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Texas Instruments SN74LXC8T245DGSR
- Part No.:
- SN74LXC8T245DGSR
- Manufacturer:
- Texas Instruments
- Package:
- 24-TFSOP (0.118", 3.00mm Width)
- Datasheet:
-
SN74LXC8T245DGSR.pdf
- Description:
- 8-BIT DUAL-SUPPLY BUS TRANSCEIVE
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SN74LXC8T245DGSR from Texas Instruments is an 8-bit dual-supply noninverting bidirectional bus transceiver with configurable level shifting, 3-state outputs, Schmitt-trigger inputs, and VCC isolation. It operates with independent A-port (VCCA) and B-port (VCCB) supplies from 1.1 V to 5.5 V, supports up to 420 Mbps in 3.3 V → 5.0 V translation, and delivers ±32 mA drive at 5 V. It is used in mixed-voltage UART/SPI/JTAG interconnects between legacy and modern SoCs.
For engineers reviewing the SN74LXC8T245DGSR datasheet, SN74LXC8T245DGSR pinout, SN74LXC8T245DGSR application, or SN74LXC8T245DGSR equivalent, key selection criteria include dual-rail voltage range compatibility, Ioff-float behavior during partial power-down, propagation delay under asymmetric supply conditions (e.g., VCCA = 1.8 V / VCCB = 3.3 V), and thermal performance in VSSOP-24 packaging.
Technical Context
This device implements a fully configurable dual-rail architecture where DIR and OE control logic is referenced solely to VCCA, while Ax I/Os track VCCA and Bx I/Os track VCCB. Its Schmitt-trigger inputs tolerate slow edges and noise, and integrated dynamic pull-down resistors on I/Os plus static pull-downs on DIR/OE eliminate external biasing components.
The VCC isolation feature ensures that if either VCCA or VCCB falls below 100 mV or disconnects, all I/Os first pull down then enter high-impedance state-enabling safe hot-plug and partial-power-down operation without bus contention. The Ioff-float specification guarantees ≤2.5 µA leakage per port under floating-supply conditions across –40°C to +125°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Range (VCCA/VCCB) | 1.1 V to 5.5 V each - enables direct interface between 1.2 V logic and 5 V peripherals without external level-shifting circuitry. |
| Max Data Rate | 420 Mbps (3.3 V → 5.0 V) - supports high-speed serial protocols like UART, SPI, and JTAG in mixed-voltage systems. |
| Drive Strength | ±32 mA at 5 V - sufficient to directly drive LEDs, buzzers, or moderate-capacitance PCB traces without buffer stages. |
| Ioff-float Current | ≤2.5 µA (–40°C to +125°C) - ensures minimal leakage during partial power-down, critical for battery-backed or low-power sleep modes. |
| Propagation Delay | 2 ns (min) to 10 ns (max) at VCCA = 3.3 V / VCCB = 5.0 V - enables timing-critical bidirectional data transfers with predictable latency. |
| ESD Protection | ±4000 V HBM, ±1000 V CDM - meets industrial-grade robustness requirements for handling and board-level reliability. |
| Operating Temperature | –40°C to +125°C - qualified for automotive under-hood, industrial motor control, and outdoor embedded applications. |
Pinout & Package
VSSOP-24 (DGS) package: 6.10 mm × 3.00 mm body, 0.5 mm pitch, thermal pad (recommended grounded). Pin count: 24. Pin 1 = DIR, Pin 24 = VCCB (second instance); GND appears on Pins 11, 12, 13, and 22 is OE - layout supports compact routing and thermal dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCCA (Pin 24) | A-port supply reference | Supplies A-side logic and references DIR/OE control thresholds; must be stable before enabling outputs. |
| DIR (Pin 1) | Direction control input | High = A→B data flow; Low = B→A; referenced to VCCA - no external pull-up required due to integrated static pull-down. |
| OE (Pin 21) | Output enable input | Low = outputs active; High = all Ax/Bx in high-Z; referenced to VCCA - floating input defaults to disable state. |
| A1–A8 (Pins 2–9) | A-port bidirectional I/O | Each referenced to VCCA; Schmitt-triggered with dynamic pull-down - accepts slow/noisy signals without external RC filtering. |
| B1–B8 (Pins 14–20) | B-port bidirectional I/O | Each referenced to VCCB; supports independent voltage domain - enables seamless 1.8 V ↔ 3.3 V or 3.3 V ↔ 5 V translation. |
| VCCB (Pins 22, 23) | B-port supply reference | Dual VCCB pins reduce IR drop and improve noise immunity on B-side power distribution network. |
| GND (Pins 11, 12, 13) | Ground return | Three dedicated ground pins minimize ground bounce and support clean signal integrity for all 16 I/O channels. |
Key Features
| Feature | Design Value |
|---|---|
| Configurable dual-rail operation | Independent VCCA (1.1–5.5 V) and VCCB (1.1–5.5 V) allow arbitrary voltage pairing - e.g., 1.2 V MCU ↔ 5 V sensor without discrete translators. |
| VCC isolation with Ioff-float | When either supply drops below 100 mV, I/Os auto-enter high-Z - prevents backfeeding and bus contention during power sequencing or fault events. |
| Schmitt-trigger inputs | Hysteresis ≥0.2 V (up to 1.06 V) rejects noise and accommodates slow-switching mechanical inputs or long trace reflections. |
| Integrated pull-down resistors | Dynamic pull-downs on I/Os + static pull-downs on DIR/OE eliminate need for 10-kΩ external resistors - reduces BOM count and PCB area. |
| Low quiescent current | 4 µA max at 25°C (ICCA + ICCB) - suitable for always-on monitoring nodes and energy-harvesting systems with microamp budget constraints. |
Applications
| Industrial Sensor Interface | Automotive Body Control Module |
|---|---|
Use Scenario: Interfacing a 1.8 V ARM Cortex-M4 microcontroller to legacy 5 V analog sensor modules via SPI. IC Role / Device Role / Timing Role: Bidirectional level translator for SCLK, MOSI, MISO, and CS lines; DIR toggled per transfer direction; OE held low during active communication. Use Value: Eliminates four discrete level shifters, reduces layout complexity, and maintains <10 ns propagation skew across all four signal paths. |
Use Scenario: Connecting a 3.3 V infotainment SoC to 5 V HVAC actuators and 12 V CAN transceivers via GPIO-controlled status lines. IC Role / Device Role / Timing Role: Voltage translator for push-pull control signals (e.g., fan enable, valve open/close); DIR fixed; OE used for safe shutdown during ECU reset. Use Value: Ioff-float prevents backfeeding into powered-down domains; ±32 mA drive directly switches 5 V relay coils without external drivers. |
| IoT Edge Gateway | Test Equipment Signal Conditioning |
Use Scenario: Bridging 1.2 V FPGA I/O banks to 3.3 V Wi-Fi/BLE modules and 5 V USB-UART bridges in a compact gateway PCB. IC Role / Device Role / Timing Role: Configurable bus transceiver for multi-protocol expansion headers; VCCA = 1.2 V, VCCB = 3.3 V/5.0 V; DIR controlled by FPGA configuration state. Use Value: Single device replaces multiple fixed-ratio translators; Schmitt inputs tolerate marginal signal integrity from flex-cable interconnects. |
Use Scenario: Level-shifting DUT signals between 1.65 V LVCMOS test patterns and 5 V TTL-compatible instrumentation inputs. IC Role / Device Role / Timing Role: Precision bidirectional translator in automated test fixture; VCCA = 1.65 V, VCCB = 5.0 V; propagation delay tightly bounded (±0.5 ns skew). Use Value: Enables accurate timing capture of sub-ns edge transitions; low Cio (≤10 pF) minimizes loading on high-frequency DUT outputs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional level translation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74AVC8T245RHLR | VQFN-24 (5.5 mm × 3.5 mm); higher speed (500 Mbps @ 3.3 V → 5 V); no Schmitt inputs; lower drive (±24 mA). | Better suited for space-constrained, high-density layouts where thermal pad grounding is feasible; lacks noise immunity for noisy environments. | Choose when footprint size and maximum throughput outweigh need for Schmitt-trigger noise rejection and higher drive strength. |
| TXB0108PWR | Auto-direction sensing (no DIR pin); 1.2 V–3.6 V only on both sides; lower max rate (100 Mbps); no Ioff-float. | Ideal for simple uni-directional or auto-sensed data flows (e.g., I²C), but cannot replace DIR-controlled bidirectional buses like SPI or parallel memory interfaces. | Select only for applications with strictly unidirectional or self-clocking protocols; not suitable for DIR-gated buses requiring precise direction control. |
Compared with SN74AVC8T245RHLR and TXB0108PWR, the SN74LXC8T245DGSR uniquely combines Schmitt-trigger noise immunity, 420 Mbps capability, full 1.1–5.5 V dual-rail flexibility, and guaranteed Ioff-float - making it the only option among the three qualified for mixed-voltage SPI with hot-plug resilience and industrial ESD robustness.
Availability
SN74LXC8T245DGSR is available at Aetrix Electronics and suitable for industrial sensor interfaces, automotive body control modules, IoT edge gateways, and test equipment signal conditioning requiring stable component supply and long-term production continuity.
Supply support for SN74LXC8T245DGSR 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 and embedded processing solutions, with over 90 years of innovation in precision analog, power management, and interface technologies.
The SN74LXC8T245 belongs to TI's LXC logic family, designed specifically for robust, low-power, mixed-voltage system interfacing in automotive, industrial, and communications infrastructure applications.
FAQ
What is the minimum operating voltage for SN74LXC8T245DGSR on either port?
The SN74LXC8T245DGSR supports VCCA and VCCB supply voltages as low as 1.1 V each. This allows direct interfacing with ultra-low-voltage processors (e.g., 1.2 V ARM cores) and emerging 1.1 V I/O standards without intermediate regulation or translation stages. Operation below 1.1 V is not specified and may result in undefined logic states or increased leakage.
Does SN74LXC8T245DGSR require external pull-up or pull-down resistors on DIR and OE pins?
No. The SN74LXC8T245DGSR integrates static pull-down resistors on both DIR and OE inputs, ensuring a defined low state when left unconnected. This eliminates the need for external biasing components, reducing bill-of-materials cost and PCB real estate - a key advantage in high-density designs.
How does the Ioff-float feature behave when VCCA is disconnected but VCCB remains powered?
When VCCA drops below 100 mV or is disconnected while VCCB remains active, the SN74LXC8T245DGSR pulls all A-port I/Os (A1–A8) low, then places them in high-impedance state. B-port I/Os remain functional and unaffected. This prevents back-driving the A-side supply rail and avoids bus contention in partial-power-down scenarios.
Can SN74LXC8T245DGSR translate between 1.8 V and 5 V at 420 Mbps?
No. The 420 Mbps rating applies only to 3.3 V → 5.0 V translation. For 1.8 V → 5.0 V, the maximum supported data rate is 200 Mbps (per Table 6.12). Translation speed depends on both supply voltages and direction; always consult the TMAX table in the datasheet for exact combinations.
What is the thermal pad connection recommendation for SN74LXC8T245DGSR in VSSOP-24 (DGS) package?
Texas Instruments recommends connecting the thermal pad of the SN74LXC8T245DGSR (DGS package) to a solid ground plane using ≥4 thermal vias (0.3 mm diameter, spaced evenly). This reduces θJB to 47.2°C/W and improves power dissipation capability - essential for sustained 32 mA output drive at elevated ambient temperatures.
SN74LXC8T245DGSR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LXC
- Package/Case:
- 24-TFSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Logic Type:
- Transceiver, Non-Inverting
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 32mA, 32mA
- Voltage - Supply:
- 1.08V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-VSSOP
SN74LXC8T245DGSR FAQ
1.How can I place an order for SN74LXC8T245DGSR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LXC8T245DGSR 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 SN74LXC8T245DGSR reliable?
The price and inventory of SN74LXC8T245DGSR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LXC8T245DGSR is usually 5 days.
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SN74LXC8T245DGSR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LXC8T245DGSR 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 SN74LXC8T245DGSR?
For technical support, including SN74LXC8T245DGSR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LXC8T245DGSR requirements.
6.How does Aetrix verify that SN74LXC8T245DGSR is sourced from the original manufacturer or authorized distributors?
All SN74LXC8T245DGSR 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 SN74LXC8T245DGSR meets industry standards.
7.What is the process for return or replacement of SN74LXC8T245DGSR?
All SN74LXC8T245DGSR units undergo pre-shipment inspection (PSI). If there is an issue with SN74LXC8T245DGSR, 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 SN74LXC8T245DGSR part is unused and in its original packaging.
Return procedure for SN74LXC8T245DGSR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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