The LS395 is a 4-bit shift register with TRI-STATE outputs and can operate in either a synchronous parallel load or a serial shift-right mode as determined by the Select input An asynchronous active LOW Master Reset (MR) input overrides the synchronous operations and clears the register An active LOW Output Enable (OE) input controls the TRISTATE output buffers but does not interfere with the other operations The fourth stage also has a conventional output for linking purposes in multi-stage serial operations