Texas Instruments SN74AVC6T622PWR

Overview

SN74AVC6T622 from Texas Instruments is a 6-bit dual-supply voltage-level transceiver designed for AC'97 audio codec interfacing between 1.8 V controllers and 3.3 V codec links. It features independent A-port (VCCA) and B-port (VCCB) supplies (1.2–3.6 V), direction-controlled bidirectional data paths (DIR1, DIR2, DIR(345)), and automatic high-impedance output disable when either supply is off. Used in PC audio subsystems and embedded AC'97 implementations.

For engineers reviewing the SN74AVC6T622 datasheet, SN74AVC6T622 pinout, SN74AVC6T622 application, or SN74AVC6T622 equivalent, key selection criteria include dual-voltage tracking (VCCA/VCCB), AC'97-compliant timing and levels, 95 MHz maximum data rate, low-power shutdown behavior, and TSSOP-20 package compatibility with legacy PC motherboard layouts.

Technical Context

The SN74AVC6T622 implements three independent directional control groups: DIR1 governs A1↔B1 GPIO path; DIR2 controls A2↔B2 SYNC path; DIR(345) manages the 3-bit A3/A4/A5 ↔ B3/B4/B5 group (BIT_CLK, RESET, SDATA_Out/In). Each port's input thresholds track its respective supply (VCCA or VCCB), enabling robust level translation across 1.2–3.6 V ranges without external biasing.

It complies fully with AC'97 electrical interface specifications-including timing budgets, slew rates (≤3 ns rise/fall at 1.8 V/3 V), and channel-to-channel skew (≤0.5 ns)-and integrates ESD protection exceeding 7000-V HBM, 200-V MM, and 1500-V CDM per JESD22 standards.

Key Specifications

Pinout & Package

TSSOP-20 package (PW), 6.5 mm × 4.4 mm body, 0.65 mm pitch, exposed thermal pad optional (not electrically required).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar voltage-level transceiver applications.

Compared with SN74AVC8T245PWR and TXS0108EPWR, the SN74AVC6T622 delivers AC'97-specific timing accuracy (≤3.8 ns tpd, ≤0.5 ns skew), three independent direction controls matching AC'97 signal groups, and verified compliance with AC'97 electrical interface specs-making it the only option qualified for production AC'97 audio/modem subsystems.

Availability

SN74AVC6T622 is available at Aetrix Electronics and suitable for PC audio subsystems, embedded AC'97 bridges, and legacy motherboard upgrades requiring stable component supply and long-term industrial availability.

Supply support for SN74AVC6T622 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor company specializing in analog, embedded processing, and digital signal technologies, with leadership in interface, power management, and signal chain solutions.

The SN74AVC6T622 belongs to TI's AVC (Advanced Very-low-voltage CMOS) logic family, engineered specifically for voltage translation in audio, modem, and communications interfaces where AC'97, I²S, or similar multi-voltage serial protocols are deployed.

FAQ

What is the function of DIR(345) on the SN74AVC6T622?

DIR(345) is a single direction-control input that governs the bidirectional data flow for three signal pairs: A3↔B3 (BIT_CLK), A4↔B4 (RESET), and A5↔B5 (SDATA_Out/In). When DIR(345) = HIGH, signals pass from A-port to B-port; when LOW, they pass from B-port to A-port. This grouping matches AC'97's core control/data channel architecture and is explicitly defined in the SN74AVC6T622 datasheet function tables.

Can the SN74AVC6T622 operate with VCCA = 1.8 V and VCCB = 3.3 V simultaneously?

Yes, the SN74AVC6T622 is fully characterized for simultaneous operation at VCCA = 1.8 V and VCCB = 3.3 V. Its dual-supply architecture allows independent voltage tracking: A-port inputs/outputs reference VCCA (1.8 V), while B-port signals reference VCCB (3.3 V). This exact configuration is used in the datasheet's typical switching characteristics and AC'97 interface diagrams.

Is the exposed thermal pad on the SN74AVC6T622PWR package required to be connected?

No - the SN74AVC6T622PWR (TSSOP-20) package does not include an exposed thermal pad. That feature applies only to the RGY (VQFN) and ZXY (UFBGA) variants. The PW package uses standard leadframe construction; thermal management relies on PCB copper area under the body and leads per JEDEC MO-153 guidelines.

Does the SN74AVC6T622 support hot-plug detection in AC'97 systems?

Yes, the SN74AVC6T622 supports hot-plug detection via its A1/B1 GPIO path. When configured with DIR1, this pair provides a bidirectional general-purpose signal path that can be used for presence detection, interrupt signaling, or status exchange between controller and codec - a capability documented in the "REFERENCE DESIGN" section and terminal functions table of the SN74AVC6T622 datasheet.

What is the maximum clock frequency supported by the SN74AVC6T622 for AC'97 BIT_CLK signals?

The SN74AVC6T622 supports a maximum data rate of 95 MHz across all channels, including BIT_CLK (A6↔B6). This is confirmed in the "MAXIMUM FREQUENCY AND OUTPUT SKEW" tables for all VCCA/VCCB combinations (e.g., VCCA = 1.8 V ±0.15 V, VCCB = 3 V ±0.3 V), satisfying AC'97's 12.288 MHz BIT_CLK requirement with substantial margin.