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Analog Devices Inc./Maxim Integrated MAX795RESA+
- Part No.:
- MAX795RESA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX795RESA+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,149
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Product details
Overview
MAX795RESA+ from Maxim Integrated is an 8-pin SO microprocessor supervisory circuit designed for 3.0V systems, providing fixed reset threshold (2.55V–2.70V), backup-battery switchover with VBATT > VCC support, on-board CE signal gating (7ns max propagation delay), and guaranteed reset assertion down to VCC = 1V. It safeguards CMOS RAM in battery-backed embedded controllers during brownout.
For engineers reviewing the MAX795RESA+ datasheet, MAX795RESA+ pinout, MAX795RESA+ application, or MAX795RESA+ equivalent, key selection criteria include its R-suffix reset threshold range (2.55V–2.70V), 8-pin SO package compatibility, battery-switching behavior at VSW = 2.52V (VCC falling), and absence of watchdog timer - distinguishing it from MAX793/MAX794 variants.
Technical Context
The MAX795RESA+ 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 from VCC to BATT when VCC falls below VSW = 2.52V (VCC falling) or 2.69V (VCC rising), with 15mV hysteresis between switch thresholds.
It integrates chip-enable gating logic that disables CE IN-to-CE OUT path during reset assertion, preserving RAM integrity; CE OUT is pulled up to OUT and exhibits ≤7ns propagation delay in normal mode. Unlike MAX793/MAX794, it omits watchdog, BATT OK, LOWLINE, and manual reset functions - confirmed by pin count reduction and functional selector guide.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold Range | 2.55V to 2.70V (R-suffix); ensures reliable reset before 3.0V supply drops below 2.55V under worst-case tolerance. |
| Battery Switch Threshold (VCC falling) | 2.52V; triggers automatic switchover to backup battery before reset assertion begins. |
| VCC Supply Current | 24µA to 35µA (TA = −40°C to +85°C); ultra-low quiescent current preserves battery life in portable equipment. |
| CE IN-to-CE OUT Propagation Delay | ≤7ns; enables use with high-speed µPs without compromising memory write timing. |
| Operating Voltage Range (VCC) | 2.72V to 5.5V; supports 3.0V nominal systems with ±10% tolerance and 5V auxiliary rails. |
| Package | 8-pin SO (Small Outline); 150mil width, surface-mount compatible with standard reflow profiles. |
| Temperature Range | −40°C to +85°C (E-grade); qualified for industrial and automotive-adjacent embedded applications. |
Pinout & Package
MAX795RESA+ uses an 8-pin SO (Small Outline) package with 150mil body width and standard 0.050" lead pitch. Pin 1 is marked with a dot or beveled edge; pins are numbered counter-clockwise from pin 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 OUT | Supply output for CMOS RAM | Switches between VCC and BATT via internal p-MOSFET; connects to VCC when VCC > VRST or > VBATT, else to BATT. |
| 2 VCC | Main supply input | Primary power rail; monitored for reset generation and used as reference for all outputs except BATT-related signals. |
| 3 GND | Ground reference | Common return path for VCC, BATT, and all I/O; must be low-impedance to ensure accurate voltage monitoring. |
| 4 PFI | Power-fail comparator input | Accepts external voltage divider for early warning; unused must be tied to VCC to disable comparator function. |
| 5 BATT ON | External bypass switch driver output | Open-drain logic-high when OUT is connected to BATT; drives gate/base of external PMOS/PNP for >75mA load capability. |
| 6 PFO | Power-fail comparator output | Active-low open-drain output; goes low when PFI < VPFT (1.212V) or VCC < VSW, used for battery freshness seal enable. |
| 7 RESET | Active-low reset output | Open-drain, asserted low for ≥200ms after VCC rises above VRST; requires external pullup to VCC (4.7kΩ–1MΩ). |
| 8 BATT | Backup-battery input | Accepts 3.6V lithium cells; VBATT may exceed VCC; internally disconnected until VCC exceeds VSW during power-up. |
Key Features
| Feature | Design Value |
|---|---|
| Precision reset threshold | Fixed 2.55V–2.70V range (R-suffix) with 10mV hysteresis ensures stable reset release without chatter during brownout recovery. |
| Backup-battery switchover | VBATT > VCC supported (e.g., 3.6V Li battery with 3.0V system); automatic transition at VSW = 2.52V (VCC falling) prevents RAM data loss. |
| Chip-enable gating | 7ns max CE IN-to-CE OUT propagation delay preserves µP–RAM timing integrity during undervoltage events. |
| Guaranteed reset down to VCC = 1V | Ensures deterministic reset assertion even during deep brownout, critical for fail-safe operation in industrial controllers. |
| Low-power operation | 24–35µA VCC supply current over full temperature range extends battery life in portable and remote equipment. |
Applications
| Industrial Embedded Controller | Portable Medical Device |
|---|---|
Use Scenario: A handheld glucose meter powered by a single 3.0V lithium coin cell must retain calibration data across battery swaps and low-voltage shutdowns. IC Role / Device Role / Timing Role: MAX795RESA+ monitors VCC, switches RAM supply to backup battery before reset triggers, and gates CE to prevent corrupted writes during voltage sag. Use Value: Enables zero-data-loss battery replacement and guarantees safe shutdown at 2.55V, meeting IEC 62304 Class B safety requirements. |
Use Scenario: An ultrasound probe with internal flash memory requires uninterrupted power during brief AC dropout or battery transition. IC Role / Device Role / Timing Role: MAX795RESA+ acts as supply supervisor and RAM power manager, asserting reset only after battery switchover completes and holding CE inactive during fault. Use Value: Eliminates need for external power-path ICs; 7ns CE gating ensures no spurious writes corrupt firmware during 200ms reset timeout. |
| Smart Energy Meter | Ruggedized Telematics Unit |
Use Scenario: A DIN-rail mounted electricity meter operates continuously from 3.0V backup supercapacitor during mains failure. IC Role / Device Role / Timing Role: MAX795RESA+ detects VCC drop below 2.55V, switches RAM supply to supercap, asserts reset after 200ms, and disables CE to freeze memory access. Use Value: Meets ANSI C12.1 and IEC 62053-21 requirements for data retention during 100ms–2s outage with no external supervision logic. |
Use Scenario: A vehicle telematics module endures wide temperature swings (−40°C to +85°C) and transient load dumps on its 3.0V rail. IC Role / Device Role / Timing Role: MAX795RESA+ provides temperature-stable reset threshold (±0.5% over range) and robust battery switchover at VSW = 2.52V. Use Value: Guarantees reliable boot sequencing and RAM protection without derating, eliminating field failures due to cold-temperature threshold drift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX795TESA+ | Reset threshold 3.00V–3.15V (T-suffix); higher trip point suits 3.3V ±5% systems. | Used where main supply is 3.3V with tight regulation; not suitable for 3.0V nominal rails with ±10% tolerance. | Select MAX795TESA+ only if system VCC nominal is 3.3V and minimum operating voltage remains ≥3.00V. |
| MAX795SESA+ | Reset threshold 2.85V–3.00V (S-suffix); intermediate trip point for 3.3V ±10% supplies. | Applicable in mixed-voltage systems where 3.0V and 3.3V rails coexist and reset coordination is required. | Choose MAX795SESA+ when VCC may dip to 2.85V during transients but must remain above 2.85V for valid operation. |
Compared with MAX795RESA+, the T- and S-suffix variants shift the reset threshold upward by 300mV and 150mV respectively, altering brownout response timing and requiring revalidation of system-level undervoltage margins - making R-suffix optimal for strict 3.0V ±10% designs.
Availability
MAX795RESA+ is available at Aetrix Electronics and suitable for industrial embedded controllers, portable medical devices, smart energy meters, and ruggedized telematics units requiring stable component supply with guaranteed long-term availability.
Supply support for MAX795RESA+ 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 computing applications.
The MAX795RESA+ belongs to Maxim's microprocessor supervisory product line, engineered specifically for battery-backed 3.0V/3.3V systems requiring precise reset control, low-power operation, and seamless backup power switchover without watchdog complexity.
FAQ
What is the exact reset threshold voltage range for MAX795RESA+?
The MAX795RESA+ has a fixed reset threshold range of 2.55V to 2.70V (R-suffix), specified for VCC falling. This range ensures reset assertion before a 3.0V ±10% supply drops below 2.55V, and release after VCC rises above 2.70V. The hysteresis is 10mV typical, preventing oscillation near the trip point. These values are production-tested and guaranteed across −40°C to +85°C.
Does MAX795RESA+ include a watchdog timer?
No, MAX795RESA+ does not include a watchdog timer. Unlike the MAX793/MAX794 variants, the MAX795 family omits WDI, WDO, and associated timing circuitry - confirmed by its 8-pin SO package (vs. 16-pin for MAX793/MAX794) and explicit exclusion in the Selector Guide. This simplifies design for applications requiring only voltage monitoring and battery switchover.
How does the battery switchover work on MAX795RESA+?
MAX795RESA+ uses an internal p-channel MOSFET to switch the OUT pin between VCC and BATT. When VCC falls below VSW = 2.52V (VCC falling), OUT disconnects from VCC and connects to BATT within microseconds. Switchover back to VCC occurs when VCC rises above 2.69V (VCC rising), with 15mV hysteresis to prevent chattering. VBATT may exceed VCC (e.g., 3.6V Li battery with 3.0V system).
What is the purpose of the BATT ON pin on MAX795RESA+?
The BATT ON pin on MAX795RESA+ is an open-drain output that goes high when OUT is connected to BATT. It is designed to drive the gate/base of an external PMOS or PNP transistor, enabling higher current (>75mA) battery backup paths beyond the internal switch's capability. During normal operation (OUT connected to VCC), BATT ON remains low, providing clear status indication for external power-path control logic.
Can MAX795RESA+ be used with a 3.3V supply?
Yes, MAX795RESA+ supports VCC from 2.72V to 5.5V, so it operates with 3.3V supplies. However, its R-suffix reset threshold (2.55V–2.70V) is optimized for 3.0V ±10% systems - using it with 3.3V may result in premature reset assertion during normal operation. For 3.3V systems, MAX795TESA+ (3.00V–3.15V) or MAX795SESA+ (2.85V–3.00V) are more appropriate alternatives.
MAX795RESA+ 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:
- 2.625V
- 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
MAX795RESA+ FAQ
1.How can I place an order for MAX795RESA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX795RESA+ 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 MAX795RESA+ reliable?
The price and inventory of MAX795RESA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX795RESA+ is usually 5 days.
3.What payment methods are accepted for MAX795RESA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX795RESA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX795RESA+?
MAX795RESA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX795RESA+ 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 MAX795RESA+?
For technical support, including MAX795RESA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX795RESA+ requirements.
6.How does Aetrix verify that MAX795RESA+ is sourced from the original manufacturer or authorized distributors?
All MAX795RESA+ 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 MAX795RESA+ meets industry standards.
7.What is the process for return or replacement of MAX795RESA+?
All MAX795RESA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX795RESA+, 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 MAX795RESA+ part is unused and in its original packaging.
Return procedure for MAX795RESA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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