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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:3,802
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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 timeout monitoring, and chip-enable signal gating for nonvolatile memory protection. It guarantees valid RESET output down to VCC = 1V and supports internal or externally programmable reset/low-line thresholds. Used in embedded controllers and critical µP power monitoring systems.
For engineers reviewing the MAX792LCSE+ datasheet, MAX792LCSE+ pinout, MAX792LCSE+ application, or MAX792LCSE+ equivalent, key selection considerations include its 4.62V nominal reset threshold (L-suffix), 200ms reset timeout, ±2% threshold accuracy in external programming mode, 10ns max CE propagation delay, and integrated watchdog-pulse output (WDPO) with 70ns advance warning before WDO assertion.
Technical Context
The MAX792LCSE+ implements dual independent comparators: one for reset generation (with hysteresis) and another for low-line detection, both configurable via RESET IN/INT pin state. Its watchdog timer uses an RC-controlled timeout (default 1.6s via SWT tied to VCC) and delivers fault indication through both pulsed WDPO and latched WDO outputs.
Chip-enable gating operates as a transmission gate between CE IN and CE OUT, disabled during reset assertion to prevent memory corruption; it features 10ns max propagation delay and 15µs hold time on CE OUT when CE IN is low at reset onset. The device supports both internal fixed-threshold operation (1.30V reference) and external resistor-divider programming of reset and low-line thresholds.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold Voltage | 4.62V nominal (L-suffix), guaranteed valid down to VCC = 1V for reliable brownout detection in low-voltage scenarios |
| Reset Timeout Period | 200ms typical after VCC rise or MR release - ensures stable µP initialization before code execution |
| Watchdog Timeout | 1.6s nominal (SWT = VCC); adjustable via capacitor on SWT pin - enables flexible software fault detection timing |
| CE Propagation Delay | 10ns maximum - preserves timing integrity for high-speed memory access during normal operation |
| Low-Line Threshold Offset | 120mV above reset threshold - provides early NMI warning before reset assertion during supply droop |
| Supply Current | 70µA typical at +25°C - enables low-power system supervision without significant load on regulated rail |
| Operating Temperature | 0°C to +70°C - suitable for commercial-grade industrial and computing applications |
Pinout & Package
MAX792LCSE+ is housed in a 16-pin narrow SOIC (Small Outline Integrated Circuit) package, 3.9mm width, RoHS-compliant lead-free construction (+ suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 | RESET / RESET | Complementary active-low and active-high reset outputs; RESET guaranteed functional down to VCC = 1V |
| 3 | VCC | Main supply input (2.75V–5.5V); powers all internal circuits and drives pull-ups |
| 4 | RESET IN/INT | Mode select: ≤60mV → internal 1.30V reference; ≥600mV → external resistor-divider programming |
| 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 - uncommitted, no effect on other functions |
| 7 | OVI | Inverting input to overvoltage comparator - compare against 1.30V internal reference |
| 8 | SWT | Watchdog timeout control: 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 12µs propagation delay - accepts pushbutton or logic signals |
| 10 | LOW LINE | Active-low NMI output asserted 120mV above reset threshold - enables pre-reset system alerting |
| 11 | WDI | Watchdog input - transition resets timer; static high/low > timeout triggers WDPO/WDO assertion |
| 12 | GND | Ground reference for all analog and digital circuitry |
| 13 | CE OUT | Chip-enable output gated by CE IN and reset state - blocks memory writes during under-voltage |
| 14 | CE IN | Chip-enable input transmission gate control - high-impedance during reset to isolate memory bus |
| 15 | WDO | Watchdog fault output - latched low until next WDI transition; used for hardware shutdown or MR triggering |
| 16 | WDPO | Watchdog pulse output - 500µs–6ms low pulse preceding WDO by 70ns; enables two-fault latching via D flip-flop |
Key Features
| Feature | Design Value |
|---|---|
| Two-stage power-fail warning | Independent low-line comparator asserts LOW LINE 120mV above reset threshold - enables preemptive NMI before system reset |
| Pulsed watchdog output (WDPO) | 70ns-advanced, 500µs–6ms pulse before WDO - allows implementation of two-consecutive-fault latching for fail-safe shutdown |
| On-board chip-enable gating | 10ns max CE IN → CE OUT propagation delay with 15µs hold time - prevents partial memory writes during power-down |
| Memory write-cycle completion support | CE OUT remains low for 15µs after reset assertion if CE IN was low - ensures ongoing RAM/EEPROM write completes |
| Voltage monitor for overvoltage warning | OVI/OVO pair forms standalone 1.30V-referenced comparator - detect supply overvoltage without affecting supervision logic |
Applications
| Industrial Controller Power Monitoring | Embedded Computing System Reset Management |
|---|---|
|
Use Scenario: PLC or motion controller operating from 5V rail with battery-backed CMOS RAM requiring deterministic reset behavior during line sags. IC Role / Device Role / Timing Role: Supervisory IC generating synchronized RESET/LOW LINE signals, gating CE to protect RAM, and monitoring WDI for firmware hang detection. Use Value: Prevents corrupted configuration data during brownout via 120mV low-line offset and ensures µP boots only after 200ms stable VCC. |
Use Scenario: Network appliance with Intel x86-compatible processor and SPI flash, needing robust power-on reset and watchdog recovery. IC Role / Device Role / Timing Role: Primary reset supervisor asserting RESET and RESET, providing WDPO-triggered D-flip-flop latch for double-fault shutdown, and isolating memory CE during undervoltage. Use Value: Eliminates need for discrete reset IC + external watchdog timer + CE gate logic - reduces BOM count and PCB area. |
| Intelligent Instrumentation Power Integrity | Critical µP-Based Data Logger |
|
Use Scenario: Portable multimeter with real-time clock and EEPROM storing calibration coefficients, powered by Li-ion battery with 3.3V LDO. IC Role / Device Role / Timing Role: Supervisory circuit using internal 3.06V threshold variant (not this part) - but MAX792LCSE+ supports same architecture with 4.62V threshold for higher-rail instruments. Use Value: Guarantees RESET validity down to VCC = 1V - maintains safe reset state even during deep battery discharge or LDO dropout. |
Use Scenario: Environmental sensor node logging to FRAM, requiring guaranteed write completion before power loss. IC Role / Device Role / Timing Role: CE gating IC holding CE OUT low for 15µs after reset onset while CE IN is low - ensures final FRAM write finishes before reset takes effect. Use Value: Prevents partial writes corrupting nonvolatile storage - eliminates need for software wear-leveling or CRC rollback schemes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX792MCSE+ | 4.37V nominal reset threshold (M-suffix), otherwise identical electrical and functional specification | Suitable for 4.5V nominal supply rails where tighter margin below 4.62V is required | Select MAX792MCSE+ when system VCC nominal is 4.5V and 130mV headroom above reset threshold is preferred |
| MAX792TCSE+ | 3.06V nominal reset threshold (T-suffix), same pinout and feature set | Designed for 3.3V systems with lower supply tolerance; not drop-in for 5V applications | Choose MAX792TCSE+ only for 3.3V designs requiring factory-trimmed 3.06V reset point and full feature compatibility |
Compared with MAX792LCSE+, the M-suffix variant offers 250mV lower reset threshold for tighter 4.5V rail supervision, while the T-suffix variant shifts threshold to 3.06V for 3.3V systems - all share identical watchdog, CE gating, and low-line functionality, enabling family-based design reuse across voltage domains.
Availability
MAX792LCSE+ is available at Aetrix Electronics and suitable for industrial controller power monitoring, embedded computing system reset management, intelligent instrumentation power integrity, and critical µP-based data logger applications requiring stable component supply and long-term lifecycle support.
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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, computing, and communications markets.
The MAX792 series belongs to Maxim's microprocessor supervisory product line, designed specifically to consolidate reset generation, watchdog monitoring, memory write protection, and power-fail warning into a single IC for space-constrained embedded systems.
FAQ
What is the reset threshold voltage of the MAX792LCSE+?
The MAX792LCSE+ has a nominal reset threshold voltage of 4.62V, indicated by the 'L' suffix in the part number. This value is factory-trimmed and specified with ±2% accuracy in external programming mode. The device guarantees valid RESET output down to VCC = 1V, making it suitable for brownout detection in systems with wide supply variation. Internal reference stability is confirmed across 0°C to +70°C operating range.
How does the MAX792LCSE+ implement two-stage power-fail warning?
The MAX792LCSE+ implements two-stage power-fail warning using separate comparators: the reset comparator triggers RESET at the 4.62V threshold, while the low-line comparator asserts LOW LINE at 4.74V (120mV above reset threshold). This 120mV offset provides early non-maskable interrupt (NMI) signaling before full reset occurs, allowing firmware to save state or initiate graceful shutdown. Both comparators share the same internal 1.30V reference in internal threshold mode.
Can the watchdog timeout period of the MAX792LCSE+ be adjusted?
Yes, the watchdog timeout period of the MAX792LCSE+ is adjustable via the SWT pin. With SWT tied to VCC, the default timeout is 1.6 seconds. Connecting an external capacitor from SWT to GND sets an alternative timeout: 27 × C (nF) ms at VCC = 3V, or 16.2 × C (nF) ms at VCC = 5V. Capacitor values must exceed 4.7nF; floating or grounded SWT is prohibited. The MAX792LCSE+ datasheet confirms this relationship across temperature and supply voltage.
What is the function of the CE IN and CE OUT pins on the MAX792LCSE+?
The CE IN and CE OUT pins on the MAX792LCSE+ form a transmission gate that controls chip-enable signals to nonvolatile memory. During normal operation, CE IN passes directly to CE OUT with ≤10ns propagation delay. When reset is asserted, the gate disables - CE IN becomes high-impedance and CE OUT is pulled up. If CE IN is low at reset onset, CE OUT remains low for 15µs to complete the current memory write cycle, preventing data corruption during power transitions.
Does the MAX792LCSE+ support external programming of reset and low-line thresholds?
Yes, the MAX792LCSE+ supports external programming of both reset and low-line thresholds via the RESET IN/INT and LLIN/REFOUT pins. Pulling RESET IN/INT above 600mV disconnects internal references and connects external resistor dividers to both comparators. Equations in the MAX792/MAX820 datasheet define R1–R3 values based on desired thresholds and maximum divider current (e.g., 5µA). Accuracy depends on resistor tolerance and reference drift; MAX820 variants offer tighter ±2% spec in this mode.
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:
- Active
- 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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