Abstract: Disclosed is a device for automatically synchronizing incoming digital data with a local clock. Incoming clock pulses are compared with the local clock pulses after being delayed by a sufficient amount to produce synchronization between the incoming and local clock pulses. The incoming data pulses are delayed by the same amount as the incoming clock pulses so that they too are synchronized with the local clock. Both digital delays are variable and may be used to provide both fractional clock period delays or multiple clock period delays for accurate synchronization over a relatively long communications cycle.