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Analog Devices Inc./Maxim Integrated MXD1811XR44+T
- Part No.:
- MXD1811XR44+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-70, SOT-323
- Datasheet:
-
MXD1811XR44+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SC70-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,960
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Product details
Overview
MXD1811XR44+T from Maxim Integrated is an open-drain, active-low microprocessor reset supervisor IC designed for +5V systems, featuring a factory-set 4.37V reset threshold, 100ms minimum reset timeout, internal 5.5kΩ pullup resistor, and operation down to VCC = +1V. It monitors supply voltage integrity and asserts reset during brownout or power-up conditions in embedded controllers and portable equipment.
For engineers reviewing the MXD1811XR44+T datasheet, MXD1811XR44+T pinout, MXD1811XR44+T application, or MXD1811XR44+T equivalent, key selection criteria include reset threshold accuracy (±2.5%), low quiescent current (4µA), SC70-3 package compatibility, and absence of manual-reset debouncing - distinguishing it from MXD1813/MXD1818 variants.
Technical Context
This device implements a precision bandgap-based voltage comparator with hysteresis to detect VCC falling below 4.37V (min 4.25V, max 4.49V), triggering an open-drain RESET output that remains asserted for ≥100ms after VCC recovers above threshold. The internal pullup ensures logic-high state when reset is inactive.
No manual-reset input functionality is present - unlike MXD1813/MXD1818 - and the device lacks push-button debounce circuitry. Its BiCMOS process enables stable operation across -40°C to +105°C with transient immunity up to 100µs at 100mV overdrive.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.37V (factory-trimmed, ±2.5% over temperature) - ensures reliable detection before critical logic fails in +5V systems |
| Reset Timeout Period | 100ms minimum - guarantees sufficient hold time for μP initialization and memory stabilization |
| Supply Current | 4µA typical at +3.6V - enables use in battery-powered applications without significant drain |
| Operating Voltage Range | +1.0V to +5.5V - supports valid reset assertion even during deep brownout down to 1V |
| Output Type | Open-drain, active-low - allows wired-OR configuration and direct interface with bidirectional μP reset pins |
| Internal Pullup Resistor | 5.5kΩ nominal - eliminates need for external pullup while maintaining fast rise time (~10ns with 10pF load) |
| Package | 3-pin SC70 - 2.0mm × 1.25mm footprint ideal for space-constrained portable designs |
Pinout & Package
MXD1811XR44+T is housed in a 3-pin SC70 package (outline X3-2, land pattern 90-0208), with pin 1 as RESET (open-drain active-low), pin 2 as VCC (supply and threshold monitor input), and pin 3 as GND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (RESET) | Open-drain active-low reset output | Drives low during fault; floats high via internal 5.5kΩ pullup - compatible with bidirectional μP reset inputs without external components |
| 2 (VCC) | Power supply input and reset threshold reference | Monitors system rail directly; comparator operates down to +1V, enabling early-failure detection before logic corruption |
| 3 (GND) | Ground reference | Common return path for internal comparator and output stage; requires low-impedance connection to maintain threshold accuracy |
Key Features
| Feature | Design Value |
|---|---|
| Precision reset threshold | 4.37V ±2.5% over -40°C to +105°C - eliminates calibration and supports robust 5V system margining |
| No external components required | Integrated pullup, comparator, and timer - reduces BOM count and PCB area vs. discrete reset solutions |
| Low-power operation | 4µA typical ICC - extends battery life in portable instrumentation and handheld devices |
| VCC monitoring down to +1V | Guaranteed RESET validity to VCC = +1V - ensures deterministic behavior during severe brownout recovery |
| Transient immunity | Rejects VCC glitches ≤100µs at 100mV overdrive - prevents spurious resets in noisy industrial environments |
Applications
| Industrial Controllers | Portable Medical Devices |
|---|---|
Use Scenario: Monitoring 5V power rails in PLC I/O modules subject to intermittent supply dips during relay switching. IC Role / Device Role / Timing Role: Active-low reset supervisor asserting signal when VCC drops below 4.37V, holding reset for ≥100ms post-recovery to prevent firmware lockup. Use Value: Eliminates need for external RC timing network while ensuring deterministic restart after brownout events common in factory-floor power distribution. |
Use Scenario: Power sequencing in handheld glucose meters powered by single-cell Li-ion batteries with 4.2V–3.0V discharge profile. IC Role / Device Role / Timing Role: Open-drain RESET output interfaces directly with bidirectional reset pin of ARM Cortex-M0 MCU, pulling low only during undervoltage. Use Value: Internal 5.5kΩ pullup removes external component, saving board space and reducing assembly cost in compact Class II medical devices. |
| Network Edge Routers | Smart Energy Meters |
Use Scenario: Ensuring clean boot of MIPS-based control processor during AC/DC converter startup transients. IC Role / Device Role / Timing Role: Voltage supervisor detecting 5V rail instability caused by inrush current, asserting reset until rail stabilizes above 4.37V for ≥100ms. Use Value: ±2.5% threshold accuracy prevents premature release during marginal 5V regulation, avoiding boot failures in telecom infrastructure. |
Use Scenario: Supervising auxiliary 5V supply derived from mains transformer in DIN-rail mounted electricity meters. IC Role / Device Role / Timing Role: Reset generator maintaining low state during brownout induced by lightning-induced surges on distribution lines. Use Value: SC70-3 package enables placement near power entry point; 4µA ICC minimizes standby consumption in always-on utility metering applications. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809TRD3+T | 4.63V reset threshold, SOT23-3 package, no internal pullup - requires external 100kΩ pullup resistor | Suitable for legacy 5V systems where tighter 4.63V trip point improves noise margin but increases risk of false reset during nominal ripple | Select when higher threshold tolerance is needed and board layout accommodates external pullup |
| TPS3808G33DBVR | 3.3V reset threshold, adjustable delay (200ms default), 1.5µA ICC, SOT23-6 - larger footprint and different voltage range | Designed for 3.3V domains; incompatible with 5V systems requiring 4.37V trip point like MXD1811XR44+T | Choose only for new 3.3V designs needing ultra-low power; not a functional substitute for MXD1811XR44+T in 5V applications |
Compared with MAX809TRD3+T and TPS3808G33DBVR, MXD1811XR44+T uniquely combines 4.37V precision threshold, integrated pullup, SC70-3 footprint, and 4µA supply current - making it optimal for space- and power-constrained 5V embedded systems where exact trip voltage and minimal BOM are critical.
Availability
MXD1811XR44+T is available at Aetrix Electronics and suitable for industrial controllers, portable medical devices, and smart energy meters requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MXD1811XR44+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) is a semiconductor company specializing in analog, mixed-signal, and power management ICs for industrial, communications, and consumer applications.
The MXD1810–MXD1818 family was designed specifically for low-power, space-efficient microprocessor reset supervision in portable and embedded systems operating from 2.5V to 5V rails.
FAQ
What is the reset threshold voltage of MXD1811XR44+T and how accurate is it over temperature?
The MXD1811XR44+T has a factory-set reset threshold of 4.37V, with guaranteed accuracy of ±2.5% across the full operating temperature range of -40°C to +105°C. This specification ensures reliable detection of 5V supply faults without false triggering due to thermal drift, and is validated per Maxim's production test limits - not just typical values.
Does MXD1811XR44+T support manual reset via an external pushbutton?
No, MXD1811XR44+T does not include manual-reset debounce functionality. That feature is exclusive to MXD1813/MXD1818 variants. The MXD1811XR44+T provides only power-supply monitoring and automatic reset assertion - external pushbutton reset would require additional circuitry such as a separate debounced switch input.
What package type and pinout does MXD1811XR44+T use?
MXD1811XR44+T uses the 3-pin SC70 package (outline X3-2), with pin 1 as open-drain RESET, pin 2 as VCC, and pin 3 as GND. This matches the pinout of other SC70-based reset supervisors like MAX809 series, enabling drop-in replacement in layouts designed for that footprint - though electrical characteristics differ.
Can MXD1811XR44+T operate with supply voltages below 2.5V?
Yes, MXD1811XR44+T is fully specified to operate down to VCC = +1.0V, and its RESET output remains valid (i.e., correctly asserted or deasserted) at that level. However, the 4.37V threshold means it will assert reset continuously below ~4.25V - so sub-2.5V operation is only meaningful during brownout recovery or for validating reset behavior under extreme undervoltage.
Is an external pullup resistor required for MXD1811XR44+T's RESET output?
No, MXD1811XR44+T includes an internal 5.5kΩ pullup resistor to VCC, eliminating the need for an external component. This simplifies design, saves PCB area, and ensures consistent rise time - especially beneficial when interfacing with bidirectional μP reset pins like those found in older 8-bit microcontrollers.
MXD1811XR44+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-70, SOT-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.37V
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 100ms Minimum
- Operating Temperature:
- -40°C ~ 105°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-3
MXD1811XR44+T FAQ
1.How can I place an order for MXD1811XR44+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MXD1811XR44+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 MXD1811XR44+T reliable?
The price and inventory of MXD1811XR44+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MXD1811XR44+T is usually 5 days.
3.What payment methods are accepted for MXD1811XR44+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MXD1811XR44+T transactions.
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4.How is shipping managed for MXD1811XR44+T?
MXD1811XR44+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MXD1811XR44+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 MXD1811XR44+T?
For technical support, including MXD1811XR44+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MXD1811XR44+T requirements.
6.How does Aetrix verify that MXD1811XR44+T is sourced from the original manufacturer or authorized distributors?
All MXD1811XR44+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 MXD1811XR44+T meets industry standards.
7.What is the process for return or replacement of MXD1811XR44+T?
All MXD1811XR44+T units undergo pre-shipment inspection (PSI). If there is an issue with MXD1811XR44+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 MXD1811XR44+T part is unused and in its original packaging.
Return procedure for MXD1811XR44+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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MIC826SYMT-TR
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