PT7C4337AWE

Real Time Clock Overview

The PT7C4337A is a Real-time Clock (RTC) module manufactured by Diodes Incorporated. It features an I2C bus interface and supports both 12-hour and 24-hour time formats with a century bit. The device requires an external 32.768kHz crystal connected to X1 and X2 pins. Operating voltage ranges from 1.2V to 5.5V, with a recommended supply of 1.8V to 5.5V. Key electrical parameters include a maximum active current of 150µA at 3.6V–5.5V and a typical timekeeping current of 450nA at 1.3V–1.8V. The component is marked as obsolete.

Real Time Clock Feature Summary

• I2C Bus Interface: Supports standard communication up to 400 kHz.
• Dual Alarms: Features two independent alarm registers with programmable mask bits for various repetition rates.
• Programmable Square Wave: Outputs selectable frequencies of 1Hz, 4.096kHz, 8.192kHz, or 32.768kHz.
• Oscillator Control: Includes oscillator enable/disable functionality and an oscillator stop flag (OSF).

Real Time Clock Applications

• Multimedia advertising machine timing systems
• General embedded real-time clock applications

Real Time Clock Procurement Notes

This part number is officially designated as obsolete by the manufacturer. Customers are required to use the replacement parts RT3A3240N3 or RT3A3241N instead. Verification of the specific package suffix (e.g., WEX for SOIC-8) is necessary when sourcing legacy inventory or evaluating substitutes.

Real Time Clock Selection Notes

Select the PT7C4337A only if legacy compatibility is strictly required, noting its obsolete status. For new designs, utilize the specified replacements RT3A3240N3 or RT3A3241N. Ensure the design accommodates an external 32.768kHz crystal and provides appropriate pull-up resistors for the SDA, SCL, INTA, and SQW/INTB open-drain pins.

Real Time Clock Part Context

The PT7C4337A belongs to the PT7C4337 series of RTC modules. It is functionally similar to the PT7C4337AC, which integrates the crystal oscillator internally, whereas the PT7C4337A requires an external crystal. Both share identical register maps and I2C interfaces.

Real Time Clock Replacement Considerations

The datasheet explicitly states to use RT3A3240N3 and RT3A3241N as replacements for this obsolete part.

Real Time Clock FAQ

Does the PT7C4337A have an integrated crystal?

No, the PT7C4337A requires an external 32.768kHz crystal connected between the X1 and X2 pins. The PT7C4337AC variant includes an integrated crystal.

What is the maximum I2C clock frequency?

The maximum SCL clock frequency is 400 kHz.

How many alarm interrupts does the device support?

It supports two independent alarms (Alarm 1 and Alarm 2), which can be routed to the INTA and SQW/INTB pins via the INTCN control bit.