Texas Instruments SN74GTLP1395PWR

Overview

SN74GTLP1395PWR from Texas Instruments is a dual 1-bit LVTTL-to-GTLP adjustable-edge-rate bus transceiver with split LVTTL port, feedback path, and selectable polarity. It provides bidirectional signal-level translation between 3.3-V LVTTL logic (5-V tolerant) and GTLP backplane signals (VTT = 1.5 V, VREF = 1 V), supports live insertion via Ioff, power-up 3-state, and BIAS VCC, and delivers 100 mA GTLP output drive for incident-wave switching on heavily loaded backplanes down to 11 Ω.

For engineers reviewing the SN74GTLP1395PWR datasheet, SN74GTLP1395PWR pinout, SN74GTLP1395PWR application, or SN74GTLP1395PWR equivalent, key selection considerations include GTLP/LVTTL level translation capability, ERC-controlled edge rates (fast/slow), true/complement polarity selection, split-port feedback for diagnostics, and compatibility with IEEE 1394 backplane PHYs such as TSB14AA1 in S50/S100 systems.

Technical Context

The SN74GTLP1395PWR implements two independent 1-bit transceivers, each with separate A (LVTTL input), B (GTLP I/O), and Y (LVTTL output) terminals, enabling transparent or inverted data flow controlled by T/C and OEAB/OEBY inputs. Its TI-OPC™ circuitry actively limits overshoot on unevenly loaded backplanes, while OEC™ improves signal integrity and reduces EMI.

It operates across –40°C to 85°C with VCC = 3.15–3.45 V, supports GTL (VTT = 1.2 V) or GTLP (VTT = 1.5 V) modes, and uses BIAS VCC precharge to prevent backplane disturbance during live card insertion. The ERC input selects fast (ERC = L) or slow (ERC = H) GTLP edge rates, optimizing trade-offs between data-transfer rate and signal integrity under distributed RLC loads.

Key Specifications

Pinout & Package

TSSOP-20 (PW) package: 6.5 mm × 4.4 mm, 0.65 mm pitch, thermally enhanced with exposed pad (not electrically connected). Pin 1 marked by dot; pin numbering follows standard counter-clockwise convention from top-left corner.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74GTLP1394PWR and SN74GTLP1397PWR, the SN74GTLP1395PWR uniquely combines dual independent transceivers, split LVTTL port for diagnostics feedback, and ERC-adjustable edge rates - making it the only option among the three qualified for IEEE 1394 backplane PHY interfacing with full hot-plug support.

Availability

SN74GTLP1395PWR is available at Aetrix Electronics and suitable for IEEE 1394 backplane diagnostics, hot-pluggable VME/FB+ module interfaces, and GTLP-based industrial backplane interconnects requiring stable component supply and long-term lifecycle continuity.

Supply support for SN74GTLP1395PWR 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 over 50 years of innovation in high-speed interface technology.

The SN74GTLP1395PWR belongs to TI's GTLP logic family, designed specifically to enable robust, high-speed, live-insertion-capable communication between LVTTL controllers and GTLP backplanes in IEEE 1394, VME, and CPCI systems.

FAQ

What is the function of the BIAS VCC pin on the SN74GTLP1395PWR?

The BIAS VCC pin (Pin 20) supplies 3.3 V to precharge and precondition the B-port GTLP I/O connections before main VCC ramps up. This prevents disturbance of active data on the backplane during live card insertion or removal. For proper operation, BIAS VCC must be connected before VCC and after GND - a sequence enforced by internal disable logic when VCC is present.

How does the ERC input affect timing performance of the SN74GTLP1395PWR?

The ERC input selects GTLP output edge rates: ERC = L yields fast edges (1.3 ns rise, 2.7 ns fall), maximizing data rate on well-terminated loads; ERC = H yields slow edges (2.4 ns rise, 3.0 ns fall), improving signal integrity on unterminated or distributed backplanes. Propagation delays also shift - e.g., A→B tPLH is 3.8 ns (fast) vs. 4.3 ns (slow) into RLC loads per TI SPICE models.

Can the SN74GTLP1395PWR operate with GTL (1.2-V VTT) instead of GTLP (1.5-V VTT)?

Yes, the SN74GTLP1395PWR supports both GTL (VTT = 1.2 V, VREF = 0.8 V) and GTLP (VTT = 1.5 V, VREF = 1.0 V) signaling standards. Electrical specifications are guaranteed only for GTLP, but functional operation at GTL levels is permitted. VREF must be set to ~0.6 V below VTT to minimize current drain and maintain TI-OPC functionality in A-to-B direction.

What is the purpose of the split LVTTL port (A and Y) in the SN74GTLP1395PWR?

The split LVTTL port separates the A input (host-side data source) from the Y output (host-side data sink), creating a dedicated feedback path. This allows the host controller to monitor backplane responses (e.g., PHY acknowledgments or status signals) without interfering with outbound data flow - critical for diagnostics, error recovery, and real-time control in IEEE 1394 backplane systems.

Does the SN74GTLP1395PWR support true hot-plug operation, and what features enable it?

Yes, the SN74GTLP1395PWR is fully specified for live-insertion applications. It integrates three key features: Ioff circuitry disables outputs when VCC = 0 V to prevent damaging current backflow; power-up 3-state places outputs in high-Z during VCC ramp-up/down to avoid driver conflicts; and BIAS VCC precharges B-port lines before VCC application to suppress transients on active backplanes.