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Texas Instruments SN74GTLP21395DW
- Part No.:
- SN74GTLP21395DW
- Manufacturer:
- Texas Instruments
- Category:
- Translators, Level Shifters
- Package:
- Datasheet:
-
SN74GTLP21395DW.pdf
- Description:
- IC TRANSLTR BIDIRECTIONAL 20SOIC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SN74GTLP21395DW 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 high-drive GTLP outputs (100 mA sink) with integrated 26-Ω series termination on Y outputs. It is used in IEEE 1394 backplane systems for data/strobe transmission between TSB14AA1 PHY and link-layer controllers.
For engineers reviewing the SN74GTLP21395DW datasheet, SN74GTLP21395DW pinout, SN74GTLP21395DW application, or SN74GTLP21395DW equivalent, key selection considerations include GTLP/LVTTL level translation capability, ERC-controlled edge-rate optimization for distributed backplane loads, true/complement polarity selection, split-port feedback for diagnostics, and compliance with JESD 78 Class II latch-up and JESD 22 ESD standards.
Technical Context
The SN74GTLP21395DW implements two independent 1-bit transceivers, each with separate A (LVTTL input), B (GTLP bidirectional I/O), and Y (LVTTL output) ports, plus dedicated OEAB/OEBY and T/C controls per channel. Its TI-OPC™ circuitry actively limits overshoot on unevenly loaded backplanes, while OEC™ improves signal integrity and reduces EMI.
It operates across –40°C to 85°C with VCC = 3.15–3.45 V, supports GTL (VTT = 1.2 V) or GTLP (VTT = 1.5 V) modes, and uses BIAS VCC precharge to enable true live insertion without disturbing active backplane data. The ERC input 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 integrity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Supply Range | 3.15 V to 3.45 V - Ensures stable operation within 3.3-V ±4.5% tolerance for industrial backplane systems. |
| B-Port Output Drive | 100 mA sink - Enables incident-wave switching into heavily loaded backplanes with equivalent impedance down to 11 Ω. |
| LVTTL Output Drive | –12 mA / 12 mA - Compatible with standard LVTTL loads and 5-V-tolerant inputs without level-shifting. |
| Integrated Series Termination | 26-Ω on Y outputs - Eliminates need for external resistors, reducing PCB area and improving signal fidelity. |
| Edge-Rate Control (ERC) | Selects fast (1.3 ns tr / 2.6 ns tf) or slow (2.5 ns tr / 3.0 ns tf) B-port transitions - Optimizes timing margin vs. EMI trade-off per backplane load profile. |
| Live Insertion Support | Ioff < 10 µA at VCC = 0, power-up 3-state, and BIAS VCC precharge - Prevents current backflow and bus disturbance during hot-plug events. |
| Propagation Delay (A→B, Fast) | tPLH/tPHL = 3.8 ns / 3.4 ns - Meets timing budgets for 50-MHz (S100) and 25-MHz (S50) IEEE 1394 backplane data rates. |
Pinout & Package
SN74GTLP21395DW is housed in a 20-pin SOIC (DW) package with 1.27-mm pitch, JEDEC MS-013AC compliant, RoHS-compliant NIPDAU finish, and MSL Level-1 rating (unlimited reflow).
| 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; 12-mA drive capability. |
| 1A, 2A | LVTTL input (A-side) | Accepts 5-V-tolerant LVTTL signals from host controller or link-layer IC; VIH = 2 V min, VIL = 0.8 V max. |
| 1B, 2B | GTLP bidirectional I/O | Connects directly to backplane traces; differential input referenced to VREF; 100-mA sink capability. |
| 1OEAB, 2OEAB | B-port output-enable (active low) | Controls GTLP driver state independently per channel; tied to OCDOE in TSB14AA1 interface. |
| 1OEBY, 2OEBY | Y-output enable (active low) | Enables/disables LVTTL feedback path; typically grounded to maintain continuous receive capability. |
| 1T/C, 2T/C | Polarity control (true/complement) | Selects transparent (T/C = H) or inverted (T/C = L) data flow; used for strobe/data inversion in 1394 PHY interface. |
| ERC | Edge-rate control input | Logic-high selects slow edge rate (reduced EMI); logic-low selects fast edge rate (higher bandwidth). |
| VREF | B-port differential reference | Set to 1 V for GTLP mode; establishes input threshold; must be within 0.6 V of VTT for optimal noise margin. |
| BIAS VCC | Backplane I/O precharge supply | Connected to 3.3 V to precondition B-port pins before VCC ramp-up, enabling true live insertion. |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable edge-rate control (ERC) | Two discrete slew-rate settings (fast/slow) allow system-level optimization of signal integrity vs. data rate without changing layout. |
| Split LVTTL port with feedback path | Dedicated A-input and Y-output per channel enables real-time monitoring of backplane data flow for diagnostics and fault isolation. |
| TI-OPC™ active overshoot suppression | Dynamic clamping on B-port outputs minimizes ringing caused by unterminated slots or uneven card distribution on backplanes. |
| OEC™ circuitry | Reduces electromagnetic interference and shortens bus settling time through optimized output stage design and controlled transition behavior. |
| 5-V tolerant LVTTL interfaces | Allows direct connection to legacy 5-V TTL or CMOS logic without external level shifters, simplifying mixed-voltage system integration. |
Applications
| IEEE 1394 Backplane Data Interface | IEEE 1394 Backplane Strobe Interface |
|---|---|
Use Scenario: Transmitting parallel data bits across a 20-slot VME or CPCI backplane using GTLP signaling between TSB14AA1 PHY and host controller. IC Role / Device Role / Timing Role: LVTTL-to-GTLP transceiver translating D0/D1 signals; provides feedback via Y outputs for protocol validation and error detection. Use Value: Enables deterministic 50-Mbps data transfer with sub-4-ns propagation delay and integrated 26-Ω termination, eliminating external resistors and reducing board space. |
Use Scenario: Routing strobe signals (Tstrb/Rstrb) between 1394 PHY and backplane under live-insertion conditions with zero bus disturbance. IC Role / Device Role / Timing Role: Bidirectional GTLP transceiver with BIAS VCC precharge; ensures glitch-free strobe handshaking during card hot-swap events. Use Value: Maintains signal integrity during dynamic insertion/removal via Ioff shutdown and precharged I/O, meeting IEEE 1394 live-connect requirements. |
| Multi-Slot Diagnostic Monitoring | Primary/Secondary Clock Distribution |
Use Scenario: Providing isolated feedback paths from backplane data lines to on-card microcontrollers for real-time health monitoring of disk drives and power supplies. IC Role / Device Role / Timing Role: Split-port transceiver delivering mirrored LVTTL copies of GTLP data via Y outputs; polarity-selectable for signal inversion as needed. Use Value: Delivers accurate, low-skew (<0.4 ns) diagnostic data without loading the backplane, supporting IPMI-style peripheral supervision. |
Use Scenario: Distributing synchronized clock signals (e.g., SCLK) across multiple daughter cards in a modular test system requiring precise phase alignment. IC Role / Device Role / Timing Role: Low-skew, high-drive GTLP buffer with adjustable edge rate; used for clock forwarding with matched A→B and B→Y delays. Use Value: Achieves <1.5 ns inter-channel skew and <6.6 ns A→Y delay (fast mode), enabling tight timing closure for multi-card synchronization. |
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 |
|---|---|---|---|
| SN74GTLP2203DW | Single 8-bit GTLP transceiver; no split LVTTL port or feedback path; fixed edge rate (no ERC pin). | Suitable for bulk data bus translation only; lacks diagnostic feedback and polarity control required for 1394 PHY interface. | Choose when consolidating multiple data lanes into one device and feedback/diagnostic capability is unnecessary. |
| SN74GTLP1395DW | Single-channel version; identical pinout per channel but half the channel count; same ERC, T/C, and BIAS VCC features. | Used where only one data/strobe pair is needed per slot; requires two devices to match SN74GTLP21395DW's dual-channel functionality. | Prefer when board space allows discrete channel deployment or when redundancy mandates independent channel control. |
Compared with SN74GTLP2203DW and SN74GTLP1395DW, the SN74GTLP21395DW uniquely integrates dual independent channels with split-port feedback, polarity selection, and ERC control-making it the only option qualified for full IEEE 1394 backplane PHY interfacing per TI application notes SCEA017 and SCEA019.
Availability
SN74GTLP21395DW is available at Aetrix Electronics and suitable for IEEE 1394 backplane systems, VME/CPCI modular instrumentation, and industrial live-insertion chassis requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for SN74GTLP21395DW 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 focused on analog, embedded processing, and connectivity technologies, serving industrial, automotive, and communications markets with high-reliability components.
The SN74GTLP21395DW belongs to TI's GTLP family of backplane interface ICs, engineered specifically for robust, high-speed signal translation in IEEE 1394, VME64, and FutureBus+ systems with live-insertion and distributed-load requirements.
FAQ
What is the primary function of the SN74GTLP21395DW in a backplane system?
The SN74GTLP21395DW serves as a dual 1-bit bidirectional level translator between 3.3-V LVTTL logic and GTLP backplane signals. It enables data and strobe transmission between IEEE 1394 link-layer controllers and physical-layer devices like the TSB14AA1, providing true/complement polarity selection, feedback via Y outputs, and adjustable edge-rate control for optimal signal integrity across distributed loads.
How does the ERC pin affect SN74GTLP21395DW performance?
The ERC pin on the SN74GTLP21395DW selects between fast (ERC = L) and slow (ERC = H) B-port edge rates: fast mode yields 1.3 ns rise/2.6 ns fall time, slow mode gives 2.5 ns rise/3.0 ns fall time. This allows designers to tune signal integrity and EMI against data-rate requirements-critical for reliable operation on unevenly loaded backplanes up to 100 Mbps.
Can SN74GTLP21395DW operate with GTL (1.2-V) signaling instead of GTLP (1.5-V)?
Yes, the SN74GTLP21395DW 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 guaranteed for GTLP, but dc parameters remain valid across both modes. Designers must adjust VREF to ~⅔ × VTT and ensure VREF stays within 0.6 V of VTT to maintain noise margin and minimize current drain, per TI application report SCEA019.
What role does BIAS VCC play in SN74GTLP21395DW live-insertion capability?
BIAS VCC on the SN74GTLP21395DW precharges and preconditions the B-port I/O pins before main VCC ramps up. When connected to 3.3 V prior to VCC, it prevents disturbance of active backplane data during card insertion or removal-enabling true live insertion. TI specifies strict sequencing: GND and BIAS VCC first, then I/O, then VCC last, to activate this feature reliably.
Why are the Y outputs of SN74GTLP21395DW internally terminated with 26 Ω?
The Y outputs of the SN74GTLP21395DW integrate 26-Ω series resistors to suppress overshoot and undershoot on LVTTL traces, eliminating the need for external termination. This reduces PCB component count, saves board area, and improves signal fidelity-especially critical in feedback paths used for diagnostics and control monitoring in IEEE 1394 systems.
SN74GTLP21395DW 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:
- 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)
SN74GTLP21395DW FAQ
1.How can I place an order for SN74GTLP21395DW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74GTLP21395DW 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 SN74GTLP21395DW reliable?
The price and inventory of SN74GTLP21395DW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74GTLP21395DW is usually 5 days.
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Once your SN74GTLP21395DW 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 SN74GTLP21395DW?
For technical support, including SN74GTLP21395DW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74GTLP21395DW requirements.
6.How does Aetrix verify that SN74GTLP21395DW is sourced from the original manufacturer or authorized distributors?
All SN74GTLP21395DW 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 SN74GTLP21395DW meets industry standards.
7.What is the process for return or replacement of SN74GTLP21395DW?
All SN74GTLP21395DW units undergo pre-shipment inspection (PSI). If there is an issue with SN74GTLP21395DW, 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 SN74GTLP21395DW part is unused and in its original packaging.
Return procedure for SN74GTLP21395DW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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