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Texas Instruments SN74GTLPH32945KR
- Part No.:
- SN74GTLPH32945KR
- Manufacturer:
- Texas Instruments
- Category:
- Translators, Level Shifters
- Package:
- Datasheet:
-
SN74GTLPH32945KR.pdf
- Description:
- IC TRANSLATOR BIDIR 96LFBGA
- Quantity:
- Payment:
- Shipping:
Inventory:1,463
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Product details
Overview
SN74GTLPH32945KR from Texas Instruments is a 32-bit LVTTL-to-GTLP bidirectional bus transceiver partitioned into four 8-bit segments, supporting medium-drive (50 mA) GTLP outputs and ±24 mA LVTTL I/O, with 5-V-tolerant A-port inputs and live-insertion capability via Ioff, power-up 3-state, and BIAS VCC. It enables high-speed backplane communication in telecom line cards requiring signal-level translation between LVTTL logic and GTLP signaling.
For engineers reviewing the SN74GTLPH32945KR datasheet, SN74GTLPH32945KR pinout, SN74GTLPH32945KR application, or SN74GTLPH32945KR equivalent, key selection considerations include GTLP/LVTTL level translation integrity, distributed-load backplane timing (tPLH/tPHL ≤ 4.3 ns), TI-OPC active overshoot control, bus-hold on A-port inputs, and live-insertion support under hot-swap conditions.
Technical Context
This device implements asynchronous bidirectional data flow controlled by DIR and OE inputs, with noninverting polarity and true transparent mode operation. Each of the four 8-bit sections features independent DIR/OE controls, dedicated VCC/BIAS VCC pins, and differential B-port reference (VREF) for GTLP input threshold stability.
TI-OPC circuitry actively limits overshoot during low-to-high transitions on unevenly loaded backplanes, while OEC improves signal integrity and reduces EMI. The BIAS VCC precharge function conditions B-port I/O before VCC ramp-up, enabling disturbance-free live insertion into active backplanes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Function | 32-bit bidirectional LVTTL-to-GTLP bus transceiver, partitioned as four independent 8-bit channels |
| GTLP Drive Strength | 50 mA sink per B-port output - supports incident-wave switching into 19 Ω distributed backplane loads |
| LVTTL Drive Strength | –24 mA / +24 mA per A-port output - compatible with standard LVTTL buses and 5-V-tolerant inputs |
| Propagation Delay (A→B) | 4.3 ns typical into RLC distributed load - optimized for high-speed backplane timing closure |
| Live-Insertion Support | Ioff < 10 µA at VCC = 0 V, IOZPU/IOZPD ≤ ±30 µA during power ramp - prevents backflow and bus conflict |
| VREF Range | 0.87 V to 1.1 V for GTLP - sets B-port differential input threshold; adjustable to optimize noise margin |
| Rise/Fall Time (B port) | 1 ns rise / 2 ns fall (20%–80%) into RLC load - minimizes ringing and ensures clean edge integrity |
Pinout & Package
SN74GTLPH32945KR is housed in a 160-pin LFBGA (GKE package), with distributed VCC/GND pins to suppress high-speed switching noise and dedicated BIAS VCC pins per channel group for live-insertion preconditioning.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1A1–1A8, 2A1–2A8, 3A1–3A8, 4A1–4A8 | A-port data inputs/outputs | LVTTL-level bidirectional I/O, 5-V tolerant, with bus-hold on inputs |
| 1B1–1B8, 2B1–2B8, 3B1–3B8, 4B1–4B8 | B-port data inputs/outputs | GTLP-level bidirectional I/O, referenced to VREF, terminated to VTT = 1.5 V |
| 1DIR–4DIR | Direction control per 8-bit section | High = A→B data flow; Low = B→A data flow - enables independent channel directionality |
| 1OE–4OE | Output enable per 8-bit section | Low = enabled; High = high-impedance - allows per-segment isolation without affecting others |
| 1VCC, 2VCC | Core supply for A/B ports | 3.15–3.45 V nominal - powers logic and LVTTL drivers; decoupled per channel group |
| 1BIAS VCC, 2BIAS VCC | Precharge supply for B-port I/O | 3.3 V - activates precharge circuitry before VCC ramp-up to prevent backplane disturbance during card insertion |
| 1VREF, 2VREF | Differential input reference for B port | Set to 1 V for GTLP - defines GTLP input threshold; must be stable and low-noise |
Key Features
| Feature | Design Value |
|---|---|
| TI-OPC active overshoot control | Actively limits low-to-high transition overshoot on unterminated or unevenly loaded backplanes, preserving signal integrity at >100 MHz |
| OEC circuitry | Reduces electromagnetic interference and shortens bus settling time via optimized output stage design |
| Bus-hold on A-port inputs | Eliminates need for external pullup/pulldown resistors on undriven LVTTL inputs - maintains valid logic state passively |
| Distributed VCC/GND pinning | Minimizes simultaneous switching noise (SSN) in high-density backplane applications with >32 signals switching concurrently |
| Live-insertion support | Combines Ioff, power-up 3-state, and BIAS VCC to enable safe hot-plug into powered backplanes without system reset or data corruption |
Applications
| Telecom Line Cards | Backplane Interconnect Modules |
|---|---|
Use Scenario: High-density line cards in carrier-grade switches connect to shared GTLP backplanes while hosting LVTTL-based ASICs and FPGAs. IC Role / Device Role / Timing Role: Level-translating bus transceiver providing bidirectional data path between LVTTL logic and GTLP backplane, with sub-5 ns propagation delay and TI-OPC-controlled edges. Use Value: Enables 32-bit parallel data transfer at >100 MHz without signal degradation across 10-slot backplanes, reducing need for repeaters or retiming. |
Use Scenario: Modular chassis systems require hot-swappable modules that interface to a common GTLP backplane while using legacy LVTTL peripherals. IC Role / Device Role / Timing Role: Live-insertion-capable transceiver isolating module-local LVTTL buses from shared GTLP infrastructure during insertion/removal. Use Value: Eliminates system downtime during field upgrades; BIAS VCC precharges B-port lines before VCC power-up, preventing glitches on active backplane. |
| Industrial Control Backplanes | Test Equipment Backplane Interfaces |
Use Scenario: Programmable logic controllers use modular I/O carriers connected via GTLP backplanes, with local FPGA-based processing operating at LVTTL levels. IC Role / Device Role / Timing Role: Medium-drive transceiver translating between FPGA I/O banks and deterministic GTLP backplane, supporting distributed-load impedance down to 19 Ω. Use Value: Sustains reliable data integrity across long, heavily loaded industrial backplanes where termination is impractical, avoiding signal reflection-induced errors. |
Use Scenario: Automated test equipment uses reconfigurable instrument modules plugged into a GTLP-based mainframe backplane, each hosting LVTTL-based analog/digital front-ends. IC Role / Device Role / Timing Role: Bidirectional level shifter enabling synchronized control/data exchange between LVTTL instruments and GTLP system controller, with per-channel DIR/OE for flexible routing. Use Value: Allows independent enable/disable of each 8-bit segment during test sequencing, minimizing crosstalk and enabling precise timing alignment across multi-module test vectors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74GTLPH32942KR | Same 32-bit LVTTL-to-GTLP architecture but with lower drive strength (24 mA B-port), no TI-OPC, and no BIAS VCC | Lacks live-insertion support and active overshoot control - suitable only for fixed-installation, well-terminated backplanes | Select when cost sensitivity outweighs hot-swap requirement and backplane loading is light and uniform |
| SN74GTL16622DGGR | 16-bit version, same GTLP/LVTTL translation, includes BIAS VCC and TI-OPC, but no bus-hold on A-port inputs | Half the channel count; requires two devices for 32-bit width - increases PCB area and routing complexity | Choose when board space permits dual-device layout and bus-hold is managed externally via FPGA I/O configuration |
Compared with SN74GTLPH32942KR and SN74GTL16622DGGR, the SN74GTLPH32945KR uniquely integrates full live-insertion support (Ioff + BIAS VCC + power-up 3-state), TI-OPC overshoot suppression, and bus-hold on all A-port inputs in a single 32-bit package - making it the only option qualified for telecom-grade hot-swap backplane systems with variable slot loading.
Availability
SN74GTLPH32945KR is available at Aetrix Electronics and suitable for telecom line cards, industrial backplane interconnects, and automated test equipment requiring stable component supply, long-term lifecycle continuity, and traceable sourcing for mission-critical deployments.
Supply support for SN74GTLPH32945KR 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 and industrial-grade reliability.
The SN74GTLPH32945KR belongs to TI's Widebus+™ family of high-speed bus transceivers, designed specifically for robust, low-noise, live-insertion-capable communication between LVTTL logic and GTLP backplanes in carrier-class networking and instrumentation systems.
FAQ
What voltage levels does the SN74GTLPH32945KR support on its A and B ports?
The SN74GTLPH32945KR supports LVTTL logic levels (0 V / 3.3 V) on its A port and control inputs, which are 5-V tolerant. The B port operates at GTLP signal levels with VTT = 1.5 V and VREF = 1 V. It can also operate at GTL levels (VTT = 1.2 V, VREF = 0.8 V), though ac specifications are guaranteed only for GTLP.
How does the SN74GTLPH32945KR support live insertion into an active backplane?
The SN74GTLPH32945KR supports live insertion through three integrated features: Ioff circuitry disables outputs when VCC = 0 V to prevent current backflow; power-up 3-state holds outputs high-impedance during power ramp; and BIAS VCC precharges B-port I/O before VCC rises, eliminating disturbance to active backplane signals during card insertion.
What is the purpose of the BIAS VCC pin on the SN74GTLPH32945KR?
The BIAS VCC pin on the SN74GTLPH32945KR supplies precharge voltage to the B-port input/output circuitry before main VCC ramps up. This ensures B-port lines are conditioned to ~1 V prior to VCC application, preventing transient glitches or false toggling on the GTLP backplane during hot-plug events - a critical requirement for telecom line card reliability.
Does the SN74GTLPH32945KR include bus-hold functionality, and where is it applied?
Yes, the SN74GTLPH32945KR includes active bus-hold circuitry on all A-port data inputs (1A1–4A8). This feature maintains undriven or floating LVTTL inputs at a valid logic state without external resistors, improving noise immunity and simplifying board design. Bus-hold is not present on B-port inputs or control pins.
What is the maximum distributed load impedance the SN74GTLPH32945KR can drive reliably?
The SN74GTLPH32945KR is characterized to drive distributed backplane loads with equivalent impedance down to 19 Ω, verified using TI's RLC network model (LL = 19 nH, CL = 9 pF, ZO = 70 Ω). Its 50 mA GTLP output drive and TI-OPC circuitry ensure clean signal integrity even under worst-case uneven slot loading conditions.
SN74GTLPH32945KR 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:
- 4
- Channels per Circuit:
- 8
- Voltage - VCCA:
- -
- Voltage - VCCB:
- -
- Input Signal:
- LVTTL
- Output Signal:
- GTLP
- Output Type:
- Non-Inverted
- Data Rate:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Features:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 96-LFBGA
SN74GTLPH32945KR FAQ
1.How can I place an order for SN74GTLPH32945KR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74GTLPH32945KR 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 SN74GTLPH32945KR reliable?
The price and inventory of SN74GTLPH32945KR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74GTLPH32945KR is usually 5 days.
3.What payment methods are accepted for SN74GTLPH32945KR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74GTLPH32945KR transactions.
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4.How is shipping managed for SN74GTLPH32945KR?
SN74GTLPH32945KR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74GTLPH32945KR 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 SN74GTLPH32945KR?
For technical support, including SN74GTLPH32945KR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74GTLPH32945KR requirements.
6.How does Aetrix verify that SN74GTLPH32945KR is sourced from the original manufacturer or authorized distributors?
All SN74GTLPH32945KR 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 SN74GTLPH32945KR meets industry standards.
7.What is the process for return or replacement of SN74GTLPH32945KR?
All SN74GTLPH32945KR units undergo pre-shipment inspection (PSI). If there is an issue with SN74GTLPH32945KR, 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 SN74GTLPH32945KR part is unused and in its original packaging.
Return procedure for SN74GTLPH32945KR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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