SN74AS534 Datasheet | Texas Instruments

description These octal D-type edge-triggered flip-flops feature 3-state outputs designed specifically for driving highly capacitive or relatively lowimpedance loads. They are particularly suitable for implementing buffer registers, I/O ports, bidirectional bus drivers, and working registers. On the positive transition of the clock (CLK) input, the Q outputs are set to the plement of the logic states set up at the data (D) inputs. The ’ALS534A and SN74AS534 have inverted outputs, but otherwise are functionally equivalent to the ’ALS374A and SN74AS374. A buffered output-enable (OE) input places the eight 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. 4Q SN54ALS534A . . . J PACKAGE SN74ALS534A, SN74AS534 . . . DW OR N PACKAGE (TOP VIEW) OE 1 1Q 2 1D 3 2D 4 2Q 5 3Q 6 3D 7 4D 8 4Q 9 GND 10 20 VCC 19 8Q 18 8D 17 7D 16 7Q 15 6Q 14 6D 13 5D 12 5Q 11 CLK SN54ALS534A . . . FK PACKAGE (TOP VIEW) 8Q 1Q 1D 2D 3 2 1 20 19 8D 2Q 5 17 7D 3Q 6 16 7Q 3D 7 15 6Q 4D 8 14 6D 9 10 11 12 13 5Q 5D OE does not affect the internal operations of the flip-flops. Old data can be retained or new data can be entered while the outputs are off. The SN54ALS534A is characterized for operation over the full military temperature range of - 55°C to 125°C. The SN74ALS534A and SN74AS534 are characterized for operation from 0°C to 70°C. FUNCTION TABLE (each flip-flop) INPUTS OE CLK D OUTPUT...