Analog Devices Inc./Maxim Integrated MAX6340UK29+T

Overview

MAX6340UK29+T from Analog Devices is a low-power microprocessor supervisor IC with open-drain active-low reset output, 2.925V nominal reset threshold (±2.5% over temperature), capacitor-adjustable reset timeout (275µs to 5.75ms), and guaranteed operation down to VCC = 1V. It monitors supply voltage in battery-powered embedded controllers and ensures reliable µP reset during brownout conditions.

For engineers reviewing the MAX6340UK29+T datasheet, MAX6340UK29+T pinout, MAX6340UK29+T application, or MAX6340UK29+T equivalent, key selection criteria include its SOT23-5 open-drain RESET output, 1.6µA typical quiescent current, ±2.5% reset threshold accuracy across –40°C to +125°C, and compatibility with external pullup voltages up to 5.5V.

Technical Context

The MAX6340UK29+T implements a precision voltage detector with laser-trimmed internal resistors to set its 2.925V reset threshold, and uses a 240nA constant-current source charging an external capacitor on the SRT pin to generate the reset timeout delay. Its open-drain RESET output requires an external pullup resistor and remains valid for VCC ≥ 1V.

It features immunity to short VCC transients (e.g., ≤50µs for 100mV overdrive), guaranteed reset assertion for VCC falling below threshold, and deassertion only after both VCC exceeds threshold and the SRT capacitor ramps to 0.65V. The device operates across –40°C to +125°C and supports logic-level interfacing with µPs powered by supplies independent of VCC.

Key Specifications

Pinout & Package

MAX6340UK29+T is housed in a 5-pin SOT23-5 package (package code U5+2), RoHS-compliant, tape-and-reel format. Pin 1 is SRT (Set Reset Timeout), Pin 2 is GND, Pin 3 is RESET (open-drain), Pin 4 is N.C. (not internally connected), and Pin 5 is VCC.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar microprocessor supervisor applications.

Compared with NCP302LSN29T1G and TLV803EB29DBZR, the MAX6340UK29+T uniquely delivers capacitor-adjustable reset timeout in an open-drain SOT23-5 package with guaranteed 1V operation - making it the only option among the three that supports both flexible timing and deep-brownout reliability in compact industrial designs.

Availability

MAX6340UK29+T is available at Aetrix Electronics and suitable for battery-powered medical sensors, automotive body control modules, and industrial programmable logic controllers requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6340UK29+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

Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets since 1965.

The MAX6340UK29+T belongs to Analog Devices' precision voltage supervisor product line, engineered specifically for robust, low-power reset generation in harsh-environment embedded systems where supply integrity is mission-critical.

FAQ

What is the exact reset threshold voltage of the MAX6340UK29+T and how does it vary with temperature?

The MAX6340UK29+T has a nominal reset threshold of 2.925V, with accuracy of ±1.5% at +25°C and ±2.5% over the full operating range of –40°C to +125°C. This specification is laser-trimmed at wafer test and confirmed in the Electrical Characteristics table; the device uses internal precision resistors to maintain this tolerance without external calibration.

Can the MAX6340UK29+T operate reliably when the supply voltage drops below 1.8V?

Yes - the MAX6340UK29+T is fully specified to operate and assert valid RESET down to VCC = 1.0V, as stated in the Absolute Maximum Ratings and Electrical Characteristics tables. Its internal circuitry remains functional and the open-drain RESET output maintains defined low-state performance (VOL ≤ 0.3V at ISINK = 500µA) even at 1.0V supply.

How do I calculate the external capacitor value needed to achieve a 3.5ms reset timeout with the MAX6340UK29+T?

Use the formula CSRT = (tRP − 275µs) / 2.735 × 10⁶, where tRP is in seconds. For 3.5ms: CSRT = (0.0035 − 0.000275) / 2,735,000 ≈ 1180pF. A standard 1200pF ceramic capacitor (low-leakage, X7R or C0G) meets this requirement and yields ~3.53ms timeout per the Typical Operating Characteristics graph.

Is the NC pin (Pin 4) on the MAX6340UK29+T required to be connected, and if so, to what?

Pin 4 of the MAX6340UK29+T is labeled N.C. (Not Connected) and has no internal connection. It may be left floating or tied to GND for mechanical stability or solderability - Analog Devices explicitly states this in the Pin Description section and confirms no electrical function is associated with this terminal.

Does the MAX6340UK29+T meet AEC-Q100 qualification requirements for automotive use?

The MAX6340UK29+T itself is not AEC-Q100 qualified; however, the related MAX6340UK31/V+T variant is explicitly listed as AEC-Q100 qualified in the datasheet. For automotive applications requiring qualification, designers should select MAX6340UK31/V+T or verify qualification status directly with Analog Devices for specific lot traceability and test reports.