Diodes Incorporated PT7C4363BWEX

Overview

PT7C4363BWEX from Diodes Incorporated is a real-time clock (RTC) module with I²C interface, 32.768 kHz crystal oscillator, alarm/timer functions, programmable square-wave output (1 Hz to 32.768 kHz), and oscillator fail detection - used in industrial HMIs, medical data loggers, and smart metering systems requiring accurate timekeeping under wide temperature (-40°C to +85°C) and low-voltage (1.3 V to 5.5 V) operation.

For engineers reviewing the PT7C4363BWEX datasheet, PT7C4363BWEX pinout, PT7C4363BWEX application, or PT7C4363BWEX equivalent, key selection criteria include I²C-compatible timing accuracy, open-drain interrupt/square-wave outputs, standby current ≤700 nA at 5 V, century-bit calendar support, and RoHS-compliant 8-SOIC (W) packaging.

Technical Context

The PT7C4363BWEX implements a fully integrated RTC with BCD-coded time/calendar registers (seconds to years, including century bit), dual interrupt sources (alarm and timer), and independent control of oscillator enable/disable and time count chain stop. Its I²C slave address is fixed at 0xA2 (write) / 0xA3 (read), supporting standard-mode (100 kHz) and fast-mode (400 kHz) bus speeds.

It features hardware-level oscillator fail detection (OSF flag), external crystal test mode (TEST1), power-on reset override (TESTC), and configurable square-wave output frequencies selected via RS1/RS0 bits - all managed through eight dedicated control/status registers mapped across I²C address space 0x00–0x0F.

Key Specifications

Pinout & Package

PT7C4363BWEX is housed in an 8-pin SOIC (W) package (JEDEC MS-012AC, 3.9 mm × 4.9 mm, 1.27 mm pitch), optimized for surface-mount assembly and thermal performance in compact industrial PCBs.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar real-time clock applications.

Compared with DS3231M and PCF8563, PT7C4363BWEX uniquely balances I²C simplicity, century-bit calendar, oscillator health monitoring, and sub-1 µA standby - making it optimal for cost-sensitive, long-lifecycle industrial controllers needing robust time integrity without TCXO expense.

Availability

PT7C4363BWEX is available at Aetrix Electronics and suitable for industrial data loggers, smart energy meters, medical wearables, and building automation controllers requiring stable component supply, long-term lifecycle support, and RoHS-compliant 8-SOIC packaging.

Supply support for PT7C4363BWEX 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

Diodes Incorporated is a global semiconductor company specializing in discrete, analog, and mixed-signal ICs, with design centers across Asia, Europe, and the US, serving industrial, computing, communications, and consumer markets.

The PT7C4363BWEX belongs to Diodes' precision timing product line, engineered for high-reliability embedded systems requiring accurate, low-power, and feature-rich RTC functionality in harsh environmental conditions.

FAQ

What crystal specifications are required for PT7C4363BWEX?

The PT7C4363BWEX requires a 32.768 kHz tuning-fork crystal with 12.5 pF load capacitance, series resistance ≤100 kΩ, and stability over –40°C to +85°C. External capacitor C1 ≈ 20 pF must be placed between X1 and GND; X2 connects directly to the crystal with no external cap. Built-in CG (5 pF) and CD (20 pF) capacitors are factory-trimmed to minimize layout sensitivity.

How does oscillator fail detection (OSF) operate in practice?

OSF (Oscillator Stop Flag) is bit 7 of the seconds register (0x02). It is set automatically when the crystal stops oscillating - e.g., due to breakage, solder fatigue, or extreme temperature excursion. The flag persists until cleared by software write; reading OSF = 1 mandates time reinitialization and crystal health verification before resuming time-critical operations.

Can PT7C4363BWEX generate a 1 Hz interrupt without using the SQW pin?

Yes. The INT pin can deliver a 1 Hz interrupt by configuring the timer with TD1/TD0 = 11 (1/60 Hz source) and Timer register = 0x3C (60 decimal), then enabling TIE and setting TI/TP = 0. This produces a level-active INT signal synchronized to the 1 Hz boundary - independent of SQW pin usage or configuration.

Is the PT7C4363BWEX pin-compatible with earlier PT7C4363B variants?

Yes. PT7C4363BWEX shares identical pinout, electrical characteristics, register map, and I²C protocol with the base PT7C4363B. The "WEX" suffix denotes tape-and-reel packaging per JEDEC standard and RoHS 3 compliance (2015/863/EU); no functional or mechanical differences exist versus non-"EX" W-package versions.