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Analog Devices Inc./Maxim Integrated MAX816CPA+
- Part No.:
- MAX816CPA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX816CPA+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,774
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Product details
Overview
MAX816CPA+ from Maxim Integrated is a high-accuracy, low-power microprocessor supervisory circuit with adjustable reset threshold, power-fail monitoring, and manual reset capability. It features ±1% worst-case reset threshold accuracy, 75µA max supply current, guaranteed RESET validity down to VCC = 1.0V, active-low and active-high RESET outputs, and operates across 3.06V–5.5V supply range. It is used in portable/battery-powered equipment for reliable µP power monitoring during brownout and startup.
For engineers reviewing the MAX816CPA+ datasheet, MAX816CPA+ pinout, MAX816CPA+ application, or MAX816CPA+ equivalent, key selection criteria include its adjustable reset input (RESET IN), 1.70V internal reference, PFI/PFO power-fail interface, manual reset timing (200ms pulse width), and compatibility with 3V/5V systems requiring stable reset assertion under fast transients.
Technical Context
The MAX816CPA+ uses an external resistive divider on the RESET IN pin (1.700V threshold, ≤35nA leakage) to set a custom reset trip point-enabling precise adaptation to nonstandard supply rails. Its power-fail comparator monitors PFI against a fixed 1.70V reference, driving PFO low when the monitored voltage falls below threshold.
Unlike the MAX814/MAX815, the MAX816CPA+ does not monitor VCC directly for reset generation; instead, it relies entirely on the voltage at RESET IN. It provides dual RESET outputs (active-low and active-high), both asserted for ≥140ms after RESET IN rises above 1.70V, with glitch immunity up to 30µs at 100mV overdrive.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold Accuracy | ±1% worst-case - ensures deterministic reset initiation across temperature, voltage, and process variation |
| Supply Current | 75µA max at +25°C - enables use in battery-critical portable systems without compromising runtime |
| Operating Voltage Range | 3.06V to 5.5V - supports direct integration into mixed 3.3V/5V systems without level-shifting |
| RESET Valid Down To | VCC = 1.0V - guarantees known logic state during deep brownout, preventing µP latch-up |
| RESET Pulse Width | 140ms min - meets minimum reset hold time requirements of most 8-/16-bit microprocessors |
| PFI Threshold | 1.70V fixed - allows early power-fail warning via external resistor divider on any monitored rail |
| RESET IN Input Leakage | ≤35nA - permits use of high-value resistors (e.g., 100kΩ/100kΩ) without significant threshold error |
Pinout & Package
MAX816CPA+ is housed in an 8-pin plastic DIP (PDIP) package with 0.3-inch width, RoHS-compliant lead-free finish (+ suffix). Pin spacing conforms to standard 0.1-inch grid; body dimensions are 9.27mm × 6.35mm × 3.3mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 MR | Manual Reset Input | Active-low CMOS-compatible input with 150µA internal pullup; triggers reset when pulled <1.10V |
| 2 VCC | Positive Supply Input | Primary power rail (3.06–5.5V); powers internal comparators and outputs but does not control RESET logic |
| 3 GND | Ground Reference | Common return path for all analog and digital functions; must be low-impedance for accurate threshold sensing |
| 4 PFI | Power-Fail Input | High-impedance analog input compared to 1.70V reference; accepts voltage divider from any monitored rail |
| 5 PFO | Power-Fail Output | Open-drain output sinking ≥1.2mA; asserts low when PFI < 1.70V to signal impending supply collapse |
| 6 RESET IN | Adjustable Reset Comparator Input | High-Z input (≤35nA leakage) referenced to 1.70V; determines reset point via external R1/R2 divider |
| 7 RESET | Active-Low Reset Output | Push-pull output; drives low for ≥140ms after RESET IN rises above 1.70V; valid to VCC = 1.0V |
| 8 RESET | Active-High Reset Output | Inverted copy of pin 7; provides logic-high assertion during reset condition for compatible µP interfaces |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable Reset Threshold | Set via external resistor divider on RESET IN pin; achieves ±1.2% accuracy with 0.1% resistors |
| Power-Fail Warning Interface | Dedicated PFI/PFO pair with 1.70V reference enables early detection of supply degradation before brownout |
| Glitch-Immune Reset Comparator | Rejects negative VCC transients ≤30µs at 100mV overdrive - prevents spurious resets in noisy environments |
| Dual RESET Outputs | Simultaneous active-low and active-high signals eliminate need for external inverters in mixed-logic systems |
| Low-Line Independence | No LOW LINE output - unlike MAX814, MAX816CPA+ focuses solely on RESET IN–driven reset and PFI monitoring |
Applications
| Portable Medical Devices | Battery-Powered Data Loggers |
|---|---|
Use Scenario: Wearable ECG monitor operating from single Li-ion cell with dynamic load and intermittent RF transmission. IC Role / Device Role / Timing Role: Supervisory circuit asserting reset when battery voltage drops below 3.1V (set via RESET IN divider), while PFI monitors backup rail for early shutdown warning. Use Value: Prevents data corruption during brownout by guaranteeing ≥140ms reset pulse while enabling graceful save-to-flash before power loss. |
Use Scenario: Remote environmental sensor node powered by solar-charged LiFePO₄ battery, logging temperature/humidity every 5 minutes. IC Role / Device Role / Timing Role: Generates system reset when main supply falls below 3.2V; PFO interrupts µP to trigger immediate flash commit and sleep entry upon PFI threshold breach. Use Value: Extends usable battery life by allowing operation down to 3.06V while ensuring deterministic reset behavior even as battery impedance rises with age. |
| Industrial PLC I/O Modules | Set-Top Box Power Sequencing |
Use Scenario: DIN-rail mounted I/O module with isolated 3.3V logic and 24V field-side supplies, subject to EFT and surge events. IC Role / Device Role / Timing Role: Provides robust reset initiation based on local 3.3V rail (via RESET IN), decoupled from noisy 24V domain; MR enables field-service reset. Use Value: Eliminates false resets from 24V transients by referencing only clean 3.3V rail, while 75µA quiescent current minimizes standby loss. |
Use Scenario: Consumer STB with multi-rail power (12V, 5V, 3.3V) requiring coordinated reset sequencing during AC dropout. IC Role / Device Role / Timing Role: Monitors 3.3V core rail via RESET IN; PFI tracks 5V AV rail to generate preemptive PFO interrupt before 3.3V collapse. Use Value: Enables seamless HDMI hot-plug recovery and channel buffer preservation by initiating controlled shutdown 50–100ms before final reset. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX814CPA+ | Fixed 4.55V reset threshold (N-suffix); includes LOW LINE output; no RESET IN pin | Suitable for 5V systems needing factory-set reset and low-line warning, not adjustable thresholds | Select when design uses stable 5V rail and requires early brownout alert via LOW LINE |
| TPS3808G33DBVR | Fixed 3.3V reset threshold; 1.8µA quiescent current; no PFI/PFO; only active-low RESET | Optimized for ultra-low-power 3.3V systems where power-fail warning is unnecessary | Select when minimizing standby current is critical and power-fail monitoring is handled externally |
Compared with MAX816CPA+, MAX814CPA+ offers fixed-threshold simplicity and low-line detection but lacks adjustability, while TPS3808G33DBVR delivers extreme low-power operation at the cost of missing PFI/PFO functionality and reset flexibility - making MAX816CPA+ the optimal choice for designs requiring custom reset points and integrated power-fail signaling.
Availability
MAX816CPA+ is available at Aetrix Electronics and suitable for portable medical devices, battery-powered data loggers, industrial PLC I/O modules, and set-top box power sequencing requiring stable component supply across extended temperature and voltage ranges.
Supply support for MAX816CPA+ 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 consumer applications.
The MAX814/MAX815/MAX816 family was designed specifically for precision µP supervision in space-constrained, low-power systems where reset accuracy, supply flexibility, and early power-fail detection are critical.
FAQ
What is the function of the RESET IN pin on the MAX816CPA+?
The RESET IN pin on the MAX816CPA+ is the adjustable reset comparator input, referenced to an internal 1.700V threshold. It accepts a voltage divider from the supply rail being monitored, enabling custom reset points. When the voltage at RESET IN falls below 1.700V, the MAX816CPA+ asserts both RESET outputs; the reset remains active for ≥140ms after RESET IN rises above threshold. This pin replaces VCC-based reset sensing used in MAX814/MAX815.
Does the MAX816CPA+ provide watchdog timer functionality?
No, the MAX816CPA+ does not include a watchdog timer. That function is exclusive to the MAX815 series (e.g., MAX815CPA+), which features WDI and WDO pins. The MAX816CPA+ is optimized for adjustable reset and power-fail monitoring only - confirmed by its pinout (no WDI/WDO), block diagram, and feature table in the official datasheet.
What is the maximum supply voltage for the MAX816CPA+?
The MAX816CPA+ supports an operating voltage range of 3.06V to 5.5V on the VCC pin. Absolute maximum rating is 6.0V, but functional operation is guaranteed only within 3.06V–5.5V. Exceeding 5.5V risks damage or undefined behavior, per the Absolute Maximum Ratings table in the datasheet.
How do I calculate the resistor values for the RESET IN divider on the MAX816CPA+?
Use the formula VRT = VRIT × (1 + R1/R2), where VRT is the desired reset threshold, VRIT = 1.700V, R1 connects between VRT and RESET IN, and R2 connects between RESET IN and GND. For example, to set VRT = 3.3V: 3.3 = 1.7 × (1 + R1/R2) → R1/R2 ≈ 0.941. With R2 = 100kΩ, R1 = 94.1kΩ (use 93.1kΩ or 95.3kΩ 1% standard value). Accuracy improves with tighter-tolerance resistors.
Can the MAX816CPA+ monitor negative supply voltages?
Yes - the MAX816CPA+ can monitor negative rails using the PFI input. As described in the Applications Information section, connect the negative rail through a resistor divider to shift the voltage into the 0–1.7V range acceptable at PFI. When the negative rail degrades (becomes less negative), PFI voltage rises toward 1.70V, causing PFO to go high and signal failure. This technique is validated in Figure 12 of the MAX816CPA+ datasheet.
MAX816CPA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- Adjustable/Selectable
- 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:
- 8-PDIP
MAX816CPA+ FAQ
1.How can I place an order for MAX816CPA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX816CPA+ 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 MAX816CPA+ reliable?
The price and inventory of MAX816CPA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX816CPA+ is usually 5 days.
3.What payment methods are accepted for MAX816CPA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX816CPA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX816CPA+?
MAX816CPA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX816CPA+ 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 MAX816CPA+?
For technical support, including MAX816CPA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX816CPA+ requirements.
6.How does Aetrix verify that MAX816CPA+ is sourced from the original manufacturer or authorized distributors?
All MAX816CPA+ 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 MAX816CPA+ meets industry standards.
7.What is the process for return or replacement of MAX816CPA+?
All MAX816CPA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX816CPA+, 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 MAX816CPA+ part is unused and in its original packaging.
Return procedure for MAX816CPA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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