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Analog Devices Inc./Maxim Integrated MAX820RCSE+
- Part No.:
- MAX820RCSE+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX820RCSE+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:794
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Product details
Overview
MAX820RCSE+ from Maxim Integrated is a microprocessor supervisory circuit with ±2% reset and low-line threshold accuracy, 200ms power-up reset delay, and integrated watchdog timer with 1.6s nominal timeout. It provides dual reset outputs (RESET/RESET), manual-reset input, chip-enable gating, and overvoltage detection - designed for critical power monitoring in embedded controllers and industrial computing systems.
For engineers reviewing the MAX820RCSE+ datasheet, MAX820RCSE+ pinout, MAX820RCSE+ application, or MAX820RCSE+ equivalent, this page delivers verified functional identity, exact pin roles, confirmed threshold voltages (4.55V–4.70V internal mode), watchdog timing behavior, CE propagation delay (10ns max), and real-world substitution guidance - all traceable to Maxim's official MAX792/MAX820 datasheet Rev. 4.
Technical Context
The MAX820RCSE+ implements dual independent comparators: one for reset assertion at VCC ≤ 4.62V (±2%), another for low-line warning at 120mV above that threshold. Its watchdog function monitors WDI transitions and asserts WDPO (pulse) then WDO (latched) after 1.6s timeout when no edge occurs.
It features on-board chip-enable transmission gating with 10ns max propagation delay, memory write-cycle completion support via CE OUT hold time, and selectable internal/external threshold programming via RESET IN/INT pin logic level (≤60mV for internal, ≥600mV for external). All outputs are guaranteed functional down to VCC = 1V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold Voltage | 4.62V nominal, ±2% accuracy - ensures precise brownout detection without calibration. |
| Power-Up Reset Delay | 200ms typical - guarantees µP initialization completes before code execution begins. |
| Watchdog Timeout Period | 1.6s nominal (SWT = VCC) - provides robust software fault detection for real-time control loops. |
| Chip-Enable Propagation Delay | 10ns maximum - enables safe interfacing with high-speed µPs and memory devices. |
| Supply Current | 70µA typical at +25°C - supports low-power battery-backed or energy-constrained systems. |
| Operating Voltage Range | 2.75V to 5.5V - compatible with 3.3V and 5V logic domains and mixed-supply designs. |
| Reset Output Validity | Guaranteed down to VCC = 1V - maintains system safety during deep undervoltage conditions. |
Pinout & Package
MAX820RCSE+ is housed in a 16-pin narrow SOIC (SO) package, 3.9mm width, RoHS-compliant lead-free construction (indicated by '+' suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 | RESET / RESET | Active-low and active-high complementary reset outputs; RESET sinks 1.6mA at 0.1V, valid 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-divider programming. |
| 5 | LLIN/REFOUT | In external mode: low-line comparator input; in internal mode: buffered 1.30V reference output. |
| 6 | OVO | Overvoltage comparator open-drain output - asserts low when OVI > 1.30V; uncommitted function. |
| 7 | OVI | Inverting input of overvoltage comparator - connect to voltage divider for overvoltage detection. |
| 8 | SWT | Watchdog timeout capacitor node - 1.6s default when tied to VCC; adjustable via external capacitor. |
| 9 | MR | Manual-reset input - internally pulled up; 12µs propagation delay; 25µs minimum pulse width. |
| 10 | LOW LINE | Active-low NMI output - asserts 120mV above reset threshold in internal mode; used for early brownout warning. |
| 11 | WDI | Watchdog input - edge-sensitive; resets timer on any transition (min 100ns pulse at VCC = 5V). |
| 12 | GND | Ground reference for all analog and digital circuitry; must be low-impedance connection. |
| 13 | CE OUT | Chip-enable output - gated pass-through of CE IN during normal operation; disabled during reset. |
| 14 | CE IN | Chip-enable input - series transmission gate input; high-impedance during reset assertion. |
| 15 | WDO | Watchdog output - latched low after timeout; returns high on next WDI transition; drives TTL loads. |
| 16 | WDPO | Watchdog-pulse output - 500µs–6ms pulse preceding WDO assertion by 70ns; clocks external latch. |
Key Features
| Feature | Design Value |
|---|---|
| ±2% reset/low-line threshold accuracy | Eliminates need for external trimming in precision power-monitoring applications like medical controllers. |
| Integrated chip-enable gating | Prevents memory corruption during brownout by disabling CE path within 15µs of reset assertion. |
| Pulsed watchdog output (WDPO) | Provides advance hardware warning of impending WDO assertion - enables two-fault shutdown via D flip-flop. |
| 10ns max CE propagation delay | Supports direct interface with fast µPs (e.g., ARM Cortex-M4, Renesas RX65N) without timing margin loss. |
| Reset validity to VCC = 1V | Ensures deterministic reset behavior even during catastrophic supply collapse - critical for safety-critical firmware. |
Applications
| Industrial PLC Controller | Medical Diagnostic Instrument |
|---|---|
Use Scenario: Power sequencing and runtime supervision in programmable logic controllers operating in harsh factory environments with fluctuating 24VDC supplies converted to 5V/3.3V rails. IC Role / Device Role / Timing Role: Supervisory IC providing brownout reset, manual reset, and watchdog-triggered fail-safe shutdown. Use Value: Prevents spurious I/O activation during undervoltage events and ensures deterministic recovery after power interruption. |
Use Scenario: Real-time monitoring of main and backup power rails in portable ultrasound or ECG units where firmware integrity is life-critical. IC Role / Device Role / Timing Role: Dual-threshold supervisor generating NMI (LOW LINE) at 4.74V and reset (RESET) at 4.62V for staged response. Use Value: Enables graceful data save before full reset, meeting IEC 62304 Class C software safety requirements. |
| Telecom Base Station Management | Automotive Infotainment Head Unit |
Use Scenario: Monitoring 12V-to-5V DC/DC converter output in remote radio head units exposed to wide temperature (-40°C to +85°C) and EMI. IC Role / Device Role / Timing Role: High-accuracy supervisor with external threshold programming to match custom rail tolerances. Use Value: Guarantees ±2% threshold stability across temperature - avoids false resets under thermal stress. |
Use Scenario: Power supervision for SoC and DDR memory in automotive infotainment systems with ISO 7637-2 pulse immunity requirements. IC Role / Device Role / Timing Role: Provides CE gating to protect RAM during cold-crank (4.5V min) and load-dump (30V transient) events. Use Value: Prevents memory corruption during engine start-up transients while maintaining AEC-Q100 compatibility via SOIC package. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX823TESA+ | Single-output (RESET only), no LOW LINE or WDPO; 5-pin SOT23; 4.63V threshold, ±2.5% accuracy. | Lacks NMI capability and watchdog pulse output - unsuitable for two-stage fault response or memory write protection. | Select when board space is constrained and only basic reset functionality is required. |
| TPS3808G33DBVR | TI part with 3.3V fixed threshold, ±0.5% accuracy, 200ms delay, no CE gating or WDPO; 6-pin SOT23. | No low-line warning, no manual reset, no chip-enable control - limited to simple reset-only use cases. | Choose for cost-sensitive 3.3V-only systems where advanced supervision features are unnecessary. |
Compared with MAX820RCSE+, MAX823TESA+ reduces feature count and package size but sacrifices NMI signaling and memory protection; TPS3808G33DBVR offers higher threshold accuracy at 3.3V but omits all multi-function capabilities - making MAX820RCSE+ the only choice for full-featured, programmable supervision in 5V industrial designs.
Availability
MAX820RCSE+ is available at Aetrix Electronics and suitable for industrial PLC controllers, medical diagnostic instruments, telecom base station management units, and automotive infotainment head units requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX820RCSE+ 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, communications, and computing markets.
The MAX820RCSE+ belongs to Maxim's microprocessor supervisory product line, engineered for deterministic power-up sequencing, brownout resilience, and hardware-level watchdog enforcement in mission-critical embedded systems.
FAQ
What is the exact reset threshold voltage for MAX820RCSE+?
The MAX820RCSE+ has a nominal reset threshold voltage of 4.62V in internal threshold mode, with ±2% accuracy over temperature and supply variations. This value is factory-trimmed and specified in the MAX792/MAX820 datasheet Rev. 4, Table "Reset Threshold Voltage-Internal Threshold Mode". The 'R' suffix in MAX820RCSE+ explicitly denotes the 4.62V variant.
Does MAX820RCSE+ support external reset threshold programming?
Yes, MAX820RCSE+ supports external threshold programming via the RESET IN/INT pin. When biased above 600mV, it disconnects internal references and allows user-defined reset and low-line thresholds using an external resistor divider connected to LLIN/REFOUT and RESET IN/INT - enabling customization for non-standard supply rails.
How does the watchdog function behave during power-down?
The watchdog function in MAX820RCSE+ is automatically disabled when VCC falls below the reset threshold voltage (4.62V). During power-down, WDI monitoring ceases, WDPO and WDO remain high, and no false timeouts occur - ensuring clean, predictable behavior without external disable circuitry.
What is the purpose of the LOW LINE output on MAX820RCSE+?
The LOW LINE output on MAX820RCSE+ is an active-low non-maskable interrupt (NMI) signal that asserts 120mV above the reset threshold (i.e., at ~4.74V). It provides early warning of impending brownout, allowing firmware to execute emergency save routines before full reset occurs - a key feature for data integrity in storage and control applications.
Can MAX820RCSE+ be used with 3.3V microprocessors?
Yes, MAX820RCSE+ operates from 2.75V to 5.5V and is fully compatible with 3.3V µPs. Its RESET output sources 1mA at VCC − 1V (≥2.3V at 3.3V), and all logic inputs (MR, WDI, CE IN) accept standard CMOS thresholds. The 4.62V reset threshold applies to 5V rails; for 3.3V systems, external programming mode is recommended to set appropriate thresholds.
MAX820RCSE+ 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:
- 2.61V
- 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
MAX820RCSE+ FAQ
1.How can I place an order for MAX820RCSE+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX820RCSE+ 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 MAX820RCSE+ reliable?
The price and inventory of MAX820RCSE+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX820RCSE+ is usually 5 days.
3.What payment methods are accepted for MAX820RCSE+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX820RCSE+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX820RCSE+?
MAX820RCSE+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX820RCSE+ 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 MAX820RCSE+?
For technical support, including MAX820RCSE+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX820RCSE+ requirements.
6.How does Aetrix verify that MAX820RCSE+ is sourced from the original manufacturer or authorized distributors?
All MAX820RCSE+ 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 MAX820RCSE+ meets industry standards.
7.What is the process for return or replacement of MAX820RCSE+?
All MAX820RCSE+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX820RCSE+, 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 MAX820RCSE+ part is unused and in its original packaging.
Return procedure for MAX820RCSE+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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