Latch wont latch
Hi,
I am desigining a 64-ary QAM. While desiging,i encountered an unexpected problem in the latch.The problem is the latch wont latch.Since this is for study purpose,i am using low frequencies only.I am giving a clock frequency of 6.4KHz and the data rate is 19.2Kbps. Logic 1 is +5 Volt and Logic 0 is 0 Volt. When used under these condition,the latch is not working.I am using DM74LS374 latch.Can anybody please help me out?
Saju.
Please post a schematic.
I do not answer private messages asking for help because no one else can: benefit from advice I may give or correct me if I'm wrong.
Please ask on the open forum if you have a question and I'll be happy to help, if I know the answer.
That's funny. Every LS374 I've ever used was transparent when the latch enable signal was high and latched when latch enable was low. That is the only possible misinterpretation I can think of.
Another issue might lie in the fact that the 'LS374 is an octal d-type flip-flop, not an octal latch. The 'LS373 is an octal transparent latch. Both have tri-state outputs. Personally, I like the '573 and '574 for ease of PC board layout.
JB
Jeff
Nothing is impossible for the man who doesn't have to do it himself - Weiler's Law
Qam Ic
Finally, it worked. There was a problem with the clock. I want to know whether is there any IC's available particularly for QAM. If u know,please help me out.
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