74ACTQ245SJX

Series:	74ACTQ
Packaging:	Tape & Reel (TR)
Part Status:	Obsolete
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:	24mA, 24mA
Voltage - Supply:	4.5 V ~ 5.5 V
Operating Temperature:	-40°C ~ 85°C (TA)
Mounting Type:	Surface Mount
Package / Case:	20-SOIC (0.209", 5.30mm Width)
Supplier Device Package:	20-SOP
Base Part Number:	74ACTQ245

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Logic buffers, drivers, receivers, transceivers are components used to isolate and amplify a digital signal. The 74ACTQ245SJX is a low-voltage, low power, quad bus transceiver with 3-state output and byte select inputs. This device is commonly used in applications where data is transmitted and received between two asynchronous devices such as FPGAs, microcontrollers, and ASICs. This article will discuss the application field and working principle of the 74ACTQ245SJX.
The 74ACTQ245SJX is a bidirectional non-inverting bus transceiver which operates at 3.3 volts. The device contains four independent transceivers, each of which consists of two separate voltage level converters connected back to back. It operates in two states: active and three-state. In the active state, the transceiver is enabled by setting the BSRnbar inputs HIGH, thereby allowing data to be transferred between ports A and B. In the three-state state, the transceiver is disabled by setting the BSRnbar inputs LOW, thereby isolating ports A and B from each other.
The 74ACTQ245SJX is well-suited for applications where the sending and receiving devices run on separate voltages, typically 3.3 V and 5 V. It is commonly used in memory data transfer applications, such as DIMM and SRAM, and can be used for interfacing between logic families including CMOS, TTL, ECL, PCM, and LVDS.
The 74ACTQ245SJX has eight pins and an eight-bit wide data bus. It operates on an asynchronous interface that allows two devices to communicate without the need for a common clock signal. This is achieved by having one device write data to the signals, and the other device read the data from the signals. A byte select control input (BSRnbar) is provided to allow individual bits or bytes to be selected for data transfer.
The 74ACTQ245SJX is an open-collector and open-drain device. This means that it TTL is not provided with a voltage level and no current flows through the device during its operation. Instead, it relies on the external Pull-up resistor to provide the required logic high level and the external Pull-down resistor to provide the required logic low level.
The 74ACTQ245SJX works in three states: high, low, and high impedance. When in the low state, the signal is pulled low by the internal pull-down transistors, resulting in a logic zero being sent. When in the high state, the signal is pulled high by the internal pull-up transistors, resulting in a logic one being sent. When in the high impedance state, the signal is neither pulled high nor low, resulting in a high impedance state or a logic high or logic low, depending on the state of the external pull-up or pull-down resistors. This can be used to disable the device.
The 74ACTQ245SJX is an ideal solution for applications where data needs to be transferred between devices running on different voltages or logic families. It is well-suited for asynchronous memory data transfer applications such as DIMM and SRAM, and its simple byte select control input gives it an edge when interfacing a variety of logic families. In addition to this, the device’s three-state outputs make it easy to disable the device when not in use, giving the design more flexibility.

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