Analog Devices Inc./Maxim Integrated MAX6834VXRD3+T

Overview

MAX6834VXRD3+T from Maxim Integrated is an ultra-low-voltage, open-drain active-low microprocessor reset circuit in a 3-pin SC70 package, designed to monitor +1.575V supply rails with ±2.5% threshold accuracy over temperature and assert reset for 210ms after VCC recovery or manual reset deassertion. It operates down to VCC = 0.55V, consumes only 7.5µA typical supply current, and is used in portable battery-powered systems requiring reliable brownout protection.

For engineers reviewing the MAX6834VXRD3+T datasheet, MAX6834VXRD3+T pinout, MAX6834VXRD3+T application, or MAX6834VXRD3+T equivalent, key selection criteria include its open-drain RESET output (requiring external pullup), 210ms timeout period (D3 suffix), 1.575V factory-set threshold (V suffix), SC70-3 package footprint, and compatibility with bidirectional µP reset pins.

Technical Context

The MAX6834VXRD3+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 is triggered solely by VCC falling below the selected threshold - not by RESET-IN - as confirmed by pin configuration (GND, RESET, VCC) and family grouping (MAX6832–MAX6837 series).

It features fixed 210ms reset timeout (D3 option), guaranteed reset validity down to VCC = 0.55V, and immunity to fast negative VCC transients ≤100ns at 100mV overdrive. The open-drain output supports level-shifting across supply domains and interfaces directly with bidirectional µP reset I/O without additional logic.

Key Specifications

Pinout & Package

MAX6834VXRD3+T is housed in a 3-pin SC70-3 package (1.25mm × 0.85mm, 0.65mm pitch). Pin 1 is GND, Pin 2 is RESET (open-drain active-low), and Pin 3 is VCC. No MR or RESET-IN pins are present - confirming it belongs to the MAX6832/MAX6834/MAX6838 subgroup without manual reset or adjustable threshold capability.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar voltage detector and µP reset applications.

Compared with MAX809TRD3+T, MAX6834VXRD3+T's open-drain output enables bidirectional reset arbitration and multi-rail level shifting, while its lower 7.5µA current extends battery life. Compared with TPS3808G15DBVR, MAX6834VXRD3+T offers superior ultra-low-voltage operation (down to 0.55V) and smaller SC70-3 footprint, at the cost of no enable function and narrower VCC range.

Availability

MAX6834VXRD3+T is available at Aetrix Electronics and suitable for battery-powered wearables, low-voltage microcontroller systems, portable medical devices, and energy-harvesting edge nodes requiring stable component supply with guaranteed long-term availability.

Supply support for MAX6834VXRD3+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, mixed-signal, and power management ICs for demanding industrial, automotive, and computing applications.

MAX6834VXRD3+T belongs to the MAX6832–MAX6840 family of ultra-low-voltage supervisory circuits, engineered specifically for reliable reset generation in sub-1.8V digital systems where space, power, and accuracy are critical constraints.

FAQ

What is the exact reset threshold voltage of the MAX6834VXRD3+T?

The MAX6834VXRD3+T has a factory-set reset threshold of 1.575V, with ±2.5% accuracy over the full operating temperature range of -40°C to +85°C. This value is confirmed by the 'V' suffix in the part number per the Threshold Suffix Guide and is specified in the Electrical Characteristics table under VTH for MAX6834 devices.

Does the MAX6834VXRD3+T have a manual reset (MR) input?

No, the MAX6834VXRD3+T does not include a manual reset input. Its pin configuration is strictly GND–RESET–VCC in SC70-3, matching the MAX6832/MAX6834/MAX6838 subgroup. Manual reset capability is only present on MAX6835/MAX6836/MAX6837 (4-pin SC70-4) and is explicitly absent from MAX6834VXRD3+T's pin description and functional diagrams.

What is the required external pullup resistor value for the MAX6834VXRD3+T's open-drain RESET output?

The MAX6834VXRD3+T's open-drain RESET output requires an external pullup resistor, typically between 10kΩ and 100kΩ, connected to a defined voltage rail (e.g., same VCC or higher supply). The value depends on rise time requirements and bus capacitance; 47kΩ is commonly used to balance speed and power. The device sinks up to 200µA while asserted, ensuring reliable logic-low levels.

Can the MAX6834VXRD3+T monitor a supply voltage lower than 1.575V?

No - the MAX6834VXRD3+T is factory-trimmed to monitor exactly 1.575V and cannot be adjusted. For lower thresholds (e.g., 1.110V or 1.050V), alternative variants like MAX6834GXRD3+T (1.110V) or MAX6834FXRD3+T (1.050V) must be selected. The RESET-IN feature for adjustable monitoring is exclusive to MAX6838–MAX6840 and not available on MAX6834VXRD3+T.

Is the MAX6834VXRD3+T compatible with bidirectional microprocessor reset pins?

Yes, the MAX6834VXRD3+T's open-drain active-low RESET output is explicitly designed for interoperability with bidirectional µP reset I/O. As documented in Figure 4 of the datasheet, connecting its RESET pin directly to a bidirectional µP reset pin - with a single shared pullup - allows either device to assert reset, enabling system-level fault coordination without additional logic gates or buffers.