My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX6422US44-T
- Part No.:
- MAX6422US44-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-253-4, TO-253AA
- Datasheet:
-
MAX6422US44-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT143-4
- Quantity:
- Payment:
- Shipping:
Inventory:15,000
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MAX6422US44-T from Maxim Integrated is a low-power microprocessor supervisor IC in SOT143-4 package, providing active-high push-pull reset output with factory-trimmed 4.375V reset threshold (suffix "44"), capacitor-adjustable reset timeout delay, and guaranteed operation down to VCC = 1V. It monitors system supply voltage during power-up, brownout, and power-down to prevent µP code-execution errors in battery-powered controllers and portable medical instruments.
For engineers reviewing the MAX6422US44-T datasheet, MAX6422US44-T pinout, MAX6422US44-T application, or MAX6422US44-T equivalent, key selection criteria include its 4.375V threshold accuracy (±1.5% at +25°C), 1.6µA typical quiescent current, SC70/SOT143-compatible footprint, and capacitor-based timeout tuning via SRT pin.
Technical Context
The MAX6422US44-T implements a precision bandgap-based voltage detector with 4.375V nominal reset threshold and 4.3mV hysteresis (≈0.1% of VTH). Its reset assertion logic responds to VCC falling below threshold with 80µs typical delay, and deassertion occurs after a user-defined timeout period set by an external capacitor on the SRT pin.
Internally, a 240nA current source charges the SRT capacitor; reset deassertion triggers when the ramp voltage reaches 0.65V. The device guarantees valid active-high RESET output for VCC ≥ 1V and remains functional across –40°C to +125°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.375V ±1.5% (typ) - sets precise brownout detection point for 4.5V systems |
| Quiescent Current | 1.6µA (typ) - enables multi-year battery life in always-on monitoring applications |
| Reset Timeout Range | 0.275ms to >5ms - adjustable via external capacitor (CSRT = 0 to 1500pF) |
| VCC Operating Range | 1.0V to 5.5V - ensures reliable reset assertion even during deep brownout |
| Output Type | Active-high push-pull - drives µP reset input directly without pullup resistor |
| Temperature Range | –40°C to +125°C - qualified for automotive and industrial embedded environments |
| Reset Delay (tRD) | 80µs (typ) - provides immunity to sub-100µs VCC transients |
Pinout & Package
MAX6422US44-T is housed in a 4-pin SOT143-4 surface-mount package (outline 21-0052), measuring 2.1mm × 2.3mm × 0.95mm, with gull-wing leads and RoHS-compliant finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VCC | Supply voltage input and reset threshold monitor node - connects to system rail being supervised |
| 2 | GND | Analog ground reference - must be connected to low-impedance system ground plane |
| 3 | RESET | Active-high push-pull reset output - drives µP /RESET pin directly; sinks/source up to 3.2mA/800µA |
| 4 | SRT | Set-reset-time input - connects to external timing capacitor; 240nA internal current source sets timeout |
Key Features
| Feature | Design Value |
|---|---|
| Capacitor-adjustable timeout | Enables precise reset hold time tuning (0.275ms–5ms+) without firmware or external logic |
| Low 1.6µA quiescent current | Minimizes battery drain in always-connected portable equipment and remote sensors |
| Guaranteed operation to VCC = 1V | Ensures deterministic reset behavior during deep undervoltage conditions before system collapse |
| Immunity to short VCC transients | Rejects glitches ≤50µs wide when VCC dips 100mV below threshold - reduces false resets |
| Laser-trimmed threshold accuracy | ±1.5% tolerance at +25°C eliminates need for external calibration in production test |
Applications
| Battery-Powered Controllers | Portable Medical Instruments |
|---|---|
Use Scenario: A handheld glucose meter operates from a single Li-ion cell (3.0–4.2V) and must guarantee clean µP restart after battery insertion or low-voltage recovery. IC Role / Device Role / Timing Role: MAX6422US44-T supervises the 3.3V LDO output, asserting active-high RESET until VCC stabilizes above 4.375V and holds it for ≥100ms via CSRT = 1000pF. Use Value: Prevents erratic boot sequences caused by marginal LDO startup, ensuring FDA-compliant deterministic initialization. | Use Scenario: An ambulatory ECG patch uses ultra-low-power µP and must survive repeated partial discharge cycles without firmware corruption. IC Role / Device Role / Timing Role: MAX6422US44-T monitors the main 3.3V rail, triggering reset when voltage sags below 4.375V during RF transmission bursts, with timeout tuned to 2ms. Use Value: Eliminates data loss or memory corruption during transient brownouts, meeting IEC 60601-1 reliability requirements. |
| Automotive Body Control Modules | Industrial Embedded Controllers |
Use Scenario: A LIN bus node in a vehicle door module experiences load-dump-induced supply fluctuations during ignition cycling. IC Role / Device Role / Timing Role: MAX6422US44-T supervises the 5V system rail, asserting RESET on each 12V-to-5V regulator dip, with timeout set to 500ms to cover worst-case regulator recovery. Use Value: Ensures µP reinitialization only after stable power is restored - avoids spurious CAN/LIN communication faults. | Use Scenario: A programmable logic controller (PLC) I/O module requires fail-safe reboot if 24V-to-3.3V DC/DC converter output drops during ESD event. IC Role / Device Role / Timing Role: MAX6422US44-T monitors the isolated 3.3V domain, using CSRT = 470pF to generate 1.5ms reset pulse synchronized to converter recovery. Use Value: Guarantees deterministic state machine reset without software intervention, satisfying IEC 61508 SIL-2 functional safety constraints. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6422XS44-T | Identical electrical specs and reset threshold, but in SC70-4 package (2.0mm × 2.1mm) | Requires PCB land pattern change; better suited for ultra-dense layouts where 0.1mm size reduction matters | Select MAX6422XS44-T only when board space is constrained beyond SOT143 limits |
| TLV809E43DBZR | Fixed 4.3V threshold (±2%), no capacitor-adjustable timeout, 1.8µA IQ, SOT23-3 | Lacks timeout flexibility; suitable only where fixed 200ms delay suffices and 3-pin simplicity is prioritized | Choose TLV809E43DBZR only for cost-sensitive, non-critical applications without timing tuning needs |
Compared with MAX6422XS44-T, the MAX6422US44-T offers identical supervision functionality in a slightly larger but more thermally robust SOT143 package; versus TLV809E43DBZR, it delivers field-tunable reset duration and tighter threshold accuracy at the cost of one extra pin and higher design complexity.
Availability
MAX6422US44-T is available at Aetrix Electronics and suitable for battery-powered controllers, portable medical instruments, and automotive body control modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6422US44-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 demanding industrial, automotive, and medical applications.
The MAX6421–MAX6426 family was engineered specifically for ultra-low-power microprocessor reset supervision in space-constrained, battery-operated systems where accurate voltage thresholding and flexible timeout control are critical.
FAQ
What is the exact reset threshold voltage of MAX6422US44-T?
The MAX6422US44-T has a factory-laser-trimmed nominal reset threshold of 4.375V, with ±1.5% accuracy over temperature (–40°C to +125°C) and ±2.5% over full operating range. This value is confirmed in Table 1 of the datasheet under suffix "44", and applies specifically to the MAX6422US44-T variant.
How do I calculate the reset timeout capacitor for MAX6422US44-T?
Use the formula CSRT = (tRP – 275µs) / 2.73×10⁶, where tRP is desired timeout in seconds and CSRT is in farads. For example, a 2ms timeout requires CSRT = (0.002 – 0.000275) / 2.73×10⁶ ≈ 632pF. The MAX6422US44-T's internal 240nA SRT current source and 0.65V ramp threshold enable this linear relationship.
Does MAX6422US44-T require an external pullup resistor on the RESET pin?
No. The MAX6422US44-T features an active-high push-pull RESET output, meaning it actively drives high and low without external components. Unlike open-drain variants (e.g., MAX6423US44-T), the MAX6422US44-T can directly interface to standard CMOS µP reset inputs without a pullup resistor.
Can MAX6422US44-T operate reliably below 1.6V supply voltage?
Yes. The MAX6422US44-T is specified to function down to VCC = 1.0V, with guaranteed RESET assertion and deassertion validity throughout that range. Its internal circuitry remains fully operational and meets all timing and threshold specifications even at 1.0V, enabling use in deep-brownout scenarios where other supervisors fail.
What is the maximum transient immunity of MAX6422US44-T?
The MAX6422US44-T rejects VCC transients ≤50µs wide when the dip magnitude is ≤100mV below its 4.375V threshold - per the "Maximum Transient Duration vs. Reset Threshold Overdrive" graph in the datasheet. This immunity is inherent to its internal ramp-comparator architecture and does not require external filtering.
MAX6422US44-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- TO-253-4, TO-253AA
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.375V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active High
- Reset Timeout:
- Adjustable/Selectable
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-4
MAX6422US44-T FAQ
1.How can I place an order for MAX6422US44-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6422US44-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 MAX6422US44-T reliable?
The price and inventory of MAX6422US44-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6422US44-T is usually 5 days.
3.What payment methods are accepted for MAX6422US44-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6422US44-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6422US44-T?
MAX6422US44-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6422US44-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 MAX6422US44-T?
For technical support, including MAX6422US44-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6422US44-T requirements.
6.How does Aetrix verify that MAX6422US44-T is sourced from the original manufacturer or authorized distributors?
All MAX6422US44-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 MAX6422US44-T meets industry standards.
7.What is the process for return or replacement of MAX6422US44-T?
All MAX6422US44-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6422US44-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 MAX6422US44-T part is unused and in its original packaging.
Return procedure for MAX6422US44-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX6422US44-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…
