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Analog Devices Inc./Maxim Integrated MAX820RCPE+
- Part No.:
- MAX820RCPE+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 16-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX820RCPE+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 16DIP
- Quantity:
- Payment:
- Shipping:
Inventory:655
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Product details
Overview
MAX820RCPE+ from Maxim Integrated is a microprocessor supervisory circuit providing reset generation, manual reset input, two-stage power-fail warning, watchdog timer with pulsed fault output, and chip-enable gating for nonvolatile memory protection. It guarantees ±2% reset and low-line threshold accuracy, supports VCC down to 1V for valid RESET assertion, and operates over 0°C to +70°C in a 16-pin plastic DIP package. Used in embedded controllers and critical µP power monitoring systems.
For engineers reviewing the MAX820RCPE+ datasheet, MAX820RCPE+ pinout, MAX820RCPE+ application, or MAX820RCPE+ equivalent, this page delivers verified functional identity, exact pin roles, confirmed ±2% threshold accuracy, guaranteed 1V reset validity, and validated alternative options - all aligned with Maxim's official MAX792/MAX820 Rev. 4 datasheet (11/05).
Technical Context
The MAX820RCPE+ implements dual independent comparators for reset and low-line detection, with factory-trimmed internal thresholds (4.62V nominal reset, 4.74V nominal low-line) and ±2% accuracy. Its watchdog uses an external capacitor on SWT to set timeout (1.6s default), 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) that disables during reset to prevent memory corruption, and features a high-impedance MR input with 1.30V threshold and 12µs propagation delay. The LLIN/REFOUT pin serves as reference output (1.30V) in internal mode or low-line comparator input in external programming mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold Voltage | 4.62V ±2% (factory-trimmed, internal mode); ensures reliable µP reset initiation at precise supply voltage level |
| Low-Line Threshold | 4.74V (120mV above reset threshold); provides advance NMI warning before reset assertion |
| Power-On Reset Delay | 200ms typical; guarantees stable power-up timing for µP initialization sequence |
| Watchdog Timeout | 1.6s nominal (SWT tied to VCC); configurable via external capacitor for system-specific fault detection windows |
| RESET Validity Range | VCC ≥1V; enables robust reset signaling even during deep brownout conditions |
| CE Propagation Delay | 10ns maximum; supports high-speed µP bus timing without write-cycle interruption |
| Supply Current | 70µA typical at +25°C; minimizes quiescent load on regulated supply rails |
Pinout & Package
MAX820RCPE+ is housed in a 16-pin plastic DIP (Dual In-line Package) with 0.3-inch body width and through-hole mounting. Pin spacing is 0.1 inch, compatible with standard PCB layouts for legacy industrial and test equipment.
| 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 gating logic |
| 4 | RESET IN/INT | Mode select: ≤60mV → internal threshold mode; ≥600mV → external resistor-programmed mode |
| 5 | LLIN/REFOUT | In internal mode: 1.30V reference output; in external mode: low-line comparator input |
| 6 | OVO | Open-drain overvoltage comparator output; asserts low when OVI > 1.30V; uncommitted function |
| 7 | OVI | Inverting input to overvoltage comparator; connect to GND if unused |
| 8 | SWT | Watchdog timeout capacitor node; 1.6s default when tied to VCC; sets timeout via CSWT (k×C in nF) |
| 9 | MR | Manual reset input; 1.30V threshold, 12µs propagation delay, internally pulled up to VCC |
| 10 | LOW LINE | Active-low low-line output; asserts 120mV above reset threshold for early NMI warning |
| 11 | WDI | Watchdog input; requires edge or ≥100ns pulse every timeout period to prevent WDPO/WDO assertion |
| 12 | GND | Ground reference for all analog and digital circuitry; common return path for VCC and outputs |
| 13 | CE OUT | Chip-enable output; gated by CE IN and reset state; remains low 15µs after reset assertion if CE IN was low |
| 14 | CE IN | Chip-enable input; high-impedance during reset; enables memory write-cycle completion gating |
| 15 | WDO | Watchdog fault output; latched low until next WDI transition; used for hardware shutdown or MR assertion |
| 16 | WDPO | Watchdog pulse output; 1.7ms low pulse preceding WDO by 70ns; clocks external flip-flop for dual-fault latching |
Key Features
| Feature | Design Value |
|---|---|
| ±2% reset/low-line threshold accuracy | Enables precise, repeatable power-fail detection without external calibration in internal mode |
| Two-stage power-fail warning | Separate LOW LINE output asserts 120mV above reset threshold, allowing time-critical NMI response before reset |
| Pulsed watchdog output (WDPO) | Provides 1.7ms advance warning pulse before WDO assertion, enabling fail-safe hardware shutdown sequencing |
| On-board CE signal gating | Prevents memory corruption during brownout by disabling CE path within 15µs of reset assertion |
| 10ns max CE propagation delay | Supports high-speed µP buses (e.g., 80C88, Z80) without violating memory access timing margins |
Applications
| Industrial PLC Controller Power Monitoring | Medical Diagnostic Instrument Supervision |
|---|---|
Use Scenario: Monitors 5V supply rail in programmable logic controller during mains fluctuation or backup battery switchover. IC Role / Device Role / Timing Role: Generates precise 4.62V reset and 4.74V low-line signals; provides 200ms power-on delay and 1.6s watchdog timeout. Use Value: Prevents spurious µP execution during unstable supply transitions and enables deterministic NMI-triggered safety routines. |
Use Scenario: Ensures safe power sequencing and software integrity in portable ultrasound imaging device with EEPROM configuration storage. IC Role / Device Role / Timing Role: Gates CE signals to protect EEPROM writes during brownout; asserts RESET down to VCC = 1V for fail-safe shutdown. Use Value: Eliminates risk of corrupted calibration data or firmware state due to undervoltage memory access. |
| Automotive Engine Control Unit (ECU) Prototyping | Test & Measurement Equipment Power Integrity |
Use Scenario: Validates reset behavior and watchdog response under controlled lab conditions simulating automotive battery sag (8V→4V). IC Role / Device Role / Timing Role: Provides manual reset via front-panel pushbutton (MR), low-line NMI for diagnostic logging, and adjustable watchdog timeout. Use Value: Enables repeatable fault injection testing and real-time validation of ECU recovery logic without modifying µP firmware. |
Use Scenario: Maintains stable operation of benchtop oscilloscope mainboard during AC line disturbances or thermal cycling. IC Role / Device Role / Timing Role: Uses internal 4.62V threshold and 200ms reset delay to synchronize µP boot with FPGA configuration and ADC reference settling. Use Value: Guarantees deterministic startup sequence and prevents metastability in mixed-signal subsystems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX820SCPE+ | Lower reset threshold (4.37V ±2%), same package and pinout; identical functionality otherwise | Better suited for 4.5V nominal supply rails where 4.62V threshold risks nuisance resets | Select when operating near lower end of 5V tolerance band (e.g., 4.5V–4.75V systems) |
| MAX820TCPE+ | 3.06V ±2% reset threshold; same 16-pin DIP package and full feature set | Targeted at 3.3V systems requiring tight threshold matching and brownout immunity | Choose for modern low-voltage µPs (ARM Cortex-M, PIC32) with 3.3V supplies and strict reset margin requirements |
Compared with MAX820RCPE+, MAX820SCPE+ offers tighter alignment with 4.5V rails while maintaining identical timing and gating behavior, whereas MAX820TCPE+ shifts the entire supervision window to 3.3V domain-enabling direct drop-in use in mixed-voltage designs without recalculating external components.
Availability
MAX820RCPE+ is available at Aetrix Electronics and suitable for industrial PLC controller power monitoring, medical diagnostic instrument supervision, automotive ECU prototyping, and test & measurement equipment power integrity applications requiring stable component supply across extended production lifecycles.
Supply support for MAX820RCPE+ 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 MAX792/MAX820 product line was designed specifically for microprocessor supervisory functions-including precision reset generation, watchdog monitoring, and memory write protection-in systems lacking battery backup, targeting reliability-critical embedded applications.
FAQ
What is the exact reset threshold voltage of the MAX820RCPE+?
The MAX820RCPE+ has a factory-trimmed nominal reset threshold voltage of 4.62V with ±2% accuracy over temperature (0°C to +70°C). This value is specified in the Electrical Characteristics table under "Reset Threshold Voltage-Internal Threshold Mode" for the 'R' suffix variant. The low-line threshold is correspondingly 4.74V (120mV above reset), also guaranteed within ±2%.
Does the MAX820RCPE+ support operation below 2.75V supply voltage?
Yes - the MAX820RCPE+ guarantees valid RESET output down to VCC = 1V, though its minimum recommended operating voltage is 2.75V. Below 2.75V, internal comparators remain functional but supply current and propagation delays may deviate from datasheet specs. The 1V guarantee ensures fail-safe reset assertion during deep brownout events.
How is the watchdog timeout period configured on the MAX820RCPE+?
The MAX820RCPE+ watchdog timeout is set via the SWT pin: tying SWT to VCC selects the default 1.6s period; connecting a capacitor from SWT to GND configures alternate timeouts using k × C (nF) ms, where k = 16.2 at VCC = 5V. Capacitor values must exceed 4.7nF; 47nF yields ~760ms at 5V. Leaving SWT floating or grounded is prohibited.
Can the MAX820RCPE+ be used in external threshold programming mode?
Yes - the MAX820RCPE+ supports external programming mode by pulling the RESET IN/INT pin above 600mV (e.g., via resistor divider), disconnecting internal references and routing LLIN/REFOUT and RESET IN/INT to external comparator inputs. This allows custom reset/low-line thresholds, though ±2% accuracy applies only in internal mode per datasheet specification.
What is the purpose of the CE IN and CE OUT pins on the MAX820RCPE+?
The CE IN and CE OUT pins implement a transmission gate that passes chip-enable signals during normal operation but disables during reset to prevent memory corruption. When reset asserts, CE OUT holds low for 15µs if CE IN was low, ensuring write-cycle completion. Propagation delay is ≤10ns, supporting high-speed µP buses without timing violations.
MAX820RCPE+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-DIP (0.300", 7.62mm)
- 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:
- Through Hole
- Supplier Device Package:
- 16-PDIP
MAX820RCPE+ FAQ
1.How can I place an order for MAX820RCPE+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX820RCPE+ 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 MAX820RCPE+ reliable?
The price and inventory of MAX820RCPE+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX820RCPE+ is usually 5 days.
3.What payment methods are accepted for MAX820RCPE+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX820RCPE+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX820RCPE+?
MAX820RCPE+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX820RCPE+ 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 MAX820RCPE+?
For technical support, including MAX820RCPE+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX820RCPE+ requirements.
6.How does Aetrix verify that MAX820RCPE+ is sourced from the original manufacturer or authorized distributors?
All MAX820RCPE+ 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 MAX820RCPE+ meets industry standards.
7.What is the process for return or replacement of MAX820RCPE+?
All MAX820RCPE+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX820RCPE+, 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 MAX820RCPE+ part is unused and in its original packaging.
Return procedure for MAX820RCPE+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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