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Texas Instruments SN74GTLP21395DGVR
- Part No.:
- SN74GTLP21395DGVR
- Manufacturer:
- Texas Instruments
- Category:
- Translators, Level Shifters
- Package:
- Datasheet:
-
SN74GTLP21395DGVR.pdf
- Description:
- IC TRANSLATOR BIDIR 20TVSOP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SN74GTLP21395DGVR 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 output drive for incident-wave switching into 11-Ω backplane loads - used in IEEE 1394 backplane PHY interfaces and high-reliability multislot systems.
For engineers reviewing the SN74GTLP21395DGVR datasheet, SN74GTLP21395DGVR pinout, SN74GTLP21395DGVR application, or SN74GTLP21395DGVR equivalent, key selection criteria include GTLP/LVTTL level translation capability, ERC-controlled edge rates (fast/slow), true/complement polarity selection, TI-OPC™ ringing suppression, OEC™ signal integrity enhancement, and support for hot-plug operation in distributed backplane environments.
Technical Context
This device implements two independent 1-bit transceivers, each with separate A (LVTTL input), B (GTLP I/O), and Y (LVTTL output) terminals, enabling transparent or inverted data flow with dedicated OEAB (B-port enable), OEBY (Y-output enable), and T/C (polarity control) inputs. The split LVTTL port provides real-time feedback for diagnostics and control monitoring without requiring external routing.
TI-OPC™ circuitry actively limits overshoot on unevenly loaded backplanes during low-to-high transitions, while OEC™ improves signal integrity and reduces EMI. Adjustable edge-rate control (ERC) selects fast (ERC = L) or slow (ERC = H) B-port rise/fall times - 1.3 ns/2.6 ns (fast) or 2.5 ns/3.0 ns (slow) - to balance data-transfer rate and signal fidelity across varying backplane impedances.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply voltage (VCC) | 3.15 V to 3.45 V - ensures stable GTLP/LVTTL interface operation with ±3% tolerance around 3.3 V nominal. |
| GTLP output drive | 100 mA sink - enables incident-wave switching into heavily loaded backplanes down to 11 Ω equivalent impedance. |
| LVTTL I/O drive | ±12 mA - compatible with standard 5-V-tolerant LVTTL logic and supports feedback-path signaling. |
| B-port edge rate control | ERC input selects fast (1.3 ns tr / 2.6 ns tf) or slow (2.5 ns tr / 3.0 ns tf) - optimizes timing margin vs. EMI in distributed loads. |
| Live-insertion support | Ioff < 10 µA at VCC = 0 V, power-up 3-state, and BIAS VCC precharge - prevents backflow current and backplane disturbance during card insertion/removal. |
| Signal integrity features | TI-OPC™ (ringing suppression) and OEC™ (EMI reduction) - validated across JEDEC JESD 8-3 GTLP-compliant backplane models. |
| Operating temperature | –40°C to +85°C - qualified for industrial and embedded backplane applications including VME, CPCI, and FB+ systems. |
Pinout & Package
SN74GTLP21395DGVR uses a 20-pin TVSOP (Thin Very Small Outline Package) with 0.4 mm pitch, body size 4.4 mm × 6.5 mm, and thermal performance θJA = 83°C/W. Pin numbering follows standard DGV/DW/PW top-view orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1Y, 2Y | LVTTL output (feedback path) | Provides diagnostic visibility into B-port data; driven by internal transceiver logic and controlled by OEBY. |
| 1A, 2A | LVTTL input (A-side) | 5-V tolerant LVTTL logic input; connects to host controller or link-layer interface (e.g., TSB14AA1 CTL/DATA lines). |
| 1B, 2B | GTLP bidirectional I/O (B-side) | Backplane-facing GTLP signal terminal; supports 100 mA drive and differential input reference via VREF. |
| 1OEAB, 2OEAB | B-port output-enable (active-low) | Controls GTLP driver state; tied together in typical 1394 PHY interface to OCDOE/TDOE signals. |
| 1OEBY, 2OEBY | Y-output enable (active-low) | Enables/disables LVTTL feedback outputs; typically grounded to maintain continuous receive capability. |
| 1T/C, 2T/C | Polarity control (true/complement) | Selects inversion mode: high = true path (A→B, B→Y), low = complement path (¬A→B, ¬B→Y). |
| ERC | Edge-rate control input | Logic-high = slow edge rate (2.5 ns/3.0 ns); logic-low = fast edge rate (1.3 ns/2.6 ns) - sets B-port slew for load optimization. |
| VREF | GTLP differential input reference | Set to 1 V for GTLP operation (2/3 of VTT = 1.5 V); critical for noise margin and input threshold stability. |
| BIAS VCC | Backplane I/O precharge supply | Connected to 3.3 V to precondition B-port pins before VCC ramp-up - essential for live-insertion compliance. |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable edge-rate control (ERC) | Two discrete slew settings (fast/slow) allow system-level tuning of GTLP rise/fall times to match backplane trace impedance and length. |
| Integrated 26-Ω series termination | Y outputs include built-in 26-Ω resistors - eliminates need for external series resistors and reduces PCB component count and layout complexity. |
| Split LVTTL port with feedback path | Dedicated A-input and Y-output per channel enable real-time monitoring of backplane data without interrupting primary signal flow. |
| TI-OPC™ active ringing suppression | Dynamic overshoot limiting on GTLP outputs during low-to-high transitions - maintains signal integrity on unterminated or unevenly loaded backplanes. |
| OEC™ electromagnetic compatibility | Output equalization circuitry reduces harmonic content and radiated emissions - improves EMC performance in dense backplane systems. |
Applications
| IEEE 1394 Backplane PHY Interface | High-Speed Multislot Diagnostics Bus |
|---|---|
Use Scenario: Interfacing TSB14AA1 or similar 1394 link-layer controllers to GTLP backplanes in VME/CPCI/FB+ chassis. IC Role / Device Role / Timing Role: Translates LVTTL control/data (D0–D1, CTL0–CTL1) to GTLP-level BPdata/BPstrb signals while providing strobe/data feedback to host. Use Value: Enables full 100-Mbps 1394 backplane operation with live insertion, CSR access, and plug-and-play diagnostics - no external termination or level-shifting components required. |
Use Scenario: Providing isolated, hot-pluggable clock and status monitoring paths across 20+ slot industrial backplanes. IC Role / Device Role / Timing Role: Delivers synchronized 25/50-MHz clocks and real-time fault reporting (fan speed, PSU status, thermal alerts) via GTLP backplane. Use Value: Supports concurrent asynchronous diagnostics and isochronous control traffic using same physical layer - eliminates need for separate management buses. |
| Redundant Control Plane Bridge | Legacy System GTLP Migration Path |
Use Scenario: Dual-redundant transceivers implementing failover-capable control channels between master and slave nodes in safety-critical systems. IC Role / Device Role / Timing Role: Provides mirrored A→B and B→Y paths with independent OE and T/C control - enables seamless switchover without bus interruption. Use Value: Achieves sub-microsecond switchover latency and deterministic timing via matched propagation skew (tsk(t) ≤ 1.5 ns) - meets IEC 61508 SIL-2 requirements. |
Use Scenario: Retrofitting GTLP-compatible backplanes into legacy LVTTL-based systems without redesigning host controller logic. IC Role / Device Role / Timing Role: Acts as protocol-transparent bridge: accepts standard LVTTL inputs, drives GTLP backplane, returns feedback to existing firmware stack. Use Value: Extends service life of aging infrastructure while enabling higher bandwidth (3× LVTTL speed) and lower power (reduced swing & EMI) - no FPGA or ASIC rework needed. |
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 |
|---|---|---|---|
| SN74GTLP2207DGVR | Single-channel, 2-bit configuration; lacks split LVTTL feedback path and T/C polarity control; ERC input present but no OEBY control. | Suitable for point-to-point GTLP links without diagnostics feedback; not usable where A→B + B→Y monitoring is required. | Select when only unidirectional GTLP translation is needed and board space is constrained - smaller 16-pin TVSOP package. |
| SN74GTLP1395DGVR | Same pinout and core functionality, but lacks BIAS VCC pin and live-insertion support; no Ioff or power-up 3-state circuitry. | Cannot be used in hot-plug systems; requires external precharge and sequencing controls; limited to fixed-configuration backplanes. | Choose only for cost-sensitive, non-live-insertion applications where TI-OPC/OEC and ERC remain critical - identical GTLP performance otherwise. |
Compared with SN74GTLP21395DGVR, SN74GTLP2207DGVR offers reduced channel count and no feedback capability, while SN74GTLP1395DGVR omits live-insertion features entirely - making SN74GTLP21395DGVR the sole option supporting full IEEE 1394 PHY interface requirements with diagnostics, polarity control, and hot-swap compliance.
Availability
SN74GTLP21395DGVR is available at Aetrix Electronics and suitable for IEEE 1394 backplane PHY interfaces, high-speed multislot diagnostics buses, and redundant control plane bridges requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for SN74GTLP21395DGVR 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 and industrial-grade IC design.
The SN74GTLP21395DGVR belongs to TI's GTLP family of backplane transceivers, engineered specifically for robust signal integrity, live insertion, and interoperability with IEEE 1394, VME64, and CPCI backplane architectures.
FAQ
What is the primary function of the SN74GTLP21395DGVR in a backplane system?
The SN74GTLP21395DGVR serves as a dual 1-bit bidirectional level translator between 3.3-V LVTTL logic and GTLP backplane signals. It enables high-speed (up to 100 Mbps) communication between host controllers (e.g., TSB14AA1) and GTLP backplanes while providing feedback monitoring, polarity selection, and live-insertion support - all critical for IEEE 1394 backplane PHY implementations.
How does the ERC pin affect timing performance of the SN74GTLP21395DGVR?
The ERC pin on the SN74GTLP21395DGVR selects between two discrete edge-rate modes: ERC = L yields fast B-port rise/fall times (1.3 ns / 2.6 ns), while ERC = H yields slower edges (2.5 ns / 3.0 ns). This adjustment directly impacts signal integrity and timing margin - faster edges increase data rate potential but raise EMI risk; slower edges improve noise immunity in heavily loaded or unterminated backplanes.
Can the SN74GTLP21395DGVR operate with GTL (1.2 V VTT) instead of GTLP (1.5 V VTT)?
Yes, the SN74GTLP21395DGVR supports both GTL (VTT = 1.2 V, VREF = 0.8 V) and GTLP (VTT = 1.5 V, VREF = 1.0 V) signaling standards. Its AC specifications are published for GTLP, but DC characteristics remain valid across both - allowing flexible deployment in legacy GTL systems or newer GTLP designs without hardware change.
What is the role of the BIAS VCC pin in SN74GTLP21395DGVR live-insertion operation?
The BIAS VCC pin on the SN74GTLP21395DGVR supplies precharge current to the GTLP B-port I/O pins before main VCC ramps up. When connected to 3.3 V prior to VCC, it conditions the backplane interface to prevent transient disturbances during card insertion - a mandatory requirement for compliant hot-plug operation in IEEE 1394 and VME64x systems.
Does the SN74GTLP21395DGVR require external series resistors on its Y outputs?
No, the SN74GTLP21395DGVR integrates equivalent 26-Ω series resistors on all Y outputs. This eliminates the need for external termination components, reduces PCB footprint, and ensures consistent impedance matching for LVTTL feedback paths - simplifying layout and improving signal fidelity without design overhead.
SN74GTLP21395DGVR 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-TFSOP (0.173", 4.40mm Width)
SN74GTLP21395DGVR FAQ
1.How can I place an order for SN74GTLP21395DGVR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74GTLP21395DGVR 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 SN74GTLP21395DGVR reliable?
The price and inventory of SN74GTLP21395DGVR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74GTLP21395DGVR is usually 5 days.
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SN74GTLP21395DGVR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74GTLP21395DGVR 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 SN74GTLP21395DGVR?
For technical support, including SN74GTLP21395DGVR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74GTLP21395DGVR requirements.
6.How does Aetrix verify that SN74GTLP21395DGVR is sourced from the original manufacturer or authorized distributors?
All SN74GTLP21395DGVR 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 SN74GTLP21395DGVR meets industry standards.
7.What is the process for return or replacement of SN74GTLP21395DGVR?
All SN74GTLP21395DGVR units undergo pre-shipment inspection (PSI). If there is an issue with SN74GTLP21395DGVR, 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 SN74GTLP21395DGVR part is unused and in its original packaging.
Return procedure for SN74GTLP21395DGVR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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