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Analog Devices Inc./Maxim Integrated MAX792LCSE
- Part No.:
- MAX792LCSE
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX792LCSE.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,218
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Product details
Overview
MAX792LCSE from Maxim Integrated is a microprocessor supervisory circuit providing reset generation, manual reset input, two-stage power-fail warning (low-line detection 120mV above reset threshold), watchdog timer with pulsed fault output (WDPO), and chip-enable gating for nonvolatile memory protection. It operates from 2.75V to 5.5V, guarantees RESET validity down to VCC = 1V, and features ±2% reset threshold accuracy in internal mode. Used in embedded controllers and industrial instrumentation requiring reliable power-up/down sequencing.
For engineers reviewing the MAX792LCSE datasheet, MAX792LCSE pinout, MAX792LCSE application, or MAX792LCSE equivalent, this page delivers verified functional identity, confirmed 16-pin narrow SO package mapping, validated 4.62V nominal reset threshold, exact watchdog timeout behavior (1.6s default), and real-world CE gating timing (10ns max propagation delay) - all extracted from Maxim's official 19-0147 Rev. 4 datasheet.
Technical Context
The MAX792LCSE integrates independent reset, low-line, overvoltage, and watchdog comparators with internal 1.30V reference and programmable thresholds via external resistor divider. Its dual reset outputs (active-low RESET and active-high RESET) are synchronized to a 200ms power-on reset delay, while the low-line comparator asserts LOW LINE 120mV above the reset threshold with 15mV hysteresis.
Watchdog functionality uses WDI edge detection with 1.6s nominal timeout (adjustable via SWT capacitor), generating WDPO pulse (min 500µs) followed by WDO assertion after 70ns. Chip-enable gating employs a transmission gate with 10ns max CE IN → CE OUT propagation delay and automatic disable during reset to prevent memory corruption.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold Voltage | 4.62V nominal (L-suffix), ±2% accuracy in internal mode - ensures precise brownout detection at system supply rails. |
| Power-On Reset Delay | 200ms typical - guarantees µP initialization completes before code execution begins. |
| Watchdog Timeout Period | 1.6s nominal (SWT = VCC); adjustable via capacitor - provides configurable software fault detection window. |
| CE Propagation Delay | 10ns maximum - enables compatibility with high-speed µPs and prevents memory write corruption during voltage transients. |
| RESET Validity Range | Guaranteed down to VCC = 1V - supports robust reset assertion even during deep brownout conditions. |
| Supply Current | 70µA typical at +25°C - minimizes quiescent power in battery-backed or low-power systems. |
| Operating Temperature | 0°C to +70°C - qualified for commercial-grade embedded control and instrumentation applications. |
Pinout & Package
MAX792LCSE is housed in a 16-pin narrow SO (Small Outline) package, 3.9mm body width, 1.27mm pitch, RoHS-compliant lead-free option available with '+' suffix.
| 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 comparators and logic. |
| 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 | Overvoltage comparator output (open-drain); goes low when OVI > 1.30V - uncommitted function. |
| 7 | OVI | Inverting input to overvoltage comparator; connect to GND if unused. |
| 8 | SWT | Set watchdog timeout: tied to VCC for 1.6s default; capacitor to GND selects alternate timeout (k×C). |
| 9 | MR | Manual reset input; internally pulled up to VCC; 12µs propagation delay; 25µs minimum pulse width. |
| 10 | LOW LINE | Active-low low-line output; asserts 120mV above reset threshold - used for NMI generation. |
| 11 | WDI | Watchdog input; edge-triggered; resets timer on any transition (min 100ns pulse at VCC = 5V). |
| 12 | GND | Ground reference for all analog and digital circuitry. |
| 13 | CE OUT | Chip-enable output; gated pass-through of CE IN during normal operation; disabled during reset. |
| 14 | CE IN | Chip-enable input; high-impedance during reset; enables memory write-cycle completion via 15µs hold time. |
| 15 | WDO | Watchdog output; goes low after WDPO pulse if no WDI transition occurs - indicates software fault. |
| 16 | WDPO | Watchdog-pulse output; 500µs–6ms pulse preceding WDO assertion - enables hardware shutdown latching. |
Key Features
| Feature | Design Value |
|---|---|
| Two-stage power-fail warning | LOW LINE asserts 120mV above reset threshold with 15mV hysteresis - enables early NMI before full reset. |
| Pulsed watchdog output (WDPO) | 500µs–6ms advance warning pulse preceding WDO - allows external flip-flop latching for two-fault shutdown. |
| On-board chip-enable gating | 10ns max CE IN → CE OUT propagation delay with automatic disable during reset - prevents RAM corruption. |
| Memory write-cycle completion | CE OUT remains low for 15µs after reset assertion if CE IN was low - ensures ongoing memory writes finish. |
| Voltage monitor for overvoltage warning | OVI/OVO pair forms uncommitted comparator with 1.30V threshold - supports custom overvoltage detection. |
Applications
| Industrial PLC Controller | Medical Diagnostic Instrument |
|---|---|
Use Scenario: Power monitoring in DIN-rail mounted programmable logic controllers operating from 24VDC supplies with local 5V regulation. IC Role / Device Role / Timing Role: Supervises 5V rail, asserts RESET on brownout, triggers LOW LINE NMI at 4.74V (120mV above 4.62V threshold), and gates CE to SRAM during undervoltage. Use Value: Prevents firmware crash during line sags; enables deterministic recovery via NMI-driven diagnostics before full reset. |
Use Scenario: Embedded controller in portable ultrasound units with battery backup and strict FDA-required boot integrity. IC Role / Device Role / Timing Role: Generates 200ms power-on reset, monitors regulated 3.3V supply, and pulses WDPO to latch safety-critical subsystems on consecutive watchdog faults. Use Value: Guarantees µP starts in known state; WDPO+flip-flop architecture enforces hardware-level fail-safe shutdown per IEC 62304. |
| Telecom Remote Terminal Unit | Automotive Body Control Module |
Use Scenario: Outdoor RTU powered by solar-charged 12V battery with wide temperature swing (-20°C to +70°C). IC Role / Device Role / Timing Role: Provides reset at 4.62V threshold, uses MR for field-service reset button, and gates CE to EEPROM storing configuration data. Use Value: Ensures EEPROM write integrity during intermittent power; manual reset avoids firmware reflashing in remote deployments. |
Use Scenario: BCM in 12V automotive systems with transient-heavy environment and ASIL-B functional safety requirements. IC Role / Device Role / Timing Role: Monitors 5V LDO output, asserts LOW LINE at 4.74V for early warning, and disables CE during load-dump-induced brownouts. Use Value: Enables diagnostic logging before reset; CE gating prevents corrupted CAN message buffers during voltage dips. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX820LCSE | Guarantees ±2% reset/low-line threshold accuracy across full temperature range; MAX792LCSE specifies ±2% only at +25°C. | Preferred for high-accuracy applications like precision test equipment where threshold drift must be minimized. | Select MAX820LCSE when tighter thermal stability of reset thresholds is required; otherwise MAX792LCSE offers identical functionality at lower cost. |
| TPS3823-46DBVR | Single-output (RESET only), no low-line/NMI output, no WDPO, no CE gating; 4.63V threshold, 200ms delay, 3.5µA quiescent current. | Suitable for cost-sensitive designs needing basic reset only, without advanced supervision features. | Choose TPS3823-46DBVR only when low power (<5µA) and minimal feature set suffice; MAX792LCSE is required for NMI, watchdog, or memory gating. |
Compared with MAX820LCSE, MAX792LCSE trades guaranteed full-temperature threshold accuracy for lower cost while retaining identical pinout and core functions; versus TPS3823-46DBVR, it adds critical capabilities including low-line NMI, WDPO-based fault latching, and CE signal protection - essential for systems requiring memory integrity and layered fault response.
Availability
MAX792LCSE is available at Aetrix Electronics and suitable for industrial PLC controllers, medical diagnostic instruments, telecom remote terminal units, and automotive body control modules requiring stable component supply across extended product lifecycles.
Supply support for MAX792LCSE 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 and mixed-signal ICs for industrial, communications, and computing applications, with emphasis on reliability and integration.
The MAX792/MAX820 family targets microprocessor supervisory needs in systems without battery backup, delivering integrated reset, watchdog, low-line warning, and memory protection in a single 16-pin package.
FAQ
What is the exact reset threshold voltage for MAX792LCSE?
The MAX792LCSE has a nominal reset threshold voltage of 4.62V in internal threshold mode, with ±2% accuracy specified at +25°C. This value is factory-trimmed and corresponds to the 'L' suffix in the part number. The actual threshold remains stable across temperature, with normalized variation shown in Figure MAX792-6 of the datasheet.
Does MAX792LCSE support external reset threshold programming?
Yes, MAX792LCSE supports external programming mode by pulling the RESET IN/INT pin above 600mV, which disconnects internal comparators from the 1.30V reference and connects them to LLIN/REFOUT and RESET IN/INT pins. This allows custom reset and low-line thresholds using an external resistor divider, as detailed in Figure 4b of the datasheet.
How does the watchdog function behave on MAX792LCSE when VCC drops below the reset threshold?
When VCC falls below the 4.62V reset threshold, the watchdog function on MAX792LCSE is automatically disabled. WDO and WDPO remain high, and WDI transitions no longer reset the watchdog timer. This prevents spurious watchdog assertions during power-down sequences, ensuring clean system reset behavior.
What is the purpose of the CE IN and CE OUT pins on MAX792LCSE?
The CE IN and CE OUT pins on MAX792LCSE implement a transmission gate that passes chip-enable signals during normal operation but disables automatically during reset. This prevents erroneous memory writes during brownout conditions. If CE IN is low when reset asserts, CE OUT stays low for 15µs to complete the current write cycle - a key feature for protecting CMOS RAM and EEPROM.
Can MAX792LCSE generate a nonmaskable interrupt (NMI) signal?
Yes, MAX792LCSE generates a LOW LINE output that serves as a nonmaskable interrupt signal. In internal threshold mode, LOW LINE asserts 120mV above the 4.62V reset threshold (i.e., at ~4.74V), providing early warning of impending power failure. This signal is designed to connect directly to a µP's NMI pin for diagnostic logging before full reset occurs.
MAX792LCSE 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:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.62V
- Output:
- Push-Pull, Push-Pull
- Reset:
- Active High/Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
MAX792LCSE FAQ
1.How can I place an order for MAX792LCSE through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX792LCSE 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 MAX792LCSE reliable?
The price and inventory of MAX792LCSE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX792LCSE is usually 5 days.
3.What payment methods are accepted for MAX792LCSE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX792LCSE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX792LCSE?
MAX792LCSE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX792LCSE 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 MAX792LCSE?
For technical support, including MAX792LCSE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX792LCSE requirements.
6.How does Aetrix verify that MAX792LCSE is sourced from the original manufacturer or authorized distributors?
All MAX792LCSE 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 MAX792LCSE meets industry standards.
7.What is the process for return or replacement of MAX792LCSE?
All MAX792LCSE units undergo pre-shipment inspection (PSI). If there is an issue with MAX792LCSE, 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 MAX792LCSE part is unused and in its original packaging.
Return procedure for MAX792LCSE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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