SN74LVC2T45 datasheet(13/32 Pages) TI1

13 / 32 page

DIR

VCCA

VCCB

SN74LVC2T45

www.ti.com

SCES516K – DECEMBER 2003 – REVISED JUNE 2017

Product Folder Links: SN74LVC2T45

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8 Detailed Description

8.1 Overview

The SN74LVC2T45 is dual-bit, dual-supply noninverting voltage level translation. Pin Ax and direction control pin

are support by VCCA and pin Bx are support by VCCB. The A port is able to accept I/O voltages ranging from 1.65

V to 5.5 V, while the B port can accept I/O voltages from 1.65 V to 5.5 V. The high on DIR allows data

transmission from A to B and a low on DIR allows data transmission from B to A.

8.2 Functional Block Diagram

Figure 18. Logic Diagram (Positive Logic)

8.3 Feature Description

8.3.1 Fully Configurable Dual-Rail Design Allows Each Port to Operate Over the Full 1.65-V to 5.5-V

Power-Supply Range

Both VCCA and VCCB can be supplied at any voltage between 1.65 V and 5.5 V making the device suitable for

translating between any of the voltage nodes (1.8-V, 2.5-V, 3.3-V and 5-V).

8.3.2 Support High-Speed Translation

SN74LVC2T45 can support high data rate application. The translated signal data rate can be up to 420 Mbps

when signal is translated from 3.3 V to 5 V.

8.3.3 Ioff Supports Partial-Power-Down Mode Operation

Ioff will prevent backflow current by disabling I/O output circuits when device is in partial-power-down mode.

8.4 Device Functional Modes

Table 1 lists the functional modes of the SN74LVC2T45 device.

(1)

Input circuits of the data I/Os always are active.

Table 1. Function Table(1) (Each Transceiver)

INPUT

DIR

OPERATION

B data to A bus

A data to B bus

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