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Texas Instruments SN74LVCC3245ANS
- Part No.:
- SN74LVCC3245ANS
- Manufacturer:
- Texas Instruments
- Category:
- Translators, Level Shifters
- Package:
- Datasheet:
-
SN74LVCC3245ANS.pdf
- Description:
- OCTAL BUS TRANSCEIVER WITH ADJUS
- Quantity:
- Payment:
- Shipping:
Inventory:5,304
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Product details
Overview
SN74LVCC3245A from Texas Instruments is an octal noninverting bus transceiver with dual-supply voltage translation (2.3V–3.6V on A port, 3V–5.5V on B port), 3-state outputs, and VCC isolation. It enables bidirectional level-shifting between 2.5V/3.3V and 5V domains in real-time data buses, supporting up to 24mA drive strength at 3V and operating across –40°C to 85°C.
For engineers reviewing the SN74LVCC3245A datasheet, SN74LVCC3245A pinout, SN74LVCC3245A application, or SN74LVCC3245A equivalent, this device delivers verified glitch-free power sequencing, Ioff partial-power-down protection, and robust ESD resilience (±2000V HBM) - critical for ultrasound scanners, string inverters, and SBC interconnects requiring reliable voltage-domain bridging.
Technical Context
The SN74LVCC3245A implements asynchronous bidirectional translation using independent VCCA and VCCB rails, with DIR-controlled directionality and OE-gated 3-state output enable. Control inputs (DIR, OE) are referenced strictly to VCCA, ensuring consistent logic thresholds regardless of VCCB voltage.
Its VCC isolation feature forces both A and B ports into high-impedance when either VCCA or VCCB drops below 100mV or floats, preventing backdrive and latch-up. The device meets JESD 17 latch-up immunity (>250mA) and supports full Ioff operation for safe partial power-down in mixed-voltage systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| A-port supply range | 2.3V to 3.6V - enables direct interface with 2.5V/3.3V logic without level-shifter ICs |
| B-port supply range | 3V to 5.5V - supports legacy 5V peripherals and industrial controllers |
| Max output drive | 24mA at 3V - drives heavier capacitive loads (e.g., long traces, multiple inputs) without external buffers |
| Propagation delay | 1ns to 9.4ns (A→B, VCCA=2.7–3.6V, VCCB=5V) - ensures timing-critical bus synchronization |
| ESD rating | ±2000V HBM - withstands handling and board-level electrostatic events per JESD22-A114 |
| Operating temperature | –40°C to +85°C - qualified for industrial and medical equipment environments |
| Ioff leakage | ±2μA max - prevents damaging current flow during power sequencing or standby |
Pinout & Package
SN74LVCC3245A is available in multiple 24-pin surface-mount packages including DB (SSOP), DW (SOIC), DBQ (SSOP), NS (SO), and PW (TSSOP). All variants share identical pin numbering and function mapping.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCCA | A-port power supply | Powers A-side I/O and control logic; defines VIH/VIL thresholds for DIR/OE |
| VCCB | B-port power supply | Powers B-side I/O; sets output voltage swing and input tolerance on B port |
| DIR | Direction control input | High = A→B data flow; Low = B→A data flow; referenced to VCCA |
| OE | Output enable (active low) | Low = transceiver enabled; High = all A/B I/Os enter high-Z state |
| A1–A8 | A-port bidirectional I/O | 8-bit data path tied to VCCA; tolerant to overvoltage up to VCCA+0.5V |
| B1–B8 | B-port bidirectional I/O | 8-bit data path tied to VCCB; tolerant to overvoltage up to VCCB+0.5V |
| GND | Ground reference | Common return for both supply domains; must be connected before power-up |
| NC | No internal connection | Pins 13 and 23 - electrically isolated; no routing or termination required |
Key Features
| Feature | Design Value |
|---|---|
| Dual-rail voltage translation | Enables seamless 2.5V↔3.3V↔5V interoperability without external resistors or discrete translators |
| Glitch-free power sequencing | Eliminates false data transitions during asymmetric VCCA/VCCB ramp-up/down - prevents peripheral misreads |
| VCC isolation | Automatically disables both ports into high-Z if either VCCA or VCCB falls below 100mV or floats |
| Ioff partial-power-down | Blocks back-current flow when one rail is powered off - protects live buses and avoids system lockup |
| Robust ESD protection | ±2000V HBM and ±1000V CDM - exceeds JEDEC standards for manufacturing and field reliability |
Applications
| Ultrasound Scanner | String Inverter |
|---|---|
Use Scenario: Interfacing low-voltage FPGA control logic (3.3V) with high-voltage analog front-end modules (5V) in real-time beamforming subsystems. IC Role / Device Role / Timing Role: Bidirectional voltage translator enabling synchronized data exchange between digital control and analog signal chain domains. Use Value: Eliminates timing skew and signal integrity loss caused by passive resistor-based level shifters, preserving sub-ns timing margins required for echo sampling. |
Use Scenario: Connecting microcontroller-based MPPT controllers (3.3V) to isolated gate drivers and sensor interfaces (5V) in photovoltaic DC-DC conversion stages. IC Role / Device Role / Timing Role: Level-translating bus transceiver managing command/status handshaking across voltage-isolated subsystem boundaries. Use Value: Prevents latch-up during startup/shutdown sequences where 5V rails stabilize later than 3.3V logic, ensuring deterministic initialization. |
| Central Inverter | Single Board Computer |
Use Scenario: Bridging ARM-based management processor (2.5V I/O) with CAN transceivers and power monitoring ASICs (5V) in grid-tied inverter control units. IC Role / Device Role / Timing Role: Octal transceiver providing isolated, direction-controlled data paths between heterogeneous voltage domains. Use Value: Supports hot-swap capability via Ioff and VCC isolation - allows firmware updates without powering down high-voltage sections. |
Use Scenario: Enabling communication between 3.3V SoC peripherals (eMMC, UART) and legacy 5V expansion headers or add-on modules on compact embedded SBCs. IC Role / Device Role / Timing Role: Voltage-agile bus interface IC facilitating plug-and-play compatibility with mixed-voltage accessories. Use Value: Reduces BOM count by replacing discrete MOSFET translators; maintains signal integrity at 100MHz+ data rates due to low propagation delay. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional level translation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74AVC8T245 | Single-supply (1.2V–3.6V), no VCCB rail; lacks 5V B-port support and VCC isolation | Suitable only for sub-3.6V domain bridging; cannot replace SN74LVCC3245A in 5V interfacing roles | Select when interfacing two low-voltage domains (e.g., 1.8V ↔ 3.3V) with tighter timing budgets (tPD < 4ns) |
| TXB0108 | Auto-direction sensing (no DIR pin); lower drive (±8mA); no VCC isolation or Ioff | Requires external pull-ups for direction detection; unsuitable for systems needing explicit DIR control or floating-rail safety | Prefer for simple I²C/SPI bridges where direction is predictable and 5V compatibility is unnecessary |
Compared with SN74LVCC3245A, SN74AVC8T245 offers faster switching but sacrifices 5V interoperability and rail-isolation safety, while TXB0108 simplifies control logic at the cost of deterministic direction control and robustness in partial-power-down scenarios.
Availability
SN74LVCC3245A is available at Aetrix Electronics and suitable for ultrasound scanner subsystems, solar string inverters, and single-board computer expansion interfaces requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for SN74LVCC3245A 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 connectivity technologies, with decades of expertise in high-reliability interface ICs.
The SN74LVCC3245A belongs to TI's LVCC logic family, engineered specifically for robust voltage-domain bridging in industrial, medical, and renewable energy systems where mixed-supply interoperability and fail-safe power sequencing are mandatory.
FAQ
What voltage ranges does the SN74LVCC3245A support on its A and B ports?
The SN74LVCC3245A supports 2.3V to 3.6V on the A port (VCCA) and 3V to 5.5V on the B port (VCCB). This allows bidirectional translation between common logic families such as 2.5V/3.3V microcontrollers and 5V peripherals. Both supply rails operate independently, and the device remains functional across the full specified range without derating.
How does the SN74LVCC3245A handle power sequencing when VCCA and VCCB are powered up at different times?
The SN74LVCC3245A features glitch-free power supply sequencing: either VCCA or VCCB may be powered on or off in any order without causing erroneous output transitions. Its internal architecture prevents false data pulses during ramp-up/down, eliminating risks of spurious resets or misconfigurations in downstream devices - a key advantage confirmed in TI's SCAS585R datasheet.
Does the SN74LVCC3245A provide protection when one supply rail is unpowered?
Yes. The SN74LVCC3245A includes VCC isolation: if either VCCA or VCCB drops below 100mV or is left floating, both A and B ports automatically enter a high-impedance state. Additionally, its Ioff circuitry limits leakage current to ±2μA, preventing damaging back-current flow - critical for hot-swap and partial-power-down use cases.
What is the maximum output drive strength of the SN74LVCC3245A, and under what conditions is it specified?
The SN74LVCC3245A delivers up to 24mA output drive strength per pin, specified at VCCA = 3V and VCCB = 3V for both high- and low-level outputs (IOH/ IOL). This enables direct driving of moderate capacitive loads (e.g., 10–15pF traces plus multiple CMOS inputs) without external buffers - verified in Section 5.3 and 5.5 of the official datasheet.
Can the SN74LVCC3245A be used in automotive applications?
The SN74LVCC3245A is rated for –40°C to +85°C operation and meets industrial reliability standards (JESD 17 latch-up, JESD 22 ESD), but it is not AEC-Q100 qualified. For automotive applications requiring qualification, designers should consult TI's automotive-grade alternatives or perform full system-level validation - the SN74LVCC3245A itself is intended for industrial, medical, and renewable energy systems per its official product folder and datasheet scope.
SN74LVCC3245ANS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVCC
- Package/Case:
- Packaging:
- Bulk
- Product Status:
- Active
- Translator Type:
- -
- Channel Type:
- -
- Number of Circuits:
- -
- Channels per Circuit:
- -
- Voltage - VCCA:
- -
- Voltage - VCCB:
- -
- Input Signal:
- -
- Output Signal:
- -
- Output Type:
- -
- Data Rate:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Features:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
SN74LVCC3245ANS FAQ
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6.How does Aetrix verify that SN74LVCC3245ANS is sourced from the original manufacturer or authorized distributors?
All SN74LVCC3245ANS 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 SN74LVCC3245ANS meets industry standards.
7.What is the process for return or replacement of SN74LVCC3245ANS?
All SN74LVCC3245ANS units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVCC3245ANS, 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 SN74LVCC3245ANS part is unused and in its original packaging.
Return procedure for SN74LVCC3245ANS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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