74F244 Octal Buffers/Line Drivers with 3 State Outputs IC (74244) DIP 20 Package

74F244 Octal Buffers/Line Drivers with 3 State Outputs IC (74244) DIP 20 Package

The 74F244 (equivalent to 74244) is an octal (8-bit) buffer and line driver IC designed for high-speed data transfer and bus interfacing in digital systems.
It provides non-inverting, three-state outputs, allowing the device to connect directly to system buses while preventing bus contention.

It contains two groups of four buffers, each with its own active-LOW enable input (1OE and 2OE), which allow independent control of data flow.
This IC belongs to the FAST TTL (F-series) family, which offers very high speed and strong output drive capability compared to LS (Low Power Schottky) or HC (High-Speed CMOS) logic families.

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Features :-

• Octal bus interface
• 3-State output buffer sink 64mA
• 15mA source current
• Guaranteed output skew less than 2.0ns (74F244B)
• Reduced ground bounce (74F244B)
• Reduced ICC (74F244B)
• Reduced loading (74F244B IIL = 40?A)
• Split lead frame offers increased noise immunity (74F244B)
• Industrial temperature range available (-40°C to +85°C) for 74F244
• 74F244 available in SSOP Type II package

Specifications :-

• Supply voltage : 4.5V – 5.5V
• High-level input voltage : 2.0V
• Low-level input voltage : 0.8V
• Input clamp current : -18mA
• High-level output current : -15mA
• Low-level output current : 64mA
• Operating free-air temperature : +70°C

Functional Description

• The 74F244 acts as a bus driver or signal buffer, designed to minimize loading effects and improve signal integrity when driving large data buses.
• Each group of four buffers is controlled by its own enable input:
• When OE = LOW, the corresponding outputs follow the inputs.
• When OE = HIGH, the corresponding outputs go into high-impedance (Hi-Z), effectively disconnecting them from the bus.
• This tri-state feature makes it ideal for systems with shared data lines.

Applications

• Bus driver or buffer in microprocessor/memory systems
• Signal amplification for long PCB traces or cables
• Peripheral device interfacing
• Data bus isolation
• Backplane driving in computer systems
• Address and data line buffering
• Bidirectional bus systems (with complementary ICs like 74F245)