Diodes Incorporated
Back to Real Time Clock (RTC)


I2C interface RTC with digital clock precision adjustment function

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Product Description

PT7C4372A/C are I2C bus interface-compliant real-time clocks that have been adjusted for high precision. In addition to providing a function for generating six types of interrupts, a dual alarm function, an oscillation stop detection function (used to determine presence of valid internal data at power-on), they includes a digital clock precision adjustment function that can be used to set various levels of precision. Since the internal oscillation circuit is driven at a constant voltage, 32-kHz clock output is stable and free of voltage fluctuation effects. Table 1 shows the diverse functions of the two RTC circuits. More details are shown in section Overview of functions.

Product Features

• External quartz oscillator 32.000kHz and 32.768kHz selectable.
• Supports I2C-Bus's high speed mode (400 kHz)
• Includes time (Hour/Minute/Second) and calendar (Year/Month/Date/Day) counter functions (BCD code)
• Select between 12-hr and 24-hr clock display
• Auto calculation of leap years until 2099
• Built-in high-precision clock precision control logic
• Interrupt generation function (cycle time range: 1 month to 0.5 seconds, includes interrupt flags and interrupt stop function)
• Alarm functions (Alarm_A: Day/Hour/Min)
• 32-kHz clock output (/INTB output)
• Oscillation stop detection function (used to determine presence of internal data)
• Wide Time keeping voltage range: 1.3 V to 6 V
• Wide interface voltage range: 1.8 V to 6 V
• Low current consumption: 0.4 μA/3.0 V (Typ.)


Product Specifications

Product Parameters

Compliance(Only Automotive supports PPAP) Standard
Time Display 12, 24
Interface I2C
Alarm Interrupt 1
Battery Backup 0
Clock Calibration 1

Technical Documents

Recommended Soldering Techniques


Additional Technical Documents are available upon request:
Application information, Evaluation board, and Other technical documents

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Product Change Notices (PCNs)

A PCN may only apply to specific orderable part numbers in this datasheet. Please refer to the corresponding PCN to see the exact orderable part number(s) affected.

PCN # Issue Date Implementation Date Subject
PCN-2651 2023-11-13 2023-11-13 Qualified Additional Fab Source, Assembly Test Sites, Die Revision, BOM, Datasheet, Tape and Reel Packing Quantity.
PCN-2510 2021-02-26 2021-05-26 Qualified Additional A/T Sites, Fab Site and Data Sheet Change
PCN-2481 2020-08-26 2021-02-26 Device End of Life (EOL)


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