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Analog Devices Inc./Maxim Integrated MAX814NESA+
- Part No.:
- MAX814NESA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX814NESA+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,482
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Product details
Overview
MAX814NESA+ from Maxim Integrated is a high-accuracy, low-power microprocessor supervisory circuit providing power-on reset, manual reset, and early power-fail warning functions for +5V systems. It features a 4.55V ±1% reset threshold, 200ms reset pulse width, active-low RESET output, guaranteed valid operation down to VCC = 1V, and 75µA max supply current - enabling reliable reset control in portable and medical equipment.
For engineers reviewing the MAX814NESA+ datasheet, MAX814NESA+ pinout, MAX814NESA+ application, or MAX814NESA+ equivalent, this device serves as a precision voltage-monitoring solution for critical µP power monitoring where ±1% threshold accuracy, glitch immunity, and low quiescent current are essential selection criteria.
Technical Context
The MAX814NESA+ implements a dedicated reset comparator with fixed 4.55V trip point (±1% worst-case), a separate low-line detector set 60mV above reset threshold, and a power-fail comparator referenced to 2.50V on PFI. Its internal 150µA MR pull-up enables direct switch-to-GND manual reset without external components.
RESET assertion is synchronized to VCC crossing the threshold, with a guaranteed minimum 200ms pulse width after release and immunity to transients ≤30µs at 100mV overdrive. The device operates across 4.60V–5.5V VCC and maintains valid RESET output down to 1V, supporting brownout detection in battery-backed systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.55V ±1% - ensures precise power-on reset initiation for 5V systems with ±10% supply tolerance. |
| Reset Pulse Width | 200ms min - guarantees sufficient duration to fully initialize microprocessors and peripherals. |
| Supply Current | 75µA max - enables use in always-on, battery-powered applications without significant drain. |
| VCC Operating Range | 4.60V to 5.5V - supports stable operation across full industrial 5V rail tolerances. |
| RESET Valid Down To | VCC = 1V - provides deterministic reset state during deep brownout, preventing undefined µP behavior. |
| Power-Fail Reference | 2.50V on PFI - allows early warning of +5V supply collapse via external resistive divider. |
| Low-Line Offset | 60mV above reset threshold - delivers pre-reset warning for orderly shutdown in portable systems. |
Pinout & Package
MAX814NESA+ is housed in an 8-pin SO (Small Outline) package with gull-wing leads, RoHS-compliant and lead-free (+ suffix). Pin 1 is marked with a dot or bevel; the package outline conforms to JEDEC MS-012AA.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 MR | Manual Reset Input | Active-low input with 150µA internal pull-up to VCC; triggers reset when pulled below 1.10V; compatible with CMOS/TTL logic or momentary switch to GND. |
| 2 VCC | Positive Power Supply | Main +5V supply input; reset asserted while VCC < 4.55V; RESET remains valid down to 1V. |
| 3 GND | Ground Reference | System ground return path for all internal comparators and outputs. |
| 4 PFI | Power-Fail Input | Monitors external voltage via resistor divider; comparator trips at 2.50V; used for early warning of supply collapse. |
| 5 PFO | Power-Fail Output | Open-drain output; sinks ≥1.2mA when PFI < 2.50V; signals µP interrupt prior to reset assertion. |
| 6 LOW LINE | Low-Line Detector Output | Active-low output asserting when VCC falls 60mV above 4.55V; provides pre-reset NMI for shutdown sequencing. |
| 7 RESET | Reset Output | Active-low, push-pull output; guaranteed <0.4V at 3.2mA sink; asserts during power-up, brownout, and manual reset. |
| 8 RESET | Reset Output (Active-High) | Inverted copy of pin 7; complementary signal for systems requiring active-high reset logic. |
Key Features
| Feature | Design Value |
|---|---|
| ±1% Worst-Case Reset Accuracy | Eliminates manual trimming and ensures system-level reset timing compliance across temperature, voltage, and process variation. |
| Guaranteed RESET Valid to VCC = 1V | Prevents metastability in µP reset inputs during deep brownout, enabling fail-safe shutdown before complete power loss. |
| Power-Supply Glitch Immunity | Rejects negative VCC transients ≤30µs at 100mV overdrive - avoids spurious resets in noisy or switching-power environments. |
| Integrated Low-Line Detector | Provides 60mV hysteresis-based early warning before reset assertion, allowing µP time to save state and execute controlled power-down. |
| Self-Contained Manual Reset | Internal 150µA MR pull-up eliminates need for external resistor, simplifying PCB layout and reducing BOM count. |
Applications
| Medical Equipment | Portable/Battery-Powered Equipment |
|---|---|
Use Scenario: Battery-operated infusion pumps requiring fail-safe power monitoring during clinical use. IC Role / Device Role / Timing Role: Supervisory circuit asserting reset and low-line warning to halt motor control and preserve EEPROM data before brownout. Use Value: 4.55V ±1% threshold and 60mV low-line offset enable precise margining against Li-ion discharge curve, extending usable battery life while guaranteeing safe shutdown. | Use Scenario: Handheld diagnostic instruments powered by primary alkaline cells. IC Role / Device Role / Timing Role: Primary reset generator and early power-fail indicator coordinating µP-controlled display dimming and memory backup. Use Value: 75µA max supply current minimizes standby drain; RESET valid to 1V ensures deterministic behavior even as cells deplete to end-of-life voltage. |
| Controllers | Set-Top Boxes |
Use Scenario: Industrial PLC I/O modules subject to 24V DC supply ripple and transient noise. IC Role / Device Role / Timing Role: Voltage supervisor enforcing clean boot sequence and rejecting line glitches that could corrupt firmware execution. Use Value: Glitch immunity up to 30µs at 100mV overdrive prevents false resets during relay switching or ESD events on shared power rails. | Use Scenario: Consumer STBs with dual-rail (5V/3.3V) power architecture and thermal throttling requirements. IC Role / Device Role / Timing Role: Coordinating power-on reset timing across multiple ASICs and managing early warning for 5V rail collapse during overheating-induced current limiting. Use Value: PFI/PFO interface enables independent monitoring of 5V rail while RESET synchronizes boot across SoC and peripheral ICs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX814LESA+ | 4.70V ±1% reset threshold; higher trip point optimized for 5V ±5% supplies. | Better suited for systems with tighter VCC regulation where earlier reset assertion is required. | Select MAX814LESA+ when design uses regulated 5V ±5% supply and requires reset at 4.70V rather than 4.55V. |
| TPS3808G33DBVR | 3.3V fixed reset threshold; 350ms reset timeout; 2.9µA quiescent current; SOT-23-6 package. | Targeted at ultra-low-power 3.3V systems; lacks low-line output and PFI/PFO functionality. | Choose TPS3808G33DBVR only for 3.3V-only applications prioritizing minimal current draw over multi-voltage monitoring capability. |
Compared with MAX814LESA+, MAX814NESA+ offers lower reset threshold for wider 5V supply tolerance; compared with TPS3808G33DBVR, it provides full +5V supervision with low-line warning and power-fail signaling - making it suitable for complex multi-rail embedded controllers where timing-critical brownout response is mandatory.
Availability
MAX814NESA+ is available at Aetrix Electronics and suitable for medical equipment, portable/battery-powered equipment, controllers, and set-top boxes requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for MAX814NESA+ 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 industrial, medical, and communications applications, emphasizing high accuracy, low power, and robustness.
The MAX814/MAX815/MAX816 family was engineered specifically for microprocessor power supervision in mission-critical systems - delivering ±1% reset accuracy, glitch immunity, and integrated low-line/power-fail monitoring without external components.
FAQ
What is the exact reset threshold voltage of the MAX814NESA+?
The MAX814NESA+ has a factory-trimmed reset threshold of 4.55V with ±1% worst-case accuracy across temperature, voltage, and process variations. This value is confirmed in the Electrical Characteristics table for +5V parts (MAX814N/MAX815N) and corresponds to the "N" suffix designation per Maxim's ordering guide. The threshold remains stable over the full operating range of 4.60V to 5.5V VCC.
Does the MAX814NESA+ support manual reset functionality?
Yes, the MAX814NESA+ includes a dedicated MR (Manual Reset) input on pin 1. It is an active-low input with an internal 150µA pull-up to VCC, allowing direct connection to a momentary switch to ground without external components. When MR is pulled below 1.10V, RESET asserts immediately and remains low for at least 200ms after MR returns high.
Can the MAX814NESA+ monitor voltages other than VCC?
Yes - the MAX814NESA+ can monitor secondary supply rails using its PFI (Power-Fail Input) pin. By connecting a resistor divider to PFI, any voltage can be scaled to match the 2.50V internal reference. For example, a +12V rail can be monitored by setting the divider ratio so PFI reaches 2.50V when the +12V supply drops to ~11.0V, triggering PFO to alert the µP before VCC fails.
What is the purpose of the LOW LINE output on the MAX814NESA+?
The LOW LINE output on pin 6 of the MAX814NESA+ is a dedicated early-warning signal that goes low when VCC falls 60mV above the 4.55V reset threshold (i.e., at ~4.61V). Unlike RESET, it asserts before the actual reset condition, giving the microprocessor time to execute shutdown routines - especially valuable in battery-powered systems where reserve energy enables graceful power-down.
Is the MAX814NESA+ compatible with both 5V and 3.3V systems?
The MAX814NESA+ is specified for +5V operation (VCC = 4.60V to 5.5V) and is not rated for direct 3.3V supply. While it may function at lower voltages, its reset comparator, PFI reference, and output drive strength are characterized only within the 4.60–5.5V range. For 3.3V systems, Maxim recommends the MAX814TESA+ (3.03V threshold) or MAX816 variants instead of MAX814NESA+.
MAX814NESA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-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:
- 4.55V
- 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:
- 8-SOIC
MAX814NESA+ FAQ
1.How can I place an order for MAX814NESA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX814NESA+ 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 MAX814NESA+ reliable?
The price and inventory of MAX814NESA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX814NESA+ is usually 5 days.
3.What payment methods are accepted for MAX814NESA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX814NESA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX814NESA+?
MAX814NESA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX814NESA+ 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 MAX814NESA+?
For technical support, including MAX814NESA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX814NESA+ requirements.
6.How does Aetrix verify that MAX814NESA+ is sourced from the original manufacturer or authorized distributors?
All MAX814NESA+ 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 MAX814NESA+ meets industry standards.
7.What is the process for return or replacement of MAX814NESA+?
All MAX814NESA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX814NESA+, 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 MAX814NESA+ part is unused and in its original packaging.
Return procedure for MAX814NESA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX814NESA+ Tags
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MIC826SYMT-TR
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