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Analog Devices Inc./Maxim Integrated MAX6312EUK46D3+
- Part No.:
- MAX6312EUK46D3+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6312EUK46D3+.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:763
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Product details
Overview
The MAX6312EUK46D3+ from Maxim Integrated is a precision 5-pin SOT23 programmable supervisory circuit that monitors VCC and an external undervoltage input (RST IN), asserts active-high push/pull RESET when either falls below threshold, features factory-set 4.63V VCC reset threshold (±2.5% over -40°C to +85°C), 140ms min reset timeout, and 8µA supply current - ideal for multivoltage embedded systems requiring reliable power-on and brownout reset.
For engineers reviewing the MAX6312EUK46D3+ datasheet, MAX6312EUK46D3+ pinout, MAX6312EUK46D3+ application, or MAX6312EUK46D3+ equivalent, key selection considerations include its guaranteed RESET validity down to VCC = 1V, manual-reset input with internal 63.5kΩ pull-up, immunity to fast VCC transients, and compatibility with 3.3V/5V mixed-rail systems.
Technical Context
This device implements a dual-monitoring architecture: one path uses an internal factory-trimmed resistor divider to monitor VCC against a 4.63V nominal threshold; the second path compares an external voltage at RST IN against a precise 1.23V internal reference. Both paths feed into a shared reset generator with a fixed 140ms minimum timeout period after all monitored voltages recover.
The MAX6312EUK46D3+ employs an active-high push/pull RESET output capable of sourcing 150µA at VCC ≥ 1.8V and sinking 1.2mA at VCC ≥ 2.5V, eliminating need for external pull-up resistors. Its MR input accepts TTL- or CMOS-level signals and includes glitch rejection (0.1µs) and 1.5µs minimum pulse width guarantee over full temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 4.63V ±2.5% over -40°C to +85°C - ensures reliable detection of 5V rail collapse before microprocessor malfunction |
| Reset Timeout Period | 140ms minimum - provides sufficient hold time for CPU initialization and peripheral stabilization |
| Supply Current | 8µA typical at +25°C - enables use in battery-powered portable equipment with multi-year standby life |
| RESET Output Type | Active-high push/pull - drives logic inputs directly without external components; valid down to VCC = 1V |
| RST IN Threshold | 1.23V ±0.03V - allows precise external undervoltage monitoring via resistor divider (e.g., 3.3V, 2.5V rails) |
| MR Input Logic | TTL-compatible low threshold (0.3×VCC) and CMOS-compatible high threshold (0.7×VCC) - supports direct interface to diverse controller I/O |
| Operating Temp Range | -40°C to +85°C - qualified for industrial and automotive under-hood environments |
Pinout & Package
MAX6312EUK46D3+ is housed in a lead-free 5-pin SOT23 package (outline U5+1), measuring 2.9mm × 1.6mm × 1.1mm, optimized for space-constrained PCB layouts and reflow-compatible assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET | Active-high push/pull reset output | Drives microcontroller reset pin directly; sinks 1.2mA at VCC ≥ 2.5V, sources 150µA at VCC ≥ 1.8V |
| 2 - GND | System ground reference | Return path for all internal comparators and output driver; must be low-impedance connection |
| 3 - RST IN | Adjustable undervoltage reset input | Compares external voltage to 1.23V reference; used to monitor secondary supply (e.g., 3.3V, 2.5V) |
| 4 - MR | Manual reset input | Pull low to force reset; internal 63.5kΩ pull-up allows floating connection if unused |
| 5 - VCC | Main supply input and primary monitor | Power source and monitored rail; internal divider sets 4.63V reset threshold; operates from 1.0V to 5.5V |
Key Features
| Feature | Design Value |
|---|---|
| Factory-programmed 4.63V VCC threshold | Eliminates external resistor network; reduces BOM count and layout area vs. adjustable supervisors |
| 140ms minimum reset timeout | Guarantees CPU and memory initialization completion before release; avoids premature firmware execution |
| Immunity to fast VCC transients | Rejects sub-200ns negative glitches up to 100mV overdrive - prevents spurious resets in noisy power environments |
| Guaranteed RESET validity to VCC = 1V | Ensures deterministic reset assertion during deep brownout; critical for fail-safe shutdown sequencing |
| Manual reset with internal pull-up | Enables momentary switch interface without external components; simplifies front-panel or debug reset implementation |
Applications
| Industrial PLC Controller | Medical Portable Monitor |
|---|---|
Use Scenario: Monitors both 5V main logic rail and 3.3V sensor interface rail in a DIN-rail mounted programmable logic controller. IC Role / Device Role / Timing Role: Dual-supply supervisor asserting active-high RESET to ARM Cortex-M7 MCU upon any rail dropout. Use Value: Prevents corrupted I/O state during 5V/3.3V cross-rail brownout; 140ms timeout ensures FPGA configuration completes before firmware boot. | Use Scenario: Ensures safe startup and fault recovery in a battery-powered ECG monitor with isolated analog front-end and Bluetooth LE radio. IC Role / Device Role / Timing Role: Primary reset generator monitoring 3.3V system rail and 1.8V ADC reference rail via RST IN divider. Use Value: 8µA quiescent current extends battery life; MR pin enables clinician-initiated recalibration reset without PCB redesign. |
| Automotive Body Control Module | Network Edge Router |
Use Scenario: Supervises 5V microcontroller supply and 12V CAN transceiver bias in under-hood body control unit operating from 12V battery with wide input variation. IC Role / Device Role / Timing Role: VCC monitor (4.63V threshold) detects 5V regulator failure; RST IN monitors 12V rail via resistor divider for overvoltage protection. Use Value: -40°C to +85°C rating ensures operation across automotive ambient range; transient immunity prevents false resets during load-dump events. | Use Scenario: Provides robust power-on reset for dual-core MIPS processor and DDR3 memory subsystem in enterprise-grade edge router with 3.3V/1.5V/1.2V rails. IC Role / Device Role / Timing Role: Primary supervisor on 3.3V auxiliary rail; RST IN configured to monitor 1.5V DDR termination voltage. Use Value: Push/pull RESET eliminates need for pull-up on high-capacitance reset bus; 140ms timeout accommodates DDR3 initialization sequence. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar supervisory circuit applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6312EUK46D2+ | 20ms minimum reset timeout vs. 140ms; otherwise identical electrical specs and pinout | Suitable for faster-booting systems where shorter reset hold time is acceptable | Select D2+ variant only if system firmware initializes in <20ms and no peripherals require extended reset assertion |
| TPS3808G33DBVR | 3.3V fixed VCC threshold (not 4.63V); 200ms timeout; 1.8µA supply current; SOT23-6 package | Lacks RST IN input and manual reset; optimized for single-rail 3.3V systems | Use only when monitoring only one supply and 3.3V threshold suffices; requires PCB footprint change |
Compared with MAX6312EUK46D2+, the MAX6312EUK46D3+ provides longer reset hold time for complex peripherals; compared with TPS3808G33DBVR, it offers dual-supply monitoring and manual reset in same footprint but consumes higher quiescent current.
Availability
MAX6312EUK46D3+ is available at Aetrix Electronics and suitable for industrial PLC controllers, medical portable monitors, automotive body control modules, and network edge routers requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6312EUK46D3+ 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 power management, sensing, and interface applications in industrial, automotive, and communications markets.
The MAX6305–MAX6313 family delivers highly accurate, low-power supervisory circuits with factory-programmed thresholds and multiple monitoring inputs - engineered specifically for reliability-critical embedded systems demanding deterministic reset behavior across voltage and temperature extremes.
FAQ
What is the exact factory-set VCC reset threshold for MAX6312EUK46D3+?
The MAX6312EUK46D3+ has a nominal VCC reset threshold of 4.63V, with tolerance of ±2.5% over the full operating temperature range (-40°C to +85°C). This value is factory-trimmed using an internal resistor divider and corresponds to the "46" in the part number per Table 1 of the datasheet. The actual measured threshold at +25°C falls between 4.514V and 4.746V.
Does MAX6312EUK46D3+ support monitoring of a secondary voltage rail?
Yes, MAX6312EUK46D3+ supports secondary rail monitoring via its RST IN pin, which compares an external voltage to a precise 1.23V internal reference. By connecting a resistor divider from the secondary rail (e.g., 3.3V or 2.5V) to RST IN, the device asserts RESET if that rail falls below the programmed threshold - enabling true dual-supply supervision in a single 5-pin package.
What is the function of the MR pin on MAX6312EUK46D3+ and how should it be used?
The MR (Manual Reset) pin on MAX6312EUK46D3+ is an active-low input that forces RESET assertion when pulled below 0.3×VCC. It features an internal 63.5kΩ pull-up resistor, so it may be left unconnected for normal operation. For manual reset, connect a normally open momentary switch from MR to GND; no external debounce circuitry is required due to built-in 0.1µs glitch rejection.
Can MAX6312EUK46D3+ operate reliably during fast VCC transients?
Yes, MAX6312EUK46D3+ is specifically designed to ignore fast VCC transients. The device guarantees immunity to negative-going glitches as short as 0.1µs and up to 100mV in amplitude below the 4.63V threshold. This is confirmed by the "Maximum Transient Duration vs. VCC Reset Threshold Overdrive" graph in the datasheet, ensuring no spurious resets in electrically noisy environments.
What are the absolute minimum and maximum supply voltage limits for MAX6312EUK46D3+?
MAX6312EUK46D3+ operates with VCC from 1.0V to 5.5V. Its RESET output remains valid down to VCC = 1.0V, and the device guarantees proper reset assertion even when VCC drops to this level. The upper limit of 5.5V is the absolute maximum rating; sustained operation above 5.5V risks permanent damage per the Absolute Maximum Ratings table.
MAX6312EUK46D3+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 4.63V, Adj
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active High
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6312EUK46D3+ FAQ
1.How can I place an order for MAX6312EUK46D3+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6312EUK46D3+ 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 MAX6312EUK46D3+ reliable?
The price and inventory of MAX6312EUK46D3+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6312EUK46D3+ is usually 5 days.
3.What payment methods are accepted for MAX6312EUK46D3+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6312EUK46D3+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6312EUK46D3+?
MAX6312EUK46D3+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6312EUK46D3+ 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 MAX6312EUK46D3+?
For technical support, including MAX6312EUK46D3+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6312EUK46D3+ requirements.
6.How does Aetrix verify that MAX6312EUK46D3+ is sourced from the original manufacturer or authorized distributors?
All MAX6312EUK46D3+ 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 MAX6312EUK46D3+ meets industry standards.
7.What is the process for return or replacement of MAX6312EUK46D3+?
All MAX6312EUK46D3+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6312EUK46D3+, 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 MAX6312EUK46D3+ part is unused and in its original packaging.
Return procedure for MAX6312EUK46D3+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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