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Analog Devices Inc./Maxim Integrated MAX792LESE+
- Part No.:
- MAX792LESE+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- -
- Datasheet:
-
MAX792LESE+.pdf
- Description:
- IC SUPERVISOR MPU 16-SOIC
- Quantity:
- Payment:
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Inventory:4,068
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Product details
Overview
MAX792LESE+ 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 internal or externally programmed reset/low-line thresholds. Used in embedded controllers and industrial instrumentation requiring reliable power-up/down sequencing.
For engineers reviewing the MAX792LESE+ datasheet, MAX792LESE+ pinout, MAX792LESE+ application, or MAX792LESE+ equivalent, key selection considerations include its 4.62V nominal reset threshold (L-suffix), 200ms reset timeout, ±2% threshold accuracy in external programming mode, watchdog timeout configurability via SWT capacitor, and integrated CE signal gating with 10ns max propagation delay.
Technical Context
The MAX792LESE+ implements dual independent comparators: one for reset assertion (with hysteresis) and another for low-line warning, both referencing either an internal 1.30V bandgap or user-defined thresholds via external resistor divider. Its watchdog function monitors WDI transitions with a nominal 1.6s timeout (adjustable via SWT capacitor), generating WDPO (1.7ms pulse) followed by WDO (latched low) on fault.
Chip-enable gating uses a transmission gate between CE IN and CE OUT, disabled during reset to prevent memory corruption; propagation delay is guaranteed ≤10ns. The device operates from 2.75V to 5.5V, with RESET valid down to 1V and MR threshold fixed at 1.30V typical, supporting direct pushbutton interface without external pull-up.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold Voltage | 4.62V nominal (L-suffix); factory-trimmed for ±2% accuracy in external programming mode - ensures precise brownout detection aligned with 5V system rails. |
| Reset Timeout Period | 200ms typical after VCC rise or MR release - provides sufficient hold time for µP initialization and peripheral stabilization. |
| Watchdog Timeout (SWT = VCC) | 1.6s nominal - configurable via external capacitor on SWT pin to adapt to software execution timing margins. |
| CE Propagation Delay | ≤10ns max - enables use with high-speed µPs without compromising memory write-cycle completion integrity. |
| Supply Current | 70µA typical at +25°C, VCC = 5V - supports low-power operation in battery-backed or energy-constrained systems. |
| Operating Voltage Range | 2.75V to 5.5V - compatible with both 3.3V and 5V logic domains while maintaining full supervisory functionality. |
| RESET Validity Limit | Guaranteed down to VCC = 1V - ensures deterministic reset behavior during deep brownout or controlled power-down sequences. |
Pinout & Package
MAX792LESE+ is housed in a 16-pin narrow SO (Small Outline) package, 3.9mm width, RoHS-compliant lead-free construction (+ suffix). Pin count, thermal profile, and footprint match industry-standard 16-SOIC.
| 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, timers, and output drivers. |
| 4 | RESET IN/INT | Mode select: ≤60mV → internal threshold mode; ≥600mV → external programming mode using resistor divider. |
| 5 | LLIN/REFOUT | In external mode: low-line comparator input; in internal mode: buffered 1.30V reference output. |
| 9 | MR | Manual-reset input with 1.30V threshold and internal VCC pull-up - accepts direct pushbutton connection. |
| 10 | LOW LINE | Active-low NMI output asserted 120mV above reset threshold - provides early warning before reset activation. |
| 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, references, and output stages. |
| 13 | CE OUT | Active-low chip-enable output gated by CE IN and reset state - blocks memory access during under-voltage. |
| 14 | CE IN | Chip-enable input; transmission gate enabled only when reset is deasserted - prevents partial writes. |
| 15, 16 | WDO / WDPO | WDPO pulses low 1.7ms before WDO asserts; WDO latches low until next WDI transition - enables hardware shutdown sequencing. |
Key Features
| Feature | Design Value |
|---|---|
| Two-stage power-fail monitoring | Independent low-line comparator asserts 120mV above reset threshold - delivers early NMI warning before system reset occurs. |
| Pulsed watchdog fault indication | WDPO generates 1.7ms low pulse 70ns before WDO assertion - allows external logic (e.g., D flip-flop) to detect two consecutive faults for hardware shutdown. |
| Programmable reset/low-line thresholds | External resistor divider on RESET IN/INT and LLIN/REFOUT enables custom voltage trip points - supports nonstandard supply rails or aging compensation. |
| Chip-enable signal gating | 10ns max CE IN → CE OUT propagation delay with automatic disable during reset - prevents corrupted writes to CMOS RAM during brownout. |
| Guaranteed reset validity at low VCC | RESET remains functional down to VCC = 1V - ensures deterministic behavior even during deep discharge or controlled power ramp-down. |
Applications
| Industrial PLC Controllers | Medical Diagnostic Instruments |
|---|---|
Use Scenario: Power supervision in programmable logic controllers operating in electrically noisy factory environments with fluctuating 24VDC-derived 5V rails. IC Role / Device Role / Timing Role: Generates synchronized RESET and LOW LINE signals to halt CPU execution and trigger NMI-based diagnostics before brownout-induced corruption. Use Value: Prevents spurious I/O state changes and firmware lockup by enforcing 200ms reset hold time and early 120mV-margin low-line warning. |
Use Scenario: Supervision of microcontroller-based imaging subsystems in portable ultrasound devices powered by Li-ion batteries. IC Role / Device Role / Timing Role: Monitors 3.3V domain voltage decay; asserts RESET at 3.06V (T-suffix variant) and LOW LINE at 3.18V to initiate safe data save and shutdown sequence. Use Value: Guarantees RESET validity down to 1V - critical for preserving calibration data during final battery discharge phase. |
| Telecom Base Station Management | Automotive Body Control Modules |
Use Scenario: Monitoring redundant 5V power supplies in remote radio head units exposed to wide temperature swings (-40°C to +85°C). IC Role / Device Role / Timing Role: Provides watchdog supervision of FPGA configuration state via WDI; WDPO/WDO pair enables fail-safe reboot on firmware hang without host intervention. Use Value: Configurable watchdog timeout (via SWT capacitor) adapts to variable FPGA boot times across temperature and process corners. |
Use Scenario: Power integrity monitoring in CAN-connected body control modules where ECU must survive load-dump transients and cold-crank conditions. IC Role / Device Role / Timing Role: Uses internal threshold mode with 4.62V reset (L-suffix) and manual reset (MR) tied to ignition switch - ensures clean restart after voltage sag. Use Value: 10ns CE gating prevents EEPROM write corruption during 12V-to-5V regulator dropout events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX820LESE+ | Same pinout and function; guarantees ±2% reset/low-line threshold accuracy in external programming mode (vs. ±3% typical for MAX792). | Preferred where high-precision voltage monitoring is required across temperature, e.g., metrology-grade instruments. | Select MAX820LESE+ when absolute threshold tolerance is critical; otherwise MAX792LESE+ offers cost-effective performance for general-purpose control. |
| TPS3823MPDBVR | Single-output (active-low RESET only), no WDPO/WDI, no CE gating; 4.63V threshold, 200ms delay; SOT-23-5 package. | Suitable for space-constrained designs needing basic reset only, without watchdog or memory protection features. | Choose TPS3823MPDBVR only if watchdog, low-line warning, and CE gating are unnecessary - it lacks functional equivalence in supervisory scope. |
Compared with MAX820LESE+, MAX792LESE+ trades guaranteed ±2% threshold accuracy for lower cost while retaining identical pinout and feature set; versus TPS3823MPDBVR, it delivers full supervisory capability (dual reset, watchdog, CE gating) in a larger but functionally complete 16-SO package.
Availability
MAX792LESE+ is available at Aetrix Electronics and suitable for industrial automation, medical instrumentation, and telecom infrastructure applications requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant sourcing.
Supply support for MAX792LESE+ 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 power management, sensing, and connectivity in demanding industrial and automotive environments.
The MAX792/MAX820 product line was engineered specifically for microprocessor supervisory functions - integrating reset generation, watchdog monitoring, low-line warning, and memory write protection into a single 16-pin IC for space- and reliability-critical embedded systems.
FAQ
What is the reset threshold voltage of the MAX792LESE+?
The MAX792LESE+ has a nominal reset threshold voltage of 4.62V, indicated by the 'L' suffix in the part number. This value is factory-trimmed and guaranteed over temperature in internal threshold mode. In external programming mode, the threshold is set by an external resistor divider referenced to the internal 1.30V bandgap, with ±2% accuracy specified for the MAX820 variant.
Does the MAX792LESE+ support watchdog functionality?
Yes, the MAX792LESE+ includes a fully integrated watchdog timer. It monitors the WDI pin for transitions and asserts WDPO (a 1.7ms pulse) followed by WDO (latched low) if no activity occurs within the timeout period. The default timeout is 1.6s when SWT is tied to VCC, but it can be adjusted using an external capacitor on the SWT pin.
How does the chip-enable (CE) gating function work on the MAX792LESE+?
The MAX792LESE+ provides CE signal gating via a transmission gate between CE IN and CE OUT. When reset is deasserted, CE IN passes directly to CE OUT with ≤10ns propagation delay. When reset is asserted, the gate disables, isolating CE IN and pulling CE OUT high. If CE IN is low at reset assertion, CE OUT remains low for 15µs to complete the current memory write cycle.
Can the MAX792LESE+ operate with supply voltages below 3V?
Yes, the MAX792LESE+ operates from 2.75V to 5.5V. Crucially, its RESET output remains guaranteed functional down to VCC = 1V, enabling reliable reset assertion during deep brownout or controlled power-down sequences. However, the watchdog function is disabled when VCC falls below the reset threshold.
What is the purpose of the LLIN/REFOUT pin on the MAX792LESE+?
The LLIN/REFOUT pin serves dual roles: in internal threshold mode (RESET IN/INT ≤60mV), it outputs a buffered 1.30V reference; in external programming mode (RESET IN/INT ≥600mV), it becomes the input to the low-line comparator. This flexibility allows either factory-set or user-defined low-line detection thresholds, with the low-line output asserting 120mV above the reset threshold in internal mode.
MAX792LESE+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- -
- Number of Voltages Monitored:
- -
- Voltage - Threshold:
- -
- Output:
- -
- Reset:
- -
- Reset Timeout:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
MAX792LESE+ FAQ
1.How can I place an order for MAX792LESE+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX792LESE+ 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 MAX792LESE+ reliable?
The price and inventory of MAX792LESE+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX792LESE+ is usually 5 days.
3.What payment methods are accepted for MAX792LESE+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX792LESE+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX792LESE+?
MAX792LESE+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX792LESE+ 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 MAX792LESE+?
For technical support, including MAX792LESE+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX792LESE+ requirements.
6.How does Aetrix verify that MAX792LESE+ is sourced from the original manufacturer or authorized distributors?
All MAX792LESE+ 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 MAX792LESE+ meets industry standards.
7.What is the process for return or replacement of MAX792LESE+?
All MAX792LESE+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX792LESE+, 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 MAX792LESE+ part is unused and in its original packaging.
Return procedure for MAX792LESE+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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