SN74ALS992 Datasheet | Texas Instruments

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. DW OR NT PACKAGE (TOP VIEW) OERB 1 1D 2 2D 3 3D 4 4D 5 5D 6 6D 7 7D 8 8D 9 9D 10 CLR 11 GND 12 24 VCC 23 1Q 22 2Q 21 3Q 20 4Q 19 5Q 18 6Q 17 7Q 16 8Q 15 9Q 14 OEQ 13 LE 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† 14 OEQ 1 OERB 11 CLR 13 LE 2 1D 3 2D 4 3D 5 4D 6 5D 7 6D 8 7D 9 8D 10 9D EN3 EN2 R C1 1D † This symbol is in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12. 23 1Q 22 2Q 21 3Q 20 4Q 19 5Q 18 6Q 17 7Q 16 8Q 15 9Q 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. - POST OFFICE BOX 655303 DALLAS, TEXAS 75265 Copyright © 1995, Texas Instruments Incorporated 1 SN74ALS992 9-BIT D-TYPE TRANSPARENT READ-BACK LATCH WITH 3-STATE...