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Texas Instruments SN74GTLP21395DWR
- Part No.:
- SN74GTLP21395DWR
- Manufacturer:
- Texas Instruments
- Category:
- Translators, Level Shifters
- Package:
- Datasheet:
-
SN74GTLP21395DWR.pdf
- Description:
- IC TRANSLTR BIDIRECTIONAL 20SOIC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SN74GTLP21395DWR from Texas Instruments is a dual 1-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, BIAS VCC, and power-up 3-state, and delivers 100 mA GTLP drive for incident-wave switching on heavily loaded backplanes down to 11 Ω.
For engineers reviewing the SN74GTLP21395DWR datasheet, SN74GTLP21395DWR pinout, SN74GTLP21395DWR application, or SN74GTLP21395DWR equivalent, this device is selected for IEEE 1394 backplane PHY interfacing, high-speed distributed-load backplane clock/data routing, and diagnostics monitoring in VME/FB+/CPCI systems requiring true/inverted transparent modes and ERC-controlled edge rates.
Technical Context
The SN74GTLP21395DWR implements two independent 1-bit transceivers, each with separate A (LVTTL input), B (GTLP I/O), and Y (LVTTL output) ports plus dedicated OEAB (B-port enable), OEBY (Y-port enable), and T/C (true/complement polarity select) controls. Its TI-OPC™ circuitry actively limits overshoot during low-to-high transitions on unevenly terminated backplanes, while OEC™ improves signal integrity and reduces EMI.
Variable edge-rate control via the ERC pin selects fast (ERC = L) or slow (ERC = H) B-port rise/fall times - 1.3/2.6 ns (fast) or 2.5/3.0 ns (slow) - enabling optimization of data-transfer rate versus signal integrity across distributed loads. The integrated 26-Ω series termination on Y outputs eliminates external resistors, and BIAS VCC precharges GTLP I/Os to support hot-plug operation without disturbing active backplane data.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage (VCC) | 3.15 V to 3.45 V - ensures stable GTLP/LVTTL interface operation within industrial temperature range |
| GTLP Output Drive | 100 mA sink - enables incident-wave switching on backplanes with equivalent load impedance as low as 11 Ω |
| LVTTL Output Drive | –12 mA / 12 mA - supports direct interfacing with 5-V-tolerant TTL/CMOS logic without level shifters |
| Edge-Rate Control | ERC pin selects fast (1.3 ns tr, 2.6 ns tf) or slow (2.5 ns tr, 3.0 ns tf) B-port transitions - balances speed vs. ringing in distributed loads |
| Live Insertion Support | Ioff < 10 µA at VCC = 0, BIAS VCC = 3.3 V, and power-up 3-state - prevents backflow current and bus conflicts during hot-swap |
| Signal-Level Compatibility | LVTTL port: 5-V tolerant; GTLP port: VTT = 1.5 V, VREF = 1 V - interoperates with TI TSB14AA1 1394 PHY and standard GTLP backplanes |
| Propagation Delay (A→B) | 3.4 ns (fast), 4.2 ns (slow) - meets timing budgets for 50 MHz (S100) and 25 MHz (S50) IEEE 1394 backplane operation |
Pinout & Package
TSSOP-20 (PW) package: 6.5 mm × 4.4 mm, 0.65 mm pitch, surface-mount, RoHS-compliant, moisture sensitivity level (MSL) 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1Y, 2Y | LVTTL output (feedback path) | Provides isolated LVTTL-level copy of B-port data for diagnostics and control monitoring; 26-Ω internal series resistor |
| 1A, 2A | LVTTL input | Accepts 5-V-tolerant LVTTL signals from host controller or link-layer logic; drives B-port under OEAB/T/C control |
| 1B, 2B | GTLP bidirectional I/O | Connects directly to backplane; operates at GTLP levels (VTT = 1.5 V); supports live insertion via BIAS VCC |
| 1OEAB, 2OEAB | B-port output enable | Active-low control: enables/disables GTLP driver; tied together in typical 1394 PHY interface |
| 1OEBY, 2OEBY | Y-port output enable | Active-low control: enables/disables LVTTL feedback outputs; typically grounded for always-on monitoring |
| 1T/C, 2T/C | Polarity select | High = true mode (A→B, B→Y); low = complement mode (inverted A→B, inverted B→Y) - supports diagnostic inversion |
| ERC | Edge-rate control | High = slow edges (2.5/3.0 ns); low = fast edges (1.3/2.6 ns) - tunes signal integrity for specific backplane loading |
| VREF | GTLP differential input reference | Set to 1 V for GTLP; establishes noise margin and threshold for B-port receivers; typically 2/3 × VTT |
| BIAS VCC | Backplane I/O precharge supply | 3.3 V supply that preconditions B-port pins before VCC ramp-up - essential for disturbance-free live insertion |
Key Features
| Feature | Design Value |
|---|---|
| Split LVTTL port with feedback path | Separate A (input) and Y (output) pins per channel enable real-time monitoring of backplane data without interrupting primary signal flow |
| Adjustable edge-rate control (ERC) | Hardware-selectable fast/slow B-port transitions allow system-level tuning of data rate vs. overshoot in variable backplane impedance environments |
| TI-OPC™ active overshoot control | Dynamic limiting of low-to-high transition overshoot on unterminated or unevenly loaded backplanes maintains noise margin at >50 MHz |
| OEC™ circuitry | Reduces electromagnetic interference and minimizes bus settling time through optimized output stage design and layout |
| Live-insertion support | Ioff, power-up 3-state, and BIAS VCC collectively prevent current backflow, bus conflicts, and data corruption during card hot-swap in modular systems |
Applications
| IEEE 1394 Backplane PHY Interface | Diagnostics & Control Monitoring |
|---|---|
Use Scenario: Interfacing TI TSB14AA1 1394 backplane physical-layer controller to a parallel backplane in VME/FB+/CPCI chassis. IC Role / Device Role / Timing Role: Translates LVTTL link-layer signals (D0–D1, CTL0–CTL1) to GTLP backplane levels (BPdata, BPstrb) and feeds back strobe/data to host for real-time validation. Use Value: Enables full 1394 S100 (50 MHz) operation with deterministic propagation delay (≤4.2 ns) and ERC-optimized edge rates for minimal jitter on 20-slot backplanes. | Use Scenario: Providing isolated feedback paths from GTLP backplane signals to on-card microcontrollers for runtime diagnostics and fault isolation. IC Role / Device Role / Timing Role: Uses dedicated Y outputs to mirror B-port activity without loading the backplane, supporting non-intrusive monitoring of data/strobe integrity. Use Value: Eliminates need for external buffers or probes; 26-Ω Y-output termination ensures clean signal capture at LVTTL levels for MCU ADC or logic analyzer inputs. |
| Hot-Pluggable Module Control | Multi-Slot Clock Distribution |
Use Scenario: Enabling safe insertion/removal of daughter cards in telecom or industrial backplane systems without powering down the chassis. IC Role / Device Role / Timing Role: Manages B-port I/O precharge via BIAS VCC and disables outputs via Ioff during power sequencing to prevent bus contention. Use Value: Guarantees zero disturbance to active backplane traffic during card swap; meets JESD78 Class II latch-up immunity (>100 mA). | Use Scenario: Distributing primary/secondary clocks (e.g., 25 MHz S50, 50 MHz S100) across multiple slots in a 1394-compliant backplane architecture. IC Role / Device Role / Timing Role: Acts as a dual-channel, polarity-selectable clock buffer with matched A→B and B→Y delays for skew-sensitive timing distribution. Use Value: Achieves ≤0.4 ns inter-channel skew (tsk(HL)) and ≤1.5 ns total skew (tsk(t)), ensuring synchronous clock arrival across 20+ slots. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LVTTL-to-GTLP transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74GTLP2034DWR | Single 4-bit GTLP transceiver; no split LVTTL port or Y feedback outputs; fixed polarity; no ERC pin | Suitable for unidirectional GTLP bus extension only; lacks diagnostics capability and edge-rate tuning | Select when cost-per-bit is critical and feedback monitoring or polarity inversion is unnecessary |
| SN74GTLP1395PWR | Single-channel version; identical pinout and functionality per channel but half the channel count; same ERC, BIAS VCC, and live-insertion features | Used where only one 1-bit path is required (e.g., single strobe line), reducing PCB footprint and BOM count | Select when system requires only one transceiver pair and space/power constraints favor lower channel density |
Compared with SN74GTLP21395DWR, SN74GTLP2034DWR offers higher bit density but sacrifices feedback monitoring and edge-rate control, while SN74GTLP1395PWR provides identical per-channel performance in a smaller footprint but halves channel capacity - choice depends on whether diagnostics, tunability, or channel count dominates the design priority.
Availability
SN74GTLP21395DWR is available at Aetrix Electronics and suitable for IEEE 1394 backplane PHY interfacing, hot-pluggable module control, and multi-slot clock distribution requiring stable component supply across industrial temperature ranges and long-lifecycle programs.
Supply support for SN74GTLP21395DWR 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 90 years of innovation in high-reliability industrial and communications ICs.
The SN74GTLP21395DWR belongs to TI's GTLP family of backplane interface transceivers, engineered specifically for IEEE 1394 backplane physical-layer applications requiring live insertion, adjustable edge rates, and robust signal integrity in distributed-load environments.
FAQ
What is the primary function of the SN74GTLP21395DWR in a backplane system?
The SN74GTLP21395DWR serves as a dual 1-bit bidirectional level translator between 3.3-V LVTTL logic and GTLP backplane signals. It enables IEEE 1394-compliant data and strobe transmission across parallel backplanes while providing isolated LVTTL feedback (Y outputs) for diagnostics. Its TI-OPC™ and OEC™ circuitry ensure signal integrity on unevenly loaded or unterminated traces, and its 100 mA GTLP drive supports incident-wave switching down to 11 Ω loads - making it essential for VME/FB+/CPCI chassis with TI TSB14AA1 PHYs.
How does the ERC pin affect timing performance of the SN74GTLP21395DWR?
The ERC pin on the SN74GTLP21395DWR selects between fast (ERC = L) and slow (ERC = H) edge rates for B-port outputs: fast mode yields 1.3 ns rise / 2.6 ns fall times, slow mode yields 2.5 ns rise / 3.0 ns fall times. This directly impacts propagation delay (A→B: 3.4 ns fast vs. 4.2 ns slow) and signal integrity - fast edges maximize data rate on well-terminated backplanes, while slow edges suppress ringing on lightly loaded or open-slot configurations. ERC voltage must be driven cleanly to avoid metastability.
Can the SN74GTLP21395DWR interface with both GTL and GTLP signaling standards?
Yes, the SN74GTLP21395DWR supports both GTL (VTT = 1.2 V, VREF = 0.8 V) and GTLP (VTT = 1.5 V, VREF = 1.0 V) signal levels, though its AC specifications are guaranteed only for GTLP. The device's input thresholds and output drive are designed to meet JEDEC JESD8-3 for GTL compatibility, and TI application reports SCEA019 and SCEA017 detail implementation guidance for FB+/BTL use cases. For GTL operation, ensure VREF is set to 0.8 V ±0.05 V and verify noise margin margins per system requirements.
What is the role of BIAS VCC in live-insertion support for the SN74GTLP21395DWR?
BIAS VCC on the SN74GTLP21395DWR supplies 3.3 V to precharge and precondition the GTLP B-port I/O pins before main VCC ramps up during card insertion. This prevents transient disturbances on active backplane lines by holding B-port pins at valid logic levels prior to full power-up. TI specifies strict connection sequencing: GND and BIAS VCC first, then I/O, then VCC last. Failure to follow this sequence risks data corruption or bus contention - making BIAS VCC indispensable for true hot-plug capability in modular systems.
Does the SN74GTLP21395DWR require external termination resistors on its Y outputs?
No, the SN74GTLP21395DWR integrates 26-Ω series resistors on all Y outputs (1Y, 2Y), eliminating the need for external termination. These resistors reduce overshoot and undershoot when driving LVTTL loads such as microcontroller inputs or logic analyzers, preserving signal fidelity without additional components. This feature simplifies PCB layout, reduces bill-of-materials cost, and ensures consistent edge behavior across production units - particularly valuable in diagnostics and feedback-path applications where signal integrity is critical.
SN74GTLP21395DWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74GTLP
- Package/Case:
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Translator Type:
- Mixed Signal
- Channel Type:
- Bidirectional
- Number of Circuits:
- 2
- Channels per Circuit:
- 1
- 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:
- 20-SOIC (0.295", 7.50mm Width)
SN74GTLP21395DWR FAQ
1.How can I place an order for SN74GTLP21395DWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74GTLP21395DWR 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 SN74GTLP21395DWR reliable?
The price and inventory of SN74GTLP21395DWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74GTLP21395DWR is usually 5 days.
3.What payment methods are accepted for SN74GTLP21395DWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74GTLP21395DWR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74GTLP21395DWR?
SN74GTLP21395DWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74GTLP21395DWR 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 SN74GTLP21395DWR?
For technical support, including SN74GTLP21395DWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74GTLP21395DWR requirements.
6.How does Aetrix verify that SN74GTLP21395DWR is sourced from the original manufacturer or authorized distributors?
All SN74GTLP21395DWR 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 SN74GTLP21395DWR meets industry standards.
7.What is the process for return or replacement of SN74GTLP21395DWR?
All SN74GTLP21395DWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74GTLP21395DWR, 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 SN74GTLP21395DWR part is unused and in its original packaging.
Return procedure for SN74GTLP21395DWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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