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The G74SC240P is a high-speed Schottky TTL (Transistor-Transistor Logic) octal buffer/line driver with 3-state outputs, manufactured by GTE (GTE Microcircuits Division).

Key Specifications:

• Logic Family: Schottky TTL (74S series)
• Function: Octal Buffer/Line Driver
• Output Type: 3-State (High, Low, High-Impedance)
• Number of Channels: 8 (Octal)
• Input Compatibility: TTL (5V logic levels)
• Supply Voltage (Vcc): 4.75V to 5.25V (Standard TTL range)
• Propagation Delay: ≈5ns (typical for 74S series)
• Output Current (High/Low): -1mA / 20mA (sink/source capability)
• Operating Temperature Range: 0°C to +70°C (Commercial grade)
• Package Type: 20-pin DIP (Dual In-line Package)

Descriptions & Features:

• Designed for bus-oriented applications where multiple devices share a common bus.
• 3-state outputs allow multiple drivers to be connected to a shared bus without interference.
• Schottky-clamped for high-speed operation (faster than standard TTL).
• Inverting logic (output is the inverse of input).
• High drive capability for driving heavily loaded lines.
• Wide operating voltage range ensures compatibility with standard TTL systems.

Applications:

• Bus buffering in microprocessor systems.
• Memory address/data line driving.
• General-purpose logic interfacing.

This IC is now considered obsolete, as it belongs to the older 74S TTL series, but was widely used in early digital systems.