74ACT11257DBR

Series:	74ACT
Packaging:	Tape & Reel (TR)
Part Status:	Obsolete
Type:	Multiplexer
Circuit:	4 x 2:1
Independent Circuits:	1
Current - Output High, Low:	24mA, 24mA
Voltage Supply Source:	Single Supply
Voltage - Supply:	4.5 V ~ 5.5 V
Operating Temperature:	-40°C ~ 85°C
Mounting Type:	Surface Mount
Package / Case:	20-SSOP (0.209", 5.30mm Width)
Supplier Device Package:	20-SSOP
Base Part Number:	74ACT11257

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74ACT11257DBR Application Field and Working PrincipleLogic and signal switches, multiplexers, decoders have been key components in the control of information in data-driven systems. The technology has developed and advanced in recent years, and communication, consumer, industrial and automotive markets are incorporating high speed logic and signal switching. The 74ACT11257DBR from Texas Instruments, is a quad differential bus transceiver designed for data communications applications such as high speed synchronous, asynchronous and bi-directional asynchronous protocols. This article explains the applications field of the 74ACT11257DBR, as well as its working principle.

Application Field

The applications of the 74ACT11257DBR include:

• Bi-directional Data Transmission and Reception: Enable data to be transmitted and received across a communication line without additional components.
• Data Bus Interface: Provide interface between the data bus and system control, and assist the synchronization of clocks between two buses.
• Bi-directional Bus Buffers: Allow for transactions between two or more communication points on a data bus and are usually used at the ends of communication lines for transmission and reception.
• Data Transfer Synchronization: Synchronize data between two remote data buses, even when the clock frequency differs between them.

The 74ACT11257DBR is mainly used in computer, communications, instrumentation and industrial control systems, as well as in serial data transmission synchronous control protocols.

Working Principle

The 74ACT11257DBR is a quad differential bidirectional transceiver and receiver. It can transmit and receive 4-bit buffers of data on different buses simultaneously, providing a dynamic bus interface. Its working principle is based on a "bus on voltage" design.Its working principle involves a transmit/receive clock input. In the transmit mode, data is loaded into the transmit buffer at the rising edge of the clock and is then sent to the receiver on the rising edge of the clock. In the receive mode, data is loaded into the receive buffer at the rising edge of the clock and is then transmitted to the host system.The logic levels of the data buses are used to identify which channels are in transmit and receive modes. When the channel is in transmit mode the logic level will be high, and low when it is in receive mode. The transmit/receive modes can be changed dynamically by switching the logic levels of the data buses.The 74ACT11257DBR uses an enable/disable feature, allowing the transmitter to be disabled when it is not in use. This feature helps reduce power consumption and data contention.

Conclusion

The 74ACT11257DBR is a versatile quad differential bus transceiver designed to enable data communication between data buses. Its "bus on voltage" design maximizes data transfer efficiency while enabling bi-directional and asynchronous communication. Its enable/disable feature allows it to be used in low-power applications and reduces data contention. Its application field includes bi-directional data transmission, data bus interface and data transfer synchronization, and is ideal for computer, communications and instrumentation and industrial control applications.

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