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4-bit bidirectional universal shift register

74HC1944-bit bidirectional universal shift registerRev. 4 16 March 2021 Product data sheet1. General descriptionThe 74HC194 is a 4-bit bidirectional universal shift register . The synchronous operation of thedevice is determined by the mode select inputs (S0, S1). In parallel load mode (S0 and S1 HIGH)data appearing on the D0 to D3 inputs, when S0 and S1 are HIGH, is transferred to the Q0 to Q3outputs. When S0 is HIGH and S1 is LOW data is entered serially via DSL and shifted from leftto right; when S0 is LOW and S1 is HIGH data is entered serially via DSR and shifted from rightto left.

parallel load operation. If both S0 and S1 are LOW, existing data is retained in a hold mode. Mode select and data inputs are edge-triggered, responding only to the LOW-to-HIGH transition of the clock (CP). Therefore, the only timing restriction is …

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