FEATURES

· 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

· Distributed VCC and GND Pins Minimize

High-Speed Switching Noise

· Flow-Through Architecture Optimizes PCB

Layout

· Ioff 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/ORDERING INFORMATION

The 'LVTH16245A devices are 16-bit (dual-octal) noninverting 3-state transceivers designed for low-voltage

(3.3-V) VCC operation, but with the capability to provide a TTL interface to a 5-V system environment.

The devices are designed for asynchronous communication between two data buses. The logic levels of the

direction-control (DIR) input and the output-enable (OE) input activate either the B-port outputs or the A-port

outputs or place both output ports into the high-impedance mode. The device transmits data from the A bus to

the B bus when the B-port outputs are activated, and from the B bus to the A bus when the A-port outputs are

activated. The input circuitry on both A and B ports is always active and must have a logic HIGH or LOW level

applied to prevent excess ICC and ICCZ.

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.