SN74LVTH16245ADGGR Programmable Logic ICS Bus Transceivers Tri-State ABT 16-Bit

FEATURES

• Members of the Texas Instruments WidebusTM 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 atVCC =3.3V,TA =25°C High-Speed Switching Noise

1B7 • Flow-Through Architecture Optimizes PCB 1B8

• 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 – 200-V Machine Model (A115-A)

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.