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From Wikipedia, the free encyclopedia

A pinout diagram of a very common 555 timer integrated circuit showing its eight pins (numbered 1-8) and their corresponding functions ("ground", "trigger", "output", etc.)

In electronics, a pinout (sometimes written "pin-out") is a cross-reference between the contacts, or pins, of an electrical connector or electronic component, and their functions. "Pinout" now supersedes the term "basing diagram" which was the standard terminology used by the manufacturers of vacuum tubes and the RMA. The RMA started its standardization in 1934, collecting and correlating tube data for registration at what was to become the EIA. The EIA (Electronic Industries Alliance) now has many sectors reporting to it and sets what is known as EIA standards where all registered pinouts and registered jacks can be found.

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Transcription

Purpose

The functions of contacts in electrical connectors, be they power- or signaling-related, must be specified for connectors to be interchangeable. Each connector contact must mate with the contact on the other connector with the same function. If contacts of disparate functions are allowed to make contact, the connection may fail, and damage may result. Therefore, pinouts are a vital reference when building and testing connectors, cables, and adapters.

Suppose one has specified wires within a cable (for instance, the colored Ethernet cable wires in ANSI/TIA-568 T568A). In that case, the order in which different color wires are attached to pins of an electrical connector defines the wiring scheme. In any multi-pin connector, there are multiple ways to map wires to pins, so different configurations may be created that superficially look identical but function differently. Pinouts define these configurations. Many connectors have multiple standard pinouts in use for different manufacturers or applications.[1]

Terminology

While one usage of the word pin is to refer to electrical contacts of, specifically, the male gender, its usage in pinout does not imply gender: the contact-to-function cross-reference for a connector that has only female socket contacts is still called a pinout.

Representation

The pinout can typically be shown as a table or diagram. However, it is necessary to clarify how to view the diagram, stating if it shows the backside of the connector (where wires are attached) or the "mating face" of the connector. Published pinouts, which are particularly important when different manufacturers want to interconnect their products using open standards, are typically provided by the connector or equipment manufacturer. However, some pinouts are provided by 3rd parties since the manufacturer does not well document some connectors.

While repairing electronic devices, an electronics technician uses electronic test equipment to "pin out" each component on a PCB. The technician probes each pin of the component in turn, comparing the expected signal on each pin to the actual signal on that pin.

Example pinouts

USB pinout

Viewed from the front (outside) of Female Type A USB receptacle:

  1. +5V (Red)
  2. −Data (White)
  3. +Data (Green)
  4. GND (Black)

PS/2 pinout

PS/2 connector pinout
Pin number Name Purpose
1 DATA Data
2 Not used
3 GND Ground
4 Vcc +5V Common-collector voltage
5 CLK Clock signal
6 Not used

4017 decade counter

4017 pinout
4017 pinout
Pin number Name Purpose
1 6 The 6th sequential output
2 2 The 2nd sequential output
3 1 The 1st sequential output
4 3 The 3rd sequential output
5 7 The 7th sequential output
6 8 The 8th sequential output
7 4 The 4th sequential output
8 0 V, VDD The connection to the 0 V rail
9 9 The 9th sequential output
10 5 The 5th sequential output
11 10 The 10th sequential output
12 CO Carry out output - outputs high on counts 0 to 4, outputs low on counts 5 to 9 (thus a transition from low to high occurs when counting from 9 back to 0)
13 EN Latch enable - latches on the current output when high (i.e., the chip counts when EN is low)
14 CLK Clock in
15 RST Reset - sets output 1 high and outputs 2 through 10 low, when taken high
16 +9 V, VCC The connection to the +VCC rail (voltage between +3 V and +15 V)

LM741 operational amplifier

See also

References

  1. ^ "Handbook of hardware schemes, cables layouts and connectors". pinouts.ru. Retrieved 2016-04-25.

External links

This page was last edited on 27 April 2023, at 23:22
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