Analog Devices Inc./Maxim Integrated MAX6737XKTGD3

Overview

MAX6737XKTGD3 from Maxim Integrated is a dual fixed-voltage microprocessor supervisor IC with push-pull active-low RESET output, manual reset (MR) input, and factory-trimmed thresholds for VCC1 = 3.075V and VCC2 = 2.313V. It asserts reset when either supply falls below its threshold, maintains reset for ≥150ms after recovery, draws only 6µA supply current, and operates from -40°C to +85°C in portable power management systems.

For engineers reviewing the MAX6737XKTGD3 datasheet, MAX6737XKTGD3 pinout, MAX6737XKTGD3 application, or MAX6737XKTGD3 equivalent, this page delivers verified electrical specs, SC70-5 pin mapping, dual-supply sequencing use cases, and validated alternative parts - all confirmed against Maxim's official datasheet (19-2531 Rev 2).

Technical Context

The MAX6737XKTGD3 integrates two independent voltage comparators with precision internal references (4.625V/3.075V, 3.075V/2.313V, etc., per suffix), each feeding a shared reset timeout timer. Its push-pull RESET output eliminates external pull-up requirements and ensures fast, rail-to-rail deassertion without contention on bidirectional µP reset pins.

It features an internal 1.5kΩ MR pull-up to VCC1, guarantees valid RESET state down to VCC1 = 1.2V, and provides glitch immunity via built-in hysteresis (0.5%) and transient rejection curves validated across temperature. The device uses BiCMOS process (249 transistors) for low leakage and stable threshold drift.

Key Specifications

Pinout & Package

MAX6737XKTGD3 is housed in a 5-pin SC70-5 package (1.6mm × 1.6mm × 0.9mm height), optimized for space-constrained portable designs. 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 monitor), and Pin 5 is VCC1 (primary supply monitor).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-voltage supervisor applications.

Compared with MAX6737XKTGD3, MAX6736XKTGD3 adds design flexibility for bidirectional reset interfaces but increases BOM count and layout complexity, while TPS3808G33DBVR reduces cost and power for single-rail use but cannot replace dual-supply supervision in multivoltage SoC systems.

Availability

MAX6737XKTGD3 is available at Aetrix Electronics and suitable for portable equipment, multivoltage systems, and industrial controllers requiring stable component supply with guaranteed long-term availability and lead-free compliance.

Supply support for MAX6737XKTGD3 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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, computing, and consumer applications.

The MAX6736–MAX6745 family was designed specifically for low-power dual-/triple-voltage microprocessor supervision in space- and energy-constrained systems such as wearables, medical sensors, and portable instrumentation.

FAQ

What is the exact reset threshold voltage for VCC1 and VCC2 on MAX6737XKTGD3?

The MAX6737XKTGD3 has factory-trimmed reset thresholds of 3.075V for VCC1 and 2.313V for VCC2, as defined by the "TG" suffix per Maxim's Table 1. These values are guaranteed over -40°C to +85°C with ±2.5% tolerance and enable precise supervision of standard 3.3V I/O and 2.3V–2.5V core rails. The D3 suffix specifies a 150ms minimum reset timeout period.

Does MAX6737XKTGD3 require an external pull-up resistor on the RESET pin?

No, MAX6737XKTGD3 does not require an external pull-up resistor because it features a push-pull RESET output. This architecture actively drives high (VOH ≥ 0.8×VCC1) and low (VOL ≤ 0.4V) states, eliminating reliance on external components and ensuring robust reset signaling into µP reset pins - unlike open-drain variants such as MAX6736XKTGD3.

Can MAX6737XKTGD3 monitor a 1.8V supply?

No, MAX6737XKTGD3 cannot directly monitor a 1.8V supply because its factory-trimmed VCC2 threshold is fixed at 2.313V. To supervise a 1.8V rail, select a variant with matching suffix (e.g., "SD" = 2.925V/0.788V) or use the adjustable RSTIN input on MAX6738/MAX6739 - but MAX6737XKTGD3 lacks RSTIN and supports only fixed dual-threshold monitoring.

What is the function of the MR pin on MAX6737XKTGD3?

The MR (Manual Reset) pin on MAX6737XKTGD3 is an active-low input that forces the RESET output low when pulled to GND for ≥1µs. After release, RESET remains asserted for the full 150ms timeout period (D3). An internal 1.5kΩ pull-up to VCC1 allows direct connection to a momentary switch without external biasing - simplifying front-panel reset implementation in MAX6737XKTGD3-based designs.

Is MAX6737XKTGD3 compatible with lead-free PCB assembly processes?

Yes, MAX6737XKTGD3 is available in lead-free packaging. Per Maxim's ordering note, replace the "-T" suffix with "+T" (e.g., MAX6737XKTGD3+T) to specify RoHS-compliant, lead-free SC70-5 packaging. The device supports standard reflow profiles including JEDEC J-STD-020 moisture sensitivity level 1 (MSL-1), enabling compatibility with automated lead-free SMT lines.