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Texas Instruments SN74GTLP1394PWR
- Part No.:
- SN74GTLP1394PWR
- Manufacturer:
- Texas Instruments
- Category:
- Translators, Level Shifters
- Package:
- Datasheet:
-
SN74GTLP1394PWR.pdf
- Description:
- IC TRANSLATOR BIDIR 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,094
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Product details
Overview
SN74GTLP1394PWR from Texas Instruments is a 2-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 (A/Y ports) and GTLP backplane signals (B port), 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.
For engineers reviewing the SN74GTLP1394PWR datasheet, SN74GTLP1394PWR pinout, SN74GTLP1394PWR application, or SN74GTLP1394PWR equivalent, key selection considerations include GTLP/LVTTL voltage domain bridging, ERC-controlled edge-rate optimization for backplane signal integrity, polarity-selectable true/inverted data paths, and support for IEEE 1394 backplane physical-layer interfaces in VME/FB+/CPCI systems.
Technical Context
The SN74GTLP1394PWR implements TI-OPC™ circuitry to actively limit overshoot during low-to-high transitions on unevenly terminated backplanes, and OEC™ circuitry to reduce electromagnetic interference and improve bus-settling time. Its dual-path architecture separates LVTTL inputs (A1/A2) and outputs (Y1/Y2), enabling real-time diagnostics monitoring via the feedback path.
It operates with GTLP signal levels (VTT = 1.5 V, VREF = 1 V) or GTL (VTT = 1.2 V, VREF = 0.8 V), features adjustable edge-rate control (ERC input selects slow/fast B-port rise/fall times), and supports hot-plug capability through dedicated BIAS VCC precharge and Ioff protection that disables outputs during power-down.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage (VCC) | 3.15 V to 3.45 V - ensures stable operation within 3.3-V LVTTL domain with ±4.5% tolerance |
| GTLP Output Drive | 100 mA sink - enables incident-wave switching on backplane loads as low as 11 Ω |
| LVTTL I/O Drive | –24 mA / 24 mA - compatible with standard 3.3-V LVTTL logic and 5-V tolerant inputs |
| Propagation Delay (A→B, Fast) | Typ. 3.6 ns - supports 100-Mbps IEEE 1394 backplane data rates with margin |
| B-Port Rise/Fall Time | 1.2 ns / 1.8 ns (Fast), 2.0 ns / 2.5 ns (Slow) - ERC-selectable for optimal signal integrity vs. speed trade-off |
| Live Insertion Support | Ioff < 10 µA at VCC = 0, BIAS VCC = 0 - prevents damaging current backflow during card removal |
| Input Clamp Current | ±50 mA - protects against ESD events per JESD 22 (2000-V HBM, 200-V MM, 1000-V CDM) |
Pinout & Package
TSSOP-16 (PW) package: 4.4 mm × 5 mm body, 0.65 mm pitch, exposed thermal pad, RoHS-compliant NIPDAU/SN finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OEBY) | Output Enable for Y1/Y2 | Active-low control of LVTTL outputs; tied to GND for always-enabled receive path in 1394 PHY interface |
| 2 (Y1) | LVTTL Output (Feedback Path) | Provides mirrored A1 data for diagnostics/monitoring; driven only when OEBY = low |
| 3 (Y2) | LVTTL Output (Feedback Path) | Provides mirrored A2 data; complements split-port architecture for strobe/data monitoring |
| 4 (VCC) | 3.3-V Supply | Primary power for LVTTL logic; must be ramped after BIAS VCC for live-insertion compliance |
| 5 (A1) | LVTTL Input (Data) | Accepts 3.3-V LVTTL or 5-V tolerant signals from link-layer controller; feeds B1 and Y1 paths |
| 6 (A2) | LVTTL Input (Strobe) | Accepts strobe/control signal; paired with A1 for 1394 PHY data/strobe interface |
| 7 (OEAB) | Output Enable for B1/B2 | Active-low control of GTLP outputs; connected to PHY OCDOE for transmit gating |
| 8 (ERC) | Edge-Rate Control | Adjusts B-port rise/fall times: GND = slow (2.0/2.5 ns), VCC = fast (1.2/1.8 ns) |
| 9 (BIAS VCC) | Backplane Precharge Supply | 3.3-V supply for B-port I/O precharge; enables live insertion by conditioning backplane pins before VCC ramp |
| 10 (VREF) | GTLP Differential Reference | 1.0 V reference for B-port receivers; set to 2/3 × VTT (1.5 V) for optimal noise margin |
| 11 (B1) | GTLP Bidirectional I/O | Transmits A1 data to backplane or receives backplane data to Y1; differential input referenced to VREF |
| 12 (B2) | GTLP Bidirectional I/O | Transmits A2 strobe or receives backplane strobe; paired with B1 for full 1394 PHY interface |
| 13 (GND) | Ground | Common return for all domains; multiple GND pins (1, 8, 13, 16) minimize ground bounce |
| 14 (GND) | Ground | Second dedicated ground pin adjacent to B1 for improved GTLP signal integrity |
| 15 (GND) | Ground | Third ground pin adjacent to B2; reduces crosstalk in high-speed bidirectional GTLP paths |
| 16 (T/C) | Polarity Control | Selects true (T/C = high) or complementary (T/C = low) data transmission in both directions |
Key Features
| Feature | Design Value |
|---|---|
| TI-OPC™ Overshoot Control | Actively limits ringing on unevenly loaded backplanes, maintaining noise margin at >50 MHz operation |
| OEC™ Signal Integrity Enhancement | Reduces EMI and shortens bus settling time via optimized output driver architecture |
| Split LVTTL Port with Feedback | Separate A-input and Y-output pins enable real-time diagnostics without interrupting data flow |
| Adjustable Edge-Rate Control (ERC) | Single-pin selection of B-port rise/fall times to match specific backplane impedance and length |
| Live Insertion Support | Ioff, power-up 3-state, and BIAS VCC collectively prevent bus conflicts and data corruption during hot-swap |
| Selectably Inverted Data Path | T/C input toggles polarity for both A→B and B→Y directions, supporting legacy or protocol-mandated inversion |
Applications
| IEEE 1394 Backplane Interface | VME/FB+/CPCI Diagnostic Bus |
|---|---|
|
Use Scenario: Interfacing TSB14AA1 1394 PHY to host link-layer controller across parallel backplane. IC Role / Device Role / Timing Role: Translates LVTTL data/strobe (A1/A2) to GTLP backplane signals (B1/B2) and provides mirrored feedback (Y1/Y2) for real-time status monitoring. Use Value: Enables 100-Mbps 1394 backplane operation with live insertion, eliminating need for external level shifters or discrete termination networks. |
Use Scenario: Adding auxiliary 2-bit diagnostic bus to legacy VME or CompactPCI chassis for remote node health monitoring. IC Role / Device Role / Timing Role: Bridges LVTTL-based service processor to GTLP backplane, delivering isolated control/status signals with polarity selection for protocol alignment. Use Value: Provides deterministic, low-jitter timing path for CSR access and fault reporting without modifying existing backplane layout. |
| Hot-Swappable Module Control | High-Speed Clock Distribution |
|
Use Scenario: Enabling safe insertion/removal of daughter cards in telecom or industrial backplane systems. IC Role / Device Role / Timing Role: Manages GTLP backplane I/O precharge (via BIAS VCC), output disable (Ioff), and power-up 3-state sequencing to prevent bus contention. Use Value: Guarantees zero data corruption during card swap, meeting IEC 61000-4-2 Level 4 ESD and live-insertion reliability requirements. |
Use Scenario: Distributing synchronized clock/strobe pairs across multi-slot backplane for ATM or packet-switching applications. IC Role / Device Role / Timing Role: Delivers matched-delay, edge-controlled GTLP clock (B1) and strobe (B2) with sub-5 ns skew and <2 ns edge-rate tuning. Use Value: Achieves <100 ps inter-channel skew across 20-slot backplane, supporting 50+ MHz synchronous read/write operations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74GTLP1395PWR | 4-bit version with identical pinout, ERC, and live-insertion features; higher channel count but larger footprint | Suitable for systems requiring four independent GTLP/LVTTL paths instead of two | Choose SN74GTLP1395PWR only if additional data/strobe lanes are needed; otherwise SN74GTLP1394PWR offers better board density |
| SN74GTLP1394DR | Same electrical specs and functionality, but in SOIC-16 (D) package with 1.27 mm pitch and no exposed thermal pad | Better suited for through-hole prototyping or legacy PCBs not designed for TSSOP | Select SN74GTLP1394DR for manual assembly or compatibility with older layouts; SN74GTLP1394PWR preferred for high-density SMT production |
Compared with SN74GTLP1395PWR and SN74GTLP1394DR, the SN74GTLP1394PWR uniquely balances compact TSSOP-16 packaging, live-insertion robustness, and precise edge-rate control-making it optimal for space-constrained, hot-pluggable 1394 backplane nodes where 2-bit bandwidth suffices.
Availability
SN74GTLP1394PWR is available at Aetrix Electronics and suitable for IEEE 1394 backplane interfaces, VME/CPCI diagnostic buses, and hot-swappable module control systems requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for SN74GTLP1394PWR 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 connectivity technologies, with over 50 years of innovation in high-speed interface solutions.
The SN74GTLP1394PWR belongs to TI's GTLP transceiver product line, engineered specifically for robust, high-data-rate communication between LVTTL controllers and GTLP backplanes in industrial, telecom, and computing infrastructure.
FAQ
What is the primary function of the SN74GTLP1394PWR in a backplane system?
The SN74GTLP1394PWR serves as a bidirectional LVTTL-to-GTLP level translator, enabling high-speed data and strobe transfer between a 3.3-V link-layer controller and a GTLP backplane. It supports IEEE 1394 backplane protocols with features like adjustable edge-rate control, polarity selection, and split-port feedback-making it essential for reliable communication in VME, FB+, and CPCI systems. The SN74GTLP1394PWR integrates TI-OPC and OEC circuitry to maintain signal integrity under varying load conditions.
How does the ERC pin affect the performance of the SN74GTLP1394PWR?
The ERC (Edge-Rate Control) pin on the SN74GTLP1394PWR selects between slow and fast GTLP output edge rates: ERC = GND yields ~2.0 ns rise / ~2.5 ns fall times, while ERC = VCC gives ~1.2 ns rise / ~1.8 ns fall times. This adjustment allows designers to optimize signal integrity versus timing margin for specific backplane impedance and length. The SN74GTLP1394PWR's ERC feature directly impacts noise margin, overshoot, and maximum achievable data rate without requiring external RC networks.
Can the SN74GTLP1394PWR be used in live-insertion applications, and what features enable this?
Yes, the SN74GTLP1394PWR is explicitly designed for live-insertion applications. It incorporates three key features: Ioff circuitry (limits off-state current to <10 µA when VCC = 0), power-up 3-state (holds outputs high-Z during power ramp), and BIAS VCC precharge (conditions GTLP I/O pins before VCC is applied). These ensure no bus conflict or data corruption occurs during card insertion or removal. All these capabilities are validated in the SN74GTLP1394PWR's characterization and are critical for telecom and industrial hot-swap systems.
What is the role of the T/C pin on the SN74GTLP1394PWR?
The T/C (True/Complement) pin on the SN74GTLP1394PWR selects data polarity for both transmission directions: when T/C = high, A→B and B→Y paths operate in true mode; when T/C = low, both paths invert data. This enables protocol-level compatibility-for example, matching inverted strobe conventions in certain 1394 PHY implementations. The SN74GTLP1394PWR's T/C function is implemented at the silicon level and affects propagation delay symmetrically in both directions, preserving timing integrity.
What are the recommended operating conditions for VREF and VTT when using the SN74GTLP1394PWR in GTLP mode?
In GTLP mode, the SN74GTLP1394PWR requires VTT = 1.5 V ±0.15 V and VREF = 1.0 V ±0.13 V, with VREF typically set to 2/3 × VTT for optimal noise margin. Deviations beyond these ranges degrade receiver sensitivity and increase bit-error rate. The SN74GTLP1394PWR's internal design assumes this relationship; using VREF outside the specified range may cause false triggering or reduced immunity to ground bounce. TI recommends tight regulation and local decoupling for both supplies.
SN74GTLP1394PWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74GTLP
- Package/Case:
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Translator Type:
- Mixed Signal
- Channel Type:
- Bidirectional
- Number of Circuits:
- 1
- Channels per Circuit:
- 2
- Voltage - VCCA:
- -
- Voltage - VCCB:
- -
- Input Signal:
- LVTTL
- Output Signal:
- GTLP
- Output Type:
- Tri-State, Inverted
- Data Rate:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Features:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TSSOP (0.173", 4.40mm Width)
SN74GTLP1394PWR FAQ
1.How can I place an order for SN74GTLP1394PWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74GTLP1394PWR 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 SN74GTLP1394PWR reliable?
The price and inventory of SN74GTLP1394PWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74GTLP1394PWR is usually 5 days.
3.What payment methods are accepted for SN74GTLP1394PWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74GTLP1394PWR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74GTLP1394PWR?
SN74GTLP1394PWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74GTLP1394PWR 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 SN74GTLP1394PWR?
For technical support, including SN74GTLP1394PWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74GTLP1394PWR requirements.
6.How does Aetrix verify that SN74GTLP1394PWR is sourced from the original manufacturer or authorized distributors?
All SN74GTLP1394PWR 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 SN74GTLP1394PWR meets industry standards.
7.What is the process for return or replacement of SN74GTLP1394PWR?
All SN74GTLP1394PWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74GTLP1394PWR, 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 SN74GTLP1394PWR part is unused and in its original packaging.
Return procedure for SN74GTLP1394PWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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