Texas Instruments SN74GTL16622DGGR

Overview

SN74GTL16622DGGR from Texas Instruments is an 18-bit registered bus transceiver with dual-directional D-type flip-flop storage, translating between GTL/GTL+ (B port) and LVTTL (A port) logic levels. It features independent 9-bit channel control via CEAB/CEBA, bus-hold on A-port inputs, and operates at 3.3 V supply with −40°C to 85°C temperature range for high-speed backplane and memory interface applications.

For engineers reviewing the SN74GTL16622DGGR datasheet, SN74GTL16622DGGR pinout, SN74GTL16622DGGR application, or SN74GTL16622DGGR equivalent, key selection considerations include GTL+/GTL level translation capability, 200 MHz clock frequency support, independent 9-bit enable control, bus-hold functionality eliminating external resistors, and TSSOP-64 packaging with flow-through pinout for PCB layout optimization.

Technical Context

This device implements two independent 9-bit registered transceiver channels-A-to-B and B-to-A-with separate clock (CLKAB/CLKBA), output-enable (OEAB/OEBA), and clock-enable (CEAB/CEBA) controls. Each channel latches data on the low-to-high clock transition when its respective CE is low, enabling precise timing control in bidirectional data paths.

The B port supports GTL (VTT = 1.2 V, VREF = 0.8 V) and GTL+ (VTT = 1.5 V, VREF = 1.0 V) signaling standards with 50 mA sink capability and 0.5 V/ns slew rate control; the A port and control inputs are LVTTL-compatible (VIH = 2 V, VIL = 0.8 V) with bus-hold circuitry providing ±500 µA dynamic hold current to maintain valid logic states on floating inputs.

Key Specifications

Pinout & Package

SN74GTL16622DGGR uses a 64-pin Plastic Thin-Shrink Small-Outline (TSSOP-DGG) package with 0.5 mm pitch, 12.6 mm × 13.9 mm body, and flow-through pin arrangement optimized for layer routing and signal integrity in dense PCB layouts.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar registered bus transceiver applications.

Compared with SN74GTL16612DGGR and SN74GTL16616DGGR, the SN74GTL16622DGGR provides full 18-bit width, independent 9-bit clock-enable control, and dual GTL/GTL+ support-making it uniquely suited for scalable, future-proof backplane and memory subsystem designs requiring flexible channel management and multi-standard interoperability.

Availability

SN74GTL16622DGGR is available at Aetrix Electronics and suitable for memory interface buffers, backplane transceivers, server memory subsystems, and industrial PLC I/O expansion requiring stable component supply and long-term industrial lifecycle support.

Supply support for SN74GTL16622DGGR 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 logic solutions, with decades of heritage in high-performance interface ICs for computing and communications infrastructure.

The SN74GTL16622DGGR belongs to TI's Widebus™ family of registered transceivers, engineered specifically for high-speed, mixed-voltage board-level interconnects in telecom, enterprise storage, and industrial control systems demanding precise timing and robust signal integrity.

FAQ

What voltage levels does the SN74GTL16622DGGR support on its B port?

The SN74GTL16622DGGR supports both GTL (VTT = 1.2 V, VREF = 0.8 V) and GTL+ (VTT = 1.5 V, VREF = 1.0 V) signaling on its B port. The VREF pin accepts either reference voltage to configure input thresholds and output center points accordingly. This dual-mode capability allows the SN74GTL16622DGGR to interface with legacy GTL and newer GTL+ systems without hardware modification.

Does the SN74GTL16622DGGR require external pull-up or pull-down resistors on the A port?

No, the SN74GTL16622DGGR does not require external pull-up or pull-down resistors on the A port due to integrated bus-hold circuitry. This feature actively maintains valid logic states on unused or floating A-port inputs with ±500 µA dynamic hold current. As a result, the SN74GTL16622DGGR reduces BOM count, saves PCB space, and improves reliability in configurations with partially utilized data widths.

What is the maximum clock frequency supported by the SN74GTL16622DGGR?

The SN74GTL16622DGGR supports a maximum clock frequency of 200 MHz for both A-to-B and B-to-A data paths under recommended operating conditions. This specification is guaranteed across the full industrial temperature range (−40°C to +85°C) and applies to both GTL and GTL+ modes, enabling use in high-bandwidth memory and backplane applications where tight timing margins are critical.

How is channel independence implemented in the SN74GTL16622DGGR?

The SN74GTL16622DGGR implements channel independence through dedicated clock-enable inputs-1CEAB/1CEBA for the first 9-bit segment and 2CEAB/2CEBA for the second. Each pair gates its respective CLKAB/CLKBA signal, allowing selective activation of either 9-bit lane without affecting the other. This architecture makes the SN74GTL16622DGGR suitable for asymmetric data paths and partial bus-width operations common in modular system designs.

What package type is used for the SN74GTL16622DGGR, and why is its pinout advantageous?

The SN74GTL16622DGGR uses a 64-pin TSSOP (DGG) package with 0.5 mm pitch and flow-through pin arrangement. Its pinout places A-port inputs/outputs on one side and B-port inputs/outputs on the opposite side, with control signals distributed centrally. This layout minimizes trace crossovers, simplifies layer stacking, and improves signal integrity-making the SN74GTL16622DGGR especially valuable in high-density backplane and server motherboard designs.