Analog Devices Inc./Maxim Integrated MAX6315US26D2

Overview

MAX6315US26D2 from Maxim Integrated is a low-power CMOS microprocessor supervisory circuit in SOT143 package that monitors VCC supply voltage and asserts an open-drain active-low RESET signal when voltage falls below 2.63V or upon manual reset assertion. It guarantees reset timeout of 20ms (min), draws only 5µA supply current, and supports operation from -40°C to +125°C. Used for reliable power-on reset in battery-powered microcontroller systems.

For engineers reviewing the MAX6315US26D2 datasheet, MAX6315US26D2 pinout, MAX6315US26D2 application, or MAX6315US26D2 equivalent, key selection criteria include factory-trimmed 2.63V reset threshold, 20ms minimum timeout, open-drain output capable of level-shifting above VCC, immunity to short VCC transients, and guaranteed performance over industrial temperature range.

Technical Context

The MAX6315US26D2 implements a precision voltage-monitoring comparator with laser-trimmed internal resistive divider to set nominal VTH = 2.63V ±1.8% at +25°C, with tempco of 60ppm/°C. Its internal timer initiates on VCC rise above VTH and holds RESET low for ≥20ms after recovery.

RESET is an open-drain n-channel MOSFET output rated for 0V to +6V pull-up, sinking up to 0.5mA at VOL ≤0.4V. MR features a 63kΩ internal pull-up and accepts logic-low pulses ≥1µs to trigger reset, with 100ns glitch rejection.

Key Specifications

Pinout & Package

SOT143 (4-pin, surface-mount) package with 1.3mm × 2.9mm footprint, 0.95mm height, and gull-wing leads. RoHS-compliant lead-free option available (replace "-T" with "+T").

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6315US26D2, the D1-T variant offers faster reset release for speed-critical designs, while the D3-T variant provides longer hold time for legacy or high-capacitance systems-both share identical pinout, V_TH, and temperature rating, enabling drop-in replacement where timeout alignment is verified.

Availability

MAX6315US26D2 is available at Aetrix Electronics and suitable for battery-powered portable devices, industrial microcontroller systems, and automotive body control modules requiring stable component supply, long-term lifecycle support, and guaranteed -40°C to +125°C operation.

Supply support for MAX6315US26D2 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, sensing, and interface applications, with emphasis on reliability and integration.

The MAX6315 family delivers cost-effective, low-power µP supervisory circuits optimized for robust power monitoring in space-constrained, battery-sensitive, and thermally demanding systems.

FAQ

What is the exact reset threshold voltage for MAX6315US26D2?

The MAX6315US26D2 has a factory-laser-trimmed nominal reset threshold of 2.63V, with tolerance of ±1.8% at +25°C and ±3.5% over full -40°C to +125°C temperature range. This value is fixed per device and cannot be adjusted externally. The MAX6315US26D2 uses internal trimmed resistors to achieve this precision without external components.

Does MAX6315US26D2 support operation below 2.63V?

Yes - the MAX6315US26D2 remains functional down to V_CC = 1.0V, and guarantees RESET remains asserted (low) for V_CC ≤ 1.0V. This ensures fail-safe behavior during deep brownout or battery exhaustion, even though the 2.63V threshold is no longer actively monitored below ~1.2V.

Can the RESET output of MAX6315US26D2 be pulled up to 5V while VCC is 3.3V?

Yes - the MAX6315US26D2 RESET pin is open-drain and rated for voltages up to +6.0V, allowing it to be pulled up to 5V (or any voltage between 0V and 6V) independently of its 3.3V VCC supply. This enables level-shifting in multi-rail systems, a core design feature confirmed in the MAX6315US26D2 datasheet.

What is the minimum pulse width required on MR to trigger reset in MAX6315US26D2?

The MAX6315US26D2 requires a minimum MR low pulse width of 1µs to reliably assert reset. The device also provides 100ns glitch rejection, meaning transients shorter than 100ns on MR will not cause unintended reset activation - a key reliability feature documented in the MAX6315US26D2 Electrical Characteristics table.

Is MAX6315US26D2 pin-compatible with MAX811?

Yes - the MAX6315US26D2 is explicitly stated as pin-compatible with the MAX811 in its official features list. Both use SOT143 packaging with identical pin 1 (GND), pin 2 (RESET), pin 3 (MR), and pin 4 (VCC) assignments, enabling direct substitution where the 2.63V/20ms configuration meets system requirements.