Analog Devices Inc./Maxim Integrated MAX6713ZEXS

Overview

The MAX6713ZEXS from Maxim Integrated is a precision microprocessor supervisory circuit with open-drain active-low RESET output, designed to monitor +2.5V power supplies and assert reset during brownout or power-up conditions. It features a 2.32V reset threshold (±1.5% over -40°C to +125°C), 140ms minimum reset timeout, 12µA supply current, and guaranteed reset validity down to VCC = +1V. It is used in battery-powered instrumentation and automotive control modules requiring reliable low-voltage supervision.

For engineers reviewing the MAX6713ZEXS datasheet, MAX6713ZEXS pinout, MAX6713ZEXS application, or MAX6713ZEXS equivalent, key selection criteria include its open-drain output architecture, 2.32V threshold for +2.5V systems, SC70-4 package compatibility, manual reset input with internal 20kΩ pull-up, and immunity to sub-20µs VCC transients at 100mV overdrive.

Technical Context

The MAX6713ZEXS implements a precision bandgap-based voltage comparator with hysteresis to detect VCC falling below 2.32V, triggering an open-drain RESET signal that remains asserted for ≥140ms after recovery. Its MR input accepts TTL/CMOS logic or switch-to-ground activation, with built-in 20kΩ pull-up and 100ns glitch immunity.

Unlike push-pull variants (MAX6711/MAX6712), the MAX6713ZEXS requires an external pull-up resistor on RESET-enabling level-shifting to higher voltages (up to +6V) and direct interfacing with bidirectional µP reset pins such as those on Motorola 68HC11. Reset output leakage is ≤50nA at VCC = 1V, ensuring valid logic state down to 1V supply.

Key Specifications

Pinout & Package

MAX6713ZEXS is housed in a 4-pin SC70-4 package (2.0mm × 2.1mm, 0.65mm pitch), optimized for space-constrained portable and automotive PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6713ZEXS, MAX6316LUR23D3+T offers lower supply current but forfeits level-shifting capability, while TPS3808G125DBVR enables threshold tuning at the cost of added components and larger footprint-making MAX6713ZEXS optimal for fixed-threshold, space-constrained, multi-rail systems.

Availability

MAX6713ZEXS is available at Aetrix Electronics and suitable for battery-powered instrumentation, automotive body electronics, and portable medical diagnostics requiring stable component supply, long-lifecycle support, and lead-free compliance.

Supply support for MAX6713ZEXS 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 industrial, automotive, and computing applications, emphasizing reliability, integration, and low-power operation.

The MAX671x family delivers highly accurate, single-chip µP supervisors targeting space- and power-constrained systems where deterministic reset behavior under brownout, cold-cranking, and transient conditions is critical.

FAQ

What is the exact reset threshold voltage of the MAX6713ZEXS and how tightly is it specified?

The MAX6713ZEXS has a factory-trimmed reset threshold of 2.32V with ±1.5% tolerance over the full operating temperature range (-40°C to +125°C). This specification is guaranteed-not typical-and applies directly to the MAX6713ZEXS variant per Maxim's Selector Guide and Electrical Characteristics table. The 2.32V value is calibrated for use with +2.5V nominal supplies, providing a robust 7.2% undervoltage margin before reset assertion. No external adjustment is needed.

Does the MAX6713ZEXS require an external pull-up resistor on the RESET pin, and what voltage can it be connected to?

Yes, the MAX6713ZEXS requires an external pull-up resistor on its open-drain RESET pin because it cannot drive high actively. The pull-up may connect to any voltage between 0V and +6.0V-including supplies higher than VCC (e.g., +3.3V or +5.0V)-enabling level-shifting functionality. Typical values range from 10kΩ to 100kΩ depending on bus capacitance and sink current requirements. This architecture allows the MAX6713ZEXS to interface with µPs having bidirectional reset pins or multi-voltage system reset buses.

How does the MAX6713ZEXS behave when VCC drops below 1V, and is reset still valid?

The MAX6713ZEXS guarantees RESET output validity down to VCC = +1.0V: below this, the output transitions to high-impedance (leakage ≤50nA), and no active drive is maintained. While RESET is not actively driven below 1V, the open-drain structure means an external pull-up will hold it high-potentially causing unintended deassertion. For applications requiring valid reset down to 0V, a pull-down resistor (e.g., 100kΩ to GND) on RESET is recommended to ensure it remains low during deep brownout. This behavior is explicitly characterized in the datasheet's "Ensuring a Valid Reset Output Down to VCC = 0" section.

Can the manual reset (MR) input of the MAX6713ZEXS be left unconnected, and what happens if it is?

Yes, the MR input of the MAX6713ZEXS can be left unconnected because it features an internal 20kΩ pull-up resistor to VCC. When floating, MR remains at logic-high, and the device operates solely in power-supply-monitoring mode. No external components are required. If manual reset functionality is needed, a normally open momentary switch between MR and GND provides clean, debounced reset initiation-no external RC network is necessary due to built-in glitch immunity (100ns minimum pulse rejection).

What is the minimum reset pulse width guaranteed by the MAX6713ZEXS after VCC recovers above threshold?

The MAX6713ZEXS guarantees a minimum reset pulse width of 140ms after VCC rises above the 2.32V threshold. This timeout is factory-trimmed and fully specified over temperature (-40°C to +125°C); no external timing components are required. The 140ms duration ensures sufficient time for microprocessors, memory controllers, and peripheral ICs to complete power-on initialization sequences-including clock stabilization, PLL lock, and register clearing-before firmware execution begins. This value is independent of MR deassertion timing and applies to both power-up and brownout recovery events.