Texas Instruments SN74GTLPH306PWR

Overview

SN74GTLPH306PWR from Texas Instruments is an 8-bit bidirectional LVTTL-to-GTLP bus transceiver in TSSOP-24 package, supporting 3.3-V supply, GTLP signal levels (VTT = 1.5 V, VREF = 1 V), and hot-insertion via Ioff and power-up 3-state. It enables high-speed backplane communication between LVTTL logic cards and GTLP-terminated infrastructure, with 50 mA B-port drive and bus-hold on A-port inputs.

For engineers reviewing the SN74GTLPH306PWR datasheet, SN74GTLPH306PWR pinout, SN74GTLPH306PWR application, or SN74GTLPH306PWR equivalent, key selection considerations include GTLP/LVTTL level translation capability, medium-drive output for distributed backplane loads down to 19 Ω, TI-OPC™ overshoot control, OEC™ signal integrity enhancement, and compatibility with 5-V-tolerant LVTTL control interfaces.

Technical Context

The SN74GTLPH306PWR implements asynchronous bidirectional data flow controlled by DIR and OE pins: low OE enables transmission, while DIR selects direction (A→B when high, B→A when low). Its dual-voltage interface isolates A-port (LVTTL/5-V tolerant) and B-port (GTLP differential) domains, with VREF setting the B-port input threshold.

TI-OPC™ circuitry actively suppresses overshoot during low-to-high transitions on unevenly loaded backplanes, while OEC™ design minimizes bus settling time. The device supports incident-wave switching in distributed RLC backplane models and features active bus-hold on all A-port inputs to maintain valid logic states without external resistors.

Key Specifications

Pinout & Package

TSSOP-24 package (PW), 7.9 mm × 4.5 mm × 1.2 mm max height, lead pitch 0.65 mm, RoHS-compliant NIPDAU finish, MSL Level-1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74GTLPH306DWR and SN74GTLPH306DGVR, the SN74GTLPH306PWR offers optimal balance of compactness (7.9 mm × 4.5 mm), manufacturability (standard TSSOP reflow profile), and thermal performance for mid-density backplane interface designs.

Availability

SN74GTLPH306PWR is available at Aetrix Electronics and suitable for backplane interconnect, hot-swappable module interface, legacy system upgrade path, and multi-voltage board integration requiring stable component supply and long-term production continuity.

Supply support for SN74GTLPH306PWR 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 digital signal technologies, with over 90 years of innovation in high-reliability electronic components.

The SN74GTLPH306PWR belongs to TI's GTLP family of high-speed bus transceivers, engineered specifically for robust, low-noise communication in telecom, industrial, and computing backplane systems operating under JEDEC JESD8-3 compliance.

FAQ

What voltage levels does the SN74GTLPH306PWR support on its A and B ports?

The SN74GTLPH306PWR supports LVTTL logic levels (0 V to VCC) on its A port and control inputs, with 5-V tolerance up to 5.5 V. The B port operates at GTLP signal levels: VTT = 1.5 V (nominal) and VREF = 1 V (nominal), per JEDEC JESD8-3. This dual-voltage architecture enables direct interfacing between 3.3-V LVTTL systems and GTLP-terminated backplanes without external level-shifting circuitry.

How does the TI-OPC™ circuitry in the SN74GTLPH306PWR improve backplane signal integrity?

The TI-OPC™ circuitry in the SN74GTLPH306PWR actively limits overshoot during low-to-high signal transitions on unevenly loaded backplanes-such as those with empty slots or mismatched terminations. By dynamically controlling output slew rate, it maintains adequate noise margin at high frequencies and reduces ringing-induced timing jitter, directly improving data eye opening and bit-error-rate performance in real-world distributed-load environments.

Can the SN74GTLPH306PWR be used in hot-insertion applications, and what features enable this?

Yes, the SN74GTLPH306PWR is fully specified for hot-insertion applications. Its Ioff circuitry disables outputs when VCC = 0 V, preventing damaging current backflow from live backplane traces. Simultaneously, power-up 3-state ensures outputs remain in high-impedance during power ramp-up and ramp-down, eliminating bus contention. These features are validated per JESD78 Class II latch-up and JESD22 ESD standards, making SN74GTLPH306PWR suitable for live-card replacement in telecom and industrial chassis.

What is the purpose of the VREF pin on the SN74GTLPH306PWR, and how should it be configured?

The VREF pin on the SN74GTLPH306PWR sets the differential input threshold voltage for the B-port GTLP receivers. It must be externally biased to 1 V (for GTLP mode) or 0.8 V (for GTL mode), typically using a precision voltage divider from VTT. TI recommends maintaining VREF within 0.6 V of VTT to minimize current drain and ensure optimal noise margin. Incorrect VREF configuration degrades B-port input sensitivity and increases susceptibility to common-mode noise.

Does the SN74GTLPH306PWR include bus-hold functionality, and on which port is it implemented?

Yes, the SN74GTLPH306PWR includes active bus-hold circuitry on all eight A-port data inputs (A1–A8). This feature maintains a valid logic state on undriven or floating inputs without requiring external pullup or pulldown resistors. Bus-hold current specifications (IBHL = 75 µA sink, IBHH = –75 µA source at VCC = 3.15 V) ensure robust state retention across temperature and voltage variations, simplifying system-level design and reducing BOM count.