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Texas Instruments SN74GTLPH1645DGVR
- Part No.:
- SN74GTLPH1645DGVR
- Manufacturer:
- Texas Instruments
- Category:
- Translators, Level Shifters
- Package:
- Datasheet:
-
SN74GTLPH1645DGVR.pdf
- Description:
- IC TRANSLATOR BIDIR 56TVSOP
- 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 interfaces, 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), 56-pin TVSOP (DGV) package compatibility, and live-insertion robustness for hot-swap chassis designs.
Technical Context
The SN74GTLPH1645 implements dual 8-bit transceivers with noninverting data flow, direction-controlled by DIR inputs per port and output-enable gated by OE. Its TI-OPC™ circuitry actively suppresses overshoot on unevenly terminated backplanes, while OEC™ improves signal integrity and reduces EMI.
Edge-rate control is implemented via the ERC input: grounding ERC selects slow edge rates (tr/tf ≈ 2–4 ns), tying to VCC selects fast rates (tr/tf ≈ 1.2–2.5 ns), enabling optimization of data-transfer rate versus signal integrity across varying backplane loads down to 11 Ω.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Supply | 3.15 V to 3.45 V - ensures stable operation within standard 3.3 V rail tolerance, compatible with industrial-grade power supplies. |
| B-port Output Drive | 100 mA sink - supports incident-wave switching on heavily loaded backplanes with characteristic impedance as low as 11 Ω. |
| A-port Drive | –24 mA / 24 mA - provides LVTTL-compatible sourcing/sinking for interfacing with 5-V-tolerant logic and microcontrollers. |
| Propagation Delay (A→B) | 3.7 ns typical (fast ERC) - enables >250 MHz data transfer on distributed backplane loads per JEDEC JESD8-3 GTLP timing. |
| Rise/Fall Time (B-port) | 1.2 ns (fast), 2.5 ns (slow) - user-selectable via ERC voltage to balance noise margin and timing closure in multi-slot systems. |
| Live-Insertion Support | Ioff < 10 µA at VCC = 0 - prevents backflow current during card insertion; BIAS VCC precharges B-port I/O to avoid bus disturbance. |
| Input Threshold (B-port) | VREF = 0.87–1.1 V - sets differential GTLP input reference for noise-immune reception in noisy backplane environments. |
Pinout & Package
SN74GTLPH1645DGVR is packaged in a 56-pin TVSOP (DGV) with 0.4 mm pitch, 11.4 mm × 4.4 mm body, and 1.2 mm max height - optimized for high-density backplane card layouts and automated assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1DIR, 2DIR | Direction control for Port 1 and Port 2 | Determines data flow direction: high = A→B, low = B→A; enables independent control of two 8-bit segments. |
| 1OE, 2OE | Output enable for Port 1 and Port 2 | Active-low control; drives outputs to high-Z when high - isolates buses during power transitions or fault conditions. |
| ERC | Edge-rate control input | Selects B-port output slew rate: GND = slow (2–4 ns), VCC = fast (1.2–2.5 ns) - critical for tuning signal integrity vs. speed. |
| BIAS VCC | Backplane I/O precharge supply | Preconditions B-port pins before VCC ramp-up - enables true live insertion without disturbing active backplane traffic. |
| VREF | B-port differential input reference | Sets GTLP receiver threshold; typically 1 V for GTLP mode - must be stable and low-noise to maintain noise margin. |
| GND / VCC (distributed) | Power/ground terminals | Multiple distributed GND/VCC pins minimize simultaneous switching noise and improve high-frequency PSRR. |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable edge-rate control (ERC) | Two discrete slew-rate modes (fast/slow) selectable via single pin - eliminates need for external RC networks or layout iterations. |
| TI-OPC™ overshoot suppression | Active clamping during low-to-high transitions on unterminated or unevenly loaded backplanes - maintains signal integrity without external termination resistors. |
| OEC™ circuitry | Reduces electromagnetic interference and bus settling time - verified across multiple JEDEC-compliant backplane models including distributed RLC loads. |
| Bus-hold on A-port inputs | Eliminates need for external pullup/pulldown resistors on unused LVTTL inputs - reduces BOM count and PCB area in modular systems. |
| 5-V tolerant LVTTL interface | Accepts TTL, 5-V CMOS, and 3.3-V LVTTL logic levels on A-port and controls - simplifies integration with legacy and mixed-voltage system controllers. |
Applications
| Telecom Line Cards | Modular Server Backplanes |
|---|---|
Use Scenario: High-speed interconnection between processor mezzanine cards and shared GTLP backplane in carrier-grade routers. IC Role / Device Role / Timing Role: Bidirectional level translator and driver enabling LVTTL-based control logic to communicate with GTLP-signaled backplane infrastructure. Use Value: 100 mA B-port drive sustains signal integrity across 19-slot backplanes; ERC tuning adapts to variable slot loading without redesign. | Use Scenario: Hot-pluggable compute modules inserting into a centralized GTLP-switched fabric in data center blade servers. IC Role / Device Role / Timing Role: Live-insertion transceiver providing isolation, precharge, and direction-controlled data routing during module insertion/removal. Use Value: BIAS VCC and Ioff ensure zero bus disturbance; power-up 3-state prevents driver conflict during staggered power sequencing. |
| Industrial PLC Backplanes | Test Equipment Modular Chassis |
Use Scenario: Real-time deterministic I/O expansion between controller CPU and field I/O modules over ruggedized GTLP backplane. IC Role / Device Role / Timing Role: Robust bus interface translating industrial LVTTL control signals to noise-immune GTLP backplane signaling. Use Value: TI-OPC™ mitigates reflections from long stubs and unterminated slots; latch-up immunity (>100 mA) meets IEC 61000-4-2 requirements. | Use Scenario: Reconfigurable instrument modules sharing high-speed trigger and data lines in automated test systems. IC Role / Device Role / Timing Role: Synchronized bidirectional data bridge between LVTTL FPGA controllers and GTLP instrumentation backplane. Use Value: Adjustable edge rates optimize timing margins across mixed-module configurations; distributed VCC/GND pins suppress switching noise in sensitive analog measurement paths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74GTL16623DGVR | Fixed-edge-rate GTLP transceiver (no ERC); lower drive (64 mA); no BIAS VCC or live-insertion features. | Lacks ERC tuning and live-insertion support - suitable only for static, fully populated backplanes with fixed termination. | Choose only if ERC and hot-swap capability are unnecessary and cost reduction is prioritized over flexibility. |
| SN74AVC16T245DGVR | AVC-family 16-bit dual-supply transceiver; operates at 1.2–3.6 V; no GTLP compliance; max 32 mA drive. | Designed for voltage translation (e.g., 1.8 V ↔ 3.3 V), not GTLP backplane signaling - incompatible with VTT/VREF backplane architecture. | Select only for low-voltage, point-to-point voltage-level shifting; not a functional substitute for GTLP backplane interfacing. |
Compared with SN74GTLPH1645DGVR, SN74GTL16623DGVR sacrifices edge-rate adaptability and live-insertion robustness for lower cost, while SN74AVC16T245DGVR serves entirely different voltage-translation use cases and cannot replace GTLP signaling functionality.
Availability
SN74GTLPH1645DGVR is available at Aetrix Electronics and suitable for telecom line cards, modular server backplanes, and industrial PLC backplanes requiring stable component supply, long-term lifecycle support, and consistent GTLP timing performance.
Supply support for SN74GTLPH1645DGVR 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 decades of expertise in high-speed interface ICs and backplane technologies.
The SN74GTLPH1645 belongs to TI's Widebus™ family of high-drive bus transceivers, engineered specifically for GTLP-compliant backplane systems in telecom, enterprise networking, and industrial modular architectures.
FAQ
What is the primary function of the ERC pin on the SN74GTLPH1645DGVR?
The ERC (Edge-Rate Control) pin on the SN74GTLPH1645DGVR selects between two B-port output slew rates: grounding ERC enables slow edge rates (~2–4 ns), while tying it to VCC enables fast edge rates (~1.2–2.5 ns). This allows designers to optimize signal integrity and timing closure for specific backplane load conditions without hardware changes. The SN74GTLPH1645DGVR's ERC feature is integral to its GTLP compliance and distributed-load performance.
Does the SN74GTLPH1645DGVR support live insertion, and how is it implemented?
Yes, the SN74GTLPH1645DGVR supports true live insertion via three integrated features: Ioff limits backflow current when powered down, power-up 3-state holds outputs in high-Z during power ramping, and BIAS VCC precharges B-port I/O pins before VCC is applied. These functions collectively prevent bus disturbance and driver conflicts during hot-swap events. The SN74GTLPH1645DGVR's live-insertion capability is validated per JEDEC standards and documented in its electrical characteristics tables.
What are the recommended operating conditions for VREF and VTT when using the SN74GTLPH1645DGVR in GTLP mode?
In GTLP mode, the SN74GTLPH1645DGVR requires VTT = 1.35–1.65 V (nominal 1.5 V) and VREF = 0.87–1.1 V (nominal 1.0 V). VREF should be set to approximately two-thirds of VTT to maximize noise margin; TI-OPC™ is enabled when VTT exceeds VREF by >0.7 V. These values are specified in the SN74GTLPH1645DGVR's Recommended Operating Conditions table and are critical for reliable differential GTLP receiver operation.
Can the SN74GTLPH1645DGVR interface with standard TTL or 5-V CMOS logic?
Yes, the SN74GTLPH1645DGVR's A-port inputs, outputs, and control signals (DIR, OE) are 5-V tolerant and fully compatible with TTL and 5-V CMOS logic families. This allows direct connection to legacy microcontrollers, FPGAs, or ASICs without level-shifting circuitry. The SN74GTLPH1645DGVR maintains LVTTL voltage thresholds (VIH ≥ 2 V, VIL ≤ 0.8 V) while accepting up to 5.5 V input - confirmed in its Absolute Maximum Ratings and Electrical Characteristics sections.
What package type and dimensions does the SN74GTLPH1645DGVR use, and what are its assembly considerations?
The SN74GTLPH1645DGVR uses a 56-pin TVSOP (DGV) package: 11.4 mm × 4.4 mm body, 1.2 mm max height, 0.4 mm lead pitch. Its land pattern requires non-solder-mask-defined pads per IPC-7351, and stencil design should use trapezoidal apertures for optimal paste release. The SN74GTLPH1645DGVR's MSL Level-1 rating permits unlimited floor life, and its NIPDAU finish ensures compatibility with standard Pb-free reflow profiles.
SN74GTLPH1645DGVR 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 (0.173", 4.40mm Width)
SN74GTLPH1645DGVR FAQ
1.How can I place an order for SN74GTLPH1645DGVR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74GTLPH1645DGVR 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 SN74GTLPH1645DGVR reliable?
The price and inventory of SN74GTLPH1645DGVR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74GTLPH1645DGVR is usually 5 days.
3.What payment methods are accepted for SN74GTLPH1645DGVR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74GTLPH1645DGVR transactions.
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4.How is shipping managed for SN74GTLPH1645DGVR?
SN74GTLPH1645DGVR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74GTLPH1645DGVR 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 SN74GTLPH1645DGVR?
For technical support, including SN74GTLPH1645DGVR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74GTLPH1645DGVR requirements.
6.How does Aetrix verify that SN74GTLPH1645DGVR is sourced from the original manufacturer or authorized distributors?
All SN74GTLPH1645DGVR 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 SN74GTLPH1645DGVR meets industry standards.
7.What is the process for return or replacement of SN74GTLPH1645DGVR?
All SN74GTLPH1645DGVR units undergo pre-shipment inspection (PSI). If there is an issue with SN74GTLPH1645DGVR, 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 SN74GTLPH1645DGVR part is unused and in its original packaging.
Return procedure for SN74GTLPH1645DGVR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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