TXB0101DBVT datasheet(16/31 Pages) TI1

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GND

VCCB

LEGEND

VIA to Power Plane

VIA to GND Plane (Inner Layer)

Polygonal Copper Pour

VCCA

Keep OE low until VCCA and VCCB

are powered up

Bypass Capacitor

TXB0101

To/From

Controller/System

To/From

Controller/System

TXB0101

SCES639C – JANUARY 2007 – REVISED JUNE 2015

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10 Power Supply Recommendations

During operation, ensure that VCCA ≤ VCCB at all times. During power up sequencing, VCCA ≥ VCCB does not

damage the device, so any power supply can be ramped up first. The TXB0101 has circuitry that disables all

output ports when either VCC is switched off (VCCA/B = 0 V). The output-enable (OE) input circuit is designed so

that it is supplied by VCCA and when the (OE) input is low, all outputs are placed in the high-impedance state. To

ensure the high-impedance state of the outputs during power up or power down, the OE input pin must be tied to

GND through a pulldown resistor and must not be enabled until VCCA and VCCB are fully ramped and stable. The

minimum value of the pulldown resistor to ground is determined by the current-sourcing capability of the driver

11 Layout

11.1 Layout Guidelines

To ensure reliability of the device, following common printed-circuit board layout guidelines is recommended.

•

Bypass capacitors should be used on power supplies. And should be placed as close as possible to the VCCA,

VCCB pin and GND pin.

•

Short trace lengths should be used to avoid excessive loading.

•

PCB signal trace-lengths must be kept short enough so that the round-trip delay of any reflection is less than

the one shot duration, approximately 10 ns, ensuring that any reflection encounters low impedance at the

source driver.

11.2 Layout Example

Figure 9. Layout Example Recommendation

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