SN74LVC244ADWR  DataSheet

Octal Buffer/Driver With 3-State Outputs SOIC (DW) |20

 Features:

• Operates From 1.65 V to 3.6 V
• Inputs Accept Voltages to 5.5 V
• Specified From -40°C to 85°C and -40°C to 125°C
• Max t_pd of 5.9 ns at 3.3 V
• Typical V_OLP (Output Ground Bounce) < 0.8 V at V_CC = 3.3 V, TA = 25°C
• Typical V_OHV (Output VOH Undershoot) > 2 V at V_CC = 3.3 V, TA = 25°C
• Supports Mixed-Mode Signal Operation on All Ports (5-V Input/Output Voltage With 3.3-V V_CC)
• Ioff Supports Partial-Power-Down Mode Operation
• Latch-Up Performance Exceeds 250 mA Per JESD 17
• ESD Protection Exceeds JESD 22
  • 2000-V Human-Body Model (A114-A)
  • 200-V Machine Model (A115-A)
  • 1000-V Charged-Device Model (C101

 DESCRIPTION/ORDERING INFORMATION:
This octal buffer/line driver is operational at 1.5-V to 3.6-V V_CC, but is designed specifically for 1.65-V to 3.6-V V_CC operation.

The SN74LVC244A 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.

Inputs can be driven from either 3.3-V or 5-V devices. This feature allows the use of this device as a translator in a mixed 3.3-V/5-V system environment.

To ensure the high-impedance state during power up or power down, OE should be tied to V_CC 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 partial-power-down applications using I_off. The I_off circuitry disables the outputs, preventing damaging current backflow through the device when it is powered down.

 link: http://focus.ti.com/docs/prod/folders/print/sn74lvc244a.html