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Analog Devices Inc./Maxim Integrated MAX6855UK36D3+T
- Part No.:
- MAX6855UK36D3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6855UK36D3+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,669
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Product details
Overview
The MAX6855UK36D3+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 3.6V reset threshold (±2.5%), and 150ms minimum reset timeout period. It provides active-high push-pull RESET output, manual reset input (MR), and operates across -40°C to +85°C - designed for reliable power-on reset and brownout protection in battery-powered medical and portable electronics.
For engineers reviewing the MAX6855UK36D3+T datasheet, MAX6855UK36D3+T pinout, MAX6855UK36D3+T application, or MAX6855UK36D3+T equivalent, key selection criteria include its 3.6V VTH tolerance, guaranteed RESET validity down to VCC = 1.1V, immunity to short VCC transients (<40µs at 100mV overdrive), and compatibility with low-voltage µP systems requiring minimal quiescent current.
Technical Context
This device integrates voltage monitoring, manual reset assertion, and timing-controlled reset deassertion in a single BiCMOS IC. Its internal 10kΩ MR pullup eliminates external components, while the push-pull active-high RESET output drives directly into µP reset inputs without external biasing.
The reset logic asserts when VCC falls below 3.6V (±2.5%), MR is pulled low, or - unlike MAX6855 - no watchdog timer is present. After VCC recovers above threshold and MR releases, the 150ms minimum timeout ensures stable µP initialization before release.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold (VTH) | 3.600V ±2.5% - factory-trimmed for precise brownout detection at nominal 3.6V rail |
| Supply Current (ICC) | 170nA typ at VCC = 1.8V - enables multi-year operation on coin-cell batteries |
| Reset Timeout (tRP) | 150ms min - ensures µP completes power-rail stabilization and internal state reset |
| VCC Operating Range | 1.2V to 5.5V - supports wide-input LDO outputs and Li-ion/Li-Po battery systems |
| RESET Validity Limit | Guaranteed to VCC = 1.1V - maintains valid logic high during deep brownout recovery |
| MR Input Threshold | VIL = 0.3×VCC, VIH = 0.7×VCC - compatible with CMOS-level control signals |
| Output Type | Push-pull active-high RESET - eliminates need for external pullup resistor |
Pinout & Package
Package: 5-pin SOT23-5, lead-free, surface-mount, footprint-compatible with industry-standard 5-pin SOT23.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-high push-pull reset output - drives µP reset pin directly; sinks/source up to 500µA |
| 2 | GND | Ground reference - must be connected to system ground plane for noise immunity |
| 3 | MR | Active-low manual reset input - internally pulled up to VCC via 10kΩ; accepts CMOS logic |
| 4 | GND | Second ground terminal - electrically tied to Pin 2 internally; improves thermal and EMI performance |
| 5 | VCC | Supply voltage input - monitors own power rail; requires 0.1µF bypass capacitor to GND |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 170nA typical supply current enables >10-year battery life in glucose monitors and wearables |
| No external components | Integrated 10kΩ MR pullup and precision bandgap reference eliminate BOM parts and layout area |
| VCC transient immunity | Immune to <40µs VCC glitches at 100mV overdrive - prevents spurious resets in noisy environments |
| Valid RESET at low VCC | RESET remains logic-high down to VCC = 1.1V - ensures deterministic reset behavior during brownout |
| SOT23-5 footprint | Industry-standard 5-pin SOT23 package enables drop-in replacement and automated assembly |
Applications
| Glucose Monitors | Patient Monitors |
|---|---|
Use Scenario: Continuous blood glucose sensing in handheld or wearable devices powered by CR2032 coin cells. IC Role / Device Role / Timing Role: Supervises 3.3V LDO output and triggers µP reset on battery sag or cold-start conditions. Use Value: 170nA ICC extends battery life beyond 2 years; 150ms tRP ensures ADC calibration completes before firmware boot. |
Use Scenario: Portable ECG or SpO₂ units operating from rechargeable Li-ion packs with variable voltage discharge profiles. IC Role / Device Role / Timing Role: Monitors main 3.6V system rail and asserts reset if voltage drops below safe operating margin during peak current draw. Use Value: 3.6V ±2.5% VTH matches typical Li-ion cutoff voltage; push-pull RESET avoids pullup leakage in low-power sleep states. |
| MP3 Players | Cell Phones (Legacy Feature Phones) |
Use Scenario: Flash-based audio players using single-cell Li-ion (2.7–4.2V) with integrated µP and codec. IC Role / Device Role / Timing Role: Provides clean power-on reset and brownout recovery for ARM7-based controller and audio subsystem. Use Value: Immunity to 40µs VCC transients prevents reset corruption during headphone insertion or button press noise coupling. |
Use Scenario: Entry-level GSM handsets with dual-rail power (3.6V core, 2.8V I/O) and tight PCB space constraints. IC Role / Device Role / Timing Role: Supervises 3.6V core rail and synchronizes reset release with PMIC sequencing. Use Value: SOT23-5 footprint minimizes board area; guaranteed RESET validity to 1.1V supports graceful shutdown during rapid battery depletion. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3837K33DBVR | 3.3V fixed threshold, 200ms timeout, 1.2µA ICC - higher quiescent current, no MR input | Lacks manual reset capability; suited for simpler reset-only systems without operator intervention | Select when only voltage monitoring is required and 1.2µA ICC is acceptable in battery design |
| MAX6315US36D3+T | Same 3.6V threshold and 150ms timeout, but open-drain RESET output and 2.5µA ICC | Requires external pullup; higher ICC reduces battery life in ultra-low-power applications | Choose only if open-drain interface is mandatory for level-shifting or wired-OR reset bus |
Compared with TPS3837K33DBVR and MAX6315US36D3+T, the MAX6855UK36D3+T delivers the lowest ICC (170nA vs. µA-range), integrated MR functionality, and push-pull active-high RESET - making it optimal for space-constrained, long-life medical and portable designs where every nanoamp counts.
Availability
MAX6855UK36D3+T is available at Aetrix Electronics and suitable for glucose monitors, patient monitors, and MP3 players requiring stable component supply with guaranteed long-term availability and lead-free compliance.
Supply support for MAX6855UK36D3+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, mixed-signal, and power management ICs for demanding industrial, medical, and communications applications.
The MAX6855UK36D3+T belongs to Maxim's nanopower µP supervisory family, engineered specifically for battery-critical portable and medical electronics requiring sub-µA quiescent current and robust reset reliability.
FAQ
What is the exact reset threshold voltage of the MAX6855UK36D3+T?
The MAX6855UK36D3+T has a factory-trimmed reset threshold of 3.600V 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 "36" corresponds to VTH = 3.600V. The MAX6855UK36D3+T maintains this accuracy without external calibration.
Does the MAX6855UK36D3+T include a watchdog timer function?
No, the MAX6855UK36D3+T does not include a watchdog timer. Per the Selector Guide and Pin Description sections, only MAX6864–MAX6869 variants feature WDI input and watchdog timeout functionality. The MAX6855UK36D3+T provides voltage monitoring, manual reset (MR), and fixed 150ms reset timeout - no watchdog circuitry is present.
What is the function of Pin 4 on the MAX6855UK36D3+T?
Pin 4 on the MAX6855UK36D3+T is a second GND terminal, electrically connected internally to Pin 2. Its inclusion improves thermal dissipation and reduces ground impedance in high-noise environments. Both GND pins must be soldered to the PCB ground plane per the recommended layout in the datasheet.
Can the MAX6855UK36D3+T operate with a 1.8V supply?
Yes, the MAX6855UK36D3+T operates with VCC as low as 1.2V and up to 5.5V. At 1.8V, its supply current is 170nA (typ), reset threshold remains 3.6V ±2.5%, and RESET output is guaranteed valid down to VCC = 1.1V - enabling use with low-dropout regulators feeding 3.6V rails from 1.8V sources.
Is the MAX6855UK36D3+T pin-compatible with the TPS3837 series?
Yes, the MAX6855UK36D3+T is pin-compatible with TPS3837/TPS3838 devices per the datasheet's Features section, which explicitly states "Pin Compatible to the TPS3837/TPS3838". Both use 5-pin SOT23 packages with identical pinout (RESET, GND, MR, GND, VCC), enabling direct substitution where 3.6V threshold and 150ms timeout meet system requirements.
MAX6855UK36D3+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:
- 150ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6855UK36D3+T FAQ
1.How can I place an order for MAX6855UK36D3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6855UK36D3+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 MAX6855UK36D3+T reliable?
The price and inventory of MAX6855UK36D3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6855UK36D3+T is usually 5 days.
3.What payment methods are accepted for MAX6855UK36D3+T?
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4.How is shipping managed for MAX6855UK36D3+T?
MAX6855UK36D3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6855UK36D3+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 MAX6855UK36D3+T?
For technical support, including MAX6855UK36D3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6855UK36D3+T requirements.
6.How does Aetrix verify that MAX6855UK36D3+T is sourced from the original manufacturer or authorized distributors?
All MAX6855UK36D3+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 MAX6855UK36D3+T meets industry standards.
7.What is the process for return or replacement of MAX6855UK36D3+T?
All MAX6855UK36D3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6855UK36D3+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 MAX6855UK36D3+T part is unused and in its original packaging.
Return procedure for MAX6855UK36D3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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