74AHC126S14-13

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74AHC126S14-13 is a small-sized, versatile, bidirectional dual-to-quad bus transceiver that belongs to a larger family of Logic - Buffers, Drivers, Receivers, Transceivers. This device is a member of the Advanced High-Speed CMOS Logic Family and is suitable for applications that require timing frequencies of up to 1MHz. It is designed to assist in the development of digital crosses and buses at 1MHz operating speeds and ideal for applications involving clock distribution, address bus multiplexing, and data bus arbitration.

This transceiver contains four separate optimized bidirectional level-translation bus drivers that can be paralleled for higher-current drive applications. The drivers are designed to convert one digital input signal into two outputs without level translation or buffering. The 74AHC126S14-13 has both active-high and active-low enable inputs to control the direction of data flow.

This transceiver allows the signal direction to be independently reversed with respect to the logic levels at the input, thereby eliminating the need to use an inverter. The device also has separate output-enable and active-low input enables that allow the outputs to be quickly controlled as a group.

The 74AHC126S14-13 operates from a single +5V power supply, with a low power-down mode. It also has input thresholds compatible with standard CMOS outputs, providing optimal speed performance. Additionally, it is available in the Low Voltage version (74LVX126S14-13).

74AHC126S14-13 Working Principle

The 74AHC126S14-13 operation is based on the four bidirectional buffer transceivers with enable controls. Each transceiver has two inputs, two outputs, and an enable pin. The inputs and outputs are open drain and the enable pin can be connected to the active high or active low logic to select the direction of data flow.

When the enable pin is driven high, data is transferred from the two inputs to the two outputs. When the enable pin is driven low, data is transferred from the two outputs to the two inputs. Since the data transfer direction is controlled by the enable pin, it can be used to multiplex data, enabling data to flow in one direction at a time.

There are two complete circuits that are composed of two bidirectional buffers each. The first circuit has two input pins (A1, A2) and two output pins (Y1, Y2). The second circuit has two input pins (B1, B2) and two output pins (Z1, Z2). There is a single enable pin (EN) that is common to both circuits.

When the enable pin is driven high, the two inputs of each circuit (A1, A2 and B1, B2) are connected to the two outputs (Y1, Y2 and Z1, Z2). In other words, when the enable pin is driven high, data is transferred from the inputs to the outputs. When the enable pin is driven low, the two outputs of each circuit are connected to the two inputs. In other words, when the enable pin is driven low, data is transferred from the outputs to the inputs.

This enables data to be transferred in either direction without the need for a level translator or an inverter. Additionally, the separate output-enable and active-low input enables allow the outputs to be quickly controlled as a group.

Applications

74AHC126S14-13 is used for a variety of applications that require fast data transfer at 1MHz, such as clock distribution, address bus multiplexing, and data bus arbitration. It is also used for data storage and processing in FPGAs, CPUs, and memories. Furthermore, it can be used to implement contact bounce suppression and active pull-ups and pull-downs to maintain signal integrity in a wide range of applications.

Other applications include serial and parallel bus interfacing and memory bus multiplexing. Additionally, the outputs can be used to provide assistive transponding operations to simplify data exchange, conversion, and control between microprocessors, bus control, TTY/RS-232 receivers, LCD/LED controllers, and other integrated circuits.

Conclusion

The 74AHC126S14-13 bidirectional dual-to-quad bus transceiver from the Logic - Buffers, Drivers, Receivers, Transceiver family is a versatile and low-power device, ideal for applications that require fast data transfer at 1MHz. It is composed of four bidirectional buffer transceivers, each with two inputs, two outputs, and an enable pin. With a single enable pin, it allows for bidirectional data transfer without the need for a level translator or an inverter.

The 74AHC126S14-13 is suitable for a wide variety of applications such as clock distribution, address bus multiplexing, data bus arbitration, data storage, and processing in FPGAs, CPUs, and memories. It is also used for contact bounce suppression and active pull-ups and pull-downs. Additionally, the outputs can be used to provide assistive transponding operations.

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