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Texas Instruments SN74CBTLV3245DWR
- Part No.:
- SN74CBTLV3245DWR
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- -
- Datasheet:
-
SN74CBTLV3245DWR.pdf
- Description:
- BUS DRIVER
- Quantity:
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Inventory:6,000
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Product details
Overview
SN74CBTLV3245DWR from Texas Instruments is a low-voltage octal FET bus switch in standard '245 pinout, providing 8-bit bidirectional switching between port A and port B with 5 Ω typical on-state resistance, <0.25 ns propagation delay at 3.3 V, and operation from 2.3 V to 3.6 V supply. It enables high-speed data path isolation in memory and peripheral interconnects.
For engineers reviewing the SN74CBTLV3245DWR datasheet, SN74CBTLV3245DWR pinout, SN74CBTLV3245DWR application, or SN74CBTLV3245DWR equivalent, key selection criteria include guaranteed power-off isolation, ±30 µA off-state leakage at 0 V VCC, ESD robustness (>2000 V HBM), and compatibility with 3.3-V LVTTL logic families.
Technical Context
This device implements eight independent NMOS transmission-gate switches controlled by a single active-low output enable (OE) input. Each switch exhibits symmetrical conduction-no directionality-enabling true bidirectional signal flow between A and B ports when enabled.
It operates without internal level shifting; all I/O pins are 3.3-V tolerant with rail-to-rail voltage handling (–0.5 V to 4.6 V). The OE input requires defined logic levels per VCC range (e.g., VIH ≥ 2.0 V at VCC = 3.6 V), and must be pulled up to VCC during power sequencing to ensure high-impedance state at startup.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.3 V to 3.6 V - Supports core logic rails of modern 3.3-V systems without level translators. |
| ron (Typ/Max) | 5 Ω / 7 Ω - Enables <100 ps RC delay into 30-pF loads, preserving signal integrity in high-speed buses. |
| tpd (Max) | 0.25 ns - Measured as RC time constant of ron and 30-pF load; ensures sub-nanosecond latency in critical paths. |
| Ioff (Max) | 30 µA at VCC = 0 V - Guarantees effective signal isolation when system power is removed. |
| ESD Rating | >2000 V HBM (MIL-STD-883) - Protects against handling damage in automated assembly and field service. |
| Operating Temp | –40°C to +85°C - Validated for industrial temperature environments without derating. |
| Input Capacitance | 3.5 pF - Minimizes capacitive loading on driving logic, reducing fanout constraints. |
Pinout & Package
SN74CBTLV3245DWR is supplied in a 20-pin Small-Outline (DW) package with standard '245 pinout and no internal connection on pin 1 (NC).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (NC) | No internal connection | Must remain unconnected; no routing or termination required. |
| 2–9 (A1–A8) | Port A data inputs/outputs | Bidirectional I/O terminals connected through FET switches to corresponding B pins when OE is low. |
| 10 (GND) | Ground reference | Primary return path for switch current and logic control; must be low-impedance. |
| 11 (VCC) | Power supply | Supplies bias for internal FET gates and logic; bypassing with 0.1 µF ceramic near pin is recommended. |
| 12 (OE) | Active-low output enable | Drives all eight switches simultaneously; must be pulled up to VCC during power-up to prevent glitching. |
| 13–20 (B1–B8) | Port B data inputs/outputs | Bidirectional I/O terminals; electrically identical to A-side with symmetrical ron and capacitance. |
Key Features
| Feature | Design Value |
|---|---|
| Standard '245 pinout | Enables drop-in replacement of legacy 74-series transceivers in existing PCB layouts without redesign. |
| 5-Ω on-state resistance | Reduces voltage drop and timing skew across all eight channels, supporting >100 MHz bus operation. |
| Power-off isolation | Maintains high-impedance between A and B ports even when VCC = 0 V, preventing back-drive conflicts. |
| Low dynamic power | ICC ≤ 20 µA at 3.6 V - Eliminates static power penalty in always-on isolation applications. |
| 3.3-V logic compatibility | VIH/VIL thresholds scale with VCC, ensuring reliable interfacing with LVTTL, LVCMOS, and ALVC families. |
Applications
| Memory Interleaving | PCI Bus Isolation |
|---|---|
|
Use Scenario: Routing address/data lines between two DRAM banks controlled by separate memory controllers. IC Role / Device Role / Timing Role: Bidirectional bus switch enabling time-multiplexed access while blocking crosstalk during inactive cycles. Use Value: 5-Ω ron and <0.25 ns tpd preserve setup/hold timing margins; power-off isolation prevents contention when one bank is powered down. |
Use Scenario: Isolating PCI add-in card signals from motherboard logic during hot-plug insertion or firmware reset. IC Role / Device Role / Timing Role: Signal-path gate controlled by system management logic to decouple card I/O from host bus. Use Value: Guaranteed high-Z state at VCC = 0 V eliminates back-driving risk; 2000-V HBM ESD withstand protects during handling. |
| Processor Debug Interface | LCD Controller Expansion |
|
Use Scenario: Sharing JTAG or trace pins between main CPU and debug probe without signal contention. IC Role / Device Role / Timing Role: Controlled bidirectional switch enabling probe attachment while maintaining processor functionality. Use Value: Symmetrical A/B ports support full-duplex trace streaming; low capacitance (3.5 pF) avoids signal degradation at 50+ MHz. |
Use Scenario: Adding external display memory or timing controller to an SoC with limited GPIO bandwidth. IC Role / Device Role / Timing Role: Parallel data path extender that isolates auxiliary display logic from primary system bus. Use Value: Standard '245 pinout simplifies layout reuse; 3.3-V operation matches typical LCD driver IC voltage domains. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus-switching applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBT3245DBR | Higher VCC max (5.5 V), higher ron (7 Ω typ), no 2.3-V min guarantee | Supports mixed 3.3-V/5-V systems but lacks low-voltage optimization below 2.7 V | Choose when 5-V tolerance is required and 2.3–2.7 V operation is not needed. |
| SN74LVC245APW | Octal bus transceiver with 3-state outputs, not a passive switch; requires direction control (DIR) | Provides level-shifting capability but adds propagation delay (~5 ns) and direction logic overhead | Choose only if bidirectional level translation (e.g., 1.8 V ↔ 3.3 V) is required instead of pure isolation. |
Compared with SN74CBTLV3245DWR, SN74CBT3245DBR offers wider supply range at the cost of higher on-resistance and reduced low-voltage performance, while SN74LVC245APW introduces direction control complexity and significantly higher latency-neither is pin-compatible, and both require PCB layout changes.
Availability
SN74CBTLV3245DWR is available at Aetrix Electronics and suitable for memory interleaving, PCI bus isolation, processor debug interface, and LCD controller expansion requiring stable component supply and industrial-temperature operation.
Supply support for SN74CBTLV3245DWR 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 communications markets.
The SN74CBTLV3245 belongs to TI's low-voltage bus-switch family, designed specifically for high-speed, low-latency signal isolation in 3.3-V digital systems without introducing direction control or level-shifting overhead.
FAQ
What is the maximum operating voltage for SN74CBTLV3245DWR?
The SN74CBTLV3245DWR supports a supply voltage range of 2.3 V to 3.6 V. Absolute maximum rating is 4.6 V, but operation above 3.6 V violates recommended conditions and may impair reliability or timing performance. All electrical specifications-including ron, tpd, and VIH/VIL-are validated only within the 2.3–3.6 V range.
Does SN74CBTLV3245DWR support bidirectional signal flow?
Yes, SN74CBTLV3245DWR provides fully bidirectional signal conduction between port A and port B when OE is low. There is no inherent directionality-the FET switches conduct equally in either direction, making it suitable for data, address, and control lines that change flow dynamically.
How does SN74CBTLV3245DWR behave when VCC = 0 V?
When VCC = 0 V, SN74CBTLV3245DWR maintains high-impedance isolation between port A and port B, with off-state leakage limited to 30 µA maximum. This power-off isolation prevents back-driving of live circuits and is critical for hot-swap and partial-power-down architectures.
What is the recommended pull-up resistor value for OE on SN74CBTLV3245DWR?
The minimum OE pull-up resistor value for SN74CBTLV3245DWR depends on the driver's sink current capability. TI specifies that OE must be pulled to VCC to ensure high-Z during power-up; a typical value is 10 kΩ, but the exact value is determined by the current-sinking strength of the controlling logic-e.g., 100 µA sink capability allows up to 33 kΩ at 3.3 V.
Is SN74CBTLV3245DWR pin-compatible with standard 74LS245 or 74HC245 devices?
SN74CBTLV3245DWR uses the standard '245 pinout (A1–A8, GND, VCC, OE, B1–B8), matching mechanical and signal pin locations of 74LS245 and 74HC245. However, it is not functionally interchangeable-those are 3-state transceivers requiring DIR control, whereas SN74CBTLV3245DWR is a passive bidirectional switch with no direction pin.
SN74CBTLV3245DWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Type:
- -
- Circuit:
- -
- Independent Circuits:
- -
- Current - Output High, Low:
- -
- Voltage Supply Source:
- -
- Voltage - Supply:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
SN74CBTLV3245DWR FAQ
1.How can I place an order for SN74CBTLV3245DWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CBTLV3245DWR 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 SN74CBTLV3245DWR reliable?
The price and inventory of SN74CBTLV3245DWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBTLV3245DWR is usually 5 days.
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Once your SN74CBTLV3245DWR 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 SN74CBTLV3245DWR?
For technical support, including SN74CBTLV3245DWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBTLV3245DWR requirements.
6.How does Aetrix verify that SN74CBTLV3245DWR is sourced from the original manufacturer or authorized distributors?
All SN74CBTLV3245DWR 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 SN74CBTLV3245DWR meets industry standards.
7.What is the process for return or replacement of SN74CBTLV3245DWR?
All SN74CBTLV3245DWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBTLV3245DWR, 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 SN74CBTLV3245DWR part is unused and in its original packaging.
Return procedure for SN74CBTLV3245DWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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