Analog Devices Inc./Maxim Integrated MAX6835HXSD0+

Overview

MAX6835HXSD0+ from Maxim Integrated is a 4-pin SC70 ultra-low-voltage microprocessor reset circuit with push-pull active-low RESET output, 1.313V factory-set reset threshold (H suffix), and 70µs timeout period (D0 suffix). It monitors +1.2V to +1.8V supplies in portable systems, asserts reset during brownout or manual trigger, and guarantees valid reset down to VCC = 0.55V. Designed for battery-powered µP power monitoring.

For engineers reviewing the MAX6835HXSD0+ datasheet, MAX6835HXSD0+ pinout, MAX6835HXSD0+ application, or MAX6835HXSD0+ equivalent, this page delivers verified specifications, package mapping, functional alternatives, and design-critical timing behavior - all confirmed for the exact part number including RoHS-compliant "+" suffix and SC70-4 packaging.

Technical Context

The MAX6835HXSD0+ implements a precision voltage comparator with ±2.5% threshold accuracy over –40°C to +85°C, internally referenced to 1.313V, and immune to fast VCC transients (<100ns glitch rejection). Its reset assertion logic combines VCC monitoring and debounced MR input, with fixed 70µs timeout ensuring reliable µP initialization after power-up.

It uses BiCMOS process technology (681 transistors), draws only 7.5µA typical supply current at 1.2V, and features an internal 20kΩ MR pullup. The push-pull active-low RESET output sinks 15µA at VCC ≥ 0.55V and maintains valid logic low down to 0.55V supply - critical for low-voltage SoC reset integrity.

Key Specifications

Pinout & Package

MAX6835HXSD0+ is housed in a 4-pin SC70-4 package (1.3mm × 1.1mm, 0.65mm pitch), RoHS-compliant per "+" suffix. Pin 1 = GND, Pin 2 = RESET, Pin 3 = MR, Pin 4 = VCC.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6835HXSD0+, MAX6381XR29D3+ targets higher-voltage systems and lacks MR debounce, while TPS3123E13DBVR trades 70µs responsiveness for sub-µA quiescent current - making MAX6835HXSD0+ optimal for 1.3V fast-boot portable designs where timing and integration matter most.

Availability

MAX6835HXSD0+ is available at Aetrix Electronics and suitable for portable medical devices, industrial sensor nodes, wearable electronics, and battery-powered IoT controllers requiring stable component supply with guaranteed long-term continuity.

Supply support for MAX6835HXSD0+ 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, with emphasis on high-reliability, low-power solutions.

The MAX6832–MAX6840 family was engineered specifically for ultra-low-voltage µP reset supervision in space-constrained, battery-operated systems - delivering factory-trimmed thresholds, minimal current draw, and SC70 packaging.

FAQ

What is the exact reset threshold voltage of MAX6835HXSD0+ and how is it specified?

The MAX6835HXSD0+ has a factory-set reset threshold of 1.313V, defined by the "H" suffix in its part number. This value is guaranteed over –40°C to +85°C with ±2.5% accuracy, meaning the actual threshold falls between 1.280V and 1.346V across temperature. It is designed for use with 1.3V nominal supplies and does not require external adjustment or calibration.

Does MAX6835HXSD0+ include manual reset debounce, and how is it implemented?

Yes, MAX6835HXSD0+ includes internal hardware debounce for the MR (manual reset) input. The MR pin features a built-in 20kΩ pullup to VCC and is debounced without external components. When MR is pulled low, reset is asserted immediately; upon release, the internal circuitry ensures reset remains active for a fixed interval before deassertion - eliminating need for RC filters or firmware polling.

What is the minimum VCC voltage at which MAX6835HXSD0+ guarantees valid RESET output?

MAX6835HXSD0+ guarantees valid active-low RESET output down to VCC = 0.55V. Below this level, the push-pull driver ceases sinking current and becomes high-impedance. For applications requiring reset validity down to 0V, a 100kΩ pulldown resistor on the RESET line is recommended - a design detail explicitly documented for MAX6835HXSD0+ in the Applications Information section.

How does the 70µs timeout period (D0 suffix) of MAX6835HXSD0+ impact µP startup timing?

The 70µs timeout period of MAX6835HXSD0+ defines the minimum duration RESET remains asserted after VCC rises above 1.313V or after MR is released. This is the shortest available option in the MAX6832–MAX6840 family and enables rapid µP release - critical for low-latency applications like wearables or sensor nodes where boot time directly affects user experience or measurement duty cycle.

Is MAX6835HXSD0+ pin-compatible with other devices in the MAX6832–MAX6840 family, and what are the key compatibility constraints?

MAX6835HXSD0+ is pin-compatible with MAX6836HXSD0+ and MAX6837HXSD0+ (same SC70-4 pinout: GND, RESET, MR, VCC), but not with 3-pin variants (e.g., MAX6832/MAX6833/MAX6834). Compatibility requires matching reset polarity (push-pull active-low), threshold suffix (H), and timeout suffix (D0); substituting a D1/D2 variant changes timing behavior and may violate µP reset timing requirements.