Ok, so I have one more question

andipi · Oct 12, 2003

Building a one-minute timer, I have got to the stage where i have a 6 bit output (seconds - ie it counts to 59 and then resets) what I now need to do is decode the 6 bit signal either into two four bit signals, which could then be decoded for two 7 segmant LEDs, or find an IC which could directly decode the signal for the 2 7-segmants.

Either way, does anyone know how this could be done?

Any help would be greatly appreciated!

Andy

nettron1000 · Oct 12, 2003

Have you considered using a dual decade counter IC such as a 74LS390 ?
These output a dual 4 bit code which can be used as the input to two 7447's or 7448's 7-segment dispay driver IC's.

Heres the data sheet for the 74390IC:

https://www.fairchildsemi.com/ds/DM/DM74LS390.pdf

Roff · Oct 12, 2003

The CD4511 is a dual decade (BCD) counter, so there is no point in changing to a 390. You can use CD4511s, which are BCD to 7 segment latch/decoder/drivers.

andipi said:
Building a one-minute timer, I have got to the stage where i have a 6 bit output ...
Andy

It only takes 6 bits to represent 0-59 in binary, but you need 7 bits in BCD. Not a problem here - just a technical point.

andipi · Oct 12, 2003

Ah thanks - i think i must have been confused as to what a BCD was. Am I right to assume that a BCD encodes each number (so 31 would be 0011 0001).

Andy

Roff · Oct 13, 2003

andipi said:
Ah thanks - i think i must have been confused as to what a BCD was. Am I right to assume that a BCD encodes each number (so 31 would be 0011 0001).

Andy

You got it.

andipi · Oct 13, 2003

Thanks!

Andy

nettron1000 · Oct 13, 2003

The CD4511 is a dual decade (BCD) counter, so there is no point in changing to a 390. You can use CD4511s, which are BCD to 7 segment latch/decoder/drivers.

4511 ? I thought he was using a 4518 ? I know you can get dual latch/decoder/7 segment driver IC's but wasnt he inquiring about decoding a 6 bit output ?

Roff · Oct 13, 2003

nettron1000 said:
The CD4511 is a dual decade (BCD) counter, so there is no point in changing to a 390. You can use CD4511s, which are BCD to 7 segment latch/decoder/drivers.

Click to expand...

4511 ? I thought he was using a 4518 ? I know you can get dual latch/decoder/7 segment driver IC's but wasnt he inquiring about decoding a 6 bit output ?

Oops! I intended to say that he could use the 4518 dual decade counter, and the 4511s for the decoder/drivers.

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