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Texas Instruments SN74ALVC245DW
- Part No.:
- SN74ALVC245DW
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74ALVC245DW.pdf
- Description:
- IC TXRX NON-INVERT 3.6V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:500
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Product details
Overview
SN74ALVC245DW from Texas Instruments is an octal bus transceiver with 3-state outputs, designed for bidirectional asynchronous data transfer between 1.65-V to 3.6-V buses. It features ±24-mA drive strength at 3.3 V, 3.4-ns max propagation delay, and operates across –40°C to 85°C. Used in level-shifting and bus isolation applications within industrial control backplanes and embedded system interconnects.
For engineers reviewing the SN74ALVC245DW datasheet, SN74ALVC245DW pinout, SN74ALVC245DW application, or SN74ALVC245DW equivalent, this page delivers verified functional identity, SOIC-20 package mapping, direction-controlled bidirectional operation, 3-state enable logic, and validated alternative options for bus interface redesigns.
Technical Context
The SN74ALVC245DW implements dual-rail CMOS logic with independent DIR and OE controls: DIR selects A→B or B→A data flow, while OE disables all outputs into high-impedance state. Its input thresholds scale with VCC (VIH = 0.65×VCC min at 1.65 V), enabling robust interfacing across mixed-voltage domains.
It meets JESD 17 latch-up immunity (>250 mA), supports hot-swap–compatible power sequencing via OE pull-up recommendation, and exhibits low dynamic power (Cpd = 30 pF at 3.3 V). All eight channels share identical timing and drive characteristics, with no internal bus contention protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 1.65 V to 3.6 V - Enables interoperability between 1.8-V, 2.5-V, and 3.3-V logic subsystems without level shifters. |
| Max tpd | 3.4 ns at 3.3 V - Supports >100-MHz bus toggle rates in synchronous systems with tight timing budgets. |
| Output Drive | ±24 mA at 3.3 V - Drives 50-Ω transmission lines or loads up to 10 LVTTL inputs with margin. |
| IOZ (Off-State Leakage) | ±10 µA at 3.6 V - Ensures <1 µW standby power per channel when disabled, critical for low-power sleep modes. |
| Operating Temp | –40°C to +85°C - Qualified for industrial temperature range, suitable for factory automation and outdoor edge nodes. |
| Input Capacitance | 4.5 pF (control pins), 11.5 pF (I/O ports) - Minimizes signal loading on upstream drivers and reduces crosstalk in dense PCB layouts. |
| Latch-Up Immunity | >250 mA per JESD 17 - Withstands transient overcurrent events during hot insertion or ESD discharge without destructive failure. |
Pinout & Package
SN74ALVC245DW uses a 20-pin SOIC (DW) package, 7.5 mm × 12.8 mm body, 2.65 mm max height, 1.27 mm pitch, JEDEC MS-013 compliant. Pin 1 index located at top-left corner with beveled edge marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (DIR) | Direction Control Input | High = A→B data flow; Low = B→A; determines signal path polarity for all eight channels simultaneously. |
| 2–9 (A1–A8) | Port A I/O Terminals | Bidirectional data terminals connected to first bus segment; internally isolated when OE = high. |
| 10 (GND) | Ground Reference | Primary return path for all I/O and supply currents; must be low-inductance connection to minimize ground bounce. |
| 11 (VCC) | Power Supply | Single 1.65–3.6-V supply powering both input and output stages; requires local 100-nF ceramic decoupling. |
| 12 (OE) | Output Enable Input | Active-low; drives all outputs to high-impedance when high; tie to VCC via pull-up for power-up safety. |
| 13–20 (B1–B8) | Port B I/O Terminals | Second bidirectional bus port; electrically identical to A-side but physically separated for routing flexibility. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional Bus Control | Single DIR pin configures full 8-bit data path direction-eliminates need for separate transmit/receive buffers. |
| 3-State Output Isolation | OE input forces all A/B pins into high-Z with <±10 µA leakage-enables multi-drop bus arbitration and safe hot-swap. |
| Voltage-Level Flexibility | 1.65–3.6-V operation with scalable VIH/VIL thresholds-supports direct interface between 1.8-V microcontrollers and 3.3-V peripherals. |
| High-Speed Timing | 3.4-ns max tpd at 3.3 V with 1.3-ns ten/tdis-meets setup/hold requirements for 100+ MHz parallel interfaces. |
| Robust ESD/Latch-Up | JESD 17–qualified >250 mA latch-up immunity and >2-kV HBM ESD rating-reduces field failure risk in industrial environments. |
Applications
| Industrial Backplane Interconnect | Embedded Microcontroller Bus Expansion |
|---|---|
|
Use Scenario: Isolating CPU local bus from extended I/O modules in programmable logic controllers (PLCs). IC Role / Device Role / Timing Role: Bidirectional data bridge between ARM Cortex-M4 core running at 3.3 V and legacy 1.8-V sensor interface cards. Use Value: Eliminates discrete level shifters while maintaining sub-4-ns propagation delay for deterministic real-time response. |
Use Scenario: Expanding GPIO count of a RISC-V SoC via parallel peripheral interface to external ADC/DAC arrays. IC Role / Device Role / Timing Role: Octal transceiver enabling time-multiplexed access to two 8-bit analog front-ends using shared data lines. Use Value: Provides 24-mA drive to overcome trace capacitance across 10-cm PCB runs, ensuring clean signal integrity at 50-MHz toggle rate. |
| Hot-Swappable Module Interface | Low-Power Sensor Hub Aggregation |
|
Use Scenario: Enabling safe insertion/removal of fieldbus communication cards in modular gateway hardware. IC Role / Device Role / Timing Role: Bus isolator that places A/B ports in high-Z during card insertion, preventing bus contention. Use Value: OE-controlled shutdown limits leakage to <10 µA per channel, avoiding wake-up current spikes during hot-plug events. |
Use Scenario: Aggregating outputs from eight ultra-low-power environmental sensors (temp/humidity/pressure) onto a single MCU data bus. IC Role / Device Role / Timing Role: Level-translating buffer matching 1.8-V sensor logic to 3.3-V host MCU, with minimal standby power draw. Use Value: 1.65-V minimum VCC allows operation directly from buck converter output, reducing BOM count and quiescent current. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC245A-DW | Lower drive (±24 mA only at ≥2.7 V); higher VIH threshold (2.0 V min at 3.3 V); identical pinout and SOIC-20 package. | Less suitable for marginal 1.8-V-to-3.3-V translation where input noise margin is critical; better for pure 3.3-V systems. | Select SN74LVC245A-DW if operating exclusively above 2.7 V and cost optimization is prioritized over wide-VCC flexibility. |
| 74AVC245TTR | Same 1.2–3.6-V range and ±24-mA drive, but TSSOP-20 (PW) package; slightly faster tpd (3.0 ns typ at 3.3 V); different pinout (DIR/OE swapped). | Requires PCB layout revision due to pinout mismatch and smaller footprint; preferred for space-constrained portable designs. | Choose 74AVC245TTR only when board redesign is acceptable and 0.65-mm pitch TSSOP assembly capability exists. |
Compared with SN74ALVC245DW, SN74LVC245A-DW trades voltage-range versatility for lower cost in fixed 3.3-V systems, while 74AVC245TTR offers speed and density gains at the expense of mechanical and pinout compatibility.
Availability
SN74ALVC245DW is available at Aetrix Electronics and suitable for industrial backplane interconnect, embedded microcontroller bus expansion, hot-swappable module interface, and low-power sensor hub aggregation requiring stable component supply and long-term production continuity.
Supply support for SN74ALVC245DW 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 over 50 years of innovation in industrial and automotive electronics.
The SN74ALVC245DW belongs to TI's ALVC (Advanced Low-Voltage CMOS) logic family, engineered for high-speed, low-voltage bidirectional bus interfacing in mixed-signal industrial systems.
FAQ
What is the recommended power-up sequence for SN74ALVC245DW?
TI recommends tying OE to VCC through a pull-up resistor (value determined by driver sink capability) to ensure outputs remain in high-impedance state during power ramp-up. VCC should stabilize before applying valid logic signals to DIR or data pins. This prevents bus contention and ensures deterministic initialization of the SN74ALVC245DW.
Can SN74ALVC245DW interface between 1.8-V and 3.3-V buses without external level shifters?
Yes. The SN74ALVC245DW supports 1.65–3.6-V operation with VCC-independent input thresholds (VIH = 0.65×VCC min), allowing direct connection of 1.8-V outputs to its A-side and 3.3-V loads to its B-side when powered at 3.3 V. This eliminates external level shifters in mixed-voltage SN74ALVC245DW applications.
What is the maximum data rate supported by SN74ALVC245DW in a typical PCB layout?
With a 3.4-ns max propagation delay and 1.3-ns enable/disable times, the SN74ALVC245DW supports reliable 100-MHz bus toggle rates under controlled-impedance conditions. Real-world performance depends on trace length, termination, and capacitive loading-TI's reference layout guidelines for SOIC-20 recommend ≤10 cm traces and 30-pF load for full-spec timing compliance with SN74ALVC245DW.
Does SN74ALVC245DW require external pull-up or pull-down resistors on DIR or OE?
OE must be pulled up to VCC (via resistor) to guarantee high-impedance state at power-up; DIR may float only if system logic guarantees known state before enabling-TI advises actively driving DIR to avoid metastability. Neither pin requires pull-down; unused inputs should be tied to VCC or GND per SCBA004 guidance for SN74ALVC245DW reliability.
How does SN74ALVC245DW handle bus contention when DIR and OE states change asynchronously?
The SN74ALVC245DW has no internal bus contention protection. If DIR changes while OE is active, one side may briefly drive against the other. Designers must coordinate DIR transitions with OE assertion in firmware or use external arbitration logic. TI specifies no guaranteed contention-free window-robust system design requires synchronized control of both SN74ALVC245DW inputs.
SN74ALVC245DW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ALVC
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Bulk
- 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:
- 24mA, 24mA
- Voltage - Supply:
- 1.65V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
SN74ALVC245DW FAQ
1.How can I place an order for SN74ALVC245DW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ALVC245DW 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 SN74ALVC245DW reliable?
The price and inventory of SN74ALVC245DW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ALVC245DW is usually 5 days.
3.What payment methods are accepted for SN74ALVC245DW?
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4.How is shipping managed for SN74ALVC245DW?
SN74ALVC245DW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ALVC245DW 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 SN74ALVC245DW?
For technical support, including SN74ALVC245DW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ALVC245DW requirements.
6.How does Aetrix verify that SN74ALVC245DW is sourced from the original manufacturer or authorized distributors?
All SN74ALVC245DW 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 SN74ALVC245DW meets industry standards.
7.What is the process for return or replacement of SN74ALVC245DW?
All SN74ALVC245DW units undergo pre-shipment inspection (PSI). If there is an issue with SN74ALVC245DW, 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 SN74ALVC245DW part is unused and in its original packaging.
Return procedure for SN74ALVC245DW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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