Analog Devices Inc./Maxim Integrated MAX6314US30D4

Overview

MAX6314US30D4 from Maxim Integrated is a low-power CMOS microprocessor supervisory circuit designed to monitor VCC supply voltage and assert a bidirectional reset signal for µPs with compatible reset I/Os (e.g., 68HC11). It features a factory-trimmed 3.00V reset threshold, 1120ms minimum reset timeout period, ±1.8% threshold accuracy at +25°C, 5µA supply current, and SOT143 package. It is used in portable/battery-powered equipment requiring reliable power-on reset and brownout protection.

For engineers reviewing the MAX6314US30D4 datasheet, MAX6314US30D4 pinout, MAX6314US30D4 application, or MAX6314US30D4 equivalent, key selection criteria include its bidirectional RESET output architecture, 3.00V precision threshold, 1120ms timeout, immunity to short VCC transients, and compatibility with manual reset inputs without external debounce.

Technical Context

The MAX6314US30D4 implements a precision voltage-monitoring comparator with laser-trimmed internal resistors to set the 3.00V reset threshold, and an internal timer that guarantees RESET remains asserted for ≥1120ms after VCC rises above threshold or MR deasserts. Its RESET output combines a 4.7kΩ pull-up resistor with a P-channel active pullup transistor, enabling fast rise time on shared reset buses.

This architecture supports bidirectional reset handshaking with µPs like the 68HC11: the µP can pull RESET low to self-assert reset, while the MAX6314US30D4 drives it low during power faults. The 2µs one-shot active pullup ensures RESET transitions high within two E-clock cycles even with multiple devices and stray capacitance on the line.

Key Specifications

Pinout & Package

SOT143 package: 4-pin, surface-mount, small-outline transistor outline with gull-wing leads; dimensions 2.9mm × 1.5mm × 1.1mm (L × W × H); thermal pad not present; rated for -40°C to +85°C ambient operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6314US30D4, MAX6315US30D4-T lacks active pullup and cannot support bidirectional reset protocols, while TPS3808G30DBVR offers lower current and better accuracy but omits manual reset and bidirectional functionality-making MAX6314US30D4 uniquely suited for legacy µP designs requiring reset source discrimination.

Availability

MAX6314US30D4 is available at Aetrix Electronics and suitable for portable medical monitors, industrial PLC controllers, smart energy meters, and automotive body control modules requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6314US30D4 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 semiconductor company specializing in analog, mixed-signal, and high-reliability ICs for industrial, communications, and computing applications.

The MAX6314 series was designed specifically for microprocessor supervisory functions in resource-constrained systems, emphasizing precision voltage monitoring, low power, and seamless integration with bidirectional reset architectures.

FAQ

What is the exact reset threshold voltage and accuracy of the MAX6314US30D4?

The MAX6314US30D4 has a factory-trimmed nominal reset threshold of 3.00V, with ±1.8% accuracy at +25°C and ±2.5% over the full -40°C to +85°C operating temperature range. This is achieved via laser-trimmed internal resistors and verified per the Electrical Characteristics table in the official datasheet. The threshold is referenced to VCC and remains stable against supply variations.

Does the MAX6314US30D4 support manual reset, and how is it implemented?

Yes, the MAX6314US30D4 supports manual reset via the MR pin, which is active-low and internally pulled up with a 63kΩ resistor. A logic-low pulse on MR asserts RESET for the full 1120ms timeout period after MR returns high. No external debounce components are needed, and the MR input rejects glitches <100ns, making it robust in noisy environments.

How does the bidirectional RESET output of the MAX6314US30D4 work with microprocessors like the 68HC11?

The MAX6314US30D4's RESET output combines a 4.7kΩ pull-up resistor with a P-channel active pullup transistor and N-channel pulldown. This allows the 68HC11 to pull RESET low to self-assert reset, while the MAX6314US30D4 drives it low during power faults. The 2µs active pullup ensures fast rise time, enabling the µP to sample RESET state within two E-clock cycles to determine reset source.

What is the supply current consumption of the MAX6314US30D4, and how does it vary with temperature?

The MAX6314US30D4 draws 5µA typical supply current at +25°C, rising to ~12µA at +85°C and remaining ~5µA at -40°C (per Typical Operating Characteristics Figure MAX6314-02). This ultra-low quiescent current makes it ideal for battery-powered applications where supervisor current must be minimized over the full industrial temperature range.

Is the MAX6314US30D4 pin-compatible with other supervisors, and what package does it use?

The MAX6314US30D4 uses the SOT143 package (4-pin, gull-wing) and is explicitly stated as pin-compatible with the MAX811 in the datasheet Features section. Pin mapping is identical: VCC (pin 1), GND (pin 4), RESET (pin 2), MR (pin 3). However, functional differences exist-e.g., MAX811 has open-drain RESET and different timeout options-so electrical verification is required before substitution.