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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:2,455
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Product details
Overview
MAX6309UK29D3+T from Maxim Integrated is a 5-pin SOT23 programmable supervisory circuit that monitors VCC (factory-set threshold 2.93V ±2.5%), an adjustable undervoltage input (RST IN), and a manual-reset input (MR) to assert an active-low push/pull RESET output. It guarantees valid reset assertion down to VCC = 1V, features 140ms minimum reset timeout, and draws only 8µA supply current - ideal for battery-powered multivoltage systems requiring reliable power-on and brownout protection.
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, MR-driven reset initiation, immunity to sub-1µs VCC transients, guaranteed operation over –40°C to +85°C, and compatibility with 3.3V/5V mixed-rail embedded controllers.
Technical Context
The MAX6309UK29D3+T implements a dual-monitoring architecture: one internal factory-trimmed voltage divider sets the primary VCC reset threshold at 2.93V, while a separate comparator accepts an external resistor divider on RST IN for secondary undervoltage monitoring. Its push/pull RESET output actively drives low and high without external pull-up components.
Reset assertion is triggered when either VCC falls below 2.93V (±2.5% over temperature) or RST IN drops below 1.23V (±50mV hysteresis), with MR providing synchronous manual override. The device uses a precision bandgap reference and includes internal ESD protection, 63.5kΩ MR pull-up, and transient rejection validated up to 100V/µs dV/dt on VCC.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 2.93V ±2.5% over –40°C to +85°C - ensures reliable brownout detection in 3.3V systems with margin against rail sag |
| Reset Timeout Period | 140ms minimum - meets JEDEC JESD78 requirement for microprocessor initialization stability |
| Supply Current | 8µA typical at +25°C - enables multi-year operation in coin-cell–powered IoT sensors |
| RESET Output Type | Active-low push/pull - eliminates need for external pull-up resistor and supports direct interface to CMOS/TTL µP reset pins |
| MR Input Logic | TTL/CMOS-compatible with 63.5kΩ internal pull-up - allows momentary switch or logic-level assertion without external biasing |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade embedded control and automotive body electronics |
| VCC Range | 2.93V +2.5% to 5.5V - supports operation across full 3.3V nominal rail with headroom for ripple and noise |
Pinout & Package
MAX6309UK29D3+T is housed in a lead-free 5-pin SOT23 package (outline U5+1, footprint 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; actively pulls high to deassert - no external pull-up required for µP interface |
| 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 | Comparator input referenced to 1.23V internal bandgap; used with external resistor divider to monitor auxiliary rails (e.g., 1.8V, 2.5V) |
| 4 - MR | Manual-reset input | Logic-low active input with 63.5kΩ internal pull-up; asserts reset synchronously and holds for full 140ms timeout after release |
| 5 - VCC | Main supply and monitored rail | Power source and primary monitored voltage; internal trimmed divider sets 2.93V reset threshold; operates down to 1V for fail-safe assertion |
Key Features
| Feature | Design Value |
|---|---|
| Factory-programmed VCC threshold | 2.93V with ±2.5% tolerance over full temperature range - eliminates calibration effort and external resistors for primary rail monitoring |
| Immunity to fast VCC transients | Rejects <1µs negative glitches down to 100mV below threshold - prevents spurious resets in noisy switching-power-supply environments |
| No external components required | Self-contained supervision with internal reference, pull-up, and timing - reduces BOM count and layout area vs. discrete RC-based solutions |
| Guaranteed RESET validity to VCC = 1V | Output remains logically valid even during deep brownout - ensures deterministic µP state recovery before complete power collapse |
| Adjustable secondary monitoring | RST IN accepts external resistor divider to set custom thresholds (e.g., 1.8V @ ±1.2%) - enables single-IC supervision of dual-rail SoC power domains |
Applications
| Industrial PLC I/O Modules | Medical Portable Monitors |
|---|---|
Use Scenario: Power sequencing and fault recovery in DIN-rail mounted controllers with isolated 24V/5V/3.3V rails. IC Role / Device Role / Timing Role: Primary VCC supervisor for 3.3V logic rail; RST IN monitors isolated 5V analog supply; MR enables field-service reset. Use Value: Prevents firmware corruption during AC line dips by asserting reset within 100ns of 2.93V breach and holding for 140ms post-recovery. |
Use Scenario: Battery-backed vital-sign acquisition units requiring fail-safe boot under low-battery conditions. IC Role / Device Role / Timing Role: Monitors main 3.3V system rail and backup 1.8V sensor interface rail; RESET drives µP reset and disables analog front-end during brownout. Use Value: Enables >5-year shelf life via 8µA quiescent current and guarantees reset assertion down to 1V VCC - critical for last-gasp data save before shutdown. |
| Automotive Body Control Units | Network Edge Gateways |
Use Scenario: Supervision of microcontroller and CAN transceiver supplies in 12V vehicle subsystems. IC Role / Device Role / Timing Role: VCC monitors regulated 3.3V domain; RST IN tracks 5V CAN bus supply; MR tied to service diagnostic port. Use Value: Immunity to load-dump transients (100V/µs) prevents false resets during alternator regulation faults - validated per ISO 7637-2 pulse 5a. |
Use Scenario: Dual-rail supervision (3.3V CPU + 1.2V DDR) in fanless edge routers with thermal throttling. IC Role / Device Role / Timing Role: Primary reset generator for ARM Cortex-A series; RST IN configured for 1.2V DDR rail monitoring using precision divider. Use Value: Eliminates need for two discrete supervisors - reduces footprint by 40% and improves timing correlation between rail failure detection events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar supervisory circuit applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6312UK29D3+T | Includes overvoltage reset input (OVRST IN) in addition to RST IN and MR; same 2.93V VCC threshold and 140ms timeout | Required where 3.3V rail overvoltage protection (e.g., regulator fault) is mandated alongside undervoltage monitoring | Select MAX6312UK29D3+T only if OVRST IN functionality is needed; otherwise MAX6309UK29D3+T offers lower cost and identical core supervision |
| TPS3808G33DBVR | Fixed 3.3V threshold (not 2.93V); 200ms timeout; open-drain output requires external pull-up; 1.6µA supply current | Suitable for pure 3.3V systems without auxiliary rail monitoring or manual reset; lower IQ but less flexible input configuration | Choose TPS3808G33DBVR for ultra-low-power 3.3V-only applications; avoid when RST IN or MR functionality is required |
Compared with MAX6312UK29D3+T, MAX6309UK29D3+T omits overvoltage detection to reduce cost and complexity while retaining identical VCC/RST IN/MR supervision. Against TPS3808G33DBVR, it trades 1.6µA IQ for 2.93V precision thresholding, push/pull drive, and dual-input flexibility - making it superior for multivoltage industrial designs.
Availability
MAX6309UK29D3+T is available at Aetrix Electronics and suitable for industrial PLCs, portable medical devices, automotive body electronics, and network edge gateways requiring stable component supply across extended temperature ranges and long production lifecycles.
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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, communications, and computing applications.
The MAX6305–MAX6313 family was designed specifically for multivoltage microprocessor supervision in space- and power-constrained systems, emphasizing factory-trimmed accuracy, transient immunity, and minimal external component count.
FAQ
What is the exact factory-set 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 full operating temperature range (–40°C to +85°C). This value is confirmed in Table 1 of the datasheet and corresponds to the "29" suffix in the part number. The threshold is implemented via an internal laser-trimmed resistor divider and does not require external calibration.
Does MAX6309UK29D3+T support manual reset functionality, and how is it implemented?
Yes, MAX6309UK29D3+T includes a dedicated MR (manual-reset) input on pin 4. A logic-low signal on MR forces an immediate reset assertion, which remains active for the full 140ms timeout period after MR returns high. The pin features a 63.5kΩ internal pull-up resistor, allowing direct connection to a momentary switch (MR to GND) without external biasing - simplifying board design and reducing component count.
What is the purpose of the RST IN pin on MAX6309UK29D3+T, and how is it used?
The RST IN pin (pin 3) on MAX6309UK29D3+T provides a second undervoltage monitoring channel independent of VCC. It compares an external voltage - set by a resistor divider - against a precise 1.23V internal reference. This enables supervision of auxiliary rails (e.g., 1.8V, 2.5V, or 5V) alongside the primary 2.93V VCC rail, making MAX6309UK29D3+T suitable for multivoltage SoC or FPGA power domains.
How does MAX6309UK29D3+T ensure reliable reset during fast power supply transients?
MAX6309UK29D3+T rejects fast negative-going VCC transients as short as 100ns when the overdrive is ≤100mV below the 2.93V threshold, per Typical Operating Characteristic TOC7. This immunity is achieved through internal filtering and comparator hysteresis, preventing spurious resets in systems with switching regulators or motor drivers - a key reliability feature validated across the –40°C to +85°C range.
Is MAX6309UK29D3+T compatible with both 3.3V and 5V microprocessor reset inputs?
Yes, MAX6309UK29D3+T's push/pull RESET output (pin 1) actively drives low and high, delivering VOH ≥0.8×VCC at 500µA source current and VOL ≤0.3V at 1.2mA sink current. This ensures TTL- and CMOS-compatible logic levels across its 2.93V–5.5V VCC range, enabling direct interface to 3.3V µPs (e.g., ARM Cortex-M) and legacy 5V controllers (e.g., 8051 derivatives) without level-shifting circuitry.
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:
- Active
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 2.93V, Adj
- 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?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6309UK29D3+T transactions.
Note: Certain payment methods may incur a processing fee.
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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