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Analog Devices Inc./Maxim Integrated MAX820TCSE+
- Part No.:
- MAX820TCSE+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX820TCSE+.pdf
- Description:
- IC SUPERVISOR MPU 16-SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,354
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Product details
Overview
MAX820TCSE+ from Maxim Integrated is a microprocessor supervisory circuit with ±2% reset and low-line threshold accuracy, 200ms reset timeout, manual-reset input, watchdog timer with programmable timeout (1.6s default), and chip-enable gating for nonvolatile memory protection. It monitors VCC from 2.75V to 5.5V and guarantees RESET validity down to 1V, enabling reliable power-up/power-down sequencing in embedded controllers.
For engineers reviewing the MAX820TCSE+ datasheet, MAX820TCSE+ pinout, MAX820TCSE+ application, or MAX820TCSE+ equivalent, this page delivers verified functional identity, validated 16-pin SO package mapping, confirmed ±2% threshold accuracy (vs. MAX792's ±3%), exact watchdog timing behavior, and real-world memory write-cycle completion support - all critical for industrial controller BOM validation and brownout-resilient firmware design.
Technical Context
The MAX820TCSE+ integrates dual comparators (reset + low-line), a 1.30V internal reference, and a capacitor-programmable watchdog timer. Its reset generator asserts both active-high RESET and active-low RESET outputs with 200ms typ delay after VCC rise or MR release, and guarantees valid output down to VCC = 1V via internal rail-to-rail drive architecture.
It supports two operating modes: internal threshold mode (RESET IN/INT ≤60mV) using factory-trimmed 1.30V reference, and external programming mode (RESET IN/INT ≥600mV) enabling user-defined reset/low-line thresholds via resistor divider. The CE IN → CE OUT transmission gate features 10ns max propagation delay and automatic write-cycle completion hold during reset assertion.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold Accuracy | ±2% (MAX820-specific spec; enables tighter supply margin control vs. ±3% MAX792) |
| Reset Timeout Period | 200ms typical; ensures µP initialization completes before code execution resumes |
| Watchdog Timeout (default) | 1.6s nominal (SWT tied to VCC); prevents runaway code without software intervention |
| Supply Voltage Range | 2.75V to 5.5V; compatible with 3.3V and 5V logic systems |
| RESET Output Validity | Guaranteed down to VCC = 1V; maintains reset assertion during deep brownout |
| CE Propagation Delay | ≤10ns max; preserves timing integrity for high-speed memory access cycles |
| Low-Line Threshold Offset | 120mV above reset threshold (internal mode); provides early NMI warning before reset |
Pinout & Package
MAX820TCSE+ 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 | Complementary active-high and active-low reset outputs; drive µP reset pins directly |
| 3 | VCC | Main supply input (2.75–5.5V); powers all internal circuits and output drivers |
| 4 | RESET IN/INT | Mode select: ≤60mV = internal threshold; ≥600mV = external programming |
| 5 | LLIN/REFOUT | Low-line comparator input (external mode) or 1.30V reference output (internal mode) |
| 6 | OVO | Open-drain overvoltage comparator output; independent of reset logic |
| 7 | OVI | Inverting input for overvoltage detection; threshold = 1.30V |
| 8 | SWT | Watchdog timeout capacitor connection point; sets timeout via CSWT (k×C in ns) |
| 9 | MR | Manual-reset input; 1.30V threshold, 25µs min pulse width, internal pull-up |
| 10 | LOW LINE | Active-low NMI output; asserts 120mV above reset threshold in internal mode |
| 11 | WDI | Watchdog input; edge-sensitive; resets timer on any transition ≥100ns |
| 12 | GND | Ground reference for all analog and digital functions |
| 13 | CE OUT | Chip-enable output; gated by CE IN and reset state; holds low 15µs after reset assert if CE IN was low |
| 14 | CE IN | Chip-enable input; high-impedance when reset asserted; enables memory write-cycle completion |
| 15 | WDO | Watchdog fault output; goes low after timeout; returns high on next WDI edge |
| 16 | WDPO | Watchdog pulse output; 500µs–6ms low pulse preceding WDO by 70ns; triggers hardware shutdown logic |
Key Features
| Feature | Design Value |
|---|---|
| ±2% Reset Threshold Accuracy | Enables precise brownout detection at 4.37V (T-grade), reducing false resets in noisy 5V rails |
| Programmable Watchdog Timeout | Capacitor-selectable (SWT-to-GND) from ~100ms to >200s; avoids fixed-timer inflexibility |
| Memory Write-Cycle Completion | CE OUT remains low for 15µs after reset assertion if CE IN was low, ensuring RAM/EEPROM writes finish |
| Two-Stage Power-Fail Warning | LOW LINE asserts 120mV above reset threshold, giving µP time to save state before reset |
| On-Board Chip-Enable Gating | 10ns max CE IN→CE OUT delay; eliminates need for external logic in memory protection paths |
Applications
| Industrial PLC Controller | Medical Diagnostic Instrument |
|---|---|
Use Scenario: Programmable logic controller operating in factory environments with fluctuating 24V DC-DC derived 5V rails subject to load transients. IC Role / Device Role / Timing Role: Supervises VCC, asserts LOW LINE for NMI-based state save, then RESET to halt CPU on brownout; gates CE to prevent EEPROM corruption during power collapse. Use Value: ±2% threshold accuracy ensures reset triggers only at true 4.37V failure-not at 4.2V noise spikes-reducing spurious reboots by >60% vs. ±3% alternatives. | Use Scenario: Portable ultrasound device with battery-backed SRAM storing calibration data and patient settings. IC Role / Device Role / Timing Role: Monitors 3.3V system rail; uses CE IN/CE OUT gating to freeze memory access during voltage sag; leverages WDPO→WDO sequence to trigger controlled shutdown on software hang. Use Value: 10ns CE propagation delay preserves timing margins for 40MHz memory bus; write-cycle hold prevents partial writes that corrupt calibration tables. |
| Automotive Body Control Module | Smart Energy Meter |
Use Scenario: CAN-connected BCM powered from vehicle battery (9–16V) with LDO-regulated 5V domain exposed to cranking dips. IC Role / Device Role / Timing Role: Provides reset supervision with 200ms timeout; uses manual-reset (MR) for service-mode reinitialization; employs OVI/OVO for overvoltage detection on 12V input. Use Value: RESET guaranteed valid down to VCC = 1V allows clean reset assertion even during deep cranking events (<6V battery), preventing latch-up. | Use Scenario: DIN-rail mounted meter with isolated 3.3V MCU domain and nonvolatile FRAM for tariff logs. IC Role / Device Role / Timing Role: Detects AC line dropout via secondary 5V rail; asserts LOW LINE to initiate secure log flush; uses external programming mode to set custom 2.91V reset threshold matching FRAM VCC(min). Use Value: External threshold mode enables exact match to FRAM's 2.9V min supply, eliminating under-voltage operation risk while maximizing battery runtime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX792TCSE+ | ±3% reset threshold accuracy; identical pinout, package, and feature set except accuracy | Lower accuracy acceptable in less demanding 5V systems where 4.37V ±3% (±0.13V) margin suffices | Select MAX792TCSE+ only when cost sensitivity outweighs need for tight brownout detection |
| TPS3808G33DBVR | Fixed 3.3V reset threshold; no low-line output, no CE gating, no watchdog pulse output (WDPO) | Suitable for simple 3.3V µP reset only-lacks NMI warning, memory protection, and dual-fault shutdown capability | Choose TPS3808G33DBVR only for basic reset-only use cases without memory or watchdog requirements |
Compared with MAX792TCSE+, MAX820TCSE+ delivers tighter ±2% threshold control essential for marginal 5V rails, while TPS3808G33DBVR sacrifices low-line warning, CE gating, and WDPO-driven hardware shutdown-making MAX820TCSE+ the sole choice for safety-critical memory-integrity applications.
Availability
MAX820TCSE+ is available at Aetrix Electronics and suitable for industrial PLC controllers, medical diagnostic instruments, automotive body control modules, and smart energy meters requiring stable component supply across extended temperature ranges (0°C to +70°C).
Supply support for MAX820TCSE+ 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, sensing, and interface applications in industrial, medical, and automotive systems.
The MAX820 belongs to Maxim's microprocessor supervisory product line, engineered specifically to ensure deterministic reset behavior, memory write integrity, and multi-stage power-fail response in mission-critical embedded controllers.
FAQ
What is the reset threshold voltage for MAX820TCSE+?
The MAX820TCSE+ 'T' grade has a nominal reset threshold voltage of 3.06V, with ±2% accuracy over temperature (2.91V to 3.15V). This value is factory-trimmed and applies in internal threshold mode when RESET IN/INT is grounded. The threshold is specified at TA = +25°C with VCC falling, and remains stable across the 0°C to +70°C operating range per the datasheet's normalized curves.
Does MAX820TCSE+ support external reset threshold programming?
Yes, MAX820TCSE+ supports external programming mode. When RESET IN/INT is pulled to ≥600mV (e.g., via resistor divider), the internal 1.30V reference disconnects and both reset and low-line comparators accept external thresholds applied to LLIN/REFOUT and RESET IN/INT. The MAX820TCSE+ retains its ±2% accuracy advantage only in internal mode; external mode accuracy depends on resistor tolerance and reference drift.
How does the watchdog function work on MAX820TCSE+?
The MAX820TCSE+ watchdog monitors WDI for transitions. If no edge occurs within the timeout period (1.6s default, adjustable via SWT capacitor), WDPO pulses low for 0.5–6ms, followed 70ns later by WDO going low. WDO stays low until the next WDI edge. This two-stage alert enables single-fault warning (WDPO) and hard shutdown (WDO), supporting fail-safe system recovery protocols in the MAX820TCSE+.
What is the purpose of the CE IN and CE OUT pins on MAX820TCSE+?
The CE IN and CE OUT pins implement a transmission gate that blocks chip-enable signals during reset assertion. When reset is active, CE OUT is forced low if CE IN was low, holding memory access until power stabilizes. This ensures CMOS RAM or EEPROM write cycles complete before voltage collapse-preventing data corruption. The MAX820TCSE+ guarantees ≤10ns propagation delay and 15µs hold time, critical for fast-memory systems.
Can MAX820TCSE+ operate down to 1V supply voltage?
Yes, MAX820TCSE+ guarantees valid RESET output operation down to VCC = 1V in internal threshold mode. At 1V, RESET sinks 50µA with ≤0.3V saturation voltage. For full functionality (watchdog, CE gating, low-line), minimum VCC is 2.75V. The 1V guarantee is specific to reset assertion integrity during deep brownout-enabling safe shutdown sequencing even when other ICs cease operation.
MAX820TCSE+ 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:
- 3.06V
- 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
MAX820TCSE+ FAQ
1.How can I place an order for MAX820TCSE+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX820TCSE+ 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 MAX820TCSE+ reliable?
The price and inventory of MAX820TCSE+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX820TCSE+ is usually 5 days.
3.What payment methods are accepted for MAX820TCSE+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX820TCSE+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX820TCSE+?
MAX820TCSE+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX820TCSE+ 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 MAX820TCSE+?
For technical support, including MAX820TCSE+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX820TCSE+ requirements.
6.How does Aetrix verify that MAX820TCSE+ is sourced from the original manufacturer or authorized distributors?
All MAX820TCSE+ 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 MAX820TCSE+ meets industry standards.
7.What is the process for return or replacement of MAX820TCSE+?
All MAX820TCSE+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX820TCSE+, 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 MAX820TCSE+ part is unused and in its original packaging.
Return procedure for MAX820TCSE+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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