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Analog Devices Inc./Maxim Integrated MAX792SESE+T
- Part No.:
- MAX792SESE+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX792SESE+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,897
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Product details
Overview
MAX792SESE+T from Maxim Integrated is a microprocessor supervisory circuit providing reset generation, manual reset input, two-stage power-fail warning (low-line comparator 120mV above reset threshold), watchdog timer with pulsed fault output (WDPO), and chip-enable gating for CMOS RAM protection. It guarantees valid RESET output down to VCC = 1V and supports external reset/low-line threshold programming via resistor divider. Used in embedded controllers and industrial instrumentation requiring reliable power-up/down sequencing.
For engineers reviewing the MAX792SESE+T datasheet, MAX792SESE+T pinout, MAX792SESE+T application, or MAX792SESE+T equivalent, key selection criteria include guaranteed 1V reset validity, ±2% reset threshold accuracy (in MAX820 variant), 200ms reset timeout, 1.6s nominal watchdog period, and integrated CE signal gating with ≤10ns propagation delay.
Technical Context
The MAX792SESE+T implements dual independent comparators: one for reset assertion (with hysteresis) and another for low-line warning (120mV offset), both configurable in internal or external threshold mode via RESET IN/INT pin. Its watchdog function monitors WDI transitions and asserts WDPO (1.7ms pulse) followed by WDO (latched low) on timeout - enabling hardware shutdown via external flip-flop.
It integrates a transmission gate between CE IN and CE OUT, disabled during reset to prevent memory corruption; CE OUT remains low for 15µs after reset assertion if CE IN is low, ensuring write-cycle completion. The OVI/OVO pins form an uncommitted overvoltage comparator (1.30V threshold), electrically isolated from core supervision logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold Voltage | 2.91V nominal (S-suffix), ±2% accuracy in external programming mode - sets precise brownout detection point for 3V systems |
| Reset Timeout Period | 200ms typical - ensures µP remains held in reset long enough for stable clock and supply settling |
| Watchdog Timeout Period | 1.6s nominal (SWT tied to VCC) - provides sufficient margin for firmware execution loops without false triggers |
| CE Propagation Delay | 10ns maximum - enables compatibility with high-speed µPs and avoids timing violations in memory access paths |
| Supply Voltage Range | 2.75V to 5.5V - supports operation across 3V and 5V logic domains with guaranteed reset validity down to 1V |
| Low-Line Threshold Offset | 120mV above reset threshold - delivers advance NMI warning before reset assertion, enabling graceful shutdown |
| MR Input Threshold | 1.30V typical - allows direct connection to mechanical pushbuttons without external pull-up or debouncing circuitry |
Pinout & Package
MAX792SESE+T is housed in a 16-pin narrow SO (SOIC-16) package, 3.9mm body width, lead-free (+T suffix), RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 | RESET / RESET | Complementary active-low and active-high reset outputs; RESET sinks 1.6mA at 0.1V, valid down to VCC = 1V |
| 3 | VCC | Main supply input (2.75–5.5V); powers all internal circuits and drives CE OUT high-level output |
| 4 | RESET IN/INT | Mode select: ≤60mV → internal threshold mode; ≥600mV → external programming mode |
| 5 | LLIN/REFOUT | In external mode: low-line comparator input; in internal mode: buffered 1.30V reference output |
| 6 | OVO | Open-drain overvoltage comparator output (active-low, 1.30V threshold), electrically isolated from supervision logic |
| 7 | OVI | Inverting input of uncommitted overvoltage comparator; connect to GND if unused |
| 8 | SWT | Watchdog timeout configuration: tie to VCC for 1.6s default; connect capacitor to GND for adjustable timeout |
| 9 | MR | Manual reset input with internal 1.30V comparator and high-impedance pull-up to VCC |
| 10 | LOW LINE | Active-low low-line output; asserts 120mV above reset threshold to trigger µP NMI prior to reset |
| 11 | WDI | Watchdog input; transition resets internal timer; no activity >1.6s triggers WDPO/WDO assertion |
| 12 | GND | Analog/digital ground reference for all comparators, reset generator, and CE gate |
| 13 | CE OUT | Active-low chip-enable output; gated by CE IN and reset state; ensures memory write completion during power-down |
| 14 | CE IN | Chip-enable input; high-impedance when reset asserted; enables CE transmission gate during normal operation |
| 15 | WDO | Watchdog fault output; latched low until next WDI transition - used for system shutdown or interrupt |
| 16 | WDPO | Watchdog pulse output; 1.7ms low pulse preceding WDO by 70ns - clocks external D-flip-flop for two-fault shutdown |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed RESET validity down to VCC = 1V | Enables robust reset assertion even during deep brownout, preventing undefined µP states |
| Two-stage power-fail warning (RESET + LOW LINE) | Provides early NMI alert 120mV above reset threshold, allowing time-critical data save before reset |
| Pulsed watchdog output (WDPO) with 70ns advance warning | Allows deterministic hardware shutdown using external flip-flop on consecutive faults, avoiding software dependency |
| On-board CE signal gating with ≤10ns propagation delay | Prevents memory corruption during undervoltage by blocking CE signals while permitting write-cycle completion |
| External reset/low-line threshold programming | Supports custom voltage monitoring points via resistor divider on LLIN/REFOUT and RESET IN/INT pins |
| Uncommitted overvoltage comparator (OVI/OVO) | Provides independent overvoltage detection without affecting reset, watchdog, or CE functions |
Applications
| Industrial PLC Controller | Medical Diagnostic Instrument |
|---|---|
Use Scenario: Power monitoring in programmable logic controller with nonvolatile memory and real-time I/O. IC Role / Device Role / Timing Role: Supervisory IC generating synchronized RESET and LOW LINE signals, gating CE to protect EEPROM during brownout. Use Value: Prevents firmware corruption during line sags; 200ms reset timeout ensures FPGA configuration stability; WDPO-driven shutdown avoids hazardous actuator misfire. |
Use Scenario: Embedded subsystem in ultrasound imaging device requiring fail-safe boot and memory integrity. IC Role / Device Role / Timing Role: Dual-threshold supervisor asserting NMI (LOW LINE) then RESET to trigger controlled image buffer dump before power loss. Use Value: 120mV low-line offset enables 15ms advance warning before reset; CE gating prevents partial writes to calibration EEPROM during AC dropout. |
| Telecom Remote Terminal Unit | Automotive Body Control Module |
Use Scenario: Outdoor base station unit exposed to wide temperature (-40°C to +85°C) and voltage fluctuations. IC Role / Device Role / Timing Role: Voltage supervisor with manual reset (MR) for field service, watchdog for firmware hang detection, and OVI-based overvoltage alarm. Use Value: ±2% reset threshold accuracy (external mode) maintains trip point across temperature; WDPO pulse triggers backup power switchover before WDO latches. |
Use Scenario: Low-power BCM managing door locks, lighting, and CAN communication with battery backup. IC Role / Device Role / Timing Role: Supervisor monitoring 5V rail; uses MR for ignition-key-initiated reset; LOW LINE feeds µP NMI for battery-save mode entry. Use Value: Valid RESET at VCC = 1V ensures safe shutdown during cranking; 10ns CE delay preserves SPI flash access timing in 40MHz bus designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX820SESE+T | Identical pinout and function; guarantees ±2% reset/low-line threshold accuracy (vs. unspecified for MAX792) | Required where tighter voltage-monitoring tolerance is mandated (e.g., medical, aerospace) | Select MAX820SESE+T when design requires documented ±2% accuracy across temperature; otherwise MAX792SESE+T offers cost advantage. |
| TPS3823MPDBVR | Single-output reset (no LOW LINE or CE gating); fixed 3.08V threshold; no watchdog or manual reset | Suitable only for basic reset-only applications without NMI, memory protection, or fault logging | Choose TPS3823MPDBVR only if system lacks need for low-line warning, CE control, or watchdog - not a functional replacement. |
Compared with MAX820SESE+T, the MAX792SESE+T trades guaranteed ±2% threshold accuracy for lower cost while retaining identical functionality and pinout. Against TPS3823MPDBVR, it delivers comprehensive supervision (dual outputs, watchdog, CE gating) but requires more board space and design effort.
Availability
MAX792SESE+T is available at Aetrix Electronics and suitable for industrial automation, medical instrumentation, and telecom infrastructure requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for MAX792SESE+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) designs precision analog, mixed-signal, and power management ICs for demanding industrial, automotive, and communications applications.
The MAX792/MAX820 product line was engineered specifically for microprocessor-based systems needing coordinated reset, power-fail warning, watchdog supervision, and memory write protection - targeting reliability-critical embedded controllers and instrumentation.
FAQ
What is the reset threshold voltage for MAX792SESE+T?
The MAX792SESE+T has a nominal reset threshold voltage of 2.91V, corresponding to the 'S' suffix in its part number. This value is factory-trimmed and specified with typical accuracy in internal threshold mode; external programming mode allows adjustment via resistor divider, though absolute accuracy depends on component tolerances and temperature drift. The MAX792SESE+T datasheet confirms this threshold applies across the full operating temperature range (0°C to +70°C).
Does MAX792SESE+T support watchdog timeout adjustment?
Yes, the MAX792SESE+T supports adjustable watchdog timeout via the SWT pin. With SWT tied to VCC, the nominal timeout is 1.6 seconds. Connecting an external capacitor from SWT to GND changes the timeout period: for VCC = 5V, timeout = 16.2 × C (nF) ms; for VCC = 3V, timeout = 27 × C (nF) ms. Capacitor values must exceed 4.7nF, and SWT must never be left floating or grounded - these conditions are explicitly prohibited in the MAX792SESE+T datasheet.
How does the CE gating function work in MAX792SESE+T?
The MAX792SESE+T gates the CE signal between CE IN and CE OUT using an internal transmission gate. During normal operation (reset inactive), CE IN passes directly to CE OUT with ≤10ns propagation delay. When reset is asserted, the gate disables: if CE IN is low, CE OUT remains low for 15µs to complete the current memory write cycle; if CE IN is high, CE OUT goes high-impedance. This prevents spurious writes to CMOS RAM during undervoltage events.
Can MAX792SESE+T generate a valid reset signal below 2.75V supply?
Yes, the MAX792SESE+T guarantees valid RESET output down to VCC = 1V, as confirmed in the Absolute Maximum Ratings and Electrical Characteristics tables. While the minimum operating voltage is 2.75V, the reset comparator remains functional and produces a defined logic level (RESET sinks 1.6mA at 0.1V) even as VCC falls below that level - a critical feature for brownout recovery in systems with decaying backup supplies.
What is the purpose of the LLIN/REFOUT pin on MAX792SESE+T?
The LLIN/REFOUT pin serves dual roles depending on mode: in internal threshold mode (RESET IN/INT ≤60mV), it outputs a buffered 1.30V reference usable by external circuitry; in external programming mode (RESET IN/INT ≥600mV), it becomes the input to the low-line comparator, accepting a divided voltage to set the low-line trip point. Its behavior is strictly mode-dependent and cannot serve both functions simultaneously - the MAX792SESE+T datasheet defines this switching behavior unambiguously.
MAX792SESE+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:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.91V
- Output:
- Push-Pull, 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
MAX792SESE+T FAQ
1.How can I place an order for MAX792SESE+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX792SESE+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 MAX792SESE+T reliable?
The price and inventory of MAX792SESE+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX792SESE+T is usually 5 days.
3.What payment methods are accepted for MAX792SESE+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX792SESE+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX792SESE+T?
MAX792SESE+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX792SESE+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 MAX792SESE+T?
For technical support, including MAX792SESE+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX792SESE+T requirements.
6.How does Aetrix verify that MAX792SESE+T is sourced from the original manufacturer or authorized distributors?
All MAX792SESE+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 MAX792SESE+T meets industry standards.
7.What is the process for return or replacement of MAX792SESE+T?
All MAX792SESE+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX792SESE+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 MAX792SESE+T part is unused and in its original packaging.
Return procedure for MAX792SESE+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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