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Analog Devices Inc./Maxim Integrated MAX6855UK42D5+T
- Part No.:
- MAX6855UK42D5+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6855UK42D5+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,085
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Product details
Overview
The MAX6855UK42D5+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in a 5-pin SOT23 package, providing voltage monitoring, manual reset input (MR), and active-low push-pull reset output. It asserts reset when VCC drops below 4.200V (typ), MR is pulled low, or - per family capability - watchdog timer expires (though MAX6855 lacks WDI). Designed for ultra-low-power systems, it draws only 170nA (typ) at 2.5V and guarantees valid reset down to VCC = +1.1V.
For engineers reviewing the MAX6855UK42D5+T datasheet, MAX6855UK42D5+T pinout, MAX6855UK42D5+T application, or MAX6855UK42D5+T equivalent, this device serves as a precision, low-current reset supervisor for battery-powered medical and portable electronics where supply stability, timing predictability, and minimal quiescent current are critical selection criteria.
Technical Context
The MAX6855UK42D5+T implements a factory-trimmed reset threshold of +4.200V (±2.5%), with hysteresis of 0.5% VTH, and a fixed minimum reset timeout period of 300ms (D5 option). Its push-pull active-high RESET output is referenced to VCC and sinks ≤0.3V at 1.2mA load while sourcing ≥0.8×VCC at 500µA.
It features an internally pulled-up MR input (10kΩ to VCC), immune to <200ns glitches, with MR-to-reset delay of 250ns (max). Supply current remains stable across -40°C to +85°C, varying only from 170nA (typ) at +25°C to ~220nA (typ) at +85°C under VCC = 1.8V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | +4.200V (typ), ±2.5% tolerance - ensures reliable brownout detection at nominal 4.2V Li-ion battery full-charge level |
| Reset Timeout Period | 300ms (min), 450ms (typ), 600ms (max) - provides sufficient hold time for µP power-up sequencing after VCC recovery |
| Supply Current | 170nA (typ) at VCC = 2.5V, TA = +25°C - enables multi-year operation on coin-cell batteries in always-on devices |
| RESET Output Type | Push-pull active-high - eliminates need for external pullup and ensures clean, rail-to-rail logic-level assertion without leakage concerns |
| VCC Validity Range | Reset guaranteed valid down to VCC = +1.1V - supports robust reset assertion during deep brownout conditions before µP loses functionality |
| MR Input Behavior | Internally pulled up to VCC via 10kΩ; accepts CMOS logic levels; 1µs minimum pulse width - simplifies manual reset implementation with momentary switches |
| Operating Temperature | -40°C to +85°C - qualified for industrial and portable medical environments including patient monitors and glucose meters |
Pinout & Package
Package: 5-pin SOT23-5, surface-mount, lead-free (RoHS-compliant).
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-high push-pull reset output - drives high upon reset assertion; no external pullup required; compatible with µP reset inputs expecting active-high logic |
| 2 | GND | Ground reference - must be connected to system ground plane; shared return for all internal circuits |
| 3 | MR | Active-low manual reset input - pulling low initiates reset; internally pulled up to VCC (10kΩ); tolerant of noisy switch interfaces |
| 4 | GND | Second ground terminal - improves noise immunity and thermal dissipation; must be tied to same ground potential as Pin 2 |
| 5 | VCC | Supply voltage input - monitors system VCC for reset generation; requires 0.1µF bypass capacitor to GND for noise rejection |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low supply current | 170nA typical - extends battery life in portable medical devices such as glucose monitors operating continuously for >5 years on CR2032 |
| Factory-trimmed reset threshold | +4.200V (±2.5%) - precisely matches 4.2V Li-ion battery full-charge cutoff, eliminating external resistor networks |
| Guaranteed reset validity | Down to VCC = +1.1V - ensures deterministic reset behavior even during severe brownout, preventing µP lockup |
| Immunity to short VCC transients | No reset triggered by ≤40µs transients at 100mV overdrive - rejects switching noise from DC-DC converters without false triggers |
| No external components required | Self-contained supervision - reduces BOM count, PCB area, and qualification effort in space-constrained wearables |
Applications
| Glucose Monitoring Systems | Patient Vital Sign Monitors |
|---|---|
|
Use Scenario: Continuous glucose sensing patch with Bluetooth LE transmission and coin-cell power. IC Role / Device Role / Timing Role: Supervises 3.3V regulated rail derived from CR2032; asserts active-high RESET to ARM Cortex-M0 during battery voltage sag. Use Value: 170nA quiescent current preserves battery capacity; 300ms timeout ensures reliable µP initialization after low-VCC recovery. |
Use Scenario: Portable ECG/SpO₂ monitor powered by rechargeable Li-ion with 4.2V termination. IC Role / Device Role / Timing Role: Monitors main 4.2V supply rail; triggers reset if voltage falls below 4.200V due to sudden load surge or aging cell. Use Value: Factory-trimmed 4.200V threshold eliminates calibration; push-pull RESET avoids pullup resistor in high-reliability medical signal chain. |
| Wireless Hearing Aids | Smart Wearable Sensors |
|
Use Scenario: Miniaturized hearing aid using 1.2V LDO output from 3.7V Li-ion cell. IC Role / Device Role / Timing Role: Supervises 1.2V LDO output; asserts RESET when VCC dips below 1.2V - enabled by guaranteed operation down to VCC = +1.1V. Use Value: Valid reset assertion at ultra-low VCC prevents firmware corruption during final battery discharge phase. |
Use Scenario: BLE-enabled environmental sensor node with intermittent wake-up and long sleep cycles. IC Role / Device Role / Timing Role: Provides manual reset via MCU GPIO for field firmware recovery; integrates cleanly with low-power sleep states. Use Value: MR input's 10kΩ internal pullup and 1µs pulse requirement simplify host-side reset control without additional passives. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3837K33DBVR | Fixed 3.3V reset threshold; 200ms timeout; 1.6µA ICC (typ) - 9× higher supply current than MAX6855UK42D5+T | Targeted at 3.3V systems; not suitable for 4.2V battery monitoring without external divider | Select only if 3.3V rail supervision is required and nanopower is not critical |
| MAX6316LUK42D3+T | Same 4.2V threshold and SOT23-5 package; but open-drain active-low RESET and 1.2µA ICC (typ) | Lacks push-pull active-high output; requires external pullup; higher current limits battery lifetime in always-on designs | Choose only if legacy board uses open-drain interface or active-low reset logic |
Compared with TPS3837K33DBVR and MAX6316LUK42D3+T, the MAX6855UK42D5+T uniquely delivers 4.2V precision supervision with active-high push-pull output and nanopower consumption - making it optimal for next-generation 4.2V Li-ion–powered medical wearables requiring multi-year battery life and simplified layout.
Availability
MAX6855UK42D5+T is available at Aetrix Electronics and suitable for glucose monitoring systems, patient vital sign monitors, and wireless hearing aids requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX6855UK42D5+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 MAX6855UK42D5+T belongs to the MAX68xx nanopower µP supervisory family, designed specifically for battery-critical portable medical and consumer electronics where ultra-low ICC, precise voltage thresholds, and guaranteed reset validity at low VCC are essential.
FAQ
What is the exact reset threshold voltage of the MAX6855UK42D5+T?
The MAX6855UK42D5+T has a factory-trimmed reset threshold of +4.200V (typical), with a guaranteed range of +4.095V to +4.305V (±2.5%) across -40°C to +85°C. This value is encoded in the "42" suffix per Maxim's Threshold Suffix Guide and is laser-trimmed during production - no external adjustment is needed. The MAX6855UK42D5+T maintains this accuracy without drift over temperature or time.
Does the MAX6855UK42D5+T include a watchdog timer function?
No, the MAX6855UK42D5+T does not include a watchdog timer. It is part of the MAX6854/MAX6855/MAX6856 series, which provide voltage monitoring and manual reset only. Watchdog functionality is available only in MAX6864–MAX6869 variants (e.g., MAX6864UK42D5S+T). The MAX6855UK42D5+T pinout and functional block diagram confirm absence of WDI pin and watchdog circuitry.
What is the reset timeout period for the MAX6855UK42D5+T?
MAX6855UK42D5+T uses the "D5" suffix, corresponding to a minimum reset timeout period of 300ms, typical of 450ms, and maximum of 600ms. This timeout begins after VCC rises above the reset threshold and MR is deasserted, ensuring the microprocessor receives a sufficiently long reset pulse for reliable initialization - critical in systems with slow-ramping power supplies.
Is the MAX6855UK42D5+T pin-compatible with other MAX68xx devices?
The MAX6855UK42D5+T shares the same 5-pin SOT23-5 footprint and pinout (RESET, GND, MR, GND, VCC) with MAX6854 and MAX6856 variants, but differs in RESET polarity: MAX6855UK42D5+T outputs active-high push-pull, whereas MAX6854 is active-low push-pull and MAX6856 is active-low open-drain. Direct substitution requires verification of host µP reset input logic polarity and drive requirements.
What is the maximum operating supply voltage for the MAX6855UK42D5+T?
The MAX6855UK42D5+T operates over a supply voltage range of +1.2V to +5.5V, with absolute maximum rating of +6.0V on VCC. Electrical characteristics are fully specified from +1.2V to +5.5V across -40°C to +85°C. Operation at 5.5V is supported, but the reset threshold remains fixed at +4.200V - ensuring reliable detection even when VCC exceeds threshold during transient overvoltage events.
MAX6855UK42D5+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:
- 4.2V
- 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
MAX6855UK42D5+T FAQ
1.How can I place an order for MAX6855UK42D5+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6855UK42D5+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 MAX6855UK42D5+T reliable?
The price and inventory of MAX6855UK42D5+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6855UK42D5+T is usually 5 days.
3.What payment methods are accepted for MAX6855UK42D5+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6855UK42D5+T transactions.
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4.How is shipping managed for MAX6855UK42D5+T?
MAX6855UK42D5+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6855UK42D5+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 MAX6855UK42D5+T?
For technical support, including MAX6855UK42D5+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6855UK42D5+T requirements.
6.How does Aetrix verify that MAX6855UK42D5+T is sourced from the original manufacturer or authorized distributors?
All MAX6855UK42D5+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 MAX6855UK42D5+T meets industry standards.
7.What is the process for return or replacement of MAX6855UK42D5+T?
All MAX6855UK42D5+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6855UK42D5+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 MAX6855UK42D5+T part is unused and in its original packaging.
Return procedure for MAX6855UK42D5+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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