64bit shift register with parallel load - Electronic Circuits Projects Diagrams Free

yugatharan · 14th May 2007, 05:33 AM

I want a shift register with 64/32 bits which have to be loaded parallely and shifted serially.please help me to find out the proper IC.

kchriste · 14th May 2007, 05:47 AM

Why not just cascade some 8bit ones like the 74HC164, 4094, etc. I doubt you'll find a 64bit one.

Sceadwian · 14th May 2007, 06:43 AM

kchriste's right, cascading multiple 8 bit devices is a simple sollution.

Mike, K8LH · 14th May 2007, 05:43 PM

Take any eight 8 bit shift registers and connect the DAT pin on each one to a unique pin, for example RB0 through RB7. Throw eight bytes onto this 8 pin bus with a CLK pulse after each byte. The 1st byte should contain all of the bit 7 values, one bit for each shift register. The 2nd byte should contain all of the bit 6 values, one bit for each shift register. And so on through the 8th byte which contains all of the bit 0 values, one bit for each shift register.

I use a scheme similar to this to load up 64 bits for a matrix display "scan" cycle in about 4.8-usecs.

Mike, K8LH · 14th May 2007, 06:04 PM

On re-reading your post I'm not sure my suggestion is what you're looking for. If that's the case, I apologize Sir.

Mike

justDIY · 14th May 2007, 06:55 PM

so you want a parallel load (input), serial shift (output) register, that is 64 bits wide?

a few ideas come to my mind:

1) use eight 74HC165 parallel-load serial shift registers and 4017 counter to step through the register one byte at a time (toggle the shift/load pin)

2) use four 16bit i2c IO expanders

3) use two inexpensive micrcontrollers (like the 16f74 or 16f877a) as 32bit parallel load serial shift registers like the 165, but program them to support cascading

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14th May 2007, 05:33 AM	(permalink)
yugatharan	64bit shift register with parallel load I want a shift register with 64/32 bits which have to be loaded parallely and shifted serially.please help me to find out the proper IC.

14th May 2007, 05:47 AM	(permalink)
kchriste	Why not just cascade some 8bit ones like the 74HC164, 4094, etc. I doubt you'll find a 64bit one. __________________ --- The days of the digital watch are numbered. ---

14th May 2007, 06:43 AM	(permalink)
Sceadwian	kchriste's right, cascading multiple 8 bit devices is a simple sollution. __________________ "Because I be what I be. I would tell you what you want to know if I could, mum, but I be a cat, and no cat anywhere ever gave anyone a straight answer, har har."

14th May 2007, 06:04 PM	(permalink)
Mike, K8LH	On re-reading your post I'm not sure my suggestion is what you're looking for. If that's the case, I apologize Sir. Mike

14th May 2007, 06:55 PM	(permalink)
justDIY	so you want a parallel load (input), serial shift (output) register, that is 64 bits wide? a few ideas come to my mind: 1) use eight 74HC165 parallel-load serial shift registers and 4017 counter to step through the register one byte at a time (toggle the shift/load pin) 2) use four 16bit i2c IO expanders 3) use two inexpensive micrcontrollers (like the 16f74 or 16f877a) as 32bit parallel load serial shift registers like the 165, but program them to support cascading __________________ If you don't have a planet, what good are gold bars? want to contact me directly? gmail gordonthree check out my project website: http://projects.dimension-x.net Favorite numbers: 09 F9 11 02 9D 74 E3 5B D8 41 56 C5 63 56 88 C0