LM556 Dual Timer : Circuit, Application and Datasheet

The LM556 dual sequential circuit is a highly stable controller that can generate precise time delays or oscillations. This 556 is double 555. Timing is provided by external resistor And the capacitor for each timing function. The two timers run independently of each other and only share VCC and ground. The circuit may be triggered and reset on falling Waveform. The output structure may sink or source 200mA.

Symbol

Footprint

3D Model

• Directly replace SE556/NE556

• Timekeeping from microseconds to hours

• Operate in astable and monostable mode

• Replace two 555 timers

• Adjustable duty cycle

• Output can provide or absorb 200mA

• Output and power supply TTL compatible

• Temperature stability is better than 0.005%/°C

• Normally open normally closed output

Texas Instruments LM556CN technical specifications, attributes, parameters and parts with similar specifications to Texas Instruments LM556CN.

The LM556 IC is the dual LM555 IC, meaning the LM556 has two timers inside it. Similar to the LM555 IC, LM556 can also be used for all those applications additionally, since this works with CMOS technology, we can have two timers inside a single package with improved characteristics.

So if you are looking for a modern replacement for the 555 Timer IC, then LM556 might be the right choice for you.

Application wise both 555 and 556 are the same. Since the LM556 is a 14-pin dual timer package there are two sets of all the timer pins (Threshold, Out, Trigger, Control Voltage, Discharge), and both the timer share the same Vcc and ground pins.

Timer IC’s are the most commonly used ICs for timing and Pulse generation applications. They can adapt themselves to various applications due to its different operating modes. They are very simple to understand and if we take a look at the components present inside as shown below

There are three resistors of value 5K, which gives this IC the iconic name “555 Timer”. It has dual comparators and flip-flop which will make this IC operated in three different modes such as Astable, Monostable, and Bistable(Schmitt) Mode. 

  •  Precise timing

  •  Pulse generation

  •  Sequential timing

  •  Delayed generation

  •  Pulse width modulation

  •  Pulse position modulation

  •  Linear ramp generator

Texas Instruments (TI) is an American technology company headquartered in Dallas, Texas, which designs and manufactures semiconductors and various integrated circuits, and sells them to electronic designers and manufacturers worldwide. It is one of the top 10 semiconductor companies in global sales. The company focuses on the development of analog chips and embedded processors, which account for more than 80% of its revenue. TI also produces TI digital light processing technology and educational technology products, including calculators, microcontrollers and multi-core processors. As of 2016, the company has 45,000 patents worldwide.

Download datasheets and manufacturer documentation for Texas Instruments LM556CN.