AN214

INTEGRATED CIRCUITS AN214 74F extended octal-plus family applications June 1988 (Revised June 1996) Philips Semiconductors Philips Semiconductors Application note 74F extended octal-plus family applications AN214 74F Extended Octal-Plus Family Features 8-, 9-, and 10-bit “Light-Load” bus products – Buffers/Drivers With and without latches or registers With and without 8-bit parity checker/generator – Transceivers With and without dual registers With and without 8-bit parity checker/generator “light-load” inputs, “broadside” design and high functional density/performance of the family make this product line ideal for buffering the limited drive capabilities of standard, custom and semicustom MOS VLSI devices to the rigorous environments of today’s leading edge high performance logic designs. The family also is an excellent choice for all general interface applications. “Flow-Through” Design The “flow-through” or “broadside” chip layout/package design is illustrated in Figure 1 showing the block diagrams and pin configurations of the 74F828 10-bit Inverting buffer. Note that all of these “broadside” designs allow logic signals to flow into one side and out of the other without crossing or folding back on signal paths such as the 74F240 Octal Buffers (Figure 2). If you compare the physical layout requirements of the path of PC board bus lines for the 74F828 to that of the 74F240’s “zig-zag” path, you will see the significant advantages of the 74F Extended Octal-Plus...