ISL12028IVAZ

Description：IC RTC CLK/CALENDAR I2C 14TSSOP
Series：-

SKU:27d8e96e11c4 Category: Real Time Clocks Brand: Renesas Electronics Corporation

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Product introduction

ISL12028IVAZ is listed in the Real Time Clock range at ChipApex. The manufacturer field lists Renesas Electronics Corporation. Its product description is IC RTC CLK/CALENDAR I2C 14TSSOP. Review the specifications below when checking this part for your BOM.

Real Time Clock specifications for ISL12028IVAZ

Description：IC RTC CLK/CALENDAR I2C 14TSSOP
Series：-
Package：Tube
Mfr：Renesas Electronics Corporation
Type：Clock/Calendar
Features：Alarm, Leap Year, Supervisor, Watchdog Timer
Memory Size：-
Time Format：HH:MM:SS (12/24 hr)
Date Format：YY-MM-DD-dd
Interface：I2C, 2-Wire Serial
Voltage - Supply：2.7V ~ 5.5V
Voltage - Supply, Battery：1.8V ~ 5.5V
Current - Timekeeping (Max)：10µA ~ 20µA @ 2.7V ~ 5.5V
Operating Temperature：-40°C ~ 85°C
Mounting Type：Surface Mount
Package / Case：14-TSSOP (0.173", 4.40mm Width)
Supplier Device Package：14-TSSOP

Real Time Clock datasheet and documents for ISL12028IVAZ

ISL12028IVAZ

Real Time Clock Overview

The ISL12028IVAZ is a low-power real-time clock/calendar integrated circuit manufactured by Renesas Electronics. It features an I2C bus interface, two non-volatile alarms, and 512x8-bit EEPROM with BlockLock protection. The device operates on a main supply (VDD) of 2.7V to 5.5V and a backup supply (VBAT) of 1.8V to 5.5V. Battery supply current is typically 800nA at 1.8V VBAT. It includes CPU supervisor functions such as Power-On Reset, Low Voltage Sense, and a Watchdog Timer. The oscillator uses an external 32.768kHz crystal with on-chip compensation.

Real Time Clock Feature Summary

Real-Time Clock/Calendar with automatic leap year correction through 2099
Two non-volatile alarms with periodic interrupt capability
512x8-bit EEPROM with 8 modes of BlockLock protection
On-chip oscillator compensation with 64-position digital trim

Real Time Clock Applications

Utility Meters
HVAC Equipment
Network Routers, Hubs, Switches, Bridges
POS Equipment
Computer Products

Real Time Clock Procurement Notes

Verify component status before procurement. The datasheet identifies the ISL12028 series as obsolete with no recommended replacement. Confirm availability through authorized distributors or secondary markets, as standard manufacturing support may be discontinued.

Real Time Clock Selection Notes

Select the ISL12028IVAZ for TSSOP-14 package requirements. Ensure VBAT > VDD conditions are met if using legacy mode settings, or consider the ISL12028A variant for standard mode applications where VBAT exceeds VDD. Verify I2C bus compatibility and pull-up resistor values for the target voltage level.

Real Time Clock Part Context

The ISL12028IVAZ belongs to the ISL12028 family of real-time clocks. It is distinct from the ISL12028A variant, which utilizes Standard Mode power control settings compared to the Legacy Mode of the ISL12028. Both variants share similar core functionalities but differ in battery switching behavior.

Real Time Clock Replacement Considerations

The datasheet explicitly states this product is obsolete with no recommended replacement. Contact Technical Support for potential alternatives or end-of-life management options.

Real Time Clock FAQ

What is the default setting for the Battery Switching (BSW) bit in the ISL12028?

The BSW bit defaults to 1 (Legacy Mode) for the ISL12028. This requires VDD < VBAT for proper operation.

How does the device handle time reading to prevent errors during updates?

The clock is latched by the read command (falling edge of the clock on the ACK bit) into a separate latch to avoid time changes during the read operation, while the clock continues to run.