74HC244N (Octal Buffer / Line Driver with 3-State Outputs - 20-Pin DIP Package)

As your digital projects grow in complexity, you will eventually encounter a situation where a single microcontroller pin needs to "talk" to several different chips at once, or drive a signal down a long, noisy ribbon cable. A standard GPIO pin often lacks the current capacity to do this reliably, leading to corrupted data. The 74HC244 is the industry-standard solution. It is an octal (8-channel) non-inverting buffer and line driver. It takes weak incoming digital signals and outputs identical, highly driven versions of those signals with enough "muscle" to power through capacitive loads and long wires.

Like the quad-channel 74HC125, the true power of the 74HC244 lies in its 3-State (Tri-State) Outputs. The eight buffers are split into two independent banks of four, each controlled by its own Active-LOW Output Enable (OE) pin. When the enable pin is pulled Low, the buffers actively drive data onto the bus. When pulled High, the buffers completely disconnect, entering a "High-Impedance" state. This allows multiple devices to share the exact same 8-bit data bus without short-circuiting each other, making this chip absolutely mandatory for building custom memory expansions and DIY CPUs.

Key Features & Functional Advantages:

• 8-Bit Wide Data Path: Packs eight independent buffers into a single 20-pin package, perfectly sized to handle an entire byte of data simultaneously.

• Dual 4-Bit Banks: The eight channels are divided into two blocks of four. You can enable all 8 channels at once, or control the upper and lower "nibbles" independently using the two separate OE pins.

• Tri-State Outputs: Safely isolates your components by providing three distinct output states: High, Low, and High-Impedance (Disconnected).

• High-Speed CMOS (HC) Architecture: Operates flawlessly across a 2.0V to 6.0V range, drawing virtually zero quiescent current while providing blistering fast signal propagation.

• Breadboard Native (20-DIP): Sized to fit perfectly across the center trench of a standard solderless breadboard, allowing for rapid integration into classic 8-bit logic projects.

Perfect For:

• Data Bus Buffering: The absolute standard hardware for isolating a delicate CPU (like a Z80 or 6502) from the heavy electrical loads of a shared system data bus.

• Signal Boosting (Line Driving): Excellent for revitalizing weak SPI or parallel data signals before sending them down long cables to distant LCD screens or sensor arrays.

• Homebrew 8-Bit Computers: Frequently paired with 74HC374 or 74HC574 registers to control the flow of data moving in and out of the Arithmetic Logic Unit (ALU).

• Input Isolation: A highly reliable way to physically buffer and protect a microcontroller's input pins from raw, external switches or noisy industrial sensors.

Technical Specifications:

• Logic Family: 74HC (High-Speed CMOS)

• Logic Function: Octal Buffer / Line Driver (Non-Inverting)

• Number of Buffers: 8 (Octal)

• Output Type: 3-State (Tri-State / High-Impedance capable)

• Output Enable Logic: Active-LOW (Two independent enable pins controlling 4 buffers each)

• Operating Supply Voltage (Vcc): 2.0V to 6.0V

• Maximum Output Current: ~35 mA per pin

• Package / Case: 20-DIP (0.300", 7.62mm width)

• Mounting Type: Through-Hole (PTH)

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