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Texas Instruments SN74GTLPH1645ZQLR
- Part No.:
- SN74GTLPH1645ZQLR
- Manufacturer:
- Texas Instruments
- Category:
- Translators, Level Shifters
- Package:
- Datasheet:
-
SN74GTLPH1645ZQLR.pdf
- Description:
- IC TRANSLTR BIDIRECTIONAL 56BGA
- Quantity:
- Payment:
- Shipping:
Inventory:2,675
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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 VREF/VTT compatibility with JEDEC JESD8-3 GTLP standards.
Technical Context
The SN74GTLPH1645 implements two independent 8-bit transceivers with noninverting data flow, direction-controlled by DIR and output-enabled by OE. Its TI-OPC™ circuitry actively suppresses overshoot on unevenly terminated backplanes, while OEC™ improves signal integrity and reduces EMI during high-speed switching.
It supports dual-mode operation: GTL (VTT = 1.2 V, VREF = 0.8 V) and GTLP (VTT = 1.5 V, VREF = 1.0 V). The ERC input selects between slow (ERC = GND) and fast (ERC = VCC) B-port edge rates, enabling optimization for noise margin vs. data rate across distributed RLC backplane loads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Supply | 3.15–3.45 V - powers LVTTL logic and internal biasing; operation outside this range invalidates GTLP timing and drive specs. |
| B-port Output Drive | 100 mA sink - enables incident-wave switching into heavily loaded backplanes down to 11 Ω characteristic impedance. |
| A-port Input Tolerance | 5 V - allows direct interfacing with TTL and 5-V CMOS without level-shifting circuitry. |
| B-port Edge Rate (Fast) | Rise/fall time 1.2–1.8 ns (20%–80%) - minimizes bus settling time for >100 MHz data rates on distributed loads. |
| Live-Insertion Support | Ioff < 10 µA at VCC = 0, BIAS VCC = 0 - prevents backflow current during hot-plug; BIAS VCC precharges B-port I/O before VCC ramp. |
| Propagation Delay (A→B, Fast) | tPLH/tPHL ≤ 3.7 ns - measured at VTT = 1.5 V, VREF = 1.0 V, CL = 18 pF, RLC load - guarantees sub-4 ns latency in GTLP mode. |
| Bus Hold Current | IBHL ≥ 75 µA / IBHH ≥ 75 µA - maintains valid logic state on undriven A-port inputs without external pull resistors. |
Pinout & Package
VFBGA-56 (GQL package), 7 mm × 5.5 mm, 0.5 mm pitch, bottom-side ball array. Pin 1 located at corner A1 per JEDEC MO-194 standard.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1A1–1A8, 2A1–2A8 | LVTTL Data Inputs/Outputs (A port) | 5-V-tolerant bidirectional interface to system logic; bus-hold active when floating. |
| 1B1–1B8, 2B1–2B8 | GTLP Data Inputs/Outputs (B port) | High-drive (100 mA) backplane interface; differential input referenced to VREF. |
| 1DIR, 2DIR | Direction Control (Active-High) | Selects A→B (DIR = H) or B→A (DIR = L); controls data flow per 8-bit segment. |
| 1OE, 2OE | Output Enable (Active-Low) | Places corresponding 8-bit port in high-Z; power-up 3-state ensures no conflict during ramp. |
| ERC | Edge-Rate Control | GND = slow edges (≥2.5 ns fall), VCC = fast edges (≤1.8 ns fall) - tunes signal integrity vs. speed. |
| VREF | B-port Differential Reference | Set to 0.8 V (GTL) or 1.0 V (GTLP); defines GTLP input threshold and noise margin. |
| BIAS VCC | Backplane Precharge Supply | 3.3 V supply that preconditions B-port I/O before main VCC ramp - enables true live insertion. |
| VCC, GND | Power & Ground | Distributed VCC/GND pins minimize simultaneous switching noise; 12 total GND pins reduce ground bounce. |
Key Features
| Feature | Design Value |
|---|---|
| TI-OPC™ Overshoot Control | Actively limits low-to-high transition overshoot on unterminated or slot-varying backplanes, preserving noise margin at >100 MHz. |
| OEC™ Signal Integrity Enhancement | Reduces EMI and bus settling time via optimized output driver architecture - validated across multiple JEDEC-compliant backplane models. |
| Adjustable Edge-Rate Control (ERC) | Single-pin voltage selection (GND/VCC) changes B-port rise/fall times by >2× - enables system-level tuning without layout change. |
| Live-Insertion Ready | Ioff, power-up 3-state, and BIAS VCC collectively eliminate bus conflicts, backfeed, and data corruption during card hot-swap. |
| Bus Hold on A-port Inputs | Eliminates need for external pull resistors on unused LVTTL inputs - reduces BOM count and PCB space in modular systems. |
| Distributed Power/Ground Pins | 12 GND and 6 VCC pins interleaved across package - lowers high-frequency impedance and suppresses simultaneous switching noise. |
Applications
| Telecom Line Cards | Modular Server Backplanes |
|---|---|
Use Scenario: High-density line cards plug into carrier backplanes with variable slot loading and impedance discontinuities. IC Role / Device Role / Timing Role: Bidirectional GTLP transceiver translating LVTTL control/data from FPGA/ASIC to GTLP backplane signals. Use Value: TI-OPC™ suppresses overshoot across empty slots; 100 mA drive sustains signal integrity into 11 Ω loads; ERC optimizes edge rate per slot configuration. |
Use Scenario: Hot-swappable compute modules connect to shared high-speed backplane with distributed RC loads. IC Role / Device Role / Timing Role: Level-shifting bus interface enabling LVTTL-based processors to communicate over GTLP backplane infrastructure. Use Value: BIAS VCC precharges B-port I/O before VCC ramp; Ioff prevents backfeed during insertion; tPLH ≤ 3.7 ns supports >266 MHz data throughput. |
| Industrial PLC Chassis | Test Equipment Modular Interfaces |
Use Scenario: Programmable logic controllers use modular I/O cards inserted into ruggedized chassis with long trace runs. IC Role / Device Role / Timing Role: Robust backplane transceiver providing noise-immune communication between CPU module and field I/O modules. Use Value: OEC™ reduces EMI in electrically noisy environments; 5-V-tolerant A-port accepts legacy TTL sensors; VREF adjustment optimizes noise margin. |
Use Scenario: Automated test systems require reconfigurable instrument modules with deterministic timing and hot-swap capability. IC Role / Device Role / Timing Role: Synchronization and data routing interface between controller FPGA and GTLP-based measurement modules. Use Value: Power-up 3-state prevents bus contention during module boot; ERC fine-tunes setup/hold margins for precise timing capture. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74GTL16622DGGR | No ERC input; fixed edge rate; lower drive (64 mA); no BIAS VCC or live-insertion features. | Suitable only for static, well-terminated backplanes without hot-swap requirement. | Choose if cost sensitivity outweighs live-insertion and edge-rate tuning needs. |
| SN74AVC16T245DGGR | AVC-series voltage translator (1.2–3.6 V); no GTLP compliance; max 32 mA drive; no VREF or VTT support. | Designed for point-to-point low-voltage logic translation, not backplane signaling. | Select only for LVTTL-to-LVTTL or LVTTL-to-low-V logic; not a GTLP replacement. |
Compared with SN74GTLPH1645, SN74GTL16622DGGR lacks ERC, BIAS VCC, and Ioff-making it unsuitable for live-insertion or variable-load backplanes-while SN74AVC16T245DGGR operates outside GTLP voltage/current specifications and cannot drive 11 Ω backplane loads.
Availability
SN74GTLPH1645 is available at Aetrix Electronics and suitable for telecom line cards, modular server backplanes, industrial PLC chassis, and automated test equipment requiring stable component supply and long-term 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 over 50 years of innovation in high-speed interface ICs.
The SN74GTLPH1645 belongs to TI's Widebus™ family, engineered specifically for high-reliability, high-speed backplane interconnect in modular systems requiring live insertion, GTLP compliance, and distributed-load signal integrity.
FAQ
What is the primary function of the ERC pin on the SN74GTLPH1645?
The ERC (Edge-Rate Control) pin on the SN74GTLPH1645 selects between slow and fast B-port output edge rates: ERC = GND yields slower rise/fall times (~2.5 ns), improving noise margin on poorly terminated backplanes; ERC = VCC enables faster edges (~1.2–1.8 ns), maximizing data rate on well-matched loads. This single-pin control allows system-level tuning without hardware changes - a critical feature for the SN74GTLPH1645 in variable-impedance backplane applications.
Does the SN74GTLPH1645 support true live insertion, and how is it implemented?
Yes, the SN74GTLPH1645 supports true live insertion through three integrated features: Ioff limits current backflow when VCC = 0; power-up 3-state holds outputs high-Z during VCC ramp; and BIAS VCC precharges B-port I/O before main VCC is applied. Together, these ensure no bus conflict, no data corruption, and no damage during hot-swap - verified per JEDEC JESD78 Class II latch-up testing. This makes the SN74GTLPH1645 uniquely suited for modular telecom and server chassis where reliability during maintenance is essential.
Can the SN74GTLPH1645 operate with both GTL and GTLP signaling standards?
Yes, the SN74GTLPH1645 is fully compatible with both GTL (VTT = 1.2 V, VREF = 0.8 V) and GTLP (VTT = 1.5 V, VREF = 1.0 V) standards per JEDEC JESD8-3. Its ac specifications are guaranteed for GTLP, but dc parameters remain valid across both modes. VREF must be set within ±0.1 V of nominal value, and TI-OPC™ is enabled only when VTT exceeds VREF by >0.7 V - a condition met in both configurations. This dual-mode flexibility allows the SN74GTLPH1645 to serve legacy GTL systems and newer GTLP infrastructures without redesign.
What is the role of BIAS VCC in the SN74GTLPH1645, and how should it be connected?
BIAS VCC on the SN74GTLPH1645 supplies precharge current to B-port I/O pins before main VCC ramps, preventing disturbance of active backplane signals during card insertion. It must be connected to 3.3 V *before* VCC and *after* GND in the hot-swap sequence. If B-port precharge is not required, BIAS VCC may be tied to VCC, but the recommended sequence (GND → BIAS VCC → I/O → VCC) is mandatory for full live-insertion capability - a defining feature of the SN74GTLPH1645 in modular systems.
How does the SN74GTLPH1645 handle undriven A-port inputs?
The SN74GTLPH1645 integrates active bus-hold circuitry on all A-port data inputs (1A1–1A8, 2A1–2A8), which sources or sinks ≥75 µA to maintain a valid logic state when inputs float. This eliminates the need for external pullup/pulldown resistors, reducing BOM cost and PCB area. Bus-hold is always enabled and incompatible with external resistors - applying them degrades noise margin and violates the SN74GTLPH1645's specified operating conditions per TI SCBA004 guidelines.
SN74GTLPH1645ZQLR 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:
- 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-VFBGA
SN74GTLPH1645ZQLR FAQ
1.How can I place an order for SN74GTLPH1645ZQLR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74GTLPH1645ZQLR 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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For technical support, including SN74GTLPH1645ZQLR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74GTLPH1645ZQLR requirements.
6.How does Aetrix verify that SN74GTLPH1645ZQLR is sourced from the original manufacturer or authorized distributors?
All SN74GTLPH1645ZQLR 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 SN74GTLPH1645ZQLR meets industry standards.
7.What is the process for return or replacement of SN74GTLPH1645ZQLR?
All SN74GTLPH1645ZQLR units undergo pre-shipment inspection (PSI). If there is an issue with SN74GTLPH1645ZQLR, 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 SN74GTLPH1645ZQLR part is unused and in its original packaging.
Return procedure for SN74GTLPH1645ZQLR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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