74ACQ244SJ

Series:	74ACQ
Packaging:	Tube
Part Status:	Obsolete
Logic Type:	Buffer, Non-Inverting
Number of Elements:	2
Number of Bits per Element:	4
Input Type:	--
Output Type:	3-State
Current - Output High, Low:	24mA, 24mA
Voltage - Supply:	2 V ~ 6 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:	74ACQ244

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Introduction

The 74ACQ244SJ is an integrated circuit (IC) designed for digital logic operations using TTL logic technology. This dual 4-bit buffer/driver is designed to support high speed data transfer utilizing TTL logic thresholds and power supply voltage levels. It features two 4-bit non-inverting buffers with output tristate control. It is well suited for high-speed data bus applications such as SystemCBus or ISA expansion buses, as well as low-power logic circuits.

Classification

The 74ACQ244SJ is classified as a logic-level buffer, driver, receiver, and transceiver. A buffer is a gate or amplifier which preserves the signal level, shape and timing from the input to the output with minimal distortion. A driver is the electronic circuit that passes state information from one of the logic blocks inside the IC to the output with minimal distortion. A receiver is an electronic device that accepts the logic signal from the driver and converts it into a digital signal for further processing. A transceiver is an integrated circuit that is designed to provide both receiver and transmitter functions.

Functional Diagram

The 74ACQ244SJ IC contains two 4-bit latches; each latch has four input pins and four output pins. The input pins are labeled A0-A3 and B0-B3. Each input can be connected to a range of logic levels including TTL and 5V. The output pins are labeled Y0-Y3 and Z0-Z3. The output is dependent on the logic level of the input. When the latch is enabled, the output will match the input. When the latch is disabled, the output is in a tri-state condition and can be used to drive other logic circuits.

Applications

The 74ACQ244SJ is suitable for use in control logic, data processing and communications systems. It is ideal for use in ISA (Industry Standard Architecture) and SystemCBus applications where multiple devices must be synchronized with minimal latency. It is also well suited for low-power logic circuits; its low power mode reduces power consumption while still providing reliability and precision in the digital logic operations.

Working Principle

The 74ACQ244SJ performs digital logic operations by utilizing TTL logic thresholds and power supply voltage levels. The latch is designed to accept a logic input, store it in a memory, then output a logic level based on the stored information. The logic level accepted by the latch is a combination of TTL and 5V logic. When the latch is enabled, the output level will match the input level. When the latch is disabled, the output is in a tri-state condition and the output will be based on the combination of the input and what is stored in the memory.

Conclusion

The 74ACQ244SJ is a dual 4-bit buffer/driver designed for high-speed data transfer utilizing TTL logic thresholds and power supply voltage levels. It is classified as a logic-level buffer, driver, receiver, and transceiver. The IC is well suited for applications such as SystemCBus or ISA expansion buses as well as low-power logic circuits. It is also suitable for use in control logic, data processing, and communications systems. The 74ACQ244SJ is a powerful and accurate IC that is capable of addressing the most demanding digital logic operations.

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