54ACT574 Datasheet | National Semiconductor

Description The ’AC/’ACT574 is a high-speed, low power octal flip-flop with a buffered mon Clock (CP) and a buffered mon Output Enable (OE). The information presented to the D inputs is stored in the flip-flops on the LOW-to-HIGH Clock (CP) transition. The ’AC/’ACT574 is functionally identical to the ’AC/’ACT374 except for the pinouts. Features n ICC and IOZ reduced by 50% n Inputs and outputs on opposite sides of package allowing easy interface with microprocessors n Useful as input or output port for microprocessors n Functionally identical to ’AC/’ACT374 n TRI-STATE outputs for bus-oriented applications n Outputs source/sink 24 m A n ’ACT574 has TTL-patible inputs n Standard Microcircuit Drawing (SMD) - ’ACT574: 5962-89601 Logic Symbols IEEE/IEC DS100256-1 DS100256-4 Pin Names D0- D7 CP OE O0- O7 Data Inputs Description Clock Pulse Input TRI-STATE Output Enable Input TRI-STATE Outputs TRI-STATE ® is a registered trademark of National Semiconductor Corporation. FACT™ is a trademark of Fairchild Semiconductor Corporation. © 1998 National Semiconductor Corporation DS100256 .national. Connection Diagrams Pin Assignment for DIP, and Flatpak Pin Assignment for LCC DS100256-2 DS100256-3 Functional Description The ’AC/’ACT574 consists of eight edge-triggered flip-flops with individual D-type inputs and TRI-STATE true outputs. The buffered clock and buffered Output Enable are mon to all flip-flops. The eight flip-flops will store the state of their individual D inputs that meet the setup and hold time requirements on the LOW-to-HIGH Clock (CP) transition. With the Output Enable (OE) LOW, the contents of the eight flip-flops are available at the outputs. When OE is HIGH, the outputs go to the high impedance state. Operation of the OE input does not affect the state of the flip-flops. Function Table Inputs OE H H H H L L L L CP H H N N N N H H D L H L H L H L H Internal Outputs Q NC NC L H L H NC NC ON Z Z Z Z L H NC NC Hold Hold Load Load Data Available Data...