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Analog Devices Inc./Maxim Integrated MAX795RCSA+
- Part No.:
- MAX795RCSA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX795RCSA+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,474
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Product details
Overview
MAX795RCSA+ from Maxim Integrated is an 8-pin microprocessor supervisory circuit designed for 3.0V systems, providing fixed reset threshold (2.55V–2.70V), backup-battery switchover with VBATT > VCC support, chip-enable gating (7ns max propagation delay), and guaranteed reset assertion down to VCC = 1V. It safeguards CMOS RAM in portable controllers during brownout and power-fail events.
For engineers reviewing the MAX795RCSA+ datasheet, MAX795RCSA+ pinout, MAX795RCSA+ application, or MAX795RCSA+ equivalent, key selection criteria include its R-suffix reset threshold range, 8-pin SO package compatibility, battery-switching hysteresis (15mV typical), and absence of watchdog or battery-OK features-distinguishing it from MAX793/MAX794 variants.
Technical Context
The MAX795RCSA+ implements a precision voltage comparator with fixed 2.55V–2.70V reset threshold (VCC falling), battery switchover triggered at VSW = 2.52V (falling) / 2.69V (rising), and on-resistance <160Ω (VCC-to-OUT) across –40°C to +85°C. Its CE IN-to-CE OUT transmission gate operates with 7ns max propagation delay and 46Ω series resistance in enabled mode.
Unlike MAX793/MAX794, MAX795RCSA+ omits manual reset input (MR), watchdog timer, battery-OK output, and low-line warning-reducing pin count to 8 while retaining core supply monitoring, backup switchover, and CE gating for space-constrained 3.0V embedded systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold Range | 2.55V to 2.70V (VCC falling); ensures reliable reset before 3.0V supply drops below 2.55V |
| Battery Switch Threshold | 2.52V (VCC falling), 2.69V (VCC rising); enables seamless VCC-to-BATT switchover with 15mV hysteresis |
| Supply Voltage Range | VCC = 2.72V to 5.5V, VBATT = –0.3V to +6.0V; supports 3.0V systems with 3.6V lithium backup |
| CE Propagation Delay | ≤7ns (50% point, 50Ω driver, 50pF load); prevents RAM corruption during undervoltage transitions |
| VCC Supply Current | 24µA (typ) at VCC = 3.3V, TA = +25°C; enables ultra-low-power operation in battery-backed systems |
| Operating Temperature | 0°C to +70°C; qualified for commercial-grade embedded controller environments |
| Package | 8-pin SO (small outline); 4.9mm × 6.0mm footprint compatible with high-density PCB layouts |
Pinout & Package
MAX795RCSA+ uses an 8-pin SO (small outline) package with exposed pad, optimized for thermal performance and board space efficiency in portable equipment.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 OUT | Supply output for CMOS RAM | Switches between VCC and BATT; connects to VCC when VCC > VRST or > VBATT, else to BATT |
| 2 VCC | Main supply input | Primary system power rail (2.72V–5.5V); powers internal logic and drives CE OUT pullup |
| 3 GND | Ground reference | Common return path for all analog/digital functions; must be low-impedance for noise immunity |
| 4 PFI | Power-fail comparator input | Monitors external voltage; pulls PFO low when PFI < 1.212V or VCC < VSW |
| 5 BATT ON | External bypass switch driver | Open-drain output indicating BATT active; drives PMOS/NPN base/gate for >75mA loads |
| 6 PFO | Power-fail comparator output | Active-low flag signaling power failure or enabling battery freshness seal when pulled low |
| 7 CE IN | Chip-enable input | Controls CE gating; high-impedance during reset to prevent spurious RAM writes |
| 8 CE OUT | Chip-enable output | Passes CE IN signal only when reset inactive; 46Ω series resistance in enabled mode |
Key Features
| Feature | Design Value |
|---|---|
| Fixed reset threshold | 2.55V–2.70V range (R-suffix) guarantees deterministic reset timing for 3.0V ±10% supplies |
| Battery switchover | VBATT can exceed VCC (e.g., 3.6V Li battery with 3.0V VCC); eliminates need for level-shifting circuitry |
| CE signal gating | 7ns max propagation delay and automatic disable during reset prevent RAM corruption on undervoltage |
| Low quiescent current | 24µA typical VCC supply current extends battery life in always-on backup applications |
| Robust voltage monitoring | Guaranteed reset assertion down to VCC = 1V ensures µP initialization even during deep brownout |
Applications
| Portable Medical Monitors | Industrial Data Loggers |
|---|---|
Use Scenario: Battery-powered ECG monitor operating on 3.0V main supply with 3.6V lithium backup maintains real-time data logging during AC power loss. IC Role / Device Role / Timing Role: MAX795RCSA+ monitors VCC, switches RAM supply to BATT within 15mV hysteresis window, and gates CE to freeze memory writes during switchover. Use Value: Prevents data corruption during 200ms reset timeout and enables >10-year backup runtime with sub-30µA total system quiescent current. | Use Scenario: Remote environmental sensor node powered by 3.0V solar-charged battery requires fail-safe RAM retention during intermittent shading events. IC Role / Device Role / Timing Role: MAX795RCSA+ asserts reset before VCC falls below 2.55V, disables CE OUT to halt MCU writes, and sustains CMOS RAM via BATT ON-driven PMOS switch. Use Value: Eliminates external MOSFET drivers and reduces BOM count by integrating switchover control and CE gating in 8-pin SO package. |
| Smart Utility Meters | Handheld Test Equipment |
Use Scenario: Electricity meter with tamper-detection EEPROM must retain billing data during 3.0V supply dips caused by grid transients. IC Role / Device Role / Timing Role: MAX795RCSA+ detects VCC drop to 2.52V, disconnects VCC from RAM, connects 3.6V BATT, and holds CE OUT low for 10µs to complete write cycle. Use Value: Meets IEC 62056-21 data integrity requirements with <7ns CE delay and guaranteed reset down to 1V VCC. | Use Scenario: Portable oscilloscope with 3.0V FPGA configuration memory requires glitch-free power sequencing during battery swaps. IC Role / Device Role / Timing Role: MAX795RCSA+ provides synchronized VCC/BATT switchover and CE gating to isolate FPGA memory during hot-swap transitions. Use Value: Enables zero-downtime battery replacement without FPGA reconfiguration or data loss in field-deployed instruments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX795SCSA+ | Reset threshold 2.85V–3.00V (S-suffix); higher trip point suitable for 3.3V ±10% systems | Used where tighter VCC tolerance requires earlier reset assertion before 2.85V | Select MAX795SCSA+ for 3.3V designs needing margin above 3.0V nominal; MAX795RCSA+ remains optimal for 3.0V ±10% systems |
| MAX795TCSA+ | Reset threshold 3.00V–3.15V (T-suffix); matches 3.3V ±5% supply tolerance | Deployed in high-reliability 3.3V systems where reset must trigger no later than 3.00V | Choose MAX795TCSA+ when VCC regulation is tighter; MAX795RCSA+ offers best fit for cost-sensitive 3.0V battery applications |
Compared with MAX795SCSA+ and MAX795TCSA+, the MAX795RCSA+ provides the lowest reset threshold (2.55V–2.70V), making it uniquely suited for 3.0V systems with wide input tolerance and extended battery discharge curves-while sharing identical 8-pin SO package, CE gating, and battery switchover architecture.
Availability
MAX795RCSA+ is available at Aetrix Electronics and suitable for portable medical monitors, industrial data loggers, and smart utility meters requiring stable component supply with long-term lifecycle support.
Supply support for MAX795RCSA+ 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 interface applications in industrial, automotive, and computing markets.
The MAX795 family delivers compact, low-power microprocessor supervisory circuits optimized for 3.0V/3.3V battery-backed systems requiring reliable reset, backup switchover, and memory protection-without integrated watchdog or manual reset complexity.
FAQ
What is the exact reset threshold voltage range for MAX795RCSA+?
The MAX795RCSA+ has a fixed reset threshold range of 2.55V to 2.70V (VCC falling), corresponding to the 'R' suffix per Maxim's selector guide. This range is guaranteed across temperature (0°C to +70°C) and ensures reset assertion before VCC drops below 2.55V, making it ideal for 3.0V ±10% systems. The MAX795RCSA+ does not support adjustable thresholds like the MAX794.
Does MAX795RCSA+ include a watchdog timer or manual reset input?
No, the MAX795RCSA+ excludes both watchdog timer and manual reset (MR) functionality-differentiating it from MAX793/MAX794 variants. Its 8-pin SO package accommodates only core supervisory functions: fixed reset, battery switchover, CE gating, and power-fail detection. Engineers requiring watchdog capability must select MAX793 or MAX794 instead.
How does MAX795RCSA+ handle backup-battery switchover when VBATT exceeds VCC?
The MAX795RCSA+ supports VBATT > VCC (e.g., 3.6V lithium battery with 3.0V VCC) via internal p-channel MOSFET switching. When VCC falls below the battery switch threshold (2.52V falling / 2.69V rising), OUT disconnects from VCC and connects to BATT. The 15mV typical hysteresis prevents oscillation, and switchover occurs seamlessly without external components.
What is the purpose of the BATT ON pin on MAX795RCSA+?
The BATT ON pin on MAX795RCSA+ is an open-drain output that goes high when OUT switches to BATT, signaling active battery backup. It drives the gate/base of external PMOS/NPN transistors to handle load currents exceeding 75mA-extending the device's current capability beyond its internal 75mA limit while maintaining precise switchover control.
Can MAX795RCSA+ be used in place of MAX793 or MAX794 in existing designs?
MAX795RCSA+ is not a drop-in replacement for MAX793/MAX794 due to missing pins (MR, WDI, WDO, BATT OK, LOWLINE) and omitted features (watchdog, manual reset, battery status). While it shares the same 8-pin SO package and core switchover/CE functions, redesign is required to remove unused signals and verify reset timing alignment with the 2.55V–2.70V threshold.
MAX795RCSA+ 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:
- Obsolete
- 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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX795RCSA+ FAQ
1.How can I place an order for MAX795RCSA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX795RCSA+ 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 MAX795RCSA+ reliable?
The price and inventory of MAX795RCSA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX795RCSA+ is usually 5 days.
3.What payment methods are accepted for MAX795RCSA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX795RCSA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX795RCSA+?
MAX795RCSA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX795RCSA+ 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 MAX795RCSA+?
For technical support, including MAX795RCSA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX795RCSA+ requirements.
6.How does Aetrix verify that MAX795RCSA+ is sourced from the original manufacturer or authorized distributors?
All MAX795RCSA+ 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 MAX795RCSA+ meets industry standards.
7.What is the process for return or replacement of MAX795RCSA+?
All MAX795RCSA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX795RCSA+, 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 MAX795RCSA+ part is unused and in its original packaging.
Return procedure for MAX795RCSA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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