I'm doing a IC tester and it is able to only input high and low voltages to the Input pin of the IC. What input should i set for the CLK input pin of 74 series IC such as 74LS73A (flip-flop)? The datasheet for the 74LS73A (flip-flop) is accessible from
That datasheet is for a 74LS95B. Change the part number at the end to
74LS73 to get the 74LS73 datasheet.The '73 is a negative edge triggered device. Initially set the clock high, then change it to low, and the output should switch to match the D input. Change the D input, then set the clock up and down again to see the output change again.
The 74LS73 data sheet has a very nice truth table that illustrates how the part works.
-- Peter Bennett, VE7CEI peterbb4 (at) interchange.ubc.ca new newsgroup users info : http://vancouver-webpages.com/nnq GPS and NMEA info: http://vancouver-webpages.com/peter Vancouver Power Squadron: http://vancouver.powersquadron.ca
must be careful with the part number.. if it has an "A" or the LS73A for example,. it's a Negative Edge trigger and the Q's will reflect the JK inputs on the falling edge of the clk otherwise, if i'm reading the DOC's correct for the NON "A" version. The Q's will reflect the JK input while the CLK is held high. The Q's will toggle if both JK are on at the same time, and putting them to both OFF and on again will toggle the Q's. When the clk finally drops, it will then latch onto the last value.
at least that is the why i understand it, it's been a while since i played with logic from a chip, i do it mostly in uC these days.
-- "I\'m never wrong, once i thought i was, but was mistaken" Real Programmers Do things like this. http://webpages.charter.net/jamie_5
ElectronDepot website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.