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SN74HC259D Folha de dados(PDF) 2 Page - Texas Instruments |
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SN74HC259D Folha de dados(HTML) 2 Page - Texas Instruments |
2 / 19 page SN54HC259, SN74HC259 8BIT ADDRESSABLE LATCHES SCLS134E − DECEMBER 1982 − REVISED SEPTEMBER 2003 2 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 description/ordering information (continued) Four distinct modes of operation are selectable by controlling the clear (CLR) and enable (G) inputs. In the addressable-latch mode, data at the data-in terminal is written into the addressed latch. The addressed latch follows the data input, with all unaddressed latches remaining in their previous states. In the memory mode, all latches remain in their previous states and are unaffected by the data or address inputs. To eliminate the possibility of entering erroneous data in the latches, G should be held high (inactive) while the address lines are changing. In the 1-of-8 decoding or demultiplexing mode, the addressed output follows the level of the D input with all other outputs low. In the clear mode, all outputs are low and unaffected by the address and data inputs. Function Tables FUNCTION INPUTS OUTPUT OF ADDRESSED EACH OTHER FUNCTION CLR G ADDRESSED LATCH OTHER OUTPUT FUNCTION H L D QiO Addressable latch H HQiO QiO Memory L LD L 8-line demultiplexer L H L L Clear LATCH SELECTION SELECT INPUTS LATCH S2 S1 S0 LATCH ADDRESSED L L L 0 L LH 1 L HL 2 L HH 3 H LL 4 H LH 5 H HL 6 H H H 7 |
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