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SN74ALS666 Datasheet(PDF) 1 Page - Texas Instruments |
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SN74ALS666 Datasheet(HTML) 1 Page - Texas Instruments |
1 / 8 page SN74ALS666, SN74ALS667 8-BIT D-TYPE TRANSPARENT READ-BACK LATCHES WITH 3-STATE OUTPUTS SDAS227A – JUNE 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 • Choice of True or Inverting Logic – SN74ALS666...True Outputs – SN74ALS667... Inverted Outputs • Preset and Clear Inputs • Package Options Include Plastic Small-Outline (DW) Packages and Standard Plastic (NT) 300-mil DIPs description These 8-bit D-type transparent latches are designed specifically for storing the contents of the input data bus, plus reading back the stored data onto the input data bus. In addition, they provide a 3-state buffer-type output and are easily utilized in bus-structured applications. While the latch enable (LE) is high, the Q outputs of the SN74ALS666 follow the data (D) inputs. The Q outputs of the SN74ALS667 provide the inverse of the data applied to its D inputs. The Q or Q output of both devices is in the high-impedance state if either output-enable (OE1 or OE2) input is at a high logic level. Read back is provided through the read-back control (OERB) input. When OERB is taken low, the data present at the output of the data latches passes 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, caution should be exercised to avoid a bus conflict. The SN74ALS666 and SN74ALS667 are characterized for operation from 0 °C to 70°C. SN74ALS666 ...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 OE1 1D 2D 3D 4D 5D 6D 7D 8D CLR GND VCC OE2 1Q 2Q 3Q 4Q 5Q 6Q 7Q 8Q PRE LE SN74ALS667 . . . 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 OE1 1D 2D 3D 4D 5D 6D 7D 8D CLR GND VCC OE2 1Q 2Q 3Q 4Q 5Q 6Q 7Q 8Q PRE 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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