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Analog Devices Inc./Maxim Integrated MAX6312EUK46D3+T
- Part No.:
- MAX6312EUK46D3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6312EUK46D3+T.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:15,000
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Product details
Overview
The MAX6312EUK46D3+T from Maxim Integrated is a precision 5-pin SOT23 programmable reset IC designed to monitor VCC and an external undervoltage input (RST IN) while providing manual-reset capability. It features a factory-set 4.63V ±2.5% VCC reset threshold, 140ms minimum reset timeout, push/pull active-high RESET output, and operates across -40°C to +85°C. Used in multivoltage embedded systems for reliable power-on and brownout reset assertion.
For engineers reviewing the MAX6312EUK46D3+T datasheet, MAX6312EUK46D3+T pinout, MAX6312EUK46D3+T application, or MAX6312EUK46D3+T equivalent, key selection criteria include its guaranteed RESET validity down to VCC = 1.0V, immunity to fast VCC transients ≤100ns at 4.63V overdrive, 8µA supply current at 5.5V, and compatibility with 3.3V/5V dual-rail monitoring in portable industrial controllers.
Technical Context
This device implements a dual-monitoring architecture: one internal factory-trimmed voltage divider monitors VCC against a 4.63V threshold, while a separate comparator monitors an external RST IN signal referenced to a 1.23V internal bandgap. The manual-reset (MR) input includes a 63.5kΩ internal pull-up and guarantees reset assertion during MR low plus full tRP after release.
Its push/pull active-high RESET output sources ≥0.8×VCC at 150µA (VCC > 1.8V) and sinks ≥500µA at VOL ≤0.3V, enabling direct interface with µP reset inputs without external pull-ups. Reset deassertion occurs only after all monitored supplies exceed thresholds and the 140ms timeout elapses - with timer restart on any subsequent threshold violation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 4.63V ±2.5% over -40°C to +85°C - sets precise brownout detection point for 5V rails |
| Reset Timeout Period | 140ms (min) - ensures µP initialization completes before release; factory-programmed, no external RC needed |
| Supply Current | 8µA (typ) at VCC = 5.5V - enables multi-year battery life in portable equipment |
| RESET Output Type | Active-high push/pull - drives µP reset pins directly; no external pull-up required |
| Operating Temperature | -40°C to +85°C - qualified for industrial and automotive under-hood environments |
| MR Input Logic | TTL/CMOS-compatible with 63.5kΩ internal pull-up - supports momentary switch or logic-level reset initiation |
| VCC Range | 1.0V to 5.5V - asserts valid RESET down to 1.0V, supporting graceful shutdown sequencing |
Pinout & Package
Package: 5-pin SOT23 (U5+1), RoHS-compliant lead-free, 1.6mm × 2.9mm footprint, 1.1mm height.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET | Active-high push/pull reset output | Drives µP reset pin high during fault; sinks 500µA @ 0.3V, sources 150µA @ 0.8×VCC |
| 2 - GND | System ground reference | Return path for all internal comparators and output stage; must be low-impedance |
| 3 - RST IN | Adjustable undervoltage reset input | Compares external voltage to 1.23V reference; asserts reset when VIN falls below programmed threshold |
| 4 - MR | Manual-reset input | Pull low to force reset; internal 63.5kΩ pull-up allows switch-to-GND implementation |
| 5 - VCC | Supply and primary monitored rail | Power source and input to internal 4.63V threshold detector; also enables internal circuitry |
Key Features
| Feature | Design Value |
|---|---|
| Factory-set 4.63V VCC threshold | Eliminates external resistor dividers for 5V rail monitoring; ±2.5% tolerance over full temperature range |
| 140ms factory-programmed timeout | Guarantees sufficient µP boot time without timing capacitor drift or layout sensitivity |
| Immunity to VCC transients | Rejects <100ns negative glitches at 4.63V overdrive - prevents spurious resets in noisy power domains |
| Valid RESET to VCC = 1.0V | Ensures deterministic reset state during deep brownout or controlled power-down sequences |
| Integrated MR pull-up | Reduces BOM count by eliminating external resistor; supports direct switch connection to GND |
Applications
| Industrial PLC I/O Module | Medical Portable Monitor |
|---|---|
Use Scenario: Monitors both 5V system rail and 3.3V microcontroller core supply in a DIN-rail mounted controller with isolated field I/O. IC Role / Device Role / Timing Role: Dual-supply supervisor asserting active-high RESET to ARM Cortex-M7 during VCC dip or RST IN fault; 140ms timeout aligns with FPGA configuration time. Use Value: Prevents firmware corruption during 24V AC line sags by holding µP in reset until both rails stabilize above 4.63V and 3.0V thresholds. | Use Scenario: Powers a battery-backed ECG front-end with real-time display, requiring fail-safe reset during Li-ion discharge from 4.2V to 3.0V. IC Role / Device Role / Timing Role: VCC monitor (4.63V) detects main 5V DC-DC failure; RST IN tracks 3.3V analog supply; MR enables clinician-initiated recalibration reset. Use Value: 8µA quiescent current extends single-charge runtime by >12 hours; 140ms timeout avoids display flicker during brief battery switchover. |
| Automotive Body Control Module | Smart Energy Meter |
Use Scenario: Supervises 5V CAN transceiver supply and 3.3V MCU rail in under-hood junction box exposed to load dump and cold cranking. IC Role / Device Role / Timing Role: Resets Infineon AURIX TC3xx upon VCC dropout below 4.63V; MR tied to ignition switch for cold-start reinitialization. Use Value: -40°C to +85°C rating ensures operation during extreme ambient swings; transient immunity prevents false resets during ISO 7637-2 pulse 5a. | Use Scenario: Secures metering SoC (e.g., STPM3x) during AC mains interruption and backup supercapacitor discharge. IC Role / Device Role / Timing Role: VCC (4.63V) monitors 5V LDO output; RST IN watches 3.3V RTC rail; RESET holds meter in safe state during 200ms grid dropout. Use Value: Guaranteed RESET validity to VCC = 1.0V maintains secure shutdown state as supercapacitor decays from 5V to 1.8V. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar programmable reset IC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6312EUK46D2+T | 20ms (min) reset timeout vs. 140ms (min) for MAX6312EUK46D3+T | Suitable for fast-boot µPs (e.g., RISC-V cores) where shorter reset hold time is acceptable | Select when system boot completes in <25ms and faster recovery from brownout is prioritized over noise margin |
| TPS3808G33DBVR | Fixed 3.3V threshold (not 4.63V); 200ms timeout; open-drain output (not push/pull) | Requires external pull-up; limited to single-rail 3.3V monitoring without RST IN flexibility | Choose only if redesigning for fixed 3.3V rail supervision and board space permits pull-up resistor |
Compared with MAX6312EUK46D2+T and TPS3808G33DBVR, the MAX6312EUK46D3+T uniquely combines 4.63V precision VCC monitoring, 140ms timeout, active-high push/pull output, and dual-input (VCC + RST IN) supervision - making it optimal for 5V-centric industrial controllers requiring deterministic long-duration reset hold.
Availability
MAX6312EUK46D3+T is available at Aetrix Electronics and suitable for industrial PLCs, portable medical devices, automotive body control modules, and smart energy meters requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6312EUK46D3+T 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, automotive, and computing applications, emphasizing reliability, low power, and integration.
The MAX6305–MAX6313 family delivers programmable supervisory circuits targeting multivoltage embedded systems where simultaneous monitoring of primary and auxiliary rails with factory-trimmed accuracy is critical.
FAQ
What is the exact factory-programmed reset threshold voltage for MAX6312EUK46D3+T?
The MAX6312EUK46D3+T has a factory-programmed VCC reset threshold of 4.63V, with ±2.5% tolerance over the full operating temperature range (-40°C to +85°C). This value is confirmed in Table 1 of the datasheet and corresponds to the "46" suffix in the part number. The threshold is set via an internal trimmed voltage divider and requires no external components.
Does MAX6312EUK46D3+T support monitoring of a secondary voltage rail besides VCC?
Yes, the MAX6312EUK46D3+T includes a dedicated RST IN pin that monitors an external undervoltage condition using an internal 1.23V reference. By connecting a resistor divider to RST IN, users can program a second reset threshold independent of the 4.63V VCC threshold - enabling dual-rail supervision (e.g., 5V + 3.3V) in a single SOT23-5 package.
What is the function and electrical behavior of the MR pin on MAX6312EUK46D3+T?
The MR (manual-reset) pin on MAX6312EUK46D3+T is an active-low input with an internal 63.5kΩ pull-up resistor. Pulling MR low forces RESET high for the duration of the low signal plus the full 140ms timeout period. It accepts TTL/CMOS logic levels and supports direct connection to a momentary switch to GND - no external components are required for basic manual reset functionality.
Can MAX6312EUK46D3+T guarantee valid RESET output when VCC drops below 1.5V?
Yes, the MAX6312EUK46D3+T guarantees valid RESET output down to VCC = 1.0V, as specified in the Electrical Characteristics table. Unlike some supervisors that lose output drive below 1.5V, this device maintains active-high RESET assertion with defined VOL and VOH performance even at 1.0V, supporting controlled shutdown in ultra-low-power brownout scenarios.
Is MAX6312EUK46D3+T compatible with both 3.3V and 5V microcontroller reset inputs?
Yes, the MAX6312EUK46D3+T's push/pull active-high RESET output is compatible with both 3.3V and 5V µP reset inputs. When VCC ≥ 1.8V, it sources ≥0.8×VCC at 150µA - delivering ~2.64V at 3.3V supply and ~4.0V at 5.0V supply - meeting standard VIH requirements for common µPs without level-shifting or external pull-ups.
MAX6312EUK46D3+T 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+T FAQ
1.How can I place an order for MAX6312EUK46D3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6312EUK46D3+T 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+T reliable?
The price and inventory of MAX6312EUK46D3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6312EUK46D3+T is usually 5 days.
3.What payment methods are accepted for MAX6312EUK46D3+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6312EUK46D3+T transactions.
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4.How is shipping managed for MAX6312EUK46D3+T?
MAX6312EUK46D3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6312EUK46D3+T 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+T?
For technical support, including MAX6312EUK46D3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6312EUK46D3+T requirements.
6.How does Aetrix verify that MAX6312EUK46D3+T is sourced from the original manufacturer or authorized distributors?
All MAX6312EUK46D3+T 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+T meets industry standards.
7.What is the process for return or replacement of MAX6312EUK46D3+T?
All MAX6312EUK46D3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6312EUK46D3+T, 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+T part is unused and in its original packaging.
Return procedure for MAX6312EUK46D3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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