Real-time clocks integrate a power switch for battery use

Epson’s RX8130CE and RX8900CE real-time clocks (RTCs) are available from distributor Rutronik.

Both new modules are available in 3.2 x 2.5 x 1.0mm packages and include an IC and crystal.

The RX8130CE is designed for low power and has a built-in power switch function optimised for rechargeable batteries and achieving an accuracy of 5 ±23 ppm at 25°C.

It is designed for the use of any power source including a discharging battery as primary supply.

The RX8900CE module uses digital processing temperature compensated crystal oscillator (DTCXO) technology to achieve ±5 or ±3.4 ppm accuracy over the entire -40 to +85°C operating range.

Its power is 700nA, which is three times lower than that of competing DTCXO RTCs.