fbpx

7400 Series Guide: 74HC113/74LS113 (Dual J-K flip-flop)

The 74×113 (ex 74HC113) is a chip that contains two negative-edge-triggered J-K flip-flops.

In this guide, you’ll learn the things you need to know about this chip in order to use J-K flip-flops effectively in your own projects.

74HC113 / 74LS113 Package And Pinout

What does the 74HC113 / 74LS113 do?

The 74×113 is a dual J-K flip-flop with preset. This means it has two identical J-K flip-flops inside one chip.

A J-K flip-flop is a digital circuit that can store one bit of data. It changes its output state based on the inputs provided to it.

  • When both the J and K inputs are LOW, the flip-flop holds its current state.
  • When J is HIGH and K is LOW, it sets the flip-flop output to HIGH.
  • When J is LOW and K is HIGH, it resets the output to LOW.
  • When both J and K are HIGH, it toggles the output, meaning it switches the current state to the opposite.

The flip-flops also have a preset feature, which can be used to force the output to HIGH, regardless of the J and K inputs. This type of flip-flop is useful in applications that require data storage, counters, and toggle operations.

How To Use This Chip

The 74HC113 comes in a 14-pin package, and you need to connect it to power before you can use it. Most 7400 ICs support a VCC voltage of 5V. One difference between the HC and LS version of the chip is that the 74HC113 supports 2V to 6V, while the 74LS113 only supports 5V.

74HC chips can normally supply a maximum of 4 mA from an output pin. If you’re using the 74LS version, the maximum current you can pull out of one output pin is 0.4 mA when the pin is high (sourcing) or 8 mA when the pin is low (sinking).

But these values can differ between models, so check the datasheet of your model to verify.

Once you’ve connected it to power, you can use the JK flip-flops inside.

7400 series IC connected to 5V on a breadboard
The 74HC113/74LS113 IC connected to power

74×113 Pinout

The 74×113 has 14 pins and contains two negative-edge-triggered J-K flip-flop with set laid out as shown in the pinout diagram below:

74HC113 Pinout
Pin NamePin #TypeDescription
1CLK1InputClock input to the first JK flip-flop (active low).
1K2InputK input to the first JK flip-flop.
1J3InputJ input to the first JK flip-flop.
1SET4InputSet input for the first JK flip-flop (active low).
1Q5OutputOutput from the first JK flip-flop.
1Q6OutputInverted output from the first JK flip-flop.
GND7PowerConnect to ground (GND).
2Q8OutputInverted output from the second JK flip-flop.
2Q9OutputOutput from the second JK flip-flop.
2SET10InputSet input for the second JK flip-flop (active low).
2J11InputJ input to the second JK flip-flop.
2K12InputK input to the second JK flip-flop.
2CLK13InputClock input to the second JK flip-flop (active low).
VCC14PowerPositive power supply. Connect to +5V power.
Pin overview for the 74×113 IC

Alternatives and Equivalents for 74HC113 / 74LS113

There are many versions of the 74×113 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:

  • 74HC113 (High-speed CMOS)
  • 74HCT113 (High-speed CMOS, TTL compatible)
  • 74LS113 (High-speed TTL)
  • 74LVC113 (Low Voltage TTL)
  • 74AC113 (Advanced CMOS)
  • 74ALS113 (Advanced Low-Power Schottky TTL)
  • 74F113 (Very High Speed)
  • 74C113 (CMOS, similar to the 4000-series)

Some manufacturers also add a prefix, such as the SN74HC113 and SN74LS113 by Texas Instruments.

Can’t find the 74×113 anywhere? Then try one of the following IC alternatives:

  • 74×67 – AND-gated master-slave J-K flip-flop.
  • 74×70 – AND-gated positive-edge triggered J-K flip-flop.
  • 74×72 – AND-gated master-slave J-K flip-flop.
  • 74×73 – Dual positive-edge triggered J-K flip-flop.
  • 74×76 – Dual J-K flip-flop.
  • 74×78 – Dual negative-edge triggered J-K flip-flop.
  • 74×107 – Dual negative-edge triggered J-K flip-flop.
  • 74×109 – Dual J-K flip-flop.
  • 74×112 – Dual negative-edge-triggered J-K flip-flop.
  • 74×114 – Dual J-K flip-flop.
  • CD4027 – Dual J-K master-slave flip-flop.
  • CD4095 – Gated J-K flip-flop.
  • CD4096 – Gated J-K flip-flop.

If you can’t find the 74×113 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 74LS113 and 74HC113 chips

Download the PDF datasheet for your version of the 74×113 here:

Leave a Comment