Analog Devices Inc./Maxim Integrated MAX6751KA17/V+T

Overview

MAX6751KA17/V+T from Analog Devices is a low-power microprocessor supervisory IC that monitors dual supply voltages (VCC and external RESET IN), provides capacitor-adjustable reset timeout (5.7–9.5 ms) and watchdog timeout (5.7–9.5 ms normal / 729–1214 ms extended), and features ±2% factory-trimmed 1.665V VCC reset threshold with 0.8% hysteresis - used in automotive engine control units to ensure deterministic μP restart during cold-crank brownout events.

For engineers reviewing the MAX6751KA17/V+T datasheet, MAX6751KA17/V+T pinout, MAX6751KA17/V+T application, or MAX6751KA17/V+T equivalent, key selection criteria include dual-voltage monitoring capability, AEC-Q100 qualification for automotive (-40°C to +125°C), push-pull active-low RESET output, 3.7µA supply current at 2V, and compatibility with external resistor-divider for adjustable RESET IN threshold.

Technical Context

The MAX6751KA17/V+T implements dual-supply supervision: one fixed 1.665V threshold for VCC (±2% over -40°C to +125°C) and one adjustable threshold on RESET IN (1.235V ±0.8%, set via external resistor divider). It supports manual reset via MR input with 1µs minimum pulse width and 100ns glitch rejection.

Its watchdog timer operates in two modes - normal (capacitor-set tWD = 4.94×10⁶ × CSWT) and extended (×128 multiplication via WDS pin) - with timeout periods fully decoupled from reset timeout (tRP = 4.94×10⁶ × CSRT). The device guarantees valid RESET assertion down to VCC = 1V and includes power-supply transient immunity up to 50µs at 100mV overdrive.

Key Specifications

Pinout & Package

MAX6751KA17/V+T is housed in an 8-pin SOT23 package (outline 21-0078, land pattern 90-0176), RoHS-compliant, with 0.65mm pitch and 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 MAX6751KA17/V+T, MAX6750KA17/V+T removes MR functionality while retaining identical supervision accuracy and timing, whereas TLV803EB26DBVR reduces feature set to basic single-rail reset - making MAX6751KA17/V+T the only option supporting dual-rail monitoring, extended watchdog, and manual reset in one AEC-Q100-qualified device.

Availability

MAX6751KA17/V+T is available at Aetrix Electronics and suitable for automotive engine control units, ADAS camera modules, and telematics control units requiring stable component supply with full AEC-Q100 lifecycle support.

Supply support for MAX6751KA17/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 semiconductor leader specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision, power, and reliability-critical applications.

The MAX6746–MAX6753 family was designed specifically for automotive and industrial microprocessor supervision - delivering dual-rail monitoring, capacitor-adjustable timing, and AEC-Q100 qualification in minimal 8-pin SOT23 footprint.

FAQ

What is the factory-trimmed VCC reset threshold voltage for MAX6751KA17/V+T?

The MAX6751KA17/V+T has a factory-trimmed VCC reset threshold of 1.665V with ±2% tolerance over -40°C to +125°C, corresponding to suffix "17" in the ordering code per Table 2 of the datasheet. This value is laser-trimmed during production and does not require external calibration.

Does MAX6751KA17/V+T support monitoring of two independent supply rails simultaneously?

Yes, MAX6751KA17/V+T monitors two rails: VCC using its internal 1.665V threshold and a second rail via the RESET IN pin, which compares against a fixed 1.235V internal reference. When either rail falls below its respective threshold, MAX6751KA17/V+T asserts RESET - enabling full-system power integrity assurance.

How is the watchdog timeout extended by 128× in MAX6751KA17/V+T?

The MAX6751KA17/V+T extends watchdog timeout by 128× when the WDS pin is driven high (to VCC). In this mode, the base timeout (set by CSWT on SWT pin) is multiplied internally - e.g., a 1500pF capacitor yields ~7.6ms normal timeout or ~971ms extended timeout. A state change on WDS clears the watchdog timer.

What is the minimum VCC voltage at which MAX6751KA17/V+T guarantees valid RESET output logic?

MAX6751KA17/V+T guarantees valid RESET output logic (push-pull high/low states) for VCC ≥ 1.0V. Below 1.0V, RESET behavior is not specified; however, the device continues to monitor VCC and will assert RESET if VCC falls below 1.665V - even during deep brownout conditions.

Can MAX6751KA17/V+T be used in systems requiring manual reset initiation via a front-panel button?

Yes, MAX6751KA17/V+T includes a dedicated MR (Manual Reset) input (Pin 1) that accepts a direct switch-to-ground connection. The internal 20kΩ pullup eliminates need for external components, and a 1µs minimum low pulse reliably triggers reset - making it ideal for user-initiated recovery in automotive human-machine interfaces.