SN74ABT8646DLG4

Series:	74ABT
Packaging:	Tube
Part Status:	Active
Logic Type:	Scan Test Device with Bus Transceiver and Registers
Supply Voltage:	4.5 V ~ 5.5 V
Number of Bits:	8
Operating Temperature:	-40°C ~ 85°C
Mounting Type:	Surface Mount
Package / Case:	28-BSSOP (0.295", 7.50mm Width)
Supplier Device Package:	28-SSOP
Base Part Number:	74ABT8646

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Introduction

The SN74ABT8646DLG4 is a CMOS buffer gate featuring advanced threshold logic (ATL), a high-speed logic family ideal for use in high-speed logic circuits. It is a high-speed, low-power device combining high noise margin, low power consumption and low threshold levels, hence allowing a wide input common mode range. Its application fields and working principles are explained in the article below.

Application Fields

The SN74ABT8646DLG4 is mainly used in various logic circuits as both a line driver and a high-speed bus receiver. Modes of operation and logic states are selectable by the circuit settings in which the device is applied. Typical applications include multiplexers, decoders, power-on reset circuits and address decoding.

Working Principle and Design

The SN74ABT8646DLG4 consists of two independent ATL gates (Gate A and Gate B) that feature a single output. Each ATL gate has two input pins and one output pin. All inputs of both Gates A and B are designed to work with 0V to 7V input voltage common mode range and have an output current source of -6mA up to 6mA.The logic levels of the ATL gates are compatible with TTL logic levels, giving them similar versatility in application. The output pins provide an active low-true output, meaning that the output is high until the desired logic level is reached in the inputs of the gate, at which point the outputs will switch to a low level.In addition to the two ATL gates, the SN74ABT8646DLG4 also features two complementary logic inputs (active low and active high, respectively). These two complementary logic inputs allow the user to select either of the two logic state modes of operation. The active low logic input allows the user to select a positive logic mode of operation by taking the input signal low and consequently allowing the output to be high when the triggering signal is present. Alternatively, the active high input allows the user to select an inverted logic mode of operation by taking the input signal high and corresponding output to be low when the triggering signal is present.

Conclusion

The SN74ABT8646DLG4 is an advanced threshold logic device combining high noise margin and low power consumption. It is ideal for use in high-speed logic circuits and is typically used as a line driver and bus receiver. Its two ATL gates feature two input pins and one output pin, as well as two complementary logic inputs for selecting between two different logic state modes of operation. Its variety of features and broad input common mode range make it an ideal choice for multiplexers, decoders, power-on reset circuits and address decoding.

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