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Texas Instruments TPD4S1394DQLR
- Part No.:
- TPD4S1394DQLR
- Manufacturer:
- Texas Instruments
- Category:
- Mixed Technology
- Package:
- 8-XFDFN
- Datasheet:
-
TPD4S1394DQLR.pdf
- Description:
- TVS DEVICE MIXED 2.45V 8-X2SON
- Quantity:
- Payment:
- Shipping:
Inventory:5,639
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Product details
Overview
TPD4S1394DQLR from Texas Instruments is an IEEE 1394 (FireWire) interface ESD protection and live-insertion detection IC. It integrates four high-speed ESD clamps for D1+/D1– and D2+/D2– differential pairs, delivers ±6-kV IEC 61000-4-2 contact discharge protection, features a 1.5–2.0 pF I/O capacitance per data line, operates from 3.0 V to 3.6 V, and provides FWPWR_EN control output with 0.5–5 µs trip delay for FireWire port power management in notebook docking stations.
For engineers reviewing the TPD4S1394DQLR datasheet, TPD4S1394DQLR pinout, TPD4S1394DQLR application, or TPD4S1394DQLR equivalent, key selection criteria include live-insertion detection timing (tTRIP/tRESET), low-capacitance ESD clamping for 400-MHz/800-Mbps FireWire signaling, X2SON-8 package layout compatibility, and compliance with IEC 61000-4-2 Level 4 and ±15-kV HBM standards.
Technical Context
The TPD4S1394DQLR implements dual-differential-channel ESD protection using low-capacitance silicon diode clamps tied to VCC and GND, with VCLMP (pin 3) providing a 2.45-V internal reference for comparator-based live-insertion detection. Its architecture isolates signal integrity by maintaining <2 pF loading on D1+/D1– and D2+/D2– pins while enabling robust fault response.
Live-insertion detection relies on voltage monitoring of D+/D– lines against VCLMP: floating GND or high-level signals trigger FWPWR_EN (pin 4) to assert low within ≤5 µs, initiating a 300–600 ms reset delay before re-enabling power. The device requires a 0.1-µF decoupling capacitor at VCC (pin 1) and operates across –40°C to +85°C ambient temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| ESD Protection | ±6-kV IEC 61000-4-2 contact discharge on D1+/D1–/D2+/D2– pins - ensures system-level survivability during real-world connector hot-plug events |
| I/O Capacitance | 1.5–2.0 pF at 2.5 V bias - preserves signal integrity for FireWire 400 (800 Mbps) without degrading rise/fall times or insertion loss |
| FWPWR_EN Trip Voltage | 2.7–3.8 V low-to-high / 2.9–4.0 V high-to-low - defines precise comparator threshold for reliable live-insertion detection under varying line conditions |
| Dynamic Resistance | 1 Ω (at 1 A) - minimizes clamping voltage overshoot during ESD transients, protecting downstream PHY circuitry |
| Supply Voltage Range | 3.0 V to 3.6 V - matches standard 3.3-V logic rails and ensures stable operation of internal comparators and clamp biasing |
| Operating Temperature | –40°C to +85°C - supports industrial and consumer portable applications including docking stations and external storage interfaces |
| Package | X2SON-8 (2.00 mm × 1.40 mm) - ultra-compact footprint enables placement directly adjacent to FireWire connectors to minimize stub length and EMI coupling |
Pinout & Package
X2SON-8 (DQL) package: 2.00 mm × 1.40 mm body, 0.5-mm pitch, bottom-side thermal pad, moisture sensitivity level 1 (260°C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC (Pin 1) | Power supply input | Supplies internal comparator and clamp bias circuits; requires 0.1-µF decoupling capacitor to stabilize reference and reduce noise-induced false trips |
| GND (Pin 2) | Ground reference | Common return path for ESD current and comparator ground; must be connected to low-impedance system ground plane |
| VCLMP (Pin 3) | Comparator reference output | Provides fixed 2.45-V internal reference for live-insertion detection; no external connection required |
| FWPWR_EN (Pin 4) | Live-insertion control output | Open-drain output that drives external FireWire port power switch low during fault; includes 300–600 ms reset delay before auto-recovery |
| D2– (Pin 5) | Differential data input (channel 2, negative) | High-speed ESD clamp input; paired with D2+ for FireWire beta-mode or second-link protection |
| D2+ (Pin 6) | Differential data input (channel 2, positive) | High-speed ESD clamp input; matched to D2– for common-mode rejection and minimal skew |
| D1– (Pin 7) | Differential data input (channel 1, negative) | Primary FireWire 400 data line clamp; low 1.5–2.0 pF capacitance prevents signal degradation at 400 MHz |
| D1+ (Pin 8) | Differential data input (channel 1, positive) | Primary FireWire 400 data line clamp; flow-through pin mapping simplifies PCB routing and maintains differential pair symmetry |
Key Features
| Feature | Design Value |
|---|---|
| IEEE 1394 live-insertion detection | Monitors D+/D– voltage states in real time and asserts FWPWR_EN low within ≤5 µs to disable port power before damage occurs |
| 4-channel matching ESD clamps | Ensures identical capacitance (<2 pF), dynamic resistance (1 Ω), and clamping voltage across all four data lines for balanced differential signaling |
| Flow-through, single-in-line pin mapping | Aligns D1+/D1– and D2+/D2– pins linearly (pins 8–5), enabling straight trace routing from connector to IC and minimizing crosstalk |
| IEC 61000-4-2 Level 4 compliance | Validated for ±6-kV contact discharge on interface pins - exceeds industrial ESD immunity requirements for external ports |
| X2SON-8 ultra-small package | 2.0 mm × 1.4 mm footprint places ESD protection directly at the connector, reducing unprotected trace length and EMI susceptibility |
Applications
| FireWire 400 Notebook Docking | External FireWire Storage Interface |
|---|---|
|
Use Scenario: Hot-plugging FireWire peripherals into laptop docking stations where uncontrolled voltage transients may occur during mating. IC Role / Device Role / Timing Role: ESD protector and live-insertion detector that monitors D1+/D1– lines and disables port power via FWPWR_EN before transient energy reaches the host controller. Use Value: Prevents latch-up or permanent damage to the FireWire PHY during misaligned or partial connector insertion, extending system reliability. |
Use Scenario: Connecting FireWire-enabled hard drives or video capture devices to desktop PCs with exposed rear-panel ports. IC Role / Device Role / Timing Role: Dual-channel ESD clamp for both D1 and D2 differential pairs, with independent live-insertion detection per channel. Use Value: Enables safe hot-swap operation without requiring user to power down the host, while maintaining signal fidelity up to 800 Mbps. |
| FireWire Beta-Mode Video Equipment | Legacy Audio/Video Editing Workstations |
|
Use Scenario: High-bandwidth FireWire beta-mode (2.4 Gbps) connections between digital camcorders and non-linear editing systems. IC Role / Device Role / Timing Role: Low-capacitance (1.5–2.0 pF) ESD clamp preserving signal integrity at >2 GHz bandwidth, verified by –3 dB insertion loss at 2.4 GHz. Use Value: Maintains eye diagram margin and jitter performance while providing ±6-kV ESD immunity on both data lanes. |
Use Scenario: Retrofitting ESD protection onto aging professional audio/video workstations with legacy FireWire 400 interfaces. IC Role / Device Role / Timing Role: Drop-in replacement for discrete TVS solutions, integrating clamping and intelligent power control in one X2SON-8 device. Use Value: Reduces BOM count and PCB area versus discrete diode + comparator implementations, accelerating redesign cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar FireWire ESD protection and live-insertion detection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPD2EUSB30DRYR | Designed for USB 3.0 (5 Gbps); lacks live-insertion detection circuit and FWPWR_EN output; lower 0.7-pF I/O capacitance | Supports SuperSpeed USB only; not IEEE 1394 compliant; no power-switch control capability | Select only for USB 3.0 interfaces requiring higher bandwidth and no live-insertion logic |
| TPD6S300ARGER | 6-channel solution for HDMI/USB 2.0; includes integrated VBUS switch control but no FireWire-specific comparator thresholds or D+/D– pin mapping | Targeted at multi-interface ports (HDMI + USB); does not support FireWire differential signaling structure or timing requirements | Choose when consolidating protection across multiple interface types on a single board, not for dedicated FireWire designs |
Compared with TPD4S1394DQLR, TPD2EUSB30DRYR offers superior bandwidth and lower capacitance but omits critical FireWire-specific live-insertion logic, while TPD6S300ARGER provides broader interface coverage at the cost of FireWire-optimized pinout, voltage thresholds, and trip timing - making TPD4S1394DQLR uniquely suited for IEEE 1394-compliant systems requiring both ESD resilience and intelligent port power control.
Availability
TPD4S1394DQLR is available at Aetrix Electronics and suitable for FireWire 400 docking stations, external storage interfaces, and legacy AV editing workstations requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant sourcing.
Supply support for TPD4S1394DQLR 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 company delivering analog and embedded processing solutions, with leadership in interface protection, precision analog, and power management ICs.
The TPD4S1394DQLR belongs to TI's interface ESD protection product line, engineered specifically for IEEE 1394 (FireWire) systems requiring integrated live-insertion detection and high-fidelity signal preservation at 400 Mbps and beyond.
FAQ
What is the primary function of the TPD4S1394DQLR in a FireWire interface design?
The TPD4S1394DQLR serves two core functions: first, it provides bidirectional ESD protection for four high-speed differential lines (D1+/D1– and D2+/D2–) with <2 pF capacitance to preserve signal integrity; second, it implements live-insertion detection using internal comparators to monitor D+/D– voltage levels and assert the FWPWR_EN output low within ≤5 µs to disable external port power during unsafe connector mating - a critical feature unique to the TPD4S1394DQLR among TI's interface protection portfolio.
Does the TPD4S1394DQLR require external components for basic operation?
Yes, the TPD4S1394DQLR requires a 0.1-µF ceramic decoupling capacitor connected between VCC (pin 1) and GND (pin 2) to stabilize the internal reference and prevent false triggering of the live-insertion detection circuit. No pull-up or pull-down resistors are needed on FWPWR_EN (pin 4), as it is an open-drain output designed to interface directly with standard FireWire port power switches. All other pins are self-contained and require no additional passive components for nominal operation.
How does the TPD4S1394DQLR differ from generic ESD protection diodes like SMAJ or PGB series?
Unlike discrete TVS diodes, the TPD4S1394DQLR integrates both ESD clamping and intelligent system-level functionality: its live-insertion detection circuit actively monitors D+/D– voltage states and controls external power via FWPWR_EN, whereas generic diodes only provide passive clamping. It also delivers matched 1.5–2.0 pF capacitance across all four data lines - far lower than typical discrete solutions - and uses flow-through pin mapping optimized for FireWire differential pair routing, which discrete diodes cannot replicate in a single package.
What is the significance of the VCLMP pin (pin 3) on the TPD4S1394DQLR?
VCLMP (pin 3) is the internal comparator reference output of the TPD4S1394DQLR, providing a fixed 2.45-V voltage used by the live-insertion detection circuit to evaluate D+/D– line states. This pin is not an input and requires no external connection - it is internally generated and buffered. Its precise value establishes the trip threshold for detecting floating grounds or improper signal levels during connector insertion, ensuring consistent and repeatable FWPWR_EN assertion without calibration or external feedback.
Can the TPD4S1394DQLR be used for FireWire 800 (S800) interfaces operating at 800 Mbps?
No, the TPD4S1394DQLR is specified and characterized for FireWire 400 (400 Mbps) applications only. While its –3 dB insertion loss occurs at 2.4 GHz - suggesting theoretical suitability for higher frequencies - the device's live-insertion detection logic, pin mapping, and electrical specifications (e.g., FWPWR_EN timing, trip voltage ranges) are explicitly validated for IEEE 1394a-2000 (FireWire 400) compliance per the official datasheet. FireWire 800 (IEEE 1394b) uses different physical layer signaling and is not supported by the TPD4S1394DQLR.
TPD4S1394DQLR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 8-XFDFN
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Clamping:
- 2.45V
- Technology:
- Mixed Technology
- Number of Circuits:
- 4
- Applications:
- FireWire®
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-X2SON (2x1.4)
TPD4S1394DQLR FAQ
1.How can I place an order for TPD4S1394DQLR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPD4S1394DQLR 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 TPD4S1394DQLR reliable?
The price and inventory of TPD4S1394DQLR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPD4S1394DQLR is usually 5 days.
3.What payment methods are accepted for TPD4S1394DQLR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPD4S1394DQLR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPD4S1394DQLR?
TPD4S1394DQLR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPD4S1394DQLR 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 TPD4S1394DQLR?
For technical support, including TPD4S1394DQLR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPD4S1394DQLR requirements.
6.How does Aetrix verify that TPD4S1394DQLR is sourced from the original manufacturer or authorized distributors?
All TPD4S1394DQLR 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 TPD4S1394DQLR meets industry standards.
7.What is the process for return or replacement of TPD4S1394DQLR?
All TPD4S1394DQLR units undergo pre-shipment inspection (PSI). If there is an issue with TPD4S1394DQLR, 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 TPD4S1394DQLR part is unused and in its original packaging.
Return procedure for TPD4S1394DQLR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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