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Analog Devices Inc./Maxim Integrated MAX6340UK32+
- Part No.:
- MAX6340UK32+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6340UK32+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,642
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Product details
Overview
MAX6340UK32+ from Maxim Integrated is a low-power microprocessor supervisor IC that monitors 3.2V system supply rails and asserts an active-low open-drain reset signal when VCC falls below 3.200V (±2.5% over temperature). It features capacitor-adjustable reset timeout (275µs to 5.75ms), guaranteed reset validity down to VCC = 1V, and 1.6µA typical quiescent current. It is used in battery-powered controllers and critical µP monitoring where precise brownout detection and flexible timing are required.
For engineers reviewing the MAX6340UK32+ datasheet, MAX6340UK32+ pinout, MAX6340UK32+ application, or MAX6340UK32+ equivalent, key selection criteria include its 3.2V reset threshold accuracy, SOT23-5 open-drain output configuration, capacitor-set timeout delay, and AEC-Q100 qualification for automotive-grade reliability.
Technical Context
The MAX6340UK32+ implements a precision voltage detector with laser-trimmed internal resistors to set its 3.200V reset threshold, with ±2.5% tolerance across –40°C to +125°C. Its reset assertion logic is triggered by VCC falling below VTH, and deassertion is delayed by a 240nA current source charging an external capacitor (CSRT) to a 0.65V ramp threshold.
This architecture ensures immunity to short VCC transients (e.g., ≤50µs for 100mV overdrive) and supports wired-OR reset configurations via its open-drain output. The device operates continuously from VCC = 1.0V to 5.5V and guarantees valid RESET output down to VCC = 1V - critical for robust power-up sequencing in embedded systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.200V ±2.5% over –40°C to +125°C - ensures reliable brownout detection across automotive and industrial temperature ranges |
| Quiescent Current | 1.6µA typical at VCC ≤ 2.0V - enables multi-year operation in coin-cell–powered portable equipment |
| Reset Timeout Range | 275µs to 5.75ms (with CSRT = 0 to 1500pF) - provides design flexibility for diverse µP reset timing requirements |
| Output Type | Active-low open-drain - allows level-shifting, wired-OR reset combining, and interface with µPs operating at different supply voltages |
| VCC Operating Range | 1.0V to 5.5V - supports wide-input systems including Li-ion, 3.3V, and 5V rails without external regulation |
| Reset Propagation Delay | 80µs max (VCC falling at 1mV/µs) - ensures fast response to supply collapse before µP executes invalid code |
| Supply Voltage Hysteresis | 4 × VTH = 12.8mV - prevents chatter during slow VCC recovery near threshold |
Pinout & Package
MAX6340UK32+ is housed in a RoHS-compliant 5-pin SOT23-5 package (package code U5+2), with 0.95mm pitch, 2.9mm × 1.6mm footprint, and thermal pad omitted. Pin 3 is internally unconnected (N.C.) and must be left floating or tied to GND per layout best practice.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | SRT | Set Reset Timeout input - connects to external capacitor (CSRT) to program reset delay; sensitive to leakage and stray capacitance |
| 2 | GND | Ground reference - return path for internal current sources and reset output sink current |
| 3 | N.C. | Not internally connected - no electrical function; recommended to tie to GND for mechanical stability and EMI reduction |
| 4 | VCC | Supply voltage and monitored rail - powers device and serves as input to precision voltage detector |
| 5 | RESET | Active-low open-drain reset output - requires external pullup (10kΩ–100kΩ) to any logic-compatible voltage up to 5.5V |
Key Features
| Feature | Design Value |
|---|---|
| Capacitor-adjustable reset timeout | Enables precise, application-specific reset hold time (275µs–5.75ms) without firmware or external timers |
| Guaranteed reset validity to VCC = 1V | Ensures deterministic µP reset state even during deep brownout or ultra-low-power wake-up sequences |
| Immunity to short VCC transients | Rejects glitches ≤50µs duration when VCC dips 100mV below threshold - eliminates false resets in noisy environments |
| Open-drain RESET with 1.0µA leakage | Supports multi-voltage system interfacing and wired-OR reset bus architectures with minimal standby current impact |
| AEC-Q100 qualified (MAX6340UK31/V+T variant) | Validated for automotive applications - confirms reliability under temperature cycling, humidity, and vibration stress |
Applications
| Battery-Powered Controllers | Automotive Body Control Modules |
|---|---|
|
Use Scenario: Monitoring 3.2V LiFePO₄ battery rail in remote sensor nodes with 10-year battery life target. IC Role / Device Role / Timing Role: Voltage supervisor asserting open-drain RESET to ARM Cortex-M0+ MCU during brownout, with 4.375ms timeout set by 1500pF capacitor. Use Value: 1.6µA quiescent current minimizes battery drain; open-drain output interfaces directly to 3.3V MCU reset pin without level shifter. |
Use Scenario: Power-on reset generation for infotainment head unit MCU supplied from 3.2V post-regulator rail. IC Role / Device Role / Timing Role: AEC-Q100-aligned supervisor providing glitch-immune reset assertion during cold-crank and load-dump events. Use Value: 80µs propagation delay and ±2.5% threshold accuracy ensure reliable startup across –40°C to +125°C ambient. |
| Medical Infusion Pumps | Industrial PLC I/O Modules |
|
Use Scenario: Ensuring fail-safe reset of safety-critical pump controller during AC/DC adapter undervoltage conditions. IC Role / Device Role / Timing Role: Supervises 3.2V backup rail derived from supercapacitor; asserts RESET until regulated supply stabilizes. Use Value: Valid RESET output down to VCC = 1V prevents undefined MCU state during capacitor discharge phase. |
Use Scenario: Reset coordination across multiple µPs in modular I/O base with shared 3.2V backplane supply. IC Role / Device Role / Timing Role: Open-drain RESET enables wired-OR connection with auxiliary watchdog ICs for redundant reset signaling. Use Value: 10kΩ–100kΩ pullup flexibility allows compatibility with 2.5V, 3.3V, or 5V logic families on same board. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LP3470ASX-32 | Pin-compatible 5-pin SOT23; fixed 3.2V threshold; push-pull output (not open-drain); 1.8µA ICC | Requires redesign of reset pullup network; lacks wired-OR capability; no capacitor-adjustable timeout | Select LP3470ASX-32 only if push-pull drive and fixed 200ms timeout are acceptable and layout change is feasible. |
| NCP302LSN32T1G | 3.2V threshold; open-drain output; fixed 200ms timeout; 0.9µA ICC; SOT23-5 package | No timeout adjustability; lower quiescent current but no capacitor programming; not AEC-Q100 qualified | Choose NCP302LSN32T1G for ultra-low-power, cost-sensitive designs where fixed timeout suffices and automotive qualification is unnecessary. |
Compared with LP3470ASX-32 and NCP302LSN32T1G, the MAX6340UK32+ uniquely combines open-drain output, capacitor-adjustable timeout, and AEC-Q100 alignment - making it optimal for automotive and high-reliability embedded systems requiring design flexibility and robustness.
Availability
MAX6340UK32+ is available at Aetrix Electronics and suitable for battery-powered controllers, automotive body electronics, and medical infusion pumps requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for MAX6340UK32+ 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, automotive, and computing applications.
The MAX6340 series belongs to Maxim's precision voltage supervisor product line, designed specifically for low-power, high-accuracy reset generation in space-constrained and thermally demanding environments.
FAQ
What is the exact reset threshold voltage of the MAX6340UK32+?
The MAX6340UK32+ has a nominal reset threshold of 3.200V, with guaranteed accuracy of ±2.5% over the full operating temperature range (–40°C to +125°C). This value is factory-laser-trimmed and confirmed in the Electrical Characteristics table under VTH parameter with suffix "32" per Table 1 in the datasheet.
Does the MAX6340UK32+ support wired-OR reset functionality?
Yes, the MAX6340UK32+ supports wired-OR reset because its RESET pin is an active-low open-drain output. This allows multiple supervisors (e.g., MAX6340UK32+ and a watchdog IC) to share a single reset bus using a common pullup resistor - a feature explicitly documented in the Applications Information section.
Can the MAX6340UK32+ operate reliably below 1.6V supply voltage?
Yes, the MAX6340UK32+ operates down to VCC = 1.0V and guarantees valid RESET output down to VCC = 1V. Its supply current remains at 1.6µA typical even at VCC ≤ 2.0V, and the reset comparator continues functioning - enabling use in ultra-low-voltage brownout scenarios where other supervisors fail.
What capacitor value sets a 4.375ms reset timeout for the MAX6340UK32+?
A 1500pF capacitor (CSRT) between SRT and GND sets a typical reset timeout of 4.375ms for the MAX6340UK32+, as specified in the Electrical Characteristics table under tRP condition CSRT = 1500pF. The relationship is linear: tRP = (2.73 × 10⁶ × CSRT) + 275µs, with CSRT in farads.
Is the MAX6340UK32+ qualified for automotive applications?
The MAX6340UK32+ itself is not explicitly AEC-Q100 qualified per the datasheet; however, the closely related MAX6340UK31/V+T variant is AEC-Q100 qualified. While MAX6340UK32+ shares identical electrical specs and packaging, automotive deployment should verify qualification status with Maxim/Analog Devices for the specific suffix and date code.
MAX6340UK32+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 3.2V
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- Adjustable/Selectable
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6340UK32+ FAQ
1.How can I place an order for MAX6340UK32+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6340UK32+ 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 MAX6340UK32+ reliable?
The price and inventory of MAX6340UK32+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6340UK32+ is usually 5 days.
3.What payment methods are accepted for MAX6340UK32+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6340UK32+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6340UK32+?
MAX6340UK32+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6340UK32+ 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 MAX6340UK32+?
For technical support, including MAX6340UK32+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6340UK32+ requirements.
6.How does Aetrix verify that MAX6340UK32+ is sourced from the original manufacturer or authorized distributors?
All MAX6340UK32+ 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 MAX6340UK32+ meets industry standards.
7.What is the process for return or replacement of MAX6340UK32+?
All MAX6340UK32+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6340UK32+, 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 MAX6340UK32+ part is unused and in its original packaging.
Return procedure for MAX6340UK32+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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