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- Totem pole output vs open collector on encoder driver#
- Totem pole output vs open collector on encoder manual#
- Totem pole output vs open collector on encoder series#
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The first commercial integrated-circuit TTL devices were manufactured by Sylvania in 1963, called the Sylvania Universal High-Level Logic family (SUHL). Buie of TRW, which declared it, "particularly suited to the newly developing integrated circuit design technology." The original name for TTL was transistor-coupled transistor logic (TCTL). Even after Very-Large-Scale Integration (VLSI) CMOS integrated circuit microprocessors made multiple-chip processors obsolete, TTL devices still found extensive use as glue logic interfacing between more densely integrated components.Ī real-time clock built of TTL chips around 1979 TTL became the foundation of computers and other digital electronics. Some TTL chips are now also made in surface-mount technology packages. TTL devices were originally made in ceramic and plastic dual in-line package(s) and in flat-pack form. Variations of the original TTL circuit design offered higher speed or lower power dissipation to allow design optimization. TTL manufacturers offered a wide range of logic gates, flip-flops, counters, and other circuits.
Totem pole output vs open collector on encoder series#
The 7400 series by Texas Instruments became particularly popular. Īfter their introduction in integrated circuit form in 1963 by Sylvania Electric Products, TTL integrated circuits were manufactured by several semiconductor companies. Sometimes TTL-compatible logic levels are not associated directly with TTL integrated circuits, for example, they may be used at the inputs and outputs of electronic instruments. TTL integrated circuits (ICs) were widely used in applications such as computers, industrial controls, test equipment and instrumentation, consumer electronics, and synthesizers.
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Its name signifies that transistors perform both the logic function (the first "transistor") and the amplifying function (the second "transistor"), as opposed to resistor–transistor logic (RTL) or diode–transistor logic (DTL). Please refer to the table below for a simple example of a push-pull output.Transistor–transistor logic ( TTL) is a logic family built from bipolar junction transistors. In the off state it will supply a path to ground and in the on state it will supply Vcc.
Totem pole output vs open collector on encoder driver#
Please refer to the table below for a simple example of an open collector.Ī push-pull output is a combination of a line driver and an open collector. For proper operation, a sourcing input is required. When in the off state, an open collector will float. In the on state, an open collector will supply a path to ground. Please refer to the table below for a simple example of a line driver.Īn open collector is a sinking output. Because of this, a sinking input is required for proper operation. In the off state, a line driver will float. When in the on state, a line driver will supply Vcc.
Totem pole output vs open collector on encoder manual#
If you are working with an Industrial I/O Card, check the user manual for the best quadrature encoder type.Ī line driver is a sourcing output. The Push-Pull configuration does not float, it is always supplying Vcc or ground, which is why it will work best with a Multifunction DAQ card. SolutionFor most NI DAQ cards, a Push-Pull quadrature encoder is recommended since Multifunction DAQ card works best when it is constantly driven.