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Help with SN74LS191

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dolly

New Member
SN74LS191 (TI) - SYNCHRONOUS UP/DOWN COUNTERS WITH DOWN/UP MODE CONTROL, Counters

Please see the datasheet above of SN74LS191 and help me using this.
I'm making Digital switching system as a project where different IC (74ls93) was used and now not available in market.Now im using LS191 and finding difficulty in its input.
I need ur help...
I'm a student and new to this work.:(
Below is my project description
Electronics for You-Circuit Lab- Free and tested circuit diagrams-Digital Switching System
 

crutschow

Well-Known Member
Most Helpful Member
You can also use a 74HC93 as a direct replacement. It works better and is easier to find. 74LS is old. 74HC is new.
Be aware that, although the 74HC93 is functionally equivalent to the 74LS93, 74HC devices are CMOS and have somewhat different operating and I/O characteristics than the 74LS devices, which are bipolar.
 

nike6

Banned
I consider it remarkable that such a circuit is still being built from conventional digital logic.

As far as i understand, such design is now understood as inflexible,
because it is hardwired.

Maybe it is a good exercise for students.

my question is, if the OP has designed the circuit freshly, or if it was found in a book etc.?

also it is unknown if it is the OP's own website.

when i look the schematic, there is some device which has a BCD or 4bit hex output.
I'd suggest to install a mechanical hex/BCD encoder, and test the circuit.

anyway it's a limited design, as far as i understand only one load can be selected at one point of time.
 
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