CD4034BM Datasheet, PDF (10/12 Pages) National Semiconductor (TI) – 8-Stage TRI-STATE Bidirectional Parallel/Serial Input/Output Bus Register

Truth Table
‘‘A’’ Enable P S A B A S Mode
Operation
0
0 0 X Serial Synchronous Serial data input A- and B-Parallel data outputs disabled
0
0 1 X Serial Synchronous Serial data input B-Parallel data output
0
1 0 0 Parallel B Synchronous Parallel data inputs A-Parallel data outputs disabled
0
1 0 1 Parallel B Asynchronous Parallel data inputs A-Parallel data outputs disabled
0
1 1 0 Parallel A-Parallel data inputs disabled B-Parallel data outputs synchronous data recirculation
0
1 1 1 Parallel A-Parallel data inputs disabled B-Parallel data outputs asynchronous data recirculation
1
0 0 X Serial Synchronous Serial data input A-Parallel data output
1
0 1 X Serial Synchronous Serial data input B-Parallel data output
1
1 0 0 Parallel B Synchronous Parallel data input A-Parallel data output
1
1 0 1 Parallel B Asynchronous Parallel data input A-Parallel data output
1
1 1 0 Parallel A Synchronous Parallel data input B-Parallel data output
1
1 1 1 Parallel A Asynchronous Parallel data input B-Parallel data output
X e Don’t Care
For synchronous operation (serial mode or when A S e 0 in parallel mode) outputs change state at positive transition of the clock
10