SN74ABTH245DWRG4

Series:	74ABTH
Packaging:	Tape & Reel (TR)
Part Status:	Active
Logic Type:	Transceiver, Non-Inverting
Number of Elements:	1
Number of Bits per Element:	8
Input Type:	--
Output Type:	3-State
Current - Output High, Low:	32mA, 64mA
Voltage - Supply:	4.5 V ~ 5.5 V
Operating Temperature:	-40°C ~ 85°C (TA)
Mounting Type:	Surface Mount
Package / Case:	20-SOIC (0.295", 7.50mm Width)
Supplier Device Package:	20-SOIC
Base Part Number:	74ABTH245

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Introduction

SN74ABTH245DWRG4 is a non-inverting octal bus transceiver, incorporated into Texas Instruments’ Logic - Buffers, Drivers, Receivers, and Transceivers product family. This component is ideal for usage in applications that require the ability to send or receive digital data. This is achieved through the component’s active-low output-enable function and Latched Inputs. As with many transceivers, the SN74ABTH245DWRG4 is also operates as two 8-bit buffers - one for the sending of the data, and one for the receiving of the data. This article aims to discuss the application fields and working principles of this component.

Application Fields

The SN74ABTH245DWRG4 can be used in a variety of data transmission applications. These include, but are not limited to, communication between two complementary processor buses, handshaking between processors, electrically isolating a processor. Additionally, the component can be used to send and receive information to printed circuit boards (PCBs) and other system-level sources. The FET outputs of the component provide fast switching, consuming little power and require no external drivers.Another application of the SN74ABTH245DWRG4 is in low-profile, memory applications. Its low profile helps minimize the size of printed boards, allowing manufacturers to engage in creative designs while still preserving flexibility. The component can also work with different power levels, thanks to the source and sunk outputs that protect data by requiring that both inputs and outputs are active.

Working Principle

The SN74ABTH245DWRG4 is composed of two independent octal bus transceivers, each with an active-low output-enable (OE) input. The sending channel includes a 8-bit bidirectional latch to provides a buffer for data reception. The receiving channel includes two 8-bit latched inputs. A low signal level on the OE input of either channel allows the data in the corresponding latch register to be transmitted on the transceiver outputs. A high signal level on the OE input will disable the associated outputs, but has no effect on the latch register. Conveniently, the sending channel provides true and complement outputs of each level to allow easy bi-directional communication. Data reception is accomplished via buffers that use a latch-storage structure. The outputs of the receiving channel willl go to their latched states when the associated input levels are low and the OE inputs are low, allowing data to the transmitted. This is a highly effective method of both sending and receiving data quickly.

Conclusion

The SN74ABTH245DWRG4 is a versatile transceiver, incorporating two 8-bit buffers and an active low output-enable function into its design. This allows for fast and easy data transmission and reception. The component can be used in a variety of applications, including data transmission between interconnects and PCBs, memory applications, and handshaking between processors. Although the component is housed in a compact form factor, the SN74ABTH245DWRG4 promises to be highly effective as a bus transceiver.

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