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Texas Instruments SN74ALVC245PWR
- Part No.:
- SN74ALVC245PWR
- Manufacturer:
- Texas Instruments
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74ALVC245PWR.pdf
- Description:
- IC TXRX NON-INVERT 3.6V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:7,267
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Product details
Overview
SN74ALVC245PWR 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. It enables A↔B bus communication in low-voltage embedded control and memory interface applications.
For engineers reviewing the SN74ALVC245PWR datasheet, SN74ALVC245PWR pinout, SN74ALVC245PWR application, or SN74ALVC245PWR equivalent, key selection criteria include voltage compatibility (1.65–3.6 V), 3-state isolation timing (ten/tdis ≤ 5.5 ns), direction-control logic behavior, thermal impedance (83°C/W), and TSSOP-20 package footprint constraints.
Technical Context
The SN74ALVC245PWR implements dual-rail CMOS logic with independent DIR and OE controls: DIR selects data flow direction (A→B or B→A), while OE enables/disables all outputs into high-impedance state. Its input thresholds scale with VCC (VIH = 0.65×VCC min at 1.65 V), ensuring robust noise margin across supply voltages.
It supports hot-insertion via I/O port ratings up to VCC + 0.5 V and latch-up immunity >250 mA per JESD 17. The device exhibits rail-to-rail output swing (VOH ≥ VCC − 0.2 V, VOL ≤ 0.55 V at 3 V) and low dynamic power (Cpd = 30 pF typical at 3.3 V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 1.65 V to 3.6 V - Enables interoperability across 1.8-V, 2.5-V, and 3.3-V logic domains without level shifters. |
| Max tpd | 3.4 ns at 3.3 V - Supports high-speed data handshaking in memory buffers and FPGA I/O expansion. |
| Output Drive | ±24 mA at 3.3 V - Sustains signal integrity driving 50-Ω transmission lines or multiple CMOS inputs. |
| IOZ (Off-State Leakage) | ±10 µA at 3.6 V - Ensures minimal bus leakage during 3-state isolation, critical for multi-drop bus hold-off. |
| Operating Temp | –40°C to +85°C - Qualified for industrial-grade embedded systems including motor control and PLC I/O modules. |
| Package | TSSOP-20 (PW) - 4.4-mm width, 0.65-mm pitch; compatible with standard SMT reflow and automated optical inspection. |
| Thermal Impedance | θJA = 83°C/W - Allows sustained operation at full drive strength without external heatsinking in compact PCB layouts. |
Pinout & Package
TSSOP-20 (PW) package: 4.4 mm × 6.5 mm body, 0.65 mm lead pitch, 1.2 mm max height, exposed pad not present. 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 bus orientation before OE activation. |
| 2–9 (A1–A8) | Port A Data Inputs/Outputs | Bidirectional I/O pins tied to source bus; high-impedance when OE = high. |
| 10 (GND) | Ground Reference | Primary return path for all internal logic and I/O current; must be low-inductance connection. |
| 11 (VCC) | Power Supply | Single 1.65–3.6-V supply for core and I/O; bypass capacitor required within 10 mm. |
| 12 (OE) | Output Enable Input | Active-low control: OE = low enables transceiver; OE = high forces all A/B pins to high-Z. |
| 13–20 (B1–B8) | Port B Data Inputs/Outputs | Bidirectional I/O pins tied to destination bus; isolated from A side when OE = high. |
Key Features
| Feature | Design Value |
|---|---|
| Wide VCC range | 1.65 V to 3.6 V - Eliminates need for separate voltage translators in mixed-supply systems. |
| High-output drive | ±24 mA at 3.3 V - Drives 50-Ω traces or fan-out of ≥10 LVTTL loads without buffering. |
| Fast switching | 3.4 ns max tpd - Meets timing budgets for 100+ MHz bus clocking in FPGA peripheral interfaces. |
| Latch-up immunity | >250 mA per JESD 17 - Withstands transient overcurrent events in noisy industrial environments. |
| Input threshold scaling | VIH/VIL track VCC - Maintains consistent noise margin across supply variations without external biasing. |
Applications
| Memory Interface Buffer | FPGA I/O Expansion |
|---|---|
Use Scenario: Isolating and translating data between a 3.3-V microcontroller and 1.8-V SRAM chip. IC Role / Device Role / Timing Role: Bidirectional level-shifting transceiver managing address/data bus handoff with precise OE-controlled isolation windows. Use Value: Enables direct connection without discrete level shifters; 3.4-ns tpd ensures setup/hold compliance at 50-MHz bus rates. | Use Scenario: Extending GPIO count on a Xilinx Artix-7 FPGA by connecting parallel peripheral devices. IC Role / Device Role / Timing Role: Octal bus repeater synchronizing signals between FPGA bank and external sensors/actuators. Use Value: Provides 8-bit parallel I/O with ±24-mA drive to overcome trace capacitance; OE allows dynamic bus partitioning. |
| Industrial PLC Backplane | Low-Power Sensor Hub |
Use Scenario: Interfacing multiple 2.5-V I/O modules to a central 3.3-V controller in modular automation hardware. IC Role / Device Role / Timing Role: Hot-swap-capable bus isolator preventing backfeeding during module insertion/removal. Use Value: VCC-tolerant I/O (up to VCC + 0.5 V) and >250-mA latch-up rating ensure system-level fault resilience. | Use Scenario: Aggregating data from eight 1.8-V environmental sensors to a 3.3-V MCU ADC interface. IC Role / Device Role / Timing Role: Power-aware bidirectional data concentrator enabling selective sensor polling via DIR/OE sequencing. Use Value: 1.65-V minimum VCC supports ultra-low-power sleep modes; 10-µA IOZ prevents battery drain during idle periods. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC245APWR | Lower drive (±24 mA only at 3.3 V; degrades to ±12 mA at 2.5 V); identical pinout and logic. | Suitable for 3.3-V-only systems; less margin for driving long traces or heavy capacitive loads at lower VCC. | Choose when operating strictly at 3.3 V and cost optimization is prioritized over wide-VCC flexibility. |
| 74AVC245TTR | Higher speed (2.2 ns tpd at 3.3 V); same VCC range and pinout; different manufacturer (STMicro). | Better suited for >100-MHz bus timing closure; requires validation of ST's thermal performance (θJA = 75°C/W). | Select when sub-3-ns propagation is mandatory and ST's qualification documentation meets your reliability requirements. |
Compared with SN74LVC245APWR and 74AVC245TTR, the SN74ALVC245PWR delivers superior voltage-range flexibility (1.65–3.6 V vs. 1.65–3.6 V but with tighter VIH/VIL specs) and proven industrial thermal robustness (83°C/W), making it optimal for mixed-supply embedded designs requiring guaranteed timing across voltage corners.
Availability
SN74ALVC245PWR is available at Aetrix Electronics and suitable for industrial PLC backplanes, FPGA I/O expansion, memory interface buffering, and low-power sensor hub designs requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SN74ALVC245PWR 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 experience in industrial and automotive-grade logic solutions.
The SN74ALVC245PWR belongs to TI's ALVC (Advanced Low-Voltage CMOS) logic family, engineered specifically for high-speed, low-voltage bidirectional bus interfacing in space-constrained industrial and communications equipment.
FAQ
What is the recommended power supply decoupling for SN74ALVC245PWR?
Place a 0.1-µF ceramic capacitor between VCC (pin 11) and GND (pin 10) within 5 mm of the SN74ALVC245PWR package. For systems with high-frequency switching noise, add a 4.7-µF bulk capacitor nearby. This ensures stable 1.65–3.6-V operation and suppresses supply-induced jitter on the SN74ALVC245PWR outputs.
Can SN74ALVC245PWR operate with VCC = 1.8 V while interfacing to 3.3-V peripherals?
No - the SN74ALVC245PWR is not a level translator. At VCC = 1.8 V, its VOH is only ~1.6 V (min), insufficient to meet 3.3-V VIH thresholds. To interface 1.8-V and 3.3-V buses, use dedicated level-shifting transceivers like TXB0108; the SN74ALVC245PWR requires matched VCC and bus voltage domains.
How should OE and DIR be handled during power-up to avoid bus contention with SN74ALVC245PWR?
Tie OE to VCC via a 10-kΩ pullup resistor and DIR to a known state (e.g., GND or VCC) through a 10-kΩ resistor. This ensures the SN74ALVC245PWR powers up in high-impedance mode (OE = high) and fixed direction, preventing glitches or short-circuits on A/B buses until firmware initializes control lines.
What is the maximum capacitive load the SN74ALVC245PWR can drive while maintaining 3.4-ns propagation delay?
The 3.4-ns tpd specification assumes CL = 50 pF (per TI SCES271D, VCC = 3.3 V). Driving >50 pF increases tpd nonlinearly - at 100 pF, tpd degrades to ~5.2 ns. For heavy loads, reduce trace length, add series termination, or select a higher-drive variant; the SN74ALVC245PWR itself does not compensate for excessive capacitance.
Is SN74ALVC245PWR RoHS compliant and halogen-free?
Yes - SN74ALVC245PWR is RoHS compliant (lead finish: NiPdAu) and halogen-free per TI's material declarations. The "G4" suffix in SN74ALVC245PWRG4 indicates green packaging; both SN74ALVC245PWR and SN74ALVC245PWRG4 meet JEDEC JS709D and IEC 61249-2-21 standards.
SN74ALVC245PWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ALVC
- Package/Case:
- 20-TSSOP (0.173", 4.40mm 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:
- 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-TSSOP
SN74ALVC245PWR FAQ
1.How can I place an order for SN74ALVC245PWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ALVC245PWR 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 SN74ALVC245PWR reliable?
The price and inventory of SN74ALVC245PWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ALVC245PWR is usually 5 days.
3.What payment methods are accepted for SN74ALVC245PWR?
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4.How is shipping managed for SN74ALVC245PWR?
SN74ALVC245PWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ALVC245PWR 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 SN74ALVC245PWR?
For technical support, including SN74ALVC245PWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ALVC245PWR requirements.
6.How does Aetrix verify that SN74ALVC245PWR is sourced from the original manufacturer or authorized distributors?
All SN74ALVC245PWR 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 SN74ALVC245PWR meets industry standards.
7.What is the process for return or replacement of SN74ALVC245PWR?
All SN74ALVC245PWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74ALVC245PWR, 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 SN74ALVC245PWR part is unused and in its original packaging.
Return procedure for SN74ALVC245PWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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