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Texas Instruments SN74LVC8T245PW
- Part No.:
- SN74LVC8T245PW
- Manufacturer:
- Texas Instruments
- Package:
- 24-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74LVC8T245PW.pdf
- Description:
- IC TRANSLATION TXRX 5.5V 24TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,844
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Product details
Overview
SN74LVC8T245 from Texas Instruments is an 8-bit dual-supply non-inverting bus transceiver enabling bidirectional voltage-level translation between 1.65V and 5.5V domains. It features independent VCCA and VCCB rails, 3-state outputs controlled by DIR and OE pins referenced to VCCA, and Ioff support for partial-power-down operation. It is used in mixed-voltage system interconnects such as 1.8V microcontrollers interfacing with 3.3V or 5V peripherals.
For engineers reviewing the SN74LVC8T245 datasheet, SN74LVC8T245 pinout, SN74LVC8T245 application, or SN74LVC8T245 equivalent, key selection considerations include configurable dual-rail operation, glitch-free power sequencing, VCC isolation behavior, high-impedance output control timing, and compatibility with 1.8V/2.5V/3.3V/5V node translation in industrial PLCs, flat-panel monitors, and network-attached storage systems.
Technical Context
The SN74LVC8T245 implements asynchronous bidirectional data flow using a direction-control (DIR) signal referenced to VCCA and an output-enable (OE) signal also referenced to VCCA. Its dual-rail architecture allows A-port I/Os to track VCCA (1.65V–5.5V) and B-port I/Os to track VCCB (1.65V–5.5V), enabling translation across any combination of those voltages without level-shifter ICs.
VCC isolation ensures all I/Os enter high-impedance state if either VCCA or VCCB falls below 100 mV or floats; Ioff limits leakage current to ±2 µA during partial power-down. Propagation delays range from 0.3 ns to 23.8 ns depending on supply and load conditions, with tPHZ/tPLZ up to 32.2 ns at worst-case VCCA=1.8V/VCCB=1.8V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCCA / VCCB Range | 1.65V to 5.5V each - enables translation between 1.8V, 2.5V, 3.3V, and 5V logic domains without external biasing. |
| Max Output Drive | ±32 mA at 5V - supports driving moderate capacitive loads or parallel outputs for higher current capability. |
| Ioff Leakage | ±2 µA max - prevents damaging backflow current when one supply is powered down while the other remains active. |
| Propagation Delay | 0.3 ns to 23.8 ns - varies with VCCA/VCCB combinations; critical for timing-critical bus interfaces like memory or peripheral expansion. |
| ESD Rating | ±4000V HBM - meets industrial-grade robustness requirements for handling during assembly and field operation. |
| Operating Temperature | –40°C to +85°C - qualified for extended industrial environments including CNC controllers and ultrasound scanners. |
| Input Capacitance | Ci = 5 pF (control), Cio = 10 pF (I/O) - low loading minimizes signal integrity impact on high-speed buses. |
Pinout & Package
TSSOP-24 package (PW), 7.8 mm × 6.4 mm footprint, 0.65 mm pitch, thermally enhanced with exposed pad not present in PW variant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCCA (Pin 1) | Power supply for A-port logic and control inputs | Supplies DIR, OE, and A1–A8; VIH/VIL thresholds scale with this rail. |
| DIR (Pin 2) | Direction control input | High enables A→B data flow; low enables B→A; referenced to VCCA. |
| A1–A8 (Pins 3–10) | Bidirectional I/Os for A-side bus | Track VCCA voltage; must be driven HIGH/LOW-not left floating-to avoid excess ICC. |
| GND (Pins 11,12,13) | Ground reference | Three dedicated ground pins reduce ground bounce and improve noise immunity. |
| B8–B1 (Pins 14–21) | Bidirectional I/Os for B-side bus | Track VCCB voltage; functionally identical to A-port but electrically isolated. |
| OE (Pin 22) | Output enable input | High places both A and B ports in high-impedance state; referenced to VCCA. |
| VCCB (Pins 23,24) | Power supply for B-port I/Os | Dual VCCB pins lower impedance and improve current delivery to B-side drivers. |
Key Features
| Feature | Design Value |
|---|---|
| Configurable dual-rail operation | Independent VCCA and VCCB supplies allow simultaneous use of 1.8V, 2.5V, 3.3V, and 5V logic domains on same device. |
| VCC isolation & disconnect | Automatically forces all I/Os into high-impedance state if either VCCA or VCCB drops below 100 mV or floats-prevents bus contention during power sequencing. |
| Glitch-free power sequencing | Eliminates false transitions on I/Os regardless of VCCA/VCCB ramp order-critical for reliable boot-up in multi-rail systems. |
| Ioff partial-power-down support | Blocks current backflow when powered down, enabling safe hot-swap or sleep-mode operation in battery-backed subsystems. |
| Robust ESD protection | 4000V HBM and 1000V CDM ratings ensure reliability in manufacturing and end-equipment handling environments. |
Applications
| Industrial PLC Interface | Flat-Panel Monitor Control |
|---|---|
Use Scenario: Connecting a 3.3V ARM-based PLC CPU to legacy 5V I/O modules via parallel bus. IC Role / Device Role / Timing Role: Bidirectional voltage translator managing data flow direction and isolating domains during power transitions. Use Value: Eliminates need for discrete level shifters and reduces PCB area while ensuring glitch-free communication during cold/warm restarts. | Use Scenario: Interfacing a 1.8V video processor to 3.3V display timing controller and EDID EEPROM in sound bar or monitor. IC Role / Device Role / Timing Role: Level-translating control and status signals (e.g., I²C-like sideband, GPIO, interrupt lines) between voltage domains. Use Value: Maintains signal integrity across mixed-voltage subassemblies without adding propagation delay skew or requiring external pull-ups per rail. |
| Network-Attached Storage Bus | Ultrasound Scanner Data Path |
Use Scenario: Bridging a 2.5V SATA controller to 3.3V flash memory interface in embedded NAS hardware. IC Role / Device Role / Timing Role: High-drive 8-bit transceiver enabling fast burst-mode transfers with precise 3-state control timing. Use Value: Supports >20 MHz sustained data rates with <24 ns max propagation delay and low capacitive loading (≤10 pF per I/O). | Use Scenario: Routing real-time sensor data from 5V analog front-end ADCs to 3.3V digital processing FPGA in portable ultrasound equipment. IC Role / Device Role / Timing Role: Isolating high-noise analog domain from sensitive digital logic while translating voltage levels and enabling clean shutdown sequencing. Use Value: VCC isolation prevents data corruption during partial power-down of analog section, meeting medical-grade reliability requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74AVC8T245 | Supports 1.2V–3.6V rails only; faster tPD (0.2 ns min); no VCC isolation below 100 mV. | Optimized for ultra-low-voltage mobile SoC interconnects; unsuitable for 5V domain translation. | Select when operating exclusively below 3.6V and requiring sub-nanosecond timing margins. |
| TXB0108 | Auto-direction sensing; no DIR pin; supports 1.2V–3.6V; higher Ioff (±5 µA); no VCC disconnect feature. | Used where direction is inferred from data flow (e.g., I²C, UART), not externally controlled. | Choose for simple, direction-agnostic translation; avoid when deterministic DIR control or 5V compatibility is required. |
Compared with SN74AVC8T245 and TXB0108, the SN74LVC8T245 uniquely supports full 1.65V–5.5V dual-rail operation with guaranteed VCC isolation and explicit DIR/OE control-making it the only option for robust 5V-tolerant industrial bus bridging with power sequencing safety.
Availability
SN74LVC8T245 is available at Aetrix Electronics and suitable for industrial PLC controllers, flat-panel monitor subsystems, and network-attached storage designs requiring stable component supply, long-term lifecycle support, and verified mixed-voltage interoperability.
Supply support for SN74LVC8T245 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 consumer applications.
The SN74LVC8T245 belongs to TI's LVC logic family, designed specifically for robust, low-voltage bidirectional bus translation in mixed-supply systems where power sequencing integrity and wide voltage compatibility are essential.
FAQ
What voltage ranges does the SN74LVC8T245 support on its A and B ports?
The SN74LVC8T245 supports 1.65V to 5.5V on both VCCA (A port) and VCCB (B port), enabling translation between any pair of standard logic voltages: 1.8V ↔ 2.5V, 1.8V ↔ 3.3V, 1.8V ↔ 5V, 2.5V ↔ 3.3V, 2.5V ↔ 5V, and 3.3V ↔ 5V. This full-range compatibility is confirmed in Section 5.3 Recommended Operating Conditions of the SN74LVC8T245 datasheet.
How does the SN74LVC8T245 handle power sequencing when VCCA and VCCB are powered up at different times?
The SN74LVC8T245 provides glitch-free power sequencing: either VCCA or VCCB may be powered on or off in any order without causing erroneous output transitions. This behavior is enabled by internal circuitry that holds I/Os in defined states during rail transitions, as documented in Section 7.3.3 of the SN74LVC8T245 datasheet and validated per JESD78 latch-up testing.
What happens to the outputs of the SN74LVC8T245 when one supply rail is disconnected?
When either VCCA or VCCB falls below 100 mV or is left floating, the SN74LVC8T245 activates its VCC isolation feature: all A- and B-port outputs are disabled and enter a high-impedance state. This prevents bus contention and is specified in Section 7.3.5 and Table 7-1 of the SN74LVC8T245 datasheet.
Can the SN74LVC8T245 be used in partial-power-down mode, and how is it implemented?
Yes-the SN74LVC8T245 supports partial-power-down via its Ioff feature. When either VCCA or VCCB is at 0 V, the Ioff circuitry disables all I/Os, limiting leakage current to ±2 µA maximum. This protects downstream devices from backflow current and is characterized in Section 5.6 Electrical Characteristics of the SN74LVC8T245 datasheet.
What are the timing implications of using OE and DIR control signals referenced to VCCA?
Because OE and DIR are referenced to VCCA, their valid logic thresholds (VIH/VIL) scale with VCCA voltage per JEDEC standards-e.g., VIH ≥ VCCA × 0.65 at 1.65V–1.95V. This ensures reliable control activation across the full 1.65V–5.5V VCCA range and is explicitly defined in Section 5.3 of the SN74LVC8T245 datasheet.
SN74LVC8T245PW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVC
- Package/Case:
- 24-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Logic Type:
- Translation Transceiver
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 32mA, 32mA
- Voltage - Supply:
- 1.65V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-TSSOP
SN74LVC8T245PW FAQ
1.How can I place an order for SN74LVC8T245PW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVC8T245PW 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 SN74LVC8T245PW reliable?
The price and inventory of SN74LVC8T245PW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVC8T245PW is usually 5 days.
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SN74LVC8T245PW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVC8T245PW 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 SN74LVC8T245PW?
For technical support, including SN74LVC8T245PW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVC8T245PW requirements.
6.How does Aetrix verify that SN74LVC8T245PW is sourced from the original manufacturer or authorized distributors?
All SN74LVC8T245PW 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 SN74LVC8T245PW meets industry standards.
7.What is the process for return or replacement of SN74LVC8T245PW?
All SN74LVC8T245PW units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVC8T245PW, 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 SN74LVC8T245PW part is unused and in its original packaging.
Return procedure for SN74LVC8T245PW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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