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Texas Instruments SN74GTLP1394D
- Part No.:
- SN74GTLP1394D
- Manufacturer:
- Texas Instruments
- Category:
- Translators, Level Shifters
- Package:
- Datasheet:
-
SN74GTLP1394D.pdf
- Description:
- IC TRANSLTR BIDIRECTIONAL 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,172
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Product details
Overview
SN74GTLP1394D 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 (5-V tolerant) and GTLP backplane signals (VTT = 1.5 V, VREF = 1 V), supports live insertion via Ioff, power-up 3-state, and BIAS VCC, and delivers 100 mA GTLP output drive for incident-wave switching into 11-Ω backplane loads.
For engineers reviewing the SN74GTLP1394D datasheet, SN74GTLP1394D pinout, SN74GTLP1394D application, or SN74GTLP1394D equivalent, this device is selected for IEEE 1394 backplane physical-layer interfacing in VME, CPCI, and FB+ systems requiring hot-pluggable diagnostics, real-time control, and high-signal-integrity data transfer at 25–100 Mbps.
Technical Context
The SN74GTLP1394D implements TI-OPC™ circuitry to actively limit overshoot on unevenly loaded backplanes and OEC™ circuitry to reduce EMI and improve settling time. Its dual-path architecture separates A-port (LVTTL input/output) and Y-output (LVTTL feedback) pins, enabling real-time monitoring of backplane activity without disrupting data flow.
Variable edge-rate control (ERC) adjusts B-port rise/fall times (1.2–2.5 ns fast mode; 2.0–3.2 ns slow mode) by setting ERC voltage to GND (slow) or VCC (fast), optimizing timing margin versus noise in distributed RLC backplane loads. Polarity control (T/C) selects true or complementary data transmission in both directions, supporting diagnostic inversion and protocol alignment.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Supply | 3.15–3.45 V: Ensures stable operation with ±3% tolerance for GTLP interface compliance. |
| GTLP Output Drive | 100 mA sink: Enables incident-wave switching into heavily loaded backplanes down to 11 Ω impedance. |
| LVTTL I/O Drive | ±24 mA: Supports direct connection to 5-V-tolerant microcontrollers and FPGAs without level-shifting. |
| Propagation Delay (A→B) | 3.6–4.2 ns (fast/slow): Meets timing budgets for 100-Mbps IEEE 1394 backplane signaling. |
| Live Insertion Support | Ioff < 10 µA at VCC = 0 V: Prevents backflow current during card removal; BIAS VCC precharges B-port I/O. |
| Input Voltage Range | A-port/controls: 0–5.5 V; B-port: –0.5 to 4.6 V - enables interoperability with TTL, CMOS, and GTLP domains. |
| Operating Temperature | –40°C to +85°C: Qualified for industrial and embedded backplane environments. |
Pinout & Package
SN74GTLP1394D uses a 16-pin SOIC (D) package with 1.27-mm pitch, JEDEC MS-012AC compliant, and moisture sensitivity level 1 (260°C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 7, 10, 13 | GND | Ground reference for all signal domains; five dedicated pins minimize ground bounce in high-speed switching. |
| 2, 5 | B1, B2 | GTLP bidirectional backplane I/O; differential inputs referenced to VREF (pin 10), outputs drive 1.5-V terminated lines. |
| 3, 6 | A1, A2 | LVTTL inputs from host controller (e.g., TSB14AA1 PHY); 5-V tolerant, compatible with TTL/CMOS logic families. |
| 8, 9 | Y1, Y2 | LVTTL outputs providing feedback path to link-layer controller; enables real-time diagnostics and status monitoring. |
| 11 | VCC | Main 3.3-V supply for internal logic and LVTTL I/O; decoupling required per TI layout guidelines. |
| 12 | OEAB | Active-low enable for B-port outputs; tied to OCDOE from 1394 PHY to gate backplane transmit activity. |
| 14 | OEBY | Active-low enable for Y outputs; typically grounded to maintain continuous feedback monitoring. |
| 15 | T/C | Polarity control: high = true data, low = inverted data - aligns with IEEE 1394 strobe/data inversion requirements. |
| 16 | ERC | Edge-rate control: GND = slow (2.0–3.2 ns), VCC = fast (1.2–2.5 ns) - tunes signal integrity to backplane load profile. |
Key Features
| Feature | Design Value |
|---|---|
| TI-OPC™ Overshoot Control | Actively limits low-to-high transition overshoot on unterminated or unevenly loaded backplanes, preserving noise margin at >50 MHz. |
| OEC™ Signal Integrity Enhancement | Reduces electromagnetic interference and bus settling time via optimized output driver architecture and termination-aware design. |
| Split LVTTL Port Architecture | Separates A-inputs (host-side) and Y-outputs (feedback) to enable non-intrusive diagnostics and real-time control path monitoring. |
| Adjustable Edge-Rate Control (ERC) | Allows dynamic tuning of B-port rise/fall times (1.2–3.2 ns) to match trace impedance and load distribution without hardware change. |
| Live Insertion Support | Combines Ioff, power-up 3-state, and BIAS VCC to prevent data corruption, bus contention, and backplane disturbance during hot-plug events. |
Applications
| IEEE 1394 Backplane Diagnostics | VME/CPCI System Management |
|---|---|
Use Scenario: Real-time monitoring of backplane data/strobe signals during system boot, fault isolation, or maintenance mode. IC Role / Device Role / Timing Role: SN74GTLP1394D provides isolated LVTTL feedback (Y1/Y2) of GTLP backplane activity while maintaining transparent data flow (A1/A2 ↔ B1/B2). Use Value: Enables software-accessible diagnostics without interrupting primary bus traffic or requiring additional probing hardware. |
Use Scenario: Adding hot-pluggable 1394-based control and status channels to legacy VME or CompactPCI chassis. IC Role / Device Role / Timing Role: SN74GTLP1394D bridges LVTTL host controllers (e.g., TSB14AA1) to GTLP backplane traces, supporting live insertion and CSR access. Use Value: Delivers plug-and-play capability and auxiliary 2-bit bus with full 64-bit address space for peripheral monitoring and fault recovery. |
| Industrial Live-Insertion Interfaces | High-Speed Backplane Clock Distribution |
Use Scenario: Hot-swap I/O modules in industrial automation systems where uninterrupted operation is critical. IC Role / Device Role / Timing Role: SN74GTLP1394D isolates module-level LVTTL logic from shared GTLP backplane using Ioff and BIAS VCC during insertion/removal. Use Value: Eliminates need for external sequencing circuitry; prevents bus lockup and ensures deterministic recovery after card replacement. |
Use Scenario: Distributing synchronized clock and strobe signals across multi-slot backplanes for ATM or packet-switched applications. IC Role / Device Role / Timing Role: SN74GTLP1394D transmits low-jitter, edge-controlled clock (A2→B2) and data (A1→B1) pairs with matched propagation delays (≤0.6 ns skew). Use Value: Achieves sub-nanosecond inter-signal alignment required for 100-Mbps NRZ-DS encoded 1394 backplane timing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74GTLP1395D | Single-ended GTLP outputs (no differential input); lacks VREF pin and BIAS VCC support. | Not suitable for live-insertion or high-noise backplane environments requiring TI-OPC/OEC. | Select SN74GTLP1395D only for cost-sensitive, non-hot-plug applications with simple lumped-load backplanes. |
| SN74GTLP1397D | Includes integrated 120-Ω termination resistors on B-port; no ERC pin; fixed fast edge rate. | Reduces external component count but sacrifices edge-rate tuning flexibility and diagnostic feedback (no Y outputs). | Choose SN74GTLP1397D when board space is constrained and backplane load is well-characterized, but avoid if polarity control or feedback monitoring is required. |
Compared with SN74GTLP1394D, SN74GTLP1395D omits live-insertion features and differential input support, while SN74GTLP1397D trades adjustable edge-rate and split-port feedback for integrated termination - making SN74GTLP1394D uniquely suited for diagnostic-rich, hot-pluggable 1394 backplane implementations.
Availability
SN74GTLP1394D is available at Aetrix Electronics and suitable for IEEE 1394 backplane diagnostics, VME/CPCI system management, and industrial live-insertion interfaces requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for SN74GTLP1394D 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 decades of expertise in high-speed interface solutions.
The SN74GTLP1394D belongs to TI's GTLP family of backplane transceivers, designed specifically to enable robust, hot-pluggable IEEE 1394 physical-layer connectivity across VME, CPCI, and proprietary parallel backplanes.
FAQ
What is the primary function of the SN74GTLP1394D in a backplane system?
The SN74GTLP1394D serves as a bidirectional LVTTL-to-GTLP bus transceiver that enables high-speed, hot-pluggable communication between a host controller (e.g., TSB14AA1) and a GTLP backplane. It translates 3.3-V LVTTL logic levels to 1.5-V GTLP signal levels while providing feedback monitoring, edge-rate control, and live-insertion support - all essential for IEEE 1394 backplane implementations in VME and CPCI systems. The SN74GTLP1394D is explicitly designed for this role per TI's SCES286F datasheet.
How does the ERC pin affect SN74GTLP1394D performance?
The ERC (Edge-Rate Control) pin on the SN74GTLP1394D selects between two B-port output slew rates: tying ERC to GND yields slow edge rates (rise/fall ~2.0–3.2 ns), while tying it to VCC enables fast edge rates (~1.2–2.5 ns). This adjustment optimizes signal integrity for specific backplane load profiles - slower edges reduce EMI and ringing on long or unevenly terminated traces, while faster edges maximize data-transfer rate in well-matched environments. All timing values in the SN74GTLP1394D datasheet are specified for both modes.
Can SN74GTLP1394D interface directly with 5-V TTL logic?
Yes, the A-port inputs and control pins (OEAB, OEBY, T/C, ERC) of the SN74GTLP1394D are 5-V tolerant, allowing direct connection to standard TTL and 5-V CMOS logic without external level shifters. Input voltage range is specified as 0–5.5 V for these pins, and DC electrical characteristics (e.g., VIH = 2 V min, VIL = 0.8 V max) meet TTL thresholds. However, the B-port and VREF pins operate strictly within GTLP voltage ranges (–0.5 V to 4.6 V) and must not be exposed to 5-V signals. This dual-voltage capability is confirmed in the SN74GTLP1394D Recommended Operating Conditions table.
What is the purpose of the split LVTTL port (A and Y pins) in SN74GTLP1394D?
The split LVTTL port in the SN74GTLP1394D separates A1/A2 (inputs from host controller) from Y1/Y2 (outputs to host controller), creating an independent feedback path. This allows the host to monitor backplane activity (via B1/B2 → Y1/Y2) in real time without interfering with active data transmission (A1/A2 ↔ B1/B2). For example, in IEEE 1394 diagnostics, Y outputs relay strobe/data states for software analysis while maintaining transparent data flow - a capability explicitly documented in the SN74GTLP1394D functional description and application diagrams.
Does SN74GTLP1394D support hot-plug operation, and how is it implemented?
Yes, the SN74GTLP1394D fully supports live insertion via three integrated features: Ioff circuitry disables outputs when VCC = 0 V (preventing backflow current), power-up 3-state places outputs in high-Z during power ramp-up/down, and BIAS VCC precharges B-port I/O lines before VCC is applied - eliminating disturbance to active backplane signals. These mechanisms are validated per JESD 78 Class II latch-up testing and documented in the SN74GTLP1394D live-insertion specifications section, confirming suitability for hot-swap VME/CPCI modules.
SN74GTLP1394D Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74GTLP
- Package/Case:
- Packaging:
- Bulk
- 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-SOIC (0.154", 3.90mm Width)
SN74GTLP1394D FAQ
1.How can I place an order for SN74GTLP1394D through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74GTLP1394D 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 SN74GTLP1394D reliable?
The price and inventory of SN74GTLP1394D are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74GTLP1394D is usually 5 days.
3.What payment methods are accepted for SN74GTLP1394D?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74GTLP1394D transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74GTLP1394D?
SN74GTLP1394D orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74GTLP1394D 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 SN74GTLP1394D?
For technical support, including SN74GTLP1394D datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74GTLP1394D requirements.
6.How does Aetrix verify that SN74GTLP1394D is sourced from the original manufacturer or authorized distributors?
All SN74GTLP1394D 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 SN74GTLP1394D meets industry standards.
7.What is the process for return or replacement of SN74GTLP1394D?
All SN74GTLP1394D units undergo pre-shipment inspection (PSI). If there is an issue with SN74GTLP1394D, 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 SN74GTLP1394D part is unused and in its original packaging.
Return procedure for SN74GTLP1394D:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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