74HC245 (Octal Bus Transceiver with 3-State Outputs - 20-Pin DIP Package)

While the 74HC244 is perfect for sending data in a single direction, many complex digital systems require components to both send and receive data over the exact same wires. If your microcontroller needs to write data to a memory chip and then read data back from that same chip a millisecond later, you need a two-way traffic controller. The 74HC245 is the industry-standard octal bus transceiver. It features eight parallel channels that can transmit data in either direction, completely eliminating the need to clutter your circuit board with separate input and output buffering chips.

The direction of the data flow is controlled by a single Direction (DIR) pin. Pulling it High sends data from Bus A to Bus B; pulling it Low reverses the flow from Bus B to Bus A. Like its one-way cousin, the 74HC245 features an active-low Output Enable (OE) pin. When this pin is pulled High, the chip entirely disconnects its outputs, entering a "High-Impedance" (Tri-State) mode. This safely isolates different segments of a shared data bus, preventing fatal short circuits when multiple chips attempt to communicate on the same lines simultaneously.

Key Features & Functional Advantages:

• Bi-Directional Data Flow: Features a dedicated DIR pin that instantly toggles the chip between transmitting and receiving data across all eight channels simultaneously.

• Tri-State Outputs: Safely isolates your components by providing a High-Impedance state, allowing multiple devices to share a main data bus without interference.

• 8-Bit Wide Data Path: Perfectly sized to handle a complete byte of data, making it the ideal companion for 8-bit microprocessors and parallel memory architectures.

• High-Speed CMOS (HC) Architecture: Operates flawlessly across a 2.0V to 6.0V range, combining the rapid switching speeds of TTL logic with the extreme power efficiency of modern CMOS.

• 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:

• Shared Data Buses: The standard hardware for isolating a delicate CPU from the heavy electrical loads of a shared system data bus in DIY 8-bit computer builds.

• Bi-Directional Logic Buffering: Easily revitalizes weak digital signals traveling in both directions down long ribbon cables or noisy PCB traces.

• Memory Interfacing: Mandatory for safely connecting RAM or EEPROM chips to a microprocessor where read and write operations happen on the exact same pins.

• Logic Isolation: A highly reliable way to physically isolate a programmer from the rest of the circuit while flashing a microcontroller.

Technical Specifications:

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

• Logic Function: Octal Bus Transceiver

• Number of Channels: 8 (Octal)

• Data Direction: Bi-Directional (Controlled by DIR pin)

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

• Output Enable Logic: Active-LOW

• 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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