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Analog Devices Inc./Maxim Integrated MAX6855UK36D2+T
- Part No.:
- MAX6855UK36D2+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6855UK36D2+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,300
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Product details
Overview
MAX6855UK36D2+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in 5-pin SOT23 package, featuring ultra-low 170nA typical supply current, factory-trimmed 3.6V reset threshold (±2.5%), and 40ms minimum reset timeout period. It monitors VCC, provides active-low push-pull RESET output, and includes manual reset (MR) input - used to ensure reliable boot-up and brownout recovery in battery-powered medical and portable electronics.
For engineers reviewing the MAX6855UK36D2+T datasheet, MAX6855UK36D2+T pinout, MAX6855UK36D2+T application, or MAX6855UK36D2+T equivalent, key selection criteria include guaranteed reset validity down to VCC = +1.1V, immunity to short VCC transients (<40µs at 100mV overdrive), no external components required, and compatibility with CMOS-level MR signaling.
Technical Context
The MAX6855UK36D2+T implements a precision voltage monitor with hysteresis (0.5% of VTH) and a fixed-reset-timer architecture that asserts RESET for ≥40ms after VCC rises above 3.6V and MR deasserts. Its internal 10kΩ MR pullup enables direct connection to momentary switches without external biasing.
Unlike watchdog-equipped variants (e.g., MAX6864–MAX6869), the MAX6855UK36D2+T omits WDI and CT pins, simplifying design for applications requiring only power-on reset and manual reset - with timing fully determined by factory-trimmed thresholds and D2 timeout option.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.600V ±2.5% (factory-trimmed; ensures reliable detection of 3.3V rail brownout) |
| Supply Current | 170nA typical at +25°C (enables >10-year battery life in glucose monitors) |
| Reset Timeout | 40ms minimum (D2 option; meets µP power-up stabilization requirements) |
| Operating Voltage | 1.2V to 5.5V (supports single-cell Li-ion, 3.3V, and 5V systems) |
| Reset Output Type | Active-low push-pull (drives RESET directly to GND or VCC; no pullup needed) |
| VCC Validity Limit | RESET remains valid down to VCC = +1.1V (guaranteed logic-level integrity during deep brownout) |
| MR Input Logic | Active-low with 10kΩ internal pullup to VCC (enables switch-to-GND manual reset without external resistor) |
Pinout & Package
MAX6855UK36D2+T is housed in a RoHS-compliant 5-pin SOT23-5 package (2.9mm × 1.6mm × 1.1mm), optimized for space-constrained portable designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-low push-pull output; drives low during reset assertion and high when deasserted - compatible with standard µP reset inputs without external components |
| 2, 4 | GND | Ground reference for all internal circuits; both pins must be connected to system ground for noise immunity and specification compliance |
| 3 | MR | Active-low manual reset input; internally pulled up to VCC via 10kΩ; accepts CMOS logic or open-drain signals; 1µs minimum pulse width |
| 5 | VCC | Supply voltage input and monitored rail; requires 0.1µF bypass capacitor to GND for transient suppression per datasheet recommendation |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 170nA typical supply current enables multi-year operation on coin-cell batteries in patient monitors |
| No external components | Integrated MR pullup, precision voltage reference, and reset timer eliminate BOM cost and layout area |
| VCC transient immunity | Immune to <40µs VCC glitches at 100mV overdrive - prevents spurious resets in noisy automotive or industrial environments |
| Guaranteed reset validity | RESET signal remains electrically valid down to VCC = +1.1V - ensures deterministic behavior during deep undervoltage conditions |
| SOT23-5 footprint | Industry-standard 5-pin package enables drop-in replacement for TPS3836/TPS3837/TPS3838 in existing layouts |
Applications
| Glucose Monitoring Systems | Patient Vital Sign Monitors |
|---|---|
Use Scenario: Portable handheld glucose meters powered by CR2032 coin cell with intermittent usage over 3+ years. IC Role / Device Role / Timing Role: Supervisory IC asserting reset during cold-start and low-battery brownout to prevent corrupted ADC readings or EEPROM writes. Use Value: 170nA ICC extends battery life beyond 36 months; 3.6V threshold matches nominal 3.3V LDO output; 40ms tRP satisfies MSP430F2xx power-up timing. |
Use Scenario: Battery-backed bedside patient monitors with dual-supply architecture (3.3V logic, 5V analog). IC Role / Device Role / Timing Role: Primary VCC supervisor for 3.3V domain, coordinating safe boot sequence and enabling MR-triggered self-test initiation. Use Value: Push-pull RESET eliminates need for external pullup; guaranteed validity to 1.1V prevents metastability during AC loss + battery switchover. |
| Industrial Handheld Scanners | Wearable Health Trackers |
Use Scenario: Ruggedized barcode scanners operating in warehouses with wide temperature (-40°C to +85°C) and ESD-prone environments. IC Role / Device Role / Timing Role: Brownout detector and manual reset enabler for ARM Cortex-M0 host MCU during hot-swap battery changes. Use Value: MR pin supports hardware-initiated firmware update mode; 10kΩ internal pullup reduces component count; SOT23-5 withstands reflow and mechanical stress. |
Use Scenario: Ultra-thin wrist-worn trackers using single-cell LiPo (2.7–4.2V) with aggressive power gating. IC Role / Device Role / Timing Role: Power-rail supervisor ensuring clean reset during wake-from-sleep transitions and low-Vbat recovery. Use Value: 3.6V threshold avoids false triggers during LiPo discharge curve; 40ms tRP aligns with nRF52832 reset hold time; 170nA ICC minimizes quiescent drain. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3836K33DBVR | 3.08V fixed threshold; 200ms reset timeout; 1.6µA ICC at 3.3V | Higher supply current limits battery lifetime; longer timeout may delay system recovery | Select when 3.08V threshold better matches 3.0V rail; verify µP reset hold time compatibility with 200ms tRP |
| MAX6315US36D2+T | Same 3.6V threshold and 40ms timeout; 1.2µA ICC at 2.5V; SOT23-5 package | 10x higher supply current reduces battery life in always-on devices | Prefer MAX6855UK36D2+T for nanopower designs; use MAX6315 only if legacy qualification or alternate sourcing required |
Compared with TPS3836K33DBVR and MAX6315US36D2+T, the MAX6855UK36D2+T delivers superior energy efficiency (170nA vs. µA-range ICC) while maintaining identical reset threshold and timeout - making it the optimal choice for long-life, battery-critical medical and portable applications.
Availability
MAX6855UK36D2+T is available at Aetrix Electronics and suitable for glucose monitoring systems, patient vital sign monitors, industrial handheld scanners, and wearable health trackers requiring stable component supply across extended production lifecycles.
Supply support for MAX6855UK36D2+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, medical, and communications applications.
The MAX6855UK36D2+T belongs to the MAX6854–MAX6869 nanopower supervisory family, designed specifically for ultra-low-power, space-constrained battery-operated systems where reset reliability and energy efficiency are critical.
FAQ
What is the exact reset threshold voltage of MAX6855UK36D2+T?
The MAX6855UK36D2+T has a factory-trimmed reset threshold of 3.600V with ±2.5% tolerance over -40°C to +85°C. This value is confirmed in Table 2 (Threshold Suffix Guide) of the datasheet, where suffix "36" corresponds to VTH = 3.600V. The MAX6855UK36D2+T maintains this accuracy without calibration or external components.
Does MAX6855UK36D2+T include a watchdog timer function?
No, the MAX6855UK36D2+T does not include a watchdog timer. It is a dedicated voltage monitor and manual reset supervisor. Watchdog functionality is only present in MAX6864–MAX6869 variants (e.g., MAX6864UK36D2S+T), which add WDI pin and selectable timeout options. The MAX6855UK36D2+T pinout omits WDI and contains only VCC, GND, MR, and RESET pins.
What is the reset timeout period for MAX6855UK36D2+T?
The MAX6855UK36D2+T uses the D2 reset timeout option, providing a minimum reset pulse width of 40ms. This is specified in the part number suffix "D2" and verified in Table 4 (Reset Timeout Periods) of the datasheet, where D2 = 40ms (min), 60ms (typ), 80ms (max). The timeout begins after VCC exceeds 3.6V and MR is deasserted.
Is MAX6855UK36D2+T pin-compatible with other supervisory ICs?
Yes, the MAX6855UK36D2+T is pin-compatible with the TPS3836/TPS3837/TPS3838 series in SOT23-5 package, as explicitly stated in the Features section of the datasheet. Pin mapping (VCC, GND, MR, RESET, GND) matches exactly, enabling direct replacement where 3.6V threshold and 40ms timeout meet system requirements.
What is the maximum operating temperature range for MAX6855UK36D2+T?
The MAX6855UK36D2+T is rated for operation from -40°C to +85°C, as confirmed in the Ordering Information table and Absolute Maximum Ratings section. This industrial temperature range is supported across all electrical specifications, including reset threshold accuracy, supply current, and reset timeout stability.
MAX6855UK36D2+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:
- 3.6V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 40ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6855UK36D2+T FAQ
1.How can I place an order for MAX6855UK36D2+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6855UK36D2+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 MAX6855UK36D2+T reliable?
The price and inventory of MAX6855UK36D2+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6855UK36D2+T is usually 5 days.
3.What payment methods are accepted for MAX6855UK36D2+T?
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4.How is shipping managed for MAX6855UK36D2+T?
MAX6855UK36D2+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6855UK36D2+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 MAX6855UK36D2+T?
For technical support, including MAX6855UK36D2+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6855UK36D2+T requirements.
6.How does Aetrix verify that MAX6855UK36D2+T is sourced from the original manufacturer or authorized distributors?
All MAX6855UK36D2+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 MAX6855UK36D2+T meets industry standards.
7.What is the process for return or replacement of MAX6855UK36D2+T?
All MAX6855UK36D2+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6855UK36D2+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 MAX6855UK36D2+T part is unused and in its original packaging.
Return procedure for MAX6855UK36D2+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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