My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX6855UK22D4+T
- Part No.:
- MAX6855UK22D4+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6855UK22D4+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,544
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
The MAX6855UK22D4+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in a 5-pin SOT23 package, featuring ultra-low 170nA typical supply current, a factory-trimmed 2.235V reset threshold (suffix "22"), and a 1200ms minimum reset timeout (suffix "D4"). It provides active-low push-pull reset output, manual reset input (MR), and operates across –40°C to +85°C. It is used in battery-powered glucose monitors to ensure reliable µP reset during brownout conditions.
For engineers reviewing the MAX6855UK22D4+T datasheet, MAX6855UK22D4+T pinout, MAX6855UK22D4+T application, or MAX6855UK22D4+T equivalent, key selection criteria include guaranteed reset validity down to VCC = +1.1V, immunity to short VCC transients (<40µs at 100mV overdrive), no external components required, and compatibility with portable medical and handheld electronics requiring long battery life and robust power monitoring.
Technical Context
This device integrates voltage monitoring, manual reset assertion, and reset timing logic - but excludes watchdog timer functionality (absent in MAX6855 family members). Its internal 10kΩ MR pullup enables direct switch interfacing without external biasing.
The reset output remains asserted for ≥1200ms after VCC rises above 2.235V and MR deasserts, ensuring sufficient µP initialization time. Reset is guaranteed valid down to VCC = +1.1V, supporting operation during deep brownout recovery where many µPs remain functional.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current | 170nA typical at +25°C - enables multi-year battery life in always-on medical sensors. |
| Reset Threshold Voltage | 2.235V ±2.5% - factory-trimmed for precise detection of 2.2V–2.3V rail collapse. |
| Reset Timeout Period | 1200ms minimum - ensures full µP boot sequence completion before release. |
| VCC Operating Range | 1.2V to 5.5V - supports single-cell Li-ion, coin-cell, and multi-rail systems. |
| Reset Output Type | Active-low push-pull - drives µP reset pin directly without external pullup resistor. |
| MR Input Logic | Active-low with 10kΩ internal pullup - simplifies momentary switch interface and reduces BOM count. |
| Reset Validity Limit | Down to VCC = +1.1V - maintains deterministic reset state during severe undervoltage events. |
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 | Active-low push-pull output; asserts low on VCC drop below 2.235V or MR low; deasserts after 1200ms timeout. |
| 2 | GND | Ground reference for all internal circuitry and reset output sink path. |
| 3 | MR | Active-low manual reset input; internally pulled up to VCC via 10kΩ; accepts CMOS-level signals. |
| 4 | GND | Second ground terminal - must be connected to same potential as Pin 2 for noise immunity. |
| 5 | VCC | Supply input monitored for reset generation; bypass with 0.1µF capacitor to GND per layout best practice. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 170nA typical enables >10-year operation on CR2032 in intermittent-sensing devices. |
| No external components | Eliminates need for pullups, timing capacitors, or voltage dividers - reduces PCB area and assembly cost. |
| Guaranteed reset at VCC = +1.1V | Ensures deterministic behavior during deep brownout when µP may still execute code. |
| Immunity to short VCC transients | Rejects <40µs glitches at 100mV overdrive - prevents spurious resets in noisy power environments. |
| Pin-compatible with TPS3836/TPS3837/TPS3838 | Enables drop-in replacement in existing designs using TI's supervisory ICs without layout change. |
Applications
| Glucose Monitors | Patient Monitors |
|---|---|
|
Use Scenario: Continuous glucose sensing with Bluetooth LE transmission powered by coin-cell battery. IC Role / Device Role / Timing Role: Supervises 2.2V analog front-end and BLE SoC supply; asserts reset if battery sags below 2.235V during RF burst. Use Value: Prevents corrupted sensor readings or failed BLE handshakes due to marginal VCC, extending usable battery life by avoiding premature shutdown. |
Use Scenario: Portable ECG device with dual-supply (3.3V digital, 2.2V analog) and low-power sleep mode. IC Role / Device Role / Timing Role: Monitors 2.2V analog rail; triggers 1200ms reset to reinitialize ADC and signal chain after wake-up brownout. Use Value: Guarantees clean analog acquisition startup after sleep, eliminating baseline drift caused by incomplete µP initialization. |
| MP3 Players | PDAs |
|
Use Scenario: Flash-based audio player using single 3.7V Li-ion cell with buck-boost regulator generating 2.2V system rail. IC Role / Device Role / Timing Role: Resets audio DSP and NAND controller when regulated 2.2V rail drops during high-current decode bursts. Use Value: Avoids audio artifacts or file corruption by enforcing full subsystem reset instead of relying on µP's internal POR. |
Use Scenario: Legacy PDA with ARM9 processor and 2.2V I/O supply, operating from removable AA battery pack. IC Role / Device Role / Timing Role: Provides synchronized reset to processor, touchscreen controller, and SRAM upon battery insertion or low-voltage detection. Use Value: Eliminates boot hangs caused by asynchronous power sequencing between 2.2V and 3.3V domains. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6854UK22D4+T | Same 2.235V threshold and 1200ms timeout, but active-low open-drain RESET output (requires external pullup). | Suitable where level-shifting or mixed-voltage reset signaling is needed (e.g., 2.2V supervisor driving 3.3V µP reset). | Select MAX6854UK22D4+T only if open-drain flexibility is required; otherwise MAX6855UK22D4+T reduces component count. |
| TPS3836K22DBVR | 2.2V threshold (±1.5%), 1200ms timeout, active-low push-pull, but 2.5µA typical ICC - ~15× higher quiescent current. | Better suited for mains-powered or rechargeable systems where ultra-low ICC is not critical. | Choose TPS3836K22DBVR only if legacy TI design reuse or tighter threshold tolerance is prioritized over battery life. |
Compared with MAX6855UK22D4+T, MAX6854UK22D4+T trades integrated push-pull drive for open-drain versatility, while TPS3836K22DBVR offers tighter threshold accuracy at the cost of 15× higher supply current - making MAX6855UK22D4+T optimal for energy-constrained medical and portable applications.
Availability
MAX6855UK22D4+T is available at Aetrix Electronics and suitable for glucose monitors, patient monitors, MP3 players, and PDAs requiring stable component supply with long-term lifecycle support and lead-free compliance.
Supply support for MAX6855UK22D4+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, mixed-signal, and power management ICs for industrial, medical, and communications applications.
The MAX685x family targets ultra-low-power microprocessor supervision in battery-critical systems, emphasizing nanoscale current consumption, guaranteed low-VCC operation, and minimal external component requirements.
FAQ
What is the exact reset threshold voltage of the MAX6855UK22D4+T?
The MAX6855UK22D4+T has a factory-trimmed reset threshold voltage of 2.235V, with ±2.5% tolerance over temperature (–40°C to +85°C). This value is defined by the "22" suffix in the part number and is confirmed in Table 2 (Threshold Suffix Guide) of the datasheet. The MAX6855UK22D4+T asserts reset when VCC falls below this threshold and holds reset for ≥1200ms after VCC exceeds it.
Does the MAX6855UK22D4+T include a watchdog timer?
No, the MAX6855UK22D4+T does not include a watchdog timer. Watchdog functionality is exclusive to the MAX6864–MAX6869 variants (e.g., MAX6864UK22D4S+T). The MAX6855UK22D4+T provides only voltage monitoring, manual reset input (MR), and fixed 1200ms reset timeout - as confirmed in the Selector Guide and Pin Description sections of the datasheet.
What is the function of Pin 4 on the MAX6855UK22D4+T?
Pin 4 on the MAX6855UK22D4+T is a second GND terminal, electrically tied to Pin 2 (GND). Both ground pins must be connected to the same low-impedance ground plane to ensure noise immunity and proper reset timing. This dual-GND configuration improves PSRR and reduces ground bounce during reset assertion, as specified in the Pin Configurations diagram and Absolute Maximum Ratings table.
Can the MAX6855UK22D4+T operate with VCC below 1.2V?
The MAX6855UK22D4+T guarantees functional reset assertion down to VCC = +1.1V, though its specified operating range begins at 1.2V. Below 1.2V, reset remains valid and asserted until VCC rises above 2.235V, but supply current and timing parameters are not characterized. This 1.1V guarantee ensures fail-safe behavior during deep brownout - a key specification explicitly stated in the Electrical Characteristics table.
Is the MAX6855UK22D4+T pin-compatible with other supervisory ICs?
Yes, the MAX6855UK22D4+T is pin-compatible with the Texas Instruments TPS3836/TPS3837/TPS3838 series, as noted in the Features section of the datasheet. This compatibility applies to the 5-pin SOT23 layout, including identical VCC, GND, MR, RESET, and second-GND pin assignments - enabling direct substitution in existing designs without PCB revision.
MAX6855UK22D4+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:
- 2.188V
- 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
MAX6855UK22D4+T FAQ
1.How can I place an order for MAX6855UK22D4+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6855UK22D4+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 MAX6855UK22D4+T reliable?
The price and inventory of MAX6855UK22D4+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6855UK22D4+T is usually 5 days.
3.What payment methods are accepted for MAX6855UK22D4+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6855UK22D4+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6855UK22D4+T?
MAX6855UK22D4+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6855UK22D4+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 MAX6855UK22D4+T?
For technical support, including MAX6855UK22D4+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6855UK22D4+T requirements.
6.How does Aetrix verify that MAX6855UK22D4+T is sourced from the original manufacturer or authorized distributors?
All MAX6855UK22D4+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 MAX6855UK22D4+T meets industry standards.
7.What is the process for return or replacement of MAX6855UK22D4+T?
All MAX6855UK22D4+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6855UK22D4+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 MAX6855UK22D4+T part is unused and in its original packaging.
Return procedure for MAX6855UK22D4+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX6855UK22D4+T Tags
-
MIC826SYMT-TR
Microchip Technology
-
APX803S-31SA-7
Diodes Incorporated
-
APX803L20-29SA-7
Diodes Incorporated
-
TPS3828-33DBVR
Texas Instruments
-
V6340RSP3B+
EM Microelectronic
-
EM6325CXSP5B-2.9+
EM Microelectronic
-
MCP120T-300I/TT
Microchip Technology
-
MCP130T-315I/TT
Microchip Technology
-
MCP120T-475I/TT
Microchip Technology
-
MCP111T-300E/TT
Microchip Technology
-
MCP120T-315I/TT
Microchip Technology
-
MCP809T-315I/TT
Microchip Technology
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
