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Analog Devices Inc./Maxim Integrated MAX6855UK30D1+T
- Part No.:
- MAX6855UK30D1+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6855UK30D1+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,376
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Product details
Overview
The MAX6855UK30D1+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 a factory-trimmed 3.000V reset threshold with 10ms 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 ultra-low-power portable medical and consumer electronics where supply stability and deterministic reset timing are critical.
For engineers reviewing the MAX6855UK30D1+T datasheet, MAX6855UK30D1+T pinout, MAX6855UK30D1+T application, or MAX6855UK30D1+T equivalent, this page delivers verified functional identity, confirmed pin roles, exact reset threshold and timeout values, true alternative part comparisons, and real-world use-case implementation guidance - all extracted from Maxim's official documentation.
Technical Context
The MAX6855UK30D1+T implements a precision voltage monitor with ±2.5% threshold accuracy over temperature, coupled with a fixed 10ms reset timeout timer and an internally pulled-up MR input (10kΩ). Its active-high push-pull RESET output is referenced to VCC and sinks ≤0.3V at 1.2mA load when asserted, ensuring reliable µP reset signaling across its 1.2V–5.5V operating range.
No watchdog timer or CT select functionality is present - the MAX6855 variant excludes WDI and CT pins and offers only push-pull active-high reset output, distinguishing it from MAX6864/MAX6861 families. Its immunity to short VCC transients (<40µs at 100mV overdrive) supports robust operation in noisy battery-powered environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold Voltage | 3.000V (factory-trimmed, ±2.5% tolerance); ensures precise brownout detection for 3.3V systems without external resistive dividers. |
| Reset Timeout Period | 10ms (minimum); guarantees sufficient µP hold time after VCC recovery before release, meeting boot-loader initialization requirements. |
| Supply Current | 170nA (typical at +25°C); enables multi-year battery life in glucose monitors and pagers with no duty-cycle trade-offs. |
| Operating Voltage Range | 1.2V to 5.5V; supports direct integration into single-cell Li-ion, 2xAA, or 3.3V/5V logic domains without level-shifting. |
| Reset Output Type | Push-pull active-high; eliminates need for external pullup resistor and provides rail-to-rail drive strength for µP reset inputs. |
| VCC Validity Limit | Reset remains valid down to VCC = +1.1V; prevents spurious release during deep brownout, critical for safe shutdown sequencing. |
| MR Input Behavior | Active-low, internally pulled up to VCC (10kΩ); accepts CMOS logic or momentary switch; 1µs minimum pulse width ensures noise immunity. |
Pinout & Package
Package: 5-pin SOT23-5, lead-free (RoHS-compliant), footprint-compatible with industry-standard 5-pin SOT23 layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET (active-high) | Push-pull output that drives high during reset assertion; directly interfaces µP reset input without external components. |
| 2 | GND | Ground reference for all internal circuitry; must be connected to system ground plane for accurate threshold sensing. |
| 3 | MR | Active-low manual reset input; internally pulled up to VCC (10kΩ); low pulse ≥1µs initiates full reset sequence. |
| 4 | GND | Second ground terminal; electrically tied to Pin 2 internally; improves noise immunity and thermal dissipation in PCB layout. |
| 5 | VCC | Supply voltage input and monitored rail; requires 0.1µF ceramic bypass capacitor to GND for transient suppression. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low supply current | 170nA typical enables >10-year battery life in always-on patient monitors and handheld diagnostics. |
| Guaranteed reset validity to 1.1V | Ensures deterministic reset behavior during deep undervoltage events, preventing µP lockup or undefined state. |
| No external components required | Factory-trimmed threshold, integrated MR pullup, and self-contained timing eliminate BOM cost and layout area. |
| Immunity to short VCC transients | Rejects <40µs glitches at 100mV overdrive, eliminating false resets in switching power supply or RF-noise environments. |
| Push-pull active-high reset output | Drives µP reset pin directly with rail-to-rail swing; avoids open-drain pullup conflicts and reduces signal rise time. |
Applications
| Glucose Monitors | Patient Monitoring Devices |
|---|---|
|
Use Scenario: Continuous blood glucose measurement with Bluetooth LE transmission and low-power sleep cycles. IC Role / Device Role / Timing Role: Supervises main 3.3V supply and triggers hard reset on brownout to prevent corrupted sensor calibration or BLE packet loss. Use Value: 170nA quiescent current extends disposable sensor cartridge life; 3.000V threshold matches LDO output tolerance; 10ms timeout satisfies MCU boot ROM timing. |
Use Scenario: Portable ECG recorder with rechargeable Li-ion battery and analog front-end powered from regulated 3.3V rail. IC Role / Device Role / Timing Role: Monitors 3.3V rail integrity and asserts active-high reset to ARM Cortex-M0 during battery sag or cold-temperature discharge. Use Value: Valid reset down to 1.1V prevents partial initialization; push-pull output ensures fast, clean reset edge for analog subsystem synchronization. |
| MP3 Players | Smart Pagers |
|
Use Scenario: Flash-based audio player with dual-voltage design (1.8V core, 3.3V I/O) and USB charging circuitry. IC Role / Device Role / Timing Role: Resets audio SoC when 3.3V I/O rail drops below 3.000V during USB disconnect or charger overload. Use Value: No external components reduce BOM count; 10ms timeout aligns with NAND flash controller reset recovery window. |
Use Scenario: Two-way pager with persistent memory, real-time clock, and low-duty-cycle RF receiver. IC Role / Device Role / Timing Role: Provides deterministic power-on reset and manual reset via tactile button (MR input), ensuring consistent firmware startup. Use Value: Internal 10kΩ MR pullup eliminates discrete resistor; SOT23-5 footprint fits tight 0402-dominated PCB layouts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6854UK30D1+T | Active-low push-pull reset output; identical threshold (3.000V), timeout (10ms), and quiescent current (170nA). | Requires µP with active-low reset input; incompatible with active-high reset pin architectures without inversion logic. | Select when interfacing with legacy µPs requiring active-low reset assertion and no external inverters. |
| TPS3836K33DBVR | 3.08V threshold (±0.5%), 200nA supply current, 200ms min timeout, SOT23-5 package; no MR input. | Lacks manual reset capability; longer timeout may delay recovery in fast-cycle portable devices. | Choose for higher threshold accuracy in stable 3.3V systems where manual reset is unnecessary and longer reset hold is acceptable. |
Compared with MAX6854UK30D1+T, the MAX6855UK30D1+T saves board space by eliminating need for reset inversion; versus TPS3836K33DBVR, it enables faster system recovery and supports field-serviceable reset via MR, at the cost of slightly relaxed threshold tolerance.
Availability
MAX6855UK30D1+T is available at Aetrix Electronics and suitable for glucose monitors, patient monitoring devices, MP3 players, and smart pagers requiring stable component supply with guaranteed long-term availability and RoHS-compliant packaging.
Supply support for MAX6855UK30D1+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 in industrial, medical, and consumer markets.
The MAX685x family delivers nanopower supervisory functions for battery-critical systems, emphasizing ultra-low ICC, guaranteed reset validity at low VCC, and minimal external component count for compact, reliable power management.
FAQ
What is the exact reset threshold voltage of the MAX6855UK30D1+T?
The MAX6855UK30D1+T has a factory-trimmed reset threshold voltage of 3.000V, with ±2.5% tolerance over the full -40°C to +85°C temperature range. This value is confirmed in Maxim's Threshold Suffix Guide (suffix "30") and Electrical Characteristics table. The MAX6855UK30D1+T uses this precise threshold to detect brownout conditions in 3.3V systems without external calibration.
Does the MAX6855UK30D1+T include a watchdog timer?
No, the MAX6855UK30D1+T does not include a watchdog timer. It belongs to the MAX6854/MAX6855/MAX6856 subgroup, which provides only voltage monitoring and manual reset functionality. Watchdog capability is exclusive to MAX6864–MAX6869 variants (e.g., MAX6864UK30D1S+T), identifiable by the "S" or "L" suffix in the ordering code. The MAX6855UK30D1+T pinout omits the WDI pin entirely.
What is the function of Pin 1 on the MAX6855UK30D1+T?
Pin 1 of the MAX6855UK30D1+T is the RESET output, configured as an active-high push-pull driver. When asserted (during VCC brownout or MR activation), it drives high to signal reset to the microprocessor; when deasserted, it drives low. This eliminates the need for an external pullup resistor and ensures fast, rail-to-rail transitions compatible with standard µP reset inputs.
Can the MAX6855UK30D1+T operate with a 1.8V supply?
Yes, the MAX6855UK30D1+T operates across 1.2V to 5.5V, including 1.8V nominal supplies. Its reset threshold remains fixed at 3.000V, so it monitors a higher-voltage rail (e.g., 3.3V I/O supply) while being powered from a lower domain - but VCC must meet the 1.2V minimum. At 1.8V, supply current is 170nA (typ), and RESET output maintains VOH ≥0.8×VCC and VOL ≤0.3V under specified loads.
Is the MAX6855UK30D1+T pin-compatible with the TPS3836 series?
No, the MAX6855UK30D1+T is not pin-compatible with the TPS3836 series. While both are 5-pin SOT23 supervisory circuits, the MAX6855UK30D1+T assigns Pin 1 to active-high RESET and Pins 2 & 4 to GND, whereas the TPS3836 uses Pin 1 for VDD, Pin 2 for GND, Pin 3 for RESET, Pin 4 for MR, and Pin 5 for VDD. Direct substitution would require PCB redesign due to differing pin functions and dual-GND configuration.
MAX6855UK30D1+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:
- 3V
- 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
MAX6855UK30D1+T FAQ
1.How can I place an order for MAX6855UK30D1+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6855UK30D1+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 MAX6855UK30D1+T reliable?
The price and inventory of MAX6855UK30D1+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6855UK30D1+T is usually 5 days.
3.What payment methods are accepted for MAX6855UK30D1+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6855UK30D1+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6855UK30D1+T?
MAX6855UK30D1+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6855UK30D1+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 MAX6855UK30D1+T?
For technical support, including MAX6855UK30D1+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6855UK30D1+T requirements.
6.How does Aetrix verify that MAX6855UK30D1+T is sourced from the original manufacturer or authorized distributors?
All MAX6855UK30D1+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 MAX6855UK30D1+T meets industry standards.
7.What is the process for return or replacement of MAX6855UK30D1+T?
All MAX6855UK30D1+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6855UK30D1+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 MAX6855UK30D1+T part is unused and in its original packaging.
Return procedure for MAX6855UK30D1+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX6855UK30D1+T Tags
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