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Texas Instruments SN74LVC8T245DGVR
- Part No.:
- SN74LVC8T245DGVR
- Manufacturer:
- Texas Instruments
- Package:
- 24-TFSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74LVC8T245DGVR.pdf
- Description:
- IC TRANSLATION TXRX 5.5V 24TVSOP
- Quantity:
- Payment:
- Shipping:
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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 interconnects such as 1.8V microcontroller-to-5V peripheral interfaces in flat-panel monitors and industrial PLCs.
For engineers reviewing the SN74LVC8T245 datasheet, SN74LVC8T245 pinout, SN74LVC8T245 application, or SN74LVC8T245 equivalent, key selection criteria include configurable dual-rail operation (1.65V–5.5V per port), VCC isolation behavior, glitch-free power sequencing, and verified 32mA output drive at 5V.
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 1.8V/2.5V/3.3V/5V nodes without external level-shifting components.
It integrates VCC isolation logic that forces all I/Os into high-impedance when either VCCA or VCCB falls below 100mV or floats, and supports partial-power-down via Ioff circuitry limiting leakage to ±2μA per I/O. Control inputs are immune to supply sequencing order, eliminating startup glitches on data lines.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCCA / VCCB Range | 1.65V to 5.5V each - enables direct translation between 1.8V, 2.5V, 3.3V, and 5V logic domains without external components |
| Output Drive (IOH/IOL) | ±32mA at 5V - supports driving moderate capacitive loads and parallel outputs for higher current capability |
| Propagation Delay (tPLH/tPHL) | 0.3ns to 23.8ns - varies with VCCA/VCCB combination; minimum 0.3ns at 5V→5V ensures timing-critical interface compatibility |
| Ioff Leakage | ±2μA max - prevents damaging backflow current during partial power-down, critical for hot-swap and battery-backed systems |
| ESD Rating (HBM) | ±4000V - exceeds JEDEC JESD22-A114, enabling robust handling in manufacturing and field deployment |
| Operating Temperature | –40°C to +85°C - qualified for industrial and consumer electronics environments including CNC controllers and sound bars |
| VIH/VIL (Control Inputs) | VCCA-referenced thresholds - eliminates need for level-shifted control signals; VIH min = VCCA × 0.7, VIL max = VCCA × 0.3 |
Pinout & Package
SN74LVC8T245DGVR uses a 24-pin TVSOP (DGV) package measuring 5.0mm × 6.4mm, optimized for high-density PCB layouts. The package includes exposed thermal pad only in RHL variant; DGV has no thermal pad.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCCA (Pin 1) | Power supply for A-port logic and control inputs | Supplies DIR, OE, and all A-side I/Os; defines VIH/VIL thresholds for control signals |
| DIR (Pin 2) | Direction control input | High = A→B data flow; Low = B→A; referenced to VCCA, not VCCB |
| A1–A8 (Pins 3–10) | A-port bidirectional I/Os | Track VCCA voltage; must be driven HIGH/LOW (no floating) to prevent excess ICCZ |
| GND (Pins 11–13) | Ground reference | Three dedicated GND pins reduce ground bounce and improve noise immunity in high-speed switching |
| B8–B1 (Pins 14–21) | B-port bidirectional I/Os | Track VCCB voltage; electrically isolated from A-port except through transceiver logic |
| OE (Pin 22) | Output-enable control input | High = all outputs high-Z; Low = outputs active per DIR state; referenced to VCCA |
| VCCB (Pins 23–24) | Power supply for B-port logic | Independent of VCCA; enables true dual-voltage domain operation |
Key Features
| Feature | Design Value |
|---|---|
| Fully configurable dual-rail operation | VCCA and VCCB independently set from 1.65V to 5.5V - eliminates need for discrete level shifters in multi-voltage SoC subsystems |
| VCC isolation & disconnect | Automatic high-impedance output disable if either VCCA or VCCB <100mV or floating - prevents bus contention during power sequencing |
| Glitch-free power supply sequencing | No defined ramp order required for VCCA/VCCB - avoids false data transitions during power-up/down in industrial controllers |
| Ioff partial-power-down support | Leakage limited to ±2μA per I/O when powered down - enables safe integration in battery-backed or hot-pluggable modules |
| Robust ESD protection | ±4000V HBM and ±1000V CDM - meets IPC/JEDEC requirements for automated assembly and end-equipment reliability |
Applications
| Industrial PLC Interface | Flat-Panel Monitor Logic Bridge |
|---|---|
Use Scenario: Interfacing a 3.3V ARM-based motion controller with legacy 5V I/O modules in programmable logic controllers. IC Role / Device Role / Timing Role: Bidirectional voltage translator managing real-time digital I/O handshaking between mismatched voltage domains. Use Value: Eliminates discrete resistor-divider or MOSFET-based level shifters, reducing BOM count and layout area while maintaining sub-10ns propagation delay. |
Use Scenario: Connecting a 1.8V video processor to 5V timing controller and display driver ICs in sound bar and monitor designs. IC Role / Device Role / Timing Role: Synchronous data bridge enabling pixel clock, DE, and RGB data transfer across voltage boundaries. Use Value: Supports 2.5MHz+ video data rates with guaranteed monotonic edges and no startup glitches during display initialization. |
| Network-Attached Storage Controller | Data Center Switch Management Bus |
Use Scenario: Isolating 3.3V SoC management logic from 5V SATA PHY and power sequencing circuits in NAS enclosures. IC Role / Device Role / Timing Role: Level-translating control bus (I²C/SMBus) while providing VCCB-initiated isolation during drive insertion/removal. Use Value: Prevents bus lockup during hot-swap events via automatic high-Z transition when VCCB drops below 100mV. |
Use Scenario: Translating GPIO and status signals between 2.5V baseband unit FPGAs and 3.3V switch fabric management ASICs. IC Role / Device Role / Timing Role: Asynchronous signal conditioner ensuring clean edge integrity across mixed-voltage backplane monitoring paths. Use Value: Delivers <1ns skew between channels and withstands repeated 4kV ESD events on field-deployed equipment. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74AVC8T245RHLR | VQFN-24 (5.5mm × 3.5mm); supports 1.2V–3.6V range; lower static current (10μA vs 12μA) | Targeted for space-constrained portable devices; lacks 5V tolerance on B-port | Choose for ultra-dense layouts requiring <1.2V logic compatibility; not drop-in for 5V B-side use. |
| TXB0108PWR | Auto-direction sensing; single-supply (1.2V–3.6V); no DIR pin; higher capacitance (10pF vs 8.5pF) | Eliminates direction-control wiring but adds latency (~20ns extra); unsuitable for synchronous bidirectional protocols | Prefer for simple GPIO expansion where direction is predictable; avoid for DDR, SPI, or time-critical buses. |
Compared with SN74LVC8T245DGVR, SN74AVC8T245RHLR offers smaller footprint and lower voltage support but sacrifices 5V B-port compatibility, while TXB0108PWR removes DIR complexity at the cost of deterministic timing and 5V operation - making SN74LVC8T245DGVR the optimal choice for industrial and computing applications demanding full 1.65V–5.5V dual-rail flexibility and precise control.
Availability
SN74LVC8T245DGVR is available at Aetrix Electronics and suitable for industrial PLCs, flat-panel monitor logic bridges, network-attached storage controllers, data center switch management buses, and enterprise computing interconnects requiring stable component supply across extended product lifecycles.
Supply support for SN74LVC8T245DGVR 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 logic ICs.
The SN74LVC8T245 belongs to TI's LVC logic family, designed specifically for low-voltage, high-speed bidirectional interfacing in mixed-supply systems - targeting industrial automation, consumer displays, and enterprise infrastructure where voltage translation reliability is critical.
FAQ
What voltage ranges does the SN74LVC8T245DGVR support on its A and B ports?
The SN74LVC8T245DGVR supports independent supply voltages from 1.65V to 5.5V on both VCCA (A port) and VCCB (B port). This enables translation between any combination of 1.8V, 2.5V, 3.3V, and 5V logic domains. The A-port I/Os track VCCA, and B-port I/Os track VCCB - confirmed in Section 5.3 Recommended Operating Conditions and Figure 7-1 of the SCES584D datasheet.
How does the SN74LVC8T245DGVR handle power sequencing when VCCA and VCCB are powered up at different times?
The SN74LVC8T245DGVR features glitch-free power supply 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 outputs stable during rail transitions - explicitly documented in Feature 2 and Section 7.3.3 of the datasheet.
What happens to the outputs of the SN74LVC8T245DGVR if one supply rail is disconnected or falls below 100mV?
If either VCCA or VCCB drops below 100mV or is left floating, the SN74LVC8T245DGVR activates its VCC isolation feature, forcing all A- and B-port outputs into a high-impedance state. This prevents bus contention and protects downstream devices - specified in Feature 4 and Section 7.3.5 of the SCES584D datasheet.
Can unused I/O pins on the SN74LVC8T245DGVR be left floating?
No - all unused A- and B-port I/O pins on the SN74LVC8T245DGVR must be actively driven HIGH or LOW (preferably to VCCA, VCCB, or GND) to ensure proper device operation and minimize ICCZ. Floating I/Os increase quiescent current and risk metastability; this requirement is stated in Section 5.3 Note (3) and Section 8.1 Application Information.
What is the maximum output drive strength of the SN74LVC8T245DGVR, and at which supply voltage is it achieved?
The SN74LVC8T245DGVR delivers up to ±32mA output drive strength per pin when both VCCA and VCCB are set to 4.5V–5.5V, as verified in Section 5.3 IOH/IOL specifications. This high drive capability supports driving multiple loads or paralleling outputs for increased current - critical for driving terminated buses or capacitive display interfaces.
SN74LVC8T245DGVR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVC
- Package/Case:
- 24-TFSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- 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-TVSOP
SN74LVC8T245DGVR FAQ
1.How can I place an order for SN74LVC8T245DGVR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVC8T245DGVR 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 SN74LVC8T245DGVR reliable?
The price and inventory of SN74LVC8T245DGVR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVC8T245DGVR is usually 5 days.
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Once your SN74LVC8T245DGVR 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 SN74LVC8T245DGVR?
For technical support, including SN74LVC8T245DGVR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVC8T245DGVR requirements.
6.How does Aetrix verify that SN74LVC8T245DGVR is sourced from the original manufacturer or authorized distributors?
All SN74LVC8T245DGVR 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 SN74LVC8T245DGVR meets industry standards.
7.What is the process for return or replacement of SN74LVC8T245DGVR?
All SN74LVC8T245DGVR units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVC8T245DGVR, 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 SN74LVC8T245DGVR part is unused and in its original packaging.
Return procedure for SN74LVC8T245DGVR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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