My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX6867UK25D3S+T
- Part No.:
- MAX6867UK25D3S+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6867UK25D3S+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,963
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
The MAX6867UK25D3S+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 2.5V reset threshold (±2.5%), 300ms minimum reset timeout (D3), and integrated watchdog timer with 3.3s typical timeout (S suffix). It monitors VCC, responds to manual reset (MR) input, and asserts active-low push-pull RESET during brownout, power-up, or watchdog expiration - used in battery-powered medical and portable electronics.
For engineers reviewing the MAX6867UK25D3S+T datasheet, MAX6867UK25D3S+T pinout, MAX6867UK25D3S+T application, or MAX6867UK25D3S+T equivalent, key selection criteria include its guaranteed reset validity down to VCC = +1.1V, immunity to short VCC transients (<40µs at 100mV overdrive), 250ns MR-to-reset delay, and compatibility with 1.2V–5.5V supply rails.
Technical Context
The MAX6867UK25D3S+T implements a dual-monitoring architecture: a precision bandgap-based voltage detector for VCC supervision and an edge-triggered watchdog timer that clears on any WDI transition (rising or falling) and expires if WDI remains static beyond 3.3s (typ). Its internal 10kΩ MR pullup and glitch rejection (200ns) enable direct switch interfacing without external components.
Reset assertion is latched and held for the full D3 timeout (150–300ms) after VCC rises above 2.5V or MR deasserts; the push-pull RESET output drives low to ≤0.3V at 1.2mA sink (VCC ≥ 2.38V) and high to ≥0.8×VCC when deasserted. The device operates across –40°C to +85°C and draws only 170nA at 2.5V/25°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current | 170nA typ at VCC = 1.8V, TA = +25°C - enables multi-year operation on coin-cell batteries |
| Reset Threshold Voltage | 2.5V ±2.5% (VTH falling) - factory-trimmed for precise brownout detection at 2.5V rail |
| Reset Timeout Period | 150ms min / 300ms max (D3 option) - ensures µP initialization completes before release |
| Watchdog Timeout | 3.3s typ (S suffix) - balances fault coverage and software execution margin |
| VCC Operating Range | 1.2V to 5.5V - supports single-supply operation from Li-ion, alkaline, or regulated rails |
| Reset Validity Limit | Guaranteed to VCC = +1.1V - maintains reliable reset assertion during deep brownout |
| MR Input Glitch Rejection | 200ns - rejects noise spikes without external filtering |
Pinout & Package
Package: 5-pin SOT23-5, lead-free, surface-mount, 2.9mm × 1.6mm footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | WDI | Watchdog input - rising/falling edges clear internal timer; static state >3.3s triggers reset |
| 2 | GND | Ground reference - must connect to system ground plane for noise immunity and reset accuracy |
| 3 | MR | Active-low manual reset - internally pulled up to VCC (10kΩ); logic-low pulse ≥1µs initiates reset |
| 4 | RESET | Active-low push-pull reset output - sinks ≤0.3V @ 1.2mA, sources ≥0.8×VCC; no external pullup needed |
| 5 | VCC | Supply and monitored voltage input - bypass with 0.1µF ceramic capacitor to GND for transient immunity |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 170nA typical supply current extends battery life in always-on portable devices |
| VCC transient immunity | Rejects <40µs VCC glitches at 100mV overdrive - eliminates false resets in noisy environments |
| Guaranteed reset at low VCC | Valid RESET assertion down to VCC = +1.1V - ensures fail-safe behavior during deep undervoltage |
| No external components | Integrated MR pullup (10kΩ), precision voltage reference, and watchdog timer eliminate BOM parts |
| Fast MR response | 250ns MR-to-reset delay enables immediate recovery from operator-initiated reset |
Applications
| Glucose Monitors | Patient Monitoring Devices |
|---|---|
Use Scenario: Continuous glucose sensing in wearable patch pumps requiring multi-month battery life and fail-safe power management. IC Role / Device Role / Timing Role: Supervises 2.5V analog front-end and BLE SoC supply; asserts RESET on brownout or firmware hang via WDI monitoring. Use Value: 170nA quiescent current preserves battery; 300ms D3 timeout ensures ADC calibration completes before µP boot. |
Use Scenario: Portable ECG or SpO₂ units operating from single AA/AAA cells with variable load profiles. IC Role / Device Role / Timing Role: Monitors main 3.3V rail and provides manual reset via tactile button; watchdog guards against sensor firmware lockup. Use Value: Guaranteed reset down to VCC = +1.1V prevents undefined states during battery depletion; 200ns MR glitch rejection avoids spurious resets. |
| Smart Wearables | Industrial Handheld Terminals |
Use Scenario: Fitness trackers with motion sensors and Bluetooth LE, powered by rechargeable LiPo cells. IC Role / Device Role / Timing Role: Resets application MCU on VCC drop below 2.5V or if motion-sensing firmware stalls (WDI timeout). Use Value: 3.3s watchdog period accommodates extended sensor acquisition cycles without false triggers. |
Use Scenario: Ruggedized barcode scanners used in warehouses with intermittent power and ESD exposure. IC Role / Device Role / Timing Role: Provides robust power-on reset and manual recovery; immune to 40µs supply transients induced by motor switching. Use Value: Push-pull RESET eliminates need for external pullup, reducing layout complexity and improving noise margin. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6864UK25D3S+T | Same 2.5V threshold, D3 timeout, S-watchdog, but lacks WDI pin - uses internal oscillator instead of external edge-triggered watchdog | Suitable where software cannot toggle an I/O pin reliably; less flexible for complex timing sequences | Select MAX6864UK25D3S+T only if WDI signal routing is impractical; MAX6867UK25D3S+T offers superior fault coverage with edge-triggered watchdog. |
| TPS3836K25DBVR | 2.5V threshold, 200ms reset timeout, no watchdog, push-pull active-low RESET, 1.6µA ICC - 10× higher supply current | Applicable in non-battery-critical industrial controls where ultra-low ICC is not required | Choose TPS3836K25DBVR only when cost is primary and 170nA vs. 1.6µA ICC has no impact on system lifetime. |
Compared with MAX6864UK25D3S+T and TPS3836K25DBVR, the MAX6867UK25D3S+T uniquely combines ultra-low ICC, edge-triggered watchdog, and guaranteed reset down to 1.1V - making it optimal for long-life, safety-critical portable medical devices.
Availability
MAX6867UK25D3S+T is available at Aetrix Electronics and suitable for glucose monitors, patient monitors, smart wearables, and industrial handheld terminals requiring stable component supply and long-term lifecycle support.
Supply support for MAX6867UK25D3S+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 systems.
The MAX6854–MAX6869 family delivers nanopower supervisory functionality for battery-constrained µP systems, emphasizing ultra-low ICC, wide VCC range, and integrated watchdog capability without external components.
FAQ
What is the exact reset threshold voltage of the MAX6867UK25D3S+T?
The MAX6867UK25D3S+T has a factory-trimmed reset threshold voltage of 2.5V, with tolerance of ±2.5% over –40°C to +85°C. This value is specified for VCC falling conditions and ensures accurate brownout detection for 2.5V-rail systems. The MAX6867UK25D3S+T guarantees reset assertion when VCC drops below this threshold and holds RESET asserted for the full D3 timeout period after recovery.
Does the MAX6867UK25D3S+T require external components for basic operation?
No, the MAX6867UK25D3S+T requires no external components for core functionality: it includes an internal 10kΩ pullup on MR, a precision voltage reference, and a fully integrated watchdog timer. A 0.1µF ceramic capacitor from VCC to GND is recommended for noise immunity but is not strictly required for functional operation. The MAX6867UK25D3S+T's push-pull RESET output eliminates the need for an external pullup resistor.
How does the watchdog timer in the MAX6867UK25D3S+T differ from that in the MAX6864UK25D3S+T?
The MAX6867UK25D3S+T uses an edge-triggered watchdog timer that clears on any rising or falling edge at the WDI pin, enabling precise software control. In contrast, the MAX6864UK25D3S+T relies on an internal oscillator and does not expose WDI - making it less flexible for applications requiring dynamic watchdog timing or multi-stage firmware supervision. The MAX6867UK25D3S+T's WDI interface allows tighter coupling between software execution flow and reset safety.
What is the minimum VCC level at which the MAX6867UK25D3S+T guarantees valid RESET assertion?
The MAX6867UK25D3S+T guarantees valid RESET assertion down to VCC = +1.1V across the full temperature range (–40°C to +85°C). Below this voltage, RESET behavior is not specified. This specification ensures fail-safe operation during deep brownout conditions common in battery-powered systems nearing end-of-life. The MAX6867UK25D3S+T maintains this guarantee while drawing only 170nA typical supply current.
Can the MAX6867UK25D3S+T be used with a 1.8V supply rail?
Yes, the MAX6867UK25D3S+T operates over VCC = 1.2V to 5.5V and is fully specified at 1.8V. At 1.8V, its supply current is 170nA (typ), RESET output sinks ≤0.3V at 500µA, and MR input thresholds scale to 0.3×VCC (low) and 0.7×VCC (high). The 2.5V reset threshold remains fixed and independent of VCC - so it correctly supervises a 2.5V domain even when the MAX6867UK25D3S+T itself is powered from 1.8V (e.g., via separate LDO).
MAX6867UK25D3S+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:
- 2.5V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 150ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6867UK25D3S+T FAQ
1.How can I place an order for MAX6867UK25D3S+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6867UK25D3S+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 MAX6867UK25D3S+T reliable?
The price and inventory of MAX6867UK25D3S+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6867UK25D3S+T is usually 5 days.
3.What payment methods are accepted for MAX6867UK25D3S+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6867UK25D3S+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6867UK25D3S+T?
MAX6867UK25D3S+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6867UK25D3S+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 MAX6867UK25D3S+T?
For technical support, including MAX6867UK25D3S+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6867UK25D3S+T requirements.
6.How does Aetrix verify that MAX6867UK25D3S+T is sourced from the original manufacturer or authorized distributors?
All MAX6867UK25D3S+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 MAX6867UK25D3S+T meets industry standards.
7.What is the process for return or replacement of MAX6867UK25D3S+T?
All MAX6867UK25D3S+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6867UK25D3S+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 MAX6867UK25D3S+T part is unused and in its original packaging.
Return procedure for MAX6867UK25D3S+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX6867UK25D3S+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…
