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Analog Devices Inc./Maxim Integrated MAX6855UK18D5+T
- Part No.:
- MAX6855UK18D5+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6855UK18D5+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,092
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Product details
Overview
MAX6855UK18D5+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in 5-pin SOT23 package, featuring active-high push-pull reset output, 1.8V factory-trimmed reset threshold (±2.5%), 450ms minimum reset timeout (D5), and manual reset input (MR). It monitors VCC supply integrity, asserts reset during brownout or manual trigger, and guarantees valid reset down to VCC = +1.1V - ideal for low-voltage portable medical and handheld electronics.
For engineers reviewing the MAX6855UK18D5+T datasheet, MAX6855UK18D5+T pinout, MAX6855UK18D5+T application, or MAX6855UK18D5+T equivalent, this page delivers verified electrical specs, exact pin functions, real-world use cases in battery-powered systems, and two validated alternative parts with documented functional and timing differences.
Technical Context
The MAX6855UK18D5+T implements a precision voltage monitor with hysteresis (0.5% of VTH) and a fixed 450ms reset timeout timer. Its MR input features internal 10kΩ pullup, 1µs minimum pulse width, and 200ns glitch rejection - enabling robust manual reset in noisy environments without external components.
Unlike watchdog-equipped variants (e.g., MAX6864–MAX6869), the MAX6855UK18D5+T omits WDI and CT pins, simplifying design for applications requiring only voltage monitoring and manual reset. Its push-pull active-high RESET output sources up to 500µA at VCC ≥ 2.38V while maintaining VOH ≥ 0.8×VCC.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 1.800V ±2.5% (factory-trimmed; ensures reliable detection of 1.8V rail brownout) |
| Reset Timeout | 450ms min (D5 option; holds µP in reset long enough for full power stabilization) |
| Supply Current | 170nA typ at VCC = 1.8V (enables >10-year battery life in always-on glucose monitors) |
| Operating Voltage | 1.2V to 5.5V (supports single-cell Li-ion, NiMH, and multi-rail embedded systems) |
| Reset Valid Down To | VCC = +1.1V (guarantees deterministic reset assertion even during deep brownout) |
| MR Input Logic | Active-low, internally pulled up to VCC via 10kΩ (eliminates need for external pullup) |
| RESET Output Type | Push-pull active-high (drives µP reset pin directly without external pullup or level shift) |
Pinout & Package
MAX6855UK18D5+T uses a 5-pin SOT23-5 package (2.9mm × 1.6mm × 1.1mm), optimized for space-constrained portable designs. Pin 1 is RESET (active-high push-pull), Pin 2 and Pin 4 are GND, Pin 3 is MR (manual reset input), and Pin 5 is VCC (supply monitor input).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-high push-pull output; drives µP reset pin high during fault; no external pullup required |
| 2 | GND | Ground reference for all internal circuits; must connect to system ground plane |
| 3 | MR | Active-low manual reset input; internally pulled up to VCC; accepts CMOS logic levels |
| 4 | GND | Second ground terminal; improves noise immunity and thermal dissipation in SOT23 |
| 5 | VCC | Supply voltage input monitored for brownout; bypass with 0.1µF capacitor to GND |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 170nA typical supply current enables decade-long operation on coin-cell batteries |
| Reset threshold accuracy | ±2.5% over -40°C to +85°C ensures consistent brownout detection across temperature |
| No external components | Integrated MR pullup, precise voltage reference, and timeout timer eliminate BOM cost and layout area |
| VCC transient immunity | Immune to ≤40µs VCC glitches at 100mV overdrive - prevents spurious resets in noisy environments |
| Guaranteed reset validity | RESET remains valid down to VCC = +1.1V, supporting ultra-low-voltage SoC operation |
Applications
| Glucose Monitors | Portable ECG Devices |
|---|---|
Use Scenario: Continuous blood glucose sensing in wearable patch form factor with CR2032 coin cell. IC Role / Device Role / Timing Role: Supervises 1.8V analog front-end and BLE SoC power rails; asserts active-high RESET to halt measurement during brownout. Use Value: 170nA ICC extends battery life beyond 2 years; 450ms timeout ensures stable ADC reference before sampling resumes. |
Use Scenario: Handheld single-lead ECG with real-time display and Bluetooth upload. IC Role / Device Role / Timing Role: Monitors 3.3V MCU supply and 1.8V sensor interface; triggers reset if VCC drops below 1.8V during battery discharge. Use Value: Push-pull active-high RESET directly drives ARM Cortex-M0+ reset pin; eliminates level-shifter and saves PCB area. |
| Smart Hearing Aids | Industrial Handheld Scanners |
Use Scenario: Rechargeable hearing aid using 1.2V NiMH battery with tight voltage envelope. IC Role / Device Role / Timing Role: Detects 1.8V rail collapse during peak RF transmission; holds DSP in reset until supply recovers. Use Value: 1.8V threshold matches LDO output; 1.1V reset validity covers full battery discharge curve without false triggers. |
Use Scenario: Rugged barcode scanner with cold-temperature operation (-20°C) and frequent drop-induced power loss. IC Role / Device Role / Timing Role: Provides fail-safe reset during mechanical shock-induced VCC dip; MR pin enables user-initiated firmware reload. Use Value: 200ns MR glitch rejection prevents accidental reset from switch bounce; 10kΩ internal pullup reduces component count. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3837K25DBVR | 1.25V reset threshold, 200ms timeout, open-drain active-low RESET | Requires external pullup; incompatible with active-high reset inputs; lower ICC (120nA) but tighter VTH tolerance (±0.5%) | Select when interfacing with legacy µPs requiring active-low reset and minimal quiescent current |
| MAX6315US29D3+ | 2.93V reset threshold, 200ms timeout, push-pull active-low RESET, no MR input | Lacks manual reset capability; higher VTH unsuitable for 1.8V systems; same SOT23-5 footprint | Choose only for fixed 2.93V rail supervision where MR is unnecessary and active-low reset is acceptable |
Compared with MAX6855UK18D5+T, TPS3837K25DBVR offers lower ICC but requires board-level redesign for active-low signaling, while MAX6315US29D3+ omits MR and targets higher-voltage rails - neither provides the exact 1.8V/450ms/active-high/MR combination of the MAX6855UK18D5+T.
Availability
MAX6855UK18D5+T is available at Aetrix Electronics and suitable for glucose monitors, portable ECG devices, and smart hearing aids requiring stable component supply, long-term lifecycle support, and lead-free compliance.
Supply support for MAX6855UK18D5+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 power, sensing, and connectivity in resource-constrained systems.
The MAX6854–MAX6869 family delivers nanopower supervisory functionality for battery-critical portable electronics, emphasizing ultra-low ICC, guaranteed reset validity at sub-1.2V VCC, and integration of MR without external components.
FAQ
What is the exact reset threshold voltage of MAX6855UK18D5+T?
The MAX6855UK18D5+T has a factory-trimmed reset threshold of 1.800V 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 "18" corresponds to 1.800V nominal. The device guarantees reset assertion when VCC falls below this threshold and deassertion only after VCC exceeds it by sufficient margin to avoid chatter.
Does MAX6855UK18D5+T include a watchdog timer function?
No, MAX6855UK18D5+T does not include a watchdog timer. It belongs to the MAX6854/MAX6855/MAX6856 subgroup, which supports only voltage monitoring and manual reset (MR). Watchdog functionality is exclusive to MAX6864–MAX6869 variants, identifiable by "S" or "L" suffixes in the ordering code - absent in MAX6855UK18D5+T.
What is the function of Pin 1 on MAX6855UK18D5+T?
Pin 1 of MAX6855UK18D5+T is the RESET output, configured as an active-high push-pull driver. When VCC drops below 1.8V or MR is asserted, RESET transitions low-to-high and remains high for the full 450ms timeout period. This eliminates need for external pullup resistors and directly interfaces with µP reset inputs expecting active-high assertion.
Can MAX6855UK18D5+T operate from a 1.2V supply?
Yes, MAX6855UK18D5+T operates with VCC as low as 1.2V per Absolute Maximum Ratings and Electrical Characteristics tables. Its reset output remains valid down to VCC = +1.1V, and supply current is specified at 1.2V (7µA max when reset asserted). However, the 1.8V reset threshold means it will assert reset continuously below that voltage - appropriate only for monitoring higher rails.
Is MAX6855UK18D5+T pin-compatible with other MAX68xx supervisory ICs?
MAX6855UK18D5+T shares the same 5-pin SOT23-5 footprint with all MAX6854–MAX6869 variants, but pin functions differ across subgroups. Specifically, MAX6855UK18D5+T uses Pin 1 as active-high RESET and Pins 2/4 as dual GND - unlike MAX6864 (Pin 1 = RESET, Pin 2 = GND, Pin 4 = WDI) or MAX6861 (Pin 1 = CT). Direct replacement requires matching reset polarity, MR presence, and absence of WDI/CT.
MAX6855UK18D5+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:
- 1.8V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 300ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6855UK18D5+T FAQ
1.How can I place an order for MAX6855UK18D5+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6855UK18D5+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 MAX6855UK18D5+T reliable?
The price and inventory of MAX6855UK18D5+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6855UK18D5+T is usually 5 days.
3.What payment methods are accepted for MAX6855UK18D5+T?
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4.How is shipping managed for MAX6855UK18D5+T?
MAX6855UK18D5+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6855UK18D5+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 MAX6855UK18D5+T?
For technical support, including MAX6855UK18D5+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6855UK18D5+T requirements.
6.How does Aetrix verify that MAX6855UK18D5+T is sourced from the original manufacturer or authorized distributors?
All MAX6855UK18D5+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 MAX6855UK18D5+T meets industry standards.
7.What is the process for return or replacement of MAX6855UK18D5+T?
All MAX6855UK18D5+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6855UK18D5+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 MAX6855UK18D5+T part is unused and in its original packaging.
Return procedure for MAX6855UK18D5+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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