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Analog Devices Inc./Maxim Integrated MAX814KESA
- Part No.:
- MAX814KESA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX814KESA.pdf
- Description:
- IC SUPERVISOR MPU
- Quantity:
- Payment:
- Shipping:
Inventory:1,111
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Product details
Overview
MAX814KESA 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 4.80V ±1% reset threshold, 200ms reset pulse width, active-low RESET output, and guaranteed valid reset assertion down to VCC = 1V. It is used in medical equipment and portable battery-powered devices requiring reliable brownout detection and glitch immunity.
For engineers reviewing the MAX814KESA datasheet, MAX814KESA pinout, MAX814KESA application, or MAX814KESA equivalent, this page delivers verified technical context, exact pin roles, real-world use scenarios, and validated alternative parts - all grounded in Maxim's official specifications for the K-suffix 4.8V variant in SO-8 package.
Technical Context
The MAX814KESA implements a precision reset comparator with ±1% worst-case threshold accuracy at 4.80V, independent low-line detection (60mV above reset threshold), and a dedicated power-fail monitor with 2.50V reference. Its reset generator guarantees correct logic state for VCC ≥ 1V and ignores transients ≤30µs when VCC dips 100mV below threshold.
It integrates a 150µA internal MR pull-up, supports CMOS/TTL-compatible manual reset input, and provides PFO open-drain output for early power-fail interrupt signaling. Unlike MAX815/MAX816, it lacks watchdog or adjustable reset functionality - its architecture is optimized solely for fixed-threshold, dual-output (RESET/RESET) supervision of stable +5V rails.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.80V ±1% - ensures reliable reset initiation across temperature, voltage, and load variations in 5.0V ±4% systems. |
| Reset Pulse Width | 200ms minimum - guarantees µP initialization completes before release from reset during power-up or brownout recovery. |
| Supply Current | 75µA max - enables use in always-on, battery-backed monitoring circuits without significant drain. |
| VCC Operating Range | 4.85V to 5.5V - matches nominal +5V supply tolerance and supports operation up to 5.5V for margin. |
| RESET Output Type | Active-low open-drain with active-high inverted output - allows direct interface to both active-low and active-high µP reset inputs. |
| Power-Fail Reference | 2.50V - enables early warning detection of +5V rail collapse via external resistor divider on PFI pin. |
| Low-Line Threshold | 4.86V (4.80V + 60mV) - triggers LOW LINE output ~60mV before reset, providing NMI-based pre-reset alert for orderly shutdown. |
Pinout & Package
MAX814KESA is housed in an 8-pin SO (Small Outline) package, RoHS-compliant and rated for 0°C to +70°C commercial operation. Pin assignments are identical to the 8-pin DIP variant but in surface-mount form factor.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 MR | Manual Reset Input | Active-low CMOS/TTL-compatible input with 150µA internal pull-up; asserts reset when pulled below 1.10V. |
| 2 VCC | Positive Power Supply | +5V supply input; reset asserted while VCC < 4.80V, guaranteed functional down to VCC = 1V. |
| 3 GND | Ground Reference | System ground return for all internal comparators and outputs. |
| 4 PFI | Power-Fail Input | Monitors external voltage divider; asserts PFO when input falls below 2.50V reference. |
| 5 PFO | Power-Fail Output | Open-drain output sinking ≥1.2mA; used to trigger µP interrupt before main reset occurs. |
| 6 LOW LINE | Low-Line Warning Output | Open-drain output asserting low when VCC drops to 4.86V - provides pre-reset warning with 60mV hysteresis. |
| 7 RESET | Active-Low Reset Output | Open-drain reset signal; held low for ≥200ms after VCC rises above 4.80V or MR deasserts. |
| 8 RESET | Active-High Reset Output | Inverted copy of RESET; logic high during normal operation, low during reset - eliminates need for external inverter. |
Key Features
| Feature | Design Value |
|---|---|
| ±1% Worst-Case Reset Accuracy | Eliminates manual trimming and ensures deterministic reset behavior over full temperature and supply range. |
| Guaranteed RESET Valid to VCC = 1V | Enables robust reset assertion even during deep brownout or slow power-down, preventing µP runaway. |
| Power-Supply Glitch Immunity | Rejects negative VCC transients ≤30µs at 100mV overdrive - prevents spurious resets in noisy environments. |
| Dual Reset Outputs (RESET/RESET) | Supports direct connection to both active-low and active-high µP reset pins without external logic. |
| Early Low-Line Warning (LOW LINE) | Provides 60mV headroom before reset assertion, enabling µP to execute critical shutdown routines preemptively. |
Applications
| Medical Equipment Monitoring | Portable Diagnostic Device |
|---|---|
Use Scenario: Continuous power supervision in handheld ultrasound or glucose meters where battery voltage decay must trigger controlled shutdown before data corruption. IC Role / Device Role / Timing Role: Supervisory IC generating precise reset and low-line warning signals tied to µP NMI and reset inputs. Use Value: 4.80V ±1% threshold and 200ms pulse ensure µP completes EEPROM save routines before power loss; LOW LINE gives 60mV advance warning. |
Use Scenario: Battery-powered field instrument operating from Li-ion (4.2V–3.0V) with regulated +5V rail, requiring brownout resilience during discharge. IC Role / Device Role / Timing Role: Fixed-threshold supervisor monitoring regulated +5V rail, asserting reset when input regulator fails or battery sags. Use Value: 75µA supply current extends battery life; guaranteed RESET validity to VCC = 1V prevents erratic behavior during final discharge phase. |
| Industrial Controller HMI | Set-Top Box Power Management |
Use Scenario: Human-machine interface module in PLC rack needing deterministic reset on AC power interruption or DC rail droop. IC Role / Device Role / Timing Role: Primary reset generator interfacing with ARM Cortex-M µP reset and NMI pins via RESET and LOW LINE outputs. Use Value: Dual outputs eliminate level-shifting components; 2.50V PFI reference enables custom early-warning threshold for auxiliary 3.3V rail monitoring. |
Use Scenario: Consumer STB with multiple voltage rails (+5V, +3.3V, +1.2V) where +5V rail failure must initiate graceful firmware shutdown before HDMI link loss. IC Role / Device Role / Timing Role: Dedicated +5V supervisor feeding reset and PFO interrupt to media processor to flag impending power collapse. Use Value: PFO open-drain output directly drives processor interrupt line; 200ms reset pulse satisfies STB boot-loader timing requirements. |
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 instead of 4.80V; otherwise identical pinout, timing, and feature set. | Suitable for +5V systems with ±5% supply tolerance where lower trip point maximizes operational guard band. | Select MAX814LESA when system VCC minimum is 4.65V and design requires reset at lower voltage than MAX814KESA. |
| TPS3808G33DBVR | 3.3V fixed threshold, 350ms reset delay, 1.6µA quiescent current; no LOW LINE or PFO outputs. | Optimized for ultra-low-power 3.3V µP supervision only - lacks dual outputs and early-warning capability. | Choose TPS3808G33DBVR only for simple 3.3V reset needs where power budget is critical and advanced features are unnecessary. |
Compared with MAX814KESA, MAX814LESA offers a lower reset threshold for wider supply-margin designs, while TPS3808G33DBVR trades supervision richness for extreme low-power operation - neither provides the same combination of 4.8V accuracy, dual reset polarity, LOW LINE warning, and PFO interrupt in one SO-8 device.
Availability
MAX814KESA is available at Aetrix Electronics and suitable for medical equipment, portable diagnostic devices, industrial controllers, and set-top boxes requiring stable component supply with guaranteed long-term manufacturability.
Supply support for MAX814KESA 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, medical, and communications applications.
The MAX814 family is designed specifically for precision microprocessor supervision in +3V and +5V systems, delivering guaranteed reset accuracy, low quiescent current, and integrated early-warning features without external components.
FAQ
What is the exact reset threshold voltage of the MAX814KESA?
The MAX814KESA has a factory-trimmed reset threshold of 4.80V with ±1% worst-case accuracy across temperature and supply voltage. This means the actual trip point falls between 4.752V and 4.848V under all specified operating conditions, ensuring compatibility with 5.0V ±4% power supplies in mission-critical applications.
Does the MAX814KESA include a watchdog timer function?
No, the MAX814KESA does not include a watchdog timer. That function is exclusive to the MAX815 variant. The MAX814KESA provides only power-on reset, manual reset, power-fail monitoring (via PFI/PFO), and low-line warning (via LOW LINE) - all centered on precise voltage supervision of the +5V rail.
Can the MAX814KESA monitor voltages other than VCC?
Yes - the PFI pin accepts an externally derived voltage, allowing the MAX814KESA to supervise auxiliary rails like +12V or +3.3V using a resistor divider. For example, connecting a 340kΩ/100kΩ divider to +12V yields ~2.73V at PFI, triggering PFO when the +12V rail falls below ~11.0V, as documented in Maxim's Figure 11.
What is the purpose of the LOW LINE pin on the MAX814KESA?
The LOW LINE pin is an open-drain output that goes low when VCC drops to 60mV above the 4.80V reset threshold (i.e., at ~4.86V). It provides a pre-reset warning signal, typically routed to a µP's NMI input to initiate data save or state preservation routines before the main RESET signal asserts at 4.80V.
Is the MAX814KESA pin-compatible with other variants in the MAX814/MAX815/MAX816 family?
Yes - all MAX814, MAX815, and MAX816 variants share identical 8-pin SO and DIP footprints and pin assignments. However, functional differences exist: MAX814KESA lacks WDI/WDO (watchdog) and RESET IN (adjustable threshold) pins, which are unused and internally disconnected in this variant.
MAX814KESA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.8V
- 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
MAX814KESA FAQ
1.How can I place an order for MAX814KESA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX814KESA 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 MAX814KESA reliable?
The price and inventory of MAX814KESA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX814KESA is usually 5 days.
3.What payment methods are accepted for MAX814KESA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX814KESA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX814KESA?
MAX814KESA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX814KESA 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 MAX814KESA?
For technical support, including MAX814KESA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX814KESA requirements.
6.How does Aetrix verify that MAX814KESA is sourced from the original manufacturer or authorized distributors?
All MAX814KESA 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 MAX814KESA meets industry standards.
7.What is the process for return or replacement of MAX814KESA?
All MAX814KESA units undergo pre-shipment inspection (PSI). If there is an issue with MAX814KESA, 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 MAX814KESA part is unused and in its original packaging.
Return procedure for MAX814KESA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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