Analog Devices Inc./Maxim Integrated MAX6737XKSYD3+

Overview

MAX6737XKSYD3+ from Maxim Integrated is a dual fixed-voltage microprocessor supervisor IC with push-pull active-low reset output, manual reset input, and factory-trimmed thresholds of 2.925V (VCC1) and 2.188V (VCC2). It operates from -40°C to +85°C in a 5-pin SC70 package, draws only 6µA supply current, and provides a 150ms minimum reset timeout period. It is used in portable battery-powered systems requiring reliable dual-rail power monitoring and controlled reset assertion.

For engineers reviewing the MAX6737XKSYD3+ datasheet, MAX6737XKSYD3+ pinout, MAX6737XKSYD3+ application, or MAX6737XKSYD3+ equivalent, key selection criteria include its push-pull RESET output (no external pullup required), precise dual-threshold supervision for I/O/core rails, 150ms timeout timing, low quiescent current, and SC70 space-constrained footprint compatibility.

Technical Context

The MAX6737XKSYD3+ integrates two independent voltage comparators with factory-trimmed thresholds (2.925V and 2.188V) referenced to internal precision bandgap references. Reset assertion occurs when either VCC1 or VCC2 falls below its respective threshold, and reset remains asserted for ≥150ms after both supplies recover.

It features an active-low manual reset (MR) input with internal 1.5kΩ pullup to VCC1, MR-to-RESET propagation delay of 300ns, and MR pulse width immunity of 100ns. The push-pull RESET output drives high to ≥0.8×VCC1 at 800µA source current and low to ≤0.4V at 3.2mA sink current.

Key Specifications

Pinout & Package

MAX6737XKSYD3+ uses a 5-pin SC70-5 package with exposed pad (not electrically connected). Pin 1 is RESET (push-pull active-low), Pin 2 is GND, Pin 3 is MR (active-low manual reset), Pin 4 is VCC2 (secondary supply input), and Pin 5 is VCC1 (primary supply input).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-supply supervisory applications.

Compared with MAX6736XKSYD3+, MAX6737XKSYD3+ eliminates the external pullup requirement and simplifies layout; compared with TPS3808G33DBVR, it uniquely supports simultaneous dual-voltage monitoring with matched thresholds and tighter timing control for complex SoC power domains.

Availability

MAX6737XKSYD3+ is available at Aetrix Electronics and suitable for portable/battery-powered equipment, multivoltage systems, and notebook computers requiring stable component supply across industrial temperature ranges and long production lifecycles.

Supply support for MAX6737XKSYD3+ 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 and mixed-signal ICs for power, sensing, and interface applications in industrial, computing, and portable markets.

The MAX6736–MAX6745 family was engineered specifically for low-power dual- and triple-voltage microprocessor supervision in space-constrained, battery-sensitive systems-emphasizing ultra-low ICC, factory-trimmed accuracy, and minimal external components.

FAQ

What is the exact reset threshold voltage for VCC1 on the MAX6737XKSYD3+?

The MAX6737XKSYD3+ has a factory-trimmed VCC1 reset threshold of 2.925V, with a guaranteed tolerance of ±0.075V over the full -40°C to +85°C operating temperature range. This value is confirmed in Table 1 of the datasheet under suffix "SY" and applies directly to the MAX6737XKSYD3+ without adjustment or calibration. The threshold is referenced to an internal precision bandgap, ensuring stability across voltage and temperature.

Does the MAX6737XKSYD3+ require an external pullup resistor on the RESET pin?

No, the MAX6737XKSYD3+ does not require an external pullup resistor on the RESET pin because it features a push-pull output stage. Unlike open-drain variants such as MAX6736XKSYD3+, the MAX6737XKSYD3+ actively drives RESET high to ≥0.8×VCC1 and low to ≤0.4V, eliminating dependency on external components for logic-level translation or bus sharing.

What is the minimum pulse width required on the MR pin to trigger reset on the MAX6737XKSYD3+?

The MAX6737XKSYD3+ requires a minimum MR input pulse width of 1µs to reliably assert reset. This specification is guaranteed across temperature and supply voltage, and the device includes 100ns glitch rejection to prevent spurious resets from noise. After MR returns high, the reset remains asserted for the full 150ms timeout period, independent of MR pulse duration beyond the 1µs minimum.

Can the MAX6737XKSYD3+ monitor a 1.8V core supply?

No, the MAX6737XKSYD3+ cannot reliably monitor a 1.8V core supply because its VCC2 threshold is fixed at 2.188V. Attempting to apply 1.8V to VCC2 would result in continuous reset assertion, as the input remains below threshold. For 1.8V core monitoring, select a variant with suffix "SD" (VCC2 = 0.788V) or "SV" (VCC2 = 1.575V), or consider the MAX6738/MAX6739 series with adjustable RSTIN input.

What is the supply current consumption of the MAX6737XKSYD3+ at 25°C and 3.3V VCC1?

At TA = +25°C and VCC1 = 3.3V (with VCC2 = 2.5V and no reset asserted), the MAX6737XKSYD3+ draws 6µA typical total supply current-comprising ~5µA from VCC1 and ~1µA from VCC2. This ultra-low ICC enables multi-year operation in coin-cell–powered devices and satisfies stringent energy budgets in always-on IoT edge nodes.