Analog Devices Inc./Maxim Integrated MAX6836HXSD3

Overview

MAX6836HXSD3 from Maxim Integrated is a push-pull active-high microprocessor supervisory circuit in 4-pin SC70 package, designed to monitor +1.313V supply (H suffix), assert reset for 210ms (D3 suffix), and operate down to VCC = 0.75V with 7.5µA typical supply current. It features debounced manual reset input (MR), ±2.5% reset threshold accuracy over temperature, and immunity to short negative VCC transients - used in portable battery-powered µP systems requiring reliable low-voltage power-up/power-down sequencing.

For engineers reviewing the MAX6836HXSD3 datasheet, MAX6836HXSD3 pinout, MAX6836HXSD3 application, or MAX6836HXSD3 equivalent, key selection criteria include its 1.313V factory-set threshold, 210ms active-high reset timeout, MR debounce capability, SC70-4 footprint compatibility, and guaranteed reset validity down to 0.75V VCC.

Technical Context

The MAX6836HXSD3 implements a precision voltage comparator with internal 444mV reference, comparing VCC against a factory-trimmed threshold (1.313V) to trigger reset assertion on undervoltage. Its reset logic holds the push-pull RESET output high for exactly 210ms after VCC rises above threshold or after MR deassertion.

It integrates a 20kΩ internal MR pullup resistor, supports CMOS-level MR drive, rejects MR glitches <100ns, and maintains functional reset output down to VCC = 0.75V - ensuring compatibility with 1.2V–1.8V core supplies in deeply scaled digital systems.

Key Specifications

Pinout & Package

MAX6836HXSD3 is housed in a 4-pin SC70-4 package (2.0mm × 2.1mm, 0.65mm pitch), optimized for space-constrained portable designs. Pin 1 = GND, Pin 2 = RESET (push-pull active-high), Pin 3 = MR (active-low manual reset), Pin 4 = VCC.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar µP supervisory applications.

Compared with MAX6836HXSD3, MAX6381XR24-T offers tighter threshold tolerance but omits MR, while TPS3808G12DBVR reduces supply current by 80% yet increases board area by 2.5× and adds complexity with watchdog enable/disable control.

Availability

MAX6836HXSD3 is available at Aetrix Electronics and suitable for battery-powered wearables, low-voltage microcontroller systems, and portable medical devices requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.

Supply support for MAX6836HXSD3 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, communications, and consumer applications.

The MAX6832–MAX6840 family was designed specifically for ultra-low-voltage µP supervision in space- and power-constrained portable electronics, targeting 1.2V–1.8V supply rails with minimal external components.

FAQ

What is the exact reset threshold voltage of MAX6836HXSD3 and how is it specified?

The MAX6836HXSD3 has a factory-set reset threshold of 1.313V, with ±2.5% accuracy over the full operating temperature range (-40°C to +85°C). This value is confirmed in the Electrical Characteristics table under "Reset Threshold (VTH)" for suffix H, and applies specifically to the MAX6836 variant with push-pull active-high output. The threshold is trimmed during production and does not require external adjustment.

Does MAX6836HXSD3 support manual reset, and what are its electrical characteristics?

Yes, MAX6836HXSD3 includes a debounced manual reset input (MR) on Pin 3. It features an internal 20kΩ pullup resistor to VCC, accepts CMOS-level logic, requires a minimum pulse width of 2µs, and rejects glitches shorter than 100ns. MR assertion forces RESET high immediately, and reset remains active for the full 210ms timeout after MR is released.

What is the guaranteed minimum VCC level at which MAX6836HXSD3 maintains valid RESET output logic?

MAX6836HXSD3 guarantees valid push-pull active-high RESET output down to VCC = 0.75V. Below this voltage, VOH specifications degrade; the device ensures RESET remains high (asserted) until VCC falls below 0.75V, then transitions to high-impedance. This is explicitly stated in the Absolute Maximum Ratings and Electrical Characteristics tables for MAX6833/MAX6836/MAX6839 variants.

How does the 210ms reset timeout period of MAX6836HXSD3 compare to other options in the MAX6832–MAX6840 family?

The 210ms timeout corresponds to the D3 suffix in the MAX6832–MAX6840 family. Other standard options include D0 (70µs, voltage detector mode), D1 (1.5ms), D2 (30ms), and D4 (1680ms). All timeouts are fixed, factory-programmed, and independent of external components - the D3 option balances sufficient µP initialization time against fast recovery in responsive systems.

Is MAX6836HXSD3 pin-compatible with legacy Maxim reset supervisors like MAX809 or MAX6712?

No, MAX6836HXSD3 is not pin-compatible with MAX809 (SOT-23-3) or MAX6712 (SOT-23-5). It uses a 4-pin SC70-4 package with Pin 1 = GND, Pin 2 = RESET, Pin 3 = MR, Pin 4 = VCC. While the datasheet notes functional similarity and pin compatibility *within* the MAX6832–MAX6840 family (e.g., MAX6835/MAX6837), cross-family pin mapping is not supported due to differing pin counts and assignments.