Shift registers for propeller

tuxman

I am looking for a fast (>1Mhz range, faster=better) shift registers for both input and output
And good suggestions?

jmg

tuxman wrote: »

I am looking for a fast (>1Mhz range, faster=better) shift registers for both input and output
And good suggestions?

Do you expect one part code to do both ?

The high-volume parts for Shifting-Out are the HC595 variants, which include TPIC6C595, TPIC6D595 etc power variants.

Shifting-In, is parts like HC597

There is also HC299, which can do Tri-state Octal Out or In, but not in any mix, and one way at a time.

Some LED driver variants can read-back, so they can do a mix of Out and In, but strangely there is no generic logic part that is designed for any mix of I/O.

With MCUs dropping in price, if you want a flexible mix of IO, in one package, then you are probably best to just use a small Micro.

Duane Degn

I'm pretty sure the TPIC6B595 shift registers I'm using with my RGB LED arrays will process the bits as fast as the Propeller can send them using PASM.

I use three of the TPIC6B595 one each 8x8 array and I can get 5-bit color (on two arrays using one cog) without a noticeable flicker.

For input, I like the '165 chip since it's practically the same as the '595 chips except it's an input instead of an output. So far I've only used '165 chips with a Spin driver. I don't know if these chips have a speed limit when clocking in data

I should mention I haven't used many different kinds of shift registers so one of the chips jmg could be a better option.

kwinn

Most of the 74xx (HC, HCT, ALS) series cmos chips can be clocked at 10MHz or more at Vcc = 5V, and some at 3.3V