SN74LVT244BNSR

This octal buffer and line driver is designed specifically for low-voltage (3.3-V) VCC operation, but with the capability to provide a TTL interface to a 5-V system environment. The SN74LVT244B is organized as two 4-bit line drivers with separate output-enable (OE) inputs. When OE is low, the device passes data from the A inputs to the Y outputs. When OE is high, the outputs are in the high-impedance state. To ensure the high-impedance state during power up or power down, OE should be tied to VCC through a pullup resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver. This device is fully specified for hot-insertion applications using Ioff and power-up 3-state. The Ioff circuitry disables the outputs, preventing damaging current backflow through the device when it is powered down. The power-up 3-state circuitry places the outputs in the high-impedance state during power up and power down, which prevents driver conflict.

Applications

• Signal buffering
• Line driving
• TTL interface conversion between 3.3V devices and 5V systems

Key features

• Supports Mixed-Mode Signal Operation (5-V Input and Output Voltages With 3.3-V VCC)
• Supports Unregulated Battery Operation Down to 2.7 V
• Typical V0LP (Output Ground Bounce) < 0.8 V at VCC = 3.3 V, TA = 25℃
• Ioff and Power-Up 3-State Support Hot Insertion
• Latch-Up Performance Exceeds 100 mA Per JESD 78, Class II
• ESD Protection Exceeds JESD 22 - 2000-V Human-Body Model (A114-A) 200-V Machine Model (A115-A) 1000-V Charged-Device Model (C101)