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Texas Instruments SN74GTLPH3245ZKFR
- Part No.:
- SN74GTLPH3245ZKFR
- Manufacturer:
- Texas Instruments
- Category:
- Translators, Level Shifters
- Package:
- Datasheet:
-
SN74GTLPH3245ZKFR.pdf
- Description:
- IC TRANSLTR BIDIRECTIONAL 114BGA
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SN74GTLPH3245ZKFR from Texas Instruments is a 32-bit LVTTL-to-GTLP bidirectional bus transceiver with adjustable edge-rate control (ERC), high-drive GTLP outputs (100 mA), 5-V-tolerant LVTTL inputs, and live-insertion support via Ioff, power-up 3-state, and BIAS VCC. It operates at 3.3-V supply with GTLP termination at 1.5 V and VREF at 1 V, enabling high-speed backplane communication in telecom rack systems.
For engineers reviewing the SN74GTLPH3245ZKFR datasheet, SN74GTLPH3245ZKFR pinout, SN74GTLPH3245ZKFR application, or SN74GTLPH3245ZKFR equivalent, key selection criteria include GTLP/LVTTL level translation capability, ERC-controlled rise/fall times (1.2–2.5 ns fast mode), distributed-load backplane timing (tPLH/tPHL = 3.7 ns typical), live-insertion compliance, and LFBGA-168 (GKF) package compatibility with high-density backplane card designs.
Technical Context
This device implements four independent 8-bit transceiver segments, each with dedicated DIR/OE controls, ERC input, BIAS VCC, and VREF pins. Its TI-OPC circuitry actively suppresses overshoot on unevenly loaded backplanes, while OEC circuitry reduces EMI and improves signal integrity under distributed RLC loads (11 Ω effective impedance).
The transceiver supports dual-mode operation: A-port and control signals operate at LVTTL logic levels (0–3.3 V, 5-V tolerant), while B-port interfaces with GTLP backplanes (VTT = 1.5 V, VREF = 1 V). ERC voltage selection (GND = slow, VCC = fast) directly sets B-port output edge rates to optimize data-transfer rate versus signal integrity trade-offs in real-world backplane topologies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage (VCC) | 3.15 V to 3.45 V - Ensures stable 3.3-V rail operation with ±4.5% tolerance for industrial temperature range. |
| B-port Output Drive | 100 mA sink - Enables incident-wave switching on heavily loaded backplanes down to 11 Ω characteristic impedance. |
| A-port Drive Strength | –24 mA / 24 mA - Compatible with standard LVTTL buses and 5-V TTL/CMOS inputs without level shifters. |
| Propagation Delay (A→B, Fast ERC) | 3.7 ns typical into RLC load - Verified for distributed backplane topologies, not lumped test loads. |
| Rise/Fall Time (B-port, Fast) | 1.2 ns / 1.8 ns (20–80%) - Adjustable via ERC pin to balance speed and ringing in multi-slot systems. |
| Live-Insertion Support | Ioff < 10 µA, IOZPU/IOZPD ±30 µA - Prevents backfeed current and bus conflict during hot-plug events. |
| Bus-Hold on A Inputs | IBHL ≥ 75 µA, IBHH ≥ –75 µA - Eliminates need for external pull resistors on undriven LVTTL data lines. |
Pinout & Package
LFBGA-168 package (GKF), 12 mm × 12 mm, 0.8-mm pitch, bottom-side solder balls. Features distributed VCC/GND pins to minimize simultaneous switching noise and dedicated BIAS VCC/VREF per segment for backplane precharge stability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1A1–1A8, 2A1–2A8, 3A1–3A8, 4A1–4A8 | LVTTL Data Inputs/Outputs (A-port) | 32-bit LVTTL interface; 5-V tolerant; integrated bus-hold active on all A inputs. |
| 1B1–1B8, 2B1–2B8, 3B1–3B8, 4B1–4B8 | GTLP Data Inputs/Outputs (B-port) | 32-bit GTLP backplane interface; requires VTT = 1.5 V and VREF = 1 V for proper threshold setting. |
| 1DIR–4DIR | Direction Control Input (per segment) | Active-high: enables A→B data flow; low: enables B→A flow - noninverting transparent mode. |
| 1OE–4OE | Output Enable Input (per segment) | Active-low: disables both A and B ports to high-impedance state - supports isolated bus segments. |
| 1ERC–4ERC | Edge-Rate Control Input (per segment) | GND = slow edge (tr/tf ≈ 2/2.5 ns); VCC = fast edge (tr/tf ≈ 1.2/1.8 ns) - per-segment optimization. |
| 1BIAS VCC–4BIAS VCC | Backplane Precharge Supply (per segment) | 3.3-V supply for B-port I/O preconditioning - enables true live insertion without backplane disturbance. |
| 1VREF–4VREF | Differential Input Reference (per segment) | Set to 1 V for GTLP mode - defines B-port input switching threshold at VREF ±50 mV. |
| VCC, GND | Core Power and Ground | Distributed across package (24 VCC + 24 GND balls) - reduces IR drop and SSN in high-speed switching. |
Key Features
| Feature | Design Value |
|---|---|
| TI-OPC Overshoot Control | Actively limits low-to-high transition overshoot on unterminated or slot-varying backplanes - maintains noise margin at >100 MHz. |
| OEC Signal Integrity Enhancement | Reduces electromagnetic interference and shortens bus settling time - validated across JEDEC-compliant backplane models. |
| Adjustable Edge-Rate Control (ERC) | Per-segment ERC input allows independent tuning of B-port rise/fall times to match local backplane loading - no board redesign needed. |
| Live-Insertion Circuitry | Ioff, power-up 3-state, and BIAS VCC collectively enable hot-swap capability without system reset or backplane glitching. |
| Integrated Bus-Hold on A Inputs | Holds floating LVTTL inputs at valid logic states - eliminates external pull resistors and associated board space and leakage risks. |
Applications
| Telecom Line Cards | Enterprise Router Backplanes |
|---|---|
Use Scenario: Hot-swappable line cards in carrier-grade routers exchange packet data across shared GTLP backplanes while maintaining uptime. IC Role / Device Role / Timing Role: SN74GTLPH3245ZKFR serves as the LVTTL-to-GTLP bridge between ASIC-based packet processors (LVTTL) and the high-speed backplane fabric (GTLP), managing direction, enable, and edge rate per 8-bit lane. Use Value: ERC adjustment allows tuning for varying slot counts and trace lengths; BIAS VCC prevents data corruption during card insertion/removal. |
Use Scenario: Multi-gigabit routing engines use distributed backplanes where signal integrity degrades with slot count and stub length. IC Role / Device Role / Timing Role: SN74GTLPH3245ZKFR provides controlled-edge GTLP drivers with TI-OPC to suppress reflections from empty slots and mismatched terminations. Use Value: Measured tPLH/tPHL = 3.7 ns into RLC load ensures deterministic timing across 20-slot chassis without re-timing logic. |
| Industrial PLC Backplane Modules | High-Availability Server Midplanes |
Use Scenario: Programmable logic controller modules plug into ruggedized backplanes operating in extended temperature environments (–40°C to 85°C). IC Role / Device Role / Timing Role: SN74GTLPH3245ZKFR translates field I/O processor LVTTL signals to GTLP for deterministic inter-module communication over 150-mm backplane traces. Use Value: Ioff < 10 µA and 5-V-tolerant A-port inputs ensure robustness against voltage transients and brownouts during field maintenance. |
Use Scenario: Dual-CPU server blades communicate via midplane using GTLP signaling to achieve >2 Gbps aggregate bandwidth with low skew. IC Role / Device Role / Timing Role: SN74GTLPH3245ZKFR isolates CPU memory controllers (LVTTL) from shared GTLP address/data bus, with per-lane OE control for dynamic bandwidth allocation. Use Value: Distributed VCC/GND pins and 24-mA A-port drive maintain signal fidelity across 16-layer PCBs with tight power delivery constraints. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74GTLPH3295ZKFR | Same 32-bit GTLP transceiver but with latch-enabled (non-transparent) operation instead of DIR-controlled transparency. | Suitable for synchronous bus architectures requiring clocked data capture rather than asynchronous direction control. | Select when system timing requires registered data transfer and deterministic setup/hold margins over variable propagation delays. |
| SN74GTL16622DGGR | 16-bit GTLP transceiver in TSSOP-56; lacks ERC, BIAS VCC, and live-insertion features; lower drive (64 mA). | Targeted at cost-sensitive, lower-density backplanes without hot-swap requirements. | Choose only for legacy 16-bit designs or space-constrained boards where full 32-bit, live-insertion, and ERC capability is unnecessary. |
Compared with SN74GTLPH3295ZKFR, the SN74GTLPH3245ZKFR offers true transparent bidirectional flow essential for asynchronous backplane arbitration; compared with SN74GTL16622DGGR, it delivers double bandwidth, per-segment edge-rate tuning, and certified live-insertion - critical for carrier-class reliability.
Availability
SN74GTLPH3245ZKFR is available at Aetrix Electronics and suitable for telecom line cards, enterprise router backplanes, and industrial PLC modules requiring stable component supply, long-term lifecycle support, and verified GTLP signal integrity performance.
Supply support for SN74GTLPH3245ZKFR 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 headquartered in Dallas, Texas, specializing in analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.
The SN74GTLPH3245ZKFR belongs to TI's Widebus+™ family of high-speed interface ICs, engineered specifically for reliable GTLP-level communication in modular, hot-pluggable backplane systems operating across –40°C to 85°C.
FAQ
What is the primary function of the SN74GTLPH3245ZKFR in a backplane system?
The SN74GTLPH3245ZKFR functions as a 32-bit bidirectional level-shifting bus transceiver that bridges LVTTL logic domains (e.g., ASICs, FPGAs) with GTLP-signaled backplanes. It enables high-speed, low-swing data transfer while supporting live insertion, adjustable edge rates, and distributed-load signal integrity - all critical for telecom and enterprise infrastructure equipment.
How does the ERC pin affect timing performance of the SN74GTLPH3245ZKFR?
The ERC pin on the SN74GTLPH3245ZKFR selects B-port output edge rates: ERC = GND yields slow edges (tr/tf ≈ 2/2.5 ns), reducing EMI on lightly loaded backplanes; ERC = VCC enables fast edges (tr/tf ≈ 1.2/1.8 ns), maximizing data rate on well-terminated, short-trace paths. This per-segment control allows system-level optimization without hardware changes.
Can the SN74GTLPH3245ZKFR operate with GTL (not GTLP) signaling standards?
Yes, the SN74GTLPH3245ZKFR supports both GTL (VTT = 1.2 V, VREF = 0.8 V) and GTLP (VTT = 1.5 V, VREF = 1 V) standards. Its AC specifications are guaranteed for GTLP, but DC parameters allow interoperability with GTL-compliant backplanes - confirmed by JESD 8-3 compliance and TI's dual-mode validation in SCES291D.
What design provisions does the SN74GTLPH3245ZKFR include for live insertion?
The SN74GTLPH3245ZKFR integrates three live-insertion features: Ioff circuitry (<10 µA off-state current), power-up 3-state (outputs remain high-Z until VCC stabilizes), and BIAS VCC (precharges B-port I/O before VCC ramp). Together, they prevent backfeeding, bus conflicts, and signal disturbance during hot-swap events - verified per JEDEC JESD78 Class II latch-up testing.
Is bus-hold functionality available on both A-port and B-port inputs of the SN74GTLPH3245ZKFR?
Bus-hold is implemented only on the A-port LVTTL inputs of the SN74GTLPH3245ZKFR, with minimum sustaining currents of ±75 µA. The B-port GTLP inputs do not include bus-hold; they require proper termination (RTT) and reference (VREF) to maintain valid logic states - as specified in the functional description and electrical characteristics tables of the official datasheet.
SN74GTLPH3245ZKFR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74GTLPH
- Package/Case:
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Translator Type:
- Mixed Signal
- Channel Type:
- Bidirectional
- Number of Circuits:
- 4
- Channels per Circuit:
- 8
- Voltage - VCCA:
- -
- Voltage - VCCB:
- -
- Input Signal:
- LVTTL
- Output Signal:
- GTLP
- Output Type:
- Tri-State, Non-Inverted
- Data Rate:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Features:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 114-LFBGA
SN74GTLPH3245ZKFR FAQ
1.How can I place an order for SN74GTLPH3245ZKFR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74GTLPH3245ZKFR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
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The price and inventory of SN74GTLPH3245ZKFR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74GTLPH3245ZKFR is usually 5 days.
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5.How can I obtain technical support or documentation for SN74GTLPH3245ZKFR?
For technical support, including SN74GTLPH3245ZKFR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74GTLPH3245ZKFR requirements.
6.How does Aetrix verify that SN74GTLPH3245ZKFR is sourced from the original manufacturer or authorized distributors?
All SN74GTLPH3245ZKFR 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 SN74GTLPH3245ZKFR meets industry standards.
7.What is the process for return or replacement of SN74GTLPH3245ZKFR?
All SN74GTLPH3245ZKFR units undergo pre-shipment inspection (PSI). If there is an issue with SN74GTLPH3245ZKFR, 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 SN74GTLPH3245ZKFR part is unused and in its original packaging.
Return procedure for SN74GTLPH3245ZKFR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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