DM74ALS573B

DM74ALS573B Extended Temperature Octal D-Type Transparent Latch with 3-STATE Outputs April 1984 Revised February 2000 DM74ALS573B Extended Temperature Octal D-Type Transparent Latch with 3-STATE Outputs General Description These 8-bit registers feature totem-pole 3-STATE outputs designed specifically for driving highly-capacitive or relatively low-impedance loads. The high-impedance state and increased high-logic-level drive provide these registers with the capability of being connected directly to and driving the bus lines in a bus-organized system without need for interface or pull-up components. They are particularly attractive for implementing buffer registers, I/O ports, bidirectional bus drivers, and working registers. The eight latches of the DM74ALS573B are transparent Dtype latches. While the enable (G) is HIGH the Q outputs will follow the data (D) inputs. When the enable is taken LOW the output will be latched at the level of the data that was set UP. A buffered output control input can be used to place 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 output control does not affect the internal operation of the latches. That is, the old data can be retained or new data can be entered even while the outputs are OFF. Features s Switching specifications at 50 pF s Switching specifications guaranteed over full temperat...