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Analog Devices Inc./Maxim Integrated MAX6334UR23D3+T
- Part No.:
- MAX6334UR23D3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MAX6334UR23D3+T.pdf
- Description:
- IC MPU/RESET CIRC 2.30V SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,492
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Product details
Overview
MAX6334UR23D3+T from Maxim Integrated is an ultra-low-voltage, open-drain microprocessor supervisory circuit in a 3-pin SOT23 package. It monitors 1.8V–3.3V power supplies, asserts an active-low reset when VCC falls below 2.30V (±1.8% at +25°C), and holds reset for ≥100ms after VCC recovers-enabling reliable power-on/brownout reset in portable battery-powered systems.
For engineers reviewing the MAX6334UR23D3+T datasheet, MAX6334UR23D3+T pinout, MAX6334UR23D3+T application, or MAX6334UR23D3+T equivalent, key selection criteria include its 1.0V minimum operating voltage, 3.3µA supply current, open-drain output for bidirectional μP reset interfacing (e.g., Motorola 68HC11), and factory-trimmed 2.30V threshold with ±3% variation over –40°C to +125°C.
Technical Context
The MAX6334UR23D3+T implements a precision bandgap-based reset comparator with transient immunity-rejecting negative-going VCC glitches up to 24µs at 10V/ms slew rate. Its open-drain RESET output requires an external pull-up and supports wired-OR configurations with microcontrollers having bidirectional reset pins.
Reset timeout is fixed at ≥100ms (nominal 150ms), guaranteed over full temperature range. The device operates down to VCC = 1.0V (not 0.7V like MAX6332/33), and RESET leakage remains ≤0.5µA when deasserted-critical for low-power retention modes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.30V ±1.8% at +25°C; ±3% over –40°C to +125°C-ensures precise brownout detection for 2.5V systems |
| Reset Timeout Period | ≥100ms (typ. 150ms)-guarantees sufficient processor initialization time after power recovery |
| Supply Voltage Range | 1.0V to 5.5V-supports operation during deep battery discharge without false reset assertion |
| Supply Current | 3.3µA typ. at VCC = 2.5V-minimizes quiescent drain in always-on monitoring circuits |
| RESET Output Type | Open-drain, active-low-enables shared reset bus and interface with bidirectional μP reset pins |
| VOL (RESET asserted) | ≤0.4V at ISINK = 50µA, VCC ≥ 1.0V-ensures solid logic-low level even at ultra-low supply |
| Operating Temperature | –40°C to +125°C-qualified for industrial and automotive under-hood environments |
Pinout & Package
MAX6334UR23D3+T is housed in a RoHS-compliant, lead-free 3-pin SOT23 package (outline 21-0051, land pattern 90-0179), with 1.3mm × 2.9mm footprint and 0.95mm height-optimized for space-constrained portable designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (GND) | Ground reference | Return path for internal comparator and output stage; must be connected directly to system ground plane |
| 2 (RESET) | Open-drain active-low reset output | Drives low during reset; requires external pull-up resistor (typically 10kΩ–100kΩ) to VCC or another rail |
| 3 (VCC) | Power supply input | Monitored supply rail; powers internal circuitry and defines reset threshold reference point |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed 2.30V reset threshold | Eliminates external resistor divider; reduces BOM count and layout sensitivity in 2.5V systems |
| 100ms minimum reset timeout | Meets JEDEC JESD76 requirements for μP initialization timing without external RC timing components |
| 1.0V minimum operating voltage | Enables valid reset assertion down to near-end-of-battery life in coin-cell or Li-ion applications |
| 3.3µA supply current | Extends battery life in always-on supervision-e.g., >10 years on a 220mAh CR2032 cell |
| Transient-immune comparator | Rejects <24µs negative VCC glitches at 10V/ms-prevents spurious resets during switching noise events |
Applications
| Portable Medical Sensors | Industrial PLC I/O Modules |
|---|---|
|
Use Scenario: Battery-powered glucose meters and pulse oximeters requiring continuous power monitoring during intermittent operation. IC Role / Device Role / Timing Role: Supervisory circuit asserting active-low reset to ARM Cortex-M0+ MCU upon battery voltage sag below 2.30V. Use Value: Guarantees clean processor restart before analog front-end corruption; 3.3µA ICC extends single-CR2032 lifetime beyond 5 years. |
Use Scenario: DIN-rail mounted programmable logic controllers with isolated 24V DC inputs and 3.3V logic rails. IC Role / Device Role / Timing Role: Brownout detector for the 3.3V FPGA configuration supply, holding reset until stable post-transient. Use Value: Prevents partial configuration lockup during 24V line surges; 100ms timeout exceeds FPGA boot ROM execution time. |
| Automotive Body Control Units | Smart Energy Meters |
|
Use Scenario: Under-hood BCM modules powered from vehicle battery (9V–16V) with local 3.3V LDO for microcontroller. IC Role / Device Role / Timing Role: Monitors the 3.3V LDO output and asserts open-drain reset to PIC18F MCU during cold-crank voltage dip. Use Value: Operates down to 1.0V VCC-remains functional during 6V cranking dips; open-drain output interfaces safely with MCU's bidirectional reset pin. |
Use Scenario: ANSI C12.20-certified electricity meters with tamper-detection circuitry and real-time clock backup. IC Role / Device Role / Timing Role: Resets meter SoC during AC power loss and subsequent supercapacitor hold-up decay below 2.30V. Use Value: 150ms typical timeout ensures RTC register save completes before power collapse; ±3% threshold stability maintains accuracy across -40°C to +85°C field operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6333UR23D3+T | Push/pull active-low RESET output; valid down to 0.7V VCC | Requires no pull-up resistor; unsuitable for wired-OR or bidirectional reset buses | Select when board-level reset signal integrity demands defined high-state drive and lowest possible VCC operating limit |
| TPS3808G23DBVR | Fixed 2.32V threshold; 200ms timeout; 1.4V min VCC; push/pull output | Higher minimum VCC limits use in ultra-low-voltage brownout scenarios; different pinout (SOT23-5) | Choose when longer timeout and TI-qualified AEC-Q100 Grade 2 support are required, and PCB layout allows 5-pin footprint |
Compared with MAX6334UR23D3+T, MAX6333UR23D3+T offers lower VCC operating margin but eliminates external pull-up needs, while TPS3808G23DBVR provides extended timeout and automotive qualification at the cost of higher minimum supply and non-pin-compatible packaging.
Availability
MAX6334UR23D3+T is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, automotive body control units, and smart energy meters requiring stable component supply across extended temperature and long-lifecycle deployments.
Supply support for MAX6334UR23D3+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, automotive, communications, and computing applications.
The MAX633x family delivers ultra-low-power, factory-trimmed supervisory circuits targeting space- and power-constrained microprocessor systems requiring robust brownout protection without external components.
FAQ
What is the exact reset threshold voltage for MAX6334UR23D3+T, and how does it vary with temperature?
The MAX6334UR23D3+T has a factory-trimmed nominal reset threshold of 2.30V at +25°C, with tolerance of ±1.8%. Over the full operating range of –40°C to +125°C, the threshold shifts to ±3% of nominal-i.e., 2.23V to 2.37V. This variation is fully specified and guaranteed in the datasheet's Electrical Characteristics table, ensuring predictable brownout behavior across industrial temperature extremes.
Does MAX6334UR23D3+T require an external pull-up resistor on the RESET pin, and what value is recommended?
Yes, MAX6334UR23D3+T features an open-drain RESET output and requires an external pull-up resistor. A value between 10kΩ and 100kΩ is recommended-10kΩ ensures fast rise time for short-reset applications, while 100kΩ minimizes current draw in ultra-low-power designs. The pull-up may connect to VCC or another compatible rail, depending on system-level reset logic requirements.
Can MAX6334UR23D3+T operate reliably during cold-crank automotive battery conditions?
Yes, MAX6334UR23D3+T is rated for operation down to VCC = 1.0V and functions across –40°C to +125°C. During cold-crank events where battery voltage dips to ~6V, its local 3.3V LDO supply typically remains above 1.0V-allowing the MAX6334UR23D3+T to assert reset before the microcontroller enters undefined state. Its 24µs glitch rejection further prevents false triggers from starter motor noise.
How does the 100ms reset timeout of MAX6334UR23D3+T compare to typical microprocessor startup requirements?
The MAX6334UR23D3+T guarantees ≥100ms reset assertion, with a typical value of 150ms. This exceeds the power-on reset timing requirements of most ARM Cortex-M, PIC, and 8051 derivatives, which commonly specify 10–100ms minimum reset pulse width. The margin ensures reliable initialization even with slow-ramping supplies or temperature-dependent oscillator start-up delays.
Is MAX6334UR23D3+T pin-compatible with legacy Maxim supervisors like MAX809?
Yes, MAX6334UR23D3+T is explicitly stated as pin-compatible with MAX809/MAX810 and MAX6326/MAX6327/MAX6328 in the datasheet's Features section. All share identical 3-pin SOT23 pinout (VCC, GND, RESET), enabling drop-in replacement in existing layouts-provided the open-drain output behavior and 2.30V threshold align with system requirements.
MAX6334UR23D3+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.2V
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 100ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
MAX6334UR23D3+T FAQ
1.How can I place an order for MAX6334UR23D3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6334UR23D3+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 MAX6334UR23D3+T reliable?
The price and inventory of MAX6334UR23D3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6334UR23D3+T is usually 5 days.
3.What payment methods are accepted for MAX6334UR23D3+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6334UR23D3+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6334UR23D3+T?
MAX6334UR23D3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6334UR23D3+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 MAX6334UR23D3+T?
For technical support, including MAX6334UR23D3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6334UR23D3+T requirements.
6.How does Aetrix verify that MAX6334UR23D3+T is sourced from the original manufacturer or authorized distributors?
All MAX6334UR23D3+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 MAX6334UR23D3+T meets industry standards.
7.What is the process for return or replacement of MAX6334UR23D3+T?
All MAX6334UR23D3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6334UR23D3+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 MAX6334UR23D3+T part is unused and in its original packaging.
Return procedure for MAX6334UR23D3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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