Texas Instruments SN74GTLP1395DGVR

Overview

SN74GTLP1395DGVR from Texas Instruments is a dual 1-bit LVTTL-to-GTLP bidirectional bus transceiver with split LVTTL port, adjustable edge-rate control (ERC), selectable polarity, and feedback path for diagnostics. It provides high-drive GTLP outputs (100 mA), 5-V-tolerant LVTTL I/O, and supports live insertion via Ioff, power-up 3-state, and BIAS VCC. Designed for IEEE 1394 backplane physical-layer interfaces in distributed-load backplanes.

For engineers reviewing the SN74GTLP1395DGVR datasheet, SN74GTLP1395DGVR pinout, SN74GTLP1395DGVR application, or SN74GTLP1395DGVR equivalent, this device is selected for high-speed backplane clock/data translation between LVTTL logic and GTLP signaling-particularly in hot-pluggable 1394-compliant systems requiring incident-wave switching, signal integrity optimization, and real-time diagnostics feedback.

Technical Context

The SN74GTLP1395DGVR implements two independent 1-bit transceivers, each with separate A (LVTTL input), B (GTLP bidirectional), and Y (LVTTL output) ports, enabling true transparent or inverted data flow controlled by T/C and OEAB/OEBY signals. Its TI-OPC™ circuitry actively suppresses overshoot on unevenly loaded backplanes, while OEC™ improves noise margin and reduces EMI.

Edge-rate control is implemented via the ERC pin, selecting fast (ERC = L) or slow (ERC = H) B-port rise/fall times (1.0–2.6 ns typical). The device operates at 3.3 V VCC with GTLP-compatible VTT = 1.5 V and VREF = 1.0 V, and supports both GTL (VTT = 1.2 V) and GTLP signaling standards.

Key Specifications

Pinout & Package

SN74GTLP1395DGVR is packaged in a 20-pin TVSOP (Thin Very Small Outline Package) with 0.5 mm pitch, measuring 4.4 mm × 6.5 mm, optimized for high-density backplane card layouts.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar LVTTL-to-GTLP bidirectional translation applications.

Compared with SN74GTLP1394DGVR and SN74GTLP1396DGVR, the SN74GTLP1395DGVR uniquely delivers dual independent transceivers with full split-port feedback and externally configurable VREF-making it the only choice for 1394 PHY data+strobe translation where real-time diagnostics and signal-level flexibility are required.

Availability

SN74GTLP1395DGVR is available at Aetrix Electronics and suitable for IEEE 1394 backplane interfaces, high-speed clock distribution networks, and hot-swappable diagnostic buses requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for SN74GTLP1395DGVR 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 decades of expertise in high-speed interface solutions and backplane signal integrity.

The SN74GTLP1395DGVR belongs to TI's GTLP family of backplane transceivers, engineered specifically for IEEE 1394-compliant systems requiring robust live-insertion capability, distributed-load performance, and deterministic timing in telecom, server, and industrial modular architectures.

FAQ

What is the primary function of the SN74GTLP1395DGVR in a backplane system?

The SN74GTLP1395DGVR serves as a dual 1-bit bidirectional level translator between LVTTL logic (host side) and GTLP signaling (backplane side), enabling high-speed data and clock transmission across modular backplanes. It supports IEEE 1394 PHY interfaces, provides split-port feedback for diagnostics, and features adjustable edge-rate control to optimize signal integrity under varying load conditions. The SN74GTLP1395DGVR is specifically designed for live-insertion environments with its Ioff, power-up 3-state, and BIAS VCC circuitry.

How does the ERC pin affect timing performance of the SN74GTLP1395DGVR?

The ERC (Edge-Rate Control) pin selects between fast and slow edge rates for the B-port GTLP outputs: ERC = L yields faster edges (tr = 1.0 ns, tf = 2.0 ns typical), while ERC = H yields slower edges (tr = 1.5 ns, tf = 2.6 ns typical). This directly impacts propagation delay (e.g., A→B tPHL drops from 4.2 ns to 3.4 ns in distributed load) and signal integrity-slower edges reduce EMI and ringing on unterminated traces, while faster edges maximize data rate in well-terminated systems. The SN74GTLP1395DGVR allows system-level tuning without hardware changes.

Can the SN74GTLP1395DGVR operate with both GTL and GTLP signaling standards?

Yes, the SN74GTLP1395DGVR supports both GTL (VTT = 1.2 V, VREF = 0.8 V) and GTLP (VTT = 1.5 V, VREF = 1.0 V) signaling standards. Its input thresholds and output swing are compatible with either configuration, though AC specifications are guaranteed only at GTLP levels. The device's VREF pin must be set accordingly, and the SN74GTLP1395DGVR maintains full functionality-including live insertion and edge-rate control-in both modes. Designers may select based on existing backplane termination architecture.

What role does the split LVTTL port play in system diagnostics?

The split LVTTL port-comprising separate A (input), Y (output), and B (GTLP I/O) terminals-creates an independent feedback path: data driven onto the B-port can be monitored at the Y output without interfering with the primary data flow. This enables real-time validation of polarity selection, output-enable status, and signal integrity at the LVTTL domain. In systems using the SN74GTLP1395DGVR for 1394 PHY interfaces, this allows host processors to verify strobe/data alignment and detect link-layer faults without halting traffic.

Does the SN74GTLP1395DGVR require external termination resistors on the GTLP bus?

Yes, the SN74GTLP1395DGVR requires external termination-typically 50 Ω to VTT (1.5 V for GTLP)-on the GTLP B-port lines to match backplane characteristic impedance and prevent reflections. The device itself does not integrate termination; its high-drive capability (100 mA) is intended to drive incident waves into properly terminated lines. TI-OPC™ circuitry mitigates overshoot if termination is imperfect, but optimal signal integrity and timing margins depend on correct external termination. The SN74GTLP1395DGVR datasheet specifies recommended RTT values based on backplane impedance.