| ??? 06/19/06 03:19 Read: times |
#118508 - Depends on your actual needs Responding to: ???'s previous message |
Munaza said:
but couldnt find enough data for 74hc598 Try 74HC597. Munaza said:
but is 8255 really a bad idea??. This depends on your actual application, which I don't know much about. If you use 82C55, then you must route an 8bit data bus over the PCB, additional read and write lines and some select lines to distinguish between the individual 82C55. With the shift registers, on the other hand, you have only to transmit a data, a clock and a strobe line. Also, the 74HCMOS chips are much more robust than those 82C55 and can directly drive LEDs. Special derivatives of these shift registers are available which allow you to directly drive even much heavier loads, like lamps, etc. These 74HCMOS chips are very tiny, if you use SMD-versions, and you can easily find an optimum layout, not wasting any PCB area. Kai |
