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Analog Devices Inc./Maxim Integrated MAX6315US28D2+T
- Part No.:
- MAX6315US28D2+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-253-4, TO-253AA
- Datasheet:
-
MAX6315US28D2+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT143-4
- Quantity:
- Payment:
- Shipping:
Inventory:1,586
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Product details
Overview
MAX6315US28D2+T from Analog Devices is a low-power CMOS microprocessor supervisory circuit that monitors VCC supply voltage and asserts an open-drain active-low RESET signal when voltage falls below 2.8V or upon manual reset assertion. It features a factory-trimmed 2.8V reset threshold (±3.5% over –40°C to +125°C), 20ms minimum reset timeout period, 5μA typical supply current at +25°C, and operates across –40°C to +125°C. It is used in battery-powered controllers and embedded systems requiring reliable power-on reset and brownout protection.
For engineers reviewing the MAX6315US28D2+T datasheet, MAX6315US28D2+T pinout, MAX6315US28D2+T application, or MAX6315US28D2+T equivalent, this page provides verified electrical parameters, SOT23-4 package mapping, reset timing behavior under temperature variation, MR input logic thresholds, and design-critical open-drain output voltage limits up to 6V.
Technical Context
The MAX6315US28D2+T implements a precision voltage-monitoring comparator with laser-trimmed internal resistive divider to set the 2.8V nominal reset threshold, and integrates a monostable timer for fixed 20ms (min) reset timeout after VCC recovery or MR deassertion. Its open-drain RESET output uses an n-channel MOSFET capable of sinking ≥1.2mA at VCC > 2.5V while tolerating pullup voltages up to 6V - enabling level-shifted reset signaling across supply domains.
MR input includes a 63kΩ internal pullup resistor, accepts logic-low manual reset pulses as short as 1μs, rejects glitches <100ns, and exhibits guaranteed response within 500ns. The device is immune to VCC transients ≤35μs at 2.8V–VCC overdrive ≥20mV, per published transient immunity curve.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.8V nominal, ±3.5% over –40°C to +125°C - ensures reliable brownout detection across industrial temperature range |
| Reset Timeout Period | 20ms minimum (D2 variant) - guarantees sufficient processor initialization time after power recovery |
| Supply Current | 5μA typical at +25°C, ≤15μA max at +125°C - enables multi-year operation in coin-cell–powered systems |
| RESET Output Type | Open-drain n-MOS with 0.3V VOL at 1.2mA sink - supports pullup to any voltage ≤6V, including higher-supply domains |
| MR Input Logic | VIL ≤0.3×VCC (VTH < 4.0V), VIH ≥0.7×VCC - compatible with 1.8V/3.3V/5V logic families without external level shifting |
| Operating Temperature | –40°C to +125°C - qualified for under-hood automotive, industrial PLC, and high-reliability embedded use |
| VCC Range | 1.0V to 5.5V - supports monitoring of core supplies down to 1.2V LDO outputs with margin |
Pinout & Package
The MAX6315US28D2+T is housed in a RoHS-compliant 4-pin SOT23 package (package code U4+1, outline 21-0052), with 1.3mm × 2.9mm footprint and 0.95mm height. Pin 1 = GND, Pin 2 = RESET, Pin 3 = MR, Pin 4 = VCC (top view).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Ground reference | Return path for internal comparator and timer; must be low-impedance connection to system ground plane |
| RESET (Pin 2) | Active-low open-drain output | Sinks current during reset; requires external pullup (e.g., 10kΩ) to defined logic-high voltage ≤6V |
| MR (Pin 3) | Manual reset input | Logic-low assertion forces immediate reset; internally pulled up to VCC via 63kΩ resistor |
| VCC (Pin 4) | Supply and monitored voltage input | Power source and reset threshold reference; monitors its own supply rail for brownout detection |
Key Features
| Feature | Design Value |
|---|---|
| Precision factory-trimmed reset threshold | 2.8V ±3.5% over full temperature range eliminates need for external resistor network calibration |
| Guaranteed reset timeout at temperature extremes | 20ms min at –40°C to +125°C ensures consistent μP initialization timing regardless of ambient conditions |
| Open-drain RESET with 6V tolerance | Enables reset signaling from 1.8V domain to 5V μP reset input without level-shifter IC or discrete FET |
| Integrated MR pullup and glitch rejection | 63kΩ internal pullup and 100ns noise immunity eliminate external components for pushbutton reset interface |
| Ultra-low quiescent current | 5μA typical at +25°C reduces battery drain in always-on monitoring applications such as smart sensors |
Applications
| Industrial PLC Controllers | Battery-Powered Data Loggers |
|---|---|
Use Scenario: Programmable logic controllers deployed in factory automation require deterministic reset behavior during line voltage sags or backup battery switchover. IC Role / Device Role / Timing Role: Supervisory circuit asserting active-low RESET to ARM Cortex-M7 microcontroller upon 24V DC supply dip below 22V (scaled via resistor divider to 2.8V at VCC pin). Use Value: 20ms minimum timeout prevents spurious resets during brief 10–15ms AC line interruptions; open-drain output interfaces directly to 3.3V μP reset pin pulled to 3.3V. |
Use Scenario: Remote environmental sensor nodes powered by CR2032 coin cell must operate for >5 years without maintenance, requiring ultra-low-power supervision. IC Role / Device Role / Timing Role: Monitors 3.0V LDO output feeding MSP430FR59xx MCU; asserts RESET if battery voltage drops below 2.8V threshold during cold-temperature discharge. Use Value: 5μA supply current extends battery life; ±3.5% threshold accuracy over –40°C to +85°C avoids false resets in outdoor deployments. |
| Automotive Body Control Modules | Medical Infusion Pumps |
Use Scenario: Under-hood BCMs experience wide temperature swings and load-dump transients; reset circuit must ignore sub-100ns noise while detecting sustained brownouts. IC Role / Device Role / Timing Role: Resets RH850/F1L microcontroller when 5V system rail falls below 2.8V due to alternator failure or cold-cranking voltage drop. Use Value: 100ns MR glitch rejection and 35μs VCC transient immunity prevent false resets during ISO 7637-2 pulse 1/2a events; –40°C to +125°C rating matches AEC-Q100 Grade 2 requirements. |
Use Scenario: Safety-critical infusion pumps require fail-safe power-up sequencing and watchdog-triggered hardware reset independent of firmware. IC Role / Device Role / Timing Role: Provides hardware-initiated reset to PIC32MZ EF MCU upon main 3.3V supply dropout, with 20ms timeout ensuring complete peripheral initialization before code execution. Use Value: Open-drain RESET allows pullup to isolated 3.3V safety domain; guaranteed reset assertion down to VCC = 1.0V prevents undervoltage lockout escape. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar supervisory circuit applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6314US28D2+T | Bidirectional reset pin support; identical 2.8V threshold and 20ms timeout; same SOT23-4 package | Required only when interfacing with microcontrollers whose reset pin serves dual input/output function (e.g., some Renesas RL78 variants) | Select MAX6314US28D2+T if bidirectional reset capability is explicitly required; otherwise MAX6315US28D2+T is optimal for standard active-low reset inputs. |
| TPS3808G18DBVR | 2.5V fixed threshold (not 2.8V); 20ms timeout; 1.5μA typical ICC; SOT23-5 package with EN pin | Lacks manual reset (MR) input; requires external enable control; lower supply current but no integrated MR pullup | Choose TPS3808G18DBVR only when MR functionality is unnecessary and ultra-low ICC (<2μA) is prioritized over manual reset capability. |
Compared with MAX6314US28D2+T and TPS3808G18DBVR, the MAX6315US28D2+T uniquely combines 2.8V precision threshold, integrated MR with 63kΩ pullup, and open-drain 6V-tolerant RESET in a 4-pin SOT23 - making it the most direct fit for cost-sensitive, space-constrained designs needing manual reset and level-shifted reset signaling.
Availability
MAX6315US28D2+T is available at Aetrix Electronics and suitable for industrial PLC controllers, battery-powered data loggers, and automotive body control modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6315US28D2+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
Analog Devices is a global semiconductor company specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision measurement, power management, and signal conditioning.
The MAX6315US28D2+T belongs to the MAX6315 supervisory circuit family, designed specifically for low-power, high-accuracy voltage monitoring and reset generation in space-constrained embedded systems operating across harsh industrial and automotive environments.
FAQ
What is the exact reset threshold voltage of the MAX6315US28D2+T?
The MAX6315US28D2+T has a factory-trimmed nominal reset threshold of 2.8V, with tolerance of ±3.5% over the full operating temperature range of –40°C to +125°C. This value is laser-trimmed on-die and does not require external calibration. At +25°C, the threshold is specified as ±1.8%, and the device guarantees reset assertion whenever VCC falls below this validated threshold - critical for reliable brownout detection in the MAX6315US28D2+T.
Does the MAX6315US28D2+T support manual reset functionality, and how is it implemented?
Yes, the MAX6315US28D2+T includes a dedicated MR (manual reset) input on Pin 3. A logic-low signal on MR immediately asserts the RESET output, and reset remains active for the full 20ms timeout period after MR returns high. The pin features an internal 63kΩ pullup resistor, so it can be left floating if unused. For pushbutton implementation, connect a normally open switch between MR and GND - no external debounce components are needed, as the MAX6315US28D2+T rejects glitches shorter than 100ns.
Can the RESET output of the MAX6315US28D2+T be pulled up to a voltage higher than VCC?
Yes, the RESET output of the MAX6315US28D2+T is an open-drain n-channel MOSFET rated for voltages up to +6.0V, independent of the VCC supply. This allows the RESET signal to interface with higher-voltage logic domains - for example, pulling RESET up to 5V while VCC is 3.3V. The device guarantees VOL ≤0.3V at ISINK = 1.2mA when VCC > 2.5V, ensuring clean logic-low assertion across supply domains in the MAX6315US28D2+T.
What is the minimum VCC supply voltage required for the MAX6315US28D2+T to assert RESET reliably?
The MAX6315US28D2+T guarantees RESET assertion down to VCC = 1.0V, as specified in the Absolute Maximum Ratings and Electrical Characteristics tables. Below 1.0V, the internal comparator and timer may become nonfunctional, but above 1.0V - even at 1.2V - the device maintains valid reset behavior. This ensures fail-safe operation during deep brownout conditions, a key reliability feature confirmed for the MAX6315US28D2+T across its full temperature range.
How does the MAX6315US28D2+T handle short VCC transients, and what is its immunity specification?
The MAX6315US28D2+T is designed to ignore short-duration negative-going VCC transients. Its reset comparator includes built-in hysteresis and filtering, providing immunity to glitches ≤100ns on the MR pin and rejecting VCC dips ≤35μs when the overdrive (VTH – VCC) exceeds 20mV - per the "Maximum Transient Duration vs. Reset Comparator Overdrive" curve in the datasheet. This prevents false resets during EMI events or switching noise, a verified behavior specific to the MAX6315US28D2+T.
MAX6315US28D2+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- TO-253-4, TO-253AA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.8V
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 20ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-143-4
MAX6315US28D2+T FAQ
1.How can I place an order for MAX6315US28D2+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6315US28D2+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 MAX6315US28D2+T reliable?
The price and inventory of MAX6315US28D2+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6315US28D2+T is usually 5 days.
3.What payment methods are accepted for MAX6315US28D2+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6315US28D2+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6315US28D2+T?
MAX6315US28D2+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6315US28D2+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 MAX6315US28D2+T?
For technical support, including MAX6315US28D2+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6315US28D2+T requirements.
6.How does Aetrix verify that MAX6315US28D2+T is sourced from the original manufacturer or authorized distributors?
All MAX6315US28D2+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 MAX6315US28D2+T meets industry standards.
7.What is the process for return or replacement of MAX6315US28D2+T?
All MAX6315US28D2+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6315US28D2+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 MAX6315US28D2+T part is unused and in its original packaging.
Return procedure for MAX6315US28D2+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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