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Texas Instruments 74GTLPH16945VRE4
- Part No.:
- 74GTLPH16945VRE4
- Manufacturer:
- Texas Instruments
- Category:
- Translators, Level Shifters
- Package:
- Datasheet:
-
74GTLPH16945VRE4.pdf
- Description:
- IC TRANSLATOR BIDIR 48TVSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,920
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Product details
Overview
74GTLPH16945VRE4 from Texas Instruments is a 16-bit LVTTL-to-GTLP bidirectional bus transceiver in a 48-pin TVSOP (DGV) package, partitioned into two independent 8-bit channels. It provides medium-drive GTLP outputs (50 mA), 5-V-tolerant LVTTL inputs/outputs (–24 mA/24 mA), and supports live insertion via Ioff, power-up 3-state, and BIAS VCC. It enables high-speed backplane communication in telecom and computing backplane systems.
For engineers reviewing the 74GTLPH16945VRE4 datasheet, 74GTLPH16945VRE4 pinout, 74GTLPH16945VRE4 application, or 74GTLPH16945VRE4 equivalent, key selection considerations include GTLP/LVTTL level translation capability, distributed-load backplane timing (tPLH/tPHL ≤ 6.3 ns), live-insertion support (BIAS VCC, Ioff), bus-hold on A-port inputs, and TI-OPC/OEC signal integrity features for unevenly loaded backplanes.
Technical Context
The 74GTLPH16945VRE4 implements dual 8-bit asynchronous bidirectional data paths with independent DIR and OE controls per channel. Its TI-OPC circuitry actively limits overshoot during low-to-high transitions on unterminated or unevenly loaded backplanes, while OEC circuitry enhances signal integrity and reduces EMI.
It operates with separate supply domains: VCC (3.15–3.45 V) powers LVTTL logic and control inputs; BIAS VCC (3.15–3.45 V) preconditions B-port I/O for live insertion; VREF (0.87–1.1 V) sets differential input threshold on GTLP side; and VTT (1.35–1.65 V) supplies GTLP termination. The device supports both GTL (VTT = 1.2 V, VREF = 0.8 V) and GTLP (VTT = 1.5 V, VREF = 1 V) standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Supply | 3.15–3.45 V - powers LVTTL logic and ensures compatibility with 3.3-V system rails |
| GTLP Output Drive | 50 mA - enables incident-wave switching on heavily loaded backplanes down to 19 Ω impedance |
| LVTTL I/O Drive | –24 mA / 24 mA - supports TTL and 5-V CMOS interface without level shifters |
| Propagation Delay | ≤6.3 ns (A→B), ≤5.3 ns (B→A) - optimized for high-frequency backplane data transfer |
| Rise/Fall Time (B) | 2.5 ns / 2.1 ns (lumped load); 1 ns / 2 ns (distributed RLC load) - balances speed and signal integrity |
| Live-Insertion Support | Ioff <10 µA at VCC = 0, BIAS VCC = 0 - prevents backflow current during hot-swap |
| Bus-Hold on A Port | IBHL ≥75 µA, IBHH ≥–75 µA - maintains valid logic states on unused LVTTL inputs without external resistors |
Pinout & Package
Package: 48-pin TVSOP (DGV), 0.4 mm pitch, 6.1 mm × 12.5 mm body, JEDEC MO-153 compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1DIR, 2DIR | Direction control input (per 8-bit channel) | Determines data flow direction: high = A→B, low = B→A |
| 1OE, 2OE | Output enable input (per 8-bit channel) | Low enables transceiver; high places outputs in high-impedance state |
| 1A1–1A8, 2A1–2A8 | LVTTL data inputs/outputs (A port) | 5-V tolerant; feature bus-hold; connect to card-side logic |
| 1B1–1B8, 2B1–2B8 | GTLP data inputs/outputs (B port) | Differential inputs referenced to VREF; connect to backplane |
| VREF | B-port reference voltage input | Sets GTLP input threshold; typically 1 V for GTLP operation |
| BIAS VCC | Precharge supply for B-port I/O | Enables live insertion by preconditioning backplane lines before VCC ramp-up |
| GND, VCC | Power distribution pins | Distributed across package to minimize simultaneous switching noise |
Key Features
| Feature | Design Value |
|---|---|
| TI-OPC active overshoot control | Suppresses ringing on unevenly terminated backplanes, enabling reliable >100 MHz operation |
| OEC signal integrity enhancement | Reduces EMI and improves noise margin by optimizing edge rates and output impedance |
| Asymmetric dual-voltage operation | Separate VCC (3.3 V) and VTT/VREF (1.5 V/1 V) domains allow mixed-supply system integration |
| Live-insertion ready architecture | Ioff, power-up 3-state, and BIAS VCC collectively eliminate bus conflicts during hot-swap events |
| Bus-hold on all A-port inputs | Eliminates need for external pullup/pulldown resistors on undriven LVTTL data lines |
Applications
| Telecom Backplane Interface | Server Blade Interconnect |
|---|---|
Use Scenario: High-density line cards exchanging data across a shared GTLP backplane in carrier-grade switches. IC Role / Device Role / Timing Role: Level-translating bus transceiver enabling LVTTL-based ASICs to drive/terminate GTLP backplane signals with sub-6.3 ns propagation delay. Use Value: Supports >100 MHz data rates on distributed 70-Ω backplanes while maintaining noise margin via TI-OPC and OEC circuits. | Use Scenario: Hot-pluggable compute blades communicating with a central midplane in modular server chassis. IC Role / Device Role / Timing Role: Bidirectional interface isolating blade-side LVTTL logic from midplane GTLP signaling, with live-insertion support. Use Value: BIAS VCC and Ioff prevent data corruption or backplane disturbance during card insertion/removal. |
| Industrial Control Backplane | Test Equipment Modular Architecture |
Use Scenario: Real-time I/O modules synchronously exchanging sensor/actuator data over a deterministic GTLP backplane in PLC racks. IC Role / Device Role / Timing Role: Medium-drive transceiver translating between FPGA-based LVTTL control logic and deterministic GTLP backplane timing. Use Value: Distributed GND/VCC pins and 19-Ω minimum load capability ensure stable operation under high-noise industrial EMI conditions. | Use Scenario: Modular PXI or VXI instruments where measurement modules must be swapped without powering down the main chassis. IC Role / Device Role / Timing Role: Isolation and level-shifting element enabling LVTTL instrument controllers to interface with GTLP-switched backplane resources. Use Value: Power-up 3-state and bus-hold guarantee no spurious signals propagate during module reconfiguration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74GTLPH16945GR | TSSOP-48 (DGG) package; identical electrical specs and pinout; same thermal impedance (58°C/W) | No mechanical difference in function; DGG has larger footprint (12.5 × 6.1 mm vs. DGV's 12.5 × 6.1 mm but thinner profile) | Select DGG for standard surface-mount assembly; DGV preferred for space-constrained or low-profile designs. |
| SN74GTLPH16945KR | VFBGA-48 (GQL) package; same logic and timing; lower thermal impedance (42°C/W); different pin mapping | GQL requires PCB redesign; superior thermal performance suits high-density, thermally constrained applications | Choose GQL only when board layout allows BGA placement and thermal management justifies redesign effort. |
Compared with SN74GTLPH16945GR and SN74GTLPH16945KR, the 74GTLPH16945VRE4 offers identical signal integrity and live-insertion functionality in a thinner TVSOP package-ideal for height-sensitive backplane card designs where thermal load is moderate and PCB real estate is constrained.
Availability
74GTLPH16945VRE4 is available at Aetrix Electronics and suitable for telecom backplane interfaces, server blade interconnects, and industrial control systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for 74GTLPH16945VRE4 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 74GTLPH16945VRE4 belongs to TI's Widebus™ family of high-speed bus interface devices, designed specifically for robust, noise-immune communication between LVTTL logic and GTLP backplanes in telecom and computing infrastructure.
FAQ
What is the primary function of the 74GTLPH16945VRE4 in a backplane system?
The 74GTLPH16945VRE4 serves as a bidirectional LVTTL-to-GTLP bus transceiver, enabling seamless data exchange between LVTTL-based cards (e.g., FPGAs or microcontrollers) and a GTLP-signaled backplane. Its dual 8-bit channels, medium-drive outputs (50 mA), and TI-OPC circuitry ensure reliable high-speed communication on distributed loads-making it essential for telecom switches and modular servers. The 74GTLPH16945VRE4 is explicitly rated for GTLP operation with VTT = 1.5 V and VREF = 1 V.
Does the 74GTLPH16945VRE4 support live insertion, and how is it implemented?
Yes, the 74GTLPH16945VRE4 supports live insertion through three integrated features: Ioff circuitry disables outputs when VCC = 0, preventing damaging current backflow; power-up 3-state holds outputs high-impedance during power ramp; and BIAS VCC precharges B-port lines before VCC is applied. These functions are validated in TI's SCES292D datasheet and allow safe hot-swap in modular chassis-critical for telecom and test equipment. The 74GTLPH16945VRE4 implements all three mechanisms natively.
What are the voltage domain requirements for proper operation of the 74GTLPH16945VRE4?
The 74GTLPH16945VRE4 requires three distinct voltage domains: VCC (3.15–3.45 V) for LVTTL logic and control inputs; BIAS VCC (3.15–3.45 V) for B-port precharge; and VTT (1.35–1.65 V) with VREF (0.87–1.1 V) for GTLP signaling. All domains must be within spec simultaneously-VCC and BIAS VCC may share a 3.3-V rail, but VTT/VREF require dedicated low-noise regulation. This multi-rail requirement is documented in the "Recommended Operating Conditions" table of the 74GTLPH16945VRE4 datasheet.
How does the 74GTLPH16945VRE4 handle unused LVTTL inputs?
The 74GTLPH16945VRE4 includes active bus-hold circuitry on all A-port (LVTTL) inputs, which maintains undriven pins at valid logic levels without external resistors. Per the datasheet, IBHL ≥75 µA and IBHH ≥–75 µA ensure stable hold behavior. Using pullup or pulldown resistors with enabled bus-hold is explicitly discouraged, as it may cause contention. This feature applies exclusively to A-port inputs-not B-port or control pins-and is inherent to the 74GTLPH16945VRE4 silicon design.
What is the significance of TI-OPC and OEC circuitry in the 74GTLPH16945VRE4?
TI-OPC (Texas Instruments Optimized Propagation Control) actively limits overshoot during low-to-high transitions on poorly terminated backplanes, while OEC (Off-Chip Driver Enhancement Circuitry) improves signal integrity and reduces EMI by optimizing edge rates and output impedance. Both are patented TI technologies embedded in the 74GTLPH16945VRE4 die-verified in application reports SCBA004 and SCES292D. They enable stable >100 MHz operation on real-world backplanes where impedance discontinuities exist, distinguishing the 74GTLPH16945VRE4 from generic transceivers.
74GTLPH16945VRE4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74GTLPH
- Package/Case:
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Translator Type:
- Mixed Signal
- Channel Type:
- Bidirectional
- Number of Circuits:
- 2
- Channels per Circuit:
- 8
- Voltage - VCCA:
- -
- Voltage - VCCB:
- -
- Input Signal:
- LVTTL
- Output Signal:
- GTLP
- Output Type:
- Tri-State, Non-Inverted
- Data Rate:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Features:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 48-TFSOP (0.173", 4.40mm Width)
74GTLPH16945VRE4 FAQ
1.How can I place an order for 74GTLPH16945VRE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74GTLPH16945VRE4 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for 74GTLPH16945VRE4 reliable?
The price and inventory of 74GTLPH16945VRE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74GTLPH16945VRE4 is usually 5 days.
3.What payment methods are accepted for 74GTLPH16945VRE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74GTLPH16945VRE4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74GTLPH16945VRE4?
74GTLPH16945VRE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74GTLPH16945VRE4 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for 74GTLPH16945VRE4?
For technical support, including 74GTLPH16945VRE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74GTLPH16945VRE4 requirements.
6.How does Aetrix verify that 74GTLPH16945VRE4 is sourced from the original manufacturer or authorized distributors?
All 74GTLPH16945VRE4 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that 74GTLPH16945VRE4 meets industry standards.
7.What is the process for return or replacement of 74GTLPH16945VRE4?
All 74GTLPH16945VRE4 units undergo pre-shipment inspection (PSI). If there is an issue with 74GTLPH16945VRE4, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The 74GTLPH16945VRE4 part is unused and in its original packaging.
Return procedure for 74GTLPH16945VRE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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