Analog Devices Inc./Maxim Integrated MAX6835FXSD0+T

Overview

MAX6835FXSD0+T from Maxim Integrated is a 4-pin SC70 ultra-low-voltage microprocessor reset circuit with push-pull active-low RESET output, 1.050V factory-set reset threshold, and 70µs timeout period. It monitors +1.2V to +1.8V supply rails in portable systems, asserting reset during power-up, brownout, or manual reset events. Designed for battery-powered µP applications requiring guaranteed reset validity down to VCC = 0.55V.

For engineers reviewing the MAX6835FXSD0+T datasheet, MAX6835FXSD0+T pinout, MAX6835FXSD0+T application, or MAX6835FXSD0+T equivalent, key selection criteria include its 1.050V threshold accuracy (±2.5%), 7.5µA typical supply current, SC70-4 package compatibility, and immunity to short negative VCC transients.

Technical Context

The MAX6835FXSD0+T implements a precision voltage comparator with internal 444mV reference and resistor-divider scaling to deliver a fixed 1.050V reset threshold. Its reset assertion logic responds to VCC falling below threshold or MR input deassertion, with propagation delay of 70µs and startup time of 150µs.

It features a debounced manual reset input (MR) with 20kΩ internal pullup, glitch rejection of 100ns, and MR-to-reset delay of 500ns. The push-pull active-low RESET output sinks 15µA at VCC ≥ 0.55V and 200µA at VCC ≥ 1.5V, ensuring robust drive into CMOS inputs without external components.

Key Specifications

Pinout & Package

MAX6835FXSD0+T is housed in a 4-pin SC70-4 package (1.3mm × 1.6mm, 0.65mm pitch), optimized for space-constrained portable designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX809TRD1+T and TPS3808G01DBVR, the MAX6835FXSD0+T uniquely combines 1.050V threshold, 70µs timeout, debounced MR, and SC70-4 packaging-enabling compact, low-power, fast-recovery supervision for 1.2V core domains where timing precision and manual reset are critical.

Availability

MAX6835FXSD0+T is available at Aetrix Electronics and suitable for wearable electronics, industrial sensor nodes, medical infusion pumps, and smart metering modules requiring stable component supply and long-term lifecycle support.

Supply support for MAX6835FXSD0+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 is a semiconductor company specializing in analog and mixed-signal ICs for power management, sensing, and interface applications.

The MAX6832–MAX6840 family was designed specifically for ultra-low-voltage microprocessor supervision in portable and battery-powered systems, emphasizing minimal quiescent current, small footprint, and precise threshold accuracy.

FAQ

What is the exact reset threshold voltage of the MAX6835FXSD0+T?

The MAX6835FXSD0+T has a factory-set reset threshold of 1.050V with ±2.5% accuracy over the full -40°C to +85°C temperature range. This value is confirmed in the Electrical Characteristics table of the official datasheet (Rev 2, 12/05), where suffix "F" corresponds to 1.020V (min), 1.050V (typ), and 1.080V (max) at TA = -40°C to +85°C.

Does the MAX6835FXSD0+T support manual reset functionality?

Yes, the MAX6835FXSD0+T includes a debounced manual reset input (MR) on Pin 3. It features an internal 20kΩ pullup to VCC, requires a minimum 2µs low pulse width, and provides 100ns glitch rejection. This allows direct connection to a momentary switch without external RC components, as documented in the Functional Diagrams and Pin Description sections.

What is the timeout period for the MAX6835FXSD0+T, and how is it selected?

The MAX6835FXSD0+T has a fixed 70µs reset active timeout period, indicated by the "D0" suffix in its ordering code. This is the shortest available option in the MAX6832–MAX6840 family and is intended for voltage detector operation or fast power sequencing. No external components or configuration pins are required to set this timing.

Can the MAX6835FXSD0+T operate reliably at VCC = 0.6V?

Yes-the MAX6835FXSD0+T guarantees reset validity down to VCC = 0.55V for its push-pull active-low RESET output. At 0.6V, the output fully meets VOL specifications (≤0.15V at ISINK = 15µA), ensuring clean logic-low assertion even during deep brownout conditions, as specified in the Electrical Characteristics table.

Is the MAX6835FXSD0+T pin-compatible with other devices in the MAX6832–MAX6840 family?

The MAX6835FXSD0+T shares the same SC70-4 pinout (GND, RESET, MR, VCC) with MAX6836FXSD0+T and MAX6837FXSD0+T, differing only in reset polarity (active-high for MAX6836) and output type (open-drain for MAX6837). It is not pin-compatible with SC70-3 variants (e.g., MAX6832/MAX6833) or RESET-IN versions (MAX6838–MAX6840), which have different pin assignments.