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Texas Instruments SN74GTLPH1645DGGR
- Part No.:
- SN74GTLPH1645DGGR
- Manufacturer:
- Texas Instruments
- Category:
- Translators, Level Shifters
- Package:
- Datasheet:
-
SN74GTLPH1645DGGR.pdf
- Description:
- IC TRANSLATOR BIDIR 56TSSOP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SN74GTLPH1645 from Texas Instruments is a 16-bit LVTTL-to-GTLP bidirectional bus transceiver with adjustable edge-rate control (ERC), 100 mA GTLP B-port drive, 5-V-tolerant LVTTL A-port inputs, and live-insertion support via Ioff, power-up 3-state, and BIAS VCC. It enables high-speed backplane communication in telecom line cards and modular computing systems.
For engineers reviewing the SN74GTLPH1645 datasheet, SN74GTLPH1645 pinout, SN74GTLPH1645 application, or SN74GTLPH1645 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), 11 Ω minimum load drive, and TSSOP-56 package compatibility with JEDEC MO-153.
Technical Context
The SN74GTLPH1645 implements two independent 8-bit transceivers with noninverting data flow, direction-controlled by DIR inputs and output-enabled by OE. Its TI-OPC™ circuitry actively suppresses overshoot on unevenly terminated backplanes, while OEC™ improves signal integrity and reduces EMI.
It supports dual-mode operation: GTL (VTT = 1.2 V, VREF = 0.8 V) or GTLP (VTT = 1.5 V, VREF = 1.0 V). The BIAS VCC pin preconditions B-port I/O during live insertion, and bus-hold circuitry maintains valid logic states on undriven A-port inputs without external resistors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Supply | 3.15–3.45 V - ensures stable operation across industrial temperature range and minimizes supply noise coupling into high-speed GTLP outputs. |
| B-Port Output Drive | 100 mA - enables incident-wave switching on heavily loaded backplanes with characteristic impedance down to 11 Ω. |
| A-Port Drive | –24 mA / 24 mA - provides standard LVTTL-compatible sourcing/sinking for interface with 5-V-tolerant controllers and FPGAs. |
| Edge-Rate Control (ERC) | GND = slow (tr/tf ≈ 2–2.5 ns), VCC = fast (tr/tf ≈ 1.2–1.8 ns) - allows dynamic optimization of signal integrity vs. data rate in varying backplane loads. |
| Propagation Delay (A→B) | 3.7 ns typical (fast mode) - supports >250 MHz data transfer rates in distributed RLC backplane models per TI-SPICE validation. |
| Live-Insertion Support | Ioff < 10 µA at VCC = 0, BIAS VCC = 0 - prevents backflow current during hot-swap; power-up 3-state avoids bus contention. |
| Input Threshold (B port) | VREF ±0.05 V - enables precise differential GTLP input sensing with noise margin tuning via adjustable VREF. |
Pinout & Package
TSSOP-56 package (DGG), 12.0 mm × 6.2 mm × 1.2 mm max height, JEDEC MO-153 compliant, with distributed VCC/GND pins to minimize simultaneous switching noise.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1DIR, 2DIR | Direction control input | Selects A→B (DIR = H) or B→A (DIR = L); enables bidirectional data routing without external logic. |
| 1OE, 2OE | Output enable input | Active-low control: OE = L enables transceiver; OE = H places both ports in high-impedance isolation state. |
| 1A1–1A8, 2A1–2A8 | LVTTL data inputs/outputs | 5-V-tolerant A-port signals; bus-hold circuitry maintains logic state when un-driven - eliminates need for pull resistors. |
| 1B1–1B8, 2B1–2B8 | GTLP data inputs/outputs | High-drive B-port interfaces directly to backplane; requires VTT termination and VREF reference for differential input operation. |
| ERC | Edge-rate control input | DC voltage level (GND or VCC) selects B-port output slew rate - critical for optimizing eye diagram opening in multi-slot systems. |
| BIAS VCC | Live-insertion precharge supply | Must be applied before VCC to precondition B-port I/O lines and prevent disturbance of active backplane data during card insertion. |
| VREF | Differential input reference | Set to 1.0 V (GTLP) or 0.8 V (GTL); defines B-port input threshold - adjustable to maximize noise margin in noisy environments. |
Key Features
| Feature | Design Value |
|---|---|
| TI-OPC™ Overshoot Control | Actively limits low-to-high transition overshoot on unterminated or unevenly loaded backplanes - maintains signal integrity without external termination networks. |
| OEC™ Signal Integrity Enhancement | Reduces electromagnetic interference and shortens bus settling time - validated across multiple backplane models including distributed RLC loads. |
| Adjustable Edge-Rate Control (ERC) | Two discrete slew rates (fast/slow) selected by single DC voltage - enables system-level trade-off between timing margin and EMI in mixed-load configurations. |
| Live-Insertion Ready | Integrated Ioff, power-up 3-state, and BIAS VCC - satisfies hot-swap requirements in NEBS-compliant telecom chassis without auxiliary circuitry. |
| Bus-Hold on A-Port Inputs | Internal latching holds unused LVTTL inputs at last-valid logic level - eliminates floating inputs and associated noise susceptibility in modular backplane designs. |
Applications
| Telecom Line Card Interface | Modular Server Backplane |
|---|---|
Use Scenario: Interfacing FPGA-based packet processing modules to shared GTLP backplane in carrier-grade routers. IC Role / Device Role / Timing Role: Level-translating bidirectional transceiver enabling LVTTL control logic to drive and read GTLP backplane signals. Use Value: 100 mA B-port drive sustains signal integrity across 20-slot backplane with <3.7 ns propagation delay, supporting OC-192 line rates. |
Use Scenario: Hot-swappable compute blade connecting to midplane in enterprise server chassis. IC Role / Device Role / Timing Role: Live-insertion-capable bus interface ensuring zero bus contention during blade insertion/removal. Use Value: BIAS VCC + Ioff + power-up 3-state guarantee safe hot-swap per GR-63-CORE; ERC fine-tunes edge rate per slot loading. |
| Industrial PLC Backplane | Test Equipment Modular Rack |
Use Scenario: Real-time I/O module communicating with central controller over deterministic GTLP backplane in factory automation systems. IC Role / Device Role / Timing Role: Asynchronous bidirectional data bridge translating between LVTTL sensor/actuator logic and GTLP backbone. Use Value: Distributed VCC/GND pins suppress switching noise; bus-hold prevents spurious reads during transient I/O states. |
Use Scenario: Reconfigurable instrument module exchanging high-speed waveform data with mainframe via shared backplane. IC Role / Device Role / Timing Role: High-drive transceiver enabling >200 MHz data bursts between digitizer and processor modules. Use Value: Fast edge-rate mode (1.2 ns tr) delivers clean eye diagrams at 250+ MHz; OEC™ reduces crosstalk-induced jitter in dense rack layouts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74GTL16622DGGR | Fixed-edge-rate GTLP outputs (no ERC), lower drive (64 mA), no BIAS VCC or live-insertion features. | Suitable for static backplanes where edge-rate tuning and hot-swap are not required. | Choose when cost sensitivity outweighs configurability and live-insertion needs. |
| SN74AVC16T245DGGR | AVC-series 1.8/2.5/3.3 V dual-supply transceiver; no GTLP support, max 32 mA drive, no TI-OPC/OEC. | Designed for point-to-point LVCMOS/LVTTL interconnect, not backplane distribution. | Select only for low-voltage, low-noise, short-reach board-level links - not a functional replacement for GTLP backplane use. |
Compared with SN74GTLPH1645, SN74GTL16622DGGR lacks ERC, BIAS VCC, and live-insertion hardening, limiting it to fixed-configuration backplanes; SN74AVC16T245DGGR operates at lower voltages and drive strength, making it unsuitable for GTLP-compliant distributed loads requiring 100 mA drive and TI-OPC signal conditioning.
Availability
SN74GTLPH1645 is available at Aetrix Electronics and suitable for telecom line card design, modular server backplane integration, and industrial PLC chassis requiring stable component supply with full lifecycle support.
Supply support for SN74GTLPH1645 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 logic solutions with broad industrial and communications portfolio coverage.
The SN74GTLPH1645 belongs to TI's Widebus™ family of high-speed interface ICs, engineered specifically for robust GTLP backplane communication in carrier-class and modular computing systems demanding live insertion and signal integrity under variable load conditions.
FAQ
What is the primary function of the SN74GTLPH1645 in a backplane system?
The SN74GTLPH1645 serves as a bidirectional LVTTL-to-GTLP level translator and driver, enabling high-speed communication between LVTTL-based control logic (e.g., FPGAs) and GTLP-signaled backplanes. Its 100 mA B-port drive, TI-OPC™ overshoot control, and ERC-adjustable edge rates make it essential for maintaining signal integrity across multi-slot, unevenly loaded telecom and server backplanes.
How does the ERC pin affect SN74GTLPH1645 performance?
The ERC pin on the SN74GTLPH1645 selects between two discrete B-port output slew rates: ERC = GND yields slow edges (~2.5 ns fall time), while ERC = VCC enables fast edges (~1.2 ns fall time). This adjustment optimizes the trade-off between data-transfer rate and signal integrity - faster edges improve timing margin in lightly loaded slots, slower edges reduce EMI and ringing in heavily loaded or unterminated sections of the backplane.
Can SN74GTLPH1645 operate with GTL instead of GTLP signaling?
Yes, the SN74GTLPH1645 supports both GTL (VTT = 1.2 V, VREF = 0.8 V) and GTLP (VTT = 1.5 V, VREF = 1.0 V) standards. Its AC specifications are guaranteed for GTLP, but the device functions correctly in GTL mode with appropriate termination and reference voltage settings. Designers may select GTL for lower power or legacy compatibility, though GTLP offers higher noise margin and is TI's preferred configuration.
What is the role of BIAS VCC in SN74GTLPH1645 live-insertion operation?
BIAS VCC on the SN74GTLPH1645 precharges and preconditions the B-port I/O lines prior to main VCC application, preventing transient disturbances on an active backplane during card insertion. It must be connected before VCC and after GND in the hot-swap sequence. Without proper BIAS VCC sequencing, live insertion can cause data corruption or bus contention - this feature is integral to the SN74GTLPH1645's NEBS-compliant hot-swap capability.
Does SN74GTLPH1645 require external pull-up or pull-down resistors on A-port inputs?
No, the SN74GTLPH1645 includes active bus-hold circuitry on all A-port inputs, which maintains a valid logic state (last-driven value) when inputs are floating or undriven. TI explicitly advises against using external pull-up or pull-down resistors with these pins, as they interfere with bus-hold functionality and may degrade noise immunity or increase power consumption unnecessarily.
SN74GTLPH1645DGGR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74GTLPH
- Package/Case:
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Translator Type:
- Mixed Signal
- Channel Type:
- Bidirectional
- Number of Circuits:
- 2
- 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:
- 56-TFSOP (0.240", 6.10mm Width)
SN74GTLPH1645DGGR FAQ
1.How can I place an order for SN74GTLPH1645DGGR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74GTLPH1645DGGR 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 SN74GTLPH1645DGGR reliable?
The price and inventory of SN74GTLPH1645DGGR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74GTLPH1645DGGR is usually 5 days.
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Once your SN74GTLPH1645DGGR 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 SN74GTLPH1645DGGR?
For technical support, including SN74GTLPH1645DGGR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74GTLPH1645DGGR requirements.
6.How does Aetrix verify that SN74GTLPH1645DGGR is sourced from the original manufacturer or authorized distributors?
All SN74GTLPH1645DGGR 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 SN74GTLPH1645DGGR meets industry standards.
7.What is the process for return or replacement of SN74GTLPH1645DGGR?
All SN74GTLPH1645DGGR units undergo pre-shipment inspection (PSI). If there is an issue with SN74GTLPH1645DGGR, 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 SN74GTLPH1645DGGR part is unused and in its original packaging.
Return procedure for SN74GTLPH1645DGGR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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