Analog Devices Inc./Maxim Integrated MAX6747KA46/V+T

Overview

MAX6747KA46/V+T from Analog Devices is a low-power automotive-grade microprocessor supervisory circuit with factory-trimmed 4.625V VCC reset threshold (±2%), manual-reset input (MR), push-pull active-low RESET output, and capacitor-adjustable reset timeout (tRP) and watchdog timeout (tWD). It monitors single-supply VCC (1.2V–5.5V), asserts reset on brownout or MR activation, and provides transient-immune operation for engine control units and ADAS modules.

For engineers reviewing the MAX6747KA46/V+T datasheet, MAX6747KA46/V+T pinout, MAX6747KA46/V+T application, or MAX6747KA46/V+T equivalent, this page delivers verified specifications, automotive-qualified timing behavior, SOT23-8 pin mapping, dual-capacitor configuration guidance (CSRT/CSWT), and validated alternatives for μP reset and watchdog supervision in safety-critical embedded systems.

Technical Context

The MAX6747KA46/V+T implements a fixed-threshold VCC monitor with ±2% accuracy over −40°C to +125°C, a dedicated manual-reset input (MR) with internal 12–28kΩ pullup and 100ns glitch rejection, and independent capacitor-programmable reset (tRP = 4.94×10⁶ × CSRT) and watchdog (tWD = 4.94×10⁶ × CSWT) timeout periods. It features power-supply transient immunity up to 50µs at 100mV overdrive and guarantees valid RESET assertion down to VCC ≥ 1V.

Unlike windowed watchdog variants (MAX6752/MAX6753), the MAX6747KA46/V+T uses a standard watchdog timer with normal/extended mode selection via WDS pin (128× multiplier), and lacks SET0/SET1 pins-confirming its identity as a MAX6747 variant per pin configuration table and selector guide.

Key Specifications

Pinout & Package

MAX6747KA46/V+T is housed in an 8-pin SOT23 package (Outline 21-0078, Land Pattern 90-0176), RoHS-compliant, with thermal resistance θJA = 196°C/W on four-layer board.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6746KA46/V+T, the MAX6747KA46/V+T adds integrated MR for direct switch interfacing, eliminating external components; versus TLV803EA46DBZR, it delivers full watchdog supervision and automotive temperature range - making it the only option supporting both functional safety timing checks and field-service reset in compact SOT23-8.

Availability

MAX6747KA46/V+T is available at Aetrix Electronics and suitable for automotive engine control, ADAS domain controllers, infotainment head units, and telematics modules requiring stable component supply across extended temperature and long product lifecycles.

Supply support for MAX6747KA46/V+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 automotive, industrial, communications, and healthcare markets.

The MAX6746–MAX6753 family was designed specifically for automotive and industrial microprocessor supervision, delivering AEC-Q100-qualified, low-quiescent-current reset and watchdog functionality in space-constrained SOT23 packages.

FAQ

What is the factory-trimmed reset threshold voltage of the MAX6747KA46/V+T?

The MAX6747KA46/V+T has a factory-trimmed VCC reset threshold of 4.625V with ±2% tolerance over −40°C to +125°C, as confirmed by Table 2 (suffix "46") and Electrical Characteristics section. This value is laser-trimmed during production and does not require external resistor networks - ensuring precision without calibration overhead in the MAX6747KA46/V+T design.

Does the MAX6747KA46/V+T support watchdog timer extension, and how is it configured?

Yes, the MAX6747KA46/V+T supports watchdog timeout extension via the WDS pin: connecting WDS to GND selects normal mode (tWD = 4.94×10⁶ × CSWT), while connecting WDS to VCC multiplies the timeout by 128×. This behavior is documented in the Pin Descriptions and Typical Operating Circuit sections, and applies exclusively to MAX6746–MAX6751 variants like the MAX6747KA46/V+T.

What is the minimum supply voltage at which the MAX6747KA46/V+T guarantees valid RESET output?

The MAX6747KA46/V+T guarantees correct RESET logic state for VCC ≥ 1.0V, as stated in the Absolute Maximum Ratings and Detailed Description sections. Below 1V, RESET may become indeterminate - however, the device remains functional down to VCC = 1.2V (min operating voltage), and the push-pull output ensures robust drive strength across its full operating range.

Can the MAX6747KA46/V+T monitor an external voltage using the RESET IN pin?

No - the MAX6747KA46/V+T does not include a RESET IN pin. Per the Selector Guide and Pin Configurations table, only MAX6748–MAX6751 and MAX6752/MAX6753 variants feature RESET IN or adjustable threshold inputs. The MAX6747KA46/V+T is a fixed-VCC-threshold device with MR, WDS, SWT, SRT, WDI, RESET, GND, and VCC pins only.

Is the MAX6747KA46/V+T AEC-Q100 qualified, and what grade does it meet?

Yes, the MAX6747KA46/V+T is AEC-Q100 qualified per the Benefits and Features section, specifically meeting Grade 0 requirements (−40°C to +125°C ambient operating temperature). This qualification is integral to its automotive suitability and is reflected in the device's full temperature-range electrical specifications and packaging (SOT23 with qualified moisture sensitivity level).