SN74LVC2T45

DUALBIT DUALSUPPLY BUS TRANSCEIVER

WITH CONFIGURABLE VOLTAGE TRANSLATION AND 3STATE OUTPUTS

SCES516E − DECEMBER 2003 − REVISED MAY 2004

15

POST OFFICE BOX 655303

APPLICATION INFORMATION

The following circuit is an example of the SN74LVC2T45 being used in a unidirectional logic level-shifting application.

VCC1

VCC1

VCC2

SYSTEM-1

SYSTEM-2

VCC1

1

2

3

4

8

7

6

5

VCC2

VCC2

PIN

NAME

FUNCTION

DESCRIPTION

1

VCCA

VCC1

SYSTEM-1 supply voltage (1.65 V to 5.5 V)

2

A1

OUT1

Output level depends on VCC1 voltage.

3

A2

OUT2

Output level depends on VCC1 voltage.

4

GND

GND

Device GND

5

DIR

DIR

The GND (low-level) determines B port to A port direction.

6

B2

IN2

Input threshold value depends on VCC2 voltage.

7

B1

IN1

Input threshold value depends on VCC2 voltage.

8

VCCB

VCC2

SYSTEM-2 supply voltage (1.65 V to 5.5 V)

Figure 3. Unidirectional Logic Level-Shifting Application