Texas Instruments SN74GTLPH16927VR

Overview

SN74GTLPH16927VR from Texas Instruments is an 18-bit LVTTL-to-GTLP bidirectional bus transceiver with source-synchronous clock outputs, supporting 175 MHz operation, 50 mA GTLP drive, and flexible FSTA skew adjustment. It enables high-speed backplane communication between LVTTL logic cards and GTLP-terminated infrastructure in telecom switching systems.

For engineers reviewing the SN74GTLPH16927VR datasheet, SN74GTLPH16927VR pinout, SN74GTLPH16927VR application, or SN74GTLPH16927VR equivalent, key selection criteria include GTLP/LVTTL level translation capability, live-insertion support via Ioff/BIAS VCC/power-up 3-state, distributed-load timing performance, and precise SYSCLK-to-SSCLK-to-Bn skew control under varying VCC and temperature conditions.

Technical Context

This device integrates dual-path D-type latches and flip-flops to support both transparent and latched data transfer modes across A (LVTTL) and B (GTLP) ports. Its CMS input selects between system-synchronous and clock-synchronous operation, while CKOE governs latched vs. transparent behavior and controls CLKOUT/SSCLK buffering.

The TI-OPC circuitry actively limits overshoot on unevenly loaded backplanes, and OEC design minimizes bus settling time. The FSTA feature provides programmable setup-time adjustment between SYSCLK and data outputs to reduce clock–data skew-critical for source-synchronous timing closure at 175 MHz.

Key Specifications

Pinout & Package

SN74GTLPH16927VR uses a 56-pin TVSOP package (DGV), with distributed VCC/GND pins to suppress high-speed switching noise and dedicated BIAS VCC for live-insertion precharge.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74GTLPH16927VR, SN74GTLPH16923VR offers reduced channel count and no skew-adjust capability-limiting use to non-source-synchronous systems-while SN74GTLPH16927GR delivers identical performance in a physically larger TSSOP package, demanding layout revision but offering equivalent signal integrity and timing.

Availability

SN74GTLPH16927VR is available at Aetrix Electronics and suitable for telecom backplane interconnect, high-availability server chassis, and industrial control backplane applications requiring stable component supply, RoHS-compliant packaging, and guaranteed long-term availability.

Supply support for SN74GTLPH16927VR 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 expertise in high-speed interface ICs and backplane technologies.

The SN74GTLPH16927VR belongs to TI's Widebus™ family of high-speed bus transceivers, engineered specifically for GTLP-based telecom and computing backplanes where signal integrity, live-insertion reliability, and source-synchronous timing precision are mission-critical.

FAQ

What is the maximum operating frequency supported by the SN74GTLPH16927VR?

The SN74GTLPH16927VR is fully characterized for 175 MHz operation under recommended conditions (VCC = 3.3 V, VTT = 1.5 V, VREF = 1 V, TA = –40°C to 85°C). This maximum clock frequency applies to both A→B and B→A data paths and is validated with 30 pF lumped load and distributed RLC backplane models. The SN74GTLPH16927VR achieves this rate using GTLP's low-voltage swing (<1 V) and optimized OEC/TI-OPC output drivers.

How does the FSTA pin affect timing in source-synchronous applications using the SN74GTLPH16927VR?

The FSTA pin on the SN74GTLPH16927VR selects between fast and slow internal delay paths between SYSCLK and data outputs, directly controlling clock–data skew to optimize timing margin in source-synchronous mode. When FSTA = low, tsk(LH) ranges from 3.2–4.5 ns; when FSTA = high, it increases to 6.3–8.9 ns - enabling fine-grained skew tuning without external delay elements. This function is exclusive to the SN74GTLPH16927VR and related members of the SN74GTLPH169xx family.

Does the SN74GTLPH16927VR support live insertion, and what features enable it?

Yes, the SN74GTLPH16927VR fully supports live insertion via three integrated features: Ioff circuitry disables outputs when VCC = 0 to prevent backflow current; power-up 3-state holds outputs high-impedance during power ramp; and BIAS VCC precharges B-port I/O before VCC stabilizes. These functions are tested per JESD78 Class II latch-up and JESD22 ESD standards, and require proper connection sequencing (GND → BIAS VCC → I/O → VCC) for full compliance in hot-plug systems.

What are the voltage requirements for VREF and VTT when operating the SN74GTLPH16927VR in GTLP mode?

In GTLP mode, the SN74GTLPH16927VR requires VTT = 1.5 V ±0.15 V and VREF = 1.0 V ±0.13 V. VREF must be set within 0.6 V of VTT to minimize current drain and ensure TI-OPC circuit activation. These values are specified in the Recommended Operating Conditions table and validated across temperature (–40°C to 85°C) and supply (VCC = 3.15–3.45 V). Deviation beyond these ranges risks degraded noise margin or disabled overshoot control.

Can the SN74GTLPH16927VR interface directly with 5-V TTL logic, and how is this achieved?

Yes, the SN74GTLPH16927VR A-port inputs and control pins (DIR, OE, CMS, CKOE, FSTA) are 5-V tolerant, allowing direct connection to 5-V TTL or CMOS outputs without external level shifters. This is enabled by internal clamp structures and verified across VI = 0–5.5 V with IIK ≤ ±18 mA. However, the B-port and SSCLK remain GTLP-only (VI ≤ 4.6 V), and VCC must stay within 3.15–3.45 V - so 5-V logic interfaces only to the A side of the SN74GTLPH16927VR.