Reddit reviews SunFounder PCF8563 IIC I2C Real Time Clock RTC and DS18B20 Temperature Sensor Module for Arduino Raspberry Pi
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Integrates RTC PCF8563 and DS18B20 temperature sensor.Provides battery backup for continuous timekeeping; Low power consumption.Complete clock calendar functions include second, minute, hour, day, date, month and year timekeeping, which provides valid time until the year 2100 with leap year compensation.Supports PCF8563 I2C output and DS18B20 digital output, so you just plug the ports into Raspberry Pi to use.Working voltage: 3.3V; Dimensions: approx. 14*13*15mm/0.55*0.51*0.59’’.
I couldn't get mine to stabilize the waveform above 5MHz. I found the synthetic clock on my unit could skip forward or backward equal to unity. You can either bung together your own circuit with a 5th generation cut quartz module or simply pick up an external RTC and attach it to your GPIO pins like this one.
Otherwise, you can clock off the output if you slice your optocouplers and introduce a prismatic retroreflector for signaling. I like the RCN-15-11.3 for this purpose.