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Analog Devices Inc./Maxim Integrated MAX792MESE+
- Part No.:
- MAX792MESE+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX792MESE+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,246
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Product details
Overview
MAX792MESE+ from Maxim Integrated is a microprocessor supervisory circuit providing reset generation, manual reset input, two-stage power-fail warning (low-line comparator), watchdog timer with pulsed fault output, and chip-enable signal gating for nonvolatile memory protection. It features a 4.37V internal reset threshold, guaranteed RESET validity down to VCC = 1V, and 200ms reset timeout. Used in embedded controllers and industrial instrumentation requiring reliable power-up/down monitoring.
For engineers reviewing the MAX792MESE+ datasheet, MAX792MESE+ pinout, MAX792MESE+ application, or MAX792MESE+ equivalent, key selection considerations include its factory-programmed 4.37V reset threshold, ±2% low-line accuracy (in external mode), 1.6s nominal watchdog timeout, and integrated CE gating with 10ns max propagation delay - all critical for deterministic µP boot sequencing and memory write-cycle completion.
Technical Context
The MAX792MESE+ implements dual independent comparators: one for reset assertion (with hysteresis) and another for low-line warning (120mV above reset threshold). Its watchdog function uses an RC-timed oscillator referenced to SWT pin capacitance, supporting configurable timeouts via external capacitor (k = 16.2 at VCC = 5V).
It integrates a bidirectional transmission gate for CE signal control, disabling CE OUT during reset while preserving write-cycle integrity via 15µs hold time if CE IN is low at reset assertion. The RESET IN/INT pin selects between internal fixed thresholds and externally programmable modes using resistor dividers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold Voltage | 4.37V nominal (M-suffix), ±2% accuracy in external programming mode - ensures precise brownout detection aligned with 5V system rails. |
| Power-On Reset Timeout | 200ms typical - guarantees sufficient hold time for µP initialization before release of RESET signal. |
| Watchdog Timeout (default) | 1.6s nominal with SWT tied to VCC - provides robust software activity monitoring without external timing components. |
| CE Propagation Delay | 10ns maximum - enables compatibility with high-speed µPs and prevents race conditions during memory access. |
| RESET Validity Range | Guaranteed functional down to VCC = 1V - supports fail-safe reset assertion even during deep undervoltage conditions. |
| Supply Current | 70µA typical at +25°C - minimizes impact on standby power in battery-backed or low-power systems. |
| Operating Temperature | 0°C to +70°C - qualified for commercial-grade industrial and computing applications. |
Pinout & Package
MAX792MESE+ is housed in a 16-pin narrow SO (Small Outline) package, 3.9mm width, RoHS-compliant lead-free construction (indicated by '+' suffix). Pin pitch is 0.050", body dimensions 9.9mm × 3.9mm × 1.75mm.
| 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 (2.75V–5.5V); powers all internal circuits and drives outputs. |
| 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 - asserts low when OVI > 1.30V; uncommitted, no effect on other functions. |
| 7 | OVI | Inverting input of overvoltage comparator; connect to GND if unused. |
| 8 | SWT | Set Watchdog Timeout input - tie to VCC for 1.6s default; connect capacitor to GND for adjustable timeout (k=16.2 @ 5V). |
| 9 | MR | Manual-reset input - internally pulled up; 1.30V threshold; 25µs minimum pulse width required. |
| 10 | LOW LINE | Active-low low-line warning output - asserts 120mV above reset threshold in internal mode. |
| 11 | WDI | Watchdog input - transition resets timer; no activity > timeout asserts WDPO/WDO. |
| 12 | GND | Ground reference for all analog and digital circuitry. |
| 13 | CE OUT | Chip-enable output - gated version of CE IN; disabled during reset to prevent memory corruption. |
| 14 | CE IN | Chip-enable input - passes through transmission gate to CE OUT when reset inactive. |
| 15 | WDO | Watchdog output - open-drain, asserts low after WDPO pulse if no WDI transition occurs. |
| 16 | WDPO | Watchdog-pulse output - 500µs–6ms pulse preceding WDO assertion by 70ns; used for early fault indication or flip-flop clocking. |
Key Features
| Feature | Design Value |
|---|---|
| Two-stage power-fail warning | Independent low-line comparator triggers 120mV above reset threshold - enables NMI generation before full reset, allowing graceful shutdown. |
| Pulsed watchdog output (WDPO) | 500µs–6ms advance warning pulse preceding WDO - allows external logic (e.g., D-flip-flop) to implement two-fault latching shutdown. |
| On-board CE signal gating | 10ns max propagation delay with 15µs hold time on CE OUT during reset - ensures CMOS RAM write-cycle completion under brownout. |
| Memory write-cycle completion support | CE IN remains active until CE OUT completes current low state - prevents partial writes during power collapse. |
| Voltage monitor for overvoltage warning | Dedicated OVI/OVO comparator with 1.30V threshold - provides independent overvoltage detection without affecting reset or watchdog behavior. |
Applications
| Industrial PLC Controller | Medical Diagnostic Instrument |
|---|---|
|
Use Scenario: Power monitoring in a DIN-rail mounted PLC with isolated I/O and real-time OS. IC Role / Device Role / Timing Role: Supervisory IC generating synchronized RESET and LOW LINE signals; gates CE to EEPROM during undervoltage events. Use Value: Prevents firmware corruption during line sags by holding CE OUT low for 15µs after reset assertion, ensuring write-cycle completion. |
Use Scenario: Embedded controller in portable ultrasound device with battery backup and flash memory logging. IC Role / Device Role / Timing Role: Dual-threshold supervisor asserting NMI (LOW LINE) at 4.49V and RESET at 4.37V to trigger data save before shutdown. Use Value: 200ms reset timeout ensures full OS shutdown sequence execution; WDPO pulse clocks safety latch on second watchdog fault. |
| Telecom Remote Terminal Unit | Automotive Body Control Module (non-AEC-Q100) |
|
Use Scenario: Outdoor RTU powered by PoE with transient-prone 48V-to-5V conversion. IC Role / Device Role / Timing Role: Provides brownout reset, manual reset via front-panel button, and overvoltage detection on auxiliary rail. Use Value: OVI/OVO comparator monitors 12V auxiliary supply independently; MR pin accepts direct pushbutton connection without external pull-up. |
Use Scenario: Non-safety-critical BCM in 12V automotive subsystem with CAN interface and EEPROM configuration storage. IC Role / Device Role / Timing Role: Ensures deterministic µP boot after ignition cycle; gates CE to prevent EEPROM corruption during cranking voltage dip. Use Value: RESET valid down to VCC = 1V guarantees reset assertion even during 6V cranking dips; 4.37V threshold matches 5V LDO tolerance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX692AESA+ | Same 16-pin SO package; 4.63V reset threshold (L-suffix); no WDPO output; only single watchdog output (WDO). | Lacks pulsed watchdog warning - unsuitable where early fault indication or two-fault latching is required. | Select when only basic reset + watchdog is needed and 4.63V threshold better matches system rail. |
| TPS3823MPW | TI part in 8-pin TSSOP; 3.08V reset threshold; no CE gating; no low-line comparator; no WDPO. | Missing low-line warning and CE control - cannot replace MAX792MESE+ in memory-critical or NMI-requiring designs. | Consider only for space-constrained 3.3V systems where full feature set is unnecessary. |
Compared with MAX692AESA+ and TPS3823MPW, the MAX792MESE+ uniquely combines low-line warning, CE gating, and WDPO pulse output in a single 16-pin SO package - essential for systems requiring both graceful shutdown and hardware-enforced fail-safe response.
Availability
MAX792MESE+ is available at Aetrix Electronics and suitable for industrial PLCs, medical diagnostic instruments, telecom remote terminal units, and automotive body control modules requiring stable component supply across extended product lifecycles.
Supply support for MAX792MESE+ 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 precision analog, mixed-signal, and power management ICs for industrial, computing, and communications markets.
The MAX792/MAX820 family was designed specifically for microprocessor supervisory functions in systems without battery backup - integrating reset, watchdog, low-line warning, and memory protection in a single chip to eliminate discrete supervision solutions.
FAQ
What is the reset threshold voltage of the MAX792MESE+?
The MAX792MESE+ has a factory-programmed internal reset threshold voltage of 4.37V (M-suffix), with ±2% accuracy in external programming mode. This value is specified in the Ordering Information table and confirmed in the Electrical Characteristics section under "Reset Threshold Voltage - Internal Threshold Mode." The threshold remains stable over temperature with normalized drift below ±1.5% across 0°C to +70°C.
Does the MAX792MESE+ support external reset threshold programming?
Yes, the MAX792MESE+ supports external reset threshold programming via the RESET IN/INT and LLIN/REFOUT pins. When RESET IN/INT is biased above 600mV, the internal voltage divider disconnects and external resistor dividers can set custom low-line and reset thresholds - enabling adaptation to non-standard supply rails such as 3.3V or 2.5V systems.
How does the watchdog timeout period work on the MAX792MESE+?
The MAX792MESE+ defaults to a 1.6s watchdog timeout when the SWT pin is tied to VCC. To adjust it, connect a capacitor from SWT to GND: timeout = k × C (in nF), where k = 16.2 at VCC = 5V and k = 27 at VCC = 3V. Capacitor values must exceed 4.7nF; the timeout range spans ~50ms to >200s depending on capacitance and supply voltage.
What is the purpose of the WDPO pin on the MAX792MESE+?
The WDPO (Watchdog-Pulse Output) pin on the MAX792MESE+ delivers a 500µs–6ms low pulse 70ns before WDO assertion, providing advance warning of impending watchdog fault. This enables external logic - such as a D flip-flop - to implement two-consecutive-fault latching, converting transient software hangs into permanent hardware shutdown for safety-critical operation.
Can the MAX792MESE+ be used with 3.3V microprocessors?
Yes, the MAX792MESE+ operates from VCC = 2.75V to 5.5V and supports 3.3V systems. Its 4.37V reset threshold is intended for 5V rails, but external programming mode allows reconfiguration for 3.3V supplies using resistor dividers. All logic thresholds (MR, WDI, CE IN) scale with VCC, and outputs drive correctly at 3.3V levels when VCC = 3.3V.
MAX792MESE+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.37V
- 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
MAX792MESE+ FAQ
1.How can I place an order for MAX792MESE+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX792MESE+ 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 MAX792MESE+ reliable?
The price and inventory of MAX792MESE+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX792MESE+ is usually 5 days.
3.What payment methods are accepted for MAX792MESE+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX792MESE+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX792MESE+?
MAX792MESE+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX792MESE+ 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 MAX792MESE+?
For technical support, including MAX792MESE+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX792MESE+ requirements.
6.How does Aetrix verify that MAX792MESE+ is sourced from the original manufacturer or authorized distributors?
All MAX792MESE+ 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 MAX792MESE+ meets industry standards.
7.What is the process for return or replacement of MAX792MESE+?
All MAX792MESE+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX792MESE+, 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 MAX792MESE+ part is unused and in its original packaging.
Return procedure for MAX792MESE+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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