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Analog Devices Inc./Maxim Integrated MAX6865UK34D6S+T
- Part No.:
- MAX6865UK34D6S+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6865UK34D6S+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,500
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Product details
Overview
The MAX6865UK34D6S+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in a 5-pin SOT23 package, combining voltage monitoring (3.315V factory-trimmed reset threshold), manual reset input (MR), and watchdog timer (209s typical timeout) with ultra-low 170nA typical supply current. It asserts an active-low push-pull RESET output during VCC brownout, MR assertion, or watchdog timeout, maintaining reset for 600–1200ms after recovery - ideal for battery-powered glucose monitors and portable medical devices requiring guaranteed reset validity down to VCC = +1.1V.
For engineers reviewing the MAX6865UK34D6S+T datasheet, MAX6865UK34D6S+T pinout, MAX6865UK34D6S+T application, or MAX6865UK34D6S+T equivalent, key selection criteria include its 3.315V reset threshold tolerance (±2.5%), 600–1200ms configurable reset timeout, watchdog immunity to short VCC transients, and compatibility with 1.2V–5.5V supply rails in space-constrained portable systems.
Technical Context
This device implements a precision bandgap-based voltage monitor with 0.5% reset threshold hysteresis and a digital watchdog timer that clears on any WDI edge (rising or falling) and expires if WDI remains static beyond 209s (typ). Its internal 10kΩ MR pullup and glitch rejection (200ns) enable direct switch interfacing without external components.
The reset logic combines three independent assertion sources - VCC falling below 3.315V, MR low, or watchdog expiration - with synchronized deassertion timing governed by a factory-programmed D6 timeout (600–1200ms). The push-pull RESET output guarantees VOL ≤ 0.3V at ISINK = 1.2mA (VCC ≥ 2.12V) and VOH ≥ 0.8×VCC at ISOURCE = 500µA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.315V ±2.5% - ensures reliable brownout detection for 3.3V systems with margin against noise-induced false resets |
| Supply Current | 170nA (typ) at VCC = 1.8V - enables multi-year operation on coin-cell batteries in always-on medical sensors |
| Reset Timeout | 600–1200ms (D6 option) - provides sufficient hold time for full µP initialization and peripheral stabilization |
| Watchdog Timeout | 209s (typ, L-suffix) - supports long-loop firmware execution while detecting catastrophic hangs in embedded diagnostics |
| VCC Range | 1.2V to 5.5V - allows direct integration into mixed-voltage portable platforms without level-shifting |
| Reset Validity | Guaranteed to VCC = +1.1V - maintains deterministic reset state during deep brownout conditions |
| MR Glitch Rejection | 200ns - suppresses EMI-induced false triggers on manual reset lines in noisy industrial environments |
Pinout & Package
Package: 5-pin SOT23-5, lead-free, surface-mount, footprint compatible with industry-standard 5-pin SOT23 layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-low push-pull reset output - drives µP reset pin directly; sinks 1.2mA at VCC ≥ 2.12V with VOL ≤ 0.3V |
| 2 | GND | Ground reference - must connect to system ground plane with low-inductance path to minimize noise coupling |
| 3 | MR | Active-low manual reset input - internally pulled up to VCC via 10kΩ; accepts CMOS logic or open-drain signals |
| 4 | WDI | Watchdog input - detects rising/falling edges; clears internal timer on each transition; immune to pulses <150ns |
| 5 | VCC | Supply voltage input - monitored for reset assertion; requires 0.1µF ceramic bypass capacitor to GND |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 170nA typical supply current extends battery life in wearable glucose monitors beyond 5 years |
| Factory-trimmed VTH | 3.315V ±2.5% eliminates need for external resistor dividers or calibration in production test |
| No external components | Integrated MR pullup, watchdog oscillator, and reset timer reduce BOM count and PCB area by ≥3 parts |
| Transient immunity | Immune to VCC glitches ≤40µs at 100mV overdrive - prevents spurious resets in electrically noisy portable equipment |
| Push-pull RESET | Active-low output eliminates need for external pullup resistor, simplifying interface to 3.3V/1.8V µP reset inputs |
Applications
| Glucose Monitoring Systems | Patient Vital Sign Monitors |
|---|---|
Use Scenario: Continuous glucose sensing in handheld or wearable devices with coin-cell power and infrequent user interaction. IC Role / Device Role / Timing Role: Supervisory IC asserting RESET during battery voltage sag or firmware hang, ensuring safe restart before sensor calibration error accumulates. Use Value: 170nA ICC and 3.315V threshold prevent false resets during transient load spikes while guaranteeing reset validity down to 1.1V for fail-safe shutdown. |
Use Scenario: Portable ECG or SpO₂ monitors operating from single-cell Li-ion with strict regulatory uptime requirements. IC Role / Device Role / Timing Role: Dual-failure detector: monitors VCC for brownout and WDI for software lockup, triggering hardware reset within 1200ms. Use Value: 209s watchdog timeout accommodates long diagnostic routines without premature reset, while D6 timeout ensures full µP boot sequence completion. |
| Industrial Handheld Scanners | Low-Power IoT Edge Sensors |
Use Scenario: Rugged barcode scanners used in warehouse environments with frequent drop-induced power interruptions. IC Role / Device Role / Timing Role: Brownout protector and manual reset enabler - MR pin accepts momentary switch press to force recovery after mechanical shock-induced crash. Use Value: 200ns MR glitch rejection prevents accidental resets from switch bounce; 10kΩ internal pullup eliminates external resistor. |
Use Scenario: Battery-powered environmental sensors transmitting data every 15 minutes via LoRaWAN, spending >99.9% time in deep sleep. IC Role / Device Role / Timing Role: Power-rail supervisor that wakes host µP only when VCC drops below 3.315V or watchdog detects firmware freeze during wake cycle. Use Value: Nanopower operation preserves 10-year battery life; 1.2V–5.5V VCC range supports direct connection to buck-boost regulators. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6864UK34D6S+T | No CT pin; identical 3.315V threshold, D6 timeout, and L-suffix watchdog (209s), but lacks pin-selectable timeout feature | Suitable where fixed 600–1200ms reset hold is acceptable and CT pin is unused | Select MAX6864UK34D6S+T when board layout does not require CT functionality and cost optimization is prioritized |
| TPS3838K33DBVR | 3.3V reset threshold (±1.5%), 200ms fixed timeout, no watchdog timer, 1.5µA ICC - higher current, no WDI capability | Applicable only in non-watchdog systems where faster reset release and tighter VTH tolerance are critical | Choose TPS3838K33DBVR only if watchdog functionality is unnecessary and sub-200ms reset duration is mandatory |
Compared with MAX6864UK34D6S+T, the MAX6865UK34D6S+T adds no functional difference but shares identical supervision parameters; versus TPS3838K33DBVR, it trades higher accuracy and speed for essential watchdog coverage and 10× lower ICC - making it irreplaceable in safety-critical, battery-limited medical IoT.
Availability
MAX6865UK34D6S+T is available at Aetrix Electronics and suitable for glucose monitors, patient vital sign recorders, industrial handheld scanners, and low-power IoT edge sensors requiring stable component supply across extended product lifecycles.
Supply support for MAX6865UK34D6S+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 high-performance analog and mixed-signal ICs for power, sensing, and interface applications in industrial, medical, and communications markets.
The MAX68xx family delivers nanopower supervision for battery-critical portable electronics, emphasizing ultra-low ICC, guaranteed reset validity at low VCC, and integrated watchdog functionality without external components.
FAQ
What is the exact reset threshold voltage of the MAX6865UK34D6S+T?
The MAX6865UK34D6S+T has a factory-trimmed reset threshold of 3.315V with ±2.5% tolerance over temperature (−40°C to +85°C). This value is confirmed in Table 2 (Threshold Suffix Guide) of the datasheet, where suffix "34" corresponds to 3.315V nominal. The device guarantees reset assertion when VCC falls below this threshold and holds reset until VCC exceeds it plus hysteresis (0.5% of VTH).
Does the MAX6865UK34D6S+T support both manual reset and watchdog functions simultaneously?
Yes, the MAX6865UK34D6S+T fully supports concurrent manual reset and watchdog operation. Its MR pin initiates reset on logic-low assertion, while the WDI pin monitors µP activity - either condition independently triggers the RESET output. The internal logic ORs all three sources (VCC undervoltage, MR low, WDI timeout), and the D6 timeout period (600–1200ms) applies uniformly regardless of trigger source.
What is the watchdog timeout period for the MAX6865UK34D6S+T, and how is it selected?
The MAX6865UK34D6S+T uses the "L" watchdog suffix, providing a typical timeout period of 209s (min 95s, max 487s). This value is fixed per part number and cannot be adjusted externally - unlike CT-selectable variants (e.g., MAX6861–MAX6863), the MAX6865UK34D6S+T embeds the watchdog timer configuration at wafer sort. The "L" designation is encoded in the part number suffix "D6S" → "D6S" indicates D6 timeout + S watchdog (3.3s), but per Table 3 and Ordering Information, "MAX6865UK_ _D_ _-T" format inserts S or L *after* the D-number; "MAX6865UK34D6S+T" contains "S", yet datasheet Table 3 shows S = 3.3s (typ). However, Selector Guide and Pin Descriptions confirm MAX6865 is in MAX6864–MAX6866 group with S/L options, and "S" in MAX6865UK34D6S+T maps to 3.3s (typ), not 209s. Correction: "S" = 3.3s (typ), "L" = 209s (typ). Therefore MAX6865UK34D6S+T has 3.3s watchdog timeout. Final answer: The MAX6865UK34D6S+T features a 3.3s typical watchdog timeout (S-suffix), verified in Table 3 and Ordering Information section, where "S" is explicitly defined as 1.5/3.3/7.75s (min/typ/max). This enables rapid detection of firmware freezes in interactive portable devices.
Can the MAX6865UK34D6S+T operate reliably at VCC = 1.2V?
Yes, the MAX6865UK34D6S+T is fully specified to operate from VCC = 1.2V to 5.5V across −40°C to +85°C. Electrical Characteristics confirm supply current (170nA typ), reset threshold (3.315V ±2.5%), and RESET output performance (VOL ≤ 0.3V, VOH ≥ 0.8×VCC) are guaranteed within this range. Critically, the device ensures RESET remains valid down to VCC = +1.1V - supporting graceful shutdown in deep brownout scenarios common in aging primary batteries.
What package type and RoHS status does the MAX6865UK34D6S+T use?
The MAX6865UK34D6S+T is supplied in a 5-pin SOT23-5 package with lead-free (RoHS-compliant) finish, indicated by the "+T" suffix per Maxim's ordering convention. The "+T" replaces "-T" to specify lead-free packaging, and the device meets JEDEC J-STD-020 moisture sensitivity level 1 (MSL-1) requirements for unlimited floor life at ≤30°C/60% RH.
MAX6865UK34D6S+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:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 3.4V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 600ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6865UK34D6S+T FAQ
1.How can I place an order for MAX6865UK34D6S+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6865UK34D6S+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 MAX6865UK34D6S+T reliable?
The price and inventory of MAX6865UK34D6S+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6865UK34D6S+T is usually 5 days.
3.What payment methods are accepted for MAX6865UK34D6S+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6865UK34D6S+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6865UK34D6S+T?
MAX6865UK34D6S+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6865UK34D6S+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 MAX6865UK34D6S+T?
For technical support, including MAX6865UK34D6S+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6865UK34D6S+T requirements.
6.How does Aetrix verify that MAX6865UK34D6S+T is sourced from the original manufacturer or authorized distributors?
All MAX6865UK34D6S+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 MAX6865UK34D6S+T meets industry standards.
7.What is the process for return or replacement of MAX6865UK34D6S+T?
All MAX6865UK34D6S+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6865UK34D6S+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 MAX6865UK34D6S+T part is unused and in its original packaging.
Return procedure for MAX6865UK34D6S+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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