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SN74HC166DR Datasheet(PDF) 2 Page - Texas Instruments |
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SN74HC166DR Datasheet(HTML) 2 Page - Texas Instruments |
2 / 34 page SN54HC166, SN74HC166 8BIT PARALLELLOAD SHIFT REGISTERS SCLS117D − DECEMBER 1982 − REVISED SEPTEMBER 2003 2 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 description/ordering information (continued) These parallel-in or serial-in, serial-out registers feature gated clock (CLK, CLK INH) inputs and an overriding clear (CLR) input. The parallel-in or serial-in modes are established by the shift/ load (SH/LD) input. When high, SH/LD enables the serial (SER) data input and couples the eight flip-flops for serial shifting with each clock (CLK) pulse. When low, the parallel (broadside) data inputs are enabled, and synchronous loading occurs on the next clock pulse. During parallel loading, serial data flow is inhibited. Clocking is accomplished on the low-to-high-level edge of CLK through a 2-input positive-NOR gate, permitting one input to be used as a clock-enable or clock-inhibit function. Holding either CLK or CLK INH high inhibits clocking; holding either low enables the other clock input. This allows the system clock to be free running, and the register can be stopped on command with the other clock input. CLK INH should be changed to the high level only when CLK is high. CLR overrides all other inputs, including CLK, and resets all flip-flops to zero. FUNCTION TABLE INPUTS OUTPUTS INPUTS INTERNAL CLR SH/LD CLK INH CLK SER PARALLEL A...H QA QB QH L X X X X X L L L H XL L X X QA0 QB0 QH0 H LL ↑ X a ...h a bh H HL ↑ HX H QAn QGn H HL ↑ LX L QAn QGn H X H ↑ X X QA0 QB0 QH0 logic diagram (positive logic) 1D C1 15 9 7 6 13 SH/LD CLR CLK CLK INH QH 234 5 10 11 12 14 SER AB CD E F G H R 1D C1 R 1D C1 R 1D C1 R 1D C1 R 1D C1 R 1D C1 R 1D C1 R 1 Pin numbers shown are for the D, DB, J, N, NS, PW, and W packages. |
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