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Analog Devices Inc./Maxim Integrated MAX794CSE+T
- Part No.:
- MAX794CSE+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX794CSE+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
The MAX794CSE+T from Maxim Integrated is a 3.0V/3.3V adjustable microprocessor supervisory circuit featuring externally programmable reset threshold, backup-battery switchover (VBATT > VCC supported), active-high and open-drain reset outputs, and integrated watchdog timer with 1.6s timeout - used in battery-backed embedded controllers to ensure reliable power-up/down sequencing and brownout recovery.
For engineers reviewing the MAX794CSE+T datasheet, MAX794CSE+T pinout, MAX794CSE+T application, or MAX794CSE+T equivalent, key selection criteria include adjustable reset threshold via resistor divider, guaranteed reset assertion down to VCC = 1V, battery-freshness seal support, CE signal gating with ≤7ns propagation delay, and compatibility with 3.0V–3.3V µP systems requiring dual-supply monitoring and low-power backup operation.
Technical Context
The MAX794CSE+T implements an adjustable reset comparator referenced to RESET IN pin, enabling precise trip-point configuration across 2.55V–5.5V range. Its battery switchover logic uses internal p-channel MOSFETs with VSW hysteresis (~15mV) to prevent oscillation during VCC transitions near VBATT.
It integrates a 1.6s watchdog timer that clears on any WDI transition and asserts WDO low on timeout; WDO can be connected to MR for automatic fault-triggered reset. The CE IN-to-CE OUT transmission gate operates with <7ns propagation delay and disables during reset to protect CMOS RAM from undervoltage writes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | Externally adjustable via resistor divider on RESET IN pin (2.55V to 5.5V range) |
| Watchdog Timeout | 1.6s nominal; ensures µP software liveliness detection without external timing components |
| Battery Switchover | VSW ≈ 2.55–2.95V (VCC falling); supports VBATT up to 6.0V, exceeding VCC for 3.6V lithium cells |
| Reset Assertion Range | Guaranteed active for 0V < VCC < VRST; remains valid down to VCC = 1V with VBATT > 1V |
| CE Gating Propagation | ≤7ns max delay; enables real-time chip-enable control during µP address/data cycles |
| Supply Current | 46µA typical at VCC = 3.3V (normal mode); 32µA in battery-backup mode (VCC = 0V) |
| Operating Temp | 0°C to +70°C; qualified for commercial embedded controller environments |
Pinout & Package
MAX794CSE+T is housed in a 16-pin narrow SO (SOIC-16) package with 1.27mm pitch, 10.3mm × 7.5mm body size, and exposed pad optional for thermal enhancement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUT (Pin 1) | Supply output for CMOS RAM | Switches between VCC and BATT based on voltage thresholds; drives RAM VDD with low on-resistance |
| RESET IN (Pin 3) | Adjustable reset threshold input | Accepts external resistor divider to set custom VRST; tolerance depends on resistor precision |
| VCC (Pin 2) | Main supply input | Primary 3.0V/3.3V system rail; powers internal logic and enables battery switchover control |
| PFO (Pin 7) | Power-fail comparator output | Open-drain low when PFI < VPFT or VCC < VSW; also enables battery freshness seal when pulled low |
| RESET (Pin 13) | Active-high reset output | Sources/sinks current; complements open-drain RESET; directly drives µP reset input |
| CE OUT (Pin 12) | Chip-enable gated output | Passes CE IN only when reset inactive; prevents RAM corruption during undervoltage |
| GND (Pin 6) | Ground reference | Common return for all analog/digital functions; must be low-impedance for accurate threshold sensing |
| PFI (Pin 4) | Power-fail comparator input | Monitors auxiliary supply or VCC-derived voltage; triggers PFO when below 1.212–1.287V threshold |
| CE IN (Pin 11) | Chip-enable gated input | Input to CE transmission gate; high-impedance during reset to isolate RAM address path |
| WDO (Pin 9) | Watchdog output | Asserts low on 1.6s timeout; connects to MR for automatic fault recovery resets |
| MR (Pin 8) | Manual reset input | Active-low with 70µA internal pullup; holds reset for 200ms after release for clean µP restart |
| WDI (Pin 10) | Watchdog input | Edge-sensitive; detects ≥100ns pulses; clears watchdog timer on any transition |
| LOWLINE (Pin 14) | Early power-fail warning | Active-low NMI trigger when VCC drops to VLR (≈2.85–3.15V depending on variant) |
| RESET (Pin 15) | Open-drain active-low reset | Requires external pullup; asserts low for 200ms minimum during power failure or MR event |
| BATT (Pin 16) | Backup battery input | Accepts 3.6V lithium cell; disconnects via freshness seal until first power cycle |
| BATT ON (Pin 5) | Battery status indicator | Logic high when OUT is sourced from BATT; drives external PMOS/NPN switch for >75mA loads |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable Reset Threshold | Configurable over 2.55V–5.5V using external resistor divider on RESET IN, enabling precise match to system VCC tolerance |
| Battery Freshness Seal | Internally disconnects BATT from circuitry until first power cycle, preserving shelf life of 3.6V lithium backup cells |
| CE Signal Gating | Sub-7ns propagation delay and automatic disable during reset prevent corrupted writes to CMOS RAM under brownout |
| Guaranteed Low-VCC Reset | Asserts RESET down to VCC = 1V (with VBATT > 1V), ensuring µP remains held in reset even during deep discharge |
| Integrated Watchdog Timer | 1.6s timeout with edge-triggered WDI input eliminates need for external RC timing network or separate watchdog IC |
Applications
| Industrial Data Logger | Medical Handheld Monitor |
|---|---|
Use Scenario: Battery-powered field recorder capturing sensor data during intermittent AC power loss. IC Role / Device Role / Timing Role: Supervisory circuit monitors main 3.3V rail and switches RAM supply to 3.6V lithium backup; asserts RESET before VCC drops below 2.85V. Use Value: Prevents data corruption during power interruption by holding µP in reset and maintaining RAM voltage via seamless switchover. | Use Scenario: Portable vital-signs monitor with nonvolatile parameter storage and emergency alarm triggering. IC Role / Device Role / Timing Role: Provides early LOWLINE warning at 2.925V to initiate graceful shutdown; uses WDO→MR loop to force hard reset on firmware hang. Use Value: Ensures deterministic recovery from software lockup and preserves calibration data in battery-backed RAM during battery swaps. |
| Smart Energy Meter | Ruggedized Telematics Unit |
Use Scenario: Utility meter operating from mains with supercapacitor backup and tamper-detection logging. IC Role / Device Role / Timing Role: Monitors 3.0V system rail; uses PFI input to detect auxiliary supply drop; enables battery freshness seal to extend 10-year shelf life. Use Value: Guarantees accurate timekeeping and event logging continuity during grid outages without premature battery drain. | Use Scenario: In-vehicle GPS tracker subject to cold cranking (VCC dip to 1.8V) and vibration-induced reset glitches. IC Role / Device Role / Timing Role: Delivers robust reset assertion down to VCC = 1V; leverages MR pullup and noise-immune CE gating for reliable operation. Use Value: Eliminates spurious resets during engine start and maintains GPS position buffer integrity via protected RAM access. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX793CSE+T | Fixed reset threshold (3.00V–3.15V); includes BATT OK output and uncommitted voltage monitor | Lacks adjustable reset; suited for systems where fixed 3.3V ±5% monitoring suffices and battery status reporting is required | Select when precise external threshold tuning is unnecessary and BATT OK indication adds value |
| TPS3808G33DBVR | Fixed 3.3V reset threshold; no battery switchover or watchdog; lower quiescent current (1.1µA) | Designed for simple reset-only applications; cannot replace MAX794CSE+T in battery-backed or watchdog-dependent designs | Choose only for cost-sensitive, non-backup, non-watchdog 3.3V reset needs with ultra-low IQ |
Compared with MAX793CSE+T, the MAX794CSE+T trades BATT OK and fixed threshold for design flexibility via adjustable reset and retains watchdog/CE gating; versus TPS3808G33DBVR, it adds critical battery management and system-level fault recovery capabilities absent in basic reset supervisors.
Availability
MAX794CSE+T is available at Aetrix Electronics and suitable for industrial data loggers, medical handheld monitors, smart energy meters, ruggedized telematics units, and battery-powered embedded controllers requiring stable component supply and long-term lifecycle support.
Supply support for MAX794CSE+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, computing, and communications applications.
The MAX794CSE+T belongs to Maxim's microprocessor supervisory product line, engineered specifically for 3.0V/3.3V systems needing adjustable reset, battery backup coordination, and integrated watchdog functionality in space-constrained embedded designs.
FAQ
What is the reset threshold adjustment range for the MAX794CSE+T?
The MAX794CSE+T reset threshold is fully adjustable via an external resistor divider on the RESET IN pin, supporting a range from the battery switch threshold (VSW ≈ 2.55V) up to 5.5V. This allows precise alignment with system-specific VCC tolerances and brownout requirements without changing the IC.
Does the MAX794CSE+T support lithium backup batteries with voltage higher than VCC?
Yes, the MAX794CSE+T explicitly supports VBATT > VCC operation - including standard 3.6V lithium cells in 3.0V/3.3V systems. Its internal p-channel MOSFET switchover circuit handles up to 6.0V on BATT, with controlled transition hysteresis to prevent oscillation near VSW.
How does the battery freshness seal function on the MAX794CSE+T?
The MAX794CSE+T battery freshness seal disconnects the BATT pin from internal circuitry until first power-up. It is enabled by grounding PFO while bringing VCC above VRST and then cycling VCC down. Once activated, it remains engaged until VCC exceeds VRST again - preserving shelf life of backup cells.
Can the MAX794CSE+T generate a reset pulse automatically on watchdog timeout?
Yes, the MAX794CSE+T supports automatic reset generation on watchdog timeout by connecting WDO to MR. When WDO goes low due to 1.6s WDI inactivity, it pulls MR low, asserting RESET for 200ms. The internal 10µs delay ensures reliable capture of the fault event before WDO returns high.
What is the purpose of the CE IN and CE OUT pins on the MAX794CSE+T?
The CE IN and CE OUT pins implement a transmission gate that passes chip-enable signals to external memory only when reset is inactive. During reset assertion, CE OUT is disabled to prevent erroneous writes to CMOS RAM - a critical feature for data integrity in undervoltage conditions.
MAX794CSE+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-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:
- Adjustable/Selectable
- Output:
- Open Drain, Push-Pull
- Reset:
- Active High/Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
MAX794CSE+T FAQ
1.How can I place an order for MAX794CSE+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX794CSE+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 MAX794CSE+T reliable?
The price and inventory of MAX794CSE+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX794CSE+T is usually 5 days.
3.What payment methods are accepted for MAX794CSE+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX794CSE+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX794CSE+T?
MAX794CSE+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX794CSE+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 MAX794CSE+T?
For technical support, including MAX794CSE+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX794CSE+T requirements.
6.How does Aetrix verify that MAX794CSE+T is sourced from the original manufacturer or authorized distributors?
All MAX794CSE+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 MAX794CSE+T meets industry standards.
7.What is the process for return or replacement of MAX794CSE+T?
All MAX794CSE+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX794CSE+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 MAX794CSE+T part is unused and in its original packaging.
Return procedure for MAX794CSE+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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