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Analog Devices Inc./Maxim Integrated MAX6855UK34D1+T
- Part No.:
- MAX6855UK34D1+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6855UK34D1+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,527
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Product details
Overview
The MAX6855UK34D1+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in a 5-pin SOT23 package, featuring active-high push-pull reset output, 3.4V factory-trimmed reset threshold (±2.5%), 10ms minimum reset timeout, manual reset input (MR), and guaranteed reset validity down to VCC = +1.1V. It monitors supply voltage integrity and asserts reset during power-up, brownout, or manual trigger events in ultra-low-power portable systems.
For engineers reviewing the MAX6855UK34D1+T datasheet, MAX6855UK34D1+T pinout, MAX6855UK34D1+T application, or MAX6855UK34D1+T equivalent, this device serves as a precision, low-current (170nA typ) reset supervisor for battery-powered medical and consumer electronics where supply stability, timing predictability, and minimal quiescent current are critical selection criteria.
Technical Context
The MAX6855UK34D1+T implements a voltage-monitoring comparator with hysteresis (0.5% of VTH), a fixed 10ms reset timeout timer, and an internally pulled-up MR input (10kΩ). Its active-high push-pull RESET output drives high when VCC falls below 3.4V or MR is asserted, remaining high for ≥10ms after VCC exceeds threshold and MR deasserts.
No watchdog timer or CT select functionality is present - this variant belongs to the MAX6855 subfamily, which excludes WDI and CT pins and provides only push-pull active-high reset output. It operates across -40°C to +85°C and supports supply voltages from 1.2V to 5.5V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold Voltage | 3.4V ±2.5% - precisely trimmed at factory; ensures reliable detection of 3.3V rail brownout before µP malfunction. |
| Supply Current (ICC) | 170nA typical at VCC = 1.8V - enables multi-year battery life in glucose monitors and pagers. |
| Reset Timeout Period | 10ms minimum - guarantees sufficient hold time for µP initialization without over-delaying system boot. |
| RESET Output Type | Push-pull active-high - eliminates need for external pullup; directly interfaces with µP's active-high reset input. |
| VCC Validity Range | Reset asserted valid down to VCC = +1.1V - maintains supervision capability deeper into discharge than most competitors. |
| MR Input Behavior | Active-low, internally pulled up to VCC (10kΩ) - accepts CMOS logic or momentary switch; no external components required. |
| Operating Temperature | -40°C to +85°C - qualified for industrial and portable medical environments including patient monitors. |
Pinout & Package
Package: 5-pin SOT23-5, lead-free, surface-mount. Compact footprint (2.9mm × 1.6mm × 1.1mm) suitable for space-constrained portable PCBs.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-high push-pull reset output - drives high during fault; sinks current when deasserted; no external pullup needed. |
| 2 | GND | Ground reference - must be connected to system ground plane; shared return for all internal functions. |
| 3 | MR | Active-low manual reset input - internally pulled up to VCC (10kΩ); assert low ≥1µs to trigger reset. |
| 4 | GND | Second ground terminal - electrically tied to Pin 2 internally; improves noise immunity in noisy layouts. |
| 5 | VCC | Supply voltage input - monitored rail; bypass with 0.1µF ceramic capacitor to GND for transient suppression. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low 170nA supply current | Extends battery life in single-cell Li-ion or coin-cell applications beyond 5 years under typical duty cycles. |
| Guaranteed reset validity to VCC = +1.1V | Ensures supervision remains functional deep into battery discharge, preventing undefined µP states. |
| Immunity to short VCC transients | Rejects ≤40µs glitches at 100mV overdrive - avoids spurious resets in electrically noisy handheld devices. |
| No external components required | Integrates MR pullup, reset timer, and voltage reference - reduces BOM count and layout area vs. discrete solutions. |
| Factory-trimmed 3.4V reset threshold | Eliminates calibration overhead and ensures ±2.5% accuracy across temperature without trimming resistors. |
Applications
| Glucose Monitors | Portable ECG Devices |
|---|---|
|
Use Scenario: Continuous blood glucose sensing with Bluetooth LE transmission in disposable wearable patches. IC Role / Device Role / Timing Role: Supervises 3.3V LDO output powering ADC, BLE SoC, and sensor interface; asserts active-high reset on brownout. Use Value: 170nA ICC extends single CR2032 battery life to >24 months; 10ms timeout aligns with BLE SoC wake-up latency. |
Use Scenario: Battery-powered handheld ECG recorder with real-time waveform display and SD card logging. IC Role / Device Role / Timing Role: Monitors main 3.3V rail feeding analog front-end and ARM Cortex-M4 MCU; triggers reset on voltage sag during flash write. Use Value: 3.4V threshold matches nominal 3.3V rail tolerance; push-pull active-high output directly drives MCU's nRST pin without level-shifting. |
| Smart Pagers | Industrial Handheld Terminals |
|
Use Scenario: Two-way messaging pager with OLED display and vibration motor, operating on AA alkaline cells. IC Role / Device Role / Timing Role: Provides power-on reset and brownout protection for RF transceiver and display controller; MR pin enables user-initiated reboot. Use Value: MR internal 10kΩ pullup simplifies button interface; 1.1V VCC validity ensures reset assertion even as batteries deplete to 1.2V per cell. |
Use Scenario: Ruggedized barcode scanner used in warehouse logistics with frequent drop-induced power interruptions. IC Role / Device Role / Timing Role: Supervises 3.3V supply derived from buck converter; detects rapid VCC collapse during mechanical shock-induced decoupling loss. Use Value: 40µs transient immunity prevents false resets from vibration-induced supply bounce; SOT23-5 withstands reflow and mechanical stress. |
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 reset threshold (±0.5%), 200nA ICC, open-drain active-low output, no MR input | Requires external pullup and level-shifting for active-high µP inputs; less suitable for direct replacement in MR-enabled designs | Select if open-drain flexibility and tighter threshold tolerance outweigh need for MR and active-high output |
| MAX6315US34D3+T | 3.4V threshold, 1.6µA ICC (10× higher), push-pull active-low output, 200ms timeout, same SOT23-5 package | Higher current draw limits battery life; active-low output requires inverter or µP compatibility check; longer timeout may delay recovery | Choose only if legacy design uses active-low reset and can accommodate higher ICC and slower response |
Compared with TPS3837K33DBVR and MAX6315US34D3+T, the MAX6855UK34D1+T uniquely combines ultra-low ICC, factory-trimmed 3.4V threshold, active-high push-pull output, and integrated MR - making it optimal for new energy-sensitive designs requiring direct µP reset compatibility and long service intervals.
Availability
MAX6855UK34D1+T is available at Aetrix Electronics and suitable for glucose monitors, portable ECG devices, and smart pagers requiring stable component supply with guaranteed long-term availability and lead-free compliance.
Supply support for MAX6855UK34D1+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 demanding industrial and medical applications.
The MAX685x family delivers nanopower supervisory circuits optimized for battery longevity and reliability in portable healthcare and consumer electronics - emphasizing sub-µA operation, wide VCC range, and robust reset timing.
FAQ
What is the exact reset threshold voltage of the MAX6855UK34D1+T?
The MAX6855UK34D1+T has a factory-trimmed reset threshold of 3.4V 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 "34" corresponds to 3.4V nominal. The device asserts reset when VCC falls below this threshold and holds reset for ≥10ms after VCC rises above it.
Does the MAX6855UK34D1+T include a watchdog timer function?
No, the MAX6855UK34D1+T does not include a watchdog timer. It belongs to the MAX6855 subfamily, which provides only voltage monitoring, manual reset (MR), and fixed reset timeout - no WDI pin or watchdog circuitry. Watchdog capability is exclusive to MAX6864–MAX6869 variants, identifiable by "S" or "L" suffixes in the ordering code.
What is the function of Pin 1 and Pin 4 on the MAX6855UK34D1+T?
On the MAX6855UK34D1+T, Pin 1 is the active-high push-pull RESET output, and Pin 4 is a dedicated GND terminal (electrically tied to Pin 2). This dual-GND configuration enhances noise immunity in compact portable PCB layouts. Neither pin is I.C. or CT - those functions appear only on other variants like MAX6858 or MAX6861.
Can the MAX6855UK34D1+T operate with a 1.8V supply?
Yes, the MAX6855UK34D1+T operates with VCC as low as 1.2V and guarantees valid reset assertion down to VCC = +1.1V. At 1.8V, its typical supply current is 170nA, and VOH meets 0.8 × VCC with 200µA source current - fully compatible with 1.8V logic systems and low-voltage µPs.
Is the MAX6855UK34D1+T pin-compatible with the TPS3837 series?
No, the MAX6855UK34D1+T is not pin-compatible with the TPS3837 series. While both are 5-pin SOT23 supervisors, the MAX6855UK34D1+T uses Pins 1/2/3/4/5 as RESET/GND/MR/GND/VCC, whereas TPS3837 devices assign Pin 1 as GND and Pin 3 as RESET. Direct substitution would require PCB redesign due to differing pinouts and active-high vs. open-drain output types.
MAX6855UK34D1+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:
- 3.4V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 10ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6855UK34D1+T FAQ
1.How can I place an order for MAX6855UK34D1+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6855UK34D1+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 MAX6855UK34D1+T reliable?
The price and inventory of MAX6855UK34D1+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6855UK34D1+T is usually 5 days.
3.What payment methods are accepted for MAX6855UK34D1+T?
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4.How is shipping managed for MAX6855UK34D1+T?
MAX6855UK34D1+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6855UK34D1+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 MAX6855UK34D1+T?
For technical support, including MAX6855UK34D1+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6855UK34D1+T requirements.
6.How does Aetrix verify that MAX6855UK34D1+T is sourced from the original manufacturer or authorized distributors?
All MAX6855UK34D1+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 MAX6855UK34D1+T meets industry standards.
7.What is the process for return or replacement of MAX6855UK34D1+T?
All MAX6855UK34D1+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6855UK34D1+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 MAX6855UK34D1+T part is unused and in its original packaging.
Return procedure for MAX6855UK34D1+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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