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Analog Devices Inc./Maxim Integrated MAX795RESA+T
- Part No.:
- MAX795RESA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX795RESA+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,795
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Product details
Overview
MAX795RESA+T from Maxim Integrated is an 8-pin SO microprocessor supervisory circuit for 3.0V systems, providing precision reset assertion at 2.55V–2.70V, backup-battery switchover (VBATT > VCC supported), and chip-enable signal gating with ≤7ns propagation delay. It monitors critical µP power rails in portable controllers and embedded systems requiring reliable brownout protection and RAM write protection.
For engineers reviewing the MAX795RESA+T datasheet, MAX795RESA+T pinout, MAX795RESA+T application, or MAX795RESA+T equivalent, key selection criteria include its fixed 2.55V–2.70V reset threshold, guaranteed reset assertion down to VCC = 1V, battery-switching capability with VBATT up to 6.0V, and integrated CE gating for CMOS RAM protection during undervoltage events.
Technical Context
The MAX795RESA+T implements a precision voltage comparator with 10mV typical hysteresis to prevent oscillation during VCC transitions near the reset threshold (2.55V–2.70V). Its internal p-channel MOSFET switch enables seamless switchover from VCC to backup battery when VCC falls below the battery switch threshold (2.52V typ.), with 15mV hysteresis to avoid chatter.
Unlike the MAX793/MAX794, the MAX795RESA+T omits watchdog timer, manual reset input (MR), battery OK output, and low-line warning - confirmed by pin count (8-pin vs. 16-pin) and feature selector guide. It retains only core functions: active-low reset, backup-battery switchover, CE IN/CE OUT gating, and PFO/PFI power-fail monitoring.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.55V–2.70V (VCC falling); ensures reset before 3.0V supply drops below 15% tolerance limit |
| Battery Switch Threshold | 2.52V (VCC falling); triggers switchover to backup battery before reset asserts |
| Supply Voltage Range | VCC = 2.72V to 5.5V; supports 3.0V nominal systems with wide operating margin |
| CE Propagation Delay | ≤7ns max; preserves timing integrity for high-speed µP address/data bus gating |
| Reset Timeout Period | 200ms min; guarantees sufficient µP initialization time after power recovery |
| Backup-Battery Voltage | VBATT = −0.3V to +6.0V; permits use of 3.6V lithium cells even with 3.0V VCC |
| Operating Temperature | −40°C to +85°C (E-grade); qualified for industrial embedded environments |
Pinout & Package
MAX795RESA+T is housed in an 8-pin SO (Small Outline) package, 150 mil width, RoHS-compliant lead-free (+T suffix), with standard JEDEC MS-012AC footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 OUT | Supply Output | Switched output connected to VCC or BATT; powers CMOS RAM during normal/battery modes |
| 2 VCC | Main Supply Input | Primary 3.0V system rail input; monitored for reset and battery switchover decisions |
| 3 GND | Ground Reference | Common return path for all analog comparators, digital logic, and output drivers |
| 4 PFI | Power-Fail Input | Monitors external voltage for early power-fail warning; drives PFO low when threshold crossed |
| 5 BATT ON | Battery Status Output | Active-high open-drain signal indicating OUT is sourced from BATT (not VCC) |
| 6 PFO | Power-Fail Output | Open-drain output asserting low on PFI under-voltage or VCC < VSW; used for NMI or freshness seal |
| 7 CE IN | Chip-Enable Input | Input to CE gating circuit; disables CE OUT during reset to prevent RAM corruption |
| 8 CE OUT | Chip-Enable Output | Gated CE signal passed to RAM; disabled during reset with ≤10µs hold time if CE IN was low |
Key Features
| Feature | Design Value |
|---|---|
| Fixed Reset Threshold | 2.55V–2.70V range optimized for 3.0V ±10% supplies; eliminates external resistor divider complexity |
| Battery Switchover | VBATT may exceed VCC (up to 6.0V); enables use of 3.6V lithium coin cells without level-shifting |
| CE Signal Gating | 7ns max propagation delay and automatic disable during reset; prevents spurious writes to CMOS RAM |
| Guaranteed Reset to 1V | RESET remains asserted down to VCC = 1V (no battery) or VCC = 0V (with battery); ensures robust brownout coverage |
| Low Quiescent Current | 35µA typical VCC supply current at 3.3V; extends battery life in always-on monitoring applications |
Applications
| Portable Medical Monitors | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Battery-backed data logger in handheld ECG device that must retain RAM state during main power interruption. IC Role / Device Role / Timing Role: Supervisory IC providing seamless VCC-to-battery switchover and CE gating to lock RAM access during transition. Use Value: Prevents data corruption during 200ms reset timeout while enabling instant resumption of logging after power recovery. | Use Scenario: Remote sensor node in factory automation system powered by 3.0V rail with backup supercapacitor. IC Role / Device Role / Timing Role: Precision voltage monitor asserting reset before 3.0V supply drops below 2.55V, protecting firmware execution. Use Value: Eliminates undervoltage-induced program crashes by guaranteeing reset assertion across full −40°C to +85°C range. |
| Smart Meter Data Storage | Ruggedized Handheld Terminals |
Use Scenario: Electricity meter storing tariff data in nonvolatile RAM during grid brownouts lasting seconds. IC Role / Device Role / Timing Role: Dual-role supervisor: PFO triggers NMI for early warning at VCC = 2.635V; RESET asserts fully at 2.55V. Use Value: Enables firmware to save critical registers before full reset, reducing data loss risk during marginal supply conditions. | Use Scenario: Field service terminal using 3.0V Li-ion battery with cold-temperature operation down to −40°C. IC Role / Device Role / Timing Role: Low-leakage (1µA battery leakage) supervisor maintaining RAM retention while minimizing self-discharge. Use Value: Extends shelf life of sealed units by limiting battery drain to <1µA during storage, per datasheet Note 3. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX795TESA+T | Reset threshold 3.00V–3.15V; higher trip point for 3.3V systems | Suitable for 3.3V ±5% supplies where tighter reset window is required | Select when system VCC nominal is 3.3V and brownout must occur above 3.0V |
| MAX795SESA+T | Reset threshold 2.85V–3.00V; mid-range trip for 3.0V/3.3V hybrid designs | Used where supply tolerance spans both 3.0V and 3.3V rails | Choose for flexible 3.0V/3.3V compatibility without redesigning reset network |
Compared with MAX795RESA+T, the MAX795TESA+T raises reset initiation to 3.00V-better for 3.3V systems needing earlier intervention-while MAX795SESA+T offers 2.85V–3.00V coverage ideal for mixed-rail designs; all share identical 8-pin SO package, CE gating, and battery switchover architecture.
Availability
MAX795RESA+T is available at Aetrix Electronics and suitable for portable medical monitors, industrial PLC I/O modules, smart meter data storage, and ruggedized handheld terminals requiring stable component supply across extended temperature ranges.
Supply support for MAX795RESA+T 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 industrial, automotive, and computing applications.
The MAX795 family delivers compact, low-power supervisory solutions specifically engineered for 3.0V/3.3V microprocessor systems requiring deterministic reset, battery backup, and memory protection-without watchdog or manual reset overhead.
FAQ
What is the exact reset threshold voltage range for MAX795RESA+T?
The MAX795RESA+T has a fixed reset threshold range of 2.55V to 2.70V for VCC falling, as specified in the Electrical Characteristics table (VRST parameter). This range is factory-trimmed and does not require external resistors. The threshold exhibits 10mV typical hysteresis to prevent chatter during slow VCC transitions, and reset remains asserted down to VCC = 1V in non-battery mode. This makes MAX795RESA+T suitable for 3.0V ±10% systems where brownout must be detected before supply drops below 2.55V.
Does MAX795RESA+T support backup-battery switchover with VBATT higher than VCC?
Yes, MAX795RESA+T explicitly supports VBATT exceeding VCC, up to +6.0V absolute maximum, as confirmed in Absolute Maximum Ratings and General Description. The internal p-channel MOSFET switch automatically connects OUT to BATT when VCC falls below the battery switch threshold (2.52V typ.), and reconnects to VCC when VCC rises above the reset threshold (2.55V min). This allows direct use of 3.6V lithium batteries in 3.0V systems without external level-shifting circuitry-verified in Typical Operating Characteristics (TOC1–TOC2) and Pin Description.
What are the key differences between MAX795RESA+T and MAX793/MAX794 variants?
MAX795RESA+T is an 8-pin derivative omitting features present in 16-pin MAX793/MAX794: no watchdog timer (WDO/WDI), no manual reset input (MR), no battery OK output (BATT OK), and no low-line warning (LOWLINE). Its pinout excludes MR, WDI, WDO, LOWLINE, RESET IN, and BATT OK pins. Functionally, it retains only reset generation, battery switchover, CE gating, and PFO/PFI-confirmed by Selector Guide, Pin Configurations, and Applications section listing "Critical µP Power Monitoring" without watchdog or manual reset references.
How does the CE IN-to-CE OUT gating function in MAX795RESA+T during power-down?
In MAX795RESA+T, the CE transmission gate disables automatically when reset is asserted (e.g., during VCC fall below 2.55V). If CE IN is low at reset assertion, CE OUT remains low for ≤10µs to complete the current RAM write cycle before going high-impedance. Propagation delay is ≤7ns in enabled mode, tested with 50Ω driver and 50pF load. This behavior prevents spurious writes during undervoltage, and is validated in Detailed Description section "Chip-Enable Signal Gating" and Figure 8 timing diagram-specific to MAX795's 8-pin implementation.
Is MAX795RESA+T compatible with industrial temperature requirements?
Yes, MAX795RESA+T is rated for −40°C to +85°C operation (E-grade), as stated in Ordering Information and Absolute Maximum Ratings. Its electrical characteristics-including reset threshold, battery switch threshold, supply current, and propagation delay-are guaranteed across this full range, with supporting Typical Operating Characteristics plots (TOC3–TOC7) showing performance stability from −40°C to +100°C. This qualifies MAX795RESA+T for deployment in industrial PLCs, smart meters, and outdoor handheld equipment without derating.
MAX795RESA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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+T FAQ
1.How can I place an order for MAX795RESA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX795RESA+T 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+T reliable?
The price and inventory of MAX795RESA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX795RESA+T is usually 5 days.
3.What payment methods are accepted for MAX795RESA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX795RESA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX795RESA+T?
MAX795RESA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX795RESA+T 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+T?
For technical support, including MAX795RESA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX795RESA+T requirements.
6.How does Aetrix verify that MAX795RESA+T is sourced from the original manufacturer or authorized distributors?
All MAX795RESA+T 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+T meets industry standards.
7.What is the process for return or replacement of MAX795RESA+T?
All MAX795RESA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX795RESA+T, 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+T part is unused and in its original packaging.
Return procedure for MAX795RESA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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