SN75138N

Series:	--
Packaging:	Tube
Part Status:	Active
Type:	Transceiver
Protocol:	--
Number of Drivers/Receivers:	4/4
Duplex:	Half
Data Rate:	--
Voltage - Supply:	4.75 V ~ 5.25 V
Operating Temperature:	0°C ~ 70°C
Mounting Type:	Through Hole
Package / Case:	16-DIP (0.300", 7.62mm)
Supplier Device Package:	16-PDIP
Base Part Number:	SN75138

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SN75138N Application Field and Working Principle

SN75138N is a type of interface device often used in automated systems. It is a member of the family of drivers, receivers, and transceivers, which constitute the basic elements of interface technology. It functions as an isolation element in signal isolation applications, for instance in field-bus systems. It is also used for signal level conversion, enabling direct connection of two dissimilar signal levels such as TTL and LVTTL.

SN75138N Application Field

SN75138N devices are used in a wide variety of applications, including industrial automation, computer networking, fault detection, and data acquisition. They are used to connect devices of varying signal levels, or to isolate one signal from another when the devices would otherwise interfere with each other. The amplified signal is also useful in applications that require the transfer of data over extended distances. This device is suitable for automotive, communications, and control applications, where it provides isolation and signal level conversion.

Working Principle

The SN75138N provides signal-level conversion from TTL, LVTTL, CMOS, and other levels to TTL, LVTTL, and CMOS levels. It also allows for signal isolation and buffering. The driver consists of three stages: an input, a power amplifier, and an output buffer that provides the amplified signal. The SN75138N requires a supply voltage between 3.3V and 5V, and can amplify signals up to 32V. It is operated in push-pull mode and has an output current of up to 4 mA. In addition, it has a bandwith of up to 500 MHz and can work at rates up to 1.25 MS/s.The receiver of the SN75138N is designed to be used with the driver section. It comprises two stages, a comparator, and an output buffer. The comparator is used to compare the input signal with two reference voltages, a top and a bottom reference. If the input signal is lower than the lower reference, the output of the comparator is a logical low, and if the input signal is higher than the upper reference, then the output is a logic high. This output is then buffered and sent to the output. Finally, the transceiver section of the SN75138N provides bidirectional signal conversion and isolation. It consists of a driver, a receiver, and an output buffer. The driver takes a TTL, LVTTL, or CMOS signal and converts it to the same level of voltage, thereby providing signal level isolation. The receiver takes this amplified signal and compares it with two reference voltages, top and bottom; the output is the logical result of this comparison. The output buffer then takes this logic result and converts it to the target signal level, either TTL, LVTTL, or CMOS. In summary, the SN75138N is an interface device that enables direct connection of different signal levels, or isolation of one signal level from another. It is used in a wide variety of applications, including industry automation and data acquisition, and offers a relatively high bandwith and data rate. The device consists of three main sections: a driver, a receiver, and a transceiver, each designed to provide signal-level conversion, isolation, or buffering. With the SN75138N, interface connectivity between devices of different signal levels has never been easier.

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