium cell; voltage may exceed VCC without damage due to internal isolation. |
| 7 (RESET) | Active-Low Reset Output | Open-drain output asserted low during undervoltage; requires external pull-up to VCC for µP interface. |
| 8 (CE IN) | Chip-Enable Input | Controls CE gating path; disables CE OUT during reset to prevent RAM write errors under low VCC. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed Reset Threshold (S-suffix) | 2.85V–3.00V window optimized for 3.3V ±10% supplies; eliminates external resistor divider complexity. |
| Battery Switchover with Hysteresis | 2.41V (falling) / 2.68V (rising) thresholds prevent chattering during VCC recovery; supports 3.6V Li batteries. |
| Guaranteed Reset to VCC = 1V | Ensures µP remains held in reset even during deep brownout, preventing erratic execution below safe voltage. |
| CE Signal Gating (≤7ns delay) | Prevents spurious writes to CMOS RAM during power transitions; meets timing requirements of fast µPs. |
| Low Quiescent Current (32–45µA) | Minimizes battery drain in always-on backup mode; extends shelf life of battery-backed systems. |
Applications
| Industrial Data Logger | Medical Patient Monitor |
|---|---|
Use Scenario: Long-term field deployment with intermittent mains power and lithium coin-cell backup. IC Role / Device Role / Timing Role: Supervisory IC asserting reset and switching RAM supply from VCC to BATT during AC loss. Use Value: Prevents RAM data corruption and ensures deterministic µP restart after power restoration. | Use Scenario: Portable diagnostic device requiring continuous memory retention during battery swaps. IC Role / Device Role / Timing Role: Backup-power manager enabling hot-swap of primary battery without losing patient history. Use Value: Maintains volatile RAM contents via seamless BATT switchover, eliminating need for EEPROM writes. |
| Smart Meter Communication Module | Ruggedized Handheld Terminal |
Use Scenario: AMI endpoint operating in unregulated grid environments with frequent voltage sags. IC Role / Device Role / Timing Role: Precision voltage monitor triggering reset before µP enters undefined state during brownout. Use Value: Enforces clean restart and avoids firmware lockup caused by marginal VCC operation. | Use Scenario: Field service tool exposed to wide temperature swings and mechanical shock. IC Role / Device Role / Timing Role: Low-power supervisor ensuring RAM integrity across –40°C to +85°C operating range. Use Value: Delivers guaranteed 200ms reset timeout and sub-7ns CE gating even at temperature extremes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX795TCPA+ | Higher reset threshold (3.00V–3.15V T-suffix); tighter tolerance for 3.3V ±5% systems. | Suitable for noise-immune applications where earlier reset assertion is undesirable. | Select MAX795TCPA+ when system VCC regulation is tighter and brownout margin is larger. |
| MAX795RCPA+ | Lower reset threshold (2.55V–2.70V R-suffix); optimized for 3.0V ±10% supplies. | Preferred for legacy 3.0V designs or battery-powered systems with wider voltage droop. | Choose MAX795RCPA+ when interfacing with 3.0V rails or maximizing battery runtime before reset. |
Compared with MAX795TCPA+ and MAX795RCPA+, the MAX795SCPA+ offers the optimal balance for mainstream 3.3V systems with ±10% tolerance - asserting reset early enough to prevent µP malfunction but late enough to avoid nuisance resets during transient sags.
Availability
MAX795SCPA+ is available at Aetrix Electronics and suitable for industrial data loggers, medical patient monitors, smart meter communication modules, and ruggedized handheld terminals requiring stable component supply across extended temperature ranges and long production lifecycles.
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, automotive, and communications markets.
The MAX795SCPA+ belongs to Maxim's microprocessor supervisory product line, engineered specifically to ensure reliable power-up, brownout protection, and battery-backed RAM retention in space-constrained 3.0V/3.3V embedded systems.
FAQ
What is the reset threshold voltage range for MAX795SCPA+?
The MAX795SCPA+ has a fixed reset threshold range of 2.85V to 3.00V (S-suffix), specified over temperature and supply variations. This range is optimized for 3.3V systems with ±10% tolerance, guaranteeing reset assertion before VCC falls below 2.85V and preventing premature reset above 3.00V. The MAX795SCPA+ does not support adjustable reset thresholds - unlike the MAX794 - and requires no external resistors.
Does MAX795SCPA+ include a watchdog timer?
No, the MAX795SCPA+ does not include a watchdog timer or associated pins (WDI, WDO). This distinguishes it from the MAX793 and MAX794 families, which integrate a 1.6s watchdog function. The MAX795SCPA+ is a simplified supervisory IC focused exclusively on reset generation, battery switchover, and CE gating - making it ideal for cost-sensitive or space-constrained applications where watchdog functionality is handled externally or omitted.
How does the battery switchover work on MAX795SCPA+?
The MAX795SCPA+ uses an internal p-channel MOSFET to switch the OUT pin between VCC and BATT. When VCC falls below 2.41V (typical, VCC falling), OUT disconnects from VCC and connects to BATT. When VCC rises above 2.68V (typical, VCC rising), OUT reconnects to VCC. This hysteresis prevents oscillation. VBATT may exceed VCC (e.g., 3.6V lithium), and the MAX795SCPA+ guarantees safe operation up to +6.0V on the BATT pin.
What is the purpose of the BATT ON pin on MAX795SCPA+?
The BATT ON pin on MAX795SCPA+ is an open-drain output that goes high when the internal switch connects OUT to BATT. It serves as a status indicator and can drive the gate of an external PMOS transistor to handle load currents exceeding the MAX795SCPA+'s 75mA internal switch rating. In normal operation (VCC active), BATT ON remains low. Its logic level directly reflects the source of the OUT supply - simplifying system-level power-state monitoring.
Can MAX795SCPA+ be used in place of MAX793 or MAX794?
The MAX795SCPA+ is not a drop-in replacement for MAX793 or MAX794 due to significant functional differences: it lacks MR, WDI, WDO, LOWLINE, PFI, PFO, and BATT OK pins. While pin-compatible in the 8-pin package, unused pins (e.g., PFI) must be tied to VCC per datasheet. Use MAX795SCPA+ only when the design requires only reset, battery switchover, and CE gating - not full-featured supervision. For feature parity, select MAX793 or MAX794 instead.
MAX795SCPA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- *
- Package/Case:
- -
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- -
- Number of Voltages Monitored:
- -
- Voltage - Threshold:
- -
- Output:
- -
- Reset:
- -
- Reset Timeout:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
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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