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Analog Devices Inc./Maxim Integrated MAX6855UK37D6+T
- Part No.:
- MAX6855UK37D6+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6855UK37D6+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,683
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Product details
Overview
The MAX6855UK37D6+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in a 5-pin SOT23 package, featuring ultra-low 170nA typical supply current, factory-trimmed 3.7V reset threshold (±2.5%), and 600–1200ms minimum reset timeout period. It provides active-low push-pull reset output, manual reset input (MR), and operates across -40°C to +85°C - used in battery-powered glucose monitors and portable medical devices for reliable power-on reset and brownout protection.
For engineers reviewing the MAX6855UK37D6+T datasheet, MAX6855UK37D6+T pinout, MAX6855UK37D6+T application, or MAX6855UK37D6+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 in space-constrained embedded systems.
Technical Context
This device integrates voltage monitoring, manual reset assertion, and reset timing control into a single monolithic BiCMOS IC. Its internal comparator continuously monitors VCC against a precision bandgap-derived 3.7V threshold, while an on-chip timer enforces a minimum 600ms (typ. 900ms) reset pulse width after VCC recovery or MR deassertion.
The MR input features 10kΩ internal pullup, 1µs minimum pulse width support, and 200ns glitch rejection - enabling direct connection to momentary switches or open-drain logic without external debounce. Reset output remains valid and functional even as VCC declines to 1.1V, ensuring deterministic µP initialization during deep brownout conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current | 170nA typ at +25°C - enables multi-year operation on coin-cell batteries in always-on medical sensors. |
| Reset Threshold | 3.700V ±2.5% - factory-trimmed to match 3.3V system rails with margin; valid down to VCC = +1.1V. |
| Reset Timeout | 600–1200ms min (D6 option) - ensures full µP boot sequence completion before release. |
| Output Type | Active-low push-pull - drives reset line directly without external pullup; sinks 1.2mA at VCC ≥ 2.38V. |
| Operating Temp | -40°C to +85°C - qualified for industrial and portable medical equipment environments. |
| VCC Range | 1.2V to 5.5V - supports Li-ion, alkaline, and regulated 1.8V/2.5V/3.3V/5V supply domains. |
Pinout & Package
Package: 5-pin SOT23-5 (2.9mm × 1.6mm × 1.1mm), lead-free, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-low push-pull reset output; asserts low during VCC undervoltage, MR activation, or timeout expiration; referenced to VCC. |
| 2 | GND | Ground reference for all internal circuitry; must be connected to system ground plane with low-impedance path. |
| 3 | MR | Active-low manual reset input; internally pulled up to VCC via 10kΩ; accepts CMOS logic or open-drain signals. |
| 4 | GND | Second ground terminal - electrically tied to Pin 2 internally; improves noise immunity in high-frequency layouts. |
| 5 | VCC | Primary supply input and monitored rail; requires 0.1µF ceramic bypass capacitor to GND for stability. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 170nA typical supply current enables >10-year battery life in glucose meters using CR2032 cells. |
| Reset Validity | Guaranteed RESET functionality down to VCC = +1.1V - ensures reliable reset assertion during deep brownout. |
| Transient Immunity | Immune to VCC glitches ≤40µs duration at 100mV overdrive - prevents spurious resets in noisy power environments. |
| No External Components | Self-contained supervision: no capacitors, resistors, or trimming required for basic reset functionality. |
| MR Glitch Rejection | 200ns minimum pulse rejection on MR input - eliminates false triggers from ESD or PCB coupling noise. |
Applications
| Glucose Monitoring Systems | Patient Vital Sign Monitors |
|---|---|
|
Use Scenario: Portable handheld glucose meters powered by single CR2032 coin cell with intermittent usage over 2+ years. IC Role / Device Role: Primary power-on reset supervisor ensuring µP initializes correctly after cold start or battery insertion. Use Value: 170nA quiescent current extends battery service life beyond 10,000 measurements; 3.7V threshold matches nominal 3.3V rail with safety margin. |
Use Scenario: Battery-backed wearable patient monitors measuring SpO₂, heart rate, and respiration continuously for 72+ hours. IC Role / Device Role: Brownout detector that asserts reset when main Li-ion drops below 3.7V during discharge cycle. Use Value: Guaranteed reset validity to VCC = +1.1V prevents undefined µP state during final battery depletion; D6 timeout ensures full firmware reload. |
| Industrial Handheld Scanners | Smart Wearable Health Trackers |
|
Use Scenario: Ruggedized barcode scanners used in warehouse logistics with frequent drop-induced power interruptions. IC Role / Device Role: Supervisory circuit coordinating clean reset of ARM Cortex-M0 host after VCC sag or MR button press. Use Value: 200ns MR glitch rejection prevents accidental resets from mechanical switch bounce; 600ms min timeout accommodates slow LDO recovery. |
Use Scenario: Ultra-thin wrist-worn trackers with constrained PCB area and strict power budget (<5µA avg). IC Role / Device Role: System-level reset manager interfacing with low-power BLE SoC and analog sensor front-end. Use Value: SOT23-5 footprint saves >2.5mm² vs. SC70; no external components reduce BOM count and assembly cost in high-volume production. |
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; 1.5µA ICC; SOT23-5 | Lacks MR input; lower accuracy (±2.5% vs. ±2.5%); higher ICC reduces battery life | Select only if 3.08V threshold aligns with 3.3V rail and MR functionality is unnecessary. |
| MAX6361LUR29+T | 2.93V threshold; 140ms timeout; 1.2µA ICC; no MR; SOT23-5 | Higher supply current; no manual reset; shorter timeout unsuitable for complex boot sequences | Consider only for cost-sensitive, non-MR applications where 2.93V threshold matches design. |
Compared with TPS3836K33DBVR and MAX6361LUR29+T, the MAX6855UK37D6+T delivers 7× lower supply current, integrated MR input, longer configurable reset timeout, and identical 5-pin SOT23 footprint - making it optimal for long-life, feature-complete portable medical designs.
Availability
MAX6855UK37D6+T is available at Aetrix Electronics and suitable for glucose monitoring systems, patient vital sign monitors, and industrial handheld scanners requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for MAX6855UK37D6+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 MAX685x family was designed specifically for ultra-low-power microprocessor supervision in battery-critical portable medical and consumer electronics - prioritizing nanoscale ICC, precise voltage thresholds, and robust transient immunity.
FAQ
What is the exact reset threshold voltage of the MAX6855UK37D6+T?
The MAX6855UK37D6+T has a factory-trimmed reset threshold of 3.700V with ±2.5% tolerance over temperature (-40°C to +85°C), corresponding to suffix "37" per Maxim's Threshold Suffix Guide. This value is laser-trimmed during production and guaranteed in the Electrical Characteristics table under VTH parameter.
Does the MAX6855UK37D6+T include a watchdog timer function?
No, the MAX6855UK37D6+T does not include a watchdog timer. It belongs to the MAX6854/MAX6855/MAX6856 subgroup, which provides voltage monitoring and manual reset only. Watchdog capability is exclusive to MAX6864–MAX6869 variants (e.g., MAX6864UK37D6S+T), identifiable by the "S" or "L" suffix in the ordering code.
What is the function of Pin 4 on the MAX6855UK37D6+T?
Pin 4 on the MAX6855UK37D6+T is a second ground (GND) terminal, electrically connected internally to Pin 2. Its inclusion improves noise immunity and thermal performance in high-density layouts by providing dual low-inductance ground paths - critical for stable reset assertion in EMI-prone portable medical devices.
Can the MAX6855UK37D6+T operate with a 1.8V supply?
Yes, the MAX6855UK37D6+T operates across VCC = 1.2V to 5.5V. At 1.8V, its supply current is 170nA (typ), reset threshold remains 3.7V (so it will assert reset immediately), and RESET output maintains VOL ≤ 0.3V at ISINK = 500µA - confirming functionality as a reset supervisor for higher-voltage rails even when powered from a lower auxiliary supply.
Is the MAX6855UK37D6+T pin-compatible with other MAX685x devices?
Yes, all MAX6854/MAX6855/MAX6856/MAX6858/MAX6860–MAX6869 devices share identical 5-pin SOT23-5 pinouts and footprints. The MAX6855UK37D6+T uses Pins 1 (RESET), 2 (GND), 3 (MR), 4 (GND), and 5 (VCC), matching the standard configuration - enabling drop-in replacement within the same functional subgroup (MR-enabled, no WDI).
MAX6855UK37D6+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:
- 3.7V
- 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
MAX6855UK37D6+T FAQ
1.How can I place an order for MAX6855UK37D6+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6855UK37D6+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 MAX6855UK37D6+T reliable?
The price and inventory of MAX6855UK37D6+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6855UK37D6+T is usually 5 days.
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Once your MAX6855UK37D6+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 MAX6855UK37D6+T?
For technical support, including MAX6855UK37D6+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6855UK37D6+T requirements.
6.How does Aetrix verify that MAX6855UK37D6+T is sourced from the original manufacturer or authorized distributors?
All MAX6855UK37D6+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 MAX6855UK37D6+T meets industry standards.
7.What is the process for return or replacement of MAX6855UK37D6+T?
All MAX6855UK37D6+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6855UK37D6+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 MAX6855UK37D6+T part is unused and in its original packaging.
Return procedure for MAX6855UK37D6+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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