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Analog Devices Inc./Maxim Integrated MAX795TESA+
- Part No.:
- MAX795TESA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX795TESA+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,423
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Product details
Overview
MAX795TESA+ from Maxim Integrated is an 8-pin SO microprocessor supervisory circuit for +3.0V/+3.3V systems, providing precision reset assertion (3.00V–3.15V threshold), backup-battery switchover (VBATT > VCC supported), on-board chip-enable gating (7ns max propagation delay), and guaranteed reset assertion down to VCC = 1V. It is used in battery-backed embedded controllers to maintain CMOS RAM integrity during brownouts.
For engineers reviewing the MAX795TESA+ datasheet, MAX795TESA+ pinout, MAX795TESA+ application, or MAX795TESA+ equivalent, key selection criteria include its fixed 3.0V–3.15V reset threshold, battery-switching capability with VBATT up to 3.6V, low 46µA typical VCC supply current, and integrated CE signal gating for RAM write protection.
Technical Context
The MAX795TESA+ implements a precision voltage comparator with 10mV typical hysteresis to prevent oscillation during VCC transitions, and asserts active-low RESET for ≥200ms after VCC rises above the 3.00V–3.15V threshold. Its internal p-channel MOSFET switch enables seamless switchover from VCC to BATT when VCC falls below the 2.55V–2.70V battery switch threshold (VSW), with <15mV hysteresis.
Unlike the MAX793/MAX794, the MAX795 lacks watchdog timer, LOWLINE comparator, BATT OK output, and manual reset input - confirming its role as a streamlined, cost-optimized supervisory IC focused solely on reset generation and battery-backed power routing for space-constrained 8-pin applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.00V–3.15V (VCC falling); ensures reliable reset before 3.3V system drops below 3.0V under ±5% tolerance |
| Battery Switch Threshold | 2.55V–2.70V (VCC falling); triggers switchover to backup battery before RAM corruption occurs |
| VCC Supply Current | 46µA typical (VCC = 3.3V); enables ultra-low-power operation in always-on battery backup mode |
| Output Drive Capability | 200mA sink/source on RESET; supports direct interface to most µP reset inputs without external buffer |
| Operating Voltage Range | VCC = 2.72V–5.5V; compatible with 3.0V/3.3V systems and legacy 5V logic interfaces |
| Package | 8-pin SO (SOIC); 150mil width, JEDEC MS-012AC, footprint-compatible with industry-standard 8-pin SO placements |
| Temperature Range | 0°C to +70°C; qualified for commercial-grade embedded controller applications |
Pinout & Package
MAX795TESA+ uses an 8-pin SO (SOIC) package with 150mil body width and standard 1.27mm pitch. Pin 1 is marked by a beveled corner or dot; pin numbering follows counterclockwise convention from pin 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 OUT | Supply output for CMOS RAM | Switched between VCC and BATT via internal p-MOSFET; connects to RAM VDD to maintain data during main supply loss |
| 2 VCC | Main supply input | Primary 3.0V/3.3V system rail; powers internal circuitry and defines reset threshold reference |
| 3 GND | Ground reference | Common return path for all analog comparators, digital logic, and output drivers |
| 4 PFI | Power-fail comparator input | Monitors external voltage (e.g., 5V rail); pulls PFO low when input falls below 1.212V–1.287V threshold |
| 5 PFO | Power-fail comparator output | Open-drain active-low flag signaling early power failure; used to trigger NMI or initiate graceful shutdown |
| 6 CE IN | Chip-enable input | Accepts µP CE signal; gated internally during reset to prevent spurious RAM writes |
| 7 CE OUT | Chip-enable output | Pass-through of CE IN during normal operation; held low for 10µs after reset assertion to complete write cycle |
| 8 BATT | Backup-battery input | Accepts 3.6V lithium cell; voltage may exceed VCC; isolated from circuit until VCC drops below VSW |
Key Features
| Feature | Design Value |
|---|---|
| Fixed reset trip voltage | 3.00V–3.15V range ensures compatibility with 3.3V ±5% systems without external resistor network |
| Battery voltage > VCC support | Enables use of standard 3.6V lithium coin cells in 3.0V/3.3V systems without level-shifting or diode drop penalties |
| Guaranteed reset to VCC = 1V | Ensures µP remains held in reset even during deep brownout, preventing undefined execution states |
| On-board CE gating with 7ns delay | Prevents corrupted RAM writes during undervoltage by blocking CE signals within 7ns of reset assertion |
| Low 46µA VCC supply current | Minimizes standby power draw in battery-backed systems, extending shelf life and operational runtime |
Applications
| Battery-Powered Embedded Controller | Critical µP Power Monitoring |
|---|---|
Use Scenario: Industrial sensor node with nonvolatile RAM storing calibration data and last-known state. IC Role / Device Role / Timing Role: Supervisory IC asserting reset and switching RAM supply to backup battery upon main rail collapse. Use Value: Prevents RAM data loss during 100ms–500ms power interruption; eliminates need for external power-fail detection circuitry. | Use Scenario: Medical diagnostic device requiring guaranteed boot integrity after AC mains interruption. IC Role / Device Role / Timing Role: Primary reset generator with precise 3.00V–3.15V threshold and 200ms timeout to meet IEC 62304 power-up reliability requirements. Use Value: Ensures µP never executes code below safe voltage margin; reduces qualification testing burden for safety-critical firmware. |
| Portable Equipment | Intelligent Controller |
Use Scenario: Handheld test instrument powered by rechargeable Li-ion with 3.3V system rail. IC Role / Device Role / Timing Role: Battery switchover controller maintaining real-time clock and configuration memory during hot-swap battery replacement. Use Value: Enables zero-downtime battery exchange; avoids full reinitialization and user data loss. | Use Scenario: Building automation controller managing HVAC schedules and occupancy logs. IC Role / Device Role / Timing Role: Dual-role supervisor providing both reset assertion and PFI-triggered early warning via PFO output. Use Value: Allows 50–100ms advance notification of impending power loss to save volatile state before shutdown. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX793TESA+ | 16-pin SO package; includes manual reset (MR), watchdog (WDI/WDO), LOWLINE comparator, and BATT OK output | Supports complex supervision with fault logging and early warning; requires larger PCB area and additional external components | Select when watchdog monitoring, manual reset, or battery health indication is required beyond basic reset and switchover |
| TPS3808G33DBVR | Single-channel 3.3V supervisor; no battery switchover, no PFI/PFO, no CE gating; 2% reset threshold accuracy vs. MAX795's ±2.5% | Suitable only for simple reset-only applications; cannot replace MAX795 in battery-backed RAM systems | Select only for cost-sensitive, non-battery-backed 3.3V systems where CE gating and power-fail warning are unnecessary |
Compared with MAX793TESA+, MAX795TESA+ trades watchdog, manual reset, and battery status features for smaller size and lower cost - making it optimal for space-constrained, battery-switchover–focused designs. Compared with TPS3808G33DBVR, MAX795TESA+ provides essential battery management and CE protection missing in basic supervisors.
Availability
MAX795TESA+ is available at Aetrix Electronics and suitable for battery-powered embedded controllers, critical µP power monitoring, and portable equipment requiring stable component supply across commercial temperature range and long-term production cycles.
Supply support for MAX795TESA+ 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 MAX795TESA+ belongs to Maxim's microprocessor supervisory product line, engineered specifically for compact, battery-backed 3.0V/3.3V systems needing reliable reset generation and seamless power switchover without added complexity.
FAQ
What is the reset threshold voltage range for MAX795TESA+?
The MAX795TESA+ has a fixed reset threshold range of 3.00V to 3.15V (VCC falling). This is specified for systems operating at 3.3V ±5%, ensuring reset is asserted before the supply drops below 3.0V while avoiding false triggers during nominal operation. The threshold is factory-trimmed and does not require external resistors - a key differentiator from the adjustable MAX794.
Does MAX795TESA+ support backup-battery switchover with VBATT > VCC?
Yes, MAX795TESA+ fully supports backup-battery switchover with VBATT exceeding VCC - up to 3.6V - enabling direct use of standard lithium coin cells in 3.0V/3.3V systems. When VCC falls below the 2.55V–2.70V battery switch threshold (VSW), the internal p-channel MOSFET automatically connects BATT to OUT, maintaining power to CMOS RAM without diode voltage drop or external FETs.
What is the function of the CE IN and CE OUT pins on MAX795TESA+?
The CE IN and CE OUT pins implement on-board chip-enable signal gating: CE IN accepts the µP's chip-enable signal, and CE OUT delivers a conditioned version to external memory. During reset assertion, CE OUT is disabled for 10µs to complete any ongoing RAM write, then held inactive - preventing corrupted writes during undervoltage. Propagation delay is ≤7ns, supporting high-speed µPs without timing penalty.
Can MAX795TESA+ be used without a backup battery?
Yes, MAX795TESA+ operates correctly without a backup battery. Connect BATT to VCC (or leave floating if unused per datasheet guidance), and the internal switch routes OUT directly from VCC. All supervision functions - including reset generation, PFI/PFO monitoring, and CE gating - remain fully functional. The device draws only 46µA typical supply current, making it suitable for non-battery applications where low quiescent power is valued.
What is the maximum load current supported on the OUT pin of MAX795TESA+?
The OUT pin of MAX795TESA+ supports up to 200mA continuous output current when sourced from VCC, and up to 250µA when sourced from BATT (with typical on-resistance of 12Ω at 25°C). This allows direct powering of small CMOS RAM devices or low-power real-time clocks. For loads exceeding 250µA in battery-backup mode, an external PMOS transistor driven by BATT ON (not present on MAX795) is required - confirming MAX795's design focus on moderate-current, space-optimized applications.
MAX795TESA+ 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:
- 3.075V
- 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
MAX795TESA+ FAQ
1.How can I place an order for MAX795TESA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX795TESA+ 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 MAX795TESA+ reliable?
The price and inventory of MAX795TESA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX795TESA+ is usually 5 days.
3.What payment methods are accepted for MAX795TESA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX795TESA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX795TESA+?
MAX795TESA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX795TESA+ 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 MAX795TESA+?
For technical support, including MAX795TESA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX795TESA+ requirements.
6.How does Aetrix verify that MAX795TESA+ is sourced from the original manufacturer or authorized distributors?
All MAX795TESA+ 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 MAX795TESA+ meets industry standards.
7.What is the process for return or replacement of MAX795TESA+?
All MAX795TESA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX795TESA+, 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 MAX795TESA+ part is unused and in its original packaging.
Return procedure for MAX795TESA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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