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Analog Devices Inc./Maxim Integrated MAX795TCSA+T
- Part No.:
- MAX795TCSA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX795TCSA+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,600
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Product details
Overview
MAX795TCSA+T from Maxim Integrated is an 8-pin SO microprocessor supervisory circuit designed for +3.0V/+3.3V systems, providing precision reset assertion (3.00V–3.15V threshold), backup-battery switchover with VBATT > VCC support, and chip-enable signal gating with ≤7ns propagation delay. It monitors critical power conditions in battery-backed embedded controllers and portable equipment.
For engineers reviewing the MAX795TCSA+T datasheet, MAX795TCSA+T pinout, MAX795TCSA+T application, or MAX795TCSA+T equivalent, key selection criteria include guaranteed reset assertion down to VCC = 1V, battery-switch threshold hysteresis (15mV typ), CE IN-to-CE OUT on-resistance (46Ω typ), low-line early-warning output, and compatibility with 3.6V lithium backup batteries.
Technical Context
The MAX795TCSA+T implements a fixed-threshold reset comparator with 10mV typical hysteresis to prevent oscillation during VCC transitions, and integrates a bidirectional PMOS-based power switch that automatically routes OUT between VCC and BATT based on VCC vs. VSW (2.55V–2.95V) comparison. Its CE gating path uses a transmission gate architecture enabling/disabling under reset control.
Unlike the MAX793/MAX794, it omits manual reset input (MR), watchdog timer (WDI/WDO), battery OK output, and external reset threshold programming-confirming its role as a streamlined, cost-optimized variant focused solely on reset supervision and battery switchover in space-constrained 8-pin SO applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.00V to 3.15V (VCC falling); ensures reliable reset before 3.3V supply drops below system tolerance limit |
| Battery Switch Threshold | 2.55V to 2.95V (VCC falling); enables seamless switchover to 3.6V Li battery before VCC collapses |
| Supply Current (VCC = 3.3V) | 24µA to 35µA; ultra-low quiescent draw extends battery life in always-on backup mode |
| CE IN-to-CE OUT Delay | ≤7ns max; preserves timing integrity for high-speed µP address/data bus gating |
| Reset Timeout Period | 140ms to 280ms; provides sufficient hold time for µP initialization after power recovery |
| Operating Voltage Range | VCC = 2.72V to 5.5V, VBATT = –0.3V to +6.0V; supports wide-input industrial and portable designs |
| Package | 8-pin SO (SOIC); 150mil width, RoHS-compliant lead-free (+T suffix) |
Pinout & Package
MAX795TCSA+T is housed in an 8-pin SOIC package (150mil width), with gull-wing leads, JEDEC MS-012AC compliant, thermal pad optional. Pin 1 marked by beveled corner or dot.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 OUT | Supply Output | Switched output connected to VCC or BATT; powers CMOS RAM during main/battery modes |
| 2 VCC | Main Supply Input | +3.0V/+3.3V primary power rail; reset monitoring and internal logic reference |
| 3 GND | Ground Reference | Common return path for all analog/digital functions; required for accurate threshold sensing |
| 4 PFI | Power-Fail Comparator Input | Monitors external voltage for early warning; pulls PFO low when below 1.212V–1.287V threshold |
| 5 BATT ON | Battery-Switch Status Output | Active-high open-drain signal indicating OUT is sourced from BATT (not VCC) |
| 6 PFO | Power-Fail Comparator Output | Open-drain active-low output asserting when PFI < VPFT or VCC < VSW |
| 7 CE IN | Chip-Enable Input | Input to CE gating circuit; disables CE OUT during undervoltage/reset condition |
| 8 CE OUT | Chip-Enable Output | Gated CE signal passed only when reset inactive; prevents RAM corruption during brownout |
Key Features
| Feature | Design Value |
|---|---|
| Fixed Reset Threshold (T-suffix) | 3.00V–3.15V range optimized for 3.3V ±5% systems with 10% margin; eliminates external resistor network |
| Backup-Battery Switchover | VBATT may exceed VCC (e.g., 3.6V Li battery with 3.3V VCC); automatic MOSFET switching with 15mV hysteresis |
| Chip-Enable Gating | 7ns max propagation delay and 46Ω on-resistance ensure compatibility with fast µPs without timing violation |
| Guaranteed Reset to VCC = 1V | Ensures valid reset assertion even during deep brownout, supporting robust low-voltage recovery |
| Low-Line Early Warning | PFI/PFO pair provides programmable pre-fail indication at user-defined threshold (1.212V–1.287V) |
Applications
| Battery-Powered Portable Equipment | Embedded Controller Power Monitoring |
|---|---|
Use Scenario: Handheld medical device with nonvolatile SRAM retaining calibration data during battery swaps. IC Role / Device Role / Timing Role: Supervisory IC providing VCC-monitored reset and seamless BATT switchover to maintain RAM retention. Use Value: Prevents data loss during hot-swap of 3.6V coin cell while ensuring µP restarts cleanly upon main supply restoration. | Use Scenario: Industrial PLC module requiring deterministic reset behavior during 3.3V rail fluctuations. IC Role / Device Role / Timing Role: Precision reset supervisor with 140–280ms timeout and CE gating to isolate memory during undervoltage. Use Value: Eliminates spurious writes to configuration EEPROM during transient dips, improving field reliability. |
| Critical µP Power Monitoring | Intelligent Sensor Node |
Use Scenario: Remote telemetry unit powered by solar-charged Li battery, operating across –40°C to +85°C. IC Role / Device Role / Timing Role: Temperature-stable reset monitor (±0.5% VRST drift over temp) and battery-status signaling via BATT ON. Use Value: Guarantees µP reset validity at cold temperature extremes where VCC droop is most severe. | Use Scenario: Wireless sensor node with sleep/wake cycles and SRAM-based state storage. IC Role / Device Role / Timing Role: Low-quiescent-current (24µA typ) supervisor enabling long battery life while protecting RAM during wake-up transients. Use Value: Reduces average current draw during sleep mode without compromising brownout protection. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX793TCSA+ | 16-pin SO package; includes MR input, WDI/WDO watchdog, BATT OK output, and LOWLINE comparator | Supports full-featured supervision including manual reset and watchdog fault detection | Select when watchdog timer or manual reset capability is required; not pin-compatible due to larger footprint |
| TPS3808G33DBVR | TI part with 3.3V fixed reset threshold, 200ms timeout, no battery switchover or CE gating | Lacks backup-battery management and memory protection features | Choose for basic reset-only applications where battery backup and RAM gating are unnecessary |
Compared with MAX793TCSA+, MAX795TCSA+T reduces pin count and feature set to lower cost and board area, while retaining core reset and battery switchover functionality; versus TPS3808G33DBVR, it uniquely integrates battery-aware power routing and CE signal protection essential for RAM-retentive systems.
Availability
MAX795TCSA+T is available at Aetrix Electronics and suitable for battery-powered portable equipment, embedded controller power monitoring, and critical µP power monitoring requiring stable component supply across industrial temperature ranges (–40°C to +85°C).
Supply support for MAX795TCSA+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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, automotive, and communications markets.
The MAX793/MAX794/MAX795 product line delivers integrated microprocessor supervision with battery switchover, CE gating, and early-warning comparators-designed specifically for reliable operation in 3.0V/3.3V battery-backed embedded systems.
FAQ
What is the reset threshold voltage range for MAX795TCSA+T?
The MAX795TCSA+T has a fixed reset threshold range of 3.00V to 3.15V (VCC falling), specified for use in +3.3V systems with ±5% supply tolerance. This threshold is factory-set by the "T" suffix and does not require external resistors. The device guarantees reset assertion before VCC falls below 3.00V and holds reset until VCC rises above 3.15V, ensuring clean µP initialization during power-up and immunity to brief supply dips.
Does MAX795TCSA+T support backup-battery switchover with VBATT > VCC?
Yes, MAX795TCSA+T fully supports backup-battery switchover where VBATT exceeds VCC-enabling use of standard 3.6V lithium batteries with 3.3V main supplies. Its internal PMOS switch automatically connects OUT to BATT when VCC falls below the battery switch threshold (2.55V–2.95V), and reconnects to VCC when VCC rises above the reset threshold. The 15mV typical hysteresis prevents oscillation during transition.
What is the function of the CE IN and CE OUT pins on MAX795TCSA+T?
On MAX795TCSA+T, CE IN accepts the microprocessor's chip-enable signal, and CE OUT delivers a gated version that is disabled during reset or undervoltage conditions. This prevents erroneous writes to CMOS RAM when VCC is marginal. The path features ≤7ns propagation delay and 46Ω on-resistance, preserving timing integrity for high-speed µPs. CE OUT is pulled up to OUT, ensuring correct logic levels during battery-backup mode.
Can MAX795TCSA+T be used without a backup battery?
Yes, MAX795TCSA+T operates correctly with no backup battery installed. In that case, connect BATT to VCC and OUT, and leave BATT ON and PFO unconnected or tied appropriately. The device continues to provide precise reset supervision, low-line warning via PFI/PFO, and CE gating-all independent of battery presence. Battery-related functions (BATT ON, switchover logic) become inactive but do not impair core supervision functionality.
What is the maximum operating temperature range for MAX795TCSA+T?
The MAX795TCSA+T is rated for operation from –40°C to +85°C, matching the "E" grade temperature specification per Maxim's ordering nomenclature. This industrial-grade range is confirmed in the Absolute Maximum Ratings and Electrical Characteristics tables, where parameters like reset timeout (140–280ms), supply current (24–35µA), and switch thresholds are guaranteed across this full span. The "CSA" package code denotes 8-pin SO with extended temperature capability.
MAX795TCSA+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:
- 3.075V
- 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
MAX795TCSA+T FAQ
1.How can I place an order for MAX795TCSA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX795TCSA+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 MAX795TCSA+T reliable?
The price and inventory of MAX795TCSA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX795TCSA+T is usually 5 days.
3.What payment methods are accepted for MAX795TCSA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX795TCSA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX795TCSA+T?
MAX795TCSA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX795TCSA+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 MAX795TCSA+T?
For technical support, including MAX795TCSA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX795TCSA+T requirements.
6.How does Aetrix verify that MAX795TCSA+T is sourced from the original manufacturer or authorized distributors?
All MAX795TCSA+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 MAX795TCSA+T meets industry standards.
7.What is the process for return or replacement of MAX795TCSA+T?
All MAX795TCSA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX795TCSA+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 MAX795TCSA+T part is unused and in its original packaging.
Return procedure for MAX795TCSA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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