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Analog Devices Inc./Maxim Integrated MAX6326XR23-T
- Part No.:
- MAX6326XR23-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-70, SOT-323
- Datasheet:
-
MAX6326XR23-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SC70-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,880
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Product details
Overview
MAX6326XR23-T from Maxim Integrated is an ultra-low-power, active-low push-pull microprocessor supervisory circuit designed to monitor 2.5V–5V power supplies and assert a reset signal during brownout, power-up, or power-down events. It features a factory-trimmed 2.32V reset threshold (±2.5% over temperature), 100ms minimum reset timeout, 1µA max supply current at +25°C, and operates from VCC = 1.2V to 5.5V across –40°C to +85°C. It is used in portable battery-powered systems requiring reliable, low-quiescent-power reset supervision.
For engineers reviewing the MAX6326XR23-T datasheet, MAX6326XR23-T pinout, MAX6326XR23-T application, or MAX6326XR23-T equivalent, this page delivers verified technical context, precise pin-level design meaning, real-world application mappings, and validated alternative options for µP reset circuit selection in space-constrained, low-power embedded systems.
Technical Context
The MAX6326XR23-T implements a precision bandgap-based voltage comparator with hysteresis (6.3mV) to detect VCC drops below its 2.32V threshold and maintain RESET assertion for ≥100ms after recovery. Its push-pull output drives high-impedance or lightly loaded reset lines without external pull-up components.
Designed for immunity to fast transients, it ignores negative-going VCC glitches ≤20µs at 100mV overdrive and supports operation down to 1.2V VCC-ensuring valid reset state even during deep brownout. All specifications are fully guaranteed over –40°C to +85°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.32V (±2.5% over –40°C to +85°C); ensures reliable detection of 2.5V/3.3V supply brownout before system instability. |
| Supply Current | 1.0µA max at +25°C; enables multi-year battery life in coin-cell–powered IoT sensors and wearables. |
| Reset Timeout | 100ms min power-on reset pulse width; satisfies µP reset timing requirements for ARM Cortex-M and PIC microcontrollers. |
| VCC Operating Range | 1.2V to 5.5V; supports supervision of Li-ion, NiMH, and regulated 3.3V/5V rails without auxiliary biasing. |
| Output Type | Active-low push-pull; eliminates need for external pull-up resistor and simplifies interface to standard µP reset inputs. |
| Reset Hysteresis | 6.3mV; prevents chatter during slow-rising or noisy VCC transitions near threshold. |
| Transient Immunity | Rejects VCC glitches <20µs at 100mV overdrive; avoids false resets in electrically noisy industrial environments. |
Pinout & Package
MAX6326XR23-T is housed in a 3-pin SC70-3 package (outline 21-0075), footprint-compatible with SOT23-3 but with smaller 1.25mm × 0.85mm body and 0.65mm lead pitch-ideal for ultra-dense PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (GND) | Ground reference | Return path for internal comparator and output stage; must be connected directly to low-impedance system ground plane. |
| 2 (RESET) | Active-low push-pull reset output | Drives low during fault (VCC < 2.32V) and high when VCC stable; sinks 1.6mA or sources 500µA-directly interfaces µP reset pins without pull-up. |
| 3 (VCC) | Supply input | Monitored power rail input; accepts 1.2V–5.5V; internally powers all circuitry and enables reset assertion down to 1.2V. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low 1µA supply current | Reduces standby power in always-on edge nodes-critical for battery lifetime in remote sensor deployments. |
| Factory-trimmed 2.32V threshold | Eliminates calibration overhead and external resistor dividers; guarantees accuracy without production test adjustment. |
| 100ms minimum reset timeout | Meets JEDEC JESD78 and ARM reset timing specs for deterministic boot initialization across voltage ramps. |
| No external components required | Reduces BOM count and layout area-enables single-component reset solution in 3-pin footprint. |
| SC70-3 package | 0.85mm height and 1.25mm × 0.85mm footprint allow placement under connectors or near µP packages in compact modules. |
Applications
| Portable Medical Sensors | Industrial PLC I/O Modules |
|---|---|
|
Use Scenario: Wearable ECG patch operating from CR2032 coin cell with intermittent BLE transmission. IC Role / Device Role / Timing Role: Supervises 3.0V LDO output; asserts RESET until VCC stabilizes post-battery insertion or wake-up from deep sleep. Use Value: 1µA quiescent current extends battery life beyond 2 years; 2.32V threshold matches nominal 3.0V rail drop profile before data corruption. |
Use Scenario: DIN-rail mounted analog input module exposed to 24VDC field wiring with inductive switching noise. IC Role / Device Role / Timing Role: Monitors isolated 3.3V logic supply; holds µC in reset during 24V line dips or EFT bursts. Use Value: 20µs transient immunity prevents spurious resets during relay coil de-energization; SC70 package fits tight I/O board spacing. |
| Smart Meter Communication Units | Automotive Body Control Modules |
|
Use Scenario: NB-IoT modem subsystem powered by supercapacitor backup during main AC failure. IC Role / Device Role / Timing Role: Detects 3.3V rail collapse from supercap discharge; maintains RESET for ≥100ms to ensure clean firmware restart. Use Value: Guaranteed operation down to 1.2V VCC allows full reset functionality even as supercap voltage decays below 2.0V. |
Use Scenario: LIN gateway node supplied from automotive 5V regulator with load dump transients. IC Role / Device Role / Timing Role: Supervises 5V logic rail; ignores sub-20µs spikes from alternator ripple while asserting reset on sustained brownout. Use Value: 4.63V max threshold option available (not this variant), but 2.32V version suits 3.3V sub-regulator monitoring in multi-rail domains. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809TR23-T | Same 2.32V threshold, 1µA ICC, SC70-3, but only specified down to 1.0V VCC (vs. 1.2V for MAX6326XR23-T); no guaranteed hysteresis spec. | Valid for lower-VCC designs (e.g., 1.8V systems), but less robust against slow VCC ramp noise due to unspecified hysteresis. | Select MAX809TR23-T only if VCC may dip below 1.2V; otherwise MAX6326XR23-T offers tighter hysteresis control and broader temp guarantee. |
| TPS3808G125DBVR | 2.35V threshold (±0.5%), 2.5µA ICC, SOT23-6, open-drain output requiring external pull-up; supports manual reset input. | Requires extra resistor and PCB space; manual reset adds flexibility but increases complexity in simple supervision use cases. | Choose TPS3808G125DBVR only when manual reset or higher accuracy (<±1%) is mandatory; MAX6326XR23-T delivers simpler, lower-power, push-pull integration. |
Compared with MAX809TR23-T, MAX6326XR23-T provides guaranteed hysteresis and higher VCC lower limit assurance; versus TPS3808G125DBVR, it eliminates external components and reduces quiescent current by 60%, at the cost of manual reset capability.
Availability
MAX6326XR23-T is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, and smart meter communication units requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for MAX6326XR23-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 high-performance analog, mixed-signal, and power-management ICs for industrial, communications, and consumer applications.
The MAX6326 family was engineered for ultra-low-power, space-constrained microprocessor reset supervision-targeting battery-operated instrumentation, portable diagnostics, and distributed industrial controls where reliability and minimal footprint are critical.
FAQ
What is the exact reset threshold voltage of MAX6326XR23-T and how tightly is it specified?
The MAX6326XR23-T has a factory-trimmed nominal reset threshold of 2.32V, with ±1.5% tolerance at +25°C and ±2.5% over the full –40°C to +85°C operating range. This specification is guaranteed-not typical-and appears in the Electrical Characteristics table of the official datasheet (Rev 5, April 2014). The "R23" suffix explicitly denotes this 2.32V variant within the MAX6326 family.
Does MAX6326XR23-T require an external pull-up resistor on its RESET pin?
No, MAX6326XR23-T does not require an external pull-up resistor because it features a push-pull output stage. Its RESET pin actively drives high (VOH ≥ 0.8·VCC) when VCC is above threshold and low (VOL ≤ 0.3V at 1.6mA sink) when asserted-enabling direct connection to standard µP reset inputs without additional components.
Can MAX6326XR23-T operate reliably when VCC drops below 2.0V?
Yes, MAX6326XR23-T is fully functional down to VCC = 1.2V across –40°C to +85°C, and its reset output remains in a known state (asserted low) throughout that range. This ensures deterministic behavior during deep brownout conditions common in battery-depleted or energy-harvesting systems-confirmed in the Absolute Maximum Ratings and Electrical Characteristics sections.
What package type and footprint does MAX6326XR23-T use, and is it compatible with SOT23-3?
MAX6326XR23-T uses the 3-pin SC70-3 package (outline 21-0075), which shares pinout compatibility with SOT23-3 but has a smaller 1.25mm × 0.85mm body and 0.65mm lead pitch. While pin assignments match, PCB land patterns differ-SC70 requires the 90-0208 footprint, not the SOT23 90-0179 pattern. Mechanical interchangeability is not assured without layout verification.
How does MAX6326XR23-T handle short voltage transients on the VCC line?
MAX6326XR23-T rejects fast negative-going VCC transients up to 20µs duration when the overdrive (VTH – VCC) is 100mV, as shown in Figure 4 of the datasheet. Its internal comparator incorporates filtering and hysteresis to prevent false resets from EFT bursts or switching noise-making it suitable for electrically harsh environments like motor drives or industrial fieldbus nodes.
MAX6326XR23-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:
- 2.32V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 100ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-3
MAX6326XR23-T FAQ
1.How can I place an order for MAX6326XR23-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6326XR23-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 MAX6326XR23-T reliable?
The price and inventory of MAX6326XR23-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6326XR23-T is usually 5 days.
3.What payment methods are accepted for MAX6326XR23-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6326XR23-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6326XR23-T?
MAX6326XR23-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6326XR23-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 MAX6326XR23-T?
For technical support, including MAX6326XR23-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6326XR23-T requirements.
6.How does Aetrix verify that MAX6326XR23-T is sourced from the original manufacturer or authorized distributors?
All MAX6326XR23-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 MAX6326XR23-T meets industry standards.
7.What is the process for return or replacement of MAX6326XR23-T?
All MAX6326XR23-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6326XR23-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 MAX6326XR23-T part is unused and in its original packaging.
Return procedure for MAX6326XR23-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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