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74AVCH2T45DCTRE4 Datasheet(PDF) 14 Page - Texas Instruments

Part No. 74AVCH2T45DCTRE4
Description  2-Supply, Bus Transceiver with Configurable Level-Shifting
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Maker  TI1 [Texas Instruments]
Homepage  http://www.ti.com
Logo TI1 - Texas Instruments

74AVCH2T45DCTRE4 Datasheet(HTML) 14 Page - Texas Instruments

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B1
DIR
5
7
A1
2
VCCA
VCCB
B2
6
A2
3
1
8
VCCA
VCCB
GND
4
VCCA
VCCB
SN74AVCH2T45
SCES582H – JULY 2004 – REVISED APRIL 2015
www.ti.com
9 Detailed Description
9.1 Overview
This dual-bit non-inverting bus transceiver uses two separate configurable power-supply rails. The A port is
designed to track VCCA and accepts any supply voltage from 1.2 V to 3.6 V. The B port is designed to track VCCB
and accepts any supply voltage from 1.2 V to 3.6 V. This allows for universal low-voltage bidirectional translation
and level-shifting between any of the 1.2 V, 1.5 V, 1.8 V, 2.5 V, and 3.3 V voltage nodes.
The SN74AVCH2T45 is designed for asynchronous communication between two data buses. The logic levels of
the direction-control (DIR pin) input activate either the B-port outputs or the A-port outputs. The device transmits
data from the A bus to the B bus when the B-port outputs are activated and from the B bus to the A bus when
the A-port outputs are activated.
The SN74AVCH2T45 features active bus-hold circuitry.
The DIR input is powered by supply voltage from VCCA.
This device is fully specified for partial-power-down applications using off output current (Ioff). The Ioff circuitry
disables the outputs, preventing damaging current backflow through the device when it is powered down.
The VCC isolation feature ensures that if either VCC input is at GND, both ports are put in a high-impedance
state. This will prevent a false high or low logic being presented at the output.
NanoFree package technology is a major breakthrough in IC packaging concepts, using the die as the package.
9.2 Functional Block Diagram
14
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Product Folder Links: SN74AVCH2T45


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