Analog Devices Inc./Maxim Integrated MAX6408BS26-T

Overview

MAX6408BS26-T from Maxim Integrated is an ultra-low-power, open-drain, active-low voltage detector with a factory-trimmed 2.63V threshold (±2.5% over -40°C to +85°C), 500nA supply current, and guaranteed output validity down to VCC = 1.0V. It monitors battery or regulated supply rails in portable electronics and asserts reset when voltage drops below threshold.

For engineers reviewing the MAX6408BS26-T datasheet, MAX6408BS26-T pinout, MAX6408BS26-T application, or MAX6408BS26-T equivalent, key selection criteria include its open-drain output configuration, 2.63V detection threshold, UCSP-4 package footprint, manual reset input with internal 50kΩ pullup, and immunity to sub-100ns VCC transients.

Technical Context

The MAX6408BS26-T implements a precision bandgap reference comparator architecture with hysteresis of 6.3mV, enabling stable detection without external components. Its output remains valid across VCC = 1.0V to 5.5V, supporting brownout monitoring in deeply discharged battery scenarios.

It features a dedicated active-low manual reset (MR) input with 1µs minimum pulse width and 100ns glitch rejection, allowing system-level reset initiation independent of supply voltage. The open-drain OUT terminal requires an external pullup and sinks up to 1.6mA at VCC ≥ 2.1V.

Key Specifications

Pinout & Package

MAX6408BS26-T is housed in a 4-bump, 2mm × 2mm UCSP (Ultra Compact Silicon Package) with bottom-side solder bumps. This chip-scale package delivers 70% smaller footprint than SC70 while maintaining compatibility with standard SMT assembly processes.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6406BS26-T and TLV803EB26DBZR, the MAX6408BS26-T uniquely combines ultra-low 500nA current, open-drain flexibility, and integrated manual reset in a 2mm × 2mm footprint-making it optimal for space-constrained, multi-rail, battery-critical designs.

Availability

MAX6408BS26-T is available at Aetrix Electronics and suitable for cell phones, MP3 players, and pagers requiring stable component supply with long-term manufacturability and RoHS-compliant sourcing.

Supply support for MAX6408BS26-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) is a U.S.-based semiconductor company specializing in high-performance analog and mixed-signal ICs for power, sensing, and interface applications.

The MAX6406–MAX6411 family was designed specifically for ultra-low-power voltage supervision in portable and battery-operated equipment, emphasizing minimal footprint, nanoscale current draw, and factory-trimmed accuracy without external components.

FAQ

What is the exact reset threshold voltage of the MAX6408BS26-T?

The MAX6408BS26-T has a factory-trimmed nominal reset threshold of 2.63V, with guaranteed tolerance of ±2.5% over the full operating temperature range (–40°C to +85°C). At +25°C, the threshold is specified between 2.591V (min) and 2.669V (max), per Table 1 in the datasheet. This value is laser-trimmed during production and does not require external calibration.

Does the MAX6408BS26-T require an external pullup resistor on the OUT pin?

Yes, the MAX6408BS26-T features an open-drain OUT pin and requires an external pullup resistor to a valid logic supply (up to 5.5V). The resistor value must be selected to ensure VOL ≤ 0.4V when sinking 1.6mA (at VCC ≥ 2.1V) and to provide sufficient drive for connected inputs. Typical values range from 10kΩ to 100kΩ depending on bus capacitance and speed requirements.

Can the MAX6408BS26-T operate reliably below 1.8V?

Yes, the MAX6408BS26-T is fully specified to operate with VCC as low as 1.0V, and its output remains valid (guaranteed logic state) across this entire range. This capability enables use in deeply discharged battery scenarios and low-voltage backup systems where other supervisors fail to assert reset reliably.

What is the function and electrical behavior of the MR pin on the MAX6408BS26-T?

The MR (Manual Reset) pin on the MAX6408BS26-T is an active-low input with an internal 50kΩ pullup to VCC. Driving MR low asserts the OUT signal regardless of VCC level. It accepts TTL/CMOS logic levels and supports noise immunity via optional 0.1µF capacitor to GND. Minimum pulse width is 1µs; glitch rejection is rated at 100ns.

Is the MAX6408BS26-T pin-compatible with other members of the MAX6406–MAX6411 family?

Yes, all MAX6406–MAX6411 variants-including MAX6408BS26-T-share identical UCSP-4 pinout (GND, OUT, MR, VCC) and mechanical footprint. However, output type differs: MAX6408/MAX6411 use open-drain, while MAX6406/MAX6409 use push-pull. Swapping requires verifying output topology compatibility with downstream logic.