74LS datasheet, 74LS pdf, 74LS data sheet, datasheet, data sheet, pdf, Fairchild Semiconductor, 3-STATE Quad 2-Data Selectors/Multiplexers. These Schottky-clamped high-performance multiplexers feature 3-STATE outputs that can interface directly with data lines of bus-organized systems. With all but. 74LS datasheet, 74LS circuit, 74LS data sheet: FAIRCHILD – 3- STATE Quad 2-Data Selectors/Multiplexers,alldatasheet, datasheet, Datasheet.

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This 3-STATE output feature means that n-bit paralleled data selectors with up to sources can be implemented for data buses.

I may try other values just to see, but it’s a guessing game at best. Sun Aug 05, 3: I used the wait-state circuit we discussed earlier in this thread to insert one or two wait-states when A15 goes high, as follows: Now here is one of the original objectives of the project as outlined back in Congratulations datasgeet your success!! Sun Aug 05, 2: The VFO will allow a very gradual increase of the clock-rate, which is very handy.

For CMOS thresholds at.

This results in a potential threat which you may choose to address. Anytime the VFO power supply is substantially higher than the SBC power supply which could happen during powerup or powerdown you can encounter unexpected current flow. Page 29 of Previous topic Next topic. Not sure how one goes about mixing two power sources like this.


The game is called Neoclypssort of a homage to Defender on the C To minimize the pos. If the VFO output is strong enough it’ll exceed the 74ld257 tiny current-carrying capability of the input-protection diode and destroy it. Select a forum You cannot post new topics in this forum You cannot reply to topics in this forum You cannot edit 74sl257 posts in this forum You cannot delete your posts in this forum You cannot post attachments in this forum.

This is most visible during the second write pulse. Thanks for all the comments Dieter!

org • View topic – TTL Here I come

Look at what that little CPU did! Mon Aug 06, 8: But first, there is still that C The VFO kind of falls into the category 74ls2257 test equipment to be connected temporarily; so from that perspective, you could connect it only after both the VFO and the SBC are powered up, then press the SBC’s reset button.

Features s 3-STATE versions LS and LS with same pinouts s Schottky-clamped for significant improvement in A-C performance s Provides bus interface from multiple sources in high-performance systems s Average propagation delay from data datashedt 12 ns s Typical power dissipation: Unfortunately, it is also VERY sensitive to voltage changes, and that’s been a problem.

Mon Aug 06, 1: That helped narrow the voltage gap, so I felt the CPU was more easily dztasheet draw the additional power it requires at high clock-rates.


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If this fails, we need to come up with a plausible theory why, what will take some time. Home – IC Supply – Link. Got the timing parameters for 74xx chips from there: Having a separate stable voltage source for the VFO is a great idea. Schottky-clamped for significant improvement in A-C.

3-STATE Quad 2-Data Selectors/Multiplexers

Mon Feb 19, The C64 booted without a problem. These Schottky-clamped high-performance multiplexers. The VFO will be used seldom enough that it should be practical to give it its own 9V battery and a 78L05 regulator or even an datzsheet LML both being in a small TO packageso it won’t be affected by the computer’s power-supply voltage.

Average propagation delay from data input 12 ns.

Mon Dec 31, 3: Google [Bot] and 0 guests. With all but one of the common outputs disabled at datashet high impedance statethe low impedance of the single enabled output will drive the bus line to a HIGH or LOW logic level. Here is the Users browsing this forum: It turns out RDY took effect one cycle too late! TTL Here I come. A very gratifying result, especially given the cycle-accurate constraint.