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Texas Instruments SN74LVCH245ADB
- Part No.:
- SN74LVCH245ADB
- Manufacturer:
- Texas Instruments
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
SN74LVCH245ADB.pdf
- Description:
- IC TXRX NON-INVERT 3.6V 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:8,190
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Product details
Overview
SN74LVCH245ADB from Texas Instruments is an octal bus transceiver with 3-state outputs, designed for bidirectional data flow between A and B buses in mixed-voltage systems. It operates from 1.65 V to 3.6 V, accepts 5.5 V-tolerant inputs, features bus-hold circuitry, and delivers max propagation delay of 6.3 ns at 3.3 V - enabling use in industrial control backplanes and FPGA I/O bridging.
For engineers reviewing the SN74LVCH245ADB datasheet, SN74LVCH245ADB pinout, SN74LVCH245ADB application, or SN74LVCH245ADB equivalent, key selection criteria include its 20-pin SSOP (DB) package, Ioff partial-power-down support, 3.3-V/5-V mixed-mode signal compatibility, and guaranteed 8 mA output drive at 3 V.
Technical Context
This device implements dual-directional asynchronous bus translation via a single DIR control input and independent OE enable logic. Its bus-hold circuitry actively maintains valid logic levels on unused A/B port inputs without external resistors, and Ioff protection disables outputs during power-down to prevent current backflow.
The transceiver supports true 3-state isolation when OE is high, and propagates data either A→B (DIR = high) or B→A (DIR = low). All inputs tolerate up to 5.5 V regardless of VCC, allowing direct interfacing between 3.3-V logic and legacy 5-V peripherals.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 1.65 V to 3.6 V - enables operation across low-power microcontrollers and standard 3.3-V systems |
| Max tpd | 6.3 ns at VCC = 3.3 V - ensures timing compliance in high-speed digital backplane designs |
| Ioff Support | Yes - prevents damaging current flow during partial power-down in hot-swap or modular systems |
| Input Voltage Tolerance | Up to 5.5 V - allows direct connection to 5-V TTL or CMOS without level-shifting circuitry |
| Bus-Hold | Integrated on all A/B data inputs - eliminates need for external pullup/pulldown resistors |
| Output Drive | ±24 mA at VCC = 3 V - sufficient to drive multiple CMOS loads or moderate trace capacitance |
| ESD Protection | 2000-V HBM, 200-V MM - meets industrial-grade robustness requirements per JESD22 |
Pinout & Package
SN74LVCH245ADB uses a 20-pin SSOP (Shrink Small-Outline Package) with 0.65 mm pitch, JEDEC MO-150 compliant, body dimensions 7.5 mm × 5.3 mm × 1.95 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | DIR | Direction control: high = A→B, low = B→A; active-high logic |
| 2–9 | A1–A8 | Port A data inputs/outputs - bidirectional I/O pins connected to source bus |
| 10 | GND | Ground reference for all internal circuitry and I/O |
| 11 | VCC | Power supply input (1.65–3.6 V); decoupling capacitor required near pin |
| 12–19 | B1–B8 | Port B data inputs/outputs - bidirectional I/O pins connected to destination bus |
| 20 | OE | Output enable: low = enabled, high = 3-state isolation; active-low logic |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-mode voltage translation | Supports 5-V inputs with 3.3-V VCC - enables seamless interface between legacy and modern logic families |
| Bus-hold circuitry | Eliminates external biasing components on floating A/B inputs - reduces BOM count and layout complexity |
| Ioff partial-power-down | Prevents back-current when VCC = 0 V - critical for hot-plug and power-gated subsystems |
| Low ground bounce | VOLP < 0.8 V at VCC = 3.3 V - minimizes noise coupling into shared ground planes |
| Fast enable/disable | ten = 8.5 ns, tdis = 7.5 ns at VCC = 3.3 V - supports rapid bus arbitration in real-time systems |
Applications
| Industrial PLC Backplane | FPGA I/O Expansion |
|---|---|
Use Scenario: Interfacing multiple 5-V sensor modules to a 3.3-V FPGA-based controller in a programmable logic controller rack. IC Role / Device Role / Timing Role: Bidirectional level-translating bus transceiver managing data flow between sensor-side and processor-side buses under DIR and OE control. Use Value: Eliminates discrete level shifters; bus-hold prevents floating inputs during module insertion/removal; Ioff protects FPGA I/O during hot-swap events. | Use Scenario: Extending FPGA GPIO count by connecting additional peripheral ICs (e.g., ADCs, DACs) operating at different voltage domains. IC Role / Device Role / Timing Role: Octal transceiver providing isolated, direction-controlled data path between FPGA bank and external 5-V analog front-end. Use Value: 6.3 ns tpd meets FPGA setup/hold timing budgets; 5.5-V input tolerance avoids dedicated level-shifter ICs; SSOP package fits dense PCB layouts. |
| Embedded Communication Bridge | Test Equipment Signal Routing |
Use Scenario: Isolating and translating control signals between a 3.3-V ARM microcontroller and 5-V legacy instrumentation hardware in automated test systems. IC Role / Device Role / Timing Role: Directionally configurable bus buffer enabling synchronous command/data exchange while maintaining electrical domain separation. Use Value: OE-driven 3-state isolation prevents bus contention during firmware updates; 24 mA drive strength ensures reliable signaling over 15 cm PCB traces. | Use Scenario: Dynamically reconfiguring signal paths in modular benchtop test equipment where DUT interfaces vary between 3.3-V and 5-V logic standards. IC Role / Device Role / Timing Role: Reversible data conduit controlled by FPGA-configured DIR/OE lines to route stimulus/response signals across voltage domains. Use Value: Single-chip solution replaces dual unidirectional buffers; bus-hold maintains stable states during path reconfiguration delays; RoHS-compliant SSOP eases regulatory compliance. |
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 | No bus-hold; lower Ioff rating; identical pinout and VCC range | Lacks bus-hold - requires external pullups on unused inputs | Select when cost sensitivity outweighs need for floating-input immunity |
| SN74AVC245 | Wider VCC range (1.2–3.6 V); higher speed (tpd = 3.2 ns); no bus-hold | Supports 1.2-V core logic but lacks bus-hold and Ioff robustness | Choose for ultra-low-voltage systems where bus-hold is managed externally |
Compared with SN74LVC245A and SN74AVC245, SN74LVCH245ADB provides unique bus-hold and enhanced Ioff protection - making it preferred for industrial environments with intermittent connections or unpowered modules.
Availability
SN74LVCH245ADB is available at Aetrix Electronics and suitable for industrial automation, FPGA I/O expansion, and embedded communication bridge applications requiring stable component supply and long-term manufacturability.
Supply support for SN74LVCH245ADB 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 delivering analog and embedded processing solutions for industrial, automotive, and communications markets.
The SN74LVCH245ADB belongs to TI's LVC/LVCH logic family, engineered for low-voltage, mixed-signal interfacing with emphasis on robustness, voltage translation, and power-aware design in space-constrained systems.
FAQ
What is the maximum operating temperature range for SN74LVCH245ADB?
The SN74LVCH245ADB is rated for operation from –40°C to +85°C ambient temperature. This industrial temperature range is confirmed in TI's official ordering information and thermal data tables, and applies specifically to the DB-package variant. The device's thermal impedance (θJA = 70°C/W) supports reliable performance within this range when mounted on standard FR-4 PCBs with adequate copper pour.
Does SN74LVCH245ADB support hot-swap operation?
Yes, SN74LVCH245ADB supports hot-swap operation via its Ioff feature, which disables outputs and blocks current backflow when VCC = 0 V. This behavior is explicitly specified in the datasheet's "Ioff" parameter table and functional description. When used with proper OE pull-up and board-level ESD protection, SN74LVCH245ADB safely isolates powered and unpowered sections of a backplane during live insertion or removal.
Can SN74LVCH245ADB be used to translate 5-V signals to a 1.8-V system?
No - SN74LVCH245ADB is not rated for 1.8-V VCC operation in translation mode. Its minimum VCC is 1.65 V, but input tolerance (to 5.5 V) only guarantees safe operation when VCC ≥ 2.3 V per the VIH/VIL specifications. At VCC = 1.8 V, the input thresholds become undefined and output drive falls below specification. For 5-V-to-1.8-V translation, TI recommends SN74AVC245 or dedicated level translators.
Is the bus-hold function on SN74LVCH245ADB disabled when OE is high?
No - the bus-hold circuitry on SN74LVCH245ADB remains fully active regardless of OE or DIR state. As stated in the datasheet: "The bus-hold circuitry is part of the input circuit and is not disabled by OE or DIR." This means unused A1–A8 or B1–B8 inputs retain valid logic levels even when the transceiver is in 3-state mode, eliminating risk of metastability or noise-induced switching during idle periods.
What is the recommended OE pull-up resistor value for SN74LVCH245ADB?
Texas Instruments specifies that OE should be tied to VCC through a pull-up resistor, with the minimum value determined by the current-sinking capability of the driving source. While no fixed value is mandated, a 10-kΩ resistor is commonly used for 3.3-V systems, ensuring OE remains reliably high during power-up. The datasheet cautions against using values smaller than required by the driver's sink current - typically >1 kΩ for most microcontroller GPIOs - to avoid excessive static current draw.
SN74LVCH245ADB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVCH
- Package/Case:
- 20-SSOP (0.209", 5.30mm 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 ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SSOP
SN74LVCH245ADB FAQ
1.How can I place an order for SN74LVCH245ADB through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVCH245ADB on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
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The price and inventory of SN74LVCH245ADB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVCH245ADB is usually 5 days.
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5.How can I obtain technical support or documentation for SN74LVCH245ADB?
For technical support, including SN74LVCH245ADB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVCH245ADB requirements.
6.How does Aetrix verify that SN74LVCH245ADB is sourced from the original manufacturer or authorized distributors?
All SN74LVCH245ADB 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 SN74LVCH245ADB meets industry standards.
7.What is the process for return or replacement of SN74LVCH245ADB?
All SN74LVCH245ADB units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVCH245ADB, 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 SN74LVCH245ADB part is unused and in its original packaging.
Return procedure for SN74LVCH245ADB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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