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Analog Devices Inc./Maxim Integrated MAX792RESE+
- Part No.:
- MAX792RESE+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX792RESE+.pdf
- Description:
- IC SUPERVISOR MPU 16-SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,582
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Product details
Overview
MAX792RESE+ 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 pulse output, and chip-enable gating for nonvolatile memory protection. It features a 2.61V internal reset threshold, guaranteed RESET validity down to VCC = 1V, and 200ms reset timeout. Used in embedded controllers and industrial instrumentation for reliable power-up/down and brownout recovery.
For engineers reviewing the MAX792RESE+ datasheet, MAX792RESE+ pinout, MAX792RESE+ application, or MAX792RESE+ equivalent, this page delivers verified functional identity, exact pin roles, confirmed reset/watchdog timing, memory write-cycle completion support, and real-world alternative part comparisons - all grounded in Maxim's official MAX792/MAX820 datasheet Rev. 4.
Technical Context
The MAX792RESE+ implements dual independent comparators: one for reset (threshold = 2.61V ±3%, hysteresis = 0.016×VTH) and one for low-line detection (120mV above reset threshold). Its watchdog uses an external capacitor on SWT to set timeout (1.6s nominal with SWT = VCC; k = 16.2 for VCC = 5V), and generates both WDPO (1.7ms pulse, 70ns before WDO) and WDO (latched low until next WDI transition).
It integrates a bidirectional CE transmission gate (10ns max propagation delay, on-resistance <200Ω) that disables during reset to prevent memory corruption, and supports both internal threshold mode (RESET IN/INT = GND) and external resistor-programmed thresholds. The device operates from 2.75V to 5.5V and guarantees functionality down to VCC = 1V for RESET assertion.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold Voltage | 2.61V (nominal); ensures reliable µP reset initiation when VCC drops below this level during brownout |
| Reset Timeout Period | 200ms (typical); guarantees sufficient hold time for µP initialization after power-up or recovery |
| Watchdog Timeout (SWT = VCC) | 1.6s (nominal); provides software fault detection window before hardware shutdown sequence begins |
| RESET Output Validity | Down to VCC = 1V; enables robust reset signaling even under severe undervoltage conditions |
| CE Propagation Delay | 10ns (max); allows safe integration with high-speed µP bus timing without violating setup/hold margins |
| Supply Current | 70µA (typical at +25°C); minimizes quiescent load on power rails in battery-backed or low-power systems |
| Low-Line Threshold Offset | +120mV above reset threshold; delivers advance NMI warning prior to reset assertion for graceful system response |
Pinout & Package
MAX792RESE+ is housed in a 16-pin narrow SOIC (SO) package, 3.9mm width, RoHS-compliant and lead-free (indicated by '+' suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 | RESET / RESET | Complementary active-low and active-high reset outputs; drive µP reset pin directly with guaranteed logic levels 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 resistor-programmed thresholds |
| 5 | LLIN/REFOUT | In external mode: low-line comparator input; in internal mode: buffered 1.30V reference output |
| 9 | MR | Manual reset input; internally pulled up; asserts reset when pulled below 1.30V (min 25µs pulse) |
| 10 | LOW LINE | Active-low NMI output; asserts 120mV above reset threshold to warn of impending power failure |
| 11 | WDI | Watchdog input; requires edge or pulse every <1.6s to prevent WDPO/WDO assertion |
| 14 | CE IN | Chip-enable input gate; passes signal to CE OUT only when reset is deasserted |
| 13 | CE OUT | Gated chip-enable output; blocks memory access during reset to prevent write corruption |
| 15, 16 | WDO / WDPO | Watchdog fault output (latched low) and watchdog pulse output (1.7ms, precedes WDO by 70ns) |
| 6, 7 | OVO / OVI | Uncommitted overvoltage comparator outputs/inputs; configurable for external overvoltage detection |
| 8 | SWT | Set watchdog timeout; connect to VCC for 1.6s default, or to GND via capacitor for adjustable timeout |
| 12 | GND | Ground reference for all internal circuits and output drivers |
Key Features
| Feature | Design Value |
|---|---|
| Two-stage power-fail warning | Independent low-line comparator triggers NMI 120mV above reset threshold, enabling preemptive system save/hibernate |
| Pulsed watchdog output (WDPO) | Generates 1.7ms logic-low pulse 70ns before WDO assertion, allowing external flip-flop latching for two-fault shutdown |
| Memory write-cycle completion | CE OUT remains low for 15µs after reset assertion if CE IN was low, ensuring ongoing RAM writes finish before disable |
| On-board CE signal gating | 10ns max propagation delay transmission gate prevents spurious memory writes during power transients |
| Voltage monitor for overvoltage warning | OVI/OVO pins form a standalone comparator (1.30V threshold) usable for supply overvoltage detection without affecting core functions |
Applications
| Industrial PLC Controllers | Medical Diagnostic Instruments |
|---|---|
Use Scenario: Power monitoring in programmable logic controllers deployed in factory automation environments with fluctuating 24VDC supplies. IC Role / Device Role / Timing Role: Supervisory IC generating precise reset and low-line NMI signals; provides 200ms reset hold time and 120mV early-warning margin. Use Value: Prevents firmware lockup during line sags by triggering controlled reboot or safe state entry before brownout causes data corruption. | Use Scenario: Critical power supervision in portable ultrasound or patient monitors where battery-backed operation demands fail-safe boot sequencing. IC Role / Device Role / Timing Role: Dual-role supervisor: RESET output ensures deterministic µP startup; WDPO/WDO pair enables software-watchdog-triggered hardware shutdown on missed heartbeat. Use Value: Guarantees RESET validity down to VCC = 1V, enabling reliable reset signaling even as backup battery discharges near end-of-life. |
| Telecom Remote Terminal Units | Energy Metering Gateways |
Use Scenario: Embedded communication modules in outdoor RTUs exposed to wide temperature (-40°C to +85°C) and voltage ripple. IC Role / Device Role / Timing Role: Power integrity guardian: monitors 3.3V/5V rails, asserts LOW LINE for NMI-based telemetry logging prior to reset, gates CE to protect flash memory. Use Value: 10ns CE propagation delay and ±3% reset threshold accuracy ensure compatibility with fast ARM Cortex-M MCUs and prevent memory corruption during grid-induced transients. | Use Scenario: Smart electricity meters requiring tamper-proof boot and secure firmware update handling under unstable AC-DC converted supplies. IC Role / Device Role / Timing Role: Memory protection supervisor: uses CE IN/CE OUT gating to block flash writes during undervoltage, while MR supports field-service reset via button. Use Value: Manual-reset input (MR) with 12µs propagation delay and 25µs minimum pulse width enables responsive, noise-immune field reset without external debouncing components. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX820RESE+ | ±2% reset/low-line threshold accuracy (vs. ±3% for MAX792RESE+); identical pinout, timing, and feature set | Better suited for precision power monitoring where tighter voltage tolerance is required (e.g., high-reliability medical or aerospace) | Select MAX820RESE+ when ±2% threshold accuracy is mandatory; otherwise MAX792RESE+ offers cost-optimized performance |
| TPS3808G33DBVR | Single reset output (no complementary RESET/RESET), no CE gating, no WDPO; 3.3V fixed threshold, 200ms timeout | Lacks low-line NMI, watchdog pulse, and memory gating - suitable only for basic reset-only applications | Choose TPS3808G33DBVR only if design requires only 3.3V reset supervision without advanced features; not a functional substitute for full MAX792RESE+ capability |
Compared with MAX820RESE+, the MAX792RESE+ trades ±2% threshold accuracy for lower cost while retaining identical watchdog, CE gating, and low-line functionality; compared with TPS3808G33DBVR, it delivers comprehensive supervision (dual reset, NMI, watchdog pulse, memory protection) at the expense of higher BOM count and design complexity.
Availability
MAX792RESE+ is available at Aetrix Electronics and suitable for industrial PLC controllers, medical diagnostic instruments, telecom remote terminal units, and energy metering gateways requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX792RESE+ 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 industrial, automotive, communications, and computing applications.
The MAX792/MAX820 product line delivers integrated microprocessor supervision with reset, watchdog, low-line warning, and memory protection - engineered specifically for reliability-critical embedded systems where power integrity and firmware robustness are paramount.
FAQ
What is the exact reset threshold voltage for MAX792RESE+?
The MAX792RESE+ has a nominal reset threshold voltage of 2.61V, with ±3% accuracy over temperature. This value is factory-trimmed and corresponds to the 'R' suffix in the part number. The device guarantees RESET assertion when VCC falls below this threshold and maintains valid RESET output down to VCC = 1V, making MAX792RESE+ suitable for deep undervoltage recovery scenarios.
Does MAX792RESE+ support external programming of reset and low-line thresholds?
Yes, MAX792RESE+ supports external programming via the RESET IN/INT and LLIN/REFOUT pins. When RESET IN/INT is biased above 600mV, the internal voltage divider disconnects and allows an external resistor network to set custom reset and low-line thresholds. The MAX792RESE+ datasheet provides exact equations for calculating R1–R3 values based on desired thresholds and maximum divider current.
How does the watchdog function work on MAX792RESE+?
The MAX792RESE+ watchdog monitors the WDI pin: if no edge or pulse occurs within the timeout period (1.6s nominal with SWT = VCC), WDPO pulses low for 1.7ms, followed 70ns later by WDO going low. WDO remains latched low until the next WDI transition. This dual-output structure enables both immediate fault notification (WDPO) and hardware shutdown control (WDO), a key capability of the MAX792RESE+ architecture.
What is the purpose of the CE IN and CE OUT pins on MAX792RESE+?
The CE IN and CE OUT pins on MAX792RESE+ implement a transmission gate that blocks chip-enable signals to nonvolatile memory during reset. When reset is asserted, CE OUT is forced high-impedance or pulled up, preventing spurious writes. If CE IN is low at reset assertion, CE OUT stays low for 15µs to complete the current memory write cycle - a critical feature for data integrity in the MAX792RESE+ design.
Can MAX792RESE+ be used with 3.3V microcontrollers?
Yes, MAX792RESE+ operates from 2.75V to 5.5V and is fully compatible with 3.3V systems. Its reset threshold variants include 3.06V (T) and 2.91V (S); the 'R' version (2.61V) is appropriate for 3.3V rails where margin is needed below nominal voltage. All outputs (RESET, WDO, LOW LINE) are CMOS-compatible and interface directly with 3.3V µP I/O, and the 10ns CE propagation delay ensures timing compliance.
MAX792RESE+ 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:
- 2.61V
- 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
MAX792RESE+ FAQ
1.How can I place an order for MAX792RESE+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX792RESE+ 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 MAX792RESE+ reliable?
The price and inventory of MAX792RESE+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX792RESE+ is usually 5 days.
3.What payment methods are accepted for MAX792RESE+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX792RESE+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX792RESE+?
MAX792RESE+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX792RESE+ 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 MAX792RESE+?
For technical support, including MAX792RESE+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX792RESE+ requirements.
6.How does Aetrix verify that MAX792RESE+ is sourced from the original manufacturer or authorized distributors?
All MAX792RESE+ 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 MAX792RESE+ meets industry standards.
7.What is the process for return or replacement of MAX792RESE+?
All MAX792RESE+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX792RESE+, 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 MAX792RESE+ part is unused and in its original packaging.
Return procedure for MAX792RESE+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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