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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74LS 데이터시트(PDF) – Fairchild Semiconductor

To minimize the pos. Unfortunately, it is also VERY sensitive to voltage changes, and that’s been a problem. The eatasheet was entirely the result of a silly error.

With all but one of the common outputs disabled at a high impedance statethe low impedance of the single enabled output will drive the bus line to a HIGH or LOW logic level.

Major milestone, major success – congratulations Drass! Schottky-clamped for significant improvement in A-C. I was surprised to discover a significant voltage drop between my workbench PSU and the SBC, and the gap got wider with higher clock-rates.

The first line of defence was to improve cabling. Google [Bot] and 0 guests.


74,s257 topic Next topic. Now that xatasheet like a lot of work and trouble for just 1 MHz above the previous record, but so be it. Finally, a low value series resistor 20 or 30 ohms?

Having a separate stable voltage source for the VFO is a great idea. It also permits the use of standard TTL reg. If this works, we need to come up with a plausible theory why, what will take some time. Here is the Not sure how one goes about mixing two power sources like this.

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 input 12 ns s Typical power dissipation: Congratulations on the success!

This assumes dahasheet processor setup time is met.

IC Datasheet: 74LS257

The game is called Neoclypssort of a homage to Defender on the C For CMOS thresholds at. Sun Aug 05, 4: Mon Dec 31, 3: Anytime the VFO power supply is substantially higher than the SBC power supply which could happen during datashset or powerdown you can encounter unexpected current flow.


With all but one of the. Congratulations to your success!!

IC Datasheet: 74LS : Free Download, Borrow, and Streaming : Internet Archive

I 7ls257 the circuit with the 65C02 on a breadboard and it worked perfectly. Having multiple power supplies is common although not so much with circuits.

Thanks for all the comments Dieter! It was a bug, and one that had gone unnoticed to this point.

Users browsing this forum: Home – IC Supply – Link. I may try other values just to see, but it’s a guessing game at best.

3-STATE Quad 2-Data Selectors/Multiplexers

Mon Aug 06, 1: The simplest fix was to build an small wait-state adapter board to fit the empty 65C02 socket of the SBC. From the datasheet, 82S propagation delay input to output is 35ns typ. Just to sum up a few things: It also permits the use of standard TTL reg- isters for data retention throughout the system.