Texas Instruments SN74GTLPH16927KR

Overview

SN74GTLPH16927KR from Texas Instruments is an 18-bit LVTTL-to-GTLP bidirectional bus transceiver with source-synchronous clock outputs, medium-drive GTLP outputs (50 mA), 5-V-tolerant LVTTL I/O, and integrated FSTA skew-adjustment for minimized clock–data skew in high-speed backplane systems. It supports live insertion via Ioff, power-up 3-state, and BIAS VCC.

For engineers reviewing the SN74GTLPH16927KR datasheet, SN74GTLPH16927KR pinout, SN74GTLPH16927KR application, or SN74GTLPH16927KR equivalent, key selection considerations include GTLP/LVTTL level translation capability, 175-MHz clock frequency support, distributed-load backplane timing performance, flexible CMS/FSTA control for source-synchronous mode, and VFBGA GQL package compatibility with high-density PCB layouts.

Technical Context

The SN74GTLPH16927KR implements dual-path D-type latches and flip-flops enabling transparent or latched data transfer in both A-to-B (LVTTL→GTLP) and B-to-A (GTLP→LVTTL) directions. Its TI-OPC™ circuitry actively suppresses overshoot on unevenly loaded backplanes, while OEC™ improves signal integrity and reduces EMI.

It features a dedicated SYSCLK input, buffered SSCLK (GTLP) and CLKOUT (LVTTL) clock outputs, and configurable CMS/CKOE/DIR/OE logic to select between system-synchronous, clock-synchronous, and source-synchronous modes. The FSTA input provides programmable setup-time adjustment to align clock and data edges across 18 channels.

Key Specifications

Pinout & Package

VFBGA-56 package (GQL), 7.0 mm × 4.5 mm body, 0.5-mm ball pitch, RoHS-compliant SnAgCu finish, MSL Level-1-240°C-UNLIM.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74GTLPH16927VR and SN74GTLPH16927GR, the SN74GTLPH16927KR offers the smallest footprint and lowest thermal impedance (θJA = 42°C/W), making it optimal for thermally constrained, high-density backplane interface designs - though its NRND status requires lifecycle planning for new designs.

Availability

SN74GTLPH16927KR is available at Aetrix Electronics and suitable for telecom backplane interfaces, high-speed computing interconnects, and modular test equipment requiring stable component supply and long-term obsolescence management.

Supply support for SN74GTLPH16927KR 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 innovation in high-speed interface ICs and signal integrity technologies.

The SN74GTLPH16927KR belongs to TI's Widebus™ family of high-performance bus transceivers, designed specifically for GTLP-based backplane systems requiring source-synchronous timing, live insertion, and robust noise immunity in telecom and computing infrastructure.

FAQ

What is the primary function of the SN74GTLPH16927KR?

The SN74GTLPH16927KR is an 18-bit bidirectional LVTTL-to-GTLP bus transceiver with integrated source-synchronous clock generation. It translates signals between 3.3-V LVTTL logic and 1.5-V GTLP backplane levels, provides SYSCLK-to-SSCLK/CLKOUT buffering, and supports transparent or latched data transfer using DIR, OE, CKOE, and CMS controls. Its core purpose is enabling high-speed, skew-controlled communication in modular backplane systems.

Does the SN74GTLPH16927KR support live insertion, and how?

Yes, the SN74GTLPH16927KR supports live insertion through three integrated features: Ioff circuitry disables outputs when VCC = 0 V to prevent damaging current backflow; power-up 3-state places outputs in high-impedance during power ramp-up/down; and BIAS VCC precharges B-port I/O before VCC application to avoid disturbing active backplane signals. These functions collectively ensure safe hot-plug operation without system interruption.

What does the FSTA pin do on the SN74GTLPH16927KR?

The FSTA (Flexible Setup-Time Adjustment) pin on the SN74GTLPH16927KR selects between two internal delay paths for the SSCLK output relative to data outputs. When asserted, it introduces a predetermined delay to minimize clock–data skew in source-synchronous applications - critical for achieving timing closure at 175 MHz. This hardware-level skew tuning eliminates reliance on PCB trace length matching alone.

What are the key differences between the SN74GTLPH16927KR and SN74GTLPH16927VR?

The SN74GTLPH16927KR and SN74GTLPH16927VR share identical electrical specifications, logic functionality, and timing behavior. Their sole difference is packaging: SN74GTLPH16927KR uses a 7.0 mm × 4.5 mm VFBGA-56 (GQL) package with 0.5-mm pitch, while SN74GTLPH16927VR uses a 12.5 mm × 6.1 mm TVSOP-56 (DGV) package. The GQL variant offers superior density and thermal performance (θJA = 42°C/W vs. 48°C/W), but requires BGA assembly capability.

Is the SN74GTLPH16927KR still recommended for new designs?

No - the SN74GTLPH16927KR is marked NRND (Not Recommended for New Designs) per TI's packaging addendum. While still in production to support existing customers, TI recommends evaluating newer alternatives such as the SN74GTLPH16927ZQLR (RoHS-compliant ZQL BGA) or migrating to updated GTLP or LVDS interface families for future designs requiring long-term supply assurance and extended lifecycle support.