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Analog Devices Inc./Maxim Integrated MAX6309UK27D2
- Part No.:
- MAX6309UK27D2
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6309UK27D2.pdf
- Description:
- IC SUPERVISOR PROGRAMMABLE RESET
- Quantity:
- Payment:
- Shipping:
Inventory:1,798
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Product details
Overview
The MAX6309UK27D2 from Maxim Integrated is a 5-pin SOT23 programmable supervisory IC that monitors VCC (factory-set at 2.7V ±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 8µA supply current, and provides a 20ms minimum reset timeout period. It is used in multivoltage embedded systems requiring reliable power-on and brownout reset control.
For engineers reviewing the MAX6309UK27D2 datasheet, MAX6309UK27D2 pinout, MAX6309UK27D2 application, or MAX6309UK27D2 equivalent, key selection criteria include its 2.7V factory-trimmed VCC threshold, 20ms timeout (D2), push/pull RESET drive capability, MR input with internal 63.5kΩ pull-up, and immunity to fast VCC transients - all critical for portable and industrial microprocessor reset integrity.
Technical Context
The MAX6309UK27D2 implements a precision bandgap reference (1.23V) to compare VCC against its factory-trimmed 2.7V threshold via an internal resistor divider, while separately monitoring RST IN against the same reference using external resistive dividers. Its reset generator includes a temperature-stable RC timer for the 20ms (D2) timeout, and its push/pull RESET output sources up to 800µA and sinks up to 3.2mA at VCC ≥ 4.25V.
It integrates transient-immune comparators on all inputs: VCC detection ignores negative-going glitches ≤40µs at 2.7V overdrive; RST IN and MR inputs reject sub-1µs noise pulses. The MR pin features TTL/CMOS-compatible logic thresholds (VIH = 0.7×VCC when VTH < 4.0V) and internal ESD protection, with design guidance specifying co-location of MR and VCC supplies to avoid absolute maximum rating violations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 2.7V ±2.5% (factory-trimmed; enables precise 3.3V system supervision) |
| Reset Timeout Period | 20ms minimum (D2 variant; ensures sufficient µP initialization time after power stabilization) |
| Supply Current | 8µA typical at +25°C (enables multi-year battery life in portable equipment) |
| RESET Output Type | Active-low push/pull (drives µP reset pins directly without external pull-up) |
| MR Input Pull-up | 63.5kΩ internal (allows momentary switch-to-GND manual reset without external components) |
| Valid RESET Down to | VCC = 1V (guarantees reset assertion during deep brownout before µP functional collapse) |
| RST IN Threshold | 1.23V ±0.03V (supports external resistor-divider programming for secondary supply monitoring) |
Pinout & Package
MAX6309UK27D2 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 1 is RESET, Pin 2 is GND, Pin 3 is RST IN, Pin 4 is MR, and Pin 5 is VCC - matching the standard SOT23-5 top-view orientation with Pin 1 marked by a dot or bevel.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET | Active-low push/pull reset output | Drives microprocessor reset pin directly; sinks 3.2mA / sources 800µA at VCC ≥ 4.25V |
| 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 divided voltage to 1.23V reference; asserts reset if input falls below threshold |
| 4 - MR | Manual-reset input | Logic-low pulse forces reset; internal 63.5kΩ pull-up allows switch-to-GND interface |
| 5 - VCC | Main supply and monitored rail | Powered from system 3.3V rail; internally divided to set 2.7V reset threshold |
Key Features
| Feature | Design Value |
|---|---|
| Precision factory-set VCC threshold | 2.7V ±2.5% over -40°C to +85°C - eliminates calibration overhead in 3.3V systems |
| Push/pull RESET output | No external pull-up required - simplifies BOM and improves noise immunity vs. open-drain alternatives |
| Immunity to VCC transients | Rejects negative glitches ≤40µs at 2.7V overdrive - prevents spurious resets in noisy power environments |
| Guaranteed operation to VCC = 1V | Ensures reset remains asserted through deep brownout - critical for deterministic µP shutdown |
| No external timing components | Factory-programmed 20ms timeout (D2) - removes capacitor tolerance and aging concerns |
Applications
| Industrial PLC I/O Modules | Portable Medical Monitors |
|---|---|
Use Scenario: Power sequencing and fault recovery in DIN-rail mounted controllers with dual 24V/5V rails. IC Role / Device Role / Timing Role: Supervises 5V logic rail (VCC) and 24V analog supply (via RST IN divider); asserts RESET until both stabilize and hold for 20ms. Use Value: Prevents firmware corruption during AC line sags by guaranteeing µP reset remains active until all supplies meet regulation. |
Use Scenario: Battery-powered ECG and SpO₂ devices requiring ultra-low quiescent current and robust reset under partial discharge. IC Role / Device Role / Timing Role: Monitors main Li-ion cell (via RST IN divider) and 3.3V LDO output (VCC = 2.7V threshold); uses MR for clinician-initiated recalibration. Use Value: 8µA supply current extends battery life; 20ms timeout ensures ADC and display initialization completes before runtime. |
| Automotive Body Control Units | Network Edge Routers |
Use Scenario: Cold-cranking resilience in 12V automotive subsystems where battery voltage dips to 6V during engine start. IC Role / Device Role / Timing Role: VCC tied to 5V post-regulator; RST IN monitors raw 12V; MR linked to ignition signal for controlled boot on key turn. Use Value: Immunity to 10µs transients prevents false resets during cranking; guaranteed reset to VCC = 1V covers worst-case sag. |
Use Scenario: High-availability data center routers with redundant 12V/3.3V/1.2V rails and hot-swap capability. IC Role / Device Role / Timing Role: Primary VCC supervision at 3.3V (2.7V threshold); RST IN tracks 12V bias rail; MR enables remote firmware recovery via GPIO. Use Value: Push/pull RESET drives FPGA configuration reset without external circuitry; 20ms timeout aligns with PCIe link training requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar supervisory IC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6309UK27D3 | 140ms minimum reset timeout (vs. 20ms); identical VCC threshold, package, and pinout | Suitable for systems requiring longer initialization windows (e.g., complex FPGA configuration) | Select when extended reset hold time is needed; no PCB changes required |
| TPS3808G125DBVR | 2.5V fixed VCC threshold, 200ms timeout, 1.6µA supply current, SOT23-6 package | Lacks RST IN and MR inputs; optimized for ultra-low-power single-rail supervision only | Choose for minimal current draw in simple 2.5V systems; requires layout adaptation due to 6-pin footprint |
Compared with MAX6309UK27D2, the D3 variant offers longer reset assertion for complex boot sequences, while the TPS3808G125DBVR trades multi-input flexibility for lower quiescent current and simpler architecture - making MAX6309UK27D2 optimal for cost-sensitive, feature-rich 3.3V embedded designs needing manual reset and auxiliary supply monitoring.
Availability
MAX6309UK27D2 is available at Aetrix Electronics and suitable for industrial control systems, portable medical electronics, automotive body modules, and network infrastructure requiring stable component supply across extended temperature ranges (-40°C to +85°C).
Supply support for MAX6309UK27D2 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 markets.
The MAX6305–MAX6313 family was designed to provide compact, low-power, multi-rail supervisory solutions for space- and energy-constrained microprocessor systems - with the MAX6309UK27D2 targeting 3.3V-based embedded platforms requiring factory-programmed accuracy and manual reset capability.
FAQ
What is the factory-programmed VCC reset threshold for MAX6309UK27D2?
The MAX6309UK27D2 has a factory-programmed VCC reset threshold of 2.7V with a tolerance of ±2.5% over the full operating temperature range (-40°C to +85°C). This value is set by an internal trimmed resistor divider and is confirmed in the device's ordering code "UK27", where "27" denotes the 2.7V nominal threshold per Maxim's Table 1. The MAX6309UK27D2 does not require external components to configure this threshold.
What does the "D2" suffix indicate in MAX6309UK27D2?
The "D2" suffix in MAX6309UK27D2 specifies a factory-programmed minimum reset timeout period of 20ms. This timeout begins when all monitored supplies (VCC and RST IN) exceed their respective thresholds and ensures the RESET signal remains asserted long enough for microprocessor initialization. The D2 option is one of four standard timeout variants (D1=1ms, D2=20ms, D3=140ms, D4=1120ms) defined in the MAX6309UK27D2 datasheet.
Does MAX6309UK27D2 support manual reset functionality?
Yes, MAX6309UK27D2 includes a dedicated MR (manual reset) input on Pin 4. A logic-low pulse on MR forces the RESET output active for the duration of the pulse plus the full 20ms timeout period after MR returns high. The MR pin features an internal 63.5kΩ pull-up resistor, allowing direct connection of a momentary switch to ground without external components. Its logic thresholds scale with VCC (VIH = 0.7×VCC when VTH < 4.0V), ensuring compatibility across 3.3V and 5V systems.
What is the RESET output structure of MAX6309UK27D2?
The MAX6309UK27D2 features an active-low push/pull RESET output on Pin 1. Unlike open-drain variants, this output can both sink current (up to 3.2mA at VCC ≥ 4.25V) and source current (up to 800µA at VCC ≥ 4.25V), enabling direct drive of microprocessor reset inputs without an external pull-up resistor. This architecture improves noise immunity and reduces component count compared to open-drain supervisory ICs.
Can MAX6309UK27D2 monitor a second voltage rail besides VCC?
Yes, MAX6309UK27D2 includes an RST IN input on Pin 3 specifically for monitoring a second voltage rail. This input compares the applied voltage against an internal 1.23V reference; a resistor divider is used to scale the target rail (e.g., 12V, 24V, or battery voltage) so that RST IN falls below 1.23V when the rail drops below the desired undervoltage threshold. This allows independent supervision of auxiliary supplies while VCC monitors the primary 3.3V logic rail.
MAX6309UK27D2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 2.7V, Adj
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 20ms Minimum
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6309UK27D2 FAQ
1.How can I place an order for MAX6309UK27D2 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6309UK27D2 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 MAX6309UK27D2 reliable?
The price and inventory of MAX6309UK27D2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6309UK27D2 is usually 5 days.
3.What payment methods are accepted for MAX6309UK27D2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6309UK27D2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6309UK27D2?
MAX6309UK27D2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6309UK27D2 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 MAX6309UK27D2?
For technical support, including MAX6309UK27D2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6309UK27D2 requirements.
6.How does Aetrix verify that MAX6309UK27D2 is sourced from the original manufacturer or authorized distributors?
All MAX6309UK27D2 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 MAX6309UK27D2 meets industry standards.
7.What is the process for return or replacement of MAX6309UK27D2?
All MAX6309UK27D2 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6309UK27D2, 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 MAX6309UK27D2 part is unused and in its original packaging.
Return procedure for MAX6309UK27D2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX6309UK27D2 Tags
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