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Analog Devices Inc./Maxim Integrated MAX6306UK29D3-T
- Part No.:
- MAX6306UK29D3-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6306UK29D3-T.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,753
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Product details
Overview
The MAX6306UK29D3-T from Maxim Integrated is a 5-pin SOT23 programmable reset IC designed to monitor VCC and an external undervoltage input (RST IN), asserting an active-low push/pull RESET output when either falls below its threshold. It features a factory-set 2.93V ±2.5% VCC reset threshold, 140ms minimum reset timeout, 8µA supply current, and guaranteed RESET validity down to VCC = 1V. It is used in multivoltage embedded systems requiring reliable power-on and brownout reset supervision.
For engineers reviewing the MAX6306UK29D3-T datasheet, MAX6306UK29D3-T pinout, MAX6306UK29D3-T application, or MAX6306UK29D3-T equivalent, key selection considerations include its dual-supply monitoring capability (VCC + RST IN), manual reset input (MR), immunity to fast transients, and compatibility with 3.3V/5V systems requiring precise, low-power reset assertion.
Technical Context
The MAX6306UK29D3-T implements a precision internal voltage divider to monitor VCC against a factory-trimmed 2.93V threshold, while simultaneously comparing an external voltage at RST IN to a 1.23V internal reference via an adjustable resistor divider. Its reset generator includes a temperature-stable timeout timer and glitch-immune comparators.
This device uses a push/pull output stage capable of sourcing and sinking current, eliminating the need for an external pull-up resistor. The MR input includes a 63.5kΩ internal pull-up and supports TTL/CMOS logic levels, enabling direct switch interfacing without debounce circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 2.93V ±2.5% at -40°C to +85°C - sets precise brownout detection point for main supply |
| RST IN Threshold | 1.23V ±0.06V - internal reference for external undervoltage monitoring via resistor divider |
| Reset Timeout Period | 140ms (min) - ensures µP remains held in reset long enough for stable power rail settling |
| Supply Current | 8µA (typ) at +25°C - enables use in battery-powered portable equipment with minimal quiescent drain |
| RESET Output Type | Active-low push/pull - drives high/low actively; no external pull-up required for standard µP reset inputs |
| MR Input Pull-up | 63.5kΩ (typ) - allows direct connection of momentary switch to GND without external components |
| Operating Temperature | 0°C to +70°C - suitable for commercial-grade industrial and computing applications |
Pinout & Package
Package: 5-pin SOT23 (U5+1), surface-mount, RoHS-compliant lead-free option available as MAX6306UK29D3+T.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET | Active-low push/pull reset output | Asserts low during reset condition; actively drives high after timeout - compatible with most µP reset inputs without pull-up |
| 2 - GND | System ground reference | Return path for all internal comparators and output stage; must be low-impedance connection to system ground plane |
| 3 - RST IN | Adjustable undervoltage reset input | Monitors external supply via resistor divider; asserts reset if voltage falls below 1.23V reference |
| 4 - MR | Manual reset input | Pulled high internally; driving low forces reset for ≥140ms after release - enables operator-initiated system restart |
| 5 - VCC | Main supply input and monitored rail | Power source and primary supervision target; internal trimmed divider sets 2.93V reset threshold |
Key Features
| Feature | Design Value |
|---|---|
| Dual-rail monitoring | Simultaneously supervises VCC (2.93V threshold) and external supply via RST IN - supports 3.3V/5V or mixed-voltage system integrity |
| Transient immunity | Guaranteed immunity to fast negative-going VCC transients ≤100ns at 2.93V overdrive - prevents false resets in noisy environments |
| No external components | Factory-programmed threshold and timeout eliminate need for external resistors, capacitors, or trim pots - reduces BOM count and layout area |
| Valid RESET to 1V | RESET output remains logic-valid (VOL ≤0.3V, VOH ≥0.8×VCC) down to VCC = 1V - ensures deterministic behavior during deep brownout |
| Manual reset integration | MR pin with internal 63.5kΩ pull-up and 1.5µs minimum pulse width - enables simple switch interface with no external biasing or filtering |
Applications
| Industrial PLC I/O Module | Medical Patient Monitor |
|---|---|
Use Scenario: Monitors both 5V logic rail and isolated 3.3V sensor interface supply in a DIN-rail mounted controller. IC Role / Device Role / Timing Role: Dual-supply supervisor asserting synchronized reset across FPGA, microcontroller, and analog front-end ASICs. Use Value: Prevents partial initialization and metastability by holding all domains in reset until both rails stabilize above 2.93V and 3.3V-derived RST IN threshold. |
Use Scenario: Ensures safe boot sequence in a battery-backed portable vital signs monitor with separate 3.3V MCU and 5V display backlight supplies. IC Role / Device Role / Timing Role: Primary reset generator coordinating power-up sequencing and brownout recovery across safety-critical subsystems. Use Value: 140ms timeout guarantees full ADC calibration and EEPROM checksum validation before application code execution begins. |
| Network Edge Router | Automotive Infotainment Head Unit |
Use Scenario: Supervises 12V-to-5V DC/DC converter output and 3.3V PoE interface supply in a fanless enterprise switch. IC Role / Device Role / Timing Role: Fault-tolerant reset supervisor with MR input for remote firmware recovery via GPIO-controlled reset pulse. Use Value: MR-triggered reset persists for full 140ms timeout even after brief switch bounce, ensuring clean reboot without watchdog intervention. |
Use Scenario: Monitors 5V infotainment SoC supply and 3.3V CAN transceiver rail in a vehicle head unit exposed to load-dump transients. IC Role / Device Role / Timing Role: Immune reset supervisor preventing spurious reboots during engine cranking or alternator ripple events. Use Value: Internal transient rejection eliminates need for additional RC filtering on VCC, reducing board space and cost in constrained automotive layouts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar reset supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6306UK29D2-T | Same 2.93V VCC threshold but 20ms min reset timeout (vs. 140ms) | Suitable for faster-boot systems where shorter reset hold time is acceptable | Select when µP initialization completes in <20ms and tighter timing control is needed |
| TLV803EB29DBZR | 2.93V threshold, open-drain output, 35µA ICC, no MR or RST IN inputs | Single-rail monitoring only; requires external pull-up; lacks manual reset and auxiliary input | Choose for cost-sensitive, space-constrained designs needing basic VCC supervision only |
Compared with MAX6306UK29D2-T and TLV803EB29DBZR, the MAX6306UK29D3-T uniquely combines dual-supply monitoring, manual reset, and a 140ms timeout in a single SOT23 package - making it optimal for systems requiring robust, field-serviceable reset coordination across multiple voltage domains.
Availability
MAX6306UK29D3-T is available at Aetrix Electronics and suitable for industrial PLCs, medical patient monitors, network edge routers, automotive infotainment head units, and portable test equipment requiring stable component supply across extended product lifecycles.
Supply support for MAX6306UK29D3-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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, computing, and communications applications.
The MAX6305–MAX6313 family was designed specifically for multivoltage microprocessor supervision in space-constrained, low-power systems - delivering precision reset thresholds, transient immunity, and integrated manual reset in ultra-small packages.
FAQ
What is the exact factory-set VCC reset threshold for MAX6306UK29D3-T?
The MAX6306UK29D3-T has a factory-trimmed VCC reset threshold of 2.93V, with tolerance of ±2.5% over the operating temperature range of 0°C to +70°C. This value is confirmed in Table 1 of the datasheet and corresponds to the "29" suffix in the part number. The threshold is set via an internal precision voltage divider and does not require external calibration.
Does MAX6306UK29D3-T support monitoring of a second independent supply?
Yes, the MAX6306UK29D3-T supports dual-supply monitoring: it supervises VCC (at 2.93V) and provides an adjustable RST IN input referenced to a 1.23V internal comparator. By connecting an external resistor divider to RST IN, users can configure supervision of a second supply such as 3.3V or 1.8V - enabling coordinated reset across multiple rails in multivoltage systems.
What is the function and electrical behavior of the MR pin on MAX6306UK29D3-T?
The MR (Manual Reset) pin on MAX6306UK29D3-T is an active-low input with a 63.5kΩ internal pull-up resistor. Driving MR low forces the RESET output active for the full 140ms timeout period, even after MR returns high. It accepts TTL/CMOS logic levels and requires no external components - a simple momentary switch to GND suffices for field service reset functionality.
Is MAX6306UK29D3-T compatible with systems powered below 3V?
The MAX6306UK29D3-T operates with VCC from 2.5V to 5.5V and guarantees valid RESET output down to VCC = 1V. However, its 2.93V reset threshold means it is intended for systems where the monitored VCC rail is ≥3V. For sub-3V applications, alternative parts with lower thresholds (e.g., MAX6306UK25D3-T) should be selected - the "29" in MAX6306UK29D3-T explicitly denotes 2.93V nominal threshold.
How does the reset timeout period of MAX6306UK29D3-T compare to other variants in the family?
The "D3" suffix in MAX6306UK29D3-T specifies a minimum reset timeout period of 140ms. This is distinct from D1 (1ms), D2 (20ms), and D4 (1120ms) variants. The 140ms duration is optimized for systems requiring sufficient time for power rail stabilization, oscillator startup, and memory initialization - longer than D1/D2 but more responsive than D4 for mid-speed microcontrollers.
MAX6306UK29D3-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, Adj
- Output:
- Open Drain or Open Collector
- 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
MAX6306UK29D3-T FAQ
1.How can I place an order for MAX6306UK29D3-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6306UK29D3-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 MAX6306UK29D3-T reliable?
The price and inventory of MAX6306UK29D3-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6306UK29D3-T is usually 5 days.
3.What payment methods are accepted for MAX6306UK29D3-T?
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4.How is shipping managed for MAX6306UK29D3-T?
MAX6306UK29D3-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6306UK29D3-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 MAX6306UK29D3-T?
For technical support, including MAX6306UK29D3-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6306UK29D3-T requirements.
6.How does Aetrix verify that MAX6306UK29D3-T is sourced from the original manufacturer or authorized distributors?
All MAX6306UK29D3-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 MAX6306UK29D3-T meets industry standards.
7.What is the process for return or replacement of MAX6306UK29D3-T?
All MAX6306UK29D3-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6306UK29D3-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 MAX6306UK29D3-T part is unused and in its original packaging.
Return procedure for MAX6306UK29D3-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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