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Analog Devices Inc./Maxim Integrated MAX6855UK20D4+T
- Part No.:
- MAX6855UK20D4+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6855UK20D4+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,456
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Product details
Overview
The MAX6855UK20D4+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 2.0V reset threshold with 1200ms minimum reset timeout. It monitors VCC supply integrity, asserts reset during brownout or manual trigger, and guarantees valid reset operation down to VCC = +1.1V. It is designed for low-power portable systems requiring reliable power-on reset and system recovery.
For engineers reviewing the MAX6855UK20D4+T datasheet, MAX6855UK20D4+T pinout, MAX6855UK20D4+T application, or MAX6855UK20D4+T equivalent, this page delivers verified functional identity, exact pin roles, confirmed timing parameters, real-world use cases, and validated alternative options - all grounded in Maxim's official specifications for the precise part number.
Technical Context
This device implements a voltage-monitoring comparator with 2.5% threshold accuracy, hysteresis of 0.5% VTH, and ultra-low 170nA typical supply current at VCC = 1.8V. Its reset assertion logic responds to VCC falling below 2.0V, MR low pulse ≥1µs, and maintains reset deassertion for ≥1200ms after VCC rises above threshold and MR releases.
The active-high push-pull RESET output drives high with VOH ≥0.8×VCC (ISOURCE = 500µA) and sinks low with VOL ≤0.3V (ISINK = 1.2mA), referenced directly to VCC. Internal 10kΩ MR pullup ensures robust noise immunity without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.0V ±2.5% - precisely trimmed to monitor 2.0V rails; ensures deterministic reset initiation during brownout |
| Reset Timeout Period | 1200ms min - holds µP in reset long enough for full power stabilization and oscillator startup |
| Supply Current | 170nA typ at VCC = 1.8V - enables multi-year battery life in always-on medical and IoT sensors |
| Operating Voltage Range | 1.2V to 5.5V - supports single-cell Li-ion, coin-cell, and multi-rail embedded systems |
| Reset Valid Down To | VCC = +1.1V - guarantees reset assertion even during deep brownout, preventing undefined µP states |
| MR Input Pulse Width | ≥1µs - accepts short, debounced manual reset signals without external timing circuitry |
| Output Type | Active-high push-pull - eliminates need for external pullup resistor; compatible with standard CMOS reset inputs |
Pinout & Package
Package: 5-pin SOT23-5, surface-mount, lead-free (RoHS-compliant), 2.9mm × 1.6mm footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-high push-pull reset output - drives high to release µP reset; no external pullup required |
| 2 | GND | Ground reference - must be connected to system ground plane for accurate voltage monitoring |
| 3 | MR | Active-low manual reset input - internally pulled up to VCC via 10kΩ; triggers reset when pulled low ≥1µs |
| 4 | GND | Second ground terminal - electrically tied to Pin 2 internally; improves noise immunity in noisy layouts |
| 5 | VCC | Supply voltage input - monitored rail; requires 0.1µF bypass capacitor to GND for transient suppression |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 170nA typical supply current - extends battery life in glucose monitors and wearable health devices |
| Guaranteed reset validity | Operates reliably down to VCC = +1.1V - prevents µP lockup during severe undervoltage conditions |
| No external components | Integrated MR pullup and precision voltage reference - reduces BOM count and PCB area |
| Immunity to VCC transients | Rejects ≤40µs transients at 100mV overdrive - avoids false resets in electrically noisy environments |
| Push-pull active-high RESET | Direct interface to µP reset pins requiring high-level assertion - simplifies layout and eliminates pullup resistor |
Applications
| Portable Medical Devices | Battery-Powered IoT Sensors |
|---|---|
Use Scenario: Glucose meters and patient monitors operating from single CR2032 coin cells with intermittent usage over multi-year lifetimes. IC Role / Device Role / Timing Role: Supervisory circuit providing power-on reset, brownout detection, and manual reset via tactile button. Use Value: 170nA quiescent current enables >5-year shelf life; 1200ms timeout ensures stable MCU initialization after cold start. |
Use Scenario: Wireless environmental sensors deployed in remote locations, powered by primary lithium batteries. IC Role / Device Role / Timing Role: Voltage supervisor asserting active-high reset to ARM Cortex-M0+ during battery voltage sag or wake-up events. Use Value: Valid reset down to VCC = +1.1V prevents firmware corruption during end-of-life battery discharge. |
| Wearable Health Trackers | Low-Power Industrial Handhelds |
Use Scenario: Fitness bands using rechargeable LiPo cells with tight space constraints and aggressive power gating. IC Role / Device Role / Timing Role: Nanopower supervisor enabling clean boot sequence after deep-sleep wake-up and manual reset via capacitive touch. Use Value: Push-pull active-high RESET eliminates external pullup, saving board space and leakage paths in miniaturized designs. |
Use Scenario: Rugged handheld test equipment powered by alkaline AA batteries in field-deployed industrial settings. IC Role / Device Role / Timing Role: Reset controller interfacing with legacy µP reset inputs requiring active-high assertion and glitch immunity. Use Value: 2.5% reset threshold tolerance and 40µs transient rejection ensure reliable operation amid motor-switching EMI. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6854UK20D4+T | Active-low push-pull RESET output; identical threshold, timeout, and ICC | Requires µP with active-low reset input; incompatible with active-high-only reset pins | Select when target µP uses active-low reset signaling and board layout already accommodates pullup-free drive |
| TPS3837K20DBVR | 2.0V threshold, 1200ms timeout, but 1.2µA typical ICC - ~7× higher quiescent current | Suitable for cost-sensitive industrial designs where battery life is secondary to procurement availability | Choose only if MAX6855UK20D4+T supply lead times are constrained; verify µP reset polarity compatibility |
Compared with MAX6855UK20D4+T, the MAX6854UK20D4+T offers identical supervision functionality but inverted reset polarity, while the TPS3837K20DBVR trades nanopower efficiency for broader distributor stock and TI's long-term product assurance - making it viable only when ultra-low ICC is not critical.
Availability
MAX6855UK20D4+T is available at Aetrix Electronics and suitable for portable medical devices, battery-powered IoT sensors, wearable health trackers, and low-power industrial handhelds requiring stable component supply across extended production cycles.
Supply support for MAX6855UK20D4+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 demanding industrial, medical, and communications applications.
The MAX6855UK20D4+T belongs to Maxim's nanopower µP supervisory family, engineered specifically for battery-critical applications where sub-µA quiescent current, guaranteed reset validity below 1.2V, and minimal external components are mandatory design requirements.
FAQ
What is the exact reset threshold voltage of the MAX6855UK20D4+T?
The MAX6855UK20D4+T has a factory-trimmed reset threshold of 2.0V, with guaranteed tolerance of ±2.5% over the full -40°C to +85°C temperature range. This value is confirmed in Maxim's Electrical Characteristics table and corresponds to the "20" suffix in the part number per the Threshold Suffix Guide. The MAX6855UK20D4+T asserts reset when VCC falls below this threshold and holds reset for ≥1200ms after VCC recovers.
Does the MAX6855UK20D4+T include a watchdog timer function?
No, the MAX6855UK20D4+T does not include a watchdog timer. Per Maxim's Selector Guide and Pin Description tables, only MAX6864–MAX6869 variants feature WDI input and watchdog timeout functionality. The MAX6855UK20D4+T provides voltage monitoring, manual reset (MR), and fixed 1200ms reset timeout - no watchdog circuitry is present or enabled in this specific variant.
What is the function of Pin 4 on the MAX6855UK20D4+T?
Pin 4 on the MAX6855UK20D4+T is a second GND terminal, electrically connected internally to Pin 2 (GND). Its inclusion improves noise immunity and thermal performance in high-density layouts by reducing ground loop impedance and distributing return current. It must be soldered to the same ground plane as Pin 2 - no separate routing or isolation is permitted.
Can the MAX6855UK20D4+T operate from a 1.5V supply?
Yes, the MAX6855UK20D4+T operates from VCC = 1.2V to 5.5V, so 1.5V is within specification. However, its 2.0V reset threshold means it will assert reset continuously at 1.5V - it is intended to monitor a higher-voltage rail (e.g., 2.0V, 3.3V, or 5.0V) while being powered from that same rail. It cannot supervise a rail lower than its threshold voltage.
Is the MAX6855UK20D4+T pin-compatible with other parts in the MAX6854–MAX6869 family?
Yes, the MAX6855UK20D4+T shares the same 5-pin SOT23-5 package and pinout as MAX6854/MAX6856/MAX6858/MAX6860–MAX6869 variants. Pin 1 is RESET, Pins 2 & 4 are GND, Pin 3 is MR, and Pin 5 is VCC - consistent across all non-watchdog, non-CT variants. This allows drop-in replacement among same-output-type parts (e.g., MAX6854UK20D4+T for active-low versions), provided reset polarity matches the host µP.
MAX6855UK20D4+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:
- 2V
- 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
MAX6855UK20D4+T FAQ
1.How can I place an order for MAX6855UK20D4+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6855UK20D4+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 MAX6855UK20D4+T reliable?
The price and inventory of MAX6855UK20D4+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6855UK20D4+T is usually 5 days.
3.What payment methods are accepted for MAX6855UK20D4+T?
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4.How is shipping managed for MAX6855UK20D4+T?
MAX6855UK20D4+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6855UK20D4+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 MAX6855UK20D4+T?
For technical support, including MAX6855UK20D4+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6855UK20D4+T requirements.
6.How does Aetrix verify that MAX6855UK20D4+T is sourced from the original manufacturer or authorized distributors?
All MAX6855UK20D4+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 MAX6855UK20D4+T meets industry standards.
7.What is the process for return or replacement of MAX6855UK20D4+T?
All MAX6855UK20D4+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6855UK20D4+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 MAX6855UK20D4+T part is unused and in its original packaging.
Return procedure for MAX6855UK20D4+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX6855UK20D4+T Tags
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MIC826SYMT-TR
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APX803L20-29SA-7
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