SN74ALS843 Datasheet | Texas Instruments

description SN74ALS843 9-BIT BUS-INTERFACE D-TYPE LATCH WITH 3-STATE OUTPUTS SDAS232A - DECEMBER 1983 - REVISED JANUARY 1995 DW OR NT PACKAGE (TOP VIEW) OE 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 PRE 13 LE This 9-bit bus-interface D-type latch features 3-state outputs designed specifically for driving highly capacitive or relatively low-impedance loads. It is particularly suitable for implementing buffer registers, I/O ports, bidirectional bus drivers, and working registers. The nine latches are transparent D-type latches with noninverting data (D) inputs. A buffered output-enable (OE) input places the nine outputs in either a normal logic state (high or low logic levels) or a high-impedance state. In the high-impedance state, the outputs neither load nor drive the bus lines significantly. The high-impedance state and increased drive provide the capability to drive bus lines without interface or pullup ponents. OE does not affect the internal operation of the latches. Previously stored data can be retained or new data can be entered while the outputs are off. The SN74ALS843 is characterized for operation from 0°C to 70°C. PRE L H H H H X FUNCTION TABLE INPUTS CLR OE...