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Analog Devices Inc./Maxim Integrated MAX793SESE
- Part No.:
- MAX793SESE
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX793SESE.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,325
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Product details
Overview
MAX793SESE from Maxim Integrated is a 3.3V microprocessor supervisory circuit with fixed 2.85V–3.00V reset threshold, backup-battery switchover, active-low/open-drain RESET output, and integrated watchdog timer (1.6s timeout). It monitors VCC supply integrity, asserts reset during brownout or manual trigger, gates CE signals with ≤7ns propagation delay, and supports battery-backed CMOS RAM in portable controllers and embedded systems.
For engineers reviewing the MAX793SESE datasheet, MAX793SESE pinout, MAX793SESE application, or MAX793SESE 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 for stable power-fail detection in 3.3V industrial control and battery-powered computing.
Technical Context
The MAX793SESE implements a precision bandgap-based reset comparator with 10mV typical hysteresis and 2.85V–3.00V falling-threshold range (S-suffix), ensuring reliable reset assertion before critical µP operation fails. Its internal p-channel MOSFET switch enables seamless VCC-to-BATT switchover when VCC drops below VSW (2.41V typ), with <15mV hysteresis to prevent oscillation.
It integrates a 1.6s watchdog timer that clears on any WDI transition and drives WDO low on timeout; WDO can be connected to MR to generate automatic system reset. The CE IN-to-CE OUT transmission gate operates with 7ns max propagation delay and disables during reset to protect RAM writes, while LOWLINE provides early NMI warning at VCC = 2.925V (falling).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold Range | 2.85V to 3.00V (VCC falling); ensures reset before 3.3V ±10% supply collapses below safe operating margin |
| Reset Timeout Period | 200ms minimum; guarantees µP remains held in reset long enough to stabilize clocks and peripherals after power recovery |
| Battery Switch Threshold | 2.41V (typical, VCC falling); triggers switchover to backup battery before RAM data loss in brownout |
| Watchdog Timeout | 1.6s ±25%; provides deterministic fault detection window for firmware liveliness monitoring |
| VCC Supply Current | 46µA (typ, VCC = 3.3V); enables ultra-low-power operation in always-on supervisory mode |
| CE Propagation Delay | ≤7ns; preserves timing margins for high-speed µP address/data bus gating without violating setup/hold requirements |
| Low-Line Warning Threshold | 2.925V (VCC falling); generates early NMI alert 90mV above reset threshold for graceful shutdown preparation |
Pinout & Package
MAX793SESE is housed in a 16-pin narrow SO package (SOIC-16, 3.9mm width), RoHS-compliant, with standard JEDEC MS-012AC footprint and 1.27mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUT (Pin 1) | Supply output for CMOS RAM | Switches between VCC and BATT via internal p-MOSFET; maintains RAM voltage during main supply failure |
| VCC (Pin 2) | Main supply input | Primary 3.0V/3.3V power rail monitored for reset and low-line events |
| GND (Pin 6) | Ground reference | Common return path for all analog comparators, digital logic, and output drivers |
| PFI (Pin 4) | Power-fail comparator input | Accepts external voltage divider for programmable PFO activation; tied to VCC if unused |
| PFO (Pin 7) | Power-fail comparator output | Open-drain active-low signal indicating VCC < VPFT or battery switchover; enables battery freshness seal |
| RESET (Pin 15) | Active-low open-drain reset output | Drives µP reset pin low for ≥200ms; requires external pull-up; guaranteed valid down to VCC = 1V |
| RESET (Pin 13) | Active-high reset output | Sources/sinks current; inverse of RESET; used for direct logic-level reset signaling |
| MR (Pin 8) | Manual reset input | Active-low with 70µA internal pull-up; asserts reset for 200ms after release; TTL/CMOS compatible |
| WDI (Pin 10) | Watchdog input | Edge-sensitive; clears 1.6s timer on any transition; detects pulses ≥100ns wide |
| WDO (Pin 9) | Watchdog output | Active-low open-drain; goes low on timeout; connects to MR for automatic watchdog-triggered reset |
| LOWLINE (Pin 14) | Early power-fail warning output | Active-low; asserts at VCC = 2.925V (falling); used to generate NMI for preemptive shutdown |
| BATT OK (Pin 3) | Battery status output | Active-high; indicates VBATT > 2.0V (min); disabled and low when VCC < VSW |
| BATT (Pin 16) | Backup-battery input | Accepts 3.6V lithium cell; voltage may exceed VCC; disconnects via freshness seal until first power cycle |
| BATT ON (Pin 5) | External bypass switch driver | Logic-high when OUT is connected to BATT; drives gate/base of external PMOS/PNP for >75mA load support |
| CE IN (Pin 11) | Chip-enable input | Controls CE gating path; high-impedance during reset to prevent spurious memory access |
| CE OUT (Pin 12) | Chip-enable output | Passes CE signal only when reset inactive; 7ns max delay preserves µP timing budgets |
Key Features
| Feature | Design Value |
|---|---|
| Precision reset comparator | Fixed 2.85V–3.00V threshold with 10mV hysteresis ensures noise-immune, repeatable reset timing across temperature |
| Backup-battery switchover | VBATT up to 3.6V exceeds VCC; internal p-MOSFET enables seamless RAM power continuity during main supply collapse |
| On-board CE signal gating | 7ns max propagation delay and automatic disable during reset prevent corrupted writes to battery-backed CMOS RAM |
| Integrated watchdog timer | 1.6s timeout with edge-triggered WDI input provides deterministic firmware liveliness monitoring without external components |
| Low-line early warning | LOWLINE output asserts 90mV above reset threshold (2.925V) to enable NMI-driven graceful shutdown before reset occurs |
| Battery freshness seal | Disables battery leakage (<1nA at +25°C) until first power cycle, preserving shelf life of installed lithium backup cells |
Applications
| Battery-Powered Computers | Embedded Controllers |
|---|---|
Use Scenario: Portable handheld terminal with SRAM-based configuration storage and lithium coin-cell backup. IC Role / Device Role / Timing Role: Supervises 3.3V main supply, switches RAM power to battery on brownout, asserts RESET to halt CPU, and signals LOWLINE for OS-initiated save-and-shutdown. Use Value: Prevents data corruption during unexpected power loss and extends usable battery life via freshness seal and sub-50µA quiescent current. | Use Scenario: Industrial PLC module requiring deterministic reset behavior and RAM retention during AC line dips. IC Role / Device Role / Timing Role: Monitors 3.3V logic rail, generates 200ms reset pulse on undervoltage, gates CE lines to isolate I/O memory, and uses WDO→MR loop for watchdog-recovery. Use Value: Ensures fail-safe state restoration after power anomaly and eliminates need for external reset IC + discrete watchdog + battery switch. |
| Intelligent Controllers | Critical µP Power Monitoring |
Use Scenario: Smart meter with real-time clock and tamper-proof event logging in nonvolatile RAM. IC Role / Device Role / Timing Role: Provides BATT OK status for battery health reporting, asserts RESET on VCC drop below 2.85V, and uses PFO to trigger backup power enable sequence. Use Value: Guarantees accurate timekeeping and secure log integrity during extended mains outage via controlled switchover and low-leakage battery interface. | Use Scenario: Medical diagnostic device where µP must never execute invalid code due to marginal supply conditions. IC Role / Device Role / Timing Role: Delivers guaranteed reset assertion down to VCC = 1V, monitors low-line condition 90mV pre-reset, and disables CE paths to prevent memory access errors. Use Value: Meets IEC 62304 safety requirements for power-supply fault response and eliminates single-point failure in critical data path. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX793TESE | Reset threshold 3.00V–3.15V (T-suffix); higher trip point suited for tighter 3.3V ±5% supplies | Used where system requires reset only after deeper supply sag; less aggressive than S-version for noise-prone environments | Select MAX793TESE when main supply regulation is tighter and early reset is undesirable |
| MAX795SESE | 8-pin SO package (vs. 16-pin); omits LOWLINE, BATT OK, WDI/WDO, CE gating; retains RESET, PFO, MR, BATT switchover | Targeted at space-constrained designs needing only core reset + battery backup, no watchdog or early warning | Choose MAX795SESE for simplified BOM and smaller footprint where advanced features are unnecessary |
Compared with MAX793TESE, the MAX793SESE triggers reset earlier (2.85V vs. 3.00V), improving brownout resilience in noisy 3.3V systems; versus MAX795SESE, it provides full feature set including watchdog, CE gating, and dual reset outputs-justifying the larger 16-pin SO package in complex embedded controllers.
Availability
MAX793SESE is available at Aetrix Electronics and suitable for battery-powered computers, embedded controllers, and intelligent controllers requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant sourcing.
Supply support for MAX793SESE 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, mixed-signal, and power-management ICs for industrial, automotive, communications, and computing applications.
The MAX793 family delivers integrated microprocessor supervision-including reset, watchdog, battery switchover, and CE gating-for 3.0V/3.3V systems where reliability, low power, and board space efficiency are critical.
FAQ
What is the exact reset threshold voltage range for MAX793SESE?
The MAX793SESE has a fixed reset threshold range of 2.85V to 3.00V (VCC falling), corresponding to the 'S' suffix per Maxim's ordering guide. This range is optimized for 3.3V ±10% power supplies, guaranteeing reset assertion before VCC falls below 2.85V while avoiding false triggers above 3.00V. The threshold exhibits 10mV typical hysteresis to ensure noise immunity during supply transients.
Does MAX793SESE support backup batteries with voltage higher than VCC?
Yes, MAX793SESE supports backup batteries up to 3.6V-even when VCC is 3.0V or 3.3V-via its internal p-channel MOSFET switchover circuit. When VCC falls below the battery switch threshold (2.41V typical), OUT automatically connects to BATT. The device tolerates VBATT > VCC continuously and includes a battery freshness seal to minimize leakage (<1nA) until first power-up.
How does the watchdog function operate in MAX793SESE?
The MAX793SESE incorporates a 1.6s watchdog timer that monitors the WDI input. Any rising or falling edge on WDI clears the timer; if no edge occurs within 1.6s, WDO goes low. WDO can be connected directly to MR to generate an automatic 200ms reset pulse. The watchdog cannot be disabled and remains active whenever VCC > VSW, providing continuous firmware liveliness assurance.
What is the purpose and behavior of the LOWLINE output on MAX793SESE?
The LOWLINE output on MAX793SESE is an active-low early power-fail warning signal that asserts when VCC falls to 2.925V (VCC falling), 90mV above the 2.85V reset threshold. It is designed to drive an NMI input on the microprocessor, enabling the system to perform critical save operations or orderly shutdown before reset occurs. LOWLINE remains asserted until VCC rises above 3.075V (VCC rising).
Can MAX793SESE be used without a backup battery?
Yes, MAX793SESE functions fully without a backup battery. Connect BATT to VCC and leave the battery-related outputs (BATT OK, BATT ON) unconnected or unused. The device still provides VCC monitoring, RESET generation, LOWLINE warning, MR input, PFO/PFI functionality, and CE gating. Battery switchover circuitry is disabled when VBATT ≈ VCC, and all supervisory features remain operational in single-supply mode.
MAX793SESE Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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 FAQ
1.How can I place an order for MAX793SESE through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX793SESE 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 reliable?
The price and inventory of MAX793SESE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX793SESE is usually 5 days.
3.What payment methods are accepted for MAX793SESE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX793SESE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX793SESE?
MAX793SESE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX793SESE 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?
For technical support, including MAX793SESE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX793SESE requirements.
6.How does Aetrix verify that MAX793SESE is sourced from the original manufacturer or authorized distributors?
All MAX793SESE 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 meets industry standards.
7.What is the process for return or replacement of MAX793SESE?
All MAX793SESE units undergo pre-shipment inspection (PSI). If there is an issue with MAX793SESE, 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 part is unused and in its original packaging.
Return procedure for MAX793SESE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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