Analog Devices Inc./Maxim Integrated MAX6835VXSD3+T

Overview

MAX6835VXSD3+T from Maxim Integrated is an ultra-low-voltage microprocessor supervisory circuit in SC70-4 package, featuring a push-pull active-low reset output, 1.575V factory-set reset threshold (suffix V), and 210ms reset timeout period (suffix D3). It monitors +1.2V to +1.8V supplies in portable and battery-powered systems, asserting RESET when VCC falls below threshold or MR is pulled low, with guaranteed operation down to VCC = 0.55V.

For engineers reviewing the MAX6835VXSD3+T datasheet, MAX6835VXSD3+T pinout, MAX6835VXSD3+T application, or MAX6835VXSD3+T equivalent, key selection criteria include reset threshold accuracy (±2.5%), low 7.5µA supply current, debounced manual reset input, immunity to short VCC transients, and compatibility with 3.3V/1.8V/1.2V logic domains in space-constrained designs.

Technical Context

The MAX6835VXSD3+T implements a precision voltage comparator with 444mV internal reference, comparing VCC against a factory-trimmed threshold derived from that reference. Its reset assertion logic includes fixed 210ms timeout after VCC recovery and synchronized debouncing of the MR input using internal timing circuitry.

It features a push-pull active-low RESET output capable of sinking 200µA at VCC ≥ 1.5V while maintaining VOL ≤ 0.2V, and integrates a 20kΩ internal pullup on MR. The device operates across -40°C to +85°C with no external components required for basic supervision functionality.

Key Specifications

Pinout & Package

MAX6835VXSD3+T is housed in a 4-pin SC70-4 package (1.3mm × 1.6mm, 0.65mm pitch) with gull-wing leads, RoHS-compliant and lead-free (indicated by "+T" suffix).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6835VXSD3+T, MAX6381XR22+T offers smaller footprint but cannot supervise 1.6V rails or support manual reset, while TPS3123E15DBVR provides open-drain flexibility at the expense of higher current and reduced integration-making MAX6835VXSD3+T optimal for compact, low-power, fully integrated 1.6V system supervision.

Availability

MAX6835VXSD3+T is available at Aetrix Electronics and suitable for wearable health monitors, industrial sensor nodes, medical infusion pumps, smart energy meters, and battery-powered IoT edge devices requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6835VXSD3+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

Maxim Integrated, now part of Analog Devices, designs precision analog and mixed-signal ICs for power, sensing, and interface applications in industrial, automotive, and computing markets.

The MAX6832–MAX6840 family delivers ultra-low-voltage supervision for next-generation portable and energy-constrained systems, targeting applications where sub-1µA quiescent current and SC70 packaging are critical to size and battery life.

FAQ

What is the exact reset threshold voltage of MAX6835VXSD3+T and how is it trimmed?

The MAX6835VXSD3+T has a factory-trimmed reset threshold of 1.575V with ±2.5% accuracy over -40°C to +85°C. This value is laser-trimmed during final test using Maxim's BiCMOS process, referencing an internal 444mV bandgap-derived voltage. The "V" suffix in the part number explicitly denotes this 1.575V threshold, and the trim is guaranteed per Electrical Characteristics table in the datasheet. No external adjustment is possible on MAX6835VXSD3+T.

Does MAX6835VXSD3+T require external components for basic operation?

No, MAX6835VXSD3+T requires zero external components for core supervision functionality. Its 1.575V threshold is factory-set, MR includes a 20kΩ internal pullup, and the push-pull RESET output needs no pullup resistor. Only optional components-such as a 0.1µF VCC bypass capacitor or MR-to-ground debounce capacitor-are recommended for enhanced noise immunity in electrically noisy environments.

How does the 210ms reset timeout period of MAX6835VXSD3+T affect system startup timing?

The 210ms reset timeout ensures the MAX6835VXSD3+T holds RESET low for at least 210ms after VCC rises above 1.575V, providing ample margin for slow-ramping power supplies and µP internal clock stabilization. This exceeds typical ARM Cortex-M0+ startup requirements (≤100ms) and aligns with JEDEC specifications for memory initialization, preventing race conditions between power rail stability and firmware execution in the MAX6835VXSD3+T supervised system.

Can MAX6835VXSD3+T monitor a 1.2V supply while driving a 3.3V logic-level RESET signal?

No, MAX6835VXSD3+T cannot drive a 3.3V logic-level RESET signal because its push-pull output is referenced to VCC and clamped to VCC − 0.2V (max) when asserted. When VCC = 1.2V, RESET high-state voltage is ≤0.96V-insufficient for 3.3V CMOS input thresholds. For level-shifted RESET, use MAX6834VXSD3+T (open-drain) with external 3.3V pullup, not MAX6835VXSD3+T.

What is the minimum VCC voltage at which MAX6835VXSD3+T guarantees valid RESET output behavior?

MAX6835VXSD3+T guarantees valid RESET output behavior down to VCC = 0.55V. Below this, the internal output stage ceases sinking current and becomes high-impedance. At VCC ≥ 0.55V, RESET can sink 15µA with VOL ≤ 0.15V (active-low), ensuring robust low-state drive into CMOS inputs. This specification is tested and guaranteed across temperature per Absolute Maximum Ratings and Electrical Characteristics tables.