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Analog Devices Inc./Maxim Integrated MAX795SCSA-T
- Part No.:
- MAX795SCSA-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX795SCSA-T.pdf
- Description:
- IC SUPERVISOR MPU
- Quantity:
- Payment:
- Shipping:
Inventory:1,884
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Product details
Overview
MAX795SCSA-T from Maxim Integrated is a 3.3V microprocessor supervisory circuit in 8-pin SO package, providing precision reset assertion (3.00V–3.15V threshold), backup-battery switchover (VBATT > VCC supported), and chip-enable gating with ≤7ns propagation delay. It monitors critical power rails in portable controllers and embedded systems requiring reliable brownout protection and CMOS RAM write protection.
For engineers reviewing the MAX795SCSA-T datasheet, MAX795SCSA-T pinout, MAX795SCSA-T application, or MAX795SCSA-T equivalent, key selection criteria include guaranteed reset assertion down to VCC = 1V, battery-switch threshold hysteresis (15mV typical), low-line early-warning output (LOWLINE), and compatibility with 3.0V/3.3V µP supply tolerances per JEDEC JESD8-12A.
Technical Context
The MAX795SCSA-T implements a fixed-threshold reset comparator with 10mV typical hysteresis to prevent oscillation during VCC transitions, and integrates a p-channel MOSFET switch for seamless VCC-to-battery switchover when VCC falls below VSW (2.55V min). Its CE IN-to-CE OUT transmission gate operates with <7ns propagation delay under 50Ω/50pF test conditions and disables automatically during reset assertion to protect CMOS RAM.
Unlike the MAX793/MAX794, the MAX795SCSA-T 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 on core voltage monitoring and power-path control 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 reset assertion before 3.3V supply drops below 10% tolerance limit |
| Battery Switch Threshold | 2.55V min (VCC falling); triggers switchover to backup battery before RAM data loss in 3.3V systems |
| VCC Supply Current | 46µA typ at +25°C; enables ultra-low-power operation in battery-backed portable equipment |
| CE Propagation Delay | ≤7ns max; preserves timing integrity for high-speed µP address/data bus gating without added latency |
| Operating Voltage Range | VCC = 2.72V to 5.5V; supports dual-supply systems and legacy 5V peripherals while supervising 3.3V core logic |
| Reset Timeout Period | 140ms to 280ms; provides sufficient hold time for µP initialization across temperature (-40°C to +85°C) |
| Low-Line Warning Threshold | VLOWLINE − VRST = 5mV to 60mV; delivers early NMI alert 20–50ms before reset assertion for graceful shutdown |
Pinout & Package
MAX795SCSA-T is housed in an 8-pin SO (Small Outline) package, 3.9mm × 4.9mm body, 1.27mm pitch, RoHS-compliant lead-free finish.
| 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/battery modes |
| 2 VCC | Main Supply Input | Primary 3.0V/3.3V system rail input; reset asserted when voltage falls below 3.00V (min) |
| 3 GND | Ground Reference | Common return path for all analog comparators, digital outputs, and internal switching elements |
| 4 PFI | Power-Fail Comparator Input | Monitors external voltage (e.g., +5V rail); pulls PFO low if input falls below 1.212V threshold |
| 5 BATT ON | Battery Status Indicator | Open-drain logic-high when OUT is sourced from BATT; drives PMOS gate for >75mA load support |
| 6 PFO | Power-Fail Output | Active-low open-drain output signaling VCC drop below VSW or PFI below VPFT; used for NMI or freshness seal enable |
| 7 CE IN | Chip-Enable Input | Accepts µP CE signal; gated internally during reset to prevent spurious writes to RAM |
| 8 CE OUT | Chip-Enable Output | Controlled pass-through of CE IN; disabled during reset to isolate RAM from undervoltage corruption |
Key Features
| Feature | Design Value |
|---|---|
| Precision Fixed Reset Threshold | 3.00V–3.15V range with 10mV hysteresis ensures deterministic reset timing across temperature and supply variation |
| VCC-to-Battery Switchover | Internal p-MOSFET switch supports VBATT up to 6.0V and VCC as low as 1.0V, enabling use of 3.6V lithium cells in 3.3V systems |
| Chip-Enable Gating | Sub-7ns CE IN-to-CE OUT propagation delay preserves µP bus timing while blocking invalid CE during brownout |
| Low-Line Early Warning | LOWLINE output asserts 5–60mV below reset threshold, enabling 20–50ms advance notice for controlled shutdown |
| Guaranteed Reset Below 1V | RESET remains valid down to VCC = 1V (with VBATT > 1V), ensuring fail-safe behavior even during deep brownout |
Applications
| Portable Medical Monitors | Industrial Data Loggers |
|---|---|
Use Scenario: Battery-powered ECG or glucose meter operating on single 3.6V Li coin cell with 3.3V MCU and SRAM. IC Role / Device Role / Timing Role: Supervises 3.3V rail, switches RAM supply to battery at 2.55V, and signals low-VCC via LOWLINE for firmware-triggered data save. Use Value: Prevents RAM corruption during battery depletion and enables deterministic shutdown before data loss. | Use Scenario: Ruggedized environmental sensor node logging temperature/humidity to SPI FRAM using 3.3V µC. IC Role / Device Role / Timing Role: Monitors main 3.3V supply, gates CE to FRAM during undervoltage, and asserts PFO to trigger emergency flash commit. Use Value: Eliminates need for external CE logic or discrete MOSFETs, reducing BOM count and PCB area by 30%. |
| Point-of-Sale Terminals | Railway Signaling Controllers |
Use Scenario: Handheld POS terminal with 3.3V ARM Cortex-M4, 512KB SRAM, and 3.6V backup battery. IC Role / Device Role / Timing Role: Provides 200ms reset pulse on power-up/fall, gates CE to SRAM, and uses BATT ON to drive external PMOS for high-current RAM retention. Use Value: Ensures boot reliability after hot-swap battery replacement and maintains RAM state during AC outage. | Use Scenario: EN 5012x-certified trackside controller powered from 24V DC converted to 3.3V, with supercap backup. IC Role / Device Role / Timing Role: Detects 3.3V rail collapse within 10µs, asserts RESET to halt safety-critical code, and isolates memory via CE gating. Use Value: Meets SIL-2 requirement for undervoltage response time (<100µs) and prevents unsafe state transitions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX793SCSA-T | 16-pin SO package; includes MR input, WDI/WDO watchdog, BATT OK output, and battery freshness seal | Required where manual reset, watchdog fault detection, or battery health monitoring is needed | Select MAX793SCSA-T only if full feature set justifies larger footprint and higher cost |
| TPS3808G33DBVR | TI device; 3.3V fixed reset, 350ms timeout, no CE gating or battery switchover; 5-pin SOT-23 | Suitable for basic reset-only applications without RAM protection or backup power management | Choose TPS3808G33DBVR when board space is critical and CE gating/battery features are unnecessary |
Compared with MAX793SCSA-T, MAX795SCSA-T reduces pin count and cost by removing watchdog, MR, and BATT OK - making it optimal for compact, battery-switchover–focused designs. Versus TPS3808G33DBVR, MAX795SCSA-T adds essential CE gating and VCC/BATT path control, enabling robust RAM retention in portable systems.
Availability
MAX795SCSA-T is available at Aetrix Electronics and suitable for portable medical monitors, industrial data loggers, point-of-sale terminals, and railway signaling controllers requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX795SCSA-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 computing applications.
The MAX795SCSA-T belongs to Maxim's microprocessor supervisory product line, designed specifically to provide reliable power monitoring, reset generation, and memory protection in space-constrained 3.0V/3.3V embedded systems.
FAQ
What is the exact reset threshold voltage range for MAX795SCSA-T?
The MAX795SCSA-T has a fixed reset threshold range of 3.00V to 3.15V (VCC falling), specified for 3.3V ±5% systems. This range ensures reset assertion occurs before the supply drops below 10% tolerance (3.0V), guaranteeing µP stability during brownout. The threshold is factory-trimmed and does not require external components - unlike the adjustable MAX794 series.
Does MAX795SCSA-T support backup-battery switchover with VBATT > VCC?
Yes, MAX795SCSA-T fully supports VBATT exceeding VCC - up to 6.0V - using an internal p-channel MOSFET switch. When VCC falls below the battery switch threshold (VSW = 2.55V min), OUT automatically connects to BATT. This enables use of standard 3.6V lithium batteries in 3.3V systems without external diodes or regulators.
What is the function of the CE IN and CE OUT pins on MAX795SCSA-T?
The CE IN and CE OUT pins implement chip-enable signal gating: CE IN accepts the µP's chip-select signal, and CE OUT delivers a conditioned version that is disabled during reset assertion. This prevents spurious writes to CMOS RAM during undervoltage. Propagation delay is ≤7ns, preserving timing margins for high-speed µPs like ARM Cortex-M series.
Can MAX795SCSA-T generate a low-line warning before reset assertion?
Yes, MAX795SCSA-T provides an early low-line warning via the LOWLINE output, which asserts when VCC falls to VLR = VRST − (5mV to 60mV). This gives designers 20–50ms advance notice before reset triggers, allowing firmware to execute safe shutdown routines, save volatile data, or disable peripherals before power collapse.
Is MAX795SCSA-T compatible with both 3.0V and 3.3V microprocessor systems?
Yes, MAX795SCSA-T operates across VCC = 2.72V to 5.5V and is explicitly rated for 3.0V/3.3V systems. Its 3.00V–3.15V reset threshold aligns with JEDEC JESD8-12A for 3.3V supplies (±5%), while the 2.55V–2.70V battery switch threshold supports 3.0V systems with ±10% tolerance. Electrical characteristics are validated across this full range.
MAX795SCSA-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- 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-T FAQ
1.How can I place an order for MAX795SCSA-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX795SCSA-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 MAX795SCSA-T reliable?
The price and inventory of MAX795SCSA-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX795SCSA-T is usually 5 days.
3.What payment methods are accepted for MAX795SCSA-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX795SCSA-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX795SCSA-T?
MAX795SCSA-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX795SCSA-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 MAX795SCSA-T?
For technical support, including MAX795SCSA-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX795SCSA-T requirements.
6.How does Aetrix verify that MAX795SCSA-T is sourced from the original manufacturer or authorized distributors?
All MAX795SCSA-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 MAX795SCSA-T meets industry standards.
7.What is the process for return or replacement of MAX795SCSA-T?
All MAX795SCSA-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX795SCSA-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 MAX795SCSA-T part is unused and in its original packaging.
Return procedure for MAX795SCSA-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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