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Analog Devices Inc./Maxim Integrated MAX795SCSA+
- Part No.:
- MAX795SCSA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX795SCSA+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,539
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Product details
Overview
MAX795SCSA+ from Maxim Integrated is an 8-pin SO microprocessor supervisory circuit designed for 3.0V/3.3V systems, providing precision reset supervision (2.85V–3.00V threshold), backup-battery switchover (VBATT > VCC supported), and chip-enable gating with ≤7ns propagation delay. It monitors critical power conditions in battery-backed embedded controllers and portable equipment.
For engineers reviewing the MAX795SCSA+ datasheet, MAX795SCSA+ pinout, MAX795SCSA+ application, or MAX795SCSA+ equivalent, this page delivers verified specifications, validated pin functions, confirmed use cases in low-voltage µP systems, and two technically documented alternative parts with explicit functional and application-level differences.
Technical Context
The MAX795SCSA+ implements a fixed-threshold reset comparator with 2.85V to 3.00V trip range (S-suffix), guaranteed 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 real-time chip-enable signal control during undervoltage events.
Unlike the MAX794, it lacks adjustable reset threshold and watchdog functionality; unlike the MAX793, it omits BATT OK output and battery freshness seal. Its 8-pin SO package supports compact placement in space-constrained portable and embedded designs requiring reliable power monitoring without external timing components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.85V to 3.00V (VCC falling); ensures reset assertion before 3.3V supply drops below system tolerance limit (3.3V − 10% = 2.97V). |
| Battery Switch Threshold | 2.41V (typical, VCC falling); triggers switchover to backup battery before reset activation, preserving RAM data integrity. |
| VCC Supply Current | 32µA to 45µA (TA = −40°C to +85°C); enables ultra-low-power operation in always-on battery-backed systems. |
| CE Propagation Delay | ≤7ns (max); allows safe gating of high-speed chip-enable signals without disrupting µP memory access timing. |
| Reset Timeout Period | 200ms (guaranteed); provides sufficient hold time to ensure full µP initialization after power recovery. |
| Operating Voltage Range | VCC = 2.72V to 5.5V; supports dual-supply flexibility while maintaining supervision integrity across 3.0V/3.3V rails. |
| Package | 8-pin SO (Small Outline); 3.9mm × 4.9mm footprint compatible with automated SMT assembly and IPC-7351B land patterns. |
Pinout & Package
MAX795SCSA+ is housed in an 8-pin SO (Small Outline) package with gull-wing leads, JEDEC MS-012AC compliant, 1.27mm pitch, and moisture sensitivity level (MSL) 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 OUT | Supply Output | Switched output connected to VCC or BATT via internal p-MOSFET; powers CMOS RAM during main or backup operation. |
| 2 VCC | Main Supply Input | Primary 3.0V/3.3V power rail input; reset and supervision logic reference; must be ≥2.72V for guaranteed operation. |
| 3 GND | Ground Reference | Common return path for all analog and digital circuitry; requires low-impedance PCB connection to minimize noise coupling. |
| 4 PFI | Power-Fail Comparator Input | Monitors external voltage (e.g., +5V rail); asserts PFO low when input falls below 1.212V, enabling early power-fail warning. |
| 5 BATT ON | Battery-On Indicator | Open-drain logic-high output when OUT is sourced from BATT; drives external PMOS/NPN switch for >75mA load support. |
| 6 RESET | Active-Low Reset Output | Open-drain output requiring external pullup; guarantees low state for 200ms on power-up, brownout, or MR assertion. |
| 7 PFO | Power-Fail Comparator Output | Active-low open-drain output; goes low on PFI < 1.212V or VCC < 2.41V; used for NMI generation or battery seal enable. |
| 8 BATT | Backup Battery Input | Accepts 3.6V lithium cell; voltage may exceed VCC; internal leakage <1µA ensures multi-year battery shelf life. |
Key Features
| Feature | Design Value |
|---|---|
| Precision Fixed Reset Threshold | 2.85V–3.00V range (S-suffix) with ±15mV hysteresis; eliminates need for external resistor divider while ensuring robust brownout immunity. |
| Backup-Battery Switchover | VBATT > VCC supported (e.g., 3.6V Li battery with 3.3V VCC); automatic seamless transition preserves RAM contents during main supply loss. |
| Chip-Enable Gating | 7ns max CE IN-to-CE OUT propagation delay; prevents erroneous writes to CMOS RAM during undervoltage by disabling CE path on reset assertion. |
| Guaranteed Reset Below 1V VCC | RESET remains asserted down to VCC = 1V (with VBATT > 1V); ensures µP stays held in reset even during deep brownout or rapid power collapse. |
| Low-Power Supervision | 32–45µA typical VCC supply current over full temperature range; reduces standby power burden in battery-critical applications. |
Applications
| Industrial Data Logger | Medical Portable Monitor |
|---|---|
Use Scenario: Long-term field deployment with intermittent mains power and primary reliance on coin-cell backup. IC Role / Device Role / Timing Role: Supervises 3.3V µP power rail, gates CE to protect flash memory during brownout, and switches RAM supply to 3.6V Li battery upon VCC drop below 2.41V. Use Value: Prevents data corruption during grid instability; extends usable battery life via <45µA quiescent current; eliminates need for external reset IC or discrete switchover circuitry. |
Use Scenario: Battery-powered vital-signs monitor requiring continuous RAM retention and deterministic reset behavior during charging cycles. IC Role / Device Role / Timing Role: Monitors 3.0V system rail, asserts 200ms reset pulse on power-up and brownout, and enables CE gating to block spurious writes during low-VCC transitions. Use Value: Ensures FDA-compliant deterministic boot sequence; maintains patient data integrity across charge/discharge cycles; supports compact 8-pin SO layout in handheld enclosure. |
| Smart Meter Communication Module | Ruggedized Handheld Terminal |
Use Scenario: Sub-metering node operating in wide-temperature industrial environments with frequent power interruptions. IC Role / Device Role / Timing Role: Provides temperature-stable reset threshold (±15mV over −40°C to +85°C), detects early power-fail via PFI input, and asserts PFO to trigger secure shutdown before VCC collapse. Use Value: Guarantees valid reset assertion across full industrial temp range; enables predictive power-loss response via PFI/PFO interface; reduces BOM count by integrating switchover and CE control. |
Use Scenario: Field-deployed terminal exposed to thermal cycling and mechanical shock, requiring fail-safe µP restart on supply recovery. IC Role / Device Role / Timing Role: Delivers 200ms reset timeout with guaranteed low-state hold, monitors VCC with 2.85V threshold aligned to 3.3V ±10% spec, and isolates CE path during undervoltage transients. Use Value: Eliminates boot failures due to marginal VCC recovery; prevents corrupted configuration writes during battery swap; simplifies layout with single 8-pin SO footprint. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX793SCSA+ | 16-pin SO package; includes BATT OK output, battery freshness seal, and independent watchdog timer (1.6s). | Required where battery status monitoring or watchdog fault detection is needed; unsuitable for space-constrained 8-pin layouts. | Select MAX793SCSA+ only if BATT OK indication or watchdog supervision is mandatory; otherwise MAX795SCSA+ reduces footprint and cost. |
| TPS3808G18DBVR | Single-channel 1.8V supervisor (not 3.0V/3.3V); fixed 1.8V reset threshold; no battery switchover or CE gating. | Applicable only for 1.8V core logic supervision; cannot replace MAX795SCSA+ in 3.3V RAM backup or CE-controlled systems. | TPS3808G18DBVR is not functionally comparable; use only in 1.8V-only designs without backup power requirements. |
Compared with MAX793SCSA+, MAX795SCSA+ saves board area and cost by omitting redundant features (watchdog, BATT OK), while retaining identical reset accuracy and battery switchover capability; TPS3808G18DBVR lacks both voltage range compatibility and critical backup-power functions required for this application.
Availability
MAX795SCSA+ is available at Aetrix Electronics and suitable for industrial data loggers, medical portable monitors, smart meter communication modules, and ruggedized handheld terminals requiring stable component supply with guaranteed long-term availability.
Supply support for MAX795SCSA+ 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 MAX793/MAX794/MAX795 product line was engineered specifically for reliable power supervision in 3.0V/3.3V microprocessor systems with battery backup, emphasizing precision reset thresholds, low-quiescent-current operation, and integrated CE signal protection.
FAQ
What is the exact reset threshold voltage range for MAX795SCSA+?
The MAX795SCSA+ has a fixed reset threshold range of 2.85V to 3.00V (VCC falling), corresponding to the 'S' suffix per Maxim's Selector Guide. This range is optimized for 3.3V ±10% power supplies and is factory-trimmed - no external resistors are required. The threshold exhibits ±15mV typical hysteresis to prevent chatter during slow VCC transitions, and the device guarantees reset assertion before VCC falls below 2.85V across −40°C to +85°C.
Does MAX795SCSA+ support backup-battery switchover with VBATT > VCC?
Yes, MAX795SCSA+ fully supports VBATT > VCC operation - specifically designed for 3.6V lithium batteries in 3.0V/3.3V systems. When VCC falls below the battery switch threshold (2.41V typical), the internal p-channel MOSFET seamlessly connects BATT to the OUT pin, powering downstream CMOS RAM. Leakage into the battery is limited to <1µA, preserving shelf life. This behavior is explicitly confirmed in the Absolute Maximum Ratings and Electrical Characteristics tables for MAX795SCSA+.
What is the function of the BATT ON pin on MAX795SCSA+?
The BATT ON pin on MAX795SCSA+ is an open-drain, active-high indicator that asserts logic high only when the OUT pin is sourced from the BATT input (i.e., during battery-backup mode). It is not a power switch driver but a status signal - intended to drive the gate/base of an external PMOS or NPN transistor to handle loads exceeding the 75mA internal switch limit. Its VOL is specified at 0.2×VBATT with 200µA sink, confirming direct compatibility with standard level-shifting interfaces.
Can MAX795SCSA+ be used without a backup battery?
Yes, MAX795SCSA+ operates correctly with no battery connected. Per the Pin Description and Typical Operating Circuit, BATT can be tied directly to VCC and OUT if backup functionality is unused. In this configuration, the internal switchover circuit remains inactive, and all supervision functions - including reset assertion, PFI monitoring, and CE gating - operate normally from VCC alone. The device draws only 32–45µA, making it suitable for non-battery applications where robust 3.3V supervision is required.
How does the CE IN-to-CE OUT gating work on MAX795SCSA+ during reset?
During reset assertion, MAX795SCSA+ disables the CE transmission gate: CE IN becomes high-impedance, and CE OUT is forced low for 10µs (if CE IN was low at reset onset) to complete any ongoing memory write cycle. Thereafter, CE OUT remains low until reset deasserts. This prevents spurious chip-select pulses from corrupting CMOS RAM during undervoltage. The ≤7ns propagation delay in normal mode ensures compatibility with high-speed µPs, and the 46Ω series resistance in enabled mode minimizes signal distortion.
MAX795SCSA+ 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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX795SCSA+ FAQ
1.How can I place an order for MAX795SCSA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX795SCSA+ 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 MAX795SCSA+ reliable?
The price and inventory of MAX795SCSA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX795SCSA+ is usually 5 days.
3.What payment methods are accepted for MAX795SCSA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX795SCSA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX795SCSA+?
MAX795SCSA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX795SCSA+ 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 MAX795SCSA+?
For technical support, including MAX795SCSA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX795SCSA+ requirements.
6.How does Aetrix verify that MAX795SCSA+ is sourced from the original manufacturer or authorized distributors?
All MAX795SCSA+ 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 MAX795SCSA+ meets industry standards.
7.What is the process for return or replacement of MAX795SCSA+?
All MAX795SCSA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX795SCSA+, 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 MAX795SCSA+ part is unused and in its original packaging.
Return procedure for MAX795SCSA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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