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SN74ALS992DW 데이터시트(PDF) 1 Page - Texas Instruments |
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SN74ALS992DW 데이터시트(HTML) 1 Page - Texas Instruments |
1 / 6 page SN74ALS992 9-BIT D-TYPE TRANSPARENT READ-BACK LATCH WITH 3-STATE OUTPUTS SDAS028B – APRIL 1984 – REVISED JANUARY 1995 Copyright © 1995, Texas Instruments Incorporated 1 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 • 3-State I/O-Type Read-Back Inputs • Bus-Structured Pinout • True Logic Outputs • Designed With Nine Bits for Parity Applications • Package Options Include Plastic Small-Outline (DW) Packages and Standard Plastic (NT) 300-mil DIPs description This 9-bit latch is designed specifically for storing the contents of the input data bus and providing the capability of reading back the stored data onto the input data bus. In addition, this device provides a 3-state buffer-type output and is easily implemented in parity applications. The nine latches are transparent D-type latches. While the latch-enable (LE) input is high, the Q outputs follow the data (D) inputs. The Q outputs are in the 3-state condition when the output-enable (OEQ) input is high. Read back is provided through the output-enable (OERB) input. When OERB is taken low, the data present at the output of the data latches is allowed to pass back onto the input data bus. When OERB is taken high, the output of the data latches is isolated from the D inputs. OERB does not affect the internal operation of the latches; however, precautions should be taken not to create a bus conflict. The SN74ALS992 is characterized for operation from 0 °C to 70°C. logic symbol† C1 13 LE 2D 3 3D 4 4D 5 5D 6 6D 7 7D 8 8D 9 2 5Q 19 6Q 18 7Q 17 8Q 16 2Q 22 3Q 21 4Q 20 1Q 23 1D 2 1D R 11 CLR EN2 1 OERB EN3 14 OEQ 3 9D 10 9Q 15 † This symbol is in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12. DW OR NT PACKAGE (TOP VIEW) 1 2 3 4 5 6 7 8 9 10 11 12 24 23 22 21 20 19 18 17 16 15 14 13 OERB 1D 2D 3D 4D 5D 6D 7D 8D 9D CLR GND VCC 1Q 2Q 3Q 4Q 5Q 6Q 7Q 8Q 9Q OEQ LE 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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