Difference between LVDS and TTL

The distinction between LVDS and TTL would be that LVDS relates to information transmission mode, whereas TTL refers to suitable transmission. In LVDS, two wires with various voltages are used, while TTL uses a ground system reference to identify the presence or absence of voltage in digital digits of 0 or 1.

LVDS requires around 350mV of power. Because LVDS has excellent resistance to distortion, gadgets can use length wires. Twisted pair copper wires are employed in LVDS to produce strong electromagnet coupling. They have the capacity to stabilize voltage spikes. In contrast to TTL, the third point of reference of LVDS is not the bottom.

TTL, on the other hand, uses a 5 V supply from the transistor and draws more power. TTL lacks inherent resistance and so cannot regulate voltage spikes, which can lead to binary output errors. Because the mode of transmission is parallel, distinct lines are required, increasing the number of wires.

Differential signaling is a way of electrically conveying information using two complementary signals. This technology may send equivalent electrical signals in the form of differential pairs through its conductors. Differential signaling is commonly employed in two distinct kinds of communication networks. They are LVDS and TTL, correspondingly.

LVDS stands for Low Voltage Differential Signaling, while TTL stands for Transistor- Transistor Logic. Devices which implement LVDS feature lengthier and more connections, while devices which use TTL have narrower and fewer links. LVDS uses reduced voltage values, while TTL employs large voltage levels. LVDS was intended to be more vulnerable to interference, while TTL is indeed not.

LVDS transmits data in sequential mode and can merge multiple signals into just one, whereas TTL data transmission in parallel mode. Differential signals vary from traditional single-ended signals in that they require two complementary wires to deliver a signal instead of just one.

Read this article to find out more about LVDS and TTL and how they are different from each other.

What is LVDS?

LVDS is an abbreviation for Low-Voltage Differential Signaling. It is a standard unit used to differentiate specific electrical features such as serial or differential transmission. It is often misunderstood as a protocol. LVDS uses twisted copper lines and needs little power and a high velocity to function. It is also employed on top of the OSI architecture as a data link layer.

Global Semiconductor developed LVDS in 1994, but it gained popularity in the 1990s. It is mostly used as a high-speed data transfer protocol in infotainment systems including such Liquid crystal display, PCs, tablets, video recorders, and other telecommunication technologies. The LVDS specification defines the electrical characteristics of an LVDS interface's receiver and transmitter. To transmit data at high rates, LVDS uses divergent signals with low voltage fluctuations.

Previously, among engineers, the word LVDS was often confused with Flat Panel Display Link. Before the introduction of LVDS, computer monitor resolutions lacked faster rates for images and films. In 1992, Apple Computer collaborated with National Semiconductor to build QuickRing, the very first LVDS application. It consisted of a high-speed video data auxiliary network.

LVDS is being employed in linking multiprocessing computers to replace Positive Emitter-Coupled Logic. Without signal conditioning, LVDS equipment can accept equalize and transmit up to several meters and offer a bandwidth less than 155.5 Megabits per second in a limited general interface.

What is TTL?

TTL is an abbreviation for transistor-transistor logic. It is included in electrical gadgets to render them sound-resistant. TTL is usually single-ended. TTL's reference is system ground. The terminal voltage can range between 0-0.8 volts to 2-5 volts. TTL operates on different levels of voltage than LVDS but acts on a similar principle. TTL is employed in long-distance communications. It is capable of removing electric potential, keeping just the power output from the driver's side.

TTL differential can create a current loop in a set of wires. Between both the receiver and the driver, the signal current should return to the ground connection. TTL represents a "1" or a "0" by the absence or presence of a voltage with reference to ground.

TTL logic relies on binary coding and the existence or lack of voltage. The reference system was the one that determined if the binary was 1 or 0. TTL suffers voltage spikes throughout data transmission, resulting in erroneous binary values. TTL doesn't really employ reduced voltage levels either. TTL transmits the data in a parallel mode. Its transmission mode requires a larger and greater number of cables. It cannot accommodate longer transmission distances.

TTL also lacks techniques for decreasing voltage levels. TTL's voltage level is set by the power source of the transistor. It has been standardized to about five volts over time. TTL devices often transmit data in parallel. This requires a huge number of cables since each signal needs its own wire. Since LVDS is sequential and integrates multiple signals into a single stream, it needs less wires than TTL.

Differences between LVDS and TTL

The following table highlights the major differences between LVDS and TTL −




Transmission distance

Transmission of distance is increased in LVDS.

Transmission distance is reduced in TTL.

Transmission mode

The mode of transmission is serial in LVDS.

Mode of operation in parallel in TTL

Energy usage

Power usage is minimal in LVDS

Power usage is high in TTL

point of reference

There is no utilization of the ground system for reference signals in LVDS

There is utilization of the ground system for reference signals in TTL.


LVDS used in high-speedbackplane transmissions, including such cabled, board, or clock distribution, and in components of communication and entertainment devices.

IBM developed the serial storage architecture


TTL uses the ground as a baseline, but LVDS does not. Reduced voltage levels are achievable with LVDS than with TTL. TTL is significantly more vulnerable to interference than LVDS. Longer cables can be employed in LVDS devices than that in TTL devices. LVDS-enabled equipment typically has fewer cables than TTL-enabled ones.

Although LVDS and TTL are contradictory, they can be converted. While LVDS and TTL are distinct signaling methods, special circuits can transform from one to the other.

These are employed to connect an LVDS device to a TTL device. Common devices typically vary in a few ways from those that employ LVDS and those that employ TTL.