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Analog Devices Inc./Maxim Integrated MAX6309UK29D3-T
- Part No.:
- MAX6309UK29D3-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6309UK29D3-T.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,430
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Product details
Overview
MAX6309UK29D3-T from Maxim Integrated is a 5-pin SOT23 programmable supervisory IC that monitors VCC (factory-set threshold 2.93V ±2.5%) and an external undervoltage input (RST IN_), asserts active-low push/pull RESET during brownout or manual reset, and provides 140ms minimum reset timeout. It draws only 8µA supply current and guarantees valid RESET output down to VCC = 1V - ideal for dual-rail 3.3V/5V embedded control systems requiring robust power-on sequencing.
For engineers reviewing the MAX6309UK29D3-T datasheet, MAX6309UK29D3-T pinout, MAX6309UK29D3-T application, or MAX6309UK29D3-T equivalent, key selection criteria include its factory-trimmed 2.93V VCC threshold, 140ms timeout (D3), push/pull RESET drive capability, MR input with internal 63.5kΩ pull-up, and immunity to fast VCC transients up to 100V/µs.
Technical Context
The MAX6309UK29D3-T integrates a factory-trimmed voltage divider to monitor VCC against a precise 2.93V threshold (±2.5% over -0°C to +70°C), while also accepting an external resistor-divider–programmed undervoltage signal on RST IN_. Its push/pull RESET output sources/sinks current (VOH = 0.8×VCC at ISOURCE = 500µA; VOL = 0.3V at ISINK = 1.2mA), eliminating external pull-up components.
It features a manual-reset input (MR) with TTL/CMOS-compatible logic thresholds, guaranteed 1.5µs minimum pulse width, and internal 63.5kΩ pull-up - enabling momentary switch interfacing without external biasing. The device ignores short VCC transients (≤100ns at 10mV overdrive) and maintains reset assertion until all monitored supplies exceed their thresholds plus full timeout delay.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 2.93V ±2.5% (factory-trimmed; enables precise 3.3V rail monitoring) |
| Reset Timeout Period | 140ms minimum (D3 index; ensures sufficient µP initialization time) |
| Supply Current | 8µA typical at VCC = 5.5V (enables battery-powered portable operation) |
| RESET Output Type | Active-low push/pull (drives high/low without external pull-up; supports direct µP interface) |
| MR Input Pull-up | 63.5kΩ internal (allows direct switch-to-GND connection; no external resistor needed) |
| Operating Temperature | 0°C to +70°C (commercial-grade stability for industrial control and computing) |
| VCC Valid Range | 1.0V to 5.5V (guarantees RESET assertion integrity down to brownout edge) |
Pinout & Package
MAX6309UK29D3-T is housed in a 5-pin SOT23 package (outline U5+1, land pattern 90-0174), optimized for space-constrained PCB layouts and reflow-compatible assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET | Active-low push/pull reset output | Drives low to assert reset; drives high to deassert - eliminates need for external pull-up resistor |
| 2 - GND | System ground reference | Common return path for internal comparators, MR, and RESET driver |
| 3 - RST IN | Adjustable undervoltage reset input | Accepts external resistor divider; asserts reset when input falls below 1.23V threshold |
| 4 - MR | Manual reset input | Logic-low active; internal 63.5kΩ pull-up enables direct SPST switch interface |
| 5 - VCC | Main supply and monitored rail | Power source and primary supervision target (2.93V threshold); operates down to 1.0V |
Key Features
| Feature | Design Value |
|---|---|
| Precision VCC threshold | 2.93V ±2.5% over temperature - ensures reliable 3.3V system reset without calibration |
| Push/pull RESET output | Eliminates external pull-up resistor and reduces BOM count in µP reset circuits |
| Transient-immune supervision | Immune to VCC glitches ≤100ns (at 10mV overdrive) - prevents spurious resets in noisy environments |
| Guaranteed RESET validity | RESET remains valid down to VCC = 1.0V - supports safe brownout detection before µP lockup |
| No external timing components | Factory-programmed 140ms timeout (D3) removes capacitor tolerance and aging concerns |
Applications
| Industrial PLC I/O Module | Medical Point-of-Care Monitor |
|---|---|
|
Use Scenario: Monitors 3.3V microcontroller supply and 5V analog front-end rails in a compact, battery-backed diagnostic device. IC Role / Device Role / Timing Role: Supervisory IC asserting active-low RESET to ARM Cortex-M4 during power-up, brownout, or user-initiated recovery. Use Value: Factory-trimmed 2.93V threshold matches 3.3V rail tolerance; 140ms timeout exceeds µP boot ROM requirement; MR input enables front-panel reset button. |
Use Scenario: Ensures deterministic restart of a low-power ECG acquisition subsystem after AC power interruption or battery swap. IC Role / Device Role / Timing Role: Dual-supply supervisor monitoring both main 5V DC-DC output and isolated 3.3V sensor interface rail. Use Value: Immunity to fast transients prevents false resets during relay switching; 8µA quiescent current extends battery life between calibrations. |
| Automotive Body Control Unit | Networked Smart Sensor Node |
|
Use Scenario: Provides fail-safe reset for an MCU managing door locks, lighting, and CAN transceivers in 12V vehicle electrical architecture. IC Role / Device Role / Timing Role: Primary VCC supervisor (2.93V) with secondary RST IN_ monitoring 5V CAN bus regulator output. Use Value: Push/pull RESET directly drives automotive-grade µP reset pin without level-shifting; guaranteed operation to +70°C meets under-hood ambient spec. |
Use Scenario: Manages power-on sequencing and brownout recovery for an IEEE 802.15.4 wireless sensor node powered by energy harvesting. IC Role / Device Role / Timing Role: Low-current supervisor ensuring µC reset integrity across variable input (2.5–5.5V) from supercapacitor or solar cell. Use Value: Valid RESET down to VCC = 1.0V enables graceful shutdown before energy depletion; MR input supports remote firmware recovery via GPIO. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar supervisory IC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6306UK29D3-T | Open-drain RESET output (vs. push/pull); identical VCC threshold, timeout, and MR functionality | Requires external pull-up resistor; unsuitable where µP reset pin lacks internal pull-up or demands active drive | Select MAX6306UK29D3-T only if board layout already includes pull-up or µP supports open-drain reset |
| TPS3808G33DBVR | Fixed 3.3V threshold (not 2.93V); 200ms timeout (D2); 1.6µA supply current; SOT23-6 package | Lacks RST IN_ input and MR; designed for single-rail 3.3V systems without auxiliary monitoring or manual reset | Choose TPS3808G33DBVR only for cost-sensitive, single-supply designs where 2.93V precision and dual-input supervision are unnecessary |
Compared with MAX6309UK29D3-T, MAX6306UK29D3-T requires external biasing and offers weaker drive strength, while TPS3808G33DBVR omits critical features like RST IN_ monitoring and manual reset - making MAX6309UK29D3-T uniquely suited for multirail, field-serviceable embedded systems.
Availability
MAX6309UK29D3-T is available at Aetrix Electronics and suitable for industrial control systems, medical diagnostics equipment, and automotive body electronics requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX6309UK29D3-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 demanding industrial, computing, and communications applications.
The MAX6305–MAX6313 family delivers programmable, multirail power supervision with factory-set thresholds and timeouts - engineered specifically for reliable µP reset generation in portable, multivoltage, and noise-prone embedded systems.
FAQ
What is the exact factory-programmed VCC reset threshold for MAX6309UK29D3-T?
The MAX6309UK29D3-T has a factory-trimmed VCC reset threshold of 2.93V, with ±2.5% tolerance over the 0°C to +70°C operating range. This value corresponds to the "29" in the part number per Table 1 of the datasheet, and is implemented via an internal precision voltage divider - no external components required for threshold setting.
Does MAX6309UK29D3-T support manual reset, and how is it implemented?
Yes, MAX6309UK29D3-T includes a dedicated MR (manual reset) input on pin 4. It is internally pulled up to VCC with 63.5kΩ, accepts TTL/CMOS logic levels, and asserts RESET when pulled low. A momentary switch from MR to GND suffices - no external pull-up or debounce circuitry is needed, and the minimum pulse width is guaranteed at 1.5µs.
What is the function of the RST IN pin on MAX6309UK29D3-T?
The RST IN pin (pin 3) on MAX6309UK29D3-T is an adjustable undervoltage comparator input referenced to an internal 1.23V threshold. When used with an external resistor divider, it monitors a second supply rail (e.g., 5V analog section) and triggers RESET if that rail falls below the programmed level - enabling true dual-supply supervision alongside the primary 2.93V VCC monitor.
How does the RESET output type of MAX6309UK29D3-T differ from MAX6305 series parts?
Unlike the open-drain RESET output of MAX6305/MAX6306, the MAX6309UK29D3-T features an active-low push/pull RESET (pin 1). It actively drives high (VOH ≥ 0.8×VCC) and low (VOL ≤ 0.3V), eliminating dependency on external pull-up resistors and ensuring robust drive into heavy capacitive loads or µP reset pins lacking internal bias.
Is MAX6309UK29D3-T compatible with 1.8V microcontrollers?
No - MAX6309UK29D3-T requires VCC ≥ 1.0V to guarantee RESET validity, but its internal VCC monitor is factory-set to 2.93V and its operational specifications (e.g., VOH, VOL, MR thresholds) assume VCC ≥ 2.5V per Electrical Characteristics. It is not rated for reliable operation with 1.8V core supplies; use MAX6312 or MAX6313 variants for lower-voltage supervision.
MAX6309UK29D3-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 2.93V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6309UK29D3-T FAQ
1.How can I place an order for MAX6309UK29D3-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6309UK29D3-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 MAX6309UK29D3-T reliable?
The price and inventory of MAX6309UK29D3-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6309UK29D3-T is usually 5 days.
3.What payment methods are accepted for MAX6309UK29D3-T?
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4.How is shipping managed for MAX6309UK29D3-T?
MAX6309UK29D3-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6309UK29D3-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 MAX6309UK29D3-T?
For technical support, including MAX6309UK29D3-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6309UK29D3-T requirements.
6.How does Aetrix verify that MAX6309UK29D3-T is sourced from the original manufacturer or authorized distributors?
All MAX6309UK29D3-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 MAX6309UK29D3-T meets industry standards.
7.What is the process for return or replacement of MAX6309UK29D3-T?
All MAX6309UK29D3-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6309UK29D3-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 MAX6309UK29D3-T part is unused and in its original packaging.
Return procedure for MAX6309UK29D3-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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