SN QUADRUPLE 2-INPUT POSITIVE-NAND BUFFERS WITH OPEN COLLECTOR OUTPUTS Datasheet. SN QUADRUPLE 2-INPUT. Datasheets. ˇˇ. CLICK HERE for the TTL and CMOS logic listings! CLICK HERE for links to other useful datasheet sites! This page contains links to datasheets for . Rev. 7 — 25 November Product data sheet. Table 1. Ordering information. Type number Package. Temperature range Name. Description. Version.

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By using our site, you acknowledge that you have read and understand our Cookie Policy 74xx, Privacy Policyand our Terms of Service. The concept is simple.

There are two 4 bit inputs going into the IC. I made the circuit and it does nothing.

List of 7400-series integrated circuits

If I change the input bits nothing happens. Here is a chart to sumarize the behavior of the circuit I built:. Here is the data sheet of the IC I’m not sure who datahseet the chip but it says N on it: Please clarify your specific problem or add additional details to highlight exactly what you need.

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7400 Quad 2-Input NAND Gate Datasheet

No, your input bits are never low. When the switch is OFF it connects nothingand the input is ‘floating’.

Floating is not LOW. Perhaps you thought datsaheet with nothing connected the input would naturally go down to 0V. I added a red line to show how voltage gets from Vcc to the input pin.

TTL NAND gate circuit not functioning – Electrical Engineering Stack Exchange

With nothing connected the input will float at about 1. There are two ways to pull an input LOW with a switch.

One way is to connect a pull down resistor from the input to ground. Since I IL can be up to 1. This method has the disadvantage that when the switch is 74xz it puts 5V across the resistor, which wastes current. There is still daatsheet wasted current, but much less than with a pull down resistor. Home Questions Tags Users Unanswered. Here is a chart to sumarize the behavior of the circuit I built: As you can see, no matter what the input the outputs is always Here is a diagram of the circuit: Draw a proper schematic a fritzing diagram of a breadboard is not a schematic and also upload a picture of your circuit.


If your breadboard is a double length one like shown, remember that typically there is a break in the power rail at the centre point, so it is possible that the GND and VCC are not connected to your NAND. But without an actual dwtasheet that is a guess. Also you are not connecting your inputs properly. You are connecting them to switches so dqtasheet the inputs are either connected to VCC or left floating.

A datashfet TTL device like the one you have has internal pull ups, which means when floating the pins will pull high – basically all your inputs are always high. Your switches should connect to GND. I’ll write all this up as an answer in a little while, just having dinner.

Just treat the switch being closed as a 0.

You don’t need any extra circuitry – the inversion can be built into your head with no electronics required.