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Octal Buffer Line Driver IC - 74HC240

Octal Buffer Line Driver IC - 74HC240

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  • Typical propagation delay: 12 ns 
  • 3-STATE outputs for connection to system buses 
  • Wide power supply range: 2–6V 
  • Low quiescent supply current: 80 µA (74 Series).
  • Output current: 6 mA 

Octal Buffer Line Driver IC - 74HC240

The 74HC series 74HC240 3-STATE buffer utilizes advanced silicon-gate CMOS technology. It possesses high drive current outputs which enable high-speed operation even when driving large bus capacitances. These circuits achieve speeds comparable to low-power Schottky devices while retaining the advantage of CMOS circuitry, i.e., high noise immunity and low power consumption. It has a fanout of 15 LS-TTL equivalent inputs.

The 74HC240 is an inverting buffer and has two active LOW enables (1G and 2G). Each enables independent controls with 4 buffers. All inputs are protected from damage due to static discharge by diodes to VCC and the ground.

check out : Hex Inverter Buffer IC - 74HC06


Pinout of 74HC240 IC

Package Includes:

  • 1 x IC - 74HC240


Supply Voltage (VCC − 0.5 to + 7.0V 
Input Voltage (VIN) −1.5V to VDD + 1.5V
Output Voltage (VOUT) − 0.5 to VCC + 0.5V
Clamp Diode Current (IIK, IOK)  ± 20 mA
DC Output Current, per pin (IOUT) ± 35 mA
DC VCC or GND Current, per pin (ICC) ± 70 mA 
Storage Temperature Range (TSTG) − 65°C to + 150°C 
Power Dissipation (PD) (Note 4) 600 mW
S.O. Package only 500 mW
Lead Temperature (TL) (Soldering 10 seconds)  260°C

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1.What is the function of the 74HC240 IC? 

  • The 74HC240 integrated circuit is an octal buffer/line driver with three output states. It is commonly used to drive LEDs, displays, and other output devices in digital circuits.

2.How is the 74HC240 different from the 74HC244 IC? 

  • The 74HC240 and 74HC244 are both octal buffer/line driver ICs with three-state outputs, but their functions differ. The 74HC240 is a non-inverting buffer, which means that the output pins always follow the input pins. The 74HC244 is an inverting buffer, which means that its output pins are the complement of its input pins. The 74HC244 also has two additional input pins, allowing it to be used in a bi-directional bus system.