DS1307Z/T&R

Real Time Clock Overview

The DS1307Z+T&R is a low-power serial real-time clock (RTC) and calendar integrated circuit manufactured by Analog Devices Inc./Maxim Integrated. It provides seconds, minutes, hours, day, date, month, and year information with automatic leap-year compensation valid up to the year 2100. The device features 56 bytes of battery-backed NV SRAM for general-purpose data storage. It communicates via an I2C bidirectional bus operating at a maximum clock frequency of 100 kHz. The part operates within a supply voltage range of 4.5V to 5.5V and supports a backup supply voltage of 2.0V to 3.5V. It is housed in an 8-pin SOIC package and is rated for commercial operation from 0°C to +70°C.

Real Time Clock Feature Summary

• Full BCD clock/calendar with automatic leap-year correction valid through 2100.
• 56-byte battery-backed NV SRAM with unlimited write cycles.
• I2C serial interface supporting standard mode (100 kHz).
• Built-in power-fail detect circuitry for automatic switching to backup supply.

Real Time Clock Applications

• Data logging systems requiring precise timestamping.
• Consumer electronics needing calendar and timekeeping functions.
• Industrial control systems utilizing I2C communication protocols.

Real Time Clock Procurement Notes

Verify that the specific order corresponds to the 'DS1307Z' suffix, which indicates the commercial temperature range (0°C to +70°C). Confirm the '+T&R' designation matches the required tape and reel packaging format. Ensure the component is lead-free/RoHS-compliant as indicated by the '+' suffix. Cross-reference the manufacturer part number with authorized distributor catalogs to confirm current availability status.

Real Time Clock Selection Notes

Select this component when an I2C interface is preferred over SPI or parallel connections for RTC functionality. The DS1307Z+T&R is suitable for applications requiring 56 bytes of non-volatile memory alongside timekeeping. For industrial temperature ranges (-40°C to +85°C), the DS1307ZN+T&R variant must be selected instead. Ensure the design includes a 32.768kHz crystal with a 12.5pF load capacitance connected to X1 and X2 pins.

Real Time Clock Part Context

This part belongs to the DS1307 family of serial real-time clocks. The 'Z' suffix denotes the 8-pin SOIC package and commercial temperature rating. The '+T&R' suffix specifies the tape and reel packaging option for automated surface-mount assembly. This distinguishes it from the DIP package variants (e.g., DS1307+) and the industrial temperature grade parts (e.g., DS1307ZN+).

Real Time Clock Replacement Considerations

For industrial temperature requirements, use DS1307ZN+T&R. For DIP packaging, consider DS1307+. Direct pin-compatible replacements should be verified against updated datasheets for I2C address compatibility and voltage specifications.