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Analog Devices Inc./Maxim Integrated MAX795SESA+
- Part No.:
- MAX795SESA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX795SESA+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:106
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Product details
Overview
MAX795SESA+ from Maxim Integrated is an 8-pin SO microprocessor supervisory circuit designed for 3.0V/3.3V systems, providing precision reset assertion (2.85V–3.00V threshold), backup-battery switchover with VBATT > VCC support, and chip-enable signal gating with ≤7ns propagation delay. It monitors critical power conditions in portable controllers and embedded systems where reliable brownout recovery and RAM write protection are required.
For engineers reviewing the MAX795SESA+ datasheet, MAX795SESA+ pinout, MAX795SESA+ application, or MAX795SESA+ equivalent, key selection criteria include its fixed S-suffix reset threshold (2.85V–3.00V), guaranteed reset assertion down to VCC = 1V, battery-switching hysteresis, CE gating timing behavior, and compatibility with lithium backup batteries up to 3.6V.
Technical Context
The MAX795SESA+ implements a precision voltage 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 when VCC falls below VSW (2.69V typ) or rises above VRST, with 15mV hysteresis on the VCC-to-VBATT comparator.
Unlike the MAX793/MAX794, the MAX795SESA+ omits manual reset (MR), watchdog (WDI/WDO), battery freshness seal, and BATT OK output - confirming its role as a streamlined, cost-optimized supervisory IC focused solely on reset generation, low-line warning (LOWLINE), and CE gating for CMOS RAM protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.85V–3.00V (S-suffix); ensures reset asserts before 3.3V supply drops below system tolerance limit (3.3V −10%) |
| Battery Switch Threshold | 2.69V (typ); defines VCC falling point where OUT disconnects from VCC and connects to VBATT |
| CE IN-to-CE OUT Delay | ≤7ns max; guarantees minimal latency in disabling chip-enable during undervoltage, preserving RAM integrity |
| Guaranteed Reset Assertion | Down to VCC = 1V; maintains valid reset signal even during deep brownout or partial power loss |
| Supply Current (VCC = 3.3V) | 35µA (typ); ultra-low quiescent current extends battery life in always-on monitoring applications |
| Operating Voltage Range | VCC = 2.72V to 5.5V; supports both 3.0V and 3.3V nominal rails plus 5V legacy interfaces |
| Package | 8-pin SO (SOIC); industry-standard footprint enabling drop-in replacement and high-density PCB layout |
Pinout & Package
MAX795SESA+ is housed in an 8-pin narrow SO (SOIC) package with 1.27mm pitch, JEDEC MS-012AC compliant, and rated for 0°C to +70°C operation.
| 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 input; powers internal logic and determines reset threshold reference |
| 3 GND | Ground Reference | Common return path for all analog comparators, digital outputs, and internal switching elements |
| 4 PFI | Power-Fail Comparator Input | Monitors external voltage (e.g., +5V rail); triggers PFO low when input falls below 1.212V threshold |
| 5 BATT ON | Battery Status Indicator | Open-drain output high when OUT is sourced from BATT; drives external PMOS gate for >75mA loads |
| 6 PFO | Power-Fail Comparator Output | Active-low open-drain flag signaling imminent power failure or VCC < VSW condition |
| 7 LOWLINE | Early Warning Output | Active-low signal asserted when VCC falls to VLR (≈2.925V); used for NMI or preemptive shutdown |
| 8 RESET | Reset Output | Open-drain active-low reset pulse (200ms min); requires external pull-up to VCC for µP interface |
Key Features
| Feature | Design Value |
|---|---|
| Precision Reset Monitoring | Fixed 2.85V–3.00V threshold with ±15mV accuracy over temperature ensures deterministic reset timing in 3.3V ±10% systems |
| Backup-Battery Switchover | Supports VBATT up to 3.6V exceeding VCC; enables use of standard lithium coin cells without level-shifting circuitry |
| Chip-Enable Gating | 7ns max CE IN-to-CE OUT propagation delay prevents spurious writes to CMOS RAM during power transients |
| Low-Line Early Warning | LOWLINE output asserts ~75mV below reset threshold (VLR = VRST −75mV), providing 100–200ms advance notice before reset |
| Ultra-Low Power Operation | 35µA typical VCC supply current at 3.3V enables multi-year battery life in always-on portable equipment |
Applications
| Battery-Powered Portable Controllers | Embedded Industrial Data Loggers |
|---|---|
Use Scenario: Handheld diagnostic tool powered by single 3.3V Li-ion cell with optional coin-cell backup for RTC and SRAM retention during main battery swap. IC Role / Device Role / Timing Role: MAX795SESA+ generates precise reset when main supply dips below 2.85V and switches SRAM supply to backup battery before VCC collapses. Use Value: Prevents data corruption during hot-swap events and extends functional uptime via seamless power-source handoff. | Use Scenario: Remote environmental sensor node operating on 3.0V regulated rail with periodic wake-up; requires reliable brownout detection and RAM protection across wide temperature range. IC Role / Device Role / Timing Role: MAX795SESA+ asserts RESET and disables CE OUT within 7ns when VCC drops below 2.85V, halting MCU execution and freezing memory access. Use Value: Eliminates need for external reset supervisor or discrete MOSFET switch, reducing BOM count and board area. |
| Critical µP Power Monitoring | Intelligent Power Management Modules |
Use Scenario: Medical infusion pump with dual-rail power (3.3V MCU + 5V peripherals) requiring fail-safe reset initiation before supply collapse affects motor control. IC Role / Device Role / Timing Role: MAX795SESA+ monitors 3.3V rail and asserts RESET while simultaneously pulling LOWLINE to trigger NMI for graceful shutdown sequence. Use Value: Provides two independent voltage-fault signals (RESET + LOWLINE) with defined timing relationship (75mV offset), enabling layered fault response. | Use Scenario: Smart building controller managing multiple 3.3V subsystems; uses PFI input to monitor auxiliary 5V supply and coordinate controlled shutdown when primary fails. IC Role / Device Role / Timing Role: MAX795SESA+ uses PFI to detect 5V rail collapse and asserts PFO low, which disables downstream regulators and initiates safe state transition. Use Value: Enables centralized power-fail coordination across distributed modules using single supervisory IC instead of discrete comparators. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX793SESA+ | 16-pin SO package; includes MR input, watchdog timer, BATT OK output, and battery freshness seal - not present in MAX795SESA+ | Suitable for designs requiring manual reset initiation or battery health monitoring; adds complexity and pin count | Select MAX793SESA+ only if MR, WDI/WDO, or BATT OK functionality is required; otherwise MAX795SESA+ offers smaller footprint and lower cost |
| TPS3808G33DBVR | TI part with 3.3V fixed reset threshold (3.08V), 350ms reset timeout (vs. 200ms), no CE gating or LOWLINE output | Targeted at basic reset-only applications; lacks early-warning and memory-protection features of MAX795SESA+ | Choose TPS3808G33DBVR for simple reset supervision where CE gating and LOWLINE are unnecessary; MAX795SESA+ preferred when RAM protection and predictive warning are needed |
Compared with MAX793SESA+, MAX795SESA+ reduces pin count and feature set to optimize for space-constrained 3.3V systems needing only core reset, battery switchover, and CE gating - while TPS3808G33DBVR provides a lower-cost reset-only alternative without memory interface safeguards.
Availability
MAX795SESA+ is available at Aetrix Electronics and suitable for battery-powered portable controllers, embedded industrial data loggers, critical µP power monitoring, and intelligent power management modules requiring stable component supply and long-term lifecycle support.
Supply support for MAX795SESA+ 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 in industrial, automotive, and computing markets.
The MAX795SESA+ belongs to Maxim's microprocessor supervisory product line, engineered specifically for reliable power monitoring and memory protection in 3.0V/3.3V embedded systems with battery backup requirements.
FAQ
What is the exact reset threshold voltage range for MAX795SESA+?
The MAX795SESA+ has an S-suffix reset threshold of 2.85V to 3.00V (VCC falling), with typical trip point at 2.925V. This range is factory-trimmed and specified over temperature (0°C to +70°C). The threshold exhibits 10mV typical hysteresis to prevent chatter during slow VCC transitions, and reset remains asserted until VCC rises above 3.00V (VCC rising threshold).
Does MAX795SESA+ support backup batteries with voltage higher than VCC?
Yes, MAX795SESA+ supports VBATT up to 3.6V - exceeding typical 3.0V/3.3V VCC rails. Its internal p-channel MOSFET switch enables automatic switchover when VCC falls below the battery switch threshold (VSW = 2.69V typ). The device guarantees proper operation with VBATT > VCC, making it compatible with standard 3.6V lithium coin cells without external level-shifting circuitry.
What is the function of the LOWLINE output on MAX795SESA+?
The LOWLINE output on MAX795SESA+ is an active-low early warning signal that asserts when VCC falls to approximately 2.925V - about 75mV below the reset threshold. It provides 100–200ms advance notice before RESET activation, enabling the host µP to execute graceful shutdown, save state, or trigger NMI-based interrupt handling prior to full reset assertion.
Can MAX795SESA+ be used without a backup battery?
Yes, MAX795SESA+ operates fully without a backup battery. Connect BATT to VCC (or leave floating per datasheet guidance), and the device functions as a standard 3.3V supervisory IC with RESET, LOWLINE, PFO, and CE gating. The BATT ON and OUT pins will remain tied to VCC, and all voltage-monitoring features continue operating normally - only battery-switchover capability is disabled.
What is the maximum load current supported by the CE OUT pin of MAX795SESA+?
The CE OUT pin of MAX795SESA+ is a buffered CMOS output capable of driving ≥10mA sink/source current. Its VOH is 0.8VCC (min) at ISOURCE = 100µA, and VOL is 0.2VCC (max) at ISINK = 1.2mA. For heavy capacitive loads (>50pF) or high-speed toggling, minimize trace length and add series resistance to limit ringing - the 7ns propagation delay assumes 50Ω source and 50pF load per test conditions.
MAX795SESA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Battery Backup Circuit
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.925V
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX795SESA+ FAQ
1.How can I place an order for MAX795SESA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX795SESA+ 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 MAX795SESA+ reliable?
The price and inventory of MAX795SESA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX795SESA+ is usually 5 days.
3.What payment methods are accepted for MAX795SESA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX795SESA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX795SESA+?
MAX795SESA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX795SESA+ 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 MAX795SESA+?
For technical support, including MAX795SESA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX795SESA+ requirements.
6.How does Aetrix verify that MAX795SESA+ is sourced from the original manufacturer or authorized distributors?
All MAX795SESA+ 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 MAX795SESA+ meets industry standards.
7.What is the process for return or replacement of MAX795SESA+?
All MAX795SESA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX795SESA+, 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 MAX795SESA+ part is unused and in its original packaging.
Return procedure for MAX795SESA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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