SN75C188D

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An SN75C188D is a driver/receiver transceiver designed for use in low-power applications. It has a wide range of features, including dual power supply operation, low power operation, and the ability to drive up to 10mA of current. It is designed to interface with any TTL/CMOS logic family without requiring any external components.

The SN75C188D implements an open-collector structure and is capable of driving 30V and sourcing or sinking 10mA of maximum current. It consists of 2 drivers, 2 receivers, and a pair of active pull-ups. The drivers provide a differential sink or source current while the receivers sense a differentially transmitted signal level. The pull-up resistors force the output to logic high when the drivers are turned off, and can be disabled when not needed.

The SN75C188D has two power supply pins, an enable pin, and two distinct output pins. It can operate in both the active-low and active-high modes, with the enable pin being used to select between the two modes. When the enable pin is in the active-low mode, the output of the SN75C188D is either logic high or logic low based on the logic inputs. Conversely, when enable is in the active-high mode, the output of the SN75C188D is either logic high or logic low based on the logic inputs.

The SN75C188D provides circuit protection by using integrated diodes across the input pins to protect against excessive reverse input voltages and by using an open-collector topology that prevents short circuits when the output transceiver is in the disabled state. The protection diodes are required because the input voltage of the SN75C18D can be up to 30V, which can cause damage to other logic devices connected in parallel.

The applications of the SN75C188D include data transmission, interface logic, and signal conditioning. It can be used to interface with any logic family, such as ECL, TTL/CMOS, and CPLD, and it is ideal for applications where signals need to be transmitted and received in a noisy environment. The SN75C188D is also useful in industrial automation and robotics applications, as it can be used to control various types of motors.

In conclusion, the SN75C188D is an essential device for any low-power application. It provides a dual power supply operation capability, low operational power, and the ability to drive up to 10mA. Additionally, it is capable of interfacing with a variety of logic families and economical in terms of space and cost. Its applications include data transmission, interface logic, signal conditioning, industrial automation, and robotics.

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