The HD74HCT244FPEL-E is an octal buffer/line driver with three-state outputs manufactured by Renesas Electronics America. This device features TTL-compatible inputs and CMOS outputs, making it suitable for interfacing between TTL and CMOS logic systems. It provides high-speed performance while maintaining low power consumption.

Applications

• Memory address drivers
• Clock drivers
• Bus-oriented applications in mixed TTL/CMOS systems
• Data transmission between TTL and CMOS logic levels
• Peripheral drivers in TTL/CMOS systems

Features

• TTL input level compatibility: VIH = 2.0 V (min.), VIL = 0.8 V (max.)
• High-speed operation: tpd = 15 ns (typ.) at VCC = 5V
• Low power dissipation: ICC = 4 μA (max.) at Ta = 25°C
• High output drive capability: 15 LSTTL loads
• Symmetrical output impedance: |IOH| = IOL = 6 mA (min.)
• Wide operating voltage range: VCC = 4.5 to 5.5 V
• Three-state outputs

Benefits

• Seamless interface between TTL and CMOS logic levels.
• Improved system performance due to high-speed operation.
• Reduced power consumption, leading to energy efficiency.
• High drive capability for driving multiple loads or long lines.
• Provides isolation between circuits when the output is disabled.
• Suitable for systems operating at 5V.

Additional Details

The HD74HCT244FPEL-E has two active-low output enable inputs (OE1 and OE2). When either OE1 or OE2 is HIGH, the outputs are in the high-impedance state. The device is supplied in a 20-pin SOP package.

Absolute Maximum Ratings: Supply Voltage (VCC): -0.5 to +7.0 V, DC Input Voltage (VI): -0.5 to VCC + 0.5 V, DC Output Voltage (VO): -0.5 to VCC + 0.5 V, Operating Temperature (Topr): -40 to +85 °C.