Analog Devices Inc./Maxim Integrated MAX6737XKZGD3+

Overview

The MAX6737XKZGD3+ from Maxim Integrated is a dual fixed-voltage microprocessor supervisor IC with push-pull active-low RESET output, manual reset input (MR), and factory-trimmed thresholds of 2.925V (VCC1) and 2.188V (VCC2). It asserts reset when either supply falls below its threshold, maintains reset for ≥150ms after recovery, and draws only 6µA supply current. It is used in portable multivoltage systems such as GPS equipment and PDAs to ensure reliable power-on initialization and brownout protection.

For engineers reviewing the MAX6737XKZGD3+ datasheet, MAX6737XKZGD3+ pinout, MAX6737XKZGD3+ application, or MAX6737XKZGD3+ equivalent, key selection criteria include confirmed dual-supply monitoring capability, push-pull RESET drive strength (VOH ≥ 0.8×VCC1 at 800µA), MR timeout period (150–300ms), SC70-5 package compatibility, and guaranteed operation from -40°C to +85°C.

Technical Context

The MAX6737XKZGD3+ implements two independent voltage comparators with precision internal references (VTH1 = 2.925V, VTH2 = 2.188V) and hysteresis of 0.5% of threshold. Its reset logic uses a digital timeout counter that restarts on any threshold violation before completion, ensuring robust immunity to supply transients.

It features an internal 1.5kΩ pullup on MR and a push-pull RESET output referenced to VCC1, eliminating external pullup requirements. The device operates across VCC1/VCC2 ranges of 1.0–5.5V and 0.9–3.3V respectively, with valid reset assertion guaranteed while either supply exceeds 1.2V.

Key Specifications

Pinout & Package

MAX6737XKZGD3+ is housed in a 5-pin SC70-5 package (2.0mm × 1.25mm × 0.95mm, 0.65mm pitch), optimized for space-constrained portable designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6736XKZGD3+, the MAX6737XKZGD3+ saves board space and BOM cost by integrating the RESET pullup, while TPS3808G33DBVR offers lower current but lacks dual-supply capability-making MAX6737XKZGD3+ the only drop-in solution for existing dual-rail layouts requiring push-pull drive.

Availability

MAX6737XKZGD3+ is available at Aetrix Electronics and suitable for GPS tracking devices, industrial handheld terminals, medical point-of-care sensors, and smart meter communication modules requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6737XKZGD3+ 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 connectivity in demanding industrial, medical, and portable applications.

The MAX6736–MAX6745 family was engineered specifically for space- and power-constrained multivoltage systems requiring dual/triple supply monitoring with minimal external components and guaranteed reset timing.

FAQ

What is the exact reset threshold voltage for VCC1 and VCC2 on the MAX6737XKZGD3+?

The MAX6737XKZGD3+ has factory-trimmed reset thresholds of 2.925V for VCC1 and 2.188V for VCC2, as indicated by the "ZG" suffix per Maxim's Table 1. These values are specified over -40°C to +85°C with ±2.5% tolerance and include 0.5% hysteresis to prevent chatter during slow supply ramps. Both thresholds are laser-trimmed during production and do not require external calibration.

Does the MAX6737XKZGD3+ require an external pullup resistor on the RESET pin?

No, the MAX6737XKZGD3+ does not require an external pullup resistor on the RESET pin because it features a push-pull output stage. Unlike open-drain variants (e.g., MAX6736), this version actively drives high (VOH ≥ 0.8×VCC1 at 800µA) and low (VOL ≤ 0.4V at 3.2mA), enabling direct connection to microprocessor reset inputs without additional components.

What is the minimum pulse width required on the MR pin to trigger reset on the MAX6737XKZGD3+?

The MAX6737XKZGD3+ requires a minimum MR input pulse width of 1µs to reliably assert RESET. This specification is guaranteed across -40°C to +85°C and allows compatibility with fast-switching logic families and mechanical pushbutton debouncing circuits. The internal MR debounce is not applied-the 1µs minimum ensures noise immunity while supporting high-speed digital reset initiation.

Can the MAX6737XKZGD3+ monitor a 1.8V core supply?

Yes, the MAX6737XKZGD3+ can monitor a 1.8V core supply on its VCC2 pin, as its VCC2 input range is specified from 0.9V to 3.3V and its factory-trimmed VCC2 threshold is 2.188V. However, since 1.8V is below that threshold, the device will assert RESET continuously. To supervise a true 1.8V rail, a different variant (e.g., MAX6737XKSD3+ with VCC2 = 1.665V) must be selected per Maxim's suffix guide.

Is the MAX6737XKZGD3+ RoHS-compliant and halogen-free?

Yes, the MAX6737XKZGD3+ is RoHS-compliant and halogen-free. The "+" suffix in the part number explicitly denotes lead-free (Pb-free) packaging per Maxim's ordering convention. The device meets JEDEC J-STD-020 moisture sensitivity level 1 (MSL-1) and is qualified to IPC/JEDEC J-STD-002B solderability standards for lead-free reflow processes.