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Texas Instruments SN74LXC1T45DCKR
- Part No.:
- SN74LXC1T45DCKR
- Manufacturer:
- Texas Instruments
- Category:
- Translators, Level Shifters
- Package:
- Datasheet:
-
SN74LXC1T45DCKR.pdf
- Description:
- IC TRANSLTR BIDIRECTIONAL SC70-6
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SN74LXC1T45 from Texas Instruments is a single-bit, dual-supply noninverting bidirectional bus transceiver enabling voltage level translation between 1.1 V and 5.5 V domains. It features independent VCCA and VCCB rails, Schmitt-trigger inputs for noise immunity, integrated dynamic pull-downs on I/Os, static pull-downs on DIR control, and VCC isolation with Ioff-float for partial power-down operation. It supports up to 420 Mbps in 3.3 V → 5.0 V translation and operates across –40°C to +125°C.
For engineers reviewing the SN74LXC1T45 datasheet, SN74LXC1T45 pinout, SN74LXC1T45 application, or SN74LXC1T45 equivalent, key selection criteria include configurable dual-rail supply range (1.1–5.5 V), guaranteed glitch-free power sequencing, bidirectional direction control referenced to VCCA, Ioff-float behavior during supply loss, and robust ESD protection (±4000-V HBM).
Technical Context
The SN74LXC1T45 implements a fully decoupled dual-rail architecture: A-port I/O and DIR control are referenced to VCCA, while B-port I/O is referenced to VCCB - enabling true asynchronous level shifting without shared reference constraints. Its internal logic uses Schmitt-trigger input stages on all data and control pins, ensuring reliable operation with slow edges or noisy signals.
Directional data flow is controlled solely by the DIR signal (high = A→B, low = B→A), with no internal latching or clocking. The device incorporates VCC isolation: if either VCCA or VCCB falls below ~100 mV, all I/Os enter high-impedance state after being pulled down - a critical feature for hot-swap and multi-voltage domain power sequencing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Voltage Range (VCCA/VCCB) | 1.1 V to 5.5 V per rail - enables direct interface between sub-1.2 V logic (e.g., modern MCUs) and legacy 3.3/5 V peripherals. |
| Max Data Rate | 420 Mbps (3.3 V → 5.0 V) - supports high-speed serial control links like I²C fast-mode+, GPIO expansion, and sensor interface backplanes. |
| Propagation Delay (tpd) | 1 ns min / 15 ns typ (VCCA = VCCB = 3.3 V, –40°C to 85°C) - ensures timing-critical bidirectional handshaking meets sub-20 ns budgets. |
| Ioff-float Current | ≤2.5 µA at –40°C to 125°C - guarantees safe high-Z state during power loss, preventing backfeeding or latch-up in powered-down subsystems. |
| ESD Protection | ±4000 V HBM, ±1000 V CDM - exceeds JEDEC JESD22-A114 and A101 requirements for industrial and automotive board-level robustness. |
| Operating Temperature | –40°C to +125°C - qualified for under-hood automotive, industrial motor drives, and outdoor edge computing deployments. |
| Supply Current (ICC) | 3 µA max at 25°C - enables always-on level-shifting in battery-backed systems without measurable quiescent drain. |
Pinout & Package
SN74LXC1T45DCKR is packaged in SC70-6 (DCK) with nominal body size 2.00 mm × 1.25 mm and 0.65 mm pitch. This ultra-compact package supports high-density PCB layouts in space-constrained applications such as wearables and portable instrumentation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCCA | A-port supply rail | Reference for A I/O and DIR control logic; must be stable within 1.1–5.5 V during operation. |
| VCCB | B-port supply rail | Reference for B I/O only; independent of VCCA - enables true bidirectional voltage translation. |
| GND | Common ground reference | Single ground connection required; no separate analog/digital GND - simplifies layout in mixed-voltage systems. |
| A | Bidirectional data I/O (A side) | Connects to 1.1–5.5 V logic domain referenced to VCCA; includes integrated dynamic pull-down. |
| DIR | Direction control input | Referenced to VCCA; high = A→B, low = B→A; includes static pull-down for floating-input tolerance. |
| B | Bidirectional data I/O (B side) | Connects to 1.1–5.5 V logic domain referenced to VCCB; includes integrated dynamic pull-down. |
Key Features
| Feature | Design Value |
|---|---|
| Schmitt-trigger inputs on all pins | Enables reliable operation with slow-rise/fall signals (e.g., mechanical switches, long traces) without external hysteresis components. |
| Integrated dynamic pull-down resistors on I/Os | Eliminates need for external 10–100 kΩ pull-downs on A/B lines - reduces BOM count and PCB area in GPIO-expansion designs. |
| Static pull-down on DIR input | Permits unconnected DIR pin to default to low (B→A mode) - simplifies firmware initialization and supports hardware-defined default direction. |
| VCC isolation with Ioff-float | When VCCA or VCCB < 100 mV, I/Os first pull down then go high-Z - prevents current leakage and bus contention during brown-out or hot-plug events. |
| Robust power supply sequencing | No power-up order dependency between VCCA and VCCB - eliminates need for complex power-rail supervisors in multi-voltage systems. |
Applications
| Industrial Sensor Interface | Automotive Body Control Module |
|---|---|
Use Scenario: Interfacing a 1.8 V microcontroller GPIO to a 5 V analog front-end ADC with shared bidirectional control bus. IC Role / Device Role / Timing Role: Bidirectional level translator managing clock, data, and chip-select lines between mismatched voltage domains. Use Value: Eliminates discrete resistor-divider networks and ensures sub-20 ns propagation delay for real-time sampling synchronization. | Use Scenario: Connecting a 3.3 V CAN controller to a 5 V dashboard display driver over a shared I²C-compatible control bus. IC Role / Device Role / Timing Role: Voltage translator enabling bidirectional register read/write while maintaining I²C timing compliance at 400 kHz. Use Value: Prevents bus contention during MCU reset sequences via Ioff-float, and withstands automotive load-dump transients due to ±4000-V HBM rating. |
| Wearable Health Monitor | Programmable Logic I/O Expansion |
Use Scenario: Level-shifting between a 1.2 V ultra-low-power sensor hub and a 3.3 V Bluetooth radio module. IC Role / Device Role / Timing Role: Low-quiescent translator supporting always-on sensor polling with <3 µA ICC at 25°C. Use Value: Extends battery life by eliminating standby current from external level-shifters and enabling direct 1.2 V logic compatibility. | Use Scenario: Adding isolated GPIO capability to an FPGA I/O bank operating at 2.5 V while interfacing to external 1.8 V peripherals. IC Role / Device Role / Timing Role: Configurable transceiver providing direction-controlled, high-drive (32 mA) I/O expansion with no external buffers. Use Value: Delivers 32 mA drive strength at 2.5 V - sufficient to directly drive LEDs or small relays without discrete drivers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional level translation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TXS0101DCKR | Lower max data rate (60 Mbps), no Schmitt-trigger inputs, higher ICC (10 µA typical), lacks Ioff-float | Not suitable for noisy environments or hot-swap scenarios requiring true high-Z isolation | Choose TXS0101DCKR only when cost is primary constraint and system operates strictly within 1.65–5.5 V with clean signals. |
| SN74AXC1T45DCKR | Higher speed (up to 500 Mbps), lower input threshold (0.18×VCCI), improved noise margin at low VCC, same pinout and thermal profile | Direct upgrade path for next-gen designs requiring >420 Mbps or sub-1.2 V compatibility | SN74AXC1T45DCKR is recommended for new designs targeting future-proof performance and extended low-voltage operation. |
Compared with TXS0101DCKR, SN74LXC1T45DCKR delivers 7× higher data rate, guaranteed noise immunity via Schmitt triggers, and fail-safe Ioff-float behavior - making it superior for industrial and automotive use. Against SN74AXC1T45DCKR, it trades marginal speed for broader legacy compatibility and identical footprint.
Availability
SN74LXC1T45DCKR is available at Aetrix Electronics and suitable for industrial sensor interfaces, automotive body control modules, wearable health monitors, and programmable logic I/O expansion requiring stable component supply and long-term lifecycle support.
Supply support for SN74LXC1T45DCKR 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 delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and personal electronics markets.
The SN74LXC1T45 belongs to TI's LXC logic family - designed specifically for low-voltage, high-noise-margin, dual-supply level translation in space- and power-constrained applications where reliability across wide temperature and supply ranges is critical.
FAQ
What is the minimum operating voltage for SN74LXC1T45DCKR on each supply rail?
The SN74LXC1T45DCKR supports VCCA and VCCB independently from 1.1 V to 5.5 V. Both rails may operate at their minimum 1.1 V simultaneously, and the device remains fully functional with guaranteed timing and logic thresholds - verified per TI's SCES934A datasheet Section 6.3.
Does SN74LXC1T45DCKR require external pull-up or pull-down resistors on its I/O pins?
No. The SN74LXC1T45DCKR integrates dynamic pull-down resistors on both A and B I/O pins, and a static pull-down on the DIR input. These eliminate the need for external resistors in most configurations - confirmed in Section 1 "Features" and Table 5-1 of the official datasheet.
How does SN74LXC1T45DCKR behave when one supply rail is disconnected?
When either VCCA or VCCB drops below ~100 mV, the SN74LXC1T45DCKR activates its Ioff-float feature: all I/Os are first pulled down, then transition to high-impedance. This prevents backfeeding and bus contention - a defined behavior in Section 1 and Section 8.3 of the SN74LXC1T45 datasheet.
What is the maximum data rate supported by SN74LXC1T45DCKR in 1.8 V to 3.3 V translation?
In 1.8 V → 3.3 V up-translation, the SN74LXC1T45DCKR supports up to 210 Mbps (Section 6.12, TMAX table). This is validated across –40°C to 125°C with 50% duty cycle input and defined pulse amplitude thresholds.
Is SN74LXC1T45DCKR compatible with legacy LVC-family level shifters?
Yes. The SN74LXC1T45DCKR is explicitly stated in Section 1 "Features" to be compatible with LVC-family level shifters - sharing pinout, logic behavior, and electrical characteristics that allow drop-in replacement in many existing LVC-based designs, subject to voltage and speed validation.
SN74LXC1T45DCKR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Translator Type:
- Voltage Level
- Channel Type:
- Bidirectional
- Number of Circuits:
- 1
- Channels per Circuit:
- 1
- Voltage - VCCA:
- 1.1 V ~ 5.5 V
- Voltage - VCCB:
- 1.1 V ~ 5.5 V
- Input Signal:
- -
- Output Signal:
- -
- Output Type:
- Non-Inverted
- Data Rate:
- 420Mbps
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Features:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-TSSOP, SC-88, SOT-363
SN74LXC1T45DCKR FAQ
1.How can I place an order for SN74LXC1T45DCKR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LXC1T45DCKR 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 SN74LXC1T45DCKR reliable?
The price and inventory of SN74LXC1T45DCKR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LXC1T45DCKR is usually 5 days.
3.What payment methods are accepted for SN74LXC1T45DCKR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LXC1T45DCKR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LXC1T45DCKR?
SN74LXC1T45DCKR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LXC1T45DCKR 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 SN74LXC1T45DCKR?
For technical support, including SN74LXC1T45DCKR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LXC1T45DCKR requirements.
6.How does Aetrix verify that SN74LXC1T45DCKR is sourced from the original manufacturer or authorized distributors?
All SN74LXC1T45DCKR 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 SN74LXC1T45DCKR meets industry standards.
7.What is the process for return or replacement of SN74LXC1T45DCKR?
All SN74LXC1T45DCKR units undergo pre-shipment inspection (PSI). If there is an issue with SN74LXC1T45DCKR, 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 SN74LXC1T45DCKR part is unused and in its original packaging.
Return procedure for SN74LXC1T45DCKR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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