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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:401
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Product details
Overview
MAX793SESE+ from Maxim Integrated is a 3.3V/3.0V microprocessor supervisory circuit with fixed reset threshold (2.85V–3.00V), backup-battery switchover, active-low/open-drain RESET output, and integrated watchdog timer (1.6s timeout). It monitors VCC in embedded controllers and portable equipment, asserts reset below threshold, and gates CE signals to protect CMOS RAM during undervoltage.
For engineers reviewing the MAX793SESE+ datasheet, MAX793SESE+ pinout, MAX793SESE+ application, or MAX793SESE+ equivalent, this page delivers verified specifications, validated 16-pin narrow SO package mapping, confirmed battery-switching behavior (VBATT > VCC supported), and two field-validated alternative parts for 3.3V µP supervision with low-line warning and manual reset capability.
Technical Context
The MAX793SESE+ implements a precision voltage comparator with 10mV typical hysteresis to prevent oscillation during VCC transitions near the 2.85V–3.00V reset threshold. Its internal p-channel MOSFET switch enables seamless switchover from VCC to VBATT when VCC falls below VSW (2.68V typ), with <15mV hysteresis and guaranteed operation down to VCC = 1V.
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 to generate automatic reset pulses. The CE IN-to-CE OUT transmission gate provides 7ns max propagation delay and disables during reset to block erroneous chip-enable signals from corrupting RAM.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.85V to 3.00V (S-suffix), fixed and production-tested - ensures reliable reset assertion before 3.3V supply drops below system brownout margin. |
| Watchdog Timeout | 1.6s ±20% - provides deterministic fault recovery window for microprocessor firmware hang detection. |
| VCC Supply Current | 46µA typ at +25°C - enables ultra-low-power operation in battery-backed systems without compromising supervision accuracy. |
| Battery Switch Threshold | 2.68V typ (VCC falling) - guarantees clean switchover to backup battery before VCC reaches reset threshold, preventing data loss. |
| CE Propagation Delay | 7ns max - preserves timing integrity of chip-enable signals in high-speed µP interfaces with CMOS RAM. |
| Reset Timeout Period | 200ms min - meets JEDEC-standard minimum reset pulse width for reliable microprocessor initialization. |
| Operating Temp Range | 0°C to +70°C - qualified for commercial-grade embedded controller and portable equipment applications. |
Pinout & Package
MAX793SESE+ is housed in a 16-pin narrow SO (SOIC-16) package with 1.27mm pitch, 10.3mm × 7.5mm body, and exposed pad not present. Pin functions are electrically validated per Maxim's official datasheet revision 6 (19-0366).
| 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 or backup operation. |
| 2 VCC | Main Supply Input | Primary 3.0V/3.3V power rail input; reset and supervision logic referenced to this node. |
| 4 PFI | Power-Fail Comparator Input | Monitors external voltage for early power-fail warning; drives PFO low when input falls below 1.212V. |
| 5 BATT ON | Battery-On Indicator | Active-high logic output signaling BATT is active on OUT; used to drive external PMOS/NPN switch for >75mA loads. |
| 6 GND | Ground Reference | Common return path for all analog and digital circuitry; must be low-impedance connection to system ground plane. |
| 7 PFO | Power-Fail Comparator Output | Open-drain output pulled low when PFI < 1.212V or VCC < VSW; also enables battery freshness seal when grounded. |
| 8 MR | Manual Reset Input | Active-low input with 70µA internal pullup; asserts reset for 200ms after release - supports pushbutton or logic-driven reset initiation. |
| 9 WDO | Watchdog Output | Open-drain output asserted low on watchdog timeout; connects directly to MR to auto-generate reset on firmware hang. |
| 10 WDI | Watchdog Input | Edge-sensitive input requiring ≥100ns pulses; resets 1.6s timer on every transition - detects stalled or looping code. |
| 11 CE IN | Chip-Enable Input | Input to CE gating circuit; high-impedance during reset to isolate memory interface from corrupted address/data lines. |
| 12 CE OUT | Chip-Enable Output | Gated CE signal passed only when reset inactive; 46Ω series resistance matches standard µP drive requirements. |
| 13 RESET | Active-High Reset Output | Push-pull output sourcing/sinking current; inverse of RESET - drives µP reset directly without external pullup. |
| 14 LOWLINE | Low-Line Warning Output | Active-low comparator output asserting ~25mV below VRST - generates NMI for early brownout warning before reset. |
| 15 RESET | Active-Low Reset Output | Open-drain output requiring external pullup; guaranteed low for VCC < VRST and during MR assertion - standard µP reset interface. |
| 16 BATT | Backup Battery Input | Accepts 3.6V lithium cells; supports VBATT > VCC operation - enables long-term data retention during main power loss. |
Key Features
| Feature | Design Value |
|---|---|
| Precision Reset Monitoring | Fixed 2.85V–3.00V threshold with 10mV hysteresis - eliminates false resets during noisy or slow-rising VCC conditions. |
| Backup-Battery Switchover | Internal p-MOSFET with 2.68V typ switch point and <15mV hysteresis - ensures uninterrupted RAM power without external diodes or FETs. |
| On-Board CE Gating | 7ns max propagation delay and automatic disable during reset - prevents write corruption in CMOS RAM during undervoltage events. |
| Integrated Watchdog Timer | 1.6s timeout with edge-triggered WDI and WDO-to-MR reset loop - delivers autonomous firmware fault recovery without MCU intervention. |
| Battery Freshness Seal | Zero-leakage disconnect until first power cycle - preserves shelf life of backup battery in OEM inventory and field-deployed units. |
Applications
| Battery-Powered Portable Equipment | Embedded Industrial Controllers |
|---|---|
|
Use Scenario: Handheld medical meters and data loggers using 3.3V µPs and 3.6V coin-cell backup. IC Role / Device Role / Timing Role: Supervises VCC, switches RAM supply to battery on main power loss, and asserts reset before brownout. Use Value: Ensures zero-data-loss operation across power cycles and extends usable battery life via sub-50µA quiescent current. |
Use Scenario: PLC I/O modules operating in 0°C to +70°C industrial environments with 3.3V logic rails. IC Role / Device Role / Timing Role: Monitors 3.3V supply for brownout, provides 200ms reset pulse, and gates CE to protect configuration EEPROM. Use Value: Prevents spurious writes during line transients and enables deterministic recovery after AC mains interruption. |
| Critical µP Power Monitoring | Intelligent Edge Sensors |
|
Use Scenario: Networked gateway devices requiring guaranteed boot integrity after unexpected power loss. IC Role / Device Role / Timing Role: Generates precise reset pulse, monitors low-line condition for NMI-based pre-reset warning, and manages battery switchover. Use Value: Eliminates boot failures by enforcing strict VCC validity windows and enabling graceful shutdown via LOWLINE interrupt. |
Use Scenario: Wireless sensor nodes with sleep/wake cycles and nonvolatile memory retention requirements. IC Role / Device Role / Timing Role: Provides watchdog supervision of wake-up firmware, holds CE inactive during deep-sleep transitions, and maintains RAM state via BATT. Use Value: Reduces firmware validation burden by offloading reset timing, brownout detection, and memory protection to dedicated hardware. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX706SESA+ | Same 16-pin SO package, identical 2.85V–3.00V reset threshold, but no watchdog or CE gating; only RESET/RESET/LOWLINE outputs. | Lacks WDI/WDO and CE IN/OUT functionality - suitable only where basic reset and low-line warning suffice. | Select when cost sensitivity outweighs need for watchdog autonomy or RAM write protection. |
| TPS3808G33DBVR | 3.3V fixed reset (3.08V threshold), 200ms timeout, but no battery switchover, no CE gating, and no LOWLINE output. | Designed for single-rail 3.3V systems without backup battery support - requires external circuitry for RAM backup. | Choose for simplified 3.3V-only designs where battery independence is unnecessary and footprint is constrained. |
Compared with MAX706SESA+ and TPS3808G33DBVR, the MAX793SESE+ uniquely integrates battery switchover, watchdog timer, and CE signal gating in one 16-pin SO package - delivering full supervision capability without external components or layout compromises.
Availability
MAX793SESE+ is available at Aetrix Electronics and suitable for battery-powered portable equipment, embedded industrial controllers, and critical µP power monitoring applications requiring stable component supply, long-term lifecycle support, and traceable 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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, computing, and communications markets.
The MAX793SESE+ belongs to Maxim's µP supervisory circuits product line, designed specifically to ensure reliable boot-up, brownout protection, and data integrity in 3.0V/3.3V embedded systems with backup battery requirements.
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 (S-suffix), specified for VCC falling. This range is production-tested and guaranteed across temperature (0°C to +70°C) and supply variations, ensuring robust brownout detection in 3.3V systems with ±10% tolerance.
Does MAX793SESE+ support backup batteries with voltage higher than VCC?
Yes, MAX793SESE+ explicitly supports VBATT > VCC operation - up to 6.0V absolute maximum - enabling use of standard 3.6V lithium batteries in 3.0V/3.3V systems. The internal p-channel MOSFET switch automatically connects OUT to BATT when VCC falls below 2.68V (typ), with built-in hysteresis to prevent oscillation.
Can MAX793SESE+ be used without a backup battery?
Yes, MAX793SESE+ operates fully without a backup battery. Connect BATT to VCC and leave PFO unconnected or tied to VCC. All supervision functions - RESET assertion, LOWLINE warning, watchdog, and CE gating - remain active. The battery-related outputs (BATT OK, BATT ON) will be inactive but do not impair core functionality.
How does the watchdog timer in MAX793SESE+ interact with the reset function?
The MAX793SESE+ watchdog timer (1.6s timeout) asserts WDO low on timeout, which can be wired directly to MR to trigger a 200ms reset pulse. During active reset, the watchdog is disabled. When reset deasserts, the timer resumes counting - enabling autonomous recovery from firmware hangs without host processor involvement.
What is the purpose and activation method of the battery freshness seal in MAX793SESE+?
The battery freshness seal in MAX793SESE+ disconnects BATT from internal circuitry until first power-up, preserving shelf life. To activate: apply VCC > VRST, ground PFO for >200ms, then cycle VCC. Once enabled, the seal remains active until VCC exceeds VRST again - verified in Maxim's datasheet Figure 4 and Section "Battery Freshness Seal".
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:
- 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+ 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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