Texas Instruments SN74AVC6T622RGYR

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), three directional control inputs (DIR1, DIR2, DIR(345)), and supports bidirectional data translation across six signal pairs including SYNC, BIT_CLK, RESET, and SDATA lines.

For engineers reviewing the SN74AVC6T622 datasheet, SN74AVC6T622 pinout, SN74AVC6T622 application, or SN74AVC6T622 equivalent, key selection considerations include its AC'97 electrical interface compliance, 95 MHz maximum data rate, channel-to-channel skew ≤0.5 ns, low-power high-impedance state on supply loss, and VQFN-20 (RGY) package with exposed thermal pad.

Technical Context

The SN74AVC6T622 implements three independent directional control paths: DIR1 governs A1↔B1 GPIO, DIR2 controls A2↔B2 (SYNC), and DIR(345) manages the 3-bit group A3/A4/A5 ↔ B3/B4/B5 (BIT_CLK/RESET/SDATA_Out). Each port's input thresholds track its respective supply (VCCA or VCCB), enabling robust level-shifting across mixed-voltage domains without external biasing.

When either VCCA or VCCB drops to 0 V, all I/Os enter high-impedance state-eliminating leakage paths and supporting hot-swap and power-gating scenarios in portable AC'97 systems. The device meets JESD 78 Class II latch-up immunity (>100 mA) and exceeds JESD 22 ESD ratings (7000-V HBM, 200-V MM, 1500-V CDM).

Key Specifications

Pinout & Package

VQFN-20 (RGY) package, 3.5 mm × 4.5 mm, 0.5 mm pitch, 1 mm max height, with exposed thermal pad (pin 21) requiring solder connection to PCB ground plane for thermal and mechanical stability.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74AVC8T245RHLR and TXS0108EPWR, the SN74AVC6T622 delivers AC'97-specific signal grouping, guaranteed 95 MHz timing, and per-signal direction control-making it the only option qualified for production AC'97 audio bridges requiring strict electrical and timing conformance.

Availability

SN74AVC6T622RGYR is available at Aetrix Electronics and suitable for personal computer audio subsystems, embedded modem interfaces, and industrial PC audio modules requiring stable component supply and long-term lifecycle support.

Supply support for SN74AVC6T622RGYR 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 leader specializing in analog, embedded processing, and connectivity technologies with over 50 years of innovation in precision analog and interface solutions.

The SN74AVC6T622 belongs to TI's AVC (Advanced Very-Low-Voltage CMOS) logic family-designed specifically for voltage translation in legacy audio, modem, and communication interfaces where mixed-supply interoperability and AC'97 compliance are mandatory.

FAQ

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

DIR(345) is a single active-HIGH control input that simultaneously enables bidirectional translation for the A3/A4/A5 to B3/B4/B5 signal group-covering AC'97 BIT_CLK, RESET, and SDATA_Out lines. When DIR(345) = HIGH, signals flow A→B; when LOW, B→A. This grouped control simplifies AC'97 link configuration versus per-pin direction registers.

Can SN74AVC6T622RGYR operate with VCCA = 1.8 V and VCCB = 3.3 V?

Yes. The SN74AVC6T622RGYR is explicitly characterized and specified for this exact condition-1.8 V A-port supply (VCCA) and 3.3 V B-port supply (VCCB)-as confirmed in the Recommended Operating Conditions table and Switching Characteristics sections of the SCES706A datasheet.

Is the exposed thermal pad on SN74AVC6T622RGYR required to be connected?

Yes. The exposed thermal pad (pin 21) on the SN74AVC6T622RGYR must be soldered to a PCB ground plane per TI's layout guidelines. This connection is essential for achieving the rated 37°C/W thermal impedance and preventing junction temperature exceedance during sustained 95 MHz operation.

Does SN74AVC6T622RGYR support hot-swap or partial power-down?

Yes. If either VCCA or VCCB falls to 0 V, all I/Os on both ports automatically enter high-impedance state-preventing back-current, bus contention, or latch-up. This behavior is guaranteed across –40°C to 85°C and is a core feature for hot-plug audio modules and battery-backed systems.

What AC'97 signals are mapped to the SN74AVC6T622 pinout?

The SN74AVC6T622 maps six AC'97 signals: A2 (controller SYNC) → B2 (codec SYNC), A6 (controller BIT_CLK) → B6 (codec BIT_CLK_In), A5 (controller RESET) → B5 (codec RESET), A4 (controller SDATA_Out) → B4 (codec SDATA_In), A3 (controller BIT_CLK) → B3 (codec SDATA_Out), and A1 (GPIO) ↔ B1 (optional GPIO).