PT7C4337WEX

Real Time Clock Overview

The PT7C4337WEX is a Real-Time Clock (RTC) module manufactured by Diodes Incorporated, housed in an 8-pin SOIC package. It operates on a 2-wire I2C bus interface with a supply voltage range of 1.8V to 5.5V and timekeeping capability down to 1.2V. The device supports both 12-hour and 24-hour time formats, tracks days of the week, dates, months, and years, and includes leap year compensation. Key features include two programmable alarms, an oscillator stop flag, and a programmable square wave output. It requires an external 32.768kHz crystal.

Real Time Clock Feature Summary

• I2C Bus Interface: Supports standard mode up to 400 kHz for efficient communication with host microcontrollers.
• Dual Alarm System: Features two independent alarm registers (Alarm 1 and Alarm 2) with mask bits to trigger interrupts at various intervals.
• Low Power Consumption: Timekeeping current is typically 450nA at 1.8V-3.6V; data retention current is under 160nA when the oscillator is disabled.
• Oscillator Control: Includes built-in oscillator enable/disable functionality and an oscillator fail detect (OSF) flag.

Real Time Clock Applications

• Industrial control systems requiring precise time stamping
• Embedded devices needing low-power real-time tracking
• Consumer electronics utilizing I2C-based architectures

Real Time Clock Procurement Notes

Verify the specific package variant, as the 'W' suffix denotes an 8-pin SOIC. Confirm RoHS compliance status via official documentation. Ensure external pull-up resistors are included for SDA and SCL lines, as the pins are open-drain outputs. Check that the design accommodates the required 32.768kHz crystal and associated load capacitors.

Real Time Clock Selection Notes

Select this component if an I2C-compatible RTC with dual alarms and low standby current is required. Ensure the system voltage falls within the 1.8V to 5.5V operating range. Consider the 8-SOIC footprint constraints. Verify that the host controller supports the necessary I2C timing parameters, such as setup and hold times for start/stop conditions.

Real Time Clock Part Context

The PT7C4337 series is part of Diodes Incorporated's portfolio of clock and timer ICs. The 'WEX' designation indicates the 8-SOIC package configuration supplied in tape and reel format. This model is designed for applications where space efficiency and low power consumption are critical, leveraging the standard I2C protocol for simplified integration.

Real Time Clock Replacement Considerations

Direct replacements must match the I2C interface, pinout, and register map. Verify voltage compatibility across the full operating temperature range (-40°C to +85°C). Ensure any substitute supports the same alarm configurations and square wave output frequencies (1Hz, 4.096kHz, 8.192kHz, 32.768kHz).