Nexperia

74LVC8T245; 74LVCH8T245

8-bit dual supply translating transceiver; 3-state

12. Application information

12.1. Unidirectional logic level-shifting application

The circuit given in Fig. 15 is an example of the 74LVC8T245; 74LVCH8T245 being used in an

unidirectional logic level-shifting application.

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74LVC8T245

74LVCH8T245

VCC1

system-1

system-2

VCC1

VCC2

VCC2

VCC(A)

VCC(B)

GND

DIR

Bn

OE

An

Schematic given for one channel.

Fig. 15. Unidirectional logic level-shifting application

Table 15. Description unidirectional logic level-shifting application

Name

Function

Description

VCC(A)

VCC1

supply voltage of system-1 (1.2 V to 5.5 V)

GND

GND

device GND

A

OUT

output level depends on VCC1 voltage

B

IN

input threshold value depends on VCC2 voltage

DIR

DIR

the GND (LOW level) determines B port to A port direction

VCC(B)

VCC2

supply voltage of system-2 (1.2 V to 5.5 V)

OE

OE

The GND (LOW level) enables the output ports

12.2. Bidirectional logic level-shifting application

Fig. 16 shows the 74LVC8T245; 74LVCH8T245 being used in a bidirectional logic level-shifting

application.

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PULL-UP/DOWN

PULL-UP/DOWN

74LVC8T245

74LVCH8T245

VCC1

VCC1

VCC2

VCC2

I/O-2

I/O-1

DIR CTRL

system-2

system-1

VCC(A)

VCC(B)

GND

DIR

B

OE

A

OE

Schematic given for one channel.

Pull-up or pull-down only needed for 74LVC8T245.

Fig. 16. Bidirectional logic level-shifting application

74LVC_LVCH8T245

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© Nexperia B.V. 2021. All rights reserved

Product data sheet

Rev. 5 — 29 April 2021

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