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1FEATURES

2? Members of the Texas Instruments Widebus?

Family

? State-of-the-Art Advanced BiCMOS

Technology (ABT) Design for 3.3-V

Operation and Low Static-Power

Dissipation

? Support Mixed-Mode Signal Operation

(5-V Input and Output Voltages With

3.3-V VCC)

? Support Unregulated Battery Operation

Down to 2.7 V

? Typical VOLP (Output Ground Bounce)

<0.8 V at VCC = 3.3 V, TA = 25°C

? I off and Power-Up 3-State Support Hot

Insertion

? Bus Hold on Data Inputs Eliminates the Need

for External Pullup/Pulldown Resistors

? Latch-Up Performance Exceeds 500 mA

Per JESD 17

? ESD Protection Exceeds JESD 22

– 2000-V Human-Body Model (A114-A)

– 200-V Machine Model (A115-A)

DESCRIPTION

The 'LVTH16244A devices are 16-bit buffers and line

drivers designed for low-voltage (3.3-V) VCC

operation, but with the capability to provide a TTL

interface to a 5-V system environment. These devices

can be used as four 4-bit buffers, two 8-bit buffers, or

one 16-bit buffer. These devices provide true outputs

and symmetrical active-low output-enable (OE)

inputs.

Active bus-hold circuitry holds unused or undriven

inputs at a valid logic state. Use of pullup or pulldown

resistors with the bus-hold circuitry is not

recommended.

When VCC is between 0 and 1.5 V, the devices are in

the high-impedance state during power up or power

down. However, to ensure the high-impedance state

above 1.5 V, 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.

These devices are 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 devices when they are 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.