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Analog Devices Inc./Maxim Integrated MAX6865UK19D4S+T
- Part No.:
- MAX6865UK19D4S+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6865UK19D4S+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,524
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Product details
Overview
The MAX6865UK19D4S+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in a 5-pin SOT23 package, featuring ultra-low 170nA typical supply current, a factory-trimmed 1.9V reset threshold (suffix '19'), 1200ms minimum reset timeout (suffix 'D4'), and integrated watchdog timer with 3.3s typical timeout (suffix 'S'). It monitors VCC, responds to manual reset (MR), and asserts an active-low push-pull RESET output - ideal for battery-powered glucose monitors and portable medical devices requiring reliable brownout protection.
For engineers reviewing the MAX6865UK19D4S+T datasheet, MAX6865UK19D4S+T pinout, MAX6865UK19D4S+T application, or MAX6865UK19D4S+T equivalent, this page delivers verified electrical parameters, functional pin mapping, real-world use cases, and validated alternative options - all confirmed against Maxim's official datasheet (19-3139 Rev 4) and ordering documentation.
Technical Context
This device belongs to the MAX6864–MAX6869 family, integrating three core functions: precision voltage monitoring with hysteresis, a glitch-immune manual reset input (MR) with 10kΩ internal pullup and 250ns MR-to-reset delay, and a watchdog timer that triggers reset if WDI remains static beyond 3.3s (typ). The watchdog clears on any WDI edge, MR assertion, or RESET assertion.
It operates across VCC = 1.2V to 5.5V and guarantees valid RESET output down to VCC = 1.1V. Its 170nA supply current (typ at VCC = 1.8V) enables multi-year operation in coin-cell–powered systems, while immunity to ≤40µs VCC transients (at 100mV overdrive) ensures robustness in noisy environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current | 170nA typical at VCC = 1.8V - enables >10-year battery life in 10µA-average-power wearable devices. |
| Reset Threshold Voltage | 1.900V ±2.5% - factory-trimmed for precise brownout detection at Li-ion single-cell end-of-discharge. |
| Reset Timeout Period | 1200ms minimum - ensures full µP initialization and peripheral stabilization before release. |
| Watchdog Timeout | 3.3s typical - balances fault coverage and software execution margin for embedded firmware loops. |
| VCC Operating Range | 1.2V to 5.5V - supports direct interface with 1.8V/2.5V/3.3V/5V logic domains without level shifters. |
| RESET Output Type | Active-low push-pull - drives µP reset pin directly without external pullup; sinks 1.2mA at VCC ≥ 2.38V. |
| Guaranteed RESET Validity | Down to VCC = 1.1V - maintains deterministic reset state during deep brownout, preventing latch-up. |
Pinout & Package
Package: 5-pin SOT23-5, lead-free (RoHS-compliant), footprint compatible with industry-standard 0.95mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-low push-pull reset output; asserted low during VCC undervoltage, MR activation, or watchdog timeout. |
| 2 | GND | Ground reference for all internal circuits; must be connected to system ground plane with low-inductance path. |
| 3 | MR | Active-low manual reset input; internally pulled up to VCC via 10kΩ; accepts CMOS-level signals or momentary switch to GND. |
| 4 | WDI | Watchdog input; rising/falling edges clear internal timer; static high/low >3.3s (typ) triggers reset. |
| 5 | VCC | Primary supply and monitored voltage rail; requires 0.1µF ceramic bypass capacitor to GND for noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 170nA typical supply current enables decade-scale operation on CR2032 coin cells in always-on patient monitors. |
| Factory-trimmed VTH | 1.900V ±2.5% threshold eliminates external resistor networks and calibration overhead in production. |
| Integrated watchdog | 3.3s typical timeout with edge-triggered clear provides autonomous firmware crash recovery without µP intervention. |
| VCC transient immunity | Immune to ≤40µs VCC glitches at 100mV overdrive - prevents spurious resets in motor-driven or RF-noisy portable systems. |
| Valid RESET to 1.1V | Ensures deterministic reset assertion even during severe brownout, avoiding undefined µP states below 1.2V. |
Applications
| Glucose Monitoring Systems | Patient Vital Sign Loggers |
|---|---|
Use Scenario: Continuous glucose meters powered by single CR2032 cell, operating in variable temperature and EMI environments. IC Role / Device Role / Timing Role: Monitors battery voltage decay, asserts RESET before ADC/RF subsystem fails, and recovers from firmware hangs via WDI. Use Value: Prevents false glucose readings during brownout and ensures automatic reboot after sensor firmware lockup - critical for FDA Class II compliance. |
Use Scenario: Portable ECG/SpO₂ loggers recording data over 72-hour clinical sessions with intermittent wireless upload. IC Role / Device Role / Timing Role: Supervises main µP power rail and validates reset integrity during battery swap; watchdog guards against BLE stack deadlock. Use Value: Guarantees data integrity across power cycles and eliminates manual device reset - reducing clinician workflow interruption. |
| Wireless Medical Telemetry | Low-Power Wearable Sensors |
Use Scenario: Sub-GHz telemetry modules transmitting vitals to bedside hubs using intermittent burst transmission. IC Role / Device Role / Timing Role: Provides synchronized reset timing for µP and RF transceiver; MR enables field-service hard reset without opening enclosure. Use Value: Eliminates RF-induced reset corruption and enables remote diagnostics via hardware-initiated recovery - meeting IEC 62304 SW safety requirements. |
Use Scenario: Skin-adhesive biosensors sampling temperature/acceleration every 5 seconds on 3V lithium primary battery. IC Role / Device Role / Timing Role: Delivers 1200ms reset hold time for complete sensor initialization and 170nA quiescent draw to maximize runtime. Use Value: Extends usable battery life to >18 months while ensuring fail-safe behavior during battery depletion - key for disposable healthcare devices. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6864UK19D4S+T | No CT pin; identical VTH (1.9V), tRP (1200ms), tWD (3.3s), and pinout - differs only in RESET polarity (active-low push-pull same as MAX6865). | Same functional role but lacks active-high RESET option; suitable where only active-low reset is required. | Select MAX6864UK19D4S+T if active-high RESET is unnecessary and board layout rework is to be avoided. |
| TPS3836K33DBVR | Fixed 3.3V reset threshold, 200ms timeout, no watchdog; 5-pin SOT23, push-pull active-low RESET; 3.5µA ICC - 20× higher than MAX6865. | Applicable only in fixed 3.3V systems without watchdog needs; unsuitable for sub-2V brownout detection or ultra-low-power designs. | Choose TPS3836K33DBVR only for cost-sensitive, non-battery applications where 3.3V supervision suffices and µA-level ICC is acceptable. |
Compared with MAX6865UK19D4S+T, MAX6864UK19D4S+T offers identical supervision functionality at lower complexity, while TPS3836K33DBVR trades nanopower operation and watchdog capability for broader vendor availability and simpler qualification - making MAX6865 the optimal choice for regulated medical wearables demanding both ultra-low ICC and autonomous fault recovery.
Availability
MAX6865UK19D4S+T is available at Aetrix Electronics and suitable for glucose monitors, patient vital sign loggers, and wireless medical telemetry requiring stable component supply with guaranteed long-term manufacturability and RoHS-compliant packaging.
Supply support for MAX6865UK19D4S+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 applications in industrial, medical, and communications markets - emphasizing reliability, low power, and integration.
The MAX6864–MAX6869 family was engineered specifically for ultra-low-power, safety-critical portable medical electronics, combining nanopower consumption, factory-trimmed accuracy, and dual-fault protection (voltage + watchdog) in minimal footprint.
FAQ
What is the exact reset threshold voltage of the MAX6865UK19D4S+T?
The MAX6865UK19D4S+T has a factory-trimmed reset threshold voltage of 1.900V, with tolerance of ±2.5% over the full temperature range (-40°C to +85°C). This value is confirmed in Table 2 (Threshold Suffix Guide) of the Maxim datasheet 19-3139 Rev 4, where suffix '19' explicitly denotes 1.900V nominal VTH. The device guarantees valid reset assertion down to VCC = 1.1V, supporting reliable operation near battery exhaustion.
Does the MAX6865UK19D4S+T include a watchdog timer, and what is its timeout period?
Yes, the MAX6865UK19D4S+T includes an integrated watchdog timer with a typical timeout period of 3.3 seconds, as indicated by the 'S' suffix in the part number. Per Table 3 (Watchdog Timeout) of the datasheet, 'S' corresponds to min/typ/max values of 1.5s/3.3s/7.75s. The timer resets on any rising or falling edge at the WDI pin and triggers RESET if WDI remains static beyond this interval - providing autonomous firmware fault recovery.
What does the 'D4' suffix in MAX6865UK19D4S+T signify?
The 'D4' suffix in MAX6865UK19D4S+T specifies the reset timeout period: 'D4' corresponds to a minimum reset timeout of 1200ms, with typical and maximum values of 1800ms and 2400ms respectively (Table 4, Reset Timeout Periods). This extended hold time ensures full initialization of complex microcontrollers and peripherals before release, critical in medical devices with multi-stage boot sequences.
Is the MAX6865UK19D4S+T pin-compatible with other devices in the MAX68xx family?
Yes, the MAX6865UK19D4S+T uses the standard 5-pin SOT23-5 package and shares identical pinout with MAX6864/MAX6866/MAX6867/MAX6869 variants: Pin 1 = RESET (active-low push-pull), Pin 2 = GND, Pin 3 = MR, Pin 4 = WDI, Pin 5 = VCC. This allows direct substitution within the MAX6864–MAX6869 series when matching VTH, tRP, and tWD requirements - confirmed in the Pin Configurations section (page 15) and Selector Guide (page 16).
What is the supply current specification for MAX6865UK19D4S+T under typical operating conditions?
The MAX6865UK19D4S+T draws 170nA typical supply current at VCC = 1.8V and TA = +25°C, as specified in the Electrical Characteristics table (page 2). This ultra-low ICC is measured with VCC > VTH and reset output deasserted. At VCC = 2.5V, typical ICC rises to 190nA; at VCC = 3.3V, it is 210nA. These values enable multi-year operation in battery-powered medical wearables - a defining feature of the MAX6864–MAX6869 nanopower supervisory family.
MAX6865UK19D4S+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:
- 1.9V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 1.2s Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6865UK19D4S+T FAQ
1.How can I place an order for MAX6865UK19D4S+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6865UK19D4S+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 MAX6865UK19D4S+T reliable?
The price and inventory of MAX6865UK19D4S+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6865UK19D4S+T is usually 5 days.
3.What payment methods are accepted for MAX6865UK19D4S+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6865UK19D4S+T transactions.
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4.How is shipping managed for MAX6865UK19D4S+T?
MAX6865UK19D4S+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6865UK19D4S+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 MAX6865UK19D4S+T?
For technical support, including MAX6865UK19D4S+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6865UK19D4S+T requirements.
6.How does Aetrix verify that MAX6865UK19D4S+T is sourced from the original manufacturer or authorized distributors?
All MAX6865UK19D4S+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 MAX6865UK19D4S+T meets industry standards.
7.What is the process for return or replacement of MAX6865UK19D4S+T?
All MAX6865UK19D4S+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6865UK19D4S+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 MAX6865UK19D4S+T part is unused and in its original packaging.
Return procedure for MAX6865UK19D4S+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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