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93L00FMQB Datasheet(PDF) 4 Page - National Semiconductor (TI) |
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93L00FMQB Datasheet(HTML) 4 Page - National Semiconductor (TI) |
4 / 8 page Functional Description The Logic Diagrams and Truth Table indicate the functional characteristics of the 93L00 4-bit shift register The device is useful in a wide variety of shifting counting and storage applications It performs serial parallel serial-to-parallel or parallel-to-serial data transfers The 93L00 has two primary modes of operation shift right (Q0 xQ1) and parallel load which are controlled by the state of the Parallel Enable (PE) input When the PE input is HIGH serial data enters the first flip-flop Q0 via the J and K inputs and is shifted one bit in the direction Q0 xQ1xQ2xQ3 following each LOW-to-HIGH clock transition The JK inputs provide the flexibility of the JK type input for special applications and the simple D-type input for general applications by tying the two pins together When the PE input is LOW the 93L00 appears as four com- mon clocked D flip-flops The data on the parallel inputs P0 – P3 is transferred to the respective Q0 – Q3 outputs fol- lowing the LOW-to-HIGH clock transition Shift left opera- tion (Q3 xQ2) can be achieved by tying the Qn outputs to the Pnb1 inputs and holding the PE input LOW All serial and parallel data transfers are synchronous occur- ing after each LOW-to-HIGH clock transition Since the 93L00 utilizes edge triggering there is no restriction on the activity of the J K Pn and PE inputs for logic operationex- cept for the setup and release time requirements A LOW on the asynchronous Master Reset (MR) input sets all Q out- puts LOW independent of any other input condition Truth Table Operating Inputs (MR e H) Outputs tna1 Mode PE JK P0 P1 P2 P3 Q0 Q1 Q2 Q3 Q3 H L L X X X X L Q0 Q1 Q2 Q2 Shift Mode H L H X X X X Q0Q0Q1Q2Q2 H H L XXXX Q0Q0Q1Q2Q2 H H H X X X X H Q0 Q1 Q2 Q2 Parallel L X X L L L L L L L L H Entry Mode L X X H H H H H H H H L tna1 e Indicates state after next LOW-to-HIGH clock transition H e HIGH Voltage Level L e LOW Voltage Level X e Immaterial 4 |
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