Analog Devices Inc./Maxim Integrated MAX6314US47D2+T

Overview

MAX6314US47D2+T from Maxim Integrated is a low-power CMOS microprocessor supervisory circuit with factory-trimmed 4.7V reset threshold, 20ms minimum reset timeout period, bidirectional RESET output, SOT143 package, and ±2.5% threshold accuracy over temperature. It monitors VCC in embedded controllers and portable equipment to prevent code-execution errors during power-up, brownout, or power-down.

For engineers reviewing the MAX6314US47D2+T datasheet, MAX6314US47D2+T pinout, MAX6314US47D2+T application, or MAX6314US47D2+T equivalent, key selection criteria include bidirectional reset compatibility with 68HC11-style µPs, internal 4.7kΩ pullup + active P-channel pullup for fast rise time under capacitive load, manual reset input with 63kΩ internal pullup, and immunity to sub-1µs VCC transients.

Technical Context

The MAX6314US47D2+T implements a precision voltage-monitoring comparator with laser-trimmed resistive divider to detect VCC falling below 4.7V ±2.5%, triggering a reset assertion that persists for ≥20ms after VCC recovers. Its RESET output combines an N-channel pulldown, 4.7kΩ passive pullup, and P-channel active pullup enabled for 2µs upon rising-edge detection at 0.5V.

Manual reset (MR) is debounced internally via transition flip-flop logic and supports direct switch-to-GND connection without external RC components. The device operates across -40°C to +85°C with 5µA typical supply current at +25°C and remains functional down to VCC = 1.0V, guaranteeing RESET low state under valid operating conditions.

Key Specifications

Pinout & Package

SOT143 package: 4-pin, surface-mount, lead-free (RoHS-compliant), 1.3mm × 2.1mm footprint, -40°C to +85°C industrial temperature range.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6314US47D2+T, MAX6315US47D2+T lacks bidirectional capability and needs external pullup, while TPS3808G33DBVR offers lower current but cannot monitor 4.7V rails - making MAX6314US47D2+T uniquely suited for 5V µP systems requiring robust, self-contained bidirectional reset signaling.

Availability

MAX6314US47D2+T is available at Aetrix Electronics and suitable for industrial controllers, portable medical devices, automotive body control modules, and smart energy meters requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MAX6314US47D2+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 industrial, automotive, communications, and computing applications.

The MAX6314 series delivers cost-effective, pin-compatible µP supervision with factory-trimmed thresholds and bidirectional reset - engineered specifically for reliability-critical embedded systems where external component count and reset timing integrity are paramount.

FAQ

What is the exact reset threshold voltage and tolerance for MAX6314US47D2+T?

The MAX6314US47D2+T has a nominal reset threshold of 4.70V, with ±2.5% accuracy over the full operating temperature range (-40°C to +85°C). This specification is factory-laser-trimmed and confirmed in the Electrical Characteristics table of the official datasheet. At +25°C, the tighter ±1.8% tolerance applies. The threshold is referenced directly to the VCC pin via an internal precision divider, ensuring consistent behavior across supply variations.

Does MAX6314US47D2+T support bidirectional reset communication with microcontrollers like the 68HC11?

Yes, MAX6314US47D2+T is explicitly designed for bidirectional reset interfaces. Its RESET pin integrates both an N-channel pulldown and a parallel 4.7kΩ pullup plus P-channel active pullup, enabling µPs such as the Motorola 68HC11 to assert reset themselves while still recognizing external reset assertions. This architecture ensures reliable reset-source discrimination within tight timing windows, even with multiple devices sharing the reset bus.

What is the minimum reset timeout period for MAX6314US47D2+T, and how is it guaranteed?

The MAX6314US47D2+T provides a minimum reset timeout period of 20ms, as indicated by the "D2" suffix in the part number. This value is internally programmed and guaranteed over temperature and voltage - the datasheet specifies 20ms (min), 28ms (typ), and 40ms (max) at -40°C to +85°C. The timer starts only after VCC rises above the 4.7V threshold or MR is deasserted, ensuring deterministic release timing critical for system stability.

Can MAX6314US47D2+T operate reliably at low supply voltages, and what happens to RESET below 1V?

MAX6314US47D2+T functions down to VCC = 1.0V, guaranteeing RESET remains low in that range. Below 1.0V, the internal output stage disables and RESET becomes high-impedance - not actively driven. In applications requiring valid RESET down to 0V, a 100kΩ external pull-down resistor is recommended per the datasheet's Figure 3 to prevent floating states. This behavior ensures safe operation during deep brownout without unintended logic transitions.

Is manual reset (MR) debounced internally in MAX6314US47D2+T, and what is its input threshold?

Yes, MAX6314US47D2+T includes fully internal debounce for the MR pin using a transition flip-flop with 100ns glitch rejection. No external RC network is needed. The MR input threshold is defined as VIL ≤ 0.3×VCC and VIH ≥ 0.7×VCC, compatible with standard CMOS logic families across the full 1.0V–5.5V supply range. An internal 63kΩ pullup resistor allows MR to be left unconnected when unused, simplifying PCB layout and reducing BOM count.