PT7C433833WE

Real Time Clock Overview

The PT7C433833WE is a Real-time Clock Module manufactured by Diodes Incorporated, utilizing an I2C bus interface for communication. It provides timekeeping functions including seconds, minutes, hours, days of the week, dates, months, and years in BCD format. The device supports both 12-hour and 24-hour display modes and includes a power-fail detection circuit that automatically switches to a backup supply when VCC drops below the power-fail voltage (VPF). Key electrical parameters include a supply voltage range of 2.7V to 5.5V, a battery voltage range of 1.5V to 3.7V, and an operating temperature range of -40°C to +85°C. It features 56 bytes of static RAM and a programmable square wave output.

Real Time Clock Feature Summary

• I2C Bus Interface: Supports standard mode (up to 100 kHz) and fast mode (up to 400 kHz) with open-drain SDA and SCL pins requiring external pull-up resistors.
• Time and Calendar Counters: Counts seconds, minutes, hours, day of the week, date, month, and year with automatic leap-year correction; supports 12/24 hour formats.
• Power Management: Includes power-fail detection circuitry for seamless switching between main supply (VCC) and backup supply (VBAT); low standby current typical of 85 µA at VCC.
• Oscillator Features: Internal oscillator designed for a 32.768kHz crystal with 12.5pF load capacitance; includes oscillator enable/disable control and an oscillator stop flag (OSF).

Real Time Clock Applications

• Embedded systems requiring precise timekeeping and calendar tracking.
• Data logging devices needing non-volatile memory access via I2C.
• Battery-powered equipment utilizing backup power switching capabilities.

Real Time Clock Procurement Notes

Verify the specific package variant required, as the datasheet lists the 8-pin MSOP (PT7C433833UEX) as the primary packaged option. Confirm RoHS compliance status and lead-free definitions if environmental regulations apply to the end product. Ensure ordering suffixes match the desired tape and reel or cut tape packaging configuration provided by the distributor.

Real Time Clock Selection Notes

Select this component when an I2C-compatible real-time clock with integrated SRAM is needed. Ensure the system design accommodates the 2.7V to 5.5V VCC range and provides appropriate pull-up resistors for the I2C lines. Verify that the external crystal matches the 12.5pF load capacitance requirement for accurate timing. Consider the 56-byte RAM capacity for data storage needs.

Real Time Clock Part Context

The PT7C433833 series belongs to the family of Real-time Clock Modules from Diodes Incorporated (formerly Pericom Semiconductor). These devices are designed to provide low-power timekeeping solutions for microcontroller-based systems. The '33' suffix typically denotes specific feature sets such as the inclusion of SRAM and specific pin configurations compared to other variants in the PT7C433x line.

Real Time Clock Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided source material. Engineers should consult official cross-reference guides or manufacturer documentation for verified alternatives.