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Analog Devices Inc./Maxim Integrated MAX6855UK43D3+T
- Part No.:
- MAX6855UK43D3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6855UK43D3+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,088
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Product details
Overview
MAX6855UK43D3+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in 5-pin SOT23 package, providing active-high push-pull reset output, manual reset input (MR), and factory-trimmed 4.300V reset threshold with 150ms minimum reset timeout. It monitors VCC supply integrity for brownout detection and asserts reset during power-up, power-down, or voltage sag - used in battery-powered medical and portable electronics requiring ultra-low quiescent current.
For engineers reviewing the MAX6855UK43D3+T datasheet, MAX6855UK43D3+T pinout, MAX6855UK43D3+T application, or MAX6855UK43D3+T equivalent, key selection criteria include its 170nA typical supply current at 2.5V, guaranteed reset validity down to VCC = +1.1V, immunity to sub-40µs VCC transients, and compatibility with CMOS-level MR signaling without external pullup.
Technical Context
The MAX6855UK43D3+T implements a precision bandgap-based voltage monitor with ±2.5% threshold accuracy over -40°C to +85°C, coupled to a monolithic timer generating fixed 150ms (min) reset assertion after VCC recovery or MR release. Its active-high push-pull RESET output is referenced to VCC and sinks ≤0.3V at 1.2mA load.
No watchdog timer or CT pin is present - this variant belongs to the MAX6854/MAX6855/MAX6856 family subset with manual reset only and fixed timeout. The MR input features 10kΩ internal pullup, 1µs minimum pulse width support, and 200ns glitch rejection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.300V (factory-trimmed, ±2.5% tolerance) - sets precise brownout detection point for 4.5V nominal systems |
| Supply Current | 170nA typical at 2.5V - enables multi-year operation on coin-cell batteries in always-on monitoring |
| Reset Timeout | 150ms minimum - ensures µP completes power-rail stabilization before release from reset |
| Operating Voltage | 1.2V to 5.5V - supports wide-input battery systems including single Li-ion and dual alkaline |
| Reset Validity | Guaranteed to VCC = +1.1V - maintains deterministic reset state during deep brownout |
| MR Input Logic | Active-low, internally pulled up to VCC via 10kΩ - eliminates need for external resistor in most designs |
| Output Type | Push-pull active-high RESET - drives high without external components; compatible with µP reset inputs requiring logic-high assertion |
Pinout & Package
Package: 5-pin SOT23 (lead-free, +T suffix), footprint-compatible with industry-standard 5-lead SOT-23 packages.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-high push-pull reset output - drives high when asserted; referenced to VCC; no external pullup required |
| 2 | GND | Ground reference - must be connected to system ground plane for accurate threshold sensing |
| 3 | MR | Active-low manual reset input - initiates reset when pulled low; internally pulled up to VCC (10kΩ) |
| 4 | GND | Second ground terminal - electrically tied to Pin 2 internally; improves noise immunity in noisy layouts |
| 5 | VCC | Supply voltage input - monitored for reset generation; requires 0.1µF bypass capacitor to GND per datasheet |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 170nA typical supply current - extends battery life in portable glucose monitors and wearables |
| VCC transient immunity | Immune to VCC glitches ≤40µs at 100mV overdrive - prevents spurious resets in electrically noisy environments |
| No external components | Self-contained supervision - eliminates discrete R/C networks, reducing BOM count and PCB area |
| Guaranteed reset at low VCC | Valid RESET output down to VCC = +1.1V - ensures reliable reset assertion even during severe brownout |
| CMOS-compatible MR | MR accepts standard CMOS logic levels and open-drain signals - simplifies interface with FPGAs and microcontrollers |
Applications
| Glucose Monitors | Patient Vital Sign Loggers |
|---|---|
Use Scenario: Continuous blood glucose measurement in handheld or wearable devices powered by CR2032 coin cell. IC Role / Device Role / Timing Role: Supervises 3.3V rail and provides clean reset to low-power MCU upon battery insertion or voltage sag. Use Value: 170nA ICC enables >5-year shelf life; 150ms timeout ensures ADC and sensor initialization completes before firmware execution. |
Use Scenario: Portable ECG/SpO₂ recorder operating from two AA alkaline cells with variable discharge profile. IC Role / Device Role / Timing Role: Monitors declining 3.0V–1.8V supply and asserts reset before data corruption occurs during brownout. Use Value: 4.300V threshold matches system's safe operating window; 1.1V reset validity guarantees deterministic behavior near end-of-life. |
| Smart Pagers | Industrial Handheld Terminals |
Use Scenario: Two-way messaging device with intermittent RF transmission causing supply ripple on 3.6V Li-ion rail. IC Role / Device Role / Timing Role: Detects short VCC dips below 4.3V and holds MCU in reset until stable, using MR for user-initiated reboot. Use Value: 40µs transient immunity prevents false resets during RF burst; MR internal pullup reduces component count. |
Use Scenario: Ruggedized barcode scanner with cold-temperature operation (-20°C) and mechanical reset button. IC Role / Device Role / Timing Role: Provides fail-safe reset during battery swap and validates power integrity before booting ARM Cortex-M4. Use Value: -40°C to +85°C rating ensures reliability in warehouse environments; push-pull active-high RESET directly interfaces with processor reset pin. |
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 reset threshold; 200ms timeout; 1.8µA ICC (vs. 170nA) | Higher supply current limits use in ultra-low-power coin-cell designs | Select when 3.3V rail supervision is required and higher ICC is acceptable |
| MAX6315US33D3+ | 3.3V threshold; 150ms timeout; 1.6µA ICC; SOT23-5 package | Not specified for VCC < 1.2V; lacks 1.1V reset validity guarantee | Choose for cost-sensitive 3.3V systems where extended low-VCC operation is not needed |
Compared with TPS3837K33DBVR and MAX6315US33D3+, the MAX6855UK43D3+T delivers 10× lower supply current and guaranteed reset functionality down to 1.1V - critical for long-life medical and portable equipment where battery voltage decays below 1.2V.
Availability
MAX6855UK43D3+T is available at Aetrix Electronics and suitable for portable medical devices, battery-powered instrumentation, and industrial handheld terminals requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6855UK43D3+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 management, sensing, and interface applications in industrial, medical, and communications markets.
The MAX6855UK43D3+T belongs to the nanopower µP supervisory family engineered specifically for ultra-low-current battery-powered systems where reset accuracy, supply robustness, and minimal quiescent power are mandatory design requirements.
FAQ
What is the exact reset threshold voltage of the MAX6855UK43D3+T?
The MAX6855UK43D3+T has a factory-trimmed reset threshold of 4.300V, 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 "43" corresponds to 4.300V nominal. The MAX6855UK43D3+T uses this precise threshold to protect 4.5V nominal systems against brownout while avoiding premature reset during normal regulation ripple.
Does the MAX6855UK43D3+T include a watchdog timer function?
No, the MAX6855UK43D3+T does not include a watchdog timer. It belongs to the MAX6854/MAX6855/MAX6856 subgroup that provides only voltage monitoring and manual reset (MR) functionality. Watchdog capability is exclusive to MAX6864–MAX6869 variants, identifiable by "S" or "L" suffixes in the ordering code. The MAX6855UK43D3+T pinout omits WDI, confirming absence of watchdog circuitry.
What is the reset timeout period for the MAX6855UK43D3+T?
The MAX6855UK43D3+T has a fixed minimum reset timeout period of 150ms, indicated by the "D3" suffix in its part number. Per Table 4 (Reset Timeout Periods), D3 corresponds to 150ms (min) / 225ms (typ) / 300ms (max). This timeout begins after VCC rises above the 4.300V threshold or MR is released, ensuring sufficient time for power rails and peripherals to stabilize before releasing the microprocessor from reset.
Is the RESET output of the MAX6855UK43D3+T push-pull or open-drain?
The MAX6855UK43D3+T features an active-high push-pull RESET output, as confirmed by the Selector Guide and Pin Description table. Unlike open-drain variants, it drives high actively without requiring an external pullup resistor. This configuration directly interfaces with microprocessors expecting logic-high reset assertion and simplifies layout by eliminating external components - a key advantage of the MAX6855UK43D3+T over open-drain alternatives.
Can the MAX6855UK43D3+T operate reliably at VCC = 1.1V?
Yes, the MAX6855UK43D3+T guarantees valid RESET output down to VCC = +1.1V, as explicitly stated in the Features list and Electrical Characteristics table. This specification ensures deterministic reset behavior during deep brownout conditions common in aging primary batteries. Below 1.1V, reset functionality is not guaranteed - but the MAX6855UK43D3+T's 1.2V minimum operating voltage aligns precisely with this validated operational floor.
MAX6855UK43D3+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:
- 4.3V
- 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
MAX6855UK43D3+T FAQ
1.How can I place an order for MAX6855UK43D3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6855UK43D3+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 MAX6855UK43D3+T reliable?
The price and inventory of MAX6855UK43D3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6855UK43D3+T is usually 5 days.
3.What payment methods are accepted for MAX6855UK43D3+T?
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4.How is shipping managed for MAX6855UK43D3+T?
MAX6855UK43D3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6855UK43D3+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 MAX6855UK43D3+T?
For technical support, including MAX6855UK43D3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6855UK43D3+T requirements.
6.How does Aetrix verify that MAX6855UK43D3+T is sourced from the original manufacturer or authorized distributors?
All MAX6855UK43D3+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 MAX6855UK43D3+T meets industry standards.
7.What is the process for return or replacement of MAX6855UK43D3+T?
All MAX6855UK43D3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6855UK43D3+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 MAX6855UK43D3+T part is unused and in its original packaging.
Return procedure for MAX6855UK43D3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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