74ACT16841DLR

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The 74ACT16841DLR is a low-voltage BiCMOS octal bus transceiver designed for popular bus orientations on personal computers and other systems. The circuit contains eight non-inverting bus transceiver elements, with separate Port A and Port B inputs and outputs. The device is configured as two 4-bit buffers with separate Output Enable (OEAB and OEBA) and Direction (DIRB, DIRA) controls for each buffer.

All inputs are TTL compatible and, as with all ACT family devices, VCC is connected to VDD for low power consumption. This transceiver device is a dynamic latch where the output enables (OEAB and OEBA) must be changes in pulses for proper operation. This is different from a static level input device where the output enable is held at a constant level. The data the device will latch or store is the logic state at the changing of the output enable and direction control signals.

74ACT16841DLR devices have applications in buses, memory address and data registers, multiplexers/demultiplexers and ALU control busses. They are commonly used to turn on/off the communication interface between two systems (ie, between a controller and an actuator). They are also used to minimize interference and power loss when a system is in quiescent mode.

74ACT16841DLR have a typical operating temperature range of 00C to 85C, an operating voltage range of 3V to 5.5V, a propagation delay time of 8.5ns, a power dissipation of 140 mW and an output drive of up to 24mA. 74ACT16841DLR devices are available in several packages, including 8-lead SOIC, 16-lead SOIC, 16-lead TSSOP and 20-lead QSOP packages, in which each transceiver occupies 2 or 4 pins.

The principle of operation of 74ACT16841DLR is based on their latch function. A latch is a digital logic circuit constituted by two input signals (Data and Enable) and one output. When the Enable signal is high, the contents of the Data signal will be stored in the Latch output. When the Enable signal is low, the Latch output will remain the same, whatever the contents of the Data input is. The high Enable signal acts as a memory element, while the low Enable signal serves as a data input port. This operation is sometimes referred to as storing data in the Latch circuit.

74ACT16841DLR are well-suited for low-power and low-voltage requirements in system designs. This type of device helps minimize time-delays and power waste due to its atomic latch functionality. This type of device is more efficient than its static level input counterparts (often referred to as pass tranistors). In addition, since the output enables must be changed in pulses for proper operation, the device also provides protection from unintentional data loading.

Due to their dynamic latch functionality and wide range of voltage and temperature ranges, 74ACT16841DLR devices can be used in a variety of applications, such as logic level translation, system digital logic, multiplexing and communications interfacing. Due to their low power requirements, they are also suitable for applications using low-power devices. Furthermore, due to their wide range of packages, they can be used with ease in both surface mount and through hole boards.

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