SN74LV138ATRGYRG4

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The SN74LV138ATRGYRG4 integrated logic circuit is a specialized signal switching device that belongs to the Logic - Signal Switches, Multiplexers, and Decoders category. This device is a 3-to-8 line Decoder/Demultiplexer. It has a wide range of applications and a simple triple level decode operations.

This integrated logic circuit is designed to decode three binary address inputs, A, B and C, into eight mutually exclusive outputs, O0 to O7. The outputs can be used as address sources to enable corresponding memories and other digital devices. The SN74LV138ATRGYRG4 can be used in a variety of applications where it is necessary to select one of a number of possible sources of data.

Features

• Triple–level decode function
• High fan-out for data bus enabling
• 28V ±22V TTL and LVTTL inputs
• Internal Input Pull–up Resistors
• Output drive capability of 32 TTL loads
• Outputs can be wired-ANDed
• High speed: tPD = 12 ns
• Operating voltage range: 2.7V to 3.6V
• Green product and no Sb/Br

Pinout and Pin Description

The SN74LV138ATRGYRG4, like all integrated logic circuits, has a variety of pin configurations. Each pin has a specific job to perform. The input pins, such as A and B, are used to receive data from previous parts in the circuitry. The output pins, such as O0 to O7 are used to send data to the next parts of the circuitry.

The SN74LV138ATRGYRG4 has a 16-pin Dual-In-Line configuration. The pins from 1 to 8, from left to right, are A, B, C, C1, O0, O1, O2, and Y7. The pins from 9 to 16, from left to right, are D7, D1, D2, D3, O3, O4, O5, and O6.

Application Field

The SN74LV138ATRGYRG4 is ideal for use in memory decoding, address selection and data filtering applications. It can be used as a part of a microprocessor application, or it can be used as a width expansions of address buses and data buses. Other applications include address decoding, clock decoding, and use in shift register circuits. The power consumption at maximum output data rate is 50 mW, so this device is compatible with the wide range of digital systems with power sensitive environment.

Working Principle

The SN74LV138ATRGYRG4 logic circuit works by decoding three binary address inputs and generating eight mutually exclusive outputs. This process is performed using two levels of logic. The first level is the two-to-four-line decoder, which is enabled by the C1 input. If C1 is at high (1), the decoder is enabled and the A, B and C inputs act as two-line inputs, A, B and their complements. The outputs of the two-to-four decoder are D0-D3, which act as inputs to the three-to-eight decoder, and the outputs of the three-to-eight decoder are O0-O7.

The second level is the three-to-eight line decoder, which is enabled by the C1 input. If C1 is at low (0), the encoder is enabled and the A, B and C inputs act as three-line inputs, A, B and C. The outputs of the three-to-eight decoder are O0-O7 and are controlled by A, B and C. The SN74LV138ATRGYRG4 can also be used as a two-to-four line decoder.

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