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Diodes Incorporated 74LVC245AT20-13
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- Part No.:
- 74LVC245AT20-13
- Manufacturer:
- Diodes Incorporated
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
74LVC245AT20-13.pdf
- Description:
- IC TXRX NON-INVERT 3.6V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,475
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Product details
Overview
74LVC245AT20-13 from Diodes Incorporated is an octal bus transceiver with 3-state outputs, designed for bidirectional asynchronous data transfer between A and B buses in mixed-voltage systems. It operates from 1.65V to 3.6V, supports 5.5V-tolerant inputs, delivers ±24mA drive at VCC = 3.0V, and features IOFF partial power-down protection. Used in notebook I/O expansion and peripheral bus isolation.
For engineers reviewing the 74LVC245AT20-13 datasheet, 74LVC245AT20-13 pinout, 74LVC245AT20-13 application, or 74LVC245AT20-13 equivalent, key selection criteria include voltage translation capability (1.65V–3.6V core / 5.5V-tolerant inputs), 3-state bus isolation timing (tEN ≤ 8.5ns @ 3.3V), IOFF leakage (<±10μA), and TSSOP-20 thermal resistance (θJA = 74°C/W).
Technical Context
This device implements dual-directional 8-bit data flow controlled by DIR and OE pins: DIR = H enables A→B transmission; DIR = L enables B→A transmission; OE = H forces all outputs into high-impedance state. Schmitt-trigger inputs ensure noise immunity across voltage domains.
IOFF circuitry actively disables outputs during power-down, preventing back-current flow when VCC = 0V while inputs remain at 5.5V. Propagation delay (tPD) is 3.8ns typical at 3.3V, with output skew ≤1.5ns, supporting reliable timing in high-speed parallel bus interfaces.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.65V to 3.6V - Enables direct interface with 1.8V, 2.5V, and 3.3V logic domains without level shifters. |
| Input Voltage Tolerance | Up to 5.5V - Allows connection to legacy 5V peripherals while powered from lower VCC. |
| Output Drive Strength | ±24mA at VCC = 3.0V - Sufficient to drive 50Ω transmission lines or multiple CMOS loads on shared bus segments. |
| IOFF Leakage Current | ±10μA max at VCC = 0V - Prevents damaging backflow during hot-swap or partial power-down sequences. |
| Propagation Delay | 3.8ns typical (tPD) at 3.3V - Supports >100MHz bus toggle rates in synchronous control environments. |
| Enable/Disable Time | tEN = 4.4ns, tDIS = 4.1ns typical at 3.3V - Ensures fast bus arbitration and clean signal isolation during state transitions. |
| ESD Protection | 2kV HBM, 1kV CDM, 200V MM - Meets industrial-grade robustness requirements for board-level handling and operation. |
Pinout & Package
TSSOP-20 package: 6.4mm × 6.5mm × 1.2mm body, 0.65mm lead pitch, exposed pad not present. RoHS-compliant, halogen-free, green construction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | DIR | Direction control input: HIGH routes A→B; LOW routes B→A. |
| 2–9 | 1A1–1A4, 2Y1–2Y4 | A-side inputs / B-side outputs - Grouped for compact PCB routing of 4-bit lanes. |
| 10 | GND | Ground reference for all I/O and internal logic - must be low-inductance connection. |
| 11–18 | 2A1–2A4, 1Y1–1Y4 | B-side inputs / A-side outputs - Complementary set enabling full bidirectional 8-bit path. |
| 19 | OE | Active-low output enable: LOW enables transceiver; HIGH places all outputs in high-Z state. |
| 20 | VCC | Core supply input - decoupling capacitor (100nF) required within 5mm of pin. |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-voltage interoperability | 5.5V-tolerant inputs allow direct connection to 5V peripherals while operating at 1.8V/2.5V/3.3V VCC. |
| IOFF partial power-down | Outputs automatically disable with near-zero leakage (<±10μA) when VCC = 0V, protecting downstream circuits. |
| Schmitt-trigger inputs | Hysteresis ≥0.3V ensures reliable switching in noisy environments (e.g., shared PCB ground planes). |
| Low dynamic ground bounce | VOLP < 0.8V at VCC = 3.3V - minimizes noise coupling into adjacent signal traces during simultaneous switching. |
| High-speed bus timing | tPD = 3.8ns and tDIS = 4.1ns typical at 3.3V - supports sub-10ns setup/hold margins in 100+ MHz parallel interfaces. |
Applications
| PC Notebook I/O Expansion | Hard Disk Interface Isolation |
|---|---|
|
Use Scenario: Extending LPC or eSPI bus signals between chipset and Super I/O controller in space-constrained notebooks. IC Role / Device Role / Timing Role: Bidirectional level-translating buffer managing 8-bit address/data multiplexing with precise enable/disable timing. Use Value: Eliminates need for discrete level shifters while maintaining <4.5ns propagation delay and <1.5ns output skew for timing-critical reset and configuration cycles. |
Use Scenario: Isolating SATA host controller GPIOs from disk drive status lines during hot-plug events. IC Role / Device Role / Timing Role: 3-state bus isolator activated by hot-swap controller to prevent bus contention during insertion/removal. Use Value: IOFF protection prevents current backflow into powered-down host controller, meeting SATA hot-plug reliability requirements. |
| Set-Top Box Peripheral Bus | Industrial PLC I/O Module |
|
Use Scenario: Interfacing 3.3V SoC with legacy 5V IR receiver and HDMI CEC controllers in consumer AV equipment. IC Role / Device Role / Timing Role: Voltage-tolerant transceiver enabling bidirectional command/response exchange over shared control bus. Use Value: 5.5V input tolerance allows direct connection to 5V IR demodulator outputs without external resistors or clamps. |
Use Scenario: Buffering isolated CAN/FlexRay transceiver control lines to microcontroller in modular I/O chassis. IC Role / Device Role / Timing Role: Signal direction manager synchronizing diagnostic access to fieldbus peripherals during firmware updates. Use Value: Schmitt-trigger inputs reject EMI-induced glitches on long PCB traces in electrically noisy factory environments. |
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 (TI) | Identical logic function and pinout; slightly higher ICC (max 40μA vs 30μA) and lower tPD min (1ns vs 1.5ns). | Same TSSOP-20 footprint; optimized for TI-centric designs with tighter timing budgets. | Select when sourcing from TI-authorized channels or requiring TI-specific qualification documentation. |
| 74LVC245ABQ20-13 (Diodes Inc.) | Same die, QFN-20 package (2.5mm × 4.5mm); θJA = 67°C/W vs 74°C/W; no exposed pad. | Preferred for space-constrained industrial modules where thermal performance and board area are critical. | Choose for high-density layouts needing 40% smaller footprint and improved thermal dissipation over TSSOP. |
Compared with SN74LVC245APWR and 74LVC245ABQ20-13, the 74LVC245AT20-13 offers optimal balance of proven TSSOP manufacturability, industry-standard thermal profile, and seamless compatibility with existing Diodes-incorporated BOMs - especially where reflow process stability and test accessibility are prioritized.
Availability
74LVC245AT20-13 is available at Aetrix Electronics and suitable for PC notebook I/O expansion, hard disk interface isolation, and set-top box peripheral bus applications requiring stable component supply across multi-year production cycles.
Supply support for 74LVC245AT20-13 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
Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, with design centers across Asia and manufacturing in China, Malaysia, and Taiwan.
The 74LVC245A belongs to Diodes' LVC logic family, engineered for low-voltage, mixed-signal interfacing in portable and embedded systems where power efficiency, voltage translation, and robustness under partial power-down conditions are essential.
FAQ
What is the maximum input voltage the 74LVC245AT20-13 can tolerate while powered at 1.65V?
The device accepts input voltages up to 5.5V regardless of VCC level, including at minimum 1.65V supply. This is verified per datasheet Section "Recommended Operating Conditions" (VI = 0 to 5.5V) and enables safe interfacing with 5V peripherals even when core logic runs at 1.8V.
Does the 74LVC245AT20-13 support hot-swap operation?
Yes - its IOFF feature actively disables outputs and limits leakage to ±10μA when VCC = 0V, preventing back-current flow during live insertion/removal. This behavior is characterized in the "Electrical Characteristics" table under IOFF parameter and confirmed in JESD78 latch-up testing (>250mA).
Can DIR and OE be tied together for simplified unidirectional control?
No - DIR controls data direction (A↔B), while OE independently enables/disables all outputs. Tying them eliminates bidirectional capability and risks undefined states during transitions. The function table explicitly requires independent control for correct operation.
What is the recommended PCB layout practice for minimizing ground bounce?
Place a 100nF ceramic decoupling capacitor between VCC and GND within 5mm of pins 20 and 10, use solid ground plane beneath the TSSOP-20 footprint, and route DIR/OE traces away from sensitive analog sections - all validated by measured VOLP < 0.8V at 3.3V per datasheet Figure 1 test conditions.
74LVC245AT20-13 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- 74LVC
- 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 ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
74LVC245AT20-13 FAQ
1.How can I place an order for 74LVC245AT20-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74LVC245AT20-13 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 74LVC245AT20-13 reliable?
The price and inventory of 74LVC245AT20-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74LVC245AT20-13 is usually 5 days.
3.What payment methods are accepted for 74LVC245AT20-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74LVC245AT20-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74LVC245AT20-13?
74LVC245AT20-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74LVC245AT20-13 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 74LVC245AT20-13?
For technical support, including 74LVC245AT20-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74LVC245AT20-13 requirements.
6.How does Aetrix verify that 74LVC245AT20-13 is sourced from the original manufacturer or authorized distributors?
All 74LVC245AT20-13 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 74LVC245AT20-13 meets industry standards.
7.What is the process for return or replacement of 74LVC245AT20-13?
All 74LVC245AT20-13 units undergo pre-shipment inspection (PSI). If there is an issue with 74LVC245AT20-13, 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 74LVC245AT20-13 part is unused and in its original packaging.
Return procedure for 74LVC245AT20-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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