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Analog Devices Inc./Maxim Integrated MAX6855UK45D6+T
- Part No.:
- MAX6855UK45D6+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6855UK45D6+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,588
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Product details
Overview
MAX6855UK45D6+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in 5-pin SOT23 package, featuring active-high push-pull reset output, 4.500V factory-trimmed reset threshold (±2.5%), 1200ms minimum reset timeout, manual reset input (MR), and guaranteed reset validity down to VCC = +1.1V. It monitors supply voltage in battery-powered portable electronics to prevent code-execution errors during power-up, brownout, or reset events.
For engineers reviewing the MAX6855UK45D6+T datasheet, MAX6855UK45D6+T pinout, MAX6855UK45D6+T application, or MAX6855UK45D6+T equivalent, this page delivers verified electrical parameters, exact pin functions, real-world use cases in medical and handheld devices, and two confirmed alternative parts with documented functional and timing differences.
Technical Context
The MAX6855UK45D6+T implements a precision voltage monitor with hysteresis (0.5% of VTH) and a fixed 1200ms reset timeout timer. Its MR input features internal 10kΩ pullup, 1µs minimum pulse width, and 200ns glitch rejection - enabling robust manual reset initiation without external components.
Unlike watchdog-equipped variants (e.g., MAX6864–MAX6869), the MAX6855UK45D6+T omits WDI functionality and CT select input, simplifying design for applications requiring only voltage monitoring and manual reset. Its push-pull active-high RESET output drives directly to VCC with VOH ≥ 0.8×VCC at ISOURCE = 500µA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.500V ±2.5% - precisely matches 4.5V rail monitoring; ensures reliable assertion before microprocessor brownout. |
| Reset Timeout | 600ms–1200ms (min) - long enough to hold reset until full system stabilization after power recovery. |
| Supply Current | 170nA typical at VCC = 1.8V - enables multi-year battery life in glucose monitors and pagers. |
| Reset Output Type | Push-pull active-high - eliminates need for external pullup; interfaces directly with µP reset inputs requiring high-asserted reset. |
| VCC Operating Range | 1.2V to 5.5V - supports operation across Li-ion, alkaline, and regulated 3.3V/5V rails. |
| Reset Validity Limit | Guaranteed to VCC = +1.1V - ensures deterministic reset behavior deeper into undervoltage than most competitors. |
| MR Input Pullup | 10kΩ internal - allows direct switch-to-GND connection without external resistor; reduces BOM count. |
Pinout & Package
Package: 5-pin SOT23-5, lead-free, -40°C to +85°C operating range.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-high push-pull reset output - asserts high when VCC < 4.500V or MR is low; deasserts low after timeout. |
| 2 | GND | Ground reference - must be connected to system ground plane; shared return for all internal circuits. |
| 3 | MR | Active-low manual reset input - internally pulled up to VCC via 10kΩ; 1µs pulse sufficient to trigger reset. |
| 4 | GND | Second ground terminal - electrically tied to Pin 2 internally; improves noise immunity in high-frequency 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 - extends battery life in portable medical devices where duty cycle is dominated by supervision current. |
| No external components | Integrated MR pullup, precision voltage reference, and timeout timer - eliminates discrete resistors/capacitors required by discrete reset solutions. |
| Transient immunity | Immune to VCC glitches ≤40µs at 100mV overdrive - prevents spurious resets in noisy automotive or industrial environments. |
| Valid reset to 1.1V | RESET remains functional down to VCC = 1.1V - ensures safe shutdown sequencing in deep brownout conditions. |
| SOT23-5 footprint | Industry-standard 5-pin package - enables drop-in replacement for TPS3837 and compatible supervisory ICs. |
Applications
| Glucose Monitors | Patient Monitors |
|---|---|
Use Scenario: Continuous blood glucose sensing in wearable patch pumps with coin-cell battery. IC Role / Device Role / Timing Role: Voltage supervisor asserting active-high reset to MCU during battery sag below 4.5V. Use Value: Prevents firmware corruption during low-battery operation while consuming only 170nA - extending usable runtime by >18 months. |
Use Scenario: Portable ECG and SpO₂ units powered by rechargeable Li-ion cells. IC Role / Device Role / Timing Role: Ensures clean MCU reset on power-up and brownout, with 1200ms timeout allowing ADC calibration completion. Use Value: Guarantees deterministic boot sequence even as battery voltage decays from 4.2V to 3.0V, meeting IEC 60601-1 reliability requirements. |
| MP3 Players | PDAs / Smart Handhelds |
Use Scenario: Flash-based audio players using single-cell alkaline supply (1.5V nominal). IC Role / Device Role / Timing Role: Supervises regulated 3.3V rail generated from boost converter; triggers reset if regulator fails. Use Value: 4.500V threshold avoids false resets during transient load spikes; 1200ms timeout accommodates slow-start DC/DC converters. |
Use Scenario: Legacy PDA platforms with ARM7-based SoC and multiple voltage domains. IC Role / Device Role / Timing Role: Provides primary reset signal to CPU and peripheral controllers during cold start and wake-from-sleep. Use Value: Push-pull active-high output directly drives reset pins without level-shifting; eliminates risk of floating reset lines during VCC ramp. |
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, 200ms timeout, open-drain active-low output - requires external pullup and level translation for active-high µP inputs. | Designed for 3.3V systems only; lacks 4.5V threshold option and ultra-low 170nA current. | Select only if system uses 3.3V supply and µP accepts active-low reset; not suitable for 4.5V monitoring or battery-critical designs. |
| MAX6326UR29D3+T | 2.93V threshold, 200ms timeout, push-pull active-low output - same 5-pin SOT23 package but inverted logic polarity and shorter timeout. | Targets lower-voltage microcontrollers; no manual reset input; higher 1.6µA supply current erodes battery life. | Use only when active-low reset is acceptable and 2.93V threshold aligns with system rail; avoid where MR function or 4.5V accuracy is required. |
Compared with TPS3837K33DBVR and MAX6326UR29D3+T, the MAX6855UK45D6+T uniquely combines 4.500V precision threshold, 1200ms timeout, active-high push-pull output, MR input, and 170nA quiescent current - making it the sole fit for 4.5V-supervised, battery-constrained, manually resettable systems.
Availability
MAX6855UK45D6+T is available at Aetrix Electronics and suitable for glucose monitors, patient monitors, MP3 players, and PDAs requiring stable component supply with guaranteed long-term availability and lead-free compliance.
Supply support for MAX6855UK45D6+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 interface applications, with emphasis on low-power, high-reliability solutions.
The MAX6854–MAX6869 family was engineered specifically for nanopower microprocessor supervision in portable medical and consumer electronics - prioritizing ultra-low ICC, precise reset thresholds, and robust noise immunity in compact SOT23 packages.
FAQ
What is the exact reset threshold voltage of MAX6855UK45D6+T?
The MAX6855UK45D6+T has a factory-trimmed reset threshold of +4.500V, with tolerance of ±2.5% over temperature (-40°C to +85°C). This value is confirmed in Table 2 (Threshold Suffix Guide) of the datasheet, where suffix "45" corresponds to 4.500V nominal. The device asserts reset when VCC falls below this threshold and holds reset for the full 1200ms timeout after VCC recovers.
Does MAX6855UK45D6+T include a watchdog timer?
No, the MAX6855UK45D6+T does not include a watchdog timer. Per the Selector Guide and Pin Description sections, only MAX6864–MAX6869 variants feature WDI input and watchdog functionality. The MAX6855UK45D6+T provides voltage monitoring, manual reset (MR), and fixed reset timeout - making it suitable for systems where software-level watchdog supervision is handled externally or not required.
What is the function of Pin 1 on MAX6855UK45D6+T?
Pin 1 of the MAX6855UK45D6+T is the RESET output, configured as an active-high push-pull driver. When VCC drops below 4.500V or MR is asserted low, RESET goes high and remains high for the full 1200ms timeout period after VCC rises above threshold and MR is released. This eliminates need for external pullup resistors and directly interfaces with µP reset inputs expecting high-asserted reset signals.
Can MAX6855UK45D6+T operate with supply voltages below 1.8V?
Yes, the MAX6855UK45D6+T operates from VCC = 1.2V to 5.5V and guarantees valid reset output down to VCC = +1.1V. Electrical Characteristics confirm supply current of 170nA typical at VCC = 1.8V and functionality maintained at 1.2V. However, VOH performance degrades below 1.71V (minimum 0.8×VCC at ISOURCE = 200µA), so system-level validation is recommended for sub-1.5V operation.
Is MAX6855UK45D6+T pin-compatible with other devices in the MAX68xx family?
The MAX6855UK45D6+T shares the same 5-pin SOT23-5 pinout as MAX6854, MAX6856, MAX6861–MAX6863, and MAX6864–MAX6869 variants - with Pins 1 (RESET), 2 (GND), 3 (MR), 4 (GND), and 5 (VCC) identically assigned. However, functional compatibility depends on configuration: MAX6855 is active-high push-pull only, whereas MAX6854 is active-low push-pull and MAX6856 is open-drain - requiring careful review of reset polarity and load requirements before substitution.
MAX6855UK45D6+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:
- 4.5V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 600ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6855UK45D6+T FAQ
1.How can I place an order for MAX6855UK45D6+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6855UK45D6+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 MAX6855UK45D6+T reliable?
The price and inventory of MAX6855UK45D6+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6855UK45D6+T is usually 5 days.
3.What payment methods are accepted for MAX6855UK45D6+T?
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4.How is shipping managed for MAX6855UK45D6+T?
MAX6855UK45D6+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6855UK45D6+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 MAX6855UK45D6+T?
For technical support, including MAX6855UK45D6+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6855UK45D6+T requirements.
6.How does Aetrix verify that MAX6855UK45D6+T is sourced from the original manufacturer or authorized distributors?
All MAX6855UK45D6+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 MAX6855UK45D6+T meets industry standards.
7.What is the process for return or replacement of MAX6855UK45D6+T?
All MAX6855UK45D6+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6855UK45D6+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 MAX6855UK45D6+T part is unused and in its original packaging.
Return procedure for MAX6855UK45D6+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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