SN74LVT244BDB

3.3 -V ABT八路缓冲器/驱动器，具有三态输出 3.3-V ABT OCTAL BUFFER/DRIVER WITH 3-STATE OUTPUTS

description/ordering information

This octal buffer and line driver is designed specifically for low-voltage 3.3-V VCCoperation, 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 OEis high, the outputs are in the high-impedance state.

To ensure the high-impedance state during power up or power down, OEshould 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 Ioffcircuitry 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.

Supports Mixed-Mode Signal Operation5-V Input and Output Voltages With 3.3-V VCC

Supports Unregulated Battery Operation Down to 2.7 V

Typical VOLPOutput Ground Bounce <0.8 V at VCC= 3.3 V, TA= 25°C

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