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SN74HC166D Scheda tecnica(PDF) 1 Page - Texas Instruments |
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SN74HC166D Scheda tecnica(HTML) 1 Page - Texas Instruments |
1 / 9 page SN54HC166, SN74HC166 8-BIT PARALLEL-LOAD SHIFT REGISTERS SCLS117B – DECEMBER 1982 – REVISED MAY 1997 1 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 D Synchronous Load D Direct Overriding Clear D Parallel-to-Serial Conversion D Package Options Include Plastic Small-Outline (D) and Ceramic Flat (W) Packages, Ceramic Chip Carriers (FK), and Standard Plastic (N) and Ceramic (J) 300-mil DIPs description The ’HC166 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. The SN54HC166 is characterized for operation over the full military temperature range of –55 °C to 125°C. The SN74HC166 is characterized for operation from –40 °C to 85°C. Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. 32 1 20 19 910 11 1213 4 5 6 7 8 18 17 16 15 14 H QH NC G F B C NC D CLK INH SN54HC166 ...FK PACKAGE (TOP VIEW) NC – No internal connection 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 SER A B C D CLK INH CLK GND VCC SH/LD H QH G F E CLR SN54HC166 ...J OR W PACKAGE SN74HC166 . . . D OR N PACKAGE (TOP VIEW) Copyright © 1997, Texas Instruments Incorporated PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. |
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