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Analog Devices Inc./Maxim Integrated MAX793SESE+T
- Part No.:
- MAX793SESE+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX793SESE+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,912
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Product details
Overview
MAX793SESE+T from Maxim Integrated is a 3.0V/3.3V microprocessor supervisory circuit with fixed reset threshold (2.85V–3.00V), backup-battery switchover, active-low reset output, and integrated watchdog timer (1.6s timeout). It monitors VCC supply integrity, asserts reset below threshold, gates chip-enable signals with ≤7ns propagation delay, and supports battery-freshness seal for lithium backup in portable controllers and embedded systems.
For engineers reviewing the MAX793SESE+T datasheet, MAX793SESE+T pinout, MAX793SESE+T application, or MAX793SESE+T equivalent, key selection criteria include guaranteed reset assertion down to VCC = 1V, battery voltage exceeding VCC capability (up to 3.6V), low-line early-warning output (LOWLINE), and precise reset hysteresis tolerance (±15mV) for stable brownout detection in industrial 3.3V systems.
Technical Context
The MAX793SESE+T implements a precision bandgap-based reset comparator with 2.85V–3.00V rising/falling threshold range (S-suffix), 10mV typical hysteresis, and guaranteed operation from VCC = 1V to 5.5V. Its internal p-channel MOSFET switch enables seamless VCC-to-battery switchover when VCC falls below 2.41V (typical battery switch threshold), with <15mV hysteresis to prevent oscillation.
It integrates a dedicated watchdog timer (1.6s timeout, non-disableable), manual reset input with 70µA internal pullup, and CE IN-to-CE OUT transmission gate with 7ns max propagation delay and 46Ω on-resistance. The BATT OK output continuously monitors VBATT against 2.0V min threshold and disables when VCC drops below VSW.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.85V–3.00V (VCC rising/falling); ensures reliable reset before 3.3V supply drops below system tolerance limit |
| Battery Switch Threshold | 2.41V (VCC falling); triggers automatic switchover to 3.6V lithium battery before VCC collapse |
| Reset Timeout Period | 200ms; guarantees µP remains held in reset long enough for stable power recovery |
| Watchdog Timeout | 1.6s; detects µP lockup by monitoring WDI transitions; non-disableable for safety-critical use |
| CE Propagation Delay | ≤7ns; preserves timing margins in high-speed memory access paths during undervoltage events |
| VCC Supply Current | 46µA (typ) at +25°C; enables ultra-low-power operation in battery-backed systems |
| BATT Leakage Current | 1µA (max); minimizes self-discharge of backup battery during long-term storage |
Pinout & Package
MAX793SESE+T is housed in a 16-pin narrow SO (SOIC-16) package with 1.27mm pitch, JEDEC MS-012AC compliant, and RoHS-compliant lead-free finish (+T suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUT (Pin 1) | Supply output for CMOS RAM | Switches between VCC and BATT via internal p-MOSFET; supports up to 75mA load in normal mode |
| VCC (Pin 2) | Main supply input | Accepts 2.72V–5.5V; powers internal circuitry and drives RESET, LOWLINE, CE OUT outputs |
| GND (Pin 6) | Ground reference | Common return path for all analog and digital functions; critical for reset threshold accuracy |
| PFI (Pin 4) | Power-fail comparator input | Monitors external voltage; asserts PFO low when input falls below 1.212V threshold |
| PFO (Pin 7) | Power-fail comparator output | Open-drain active-low signal used for NMI generation or battery freshness seal enable |
| RESET (Pin 15) | Active-low reset output | Open-drain output requiring external pullup; guaranteed low for VCC < VRST or MR low |
| RESET (Pin 13) | Active-high reset output | Push-pull output sourcing/sinking current; inverse of RESET; drives µP reset directly |
| MR (Pin 8) | Manual reset input | Active-low with 70µA internal pullup; asserts reset for 200ms after release for debounced operation |
| WDI (Pin 10) | Watchdog input | Accepts pulses ≥100ns wide; resets 1.6s watchdog timer on any edge transition |
| WDO (Pin 9) | Watchdog output | Active-low open-drain output; goes low on watchdog timeout; can be wired to MR for auto-reset |
| LOWLINE (Pin 14) | Early power-fail warning | Active-low output asserting when VCC falls to VLR (VRST − 15mV typ); enables NMI for graceful shutdown |
| CE IN (Pin 11) | Chip-enable input | Controls gating path; high-impedance during reset to isolate memory address decoder |
| CE OUT (Pin 12) | Chip-enable output | Passes CE IN only when reset inactive; 7ns max delay preserves memory timing integrity |
| BATT (Pin 16) | Backup-battery input | Accepts up to 6.0V; enables switchover even when VBATT > VCC (e.g., 3.6V Li battery in 3.3V system) |
| BATT ON (Pin 5) | Battery status indicator | Active-high logic output signaling OUT is sourced from BATT; drives external PMOS switch for >75mA loads |
| BATT OK (Pin 3) | Battery health monitor | Active-high output high only when VBATT ≥ 2.0V and VCC ≥ VSW; fails safe during brownout |
Key Features
| Feature | Design Value |
|---|---|
| Precision reset comparator | Fixed 2.85V–3.00V threshold with ±15mV tolerance over temperature ensures consistent brownout response in 3.3V systems |
| Backup-battery switchover | VBATT can exceed VCC (e.g., 3.6V Li battery with 3.3V VCC); automatic switching at 2.41V with 15mV hysteresis prevents chatter |
| On-board CE gating | 7ns max propagation delay and 46Ω on-resistance preserve memory timing while blocking corrupted writes during undervoltage |
| Integrated watchdog timer | 1.6s non-disableable timeout detects µP lockup; WDO output can be diode-OR'd to MR for autonomous fault recovery |
| Battery freshness seal | Enables OEMs to isolate backup battery until first power-up; reduces shelf-life discharge to <1µA |
| Low-line early warning | LOWLINE output asserts 15mV before reset threshold, providing time for NMI-driven data save before full reset |
Applications
| Battery-Powered Computers and Controllers | Embedded Controllers |
|---|---|
Use Scenario: Portable handheld terminal with 3.3V main supply and CR2032 lithium backup battery operating in intermittent field conditions. IC Role / Device Role / Timing Role: Supervisory IC providing VCC monitoring, battery switchover, and watchdog supervision to maintain RAM state and recover from µP hang. Use Value: Ensures 200ms reset pulse holds µP in known state during brownout; 1.6s watchdog forces reboot if firmware freezes; BATT OK confirms battery readiness before deployment. | Use Scenario: Industrial PLC module with 3.3V logic rail, CMOS SRAM for configuration storage, and requirement for graceful shutdown on power loss. IC Role / Device Role / Timing Role: Power supervisor generating LOWLINE NMI interrupt 15mV before reset to trigger EEPROM save, then asserting RESET to halt execution. Use Value: Prevents data corruption by gating CE signals during undervoltage; enables deterministic shutdown sequence without external logic. |
| Intelligent Controllers | Critical µP Power Monitoring |
Use Scenario: Smart meter with tamper-resistant backup power, requiring secure boot and runtime integrity verification. IC Role / Device Role / Timing Role: Dual-role supervisor: BATT OK validates backup source pre-boot; watchdog monitors firmware execution loop for security violations. Use Value: Battery freshness seal ensures full battery capacity at commissioning; non-disableable watchdog thwarts malicious code disabling reset. | Use Scenario: Medical diagnostic device with strict IEC 60601 power continuity requirements and 3.3V FPGA configuration memory. IC Role / Device Role / Timing Role: Primary power integrity monitor asserting RESET within 1µs of VCC crossing 2.85V threshold, with CE gating protecting FPGA config RAM. Use Value: Guaranteed reset assertion down to VCC = 1V prevents partial configuration; 7ns CE delay meets FPGA timing closure for 100MHz interfaces. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX793TESE+T | Reset threshold 3.00V–3.15V (T-suffix); higher trip point suited for tighter 3.3V ±5% supplies | Used where system requires reset before VCC drops below 3.15V (e.g., high-speed µP with narrow supply margin) | Select MAX793TESE+T when design uses 3.3V ±5% regulator and must avoid false resets near nominal voltage |
| MAX794SESE+T | Adjustable reset threshold via external resistor divider on RESET IN pin; no fixed S/T/R suffix | Required when reset voltage must be precisely tuned (e.g., custom 2.95V rail or multi-rail systems) | Choose MAX794SESE+T only if programmability justifies added external components and layout area |
Compared with MAX793SESE+T, the MAX793TESE+T offers higher reset threshold for tighter 3.3V tolerances, while MAX794SESE+T sacrifices fixed-threshold simplicity for external adjustability-neither is pin-compatible due to differing RESET IN pin assignment and internal logic.
Availability
MAX793SESE+T is available at Aetrix Electronics and suitable for battery-powered computers and controllers, embedded controllers, intelligent controllers, and critical µP power monitoring requiring stable component supply across industrial temperature ranges (0°C to +70°C).
Supply support for MAX793SESE+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 markets.
The MAX793 family is designed specifically for 3.0V/3.3V microprocessor supervision, delivering integrated reset, watchdog, battery switchover, and memory protection in a single 16-pin SO package for space-constrained embedded systems.
FAQ
What is the exact reset threshold voltage range for MAX793SESE+T?
The MAX793SESE+T has a fixed reset threshold range of 2.85V to 3.00V for both VCC rising and falling conditions, with 10mV typical hysteresis. This S-suffix variant is optimized for 3.3V ±10% power supplies, guaranteeing reset assertion before VCC drops below 2.85V and preventing spurious resets above 3.00V. The threshold is factory-trimmed and specified over the full operating temperature range (0°C to +70°C).
Does MAX793SESE+T support backup batteries with voltage higher than VCC?
Yes, MAX793SESE+T explicitly supports backup batteries with voltage exceeding VCC-such as 3.6V lithium cells in 3.3V systems. Its internal p-channel MOSFET switch enables automatic switchover when VCC falls below the battery switch threshold (2.41V typical), and VBATT may range from -0.3V to +6.0V independent of VCC. The device maintains <15mV hysteresis during switchover to prevent oscillation.
How does the watchdog timer in MAX793SESE+T function, and can it be disabled?
The MAX793SESE+T incorporates a non-disableable 1.6s watchdog timer that monitors transitions on the WDI pin. If no edge occurs within 1.6s, WDO goes low to signal a fault. The timer clears on any WDI transition or reset assertion. Since the watchdog cannot be disabled, it provides fail-safe supervision for safety-critical applications. WDO can be connected to MR via a diode to generate an automatic reset pulse on timeout.
What is the purpose and activation method of the battery freshness seal in MAX793SESE+T?
The battery freshness seal in MAX793SESE+T isolates the backup battery from internal circuitry until first power-up, minimizing shelf-life discharge. To activate it: connect battery to BATT, ground PFO, bring VCC above reset threshold, hold until reset deasserts (200ms), then cycle VCC down. Once enabled, the seal remains active until VCC rises above VRST again. Leakage current drops to ≤1µA, preserving battery capacity for years.
Can MAX793SESE+T gate chip-enable signals for CMOS RAM, and what is its timing performance?
Yes, MAX793SESE+T includes an integrated CE IN-to-CE OUT transmission gate that blocks erroneous memory writes during undervoltage. When reset is asserted, the gate disables and CE OUT remains low for 10µs (if CE IN was low) to complete ongoing write cycles. Its propagation delay is ≤7ns, and on-resistance is 46Ω, enabling compatibility with high-speed µPs and meeting tight timing budgets for 100MHz+ memory interfaces.
MAX793SESE+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:
- 2.925V
- Output:
- Open Drain, Push-Pull
- Reset:
- Active High/Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
MAX793SESE+T FAQ
1.How can I place an order for MAX793SESE+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX793SESE+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 MAX793SESE+T reliable?
The price and inventory of MAX793SESE+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX793SESE+T is usually 5 days.
3.What payment methods are accepted for MAX793SESE+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX793SESE+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX793SESE+T?
MAX793SESE+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX793SESE+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 MAX793SESE+T?
For technical support, including MAX793SESE+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX793SESE+T requirements.
6.How does Aetrix verify that MAX793SESE+T is sourced from the original manufacturer or authorized distributors?
All MAX793SESE+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 MAX793SESE+T meets industry standards.
7.What is the process for return or replacement of MAX793SESE+T?
All MAX793SESE+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX793SESE+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 MAX793SESE+T part is unused and in its original packaging.
Return procedure for MAX793SESE+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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