SN74AVCH20T245GR

Buffers, Drivers, Receivers, Transceivers Overview

The SN74AVCH20T245GR is a 20-bit noninverting bus transceiver featuring two separate configurable power-supply rails, VCCA and VCCB. It supports bidirectional data transmission between A and B buses with independent voltage levels ranging from 1.2 V to 3.6 V. The device operates within an ambient temperature range of -40°C to +85°C and utilizes a 56-pin TSSOP (DGG) package.

Buffers, Drivers, Receivers, Transceivers Feature Summary

• Dual-rail design allows universal low-voltage bidirectional translation between any voltage nodes from 1.2 V to 3.6 V.
• Overvoltage-tolerant inputs and outputs support mixed-voltage-mode data communications without external level shifters.
• Ioff circuitry enables partial-power-down mode by disabling outputs to prevent damaging current backflow.
• VCC isolation feature ensures high-impedance state on both ports if either supply input is at ground potential.

Buffers, Drivers, Receivers, Transceivers Applications

• Asynchronous communication between data buses operating at different voltage levels
• Partial-power-down applications requiring controlled output disablement
• Mixed-voltage system interfaces eliminating the need for external pullup or pulldown resistors

Buffers, Drivers, Receivers, Transceivers Procurement Notes

Verify the specific ordering suffix 'GR' corresponds to the DGG TSSOP package variant in official documentation. Confirm RoHS compliance status and check for product discontinuance notifications prior to procurement, as availability may be restricted.

Buffers, Drivers, Receivers, Transceivers Selection Notes

Select this component when designing systems requiring 20-bit wide bidirectional translation between distinct voltage domains. Ensure control inputs are supplied by VCCA and verify that the required data rates align with the specific voltage translation pairs defined in the switching characteristics tables.

Buffers, Drivers, Receivers, Transceivers Part Context

This device belongs to the SN74AVCH20T245 family of translating transceivers. It shares functional similarities with other dual-supply logic ICs but is distinguished by its 20-bit width and specific 56-pin TSSOP packaging configuration designed for high-density board layouts.

Buffers, Drivers, Receivers, Transceivers Replacement Considerations

SN74AVCH20T245VR (TVSOP-56 package)

Buffers, Drivers, Receivers, Transceivers FAQ

How does the VCC isolation feature function?

If either VCCA or VCCB input is at GND, both ports automatically enter a high-impedance state to isolate the buses.

What is the purpose of the bus-hold circuitry?

Active bus-hold circuitry holds unused or undriven inputs at a valid logic state, eliminating the need for external pullup or pulldown resistors.