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Analog Devices Inc./Maxim Integrated MAX814KEPA+
- Part No.:
- MAX814KEPA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX814KEPA+.pdf
- Description:
- IC SUPERVISOR MPU LP 8-DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,899
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Product details
Overview
MAX814KEPA+ 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 operation 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 MAX814KEPA+ datasheet, MAX814KEPA+ pinout, MAX814KEPA+ application, or MAX814KEPA+ 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 +5V variant in 8-pin PDIP packaging.
Technical Context
The MAX814KEPA+ implements a precision voltage-monitoring architecture with independent reset comparator, low-line detector (60mV above reset threshold), and power-fail comparator (2.50V reference). Its reset assertion is guaranteed for VCC ≥ 1V, and it ignores fast transients ≤30µs at 100mV overdrive below threshold.
It supports manual reset via MR pin (150µA internal pull-up, 1.10V logic threshold) and provides PFO output for early power-fail interrupt signaling. Unlike MAX815/MAX816, it lacks watchdog timer or adjustable reset input - its reset is strictly VCC-referenced and fixed at 4.80V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.80V ±1% - ensures reliable reset initiation across temperature, supply tolerance, and load variation in 5V ±4% systems. |
| Reset Pulse Width | 200ms minimum - guarantees µP initialization completes before release from reset after power-up or brownout recovery. |
| Supply Current | 75µA max - enables integration into ultra-low-power portable and battery-backed applications without significant drain. |
| VCC Operating Range | 1.0V to 5.5V - allows valid RESET assertion during deep brownout and compatibility with wide-input DC-DC stages. |
| Power-Fail Reference | 2.50V - enables early warning of +5V rail collapse when PFI is connected to a resistive divider monitoring that rail. |
| Low-Line Threshold | 60mV above reset threshold - provides NMI-capable pre-reset warning for orderly shutdown in battery systems. |
| Reset Output Type | Active-low, push-pull - drives standard CMOS/TTL reset inputs directly without external pull-up. |
Pinout & Package
MAX814KEPA+ is supplied in an 8-pin plastic DIP (PDIP) package with 0.3-inch width, leaded (Pb) and RoHS-compliant variants available. Pin 1 is marked by a notch or dot; pin numbering proceeds counterclockwise.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 MR | Manual Reset Input | Active-low trigger with 150µA internal pull-up; asserts reset when pulled below 1.10V; compatible with switch-to-GND or open-drain logic. |
| 2 VCC | Positive Supply Input | Main power connection; reset is asserted when VCC falls below 4.80V and remains valid down to 1.0V. |
| 3 GND | Ground Reference | System ground return for all internal comparators and outputs; must be low-impedance for accurate threshold sensing. |
| 4 PFI | Power-Fail Input | Monitors external voltage via resistor divider; comparator trips at 2.50V - used for early warning of +5V rail failure. |
| 5 PFO | Power-Fail Output | Active-low open-drain output (1.2mA sink); signals PFI threshold breach to µP interrupt or control logic. |
| 6 LOW LINE | Low-Line Detector Output | Active-low push-pull output; asserts ~60mV above reset threshold to warn of imminent brownout before reset occurs. |
| 7 RESET | Reset Output | Active-low push-pull output; guaranteed logic low (≤0.4V) for VCC ≥ 1V; meets µP reset timing requirements. |
| 8 RESET | Active-High Reset Output | Inverted copy of pin 7; provides direct interface to µPs requiring active-high reset assertion. |
Key Features
| Feature | Design Value |
|---|---|
| ±1% worst-case reset threshold accuracy | Eliminates manual trimming and ensures system-level reset reliability across full temp/voltage/load range without calibration. |
| Guaranteed RESET validity to VCC = 1V | Enables robust brownout response in systems with slow-falling supplies or backup capacitors, preventing undefined µP states. |
| Power-supply glitch immunity | Rejects negative VCC transients ≤30µs at 100mV overdrive - prevents spurious resets in electrically noisy environments. |
| Integrated low-line detector | Provides 60mV pre-reset warning on same die - reduces BOM count vs. discrete comparator solutions for shutdown sequencing. |
| 200ms reset time delay | Meets JEDEC JESD8-12B and Intel 80x86 reset timing requirements for stable clock and memory initialization. |
Applications
| Medical Infusion Pumps | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Battery-backed infusion pump operating from 5V rail with critical safety-critical firmware execution. IC Role / Device Role / Timing Role: Supervisory circuit asserting reset during AC loss, battery sag, or brownout to force controlled reinitialization and prevent dose miscalculation. Use Value: 4.80V ±1% threshold ensures reset triggers before µP supply violates 4.75V min spec; LOW LINE output initiates data save 60mV before reset. | Use Scenario: DIN-rail mounted PLC module powered from 5V industrial supply subject to motor switching noise and line sags. IC Role / Device Role / Timing Role: Primary reset generator immune to 30µs VCC glitches, with PFO signaling early rail degradation to host controller. Use Value: 75µA supply current minimizes thermal impact in sealed enclosures; 2.50V PFI reference enables precise +5V undervoltage detection. |
| Portable ECG Monitors | Set-Top Box Power Management |
Use Scenario: Handheld ECG device using Li-ion battery with discharge curve crossing 4.8V threshold during end-of-life operation. IC Role / Device Role / Timing Role: Brownout detector triggering controlled shutdown before analog front-end or ADC fails, preserving last waveform segment. Use Value: Valid RESET down to VCC = 1V ensures deterministic state even during deep battery depletion; MR pin enables field service reset. | Use Scenario: Consumer STB with dual-rail (5V/3.3V) power and requirement for graceful firmware save on AC dropout. IC Role / Device Role / Timing Role: Reset supervisor coordinating 200ms hold-off for DDR memory retention and flash write completion before power collapse. Use Value: Active-high and active-low RESET outputs simplify interface to mixed-voltage SoC reset domains; PFO interrupts CPU for emergency save routine. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX814LEPA+ | 4.70V ±1% reset threshold; otherwise identical pinout, timing, and feature set. | Suitable for 5V ±5% systems where wider supply tolerance is acceptable and lower trip point extends operational window. | Select MAX814LEPA+ when system design uses looser 5V regulation or requires longer uptime before reset assertion. |
| TPS3808G33DBVR | 3.3V fixed reset threshold; 350ms reset timeout; 2.5µA quiescent current; SOT-23-6 package. | Optimized for ultra-low-power 3.3V systems; lacks LOW LINE and PFI/PFO functions; no manual reset input. | Choose TPS3808G33DBVR only for space-constrained 3.3V designs where extended battery life outweighs need for early warning and manual reset. |
Compared with MAX814LEPA+, the MAX814KEPA+ offers higher reset threshold for tighter 5V supply systems; compared with TPS3808G33DBVR, it provides full supervisory functionality (PFI/PFO, LOW LINE, MR) in PDIP packaging but consumes higher current and targets +5V rails exclusively.
Availability
MAX814KEPA+ is available at Aetrix Electronics and suitable for medical equipment, industrial PLC modules, and portable battery-powered instrumentation requiring stable component supply with long-term lifecycle support.
Supply support for MAX814KEPA+ 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 demanding industrial, medical, and communications applications.
The MAX814 family delivers high-accuracy, low-power µP supervision for +5V systems where deterministic reset behavior, brownout immunity, and early power-fail warning are critical to system reliability.
FAQ
What is the exact reset threshold voltage of the MAX814KEPA+?
The MAX814KEPA+ has a factory-trimmed reset threshold of 4.80V ±1%, specified over the full commercial temperature range (0°C to +70°C). This value is confirmed in Maxim's official datasheet Section "Electrical Characteristics, +5V Parts" and applies to the K-suffix variant. The threshold remains stable across supply voltage, load, and temperature variations within datasheet limits, enabling robust system-level reset margin design.
Does the MAX814KEPA+ include a watchdog timer function?
No, the MAX814KEPA+ does not include a watchdog timer. Watchdog functionality is exclusive to the MAX815 series (e.g., MAX815KEPA+). The MAX814KEPA+ provides only power-on reset, manual reset, power-fail monitoring (PFI/PFO), and low-line detection (LOW LINE). Its block diagram and Selector Table in the Maxim datasheet confirm absence of WDI/WDO pins and watchdog circuitry.
Can the MAX814KEPA+ monitor a 3.3V supply rail?
Yes, the MAX814KEPA+ can monitor a 3.3V rail using its PFI input with an external resistor divider. Since its PFI comparator reference is fixed at 2.50V, a divider ratio of ~1.32:1 (e.g., 33kΩ top, 25kΩ bottom) sets the trip point near 3.3V × (25/(33+25)) ≈ 2.50V. The MAX814KEPA+ datasheet Figure 11 explicitly shows dual-rail monitoring, and electrical characteristics confirm PFI operation across VCC = 1.0V to 5.5V.
What is the purpose of the LOW LINE pin on the MAX814KEPA+?
The LOW LINE pin on the MAX814KEPA+ is an active-low output that asserts ~60mV above the 4.80V reset threshold (i.e., at ~4.86V), providing early warning of impending brownout. It enables µP firmware to execute critical shutdown tasks - such as saving configuration or flushing buffers - before RESET is asserted. The MAX814KEPA+ datasheet Section "LOW LINE Output (MAX814)" and Figure 9 timing diagram confirm its dedicated role and timing relationship to VCC.
Is the MAX814KEPA+ pin-compatible with other MAX814 variants like MAX814LEPA+?
Yes, the MAX814KEPA+ is fully pin-compatible with all MAX814 variants (L, N, T) in the same package - including MAX814LEPA+, MAX814NEPA+, and MAX814TEPA+. They share identical 8-pin PDIP pinout, electrical timing, and functional pin definitions. The only difference is the factory-set reset threshold voltage (4.80V for K, 4.70V for L, etc.), as documented in Maxim's Selector Table and Ordering Information sections.
MAX814KEPA+ 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:
- 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:
- Through Hole
- Supplier Device Package:
- 8-PDIP
MAX814KEPA+ FAQ
1.How can I place an order for MAX814KEPA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX814KEPA+ 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 MAX814KEPA+ reliable?
The price and inventory of MAX814KEPA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX814KEPA+ is usually 5 days.
3.What payment methods are accepted for MAX814KEPA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX814KEPA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX814KEPA+?
MAX814KEPA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX814KEPA+ 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 MAX814KEPA+?
For technical support, including MAX814KEPA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX814KEPA+ requirements.
6.How does Aetrix verify that MAX814KEPA+ is sourced from the original manufacturer or authorized distributors?
All MAX814KEPA+ 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 MAX814KEPA+ meets industry standards.
7.What is the process for return or replacement of MAX814KEPA+?
All MAX814KEPA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX814KEPA+, 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 MAX814KEPA+ part is unused and in its original packaging.
Return procedure for MAX814KEPA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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