X1288S16-4.5A

Overview

The X1288S16-4.5A is a Real-Time Clock (RTC) IC with integrated EEPROM, manufactured by Intersil (now part of Renesas Electronics). It features a 32KB non-volatile memory array and an I2C serial interface for clock/calendar data access. The device operates on a single 4.5V to 5.5V supply voltage and includes battery backup support ranging from 1.8V to 5.5V. Key functional attributes include alarm capabilities, leap year compensation, Y2K compliance, and built-in watchdog timer and SRAM functions. It is housed in a 14-TSSOP surface-mount package.

Feature Summary

• Integrated 32KB EEPROM with I2C interface
• Real-time clock/calendar with alarm and watchdog timer
• Single 4.5V–5.5V supply with 1.8V–5.5V battery backup
• 14-TSSOP surface-mount package

Applications

• Industrial control systems requiring time-stamping
• Data logging equipment with non-volatile storage needs
• Consumer electronics with calendar functionality
• Telecommunications infrastructure timing modules

Procurement Notes

Verify manufacturer lineage as Intersil assets were acquired by Renesas. Confirm RoHS3 compliance status for specific production lots. Check moisture sensitivity level (MSL 5) requirements for reflow soldering profiles. Ensure supply voltage matches system design constraints of 4.5V to 5.5V.

Selection Notes

Select this component when both RTC and significant non-volatile storage are required in a single package. The I2C interface simplifies PCB routing compared to parallel interfaces. Verify that the 14-TSSOP footprint fits the mechanical design. Consider the 10µA–20µA current consumption for battery life calculations if operating in low-power modes.

Part Context

This part belongs to the X1288 series of combined RTC/EEPROM devices. The 'S' suffix typically denotes specific speed or temperature grade variations within the family. As an Intersil product now under Renesas, it represents legacy technology still supported for existing designs. Similar parts may offer different memory sizes or interface speeds.

Replacement Considerations

Direct substitutes include other X1288 variants with compatible pinouts and electrical characteristics. Verify that any replacement maintains the 32KB capacity and I2C protocol compatibility. Cross-reference with Renesas' current portfolio for equivalent combined RTC/EEPROM solutions if obsolescence is a concern.