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Texas Instruments SN74GTLP1394DR
- Part No.:
- SN74GTLP1394DR
- Manufacturer:
- Texas Instruments
- Category:
- Translators, Level Shifters
- Package:
- Datasheet:
-
SN74GTLP1394DR.pdf
- Description:
- IC TRANSLTR BIDIRECTIONAL 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,894
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Product details
Overview
SN74GTLP1394DR 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 high-drive GTLP outputs (100 mA sink) for incident-wave switching on heavily loaded backplanes down to 11 Ω.
For engineers reviewing the SN74GTLP1394DR datasheet, SN74GTLP1394DR pinout, SN74GTLP1394DR application, or SN74GTLP1394DR equivalent, this device is selected for IEEE 1394 backplane physical-layer interfacing in VME, CPCI, and FB+ systems requiring robust hot-plug capability, differential noise margin optimization, and adjustable edge-rate control for signal integrity tuning across distributed loads.
Technical Context
The SN74GTLP1394DR 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 features polarity-selectable data transmission (true/inverted via T/C input), independent output enables (OEAB for B-port, OEBY for Y-outputs), and adjustable edge-rate control (ERC input selects slow/fast B-port rise/fall times). The BIAS VCC pin preconditions B-port I/Os during card insertion/removal, ensuring true live-insertion compatibility without backplane disturbance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Supply | 3.15–3.45 V nominal; powers LVTTL interface and internal logic; enables operation within standard 3.3-V systems |
| GTLP Signal Levels | VTT = 1.5 V, VREF = 1 V; defines GTLP-compatible differential receiver threshold and termination voltage for noise margin compliance |
| B-Port Drive | 100 mA sink current; supports incident-wave switching on backplanes with characteristic impedance as low as 11 Ω |
| Propagation Delay (A→B) | Typ. 3.6 ns (fast edge), 4.2 ns (slow edge); enables reliable 50–100 Mbps IEEE 1394 backplane data rates |
| Hot-Insertion Support | Ioff < 10 µA at VCC = 0; power-up 3-state; BIAS VCC = 3.3 V; prevents current backflow and bus conflict during live card swap |
| Input Tolerance | LVTTL inputs tolerate 0–5.5 V; compatible with TTL and 5-V CMOS logic without level-shifting circuitry |
| Edge-Rate Control | ERC = GND → slow (tr/tf ≈ 2/2.5 ns); ERC = VCC → fast (tr/tf ≈ 1.2/1.8 ns); allows system-level SI tuning |
Pinout & Package
SN74GTLP1394DR is housed in a 16-pin SOIC (D) package with 1.27-mm pitch, JEDEC MS-012AC compliant, RoHS-compliant NIPDAU finish, and moisture sensitivity level 1 (unlimited reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (GND) | Ground reference | Primary ground connection for A-port, control logic, and internal biasing; must be connected before VCC in live-insertion sequence |
| 2 (B1) | GTLP bidirectional data I/O | B-port differential data line 1; operates at GTLP levels (VTT = 1.5 V); supports both transmit and receive paths |
| 3 (GND) | Ground reference | Second ground pin; decouples B-port I/O section; improves noise immunity on high-speed backplane traces |
| 4 (B2) | GTLP bidirectional data I/O | B-port differential strobe line 2; paired with B1 for 1394 backplane DATA/STRB signaling |
| 5 (GND) | Ground reference | Third ground pin; isolates VREF and analog-sensitive circuitry from digital switching noise |
| 6 (VREF) | Differential input reference | Reference voltage for B-port GTLP receivers; set to 1 V for GTLP mode; determines input threshold and noise margin |
| 7 (Y1) | LVTTL output | Feedback path output 1; drives LVTTL logic (–24/+24 mA); connects to TSB14AA1 PHY Rdata or diagnostic monitor |
| 8 (Y2) | LVTTL output | Feedback path output 2; complements Y1 for strobe/data pair; enables real-time backplane signal observation |
| 9 (VCC) | Supply voltage | 3.3-V core supply for LVTTL interface, control logic, and internal regulators; must ramp at ≤20 µs/V |
| 10 (A1) | LVTTL input | A-port data input 1; 5-V tolerant; connects to PHY Tdata or host controller; feeds B1 via transparent/inverted path |
| 11 (A2) | LVTTL input | A-port strobe input 2; pairs with A1; enables synchronous 2-bit 1394 backplane transmission |
| 12 (OEAB) | Output enable (A→B) | Active-low control for B-port drivers; tied to PHY OCDOE; disables B1/B2 when high to prevent bus contention |
| 13 (OEBY) | Output enable (B→Y) | Active-low control for Y1/Y2; typically grounded to maintain continuous feedback monitoring of backplane activity |
| 14 (T/C) | Polarity control | High = true mode (A→B, B→Y); low = inverted mode (¬A→B, ¬B→Y); matches TSB14AA1 default inverted signaling |
| 15 (ERC) | Edge-rate control | Adjusts B-port output slew rate: GND = slow (optimized for S50/S100), VCC = fast (for higher-margin layouts) |
| 16 (BIAS VCC) | Live-insertion bias supply | 3.3-V precharge rail for B-port I/O; must be applied before VCC to enable safe card insertion without backplane disturbance |
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 100 Mbps |
| OEC™ EMI Reduction | Minimizes electromagnetic emissions during high-speed switching by optimizing output driver dI/dt and waveform symmetry |
| Split LVTTL Port Architecture | Separates A1/A2 (inputs) and Y1/Y2 (outputs) to provide non-intrusive, real-time backplane signal monitoring for diagnostics |
| Selectable Polarity (T/C) | Enables true or inverted data flow in both directions without external inverters-critical for matching TSB14AA1 PHY signaling convention |
| Adjustable Edge-Rate (ERC) | Allows system-level trade-off between data rate and signal integrity: slow edge for long traces, fast edge for short, well-terminated runs |
Applications
| IEEE 1394 Backplane Diagnostics | VME/CPCI Live-Insertion Interface |
|---|---|
Use Scenario: Monitoring real-time 1394 backplane DATA/STRB signals during system bring-up and field maintenance without disrupting active traffic. IC Role / Device Role / Timing Role: SN74GTLP1394DR acts as a passive observation node, routing B1/B2 signals to Y1/Y2 while maintaining full bidirectional data path integrity. Use Value: Enables hardware-level validation of backplane signal integrity, timing skew, and PHY handshake correctness using standard LVTTL test equipment. | Use Scenario: Adding hot-pluggable 1394 connectivity to legacy VME or CompactPCI chassis where daughter cards require live replacement under power. IC Role / Device Role / Timing Role: SN74GTLP1394DR serves as the physical-layer bridge between the 3.3-V TSB14AA1 PHY and GTLP backplane, managing level translation and insertion sequencing. Use Value: Eliminates need for custom backplane redesign or external clamping circuits-BIAS VCC and Ioff ensure zero bus disturbance during card swap. |
| FB+ System Auxiliary Control Bus | Industrial Embedded 1394 Monitor Link |
Use Scenario: Implementing a dedicated 2-bit auxiliary bus for CSR access, fault reporting, and configuration ROM reads across FutureBus+ slots. IC Role / Device Role / Timing Role: SN74GTLP1394DR provides isolated, low-latency communication channel between host controller and slot-specific peripherals using existing GTLP infrastructure. Use Value: Delivers deterministic sub-5-ns propagation delay and 100-Mbps capability-exceeding requirements for register-level CSR reads in real-time control systems. | Use Scenario: Connecting temperature sensors, fan controllers, and power supplies to an IPMI-compliant management controller via a dedicated 1394 monitor link. IC Role / Device Role / Timing Role: SN74GTLP1394DR interfaces industrial-grade LVTTL monitoring ICs to a GTLP backplane segment reserved for out-of-band management traffic. Use Value: Leverages GTLP's low-voltage swing (<1 V) and differential noise rejection to maintain reliability in electrically noisy factory-floor environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74GTLP1395DR | 4-bit version with identical pinout, ERC, BIAS VCC, and live-insertion features; double the channel count | Suitable for systems requiring parallel 4-bit 1394 data/strobe lanes; not drop-in for 2-bit designs due to pin function mapping | Select SN74GTLP1395DR only when expanding lane count; requires PCB layout change and updated firmware handling of extra bits |
| SN65LVDS31DR | LVDS transceiver (3.3-V, 400 Mbps), no ERC or BIAS VCC; differential signaling only; no LVTTL/GTLP translation | Used in point-to-point LVDS links-not for multidrop GTLP backplanes; lacks live-insertion support and 5-V tolerance | Choose SN65LVDS31DR for high-speed serial interconnects where GTLP infrastructure is absent; not a functional substitute for SN74GTLP1394DR in 1394 backplane roles |
Compared with SN74GTLP1395DR and SN65LVDS31DR, the SN74GTLP1394DR uniquely combines 2-bit GTLP/LVTTL translation, adjustable edge-rate control, and full live-insertion support in a 16-pin SOIC package-making it irreplaceable for IEEE 1394 backplane PHY interfacing in VME/CPCI/FB+ systems.
Availability
SN74GTLP1394DR is available at Aetrix Electronics and suitable for IEEE 1394 backplane diagnostics, VME/CPCI live-insertion interfaces, and FB+ auxiliary control buses requiring stable component supply across extended production lifecycles.
Supply support for SN74GTLP1394DR 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-reliability interface solutions.
The SN74GTLP1394DR belongs to TI's GTLP family of backplane transceivers, engineered specifically for IEEE 1394 physical-layer interfacing in industrial and telecom backplane systems requiring hot-plug capability, noise-immune signaling, and deterministic timing.
FAQ
What is the primary function of the SN74GTLP1394DR in a 1394 backplane system?
The SN74GTLP1394DR serves as a bidirectional LVTTL-to-GTLP bus transceiver that bridges the TSB14AA1 1394 PHY to the GTLP backplane. It translates 3.3-V LVTTL signals (A1/A2) to GTLP levels (B1/B2) and provides a feedback path (Y1/Y2) for diagnostics. Its TI-OPC™ and OEC™ circuitry ensures signal integrity at 25–100 Mbps, and BIAS VCC enables true live insertion without backplane disturbance. The SN74GTLP1394DR is essential for implementing IEEE 1394 backplane physical-layer functionality in VME, CPCI, and FB+ systems.
How does the ERC pin affect SN74GTLP1394DR performance in real-world backplane layouts?
The ERC pin on the SN74GTLP1394DR selects between slow (ERC = GND) and fast (ERC = VCC) B-port output edge rates, directly impacting signal integrity and maximum achievable data rate. In long, unterminated, or high-impedance backplane traces, slow edges (tr/tf ≈ 2/2.5 ns) suppress ringing and overshoot; in short, well-terminated runs, fast edges (tr/tf ≈ 1.2/1.8 ns) reduce propagation delay and support tighter timing margins. This adjustability allows designers to optimize the SN74GTLP1394DR for specific mechanical layouts without hardware changes.
Why is BIAS VCC required for live insertion, and how must it be sequenced relative to VCC?
BIAS VCC on the SN74GTLP1394DR precharges and preconditions the B-port I/O pins before main power-up, preventing transient disturbances on the active backplane during card insertion. To ensure correct operation, the recommended sequence is: GND and BIAS VCC = 3.3 V first, then B-port I/O connections, and finally VCC = 3.3 V. If BIAS VCC is applied after VCC, its precharge circuitry is disabled. This sequencing is mandatory for reliable live-insertion behavior-failure to follow it may cause bus glitches or latch-up. The SN74GTLP1394DR datasheet specifies this as a hard requirement, not a recommendation.
Can the SN74GTLP1394DR operate with GTL instead of GTLP signal levels, and what changes are needed?
Yes, the SN74GTLP1394DR supports both GTL (VTT = 1.2 V, VREF = 0.8 V) and GTLP (VTT = 1.5 V, VREF = 1 V) standards. To use GTL, set VTT to 1.2 V and VREF to 0.8 V; the device's AC specifications remain valid, though noise margin is reduced compared to GTLP. TI-OPC™ circuitry remains active only when VTT > VREF + 0.7 V, so it functions in GTL mode but with slightly lower overshoot suppression. All other SN74GTLP1394DR features-including Ioff, BIAS VCC, and ERC-operate identically. No pin or configuration changes are required beyond adjusting the external supply and reference voltages.
What is the role of the T/C input, and how does it interact with the SN74GTLP1394DR's polarity modes?
The T/C (True/Complement) input on the SN74GTLP1394DR selects data polarity for both A→B and B→Y signal paths. When T/C = high, data flows transparently: A1→B1, A2→B2, B1→Y1, B2→Y2. When T/C = low, all paths invert: ¬A1→B1, ¬A2→B2, ¬B1→Y1, ¬B2→Y2. This matches the default inverted signaling of the TSB14AA1 PHY, eliminating need for external inverters. The SN74GTLP1394DR's functional table confirms T/C directly controls the logic state of internal XOR gates-no timing penalty or added latency occurs in either mode.
SN74GTLP1394DR 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-SOIC (0.154", 3.90mm Width)
SN74GTLP1394DR FAQ
1.How can I place an order for SN74GTLP1394DR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74GTLP1394DR 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 SN74GTLP1394DR reliable?
The price and inventory of SN74GTLP1394DR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74GTLP1394DR is usually 5 days.
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SN74GTLP1394DR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74GTLP1394DR 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 SN74GTLP1394DR?
For technical support, including SN74GTLP1394DR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74GTLP1394DR requirements.
6.How does Aetrix verify that SN74GTLP1394DR is sourced from the original manufacturer or authorized distributors?
All SN74GTLP1394DR 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 SN74GTLP1394DR meets industry standards.
7.What is the process for return or replacement of SN74GTLP1394DR?
All SN74GTLP1394DR units undergo pre-shipment inspection (PSI). If there is an issue with SN74GTLP1394DR, 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 SN74GTLP1394DR part is unused and in its original packaging.
Return procedure for SN74GTLP1394DR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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