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Real Time Clocks (RTC) IC

IDT real-time clocks (RTC IC) are ultra-low-power clock/date devices with programmable time-of-day alarms and programmable square-wave outputs. These devices offer high noise immunity, low current consumption, 12/24 hour mode of operation, auto correction for leap year and programmable square wave output, making them ideal for a wide range of design applications.

IDT’s real-time clock ICs count seconds, minutes, hours, day, date, month, and year with leap-year compensation valid up to 2100. The devices feature normal and fast-mode I2C interfaces, two time-of-day alarms, an oscillator stop flag, programmable square-wave outputs that default to 32 kHz on power-up, and operating voltages ranging from 1.8 to 5.5 V. The IDT 1338 real time clock IC includes a 56-Byte battery-backed non volatile RAM for data storage.

About Real-Time Clocks (RTC IC)
A real-time clock IC (RTC IC) is an integrated circuit that keeps track of the current time and date, typically counting seconds, minutes, hours, day, month, and year with leap-year compensation. Although the term often refers to the devices in personal computers, servers and embedded systems, real-time clock ICs are present in almost any electronic device which needs to keep accurate time. Most of IDT's real-time clocks use an external crystal oscillator, but some contain an integrated oscillator to simplify the circuit and reduce the bill-of-materials (BOM). Most often, the oscillator's frequency is 32.768 kHz, or, exactly 2^15 cycles per second; making it a convenient rate to use with binary counter circuits.


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Outputs (#)Output TypeOutput Freq Range (kHZ)Input TypeAdvanced Features
1337AG Datasheet1337AG - Block Diagram1337AG
Real-Time Clock With I2C Ser...
1LVCMOS0.001, 4.096, 8.192, 32.768Crystal, None (Internal)
1338 Datasheet1338 - Block Diagram1338
Real-Time Clock With Battery...
1LVCMOS0.001, 4.096, 8.192, 32.768Crystal, None (Internal)56-Byte NV RAM
1339 Datasheet1339 - Block Diagram1339
Real-Time Clock With Serial ...
1LVCMOS0.001, 4.096, 8.192, 32.768Crystal, None (Internal)