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Texas Instruments SN74GTLP21395PWR
- Part No.:
- SN74GTLP21395PWR
- Manufacturer:
- Texas Instruments
- Category:
- Translators, Level Shifters
- Package:
- Datasheet:
-
SN74GTLP21395PWR.pdf
- Description:
- IC TRANSLATOR BIDIR 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,761
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Product details
Overview
SN74GTLP21395PWR 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, power-up 3-state, and BIAS VCC, and delivers 100 mA GTLP drive into distributed backplane loads down to 11 Ω.
For engineers reviewing the SN74GTLP21395PWR datasheet, SN74GTLP21395PWR pinout, SN74GTLP21395PWR application, or SN74GTLP21395PWR equivalent, this device is selected for IEEE 1394 backplane PHY interfacing, high-speed diagnostics monitoring, and hot-pluggable card-level clock/data bridging where edge-rate control, output impedance matching, and LVTTL/GTLP voltage domain isolation are critical.
Technical Context
The SN74GTLP21395PWR implements two independent 1-bit transceivers, each with separate A (LVTTL input), B (GTLP bidirectional I/O), and Y (LVTTL output) terminals, plus dedicated OEAB/OEBY and T/C controls per channel. Its TI-OPC™ circuitry actively suppresses overshoot on unevenly terminated backplanes, while OEC™ improves signal integrity and reduces EMI.
Variable edge-rate control (ERC) 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 varying backplane impedances. The integrated 26-Ω series-equivalent resistance at Y outputs eliminates external termination resistors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Supply | 3.15–3.45 V: Ensures stable operation in 3.3-V systems with ±4.5% tolerance. |
| GTLP Output Drive | 100 mA sink: Enables incident-wave switching on heavily loaded backplanes (Zeq ≥ 11 Ω). |
| LVTTL I/O Drive | ±12 mA: Compatible with standard LVTTL logic families and 5-V-tolerant inputs. |
| B-Port Edge Rate | 1.3–3.0 ns (20%–80%): Adjustable via ERC pin to balance speed and signal integrity. |
| Propagation Delay (A→B) | 3.4–4.3 ns (fast/slow): Measured under GTLP RLC load conditions for real backplane performance. |
| Live Insertion Support | Ioff < 10 µA at VCC = 0 V: Prevents backflow current during hot-swap events. |
| Y-Output Series Resistance | 26 Ω (integrated): Eliminates need for external series termination resistors. |
Pinout & Package
TSSOP-20 (PW) package: 6.5 mm × 4.4 mm, 0.65 mm pitch, thermally enhanced with exposed pad (not electrically connected). Pin 1 marked by beveled corner; top-side marking "GU395".
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1Y, 2Y | LVTTL output (feedback path) | Provides isolated LVTTL-level echo of B-port data for diagnostics and control monitoring. |
| 1A, 2A | LVTTL input (A-port) | Accepts 3.3-V LVTTL or 5-V-tolerant signals from host controller or link-layer logic. |
| 1B, 2B | GTLP bidirectional I/O | Connects directly to backplane traces; requires VTT = 1.5 V and VREF = 1 V reference. |
| 1OEAB, 2OEAB | GTLP output-enable (active low) | Controls B-port driver state; tied to PHY OCDOE for coordinated transmit enable. |
| 1OEBY, 2OEBY | LVTTL output-enable (active low) | Typically grounded to maintain continuous Y-path monitoring of backplane activity. |
| 1T/C, 2T/C | Polarity select (true/complement) | Configures data inversion: high = true mode (A→B, B→Y); low = inverted mode. |
| ERC | Edge-rate control input | High = slow edges (2.5/3.0 ns); low = fast edges (1.3/2.6 ns) for tuning signal integrity. |
| VREF | GTLP differential input reference | Set to 1 V for GTLP; establishes noise margin and threshold for B-port receivers. |
| BIAS VCC | Backplane precharge supply | 3.3 V input that preconditions B-port I/O before VCC ramp-up, enabling true live insertion. |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable edge-rate control (ERC) | Two discrete slew rates (fast/slow) optimized for distributed backplane RLC loads without layout changes. |
| Integrated 26-Ω series resistance at Y outputs | Eliminates external termination components and reduces PCB area/cost for feedback path routing. |
| Split LVTTL port (A/Y) | Enables simultaneous transmission (A→B) and local monitoring (B→Y) without additional buffers or logic. |
| TI-OPC™ active overshoot suppression | Maintains signal integrity on unterminated or slot-varying backplanes, preserving noise margin at 100 Mbps. |
| Live-insertion support (Ioff, power-up 3-state, BIAS VCC) | Prevents bus contention, backfeed, and data corruption during hot-swap of daughter cards in modular systems. |
Applications
| IEEE 1394 Backplane PHY Interface | Diagnostics & Control Monitoring |
|---|---|
|
Use Scenario: Interfacing TSB14AA1 or similar 1394 backplane PHY controllers to LVTTL host logic across a parallel backplane. IC Role / Device Role / Timing Role: Translates LVTTL data/strobe signals to GTLP levels for backplane transmission and echoes GTLP return signals to LVTTL for host visibility. Use Value: Enables full-duplex 25/50/100-Mbps 1394 backplane operation with deterministic latency (≤4.3 ns A→B) and no external termination. |
Use Scenario: Real-time observation of backplane traffic for system health monitoring, fault isolation, and firmware debug in telecom or industrial chassis. IC Role / Device Role / Timing Role: Provides isolated, non-intrusive LVTTL feedback path (B→Y) synchronized to GTLP data flow without loading the backplane. Use Value: Delivers sub-7-ns A→Y propagation delay with built-in 26-Ω output impedance, eliminating probe-induced signal distortion. |
| Hot-Pluggable Card-Level Clock Distribution | Multi-Slot Parallel Backplane Control Bus |
|
Use Scenario: Distributing primary/secondary clocks (e.g., S100/S50) across a VME/FB+/CPCI backplane with live insertion capability. IC Role / Device Role / Timing Role: Buffers and level-shifts LVTTL clock signals to GTLP for robust backplane delivery while supporting dynamic card addition/removal. Use Value: Maintains <1.5 ns inter-channel skew (A→B) and supports 100-Mbps timing margins even with ERC set for slow edges. |
Use Scenario: Implementing auxiliary 2-bit control buses (e.g., CSR access, reset coordination) across multi-slot backplane systems requiring plug-and-play configuration. IC Role / Device Role / Timing Role: Acts as a dual-channel, polarity-selectable transceiver for bidirectional control signaling between slot controller and peripheral modules. Use Value: Offers true/inverted data modes per channel (via T/C) and independent OE control, enabling flexible protocol encoding without FPGA logic overhead. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LVTTL-to-GTLP bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74GTLP2207PWR | Single 8-bit transceiver; no split A/Y port or feedback path; fixed edge rate; no ERC pin. | Suitable for bulk data transfer only; lacks diagnostic monitoring capability and polarity selection per bit. | Select when high-density unidirectional data bridging is required and feedback monitoring is unnecessary. |
| SN74GTLP1395PWR | Single-channel version; identical pinout per channel but half the channel count; same ERC, T/C, and BIAS VCC features. | Used where only one 1-bit path is needed (e.g., strobe-only or clock-only interface), reducing component count. | Select to minimize BOM cost and PCB footprint when dual-channel functionality is not required. |
Compared with SN74GTLP2207PWR and SN74GTLP1395PWR, the SN74GTLP21395PWR uniquely combines dual independent channels, split LVTTL feedback (A/Y), per-channel polarity control (T/C), and adjustable edge-rate (ERC) - making it the only option for IEEE 1394 PHY interfaces requiring concurrent data + strobe translation with real-time monitoring.
Availability
SN74GTLP21395PWR is available at Aetrix Electronics and suitable for IEEE 1394 backplane PHY interfacing, hot-pluggable card diagnostics, and multi-slot control bus applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for SN74GTLP21395PWR 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 SN74GTLP21395PWR belongs to TI's GTLP family of backplane transceivers, designed specifically for robust, high-speed signal translation in IEEE 1394, VME, FB+, and CPCI systems requiring live insertion and distributed-load optimization.
FAQ
What is the primary function of the SN74GTLP21395PWR in a backplane system?
The SN74GTLP21395PWR serves as a dual 1-bit bidirectional level translator between LVTTL logic domains (host side) and GTLP signal domains (backplane side). It enables high-speed data and strobe transmission while providing an isolated LVTTL feedback path (via Y outputs) for diagnostics and control monitoring - a core requirement for IEEE 1394 backplane PHY implementations such as those using the TSB14AA1 controller. Its design ensures compatibility with 25/50/100-Mbps backplane operation.
How does the ERC pin affect signal integrity in the SN74GTLP21395PWR?
The ERC (Edge-Rate Control) pin on the SN74GTLP21395PWR selects between two discrete B-port output slew rates: ERC = L yields fast edges (1.3 ns rise / 2.6 ns fall), while ERC = H yields slow edges (2.5 ns rise / 3.0 ns fall). This adjustment allows designers to optimize trade-offs between data-transfer rate and signal integrity on real-world distributed backplane loads - minimizing ringing and overshoot without requiring external RC networks or layout revisions. The SN74GTLP21395PWR's TI-OPC™ circuitry further enhances this behavior by actively suppressing overshoot during low-to-high transitions.
Can the SN74GTLP21395PWR be used in GTL-mode applications (VTT = 1.2 V, VREF = 0.8 V)?
Yes, the SN74GTLP21395PWR supports both GTL (VTT = 1.2 V, VREF = 0.8 V) and GTLP (VTT = 1.5 V, VREF = 1.0 V) operating points, though its AC specifications are guaranteed only at GTLP. When used in GTL mode, designers must verify noise margins and timing margins against system requirements, particularly for 100-Mbps operation. The device's input thresholds and output drive strength remain functional across both standards, and TI application reports SCEA019 and SCEA017 provide guidance for GTLP-in-BTL and GTL interoperability.
What is the role of the BIAS VCC pin in the SN74GTLP21395PWR, and how should it be connected?
The BIAS VCC pin on the SN74GTLP21395PWR supplies precharge voltage to the B-port I/O circuitry, enabling true live insertion by preconditioning backplane connections before main VCC ramps up. It must be connected to a stable 3.3-V supply - same as VCC - and powered *before* VCC during card insertion. TI specifies strict sequencing: GND and BIAS VCC first, then B-port I/O, then VCC last. Failure to follow this sequence may cause transient disturbances on active backplane data lines. The SN74GTLP21395PWR's BIAS VCC circuitry draws ≤10 µA when inactive and up to 5 mA during precharge.
Does the SN74GTLP21395PWR require external termination resistors on its Y outputs?
No, the SN74GTLP21395PWR integrates a 26-Ω series-equivalent resistance at each Y output, explicitly designed to match typical PCB trace impedances and suppress overshoot/undershoot. This eliminates the need for external series termination resistors on the LVTTL feedback path - simplifying layout, reducing BOM count, and improving signal fidelity for diagnostic monitoring. The value is process-trimmed and temperature-compensated, ensuring consistent performance across –40°C to 85°C operation without calibration.
SN74GTLP21395PWR 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:
- 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-TSSOP (0.173", 4.40mm Width)
SN74GTLP21395PWR FAQ
1.How can I place an order for SN74GTLP21395PWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74GTLP21395PWR 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 SN74GTLP21395PWR reliable?
The price and inventory of SN74GTLP21395PWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74GTLP21395PWR is usually 5 days.
3.What payment methods are accepted for SN74GTLP21395PWR?
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4.How is shipping managed for SN74GTLP21395PWR?
SN74GTLP21395PWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74GTLP21395PWR 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 SN74GTLP21395PWR?
For technical support, including SN74GTLP21395PWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74GTLP21395PWR requirements.
6.How does Aetrix verify that SN74GTLP21395PWR is sourced from the original manufacturer or authorized distributors?
All SN74GTLP21395PWR 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 SN74GTLP21395PWR meets industry standards.
7.What is the process for return or replacement of SN74GTLP21395PWR?
All SN74GTLP21395PWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74GTLP21395PWR, 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 SN74GTLP21395PWR part is unused and in its original packaging.
Return procedure for SN74GTLP21395PWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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