A1

A2

VCCA

B1

B2

DIR

VCCB

GND

VIA to GND Plane

B2

B1

A1

A2

C2

C1

D2

D1

SN74AVCH2T45

SCES582H – JULY 2004 – REVISED APRIL 2015

www.ti.com

11 Power Supply Recommendations

A proper power-up sequence always should be followed to avoid excessive supply current, bus contention,

oscillations, or other anomalies. To guard against such power-up problems, take the following precautions:

1. Connect ground before any supply voltage is applied.

UNIT

0 V

1.2 V

1.5 V

1.8 V

2.5 V

3.3 V

0 V

0

< 0.5

< 0.5

< 0.5

< 0.5

< 0.5

1.2 V

< 0.5

< 1

< 1

< 1

< 1

1

1.5 V

< 0.5

< 1

< 1

< 1

< 1

1

μA

1.8 V

< 0.5

< 1

< 1

< 1

< 1

< 1

2.5 V

< 0.5

1

< 1

< 1

< 1

< 1

3.3 V

< 0.5

1

< 1

< 1

< 1

< 1

12 Layout

12.1 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. Place the capacitors as close as possible to the VCCA,

VCCB pin and GND pin.

•

Short trace lengths should be used to avoid excessive loading.

12.2 Layout Example

Figure 11. Layout Example for YZP Package

20

Submit Documentation Feedback

Copyright © 2004–2015, Texas Instruments Incorporated

Product Folder Links: SN74AVCH2T45