Texas Instruments SN74GTLPH306DWR

Overview

SN74GTLPH306DWR from Texas Instruments is an 8-bit bidirectional LVTTL-to-GTLP bus transceiver in SOIC-24 package, supporting hot insertion via Ioff and power-up 3-state, with 5-V-tolerant A-port inputs, 50 mA GTLP B-port drive, and TI-OPC/OEC circuitry for backplane signal integrity. It enables high-speed communication between LVTTL logic cards and GTLP backplanes in telecom switching systems.

For engineers reviewing the SN74GTLPH306DWR datasheet, SN74GTLPH306DWR pinout, SN74GTLPH306DWR application, or SN74GTLPH306DWR equivalent, key selection considerations include GTLP/LVTTL level translation capability, 24-pin SOIC mechanical compatibility, distributed-load timing performance (tPLH = 3.6 ns into RLC load), bus-hold on A inputs, and VREF-referenced differential B-port interface.

Technical Context

The SN74GTLPH306DWR implements asynchronous bidirectional data flow controlled by DIR and OE pins, with noninverting polarity and independent A→B and B→A paths. Its TI-OPC circuitry actively limits overshoot during low-to-high transitions on unevenly loaded backplanes, while OEC circuitry reduces EMI and improves settling time.

It supports dual-mode operation at GTL (VTT = 1.2 V, VREF = 0.8 V) or GTLP (VTT = 1.5 V, VREF = 1 V) signal levels, with A-port inputs tolerant to 5 V and compatible with TTL/CMOS, and B-port inputs referenced to VREF. The device achieves incident-wave switching down to 19 Ω load impedance using medium-drive GTLP outputs.

Key Specifications

Pinout & Package

SN74GTLPH306DWR uses a 24-pin SOIC (DW) package with 0.65 mm pitch, 7.5 mm × 15.4 mm body, and 1.2 mm max height per JEDEC MO-153. Pin 1 index is located at top-left corner of the package marking side.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74GTLPH306DWR, SN74GTLPH16306DGVR doubles data width but increases board area and power, while SN74GTLPH305DWR sacrifices bidirectionality for lower gate count and cost-neither offers pin compatibility or drop-in replacement capability.

Availability

SN74GTLPH306DWR is available at Aetrix Electronics and suitable for telecom backplane interfacing, industrial control backplanes, and test equipment backplane applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for SN74GTLPH306DWR 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 ICs.

The SN74GTLPH306DWR belongs to TI's GTLP logic family, designed specifically for high-speed, noise-resilient backplane communication in telecom, industrial, and test equipment systems requiring robust level translation and hot-insertion reliability.

FAQ

What is the primary function of the SN74GTLPH306DWR?

The SN74GTLPH306DWR is an 8-bit bidirectional bus transceiver that translates signal levels between LVTTL (3.3 V logic with 5-V tolerance) on the A port and GTLP (1.5 V termination) on the B port. It enables high-speed, low-noise communication across backplanes in telecom and industrial systems, with built-in TI-OPC and OEC circuitry for signal integrity.

Does the SN74GTLPH306DWR support hot insertion?

Yes, the SN74GTLPH306DWR supports hot insertion via two integrated features: Ioff circuitry limits current backflow when VCC = 0 (≤10 µA), and power-up 3-state ensures all outputs remain high-impedance during power ramp-up. These features protect the device and backplane during live card replacement in systems like telecom chassis.

What are the recommended operating conditions for VREF and VTT on the SN74GTLPH306DWR?

For GTLP mode, the SN74GTLPH306DWR requires VTT = 1.35–1.65 V (nominal 1.5 V) and VREF = 0.87–1.1 V (nominal 1 V). VREF must be set within 0.6 V of VTT to minimize current drain, and TI-OPC activates when VTT exceeds VREF by >0.7 V. Operation at GTL levels (VTT = 1.2 V, VREF = 0.8 V) is also supported.

Can the SN74GTLPH306DWR be used with standard TTL logic?

Yes, the A-port inputs and control pins of the SN74GTLPH306DWR are 5-V tolerant and compatible with standard TTL and 5-V CMOS logic families. This allows direct connection to legacy 5-V controllers without external level shifters, while the B port remains strictly GTLP-compliant with VTT = 1.5 V termination.

What is the significance of the bus-hold feature on the A-port inputs of the SN74GTLPH306DWR?

The bus-hold circuitry on the A-port inputs of the SN74GTLPH306DWR actively maintains a valid logic state (high or low) on undriven or floating inputs, eliminating the need for external pullup or pulldown resistors. It sources/sinks ≥75 µA to sustain logic levels, improving system reliability in modular backplane designs with variable slot occupancy.