SN54/74LS HEX INVERTER. LOW POWER SCHOTTKY. J SUFFIX. CERAMIC . CASE N SUFFIX. PLASTIC. CASE 1. 1. ORDERING. data sheet for high speed method of comparing large words. The Truth Table on the following page describes the operation of the. SN54 / 74LS85 under all. Description, Hex Inverters(with Open Collector Outputs). Company, Hitachi Semiconductor (acquired by Renesas). Datasheet, Download 74LS05 datasheet.
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74LS05 / INVERTER DIP14 – Retroamplis
It looks like the 74LS05 has “open collector outputs” not sure what that is and the 04 does not. There are two general types of outputs in digital circuitry: Push-pull outputs, which are in the 74LS04 drive the output high to the level of the power input of the chip, 74ls50 5v or 3. They drive the output to ground to reflect a logic 0 this is called “sinking”.
What good is that?
Well it allows the output of several chips to be datashedt together, and they won’t be interfering with each other all trying to drive the line high. One example is several devices with interrupt outputs feeding into a single interrupt pin on a microcontroller. When there is no interrupt, the line is high.
74LS05 / 7405 INVERTER DIP14
How, if no output is driving it high? Somewhere there will be a “pull-up resistor” common values are 4.
Then when an interrupt occurs, the chip causing the interrupt will pull the line to ground. Since the pull-up resistor is a fairly high value, this will not draw very much current, about 1 mA for a 4. The line into the microcontroller going to a logic 0 will be recognized as an interrupt — since this is caused by the line ddatasheet from high to low, this is called an “active low” signal.
Regular push-pull outputs are used when only eatasheet output is driving one or more inputs, which is the case most of the time.
But this way you don’t need to actually include the physical gate.
74LS05 Datasheet(PDF) – Fairchild Semiconductor
Home Questions Tags Users Unanswered. What’s the difference between a 74LS05 hex inverter and a 74LS04 hex inverter? Plus, it appears the 05 is more expensive? Can someone tell me the difference between the two and when would you use one vs.
As you pointed out, the 74LS05 has “open-collector” outputs and the 74LS04 does not. Excellent explanation for how OC works.
One other way to look at it: KevinKeane Good point – I’ll add that to my answer. Datasheett I recall correctly, at least some open collector outputs can accept higher voltages than 5. You can use them to turn a 12V light on and off by connecting the light between 12V and the output.
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