Analog Devices Inc./Maxim Integrated MAX6736XKVDD3

Overview

The MAX6736XKVDD3 from Maxim Integrated is a dual-voltage microprocessor supervisor IC with two factory-trimmed reset thresholds (VTH1 = 2.925V, VTH2 = 0.788V), open-drain active-low RESET output, manual reset input (MR), and 150ms minimum reset timeout period. It monitors primary I/O supply (VCC1) and secondary core supply (VCC2) in portable, battery-powered systems requiring reliable power-on reset and brownout detection.

For engineers reviewing the MAX6736XKVDD3 datasheet, MAX6736XKVDD3 pinout, MAX6736XKVDD3 application, or MAX6736XKVDD3 equivalent, this device delivers precision dual-supply monitoring with ultra-low 6µA quiescent current, SC70-5 packaging for space-constrained designs, and guaranteed operation across –40°C to +85°C industrial temperature range.

Technical Context

The MAX6736XKVDD3 implements independent voltage comparators for VCC1 and VCC2, each referenced to a precision internal bandgap-derived threshold. Reset assertion occurs when either supply falls below its trimmed threshold, and reset remains asserted for ≥150ms after both supplies recover - with automatic timer restart on subsequent dips.

Its open-drain RESET output requires an external pullup and interfaces directly with bidirectional µP reset pins; MR provides CMOS-compatible active-low manual reset with internal 1.5kΩ pullup to VCC1 and 150ms timeout. No POK, RSTIN, PFI, or PFO functions are implemented in this variant.

Key Specifications

Pinout & Package

MAX6736XKVDD3 is housed in a 5-pin SC70-5 package (1.6mm × 1.6mm × 0.9mm height), optimized for ultra-compact portable electronics. Pin 1 is RESET (open-drain 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-voltage supervisor applications.

Compared with MAX6737XKVDD3, the MAX6736XKVDD3 offers open-drain flexibility for bus sharing and level translation, while TPS3808G15DBVR trades dual monitoring for ultra-low IQ but cannot replace the core/I/O coordination function.

Availability

MAX6736XKVDD3 is available at Aetrix Electronics and suitable for portable medical sensors, industrial IoT edge nodes, handheld barcode scanners, and smart POS terminals requiring stable component supply with guaranteed long-term manufacturability.

Supply support for MAX6736XKVDD3 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 management, sensing, and connectivity in demanding industrial and portable applications.

The MAX6736–MAX6745 family was engineered specifically for multivoltage microprocessor systems needing compact, low-power, factory-calibrated reset supervision - eliminating external resistors and trimming while maintaining ±2.5% threshold accuracy over temperature.

FAQ

What are the exact reset threshold voltages for MAX6736XKVDD3?

The MAX6736XKVDD3 has factory-trimmed reset thresholds of VTH1 = 2.925V (for VCC1) and VTH2 = 0.788V (for VCC2), specified over –40°C to +85°C with ±0.075V and ±0.020V tolerance respectively. These values are confirmed in Table 1 of the MAX6736–MAX6745 datasheet and correspond directly to the "SV" suffix in the part number. The MAX6736XKVDD3 uses the D3 timeout option (150ms min), not D7.

Does MAX6736XKVDD3 support power-fail detection or POK output?

No, the MAX6736XKVDD3 does not include power-fail (PFI/PFO) or power-OK (POK1) functionality. Per the Selector Guide and Pin Configurations, it is a dual-fixed-threshold supervisor with RESET, MR, VCC1, VCC2, and GND pins only. Devices with PFI/PFO (e.g., MAX6742/MAX6745) or POK1 (e.g., MAX6741/MAX6744) have different pinouts and part number suffixes - MAX6736XKVDD3 lacks those terminals entirely.

What is the recommended external pullup resistor value for the RESET pin of MAX6736XKVDD3?

For the open-drain RESET output of MAX6736XKVDD3, a 10kΩ to 100kΩ pullup to VCC1 is recommended. At 3.3V VCC1 and 3.2mA sink current, VOL ≤ 0.4V is guaranteed; a 47kΩ resistor limits current to ~70µA while ensuring fast rise time and noise margin. Lower values improve speed but increase static current; higher values reduce current but risk slow edges in noisy environments.

Can MAX6736XKVDD3 monitor a 1.8V supply as VCC2?

No - the MAX6736XKVDD3's VCC2 threshold is fixed at 0.788V and is intended for sub-1V core supplies (e.g., 0.8V ASIC cores). Monitoring a 1.8V rail on VCC2 would cause immediate, permanent reset assertion. For 1.8V supervision, VCC1 must be used (with appropriate threshold suffix, e.g., "SD" = 2.925V/1.710V), or a different variant like MAX6738XKSD3-T with adjustable RSTIN should be selected.

Is MAX6736XKVDD3 RoHS-compliant and available in lead-free packaging?

Yes, MAX6736XKVDD3 is RoHS-compliant and available in lead-free packaging. Per the Ordering Information section, lead-free versions are ordered by replacing the "-T" suffix with "+T" (e.g., MAX6736XKVDD3+T). The device meets JEDEC J-STD-020 moisture sensitivity level 1 and is qualified for standard reflow profiles. Tape-and-reel packaging is standard, with 2500-piece minimum order quantity for standard versions.