74LS240 DIP Octal Buffer and Line Driver with Inverting 3-State Outputs
The 74LS240 is a high speed TTL integrated circuit designed specifically to improve the performance and density of 3-state memory address drivers, clock drivers, and bus-oriented receivers. This device contains eight independent inverting buffers organized as two groups of four. Each group is controlled by its own output-enable (G) input, providing the flexibility needed to manage multiple data paths on a single bus.
When the output-enable input is low, the device passes inverted data from the inputs to the outputs. When the output-enable is high, the outputs are placed in a high-impedance state, effectively isolating the device from the bus. The 74LS240 is engineered with high-current drive capabilities, making it ideal for driving heavily loaded backplanes or long transmission lines while maintaining sharp signal transitions and high noise immunity.
KEY FEATURES
- Octal inverting buffers for high-density bus applications
- 3-state outputs for direct interface with system buses
- Split into two 4-bit sections with independent enable controls
- High-current sink and source capability for driving long lines
- Low power Schottky technology for high speed and efficiency
- Standard 20 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 10ns
- High Level Output Current -15mA
- Low Level Output Current 24mA
- Input Voltage High 2.0V Minimum
INTERFACES
- 1A1 to 1A4 Data inputs group 1
- 2A1 to 2A4 Data inputs group 2
- 1G BAR Output enable group 1 active low
- 2G BAR Output enable group 2 active low
- 1Y1 to 1Y4 Inverted outputs group 1
- 2Y1 to 2Y4 Inverted outputs group 2
- VCC Positive supply voltage
- GND Ground reference
