SN74LVTH16245A

具有三态输出的 3.3V ABT 16 位总线收发器

* Members of the Texas Instruments Widebus™ Family

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State-of-the-Art Advanced BiCMOS Technology ABT Design for 3.3-V Operation and Low Static-Power Dissipation

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Support Mixed-Mode Signal Operation 5-V Input and Output Voltages With 3.3-V VCC

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Support Unregulated Battery Operation Down to 2.7 V

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

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Distributed VCC and GND Pins Minimize High-Speed Switching Noise

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Flow-Through Architecture Optimizes PCB Layout

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Ioff and Power-Up 3-State Support Hot Insertion

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Bus Hold on Data Inputs Eliminates the Need for External Pullup/Pulldown Resistors

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Latch-Up Performance Exceeds 500 mA Per JESD 17

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ESD Protection Exceeds JESD 22

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2000-V Human-Body Model A114-A

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200-V Machine Model A115-A

Widebus is a trademark of Texas Instruments.

## DESCRIPON/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.