7400 Series Guide: 74LS54 (4-wide 2/3-input AND-NOR gates)

The 74×54 (ex 74LS54) is a chip with a combination of logic in a 4-wide 2/3-input AND-NOR gate combination.

In this guide, you will learn everything you need to know about this chip and how you can use this type of logic gate combination chip in your own projects.

What does the 74×54 do?

The 74LS54 gives you a 4-wide 2/3-input AND-NOR gate combination. 4-wide means that it has four AND gates that serve as inputs to the NOR gate. Two 2-input AND gates and two 3-input AND gates.

An AND gate will output 1 (HIGH) if all of its inputs are 1 (HIGH). A NOR gate outputs 1 (HIGH) if all of its inputs are 0 (LOW). Therefore, to get a low output from this chip, all of the inputs to one of the AND gates must be high.

How To Use This Chip

The 74LS54 comes in a 14-pin package that you need to connect to power before you can use it. This chip supports a VCC voltage of 5V.

The maximum current you can pull out of the output Y (pin 6) is 0.4 mA when the pin is high (sourcing) or 8 mA when the pin is low (sinking). This can differ between models, so check the datasheet of your model to verify.

Once you’ve connected it to power, the 4-wide 2/3-input AND-NOR gate combination is functional.

74LS54 Pinout

The 74LS54 has 14 pins and contains a 4-wide 2/3-input AND-NOR gate combination laid out as shown in the pinout diagram below:

Pin #	Type	Description
1	Input	Input to the first 2-input AND gate.
2	Input	Input to the first 2-input AND gate.
3	Input	Input to the first 3-input AND gate.
4	Input	Input to the first 3-input AND gate.
5	Input	Input to the first 3-input AND gate.
6	Output	Output from the NOR gate.
7	Power	Connect to ground (GND).
8	–	Not connected
9	Input	Input to the second 3-input AND gate.
10	Input	Input to the second 3-input AND gate.
11	Input	Input to the second 3-input AND gate.
12	Input	Input to the second 2-input AND gate.
13	Input	Input to the second 2-input AND gate.
14	Power	Positive power supply (VCC). Connect to +5V power.

Alternatives and Equivalents

There are a few versions of the 74×54 chip. They all have the same functionality, but with different specifications such as supported voltages and maximum current output.

Here’s a list of a few equivalents of this chip, although not all of these actually exist:

• 74HC54 (High-speed CMOS)
• 74HCT54 (High-speed CMOS, TTL compatible)
• 74LS54 (High-speed TTL)
• 74LVC54 (Low Voltage TTL)
• 74AC54 (Advanced CMOS)
• 74ALS54 (Advanced Low-Power Schottky TTL)
• 74F54 (Very High Speed)
• 74C54 (CMOS, similar to the 4000-series)

Some manufacturers also add a prefix, such as the SN74LS54 by Texas Instruments.

Can’t find the 74×54 anywhere? Then try one of the following IC alternatives:

• 74×50 – Dual 2-input AND-OR-Invert gate
• 74×51 – 2-Wide 2/3-input AND-NOR gate
• 74×55 – 2-wide 4-input AND-NOR gate
• CD4085 – Dual 2-input AND-OR-Invert gate

If you can’t find the 74×54 IC in your local electronics store, don’t worry, you’ll most likely find it in one of the stores listed on this page of online stores where you’ll find components and tools for all your electronics projects.

Datasheet for the 74LS54 chip

Download the PDF datasheet for your version of the 74×54 here:

• 74LS54 (Futurlec)
• SN74LS54 (Texas Instruments)