Analog Devices Inc./Maxim Integrated MAX6833FXRD3+T

Overview

MAX6833FXRD3+T from Maxim Integrated is a push-pull active-high voltage supervisor IC designed to monitor +1.05V supply rails in ultra-low-voltage microprocessor systems. It provides factory-set 1.05V reset threshold with ±2.5% accuracy over temperature, 210ms reset timeout, and 7.5µA typical supply current - enabling reliable power-on reset assertion in portable battery-powered equipment.

For engineers reviewing the MAX6833FXRD3+T datasheet, MAX6833FXRD3+T pinout, MAX6833FXRD3+T application, or MAX6833FXRD3+T equivalent, key selection criteria include its SC70-3 package, guaranteed reset validity down to VCC = 0.75V, immunity to sub-100ns MR glitches, and compatibility with low-noise 1.05V core supplies in space-constrained embedded designs.

Technical Context

The MAX6833FXRD3+T implements a precision bandgap-based voltage comparator with hysteresis (0.75% of VTH) to detect VCC drops below 1.05V, asserting an active-high RESET signal. Its internal 20kΩ MR pullup enables direct connection of a momentary switch to ground without external components.

Reset remains asserted for exactly 210ms after VCC rises above 1.05V or after MR deassertion, with propagation delay under 70µs for D0 variants and startup time of 150µs from 0V. The device operates across -40°C to +85°C with no external adjustments required.

Key Specifications

Pinout & Package

MAX6833FXRD3+T is housed in a 3-pin SC70 package (1.25mm × 0.8mm, 0.65mm pitch), optimized for space-constrained portable electronics. Pin 1 is GND, Pin 2 is RESET (push-pull active-high), and Pin 3 is VCC.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX809TRD3+T and TPS3123QDBVRQ1, the MAX6833FXRD3+T uniquely delivers 1.05V threshold accuracy in SC70-3 with 7.5µA quiescent current - making it optimal for space- and power-constrained 1.05V core supply monitoring where automotive qualification is unnecessary.

Availability

MAX6833FXRD3+T is available at Aetrix Electronics and suitable for portable medical devices, battery-powered wearables, and low-voltage microcontroller systems requiring stable component supply with guaranteed long-term availability.

Supply support for MAX6833FXRD3+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 management, sensing, and interface applications in industrial, computing, and consumer markets.

The MAX6832–MAX6840 family was engineered specifically for ultra-low-voltage µP reset supervision in battery-critical portable electronics, emphasizing minimal quiescent current, small footprint, and factory-trimmed thresholds for 1.2V–1.8V supply rails.

FAQ

What is the exact reset threshold voltage of the MAX6833FXRD3+T?

The MAX6833FXRD3+T has a factory-set reset threshold of 1.05V with ±2.5% accuracy over the full -40°C to +85°C operating temperature range. This value is confirmed in the Electrical Characteristics table of the official datasheet (Rev 2, 12/05), where "F" suffix corresponds to 1.020V (min), 1.050V (typ), and 1.080V (max) at TA = -40°C to +85°C. The MAX6833FXRD3+T does not require external calibration.

Does the MAX6833FXRD3+T support manual reset functionality?

Yes, the MAX6833FXRD3+T includes a debounced manual reset input (MR) with an internal 20kΩ pullup resistor to VCC. Pulling MR low forces an immediate active-high RESET assertion, which remains active for the full 210ms timeout period after MR returns high. No external debounce circuitry is needed, and MR accepts CMOS-level signals or open-drain inputs.

What is the minimum VCC voltage at which the MAX6833FXRD3+T guarantees valid reset output?

The MAX6833FXRD3+T guarantees valid active-high RESET output down to VCC = 0.75V, as specified in the Absolute Maximum Ratings and Electrical Characteristics tables. Below 0.75V, reset behavior is not guaranteed; however, the device continues to operate down to 0.55V for other variants (e.g., MAX6832). This 0.75V specification ensures robust reset assertion during gradual battery discharge in 1.05V systems.

Can the MAX6833FXRD3+T be used with a 1.2V supply?

Yes, the MAX6833FXRD3+T operates reliably with a 1.2V supply: its supply voltage range is 0.75V to 3.6V, and its 1.05V reset threshold is intentionally set below 1.2V to provide adequate margin against brownout. At 1.2V, supply current is 9µA (typ), and RESET output high-level voltage (VOH) is guaranteed ≥0.8 × VCC (≥0.96V) with 150µA source capability - fully compatible with standard 1.2V logic interfaces.

Is the MAX6833FXRD3+T pin-compatible with other members of the MAX6832–MAX6840 family?

The MAX6833FXRD3+T shares identical SC70-3 pinout (GND, RESET, VCC) with MAX6832 and MAX6834 variants, but differs functionally: MAX6832/MAX6834 use active-low RESET, while MAX6833FXRD3+T uses active-high. Pin compatibility exists only within same-output-type groups (e.g., MAX6833/MAX6836/MAX6839); substituting with MAX6832 would invert reset logic and cause system failure unless circuitry is redesigned.