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Texas Instruments SN74LVCH245DW
- Part No.:
- SN74LVCH245DW
- Manufacturer:
- Texas Instruments
- Package:
- -
- Datasheet:
-
SN74LVCH245DW.pdf
- Description:
- BUS TRANSCEIVER
- Quantity:
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Inventory:4,375
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Product details
Overview
SN74LVCH245 from Texas Instruments is an octal bus transceiver with 3-state outputs, designed for 2.7-V to 3.6-V VCC operation and mixed-mode interfacing (5-V inputs/outputs with 3.3-V VCC). It supports bidirectional data flow between A and B buses under DIR control, features bus-hold on all data inputs, and operates across –40°C to 85°C. Used in level-shifting I/O expansion between 3.3-V logic and legacy 5-V subsystems.
For engineers reviewing the SN74LVCH245 datasheet, SN74LVCH245 pinout, SN74LVCH245 application, or SN74LVCH245 equivalent, key selection criteria include 3-state isolation timing (tdis ≤ 8.5 ns), bus-hold elimination of external pullups, ±24-mA drive at 3 V, and absolute input tolerance up to 5.5 V - critical for robust inter-voltage-domain communication.
Technical Context
The SN74LVCH245 implements asynchronous bidirectional data routing using a single DIR input to select A→B or B→A direction, and an active-low OE input to enable/disable all outputs simultaneously into high-impedance state. Its EPIC™ submicron CMOS process enables low ground bounce (VOLP < 0.8 V) and undershoot immunity (VOHV > 2 V) at 3.3 V.
Bus-hold circuitry actively maintains valid logic levels on floating A1–A8 and B1–B8 inputs without external components. Input voltage range spans –0.5 V to 6.5 V, supporting hot-swap and mixed-supply environments while maintaining latch-up immunity (>250 mA per JESD-17).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.7 V to 3.6 V - ensures compatibility with 3.3-V systems while tolerating supply variation during transient conditions. |
| IOH/IOL | ±24 mA at VCC = 3 V - drives standard TTL loads and sustains signal integrity across PCB traces up to 15 cm. |
| tpd | 1.5–7 ns (VCC = 3.3 V) - enables reliable operation in 100-MHz bus cycles with margin for setup/hold timing. |
| Input Voltage Range | –0.5 V to 5.5 V - allows direct connection to 5-V logic without level shifters, simplifying mixed-voltage board design. |
| Bus-Hold Current | ±75 µA at VI = 2 V - actively holds floating inputs at valid logic thresholds, eliminating need for 10-kΩ external pullups. |
| ESD Rating | >2000 V HBM, >200 V MM - meets industrial handling requirements without additional protection circuitry. |
| Operating Temp | –40°C to +85°C - qualified for extended temperature use in industrial control and automotive body electronics. |
Pinout & Package
SN74LVCH245DW uses a 20-pin plastic small-outline (DW) package with 0.300-inch body width and 1.27-mm pitch. Pin 1 is DIR, pin 10 is GND, pin 11 is VCC, pin 19 is OE, and pins 2–9 and 12–19 are bidirectional data terminals.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DIR (Pin 1) | Direction Control Input | Low = B→A data transfer; High = A→B transfer - determines real-time bus flow direction without clock or state machine. |
| OE (Pin 19) | Output Enable (Active-Low) | Low = outputs enabled; High = all A/B ports enter high-Z - provides system-level bus isolation during reset or power sequencing. |
| A1–A8 (Pins 2–9) | Port A Data I/O | Bidirectional interface for first data bus - internally terminated with bus-hold; accepts 0–5.5 V inputs regardless of VCC. |
| B1–B8 (Pins 12–19) | Port B Data I/O | Bidirectional interface for second data bus - electrically identical to A-side; enables symmetric inter-bus communication. |
| VCC (Pin 11) | Supply Voltage | 2.7–3.6 V only - powers internal logic and output drivers; must be decoupled locally with 0.1-µF ceramic capacitor. |
| GND (Pin 10) | Ground Reference | Return path for all I/O and supply currents - requires low-inductance connection to minimize switching noise coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-mode voltage interface | Accepts 5-V inputs and drives 5-V loads while powered from 3.3-V rail - eliminates discrete level shifters in 3.3/5-V hybrid systems. |
| Integrated bus-hold | Eliminates external pullup/pulldown resistors on all 16 data lines - reduces BOM count, PCB area, and layout complexity. |
| Low ground bounce | VOLP < 0.8 V at 3.3 V - prevents false logic transitions during simultaneous output switching, improving signal reliability. |
| High noise immunity | VOHV > 2 V undershoot margin - suppresses ringing-induced glitches on long traces or unterminated stubs. |
| Hot-swap capable inputs | VI rating up to 6.5 V with clamp current limit - permits safe insertion/removal in live backplane or modular systems. |
Applications
| Industrial PLC I/O Expansion | Embedded Microcontroller Bus Extension |
|---|---|
Use Scenario: Adding digital input/output capability to a 3.3-V ARM-based controller interfacing with legacy 24-V sensor/actuator modules via 5-V TTL-level signal conditioning. IC Role / Device Role / Timing Role: Level-translating bidirectional data buffer between MCU's GPIO port and external 5-V peripheral bus. Use Value: Enables direct connection without external level shifters or pullup networks, reducing component count by ≥12 parts per interface. |
Use Scenario: Expanding address/data bus width of an FPGA-based SoM to support additional memory-mapped peripherals operating at 5-V logic. IC Role / Device Role / Timing Role: Asynchronous bus transceiver providing direction-controlled data mirroring between FPGA and external 5-V ASIC. Use Value: Delivers sub-8-ns propagation delay and 24-mA drive strength to maintain timing closure across 10-cm trace runs. |
| Automotive Body Control Module | Test Equipment Signal Routing |
Use Scenario: Isolating and translating signals between a 3.3-V CAN microcontroller and 5-V dashboard display interface within ECU housing. IC Role / Device Role / Timing Role: Bidirectional voltage translator with bus-hold for unconnected display data lines during partial power-down modes. Use Value: Prevents floating inputs from causing spurious interrupts or display corruption during sleep/wake transitions. |
Use Scenario: Configurable signal path routing in automated test equipment where DUT I/O voltage domains vary between 3.3 V and 5 V. IC Role / Device Role / Timing Role: Reconfigurable bus isolator enabling software-selectable signal direction and channel enable/disable. Use Value: Supports dynamic reconfiguration via DIR/OE control lines, eliminating mechanical relay-based switching in multi-DUT testers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74LVC245A | No bus-hold; requires external pullups on unused inputs; lower drive (±24 mA at 3.3 V but only ±12 mA at 2.7 V). | Lacks integrated bus-hold - increases BOM and layout effort when floating inputs are present. | Choose when cost sensitivity outweighs design simplicity and floating-input risk is mitigated externally. |
| SN74LVTH245 | Higher drive (±64 mA), but no 5-V tolerant inputs; VI max = 3.6 V - requires external level translation for 5-V interfaces. | Not suitable for mixed-voltage domains without added components - limits use to pure 3.3-V systems. | Prefer when driving heavy capacitive loads (e.g., >50 pF per line) and all connected logic is 3.3-V only. |
Compared with 74LVC245A and SN74LVTH245, the SN74LVCH245 uniquely combines 5-V input tolerance, integrated bus-hold, and 24-mA drive in a single 20-pin SOIC package - making it optimal for minimizing component count and ensuring robustness in mixed-supply embedded interfaces.
Availability
SN74LVCH245 is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, embedded microcontroller bus extension, and automotive body control module designs requiring stable component supply, long-term lifecycle assurance, and consistent parametric performance.
Supply support for SN74LVCH245 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 company headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets.
The SN74LVCH245 belongs to TI's LVCH logic family, engineered specifically for robust mixed-voltage system interfacing with emphasis on bus stability, ESD resilience, and reduced external component dependency.
FAQ
What is the maximum input voltage the SN74LVCH245 can tolerate on its data pins?
The SN74LVCH245 supports an input voltage range of –0.5 V to 5.5 V on all A and B port pins, independent of VCC. This allows direct connection to 5-V logic sources without external level-shifting circuitry, and is verified per absolute maximum ratings in the SCES008 datasheet.
Does the SN74LVCH245 require external pullup resistors on its data inputs?
No - the SN74LVCH245 integrates active bus-hold circuitry on all A1–A8 and B1–B8 inputs, maintaining valid logic states on floating lines. This eliminates the need for external pullup or pulldown resistors, reducing BOM cost and PCB space versus alternatives like 74LVC245A.
What is the propagation delay of the SN74LVCH245 at 3.3-V supply?
The SN74LVCH245 exhibits a typical propagation delay (tpd) of 1.5 ns to 7 ns at VCC = 3.3 V ± 0.3 V, measured under CL = 50 pF load conditions. This ensures timing compliance in high-speed 3.3-V bus architectures with margins for trace delays and skew.
Can the SN74LVCH245 be used in hot-swap applications?
Yes - the SN74LVCH245 supports hot-swap operation due to its overvoltage-tolerant inputs (up to 6.5 V), robust ESD protection (>2000 V HBM), and controlled output enable/disable timing (tdis ≤ 8.5 ns). These features prevent damage or glitching when inserted into live backplanes or modular systems.
What package type does the SN74LVCH245DW variant use?
The SN74LVCH245DW uses a 20-pin plastic small-outline (DW) package with 300-mil body width and 1.27-mm lead pitch. It is RoHS-compliant, surface-mountable, and thermally rated for 1.6 W maximum power dissipation at TA = 55°C in still air.
SN74LVCH245DW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVCH
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Logic Type:
- -
- Number of Elements:
- -
- Number of Bits per Element:
- -
- Input Type:
- -
- Output Type:
- -
- Current - Output High, Low:
- -
- Voltage - Supply:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
SN74LVCH245DW FAQ
1.How can I place an order for SN74LVCH245DW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVCH245DW 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 SN74LVCH245DW reliable?
The price and inventory of SN74LVCH245DW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVCH245DW is usually 5 days.
3.What payment methods are accepted for SN74LVCH245DW?
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4.How is shipping managed for SN74LVCH245DW?
SN74LVCH245DW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVCH245DW 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 SN74LVCH245DW?
For technical support, including SN74LVCH245DW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVCH245DW requirements.
6.How does Aetrix verify that SN74LVCH245DW is sourced from the original manufacturer or authorized distributors?
All SN74LVCH245DW 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 SN74LVCH245DW meets industry standards.
7.What is the process for return or replacement of SN74LVCH245DW?
All SN74LVCH245DW units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVCH245DW, 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 SN74LVCH245DW part is unused and in its original packaging.
Return procedure for SN74LVCH245DW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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