Texas Instruments 74GTLPH1627DGGRE4

Overview

74GTLPH1627DGGRE4 from Texas Instruments is an 18-bit bidirectional LVTTL-to-GTLP bus transceiver with source-synchronous clock outputs (SSCLK, CLKOUT), supporting 175 MHz system clock frequency, 100 mA GTLP output drive, and FSTA-adjustable clock-data skew control for high-speed backplane interfaces in telecom and computing systems.

For engineers reviewing the 74GTLPH1627DGGRE4 datasheet, 74GTLPH1627DGGRE4 pinout, 74GTLPH1627DGGRE4 application, or 74GTLPH1627DGGRE4 equivalent, this page delivers verified technical context, exact pin functions, live-insertion support details, GTLP/LVTTL level translation specs, and validated alternative parts for backplane timing-critical designs.

Technical Context

The device implements dual-path signal conversion: A-port (LVTTL, 5-V tolerant) interfaces with control logic and SYSCLK, while B-port (GTLP, VTT = 1.5 V, VREF = 1 V) drives heavily loaded backplanes. It supports transparent/latched modes via DIR, OE, and CKOE, with CMS selecting between system- and source-synchronous operation.

TI-OPC and OEC circuitry actively suppress ringing and EMI on unevenly terminated backplanes; ERC input adjusts B-port edge rates (fast/slow) to optimize data integrity vs. speed; BIAS VCC enables true live insertion by precharging GTLP I/O before VCC ramp-up.

Key Specifications

Pinout & Package

TSSOP-64 package (DGG), 12.6 mm × 17.1 mm × 1.2 mm, 0.5 mm pitch, JEDEC MO-153 compliant, with distributed VCC/GND pins to minimize switching noise.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74GTLPH1621DGGR and SN74GTLPH1696DGGR, the 74GTLPH1627DGGRE4 uniquely delivers FSTA-adjustable SSCLK-to-data skew and TI-OPC active ringing suppression-critical for deterministic timing in high-density, high-speed backplane systems requiring live insertion.

Availability

74GTLPH1627DGGRE4 is available at Aetrix Electronics and suitable for telecom backplane interfaces, high-speed computing interconnects, and industrial control chassis requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for 74GTLPH1627DGGRE4 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 technology.

The Widebus™ family-including the 74GTLPH1627DGGRE4-is designed specifically for high-reliability, high-bandwidth backplane communication in telecom, computing, and industrial systems demanding GTLP-level performance and live-insertion capability.

FAQ

What is the primary function of the 74GTLPH1627DGGRE4?

The 74GTLPH1627DGGRE4 is an 18-bit bidirectional LVTTL-to-GTLP bus transceiver that translates signal levels between 3.3-V LVTTL logic and 1.5-V GTLP backplane standards. It provides source-synchronous clock outputs (SSCLK and CLKOUT), supports live insertion via BIAS VCC and Ioff, and enables high-speed data transfer up to 175 MHz. Its core role is bridging processor/memory subsystems with GTLP-terminated backplanes while maintaining precise timing alignment.

How does the FSTA pin affect timing in the 74GTLPH1627DGGRE4?

The FSTA pin on the 74GTLPH1627DGGRE4 configures the delay between SYSCLK and SSCLK output to minimize clock-data skew in source-synchronous applications. When FSTA = GND, the device uses fast alignment (≤2.3 ns SYSCLK→SSCLK delay); when FSTA = VCC, it applies slower alignment (≤2.8 ns). This allows designers to tune setup/hold margins for specific backplane trace lengths and loading conditions-critical for achieving reliable 175 MHz operation.

Can the 74GTLPH1627DGGRE4 operate with GTL (1.2 V) instead of GTLP (1.5 V) signaling?

Yes, the 74GTLPH1627DGGRE4 supports both GTL (VTT = 1.2 V, VREF = 0.8 V) and GTLP (VTT = 1.5 V, VREF = 1.0 V) signaling standards. The device's electrical specifications are fully characterized for GTLP, but its architecture permits flexible use in GTL environments. However, users must verify noise margin, termination, and timing compliance separately for GTL operation, as ac parameters like tpd and skew are specified only at GTLP conditions.

What is the purpose of the BIAS VCC pin on the 74GTLPH1627DGGRE4?

The BIAS VCC pin on the 74GTLPH1627DGGRE4 supplies a dedicated 3.3-V precharge voltage to the GTLP I/O circuitry, enabling true live insertion. It activates before main VCC ramps up, conditioning B-port inputs/outputs to prevent disturbance of active signals on the backplane during card insertion or removal. This feature-combined with Ioff and power-up 3-state-ensures zero current backflow and eliminates bus conflicts in hot-swap systems.

Does the 74GTLPH1627DGGRE4 support adjustable output edge rates?

Yes, the 74GTLPH1627DGGRE4 supports adjustable edge rates on its GTLP outputs (B-port and SSCLK) via the ERC pin. Setting ERC = L selects fast edges (tr ≈ 0.9 ns, tf ≈ 2.3 ns), maximizing data rate; ERC = H selects slow edges (tr ≈ 1.3 ns, tf ≈ 2.7 ns), improving signal integrity and reducing EMI on long or poorly terminated backplanes. This real-time configurability allows optimization for specific board-level constraints without hardware changes.