74LS253 DIP Dual 4-Line to 1-Line Data Selector/Multiplexer with 3-State Outputs

The 74LS253 is a high speed TTL integrated circuit containing two independent 4-line to 1-line data selectors/multiplexers. Each of the two sections features its own 3-state output and separate output enable control, while sharing common binary select inputs (S0 and S1). This dual configuration allows the device to process two separate bits of data simultaneously, making it highly efficient for multi-bit data routing and bus-organized systems.

The 3-state outputs are a key feature of the 74LS253, allowing the outputs to be placed in a high-impedance state when the respective output enable is high. This enables multiple multiplexer outputs to be connected directly to a common bus without the need for additional interface logic. It is commonly used for data routing, parallel-to-serial conversion, and as a versatile boolean function generator. Its low power Schottky design ensures high-speed switching with minimal power consumption, suitable for computer architecture and industrial control logic.

KEY FEATURES

• Dual 4-channel to 1-channel data selection in a single package
• 3-state outputs for seamless integration with system buses
• Independent output enable controls for each multiplexer section
• Common select inputs to simplify control logic for 2-bit words
• Low power Schottky technology for high speed and low thermal overhead
• Standard 16 pin dual in line package

SPECIFICATIONS

• Supply Voltage 4.75V to 5.25V
• Operating Temperature 0 to 70 Celsius
• Logic Type TTL Low Power Schottky
• Typical Propagation Delay 18ns
• High Level Output Current -2.6mA
• Low Level Output Current 24mA
• Input Voltage High 2.0V Minimum

INTERFACES

• 1I0 to 1I3 Data inputs for multiplexer 1
• 2I0 to 2I3 Data inputs for multiplexer 2
• S0 S1 Common binary select inputs
• 1G BAR Output enable for multiplexer 1 active low
• 2G BAR Output enable for multiplexer 2 active low
• 1Y Output for multiplexer 1
• 2Y Output for multiplexer 2
• VCC Positive supply voltage
• GND Ground reference