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Analog Devices Inc./Maxim Integrated MAX6855UK26D1+T
- Part No.:
- MAX6855UK26D1+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6855UK26D1+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,969
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Product details
Overview
The MAX6855UK26D1+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in a 5-pin SOT23 package, providing voltage monitoring, manual reset input (MR), and push-pull active-high RESET output. It asserts reset when VCC drops below 2.625V (factory-trimmed threshold), MR is pulled low, or - in watchdog-enabled variants - WDI timeout occurs; reset remains asserted for ≥10ms after recovery. Designed for ultra-low-power portable systems including glucose monitors and MP3 players.
For engineers reviewing the MAX6855UK26D1+T datasheet, MAX6855UK26D1+T pinout, MAX6855UK26D1+T application, or MAX6855UK26D1+T equivalent, key selection criteria include its 2.625V reset threshold, 10ms minimum reset timeout, 170nA typical supply current at 2.5V, guaranteed reset validity down to VCC = +1.1V, and compatibility with CMOS-level MR inputs.
Technical Context
This device implements a precision bandgap-based voltage monitor with 2.5% threshold accuracy over –40°C to +85°C, coupled with a digital reset timeout timer and internal 10kΩ MR pullup. Its reset assertion logic combines asynchronous VCC-fall detection and synchronous MR edge response, with glitch rejection of 200ns on MR and immunity to VCC transients ≤40µs at 100mV overdrive.
The MAX6855UK26D1+T belongs to the MAX6854–MAX6869 family but excludes watchdog timer (WDI) and CT pin functionality. It delivers push-pull active-high RESET output referenced to VCC, requiring no external components, and guarantees VOL ≤0.3V at ISINK = 1.2mA (VCC ≥ 2.38V) and VOH ≥ 0.8×VCC at ISOURCE = 500µA (VCC ≥ 2.38V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold Voltage | 2.625V (factory-trimmed, ±2.5% tolerance); ensures reliable brownout detection for 2.7V–3.3V logic domains. |
| Supply Current (typ) | 170nA at VCC = 2.5V, TA = +25°C; enables multi-year battery life in coin-cell-powered medical devices. |
| Reset Timeout Period | 10ms (minimum); provides sufficient hold time for µP power-up sequencing without excessive delay. |
| Operating Voltage Range | 1.2V to 5.5V; supports single-supply operation across Li-ion, alkaline, and regulated 3.3V/5V rails. |
| Reset Output Type | Push-pull active-high; eliminates need for external pullup and drives high-impedance µP reset inputs directly. |
| VCC Reset Validity Limit | Guaranteed down to VCC = +1.1V; ensures deterministic reset behavior during deep brownout conditions. |
| MR Input Logic | Active-low with 10kΩ internal pullup to VCC; accepts CMOS-compatible signals and supports momentary switch interface without external biasing. |
Pinout & Package
Package: 5-pin SOT23-5, lead-free, surface-mount, footprint compatible with industry-standard 5-pin SOT23 layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Push-pull active-high reset output; drives high when VCC ≥ 2.625V and MR is deasserted; sinks up to 1.2mA. |
| 2 | GND | Ground reference for all internal circuitry and reset output; must be connected to system ground plane. |
| 3 | MR | Active-low manual reset input; internally pulled up to VCC (10kΩ); triggers reset when pulled ≤0.3×VCC. |
| 4 | GND | Second ground terminal; electrically tied to Pin 2 internally; improves noise immunity in high-frequency environments. |
| 5 | VCC | Supply voltage input and monitored rail; requires 0.1µF bypass capacitor to GND for stable operation. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low supply current | 170nA typical at 2.5V enables >10-year battery life in always-on wearable health monitors. |
| Factory-trimmed reset threshold | 2.625V ±2.5% eliminates calibration overhead and ensures consistent power-rail monitoring across production lots. |
| No external components required | Integrated MR pullup, precision voltage reference, and timeout timer reduce BOM count and PCB area by ≥3 passive parts. |
| Immunity to short VCC transients | Rejects glitches ≤40µs duration at 100mV overdrive, preventing spurious resets in noisy automotive or industrial environments. |
| Guaranteed reset validity to 1.1V | Ensures deterministic reset state during deep undervoltage events where most µPs lose functional integrity. |
Applications
| Glucose Monitors | MP3 Players |
|---|---|
Use Scenario: Continuous blood glucose sensing with Bluetooth LE transmission and low-power sleep modes. IC Role / Device Role / Timing Role: Supervises 3.0V main supply and asserts active-high RESET to ARM Cortex-M0+ MCU upon brownout or user-initiated recalibration. Use Value: 170nA quiescent current extends CR2032 battery life beyond 24 months; 10ms timeout aligns with MCU boot ROM initialization timing. |
Use Scenario: Portable audio playback with flash memory storage, DAC, and headphone amplifier powered from single Li-ion cell. IC Role / Device Role / Timing Role: Monitors regulated 3.3V rail feeding audio subsystem; generates clean reset pulse on power-up and button-press events. Use Value: Push-pull active-high output interfaces directly to reset pin of Wolfson WM8978 codec without level-shifting; 2.625V threshold matches LDO dropout margin. |
| Patient Monitors | Cell Phones (Feature Phones) |
Use Scenario: Battery-backed ECG acquisition unit with real-time display and data logging to SD card. IC Role / Device Role / Timing Role: Provides fail-safe reset supervision for dual-rail (1.8V/3.3V) system; MR pin wired to emergency reset button. Use Value: Guaranteed reset operation down to VCC = 1.1V prevents undefined MCU state during critical battery depletion; 2.5% threshold accuracy meets IEC 60601-1 safety margin requirements. |
Use Scenario: Entry-level GSM handset with STN display, baseband processor, and PMIC managing multiple voltage domains. IC Role / Device Role / Timing Role: Supervises 2.8V core supply to baseband ASIC; RESET signal synchronized to power-good sequence from PMIC. Use Value: 5-pin SOT23 footprint minimizes layout space in constrained RF module zones; no external RC network reduces manufacturing test points. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3837K26DBVR | 2.63V reset threshold, 200ms min timeout, open-drain active-low output, 2.5µA ICC (typ) | Requires external pullup resistor; higher supply current limits use in multi-year battery applications. | Select when legacy board design uses open-drain reset and longer timeout is acceptable. |
| MAX6369KA26+T | 2.63V threshold, 140ms min timeout, push-pull active-low output, 1.2µA ICC (typ) | Active-low output conflicts with µP reset polarity; 7× higher ICC reduces battery lifetime in ultra-low-power systems. | Choose only if active-low reset is mandatory and 10ms timeout is not required for boot timing compliance. |
Compared with TPS3837K26DBVR and MAX6369KA26+T, the MAX6855UK26D1+T offers the lowest supply current (170nA vs. ≥1.2µA), shortest configurable timeout (10ms), and active-high push-pull output eliminating external components - making it optimal for space-constrained, long-life medical and portable electronics.
Availability
MAX6855UK26D1+T is available at Aetrix Electronics and suitable for glucose monitors, patient monitors, and MP3 players requiring stable component supply, long-term lifecycle support, and lead-free compliance.
Supply support for MAX6855UK26D1+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 applications in industrial, medical, and consumer markets.
The MAX6854–MAX6869 product line delivers nanopower supervisory circuits optimized for battery-critical portable electronics, emphasizing ultra-low ICC, guaranteed reset validity at sub-1.2V VCC, and minimal external component count.
FAQ
What is the exact reset threshold voltage of the MAX6855UK26D1+T?
The MAX6855UK26D1+T has a factory-trimmed reset threshold voltage of 2.625V, with guaranteed tolerance of ±2.5% over the full operating temperature range (–40°C to +85°C). This value is confirmed in Table 2 (Threshold Suffix Guide) of the datasheet, where suffix "26" corresponds to 2.625V nominal. The MAX6855UK26D1+T does not support adjustable thresholds or external resistor programming.
Does the MAX6855UK26D1+T include a watchdog timer function?
No, the MAX6855UK26D1+T does not include a watchdog timer. Per the Selector Guide and Pin Description sections, only MAX6864–MAX6869 variants feature WDI input; the MAX6855UK26D1+T is a manual-reset-only supervisory circuit with MR and RESET pins only. Its part number lacks a watchdog suffix (e.g., "S" or "L"), confirming absence of watchdog functionality.
What is the reset timeout period for the MAX6855UK26D1+T?
The MAX6855UK26D1+T has a fixed minimum reset timeout period of 10ms, indicated by the "D1" suffix in its part number. Electrical Characteristics table confirms tRP = 10ms (min), 15ms (typ), 25ms (max) under VCC = VTH + 150mV conditions. This timeout is non-adjustable and applies after VCC rises above threshold or MR is released.
What output type does the MAX6855UK26D1+T provide?
The MAX6855UK26D1+T provides a push-pull active-high RESET output, as specified in the Pin Description table and Selector Guide. When asserted, RESET goes low; when deasserted, it drives high to VCC. This eliminates the need for an external pullup resistor and ensures fast, rail-to-rail logic transitions compatible with modern µP reset inputs.
Is the MAX6855UK26D1+T pin-compatible with other devices in the MAX6854–MAX6869 family?
The MAX6855UK26D1+T shares the same 5-pin SOT23-5 package and pinout (Pin 1: RESET, Pin 2: GND, Pin 3: MR, Pin 4: GND, Pin 5: VCC) with MAX6854, MAX6856, MAX6861–MAX6863, and MAX6864–MAX6869. However, functional pin assignments differ: MAX6855UK26D1+T uses Pin 1 for active-high push-pull RESET, while MAX6854 uses Pin 1 for active-low output - direct substitution requires verification of reset polarity and timeout requirements.
MAX6855UK26D1+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:
- 2.625V
- 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
MAX6855UK26D1+T FAQ
1.How can I place an order for MAX6855UK26D1+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6855UK26D1+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 MAX6855UK26D1+T reliable?
The price and inventory of MAX6855UK26D1+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6855UK26D1+T is usually 5 days.
3.What payment methods are accepted for MAX6855UK26D1+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6855UK26D1+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6855UK26D1+T?
MAX6855UK26D1+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6855UK26D1+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 MAX6855UK26D1+T?
For technical support, including MAX6855UK26D1+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6855UK26D1+T requirements.
6.How does Aetrix verify that MAX6855UK26D1+T is sourced from the original manufacturer or authorized distributors?
All MAX6855UK26D1+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 MAX6855UK26D1+T meets industry standards.
7.What is the process for return or replacement of MAX6855UK26D1+T?
All MAX6855UK26D1+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6855UK26D1+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 MAX6855UK26D1+T part is unused and in its original packaging.
Return procedure for MAX6855UK26D1+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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