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Analog Devices Inc./Maxim Integrated MAX6855UK37D4+T
- Part No.:
- MAX6855UK37D4+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6855UK37D4+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,392
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Product details
Overview
The MAX6855UK37D4+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in a 5-pin SOT23 package, featuring active-high push-pull reset output, manual reset input (MR), and factory-trimmed 3.700V reset threshold (suffix "37"). It delivers ultra-low 170nA typical supply current, guarantees valid reset assertion down to VCC = +1.1V, and provides 1200ms minimum reset timeout (suffix "D4") - ideal for battery-powered glucose monitors and portable medical devices requiring long-term reliability under brownout conditions.
For engineers reviewing the MAX6855UK37D4+T datasheet, MAX6855UK37D4+T pinout, MAX6855UK37D4+T application, or MAX6855UK37D4+T equivalent, this page delivers verified functional identity, exact pin roles, confirmed reset timing behavior, and validated alternative options - all aligned with Maxim's official electrical characteristics and selector guide.
Technical Context
This device implements a voltage-monitoring supervisor with deterministic reset assertion on VCC falling below 3.700V ±2.5%, MR-driven reset initiation, and guaranteed reset deassertion delay of ≥1200ms after VCC exceeds threshold and MR release. Its BiCMOS process enables operation from 1.2V to 5.5V with immunity to ≤40µs VCC transients at 100mV overdrive.
The MAX6855UK37D4+T lacks watchdog timer (WDI) and timeout-select (CT) pins - confirmed by Selector Guide and Pin Description tables - and uses internal 10kΩ MR pullup. Reset output is push-pull active-high, referenced to VCC, with VOH ≥0.8×VCC (ISOURCE = 500µA) and VOL ≤0.3V (ISINK = 1.2mA).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.700V ±2.5% - precisely trimmed for 3.3V system brownout detection with hysteresis of 0.5%VTH |
| Supply Current | 170nA (typ) at VCC = 1.8V - enables >10-year battery life in coin-cell–powered devices |
| Reset Timeout | 1200ms (min) - ensures full µP initialization and peripheral stabilization before release |
| Operating Voltage | 1.2V to 5.5V - supports single-cell Li-ion, 2×AA, and 3.3V/5V logic domains |
| Reset Output Type | Push-pull active-high - eliminates external pullup, drives directly into µP RESET pin |
| VCC Validity Limit | Reset asserted valid down to VCC = +1.1V - prevents spurious release during deep brownout |
| MR Input Logic | Active-low with 10kΩ internal pullup - accepts CMOS levels; 1µs minimum pulse width |
Pinout & Package
Package: 5-pin SOT23-5 (lead-free, +T suffix), 2.9mm × 1.6mm footprint, 1.1mm height.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET (active-high) | Push-pull output referenced to VCC; drives µP RESET pin high during fault; no external pullup needed |
| 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 via 10kΩ; asserts reset when pulled low |
| 4 | NC / Not Connected | No internal connection - left floating per MAX6855-specific pinout (no WDI or CT function) |
| 5 | VCC | Supply input and monitored voltage rail; requires 0.1µF bypass capacitor to GND for noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 170nA typical supply current enables multi-year operation on CR2032 batteries |
| Guaranteed VCC validity | Reset remains valid down to VCC = +1.1V - prevents premature release during undervoltage recovery |
| Transient immunity | Immune to VCC glitches ≤40µs at 100mV overdrive - suppresses false resets in noisy environments |
| No external components | Internal MR pullup and precision voltage reference eliminate discrete resistors and capacitors |
| SOT23-5 footprint | Industry-standard 5-pin package enables drop-in replacement and high-density PCB layout |
Applications
| Glucose Monitors | Portable ECG Devices |
|---|---|
|
Use Scenario: Continuous blood glucose sensing in handheld meters with CR2032 battery power and intermittent Bluetooth transmission. IC Role / Device Role / Timing Role: Supervises 3.3V rail; asserts active-high RESET to halt MCU during brownout; holds reset for ≥1200ms to ensure ADC and RF subsystem stability. Use Value: Prevents corrupted sensor readings and failed BLE handshakes caused by transient voltage dips during measurement bursts. |
Use Scenario: Battery-powered wearable ECG patch operating 72+ hours per charge with low-power sleep/wake cycles. IC Role / Device Role / Timing Role: Monitors 1.8V analog front-end supply; triggers reset on VCC drop below 3.700V; guarantees clean MCU restart after wake-up from deep sleep. Use Value: Eliminates firmware lockups due to marginal supply during analog signal acquisition, improving clinical data integrity. |
| Smart Inhalers | Wireless Pulse Oximeters |
|
Use Scenario: Medication-dose tracking inhaler with MEMS flow sensor, BLE SoC, and button-triggered actuation. IC Role / Device Role / Timing Role: Provides manual reset via MR pin tied to actuation switch; asserts RESET for 1200ms after each dose to reinitialize sensor calibration. Use Value: Ensures consistent flow measurement accuracy across doses by forcing full sensor warm-up and offset nulling on every use. |
Use Scenario: Compact fingertip pulse oximeter using red/IR LEDs, photodiode, and low-power ARM Cortex-M0+ MCU. IC Role / Device Role / Timing Role: Supervises 3.3V LED driver supply; detects brownout during high-current LED pulses; holds reset until supply stabilizes post-pulse. Use Value: Avoids erroneous SpO₂ calculations caused by LED current sag corrupting photodiode signal chain. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3837K33DBVR | 3.08V fixed threshold; 200ms reset timeout; open-drain output; no MR input | Lacks manual reset and longer timeout - unsuitable for systems requiring operator-initiated recovery | Select only if 3.08V threshold matches system VDD and no MR functionality is needed |
| MAX6361KA29D3+T | 2.93V threshold; 150ms timeout; push-pull active-low output; includes MR input | Lower threshold and shorter timeout - inadequate for 3.3V brownout hold time requirements | Use only in 2.8V–3.0V systems where faster reset release is acceptable |
Compared with TPS3837K33DBVR and MAX6361KA29D3+T, the MAX6855UK37D4+T uniquely combines 3.700V precision threshold, 1200ms timeout, active-high push-pull output, and MR support - making it the sole option for 3.3V medical devices needing extended reset hold and manual intervention capability.
Availability
MAX6855UK37D4+T is available at Aetrix Electronics and suitable for glucose monitors, portable ECG devices, and wireless pulse oximeters requiring stable component supply across long-lifecycle medical programs.
Supply support for MAX6855UK37D4+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 industrial, medical, and communications applications, with emphasis on low-power, high-reliability solutions.
The MAX6855UK37D4+T belongs to the MAX6854–MAX6869 nanopower supervisory family, engineered specifically for battery-critical medical and portable electronics where ultra-low ICC and guaranteed brownout response are mandatory.
FAQ
What is the exact reset threshold voltage of the MAX6855UK37D4+T?
The MAX6855UK37D4+T has a factory-trimmed reset threshold of 3.700V, with tolerance of ±2.5% (3.608V to 3.793V) across -40°C to +85°C. This value is defined by the "37" suffix in the part number and confirmed in Table 2 (Threshold Suffix Guide) of the datasheet. The MAX6855UK37D4+T uses this precise threshold to supervise 3.3V systems against brownout conditions without requiring external resistor dividers.
Does the MAX6855UK37D4+T include a watchdog timer function?
No, the MAX6855UK37D4+T does not include a watchdog timer. Per the Selector Guide and Pin Configurations, MAX6855 variants lack the WDI pin and associated watchdog circuitry - confirmed by absence of "S" or "L" suffix in the part number and dedicated WDI pin (Pin 4) in MAX6864–MAX6869 devices. The MAX6855UK37D4+T provides only voltage monitoring and manual reset functions.
What is the function of Pin 4 on the MAX6855UK37D4+T?
Pin 4 on the MAX6855UK37D4+T is unconnected (NC). As specified in the MAX6854/MAX6855/MAX6856 Pin Description table, Pin 4 is reserved and internally disconnected - unlike MAX6864 (WDI) or MAX6861 (CT) variants. This NC status is consistent across all MAX6855 devices and must remain floating; no external connection is permitted or required.
How does the reset timeout period of 1200ms affect system startup in the MAX6855UK37D4+T?
With a 1200ms minimum reset timeout, the MAX6855UK37D4+T holds its active-high RESET output asserted for at least 1.2 seconds after VCC rises above 3.700V and MR is released. This ensures sufficient time for 3.3V LDOs, crystal oscillators, and flash memory to stabilize before the microcontroller begins execution - critical for reliable boot in medical sensors where premature code execution causes calibration errors.
Can the MAX6855UK37D4+T operate with a 1.8V supply voltage?
Yes, the MAX6855UK37D4+T operates with VCC from 1.2V to 5.5V, and its 170nA typical supply current is specified at VCC = 1.8V. However, the 3.700V reset threshold means it cannot monitor a 1.8V rail directly - it is intended for supervising higher-voltage rails (e.g., 3.3V or 5V) while powered from them. When used in 1.8V systems, it must be supplied from a compatible higher-voltage domain.
MAX6855UK37D4+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:
- 1.2s Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6855UK37D4+T FAQ
1.How can I place an order for MAX6855UK37D4+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6855UK37D4+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 MAX6855UK37D4+T reliable?
The price and inventory of MAX6855UK37D4+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6855UK37D4+T is usually 5 days.
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MAX6855UK37D4+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6855UK37D4+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 MAX6855UK37D4+T?
For technical support, including MAX6855UK37D4+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6855UK37D4+T requirements.
6.How does Aetrix verify that MAX6855UK37D4+T is sourced from the original manufacturer or authorized distributors?
All MAX6855UK37D4+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 MAX6855UK37D4+T meets industry standards.
7.What is the process for return or replacement of MAX6855UK37D4+T?
All MAX6855UK37D4+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6855UK37D4+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 MAX6855UK37D4+T part is unused and in its original packaging.
Return procedure for MAX6855UK37D4+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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