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Texas Instruments SN74CBT3245ADGVR
- Part No.:
- SN74CBT3245ADGVR
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 20-TFSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74CBT3245ADGVR.pdf
- Description:
- IC BUS SWITCH 8 X 1:1 20TVSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,984
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Product details
Overview
SN74CBT3245ADGVR from Texas Instruments is an octal FET bus switch IC designed for high-speed TTL-compatible bidirectional data routing between two 8-bit ports (A and B). It features 5-Ω typical on-state resistance, 0.25 ns propagation delay at VCC = 5 V, and operates over −40°C to 85°C. It enables low-latency signal isolation in memory address/data buses and hot-swap interfaces.
For engineers reviewing the SN74CBT3245ADGVR datasheet, SN74CBT3245ADGVR pinout, SN74CBT3245ADGVR application, or SN74CBT3245ADGVR equivalent, key selection criteria include on-resistance matching, OE-controlled bidirectional switching timing, TVSOP-20 thermal performance (θJA = 92°C/W), and compatibility with 4–5.5 V supply systems requiring minimal propagation delay and high-impedance isolation.
Technical Context
The SN74CBT3245ADGVR implements eight independent analog switches using NMOS FETs, each with symmetrical A↔B conduction when OE is low. Its TTL-compatible control input accepts VIH ≥ 2 V and VIL ≤ 0.8 V, enabling direct interfacing with legacy logic without level shifting.
Switch operation is strictly controlled by the active-low OE signal: low enables bidirectional connectivity with <7 Ω on-resistance; high forces both ports into high-impedance states. No internal pull-ups exist-external pull-up on OE to VCC is required to ensure defined high-impedance during power sequencing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4 V to 5.5 V - Supports standard 5-V TTL and mixed-voltage systems with margin for ripple. |
| ron (Typ) | 5 Ω - Enables <0.15 V drop at 30 mA per switch, preserving signal integrity in low-voltage data paths. |
| tpd (Max) | 0.35 ns at VCC = 4 V - Delivers sub-nanosecond latency critical for high-speed bus arbitration and clock-domain crossing. |
| ten / tdis (Max) | 6.4 ns / 6.0 ns - Ensures fast, predictable enable/disable transitions for dynamic bus partitioning. |
| IOFF Leakage | ±5 μA - Minimizes standby current and crosstalk between isolated ports in powered-down subsystems. |
| Operating Temp | −40°C to +85°C - Qualified for industrial-grade embedded control, communications backplanes, and test equipment. |
| Cio(OFF) | 4 pF - Limits capacitive loading on disabled ports, maintaining signal rise/fall times in multi-drop configurations. |
Pinout & Package
SN74CBT3245ADGVR uses a 20-pin TVSOP (Thin Very Small Outline Package) with 0.5 mm pitch, 6.6 mm × 4.4 mm body, and 1.2 mm max height. Pin 1 is located at top-left corner with index area marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8 | A1–A8 | Port A input/output terminals - Bidirectionally connected to B1–B8 when OE is low; high-Z when OE is high. |
| 9 | GND | Ground reference for all internal circuitry and switch channel return path. |
| 10 | VCC | Positive supply (4–5.5 V) powering internal bias and FET channels. |
| 11 | OE | Active-low output-enable control - Must be pulled high externally to guarantee high-impedance state at power-up. |
| 12, 13, 14, 15, 16, 17, 18, 19 | B1–B8 | Port B input/output terminals - Electrically mirrored to A1–A8 under OE control. |
| 20 | NC | No internal connection - Not bonded; must remain unconnected on PCB. |
Key Features
| Feature | Design Value |
|---|---|
| Standard '245 pinout | Enables drop-in replacement of legacy 74-series bus transceivers without PCB redesign. |
| TTL-compatible inputs | Accepts 0.8 V/2.0 V logic thresholds directly from 5-V microcontrollers and FPGAs-no level-shifter needed. |
| 5-Ω on-resistance | Reduces voltage drop and timing skew across all eight channels, supporting clean signal pass-through up to 100 MHz. |
| Sub-ns propagation delay | Ensures deterministic timing in synchronous bus architectures where setup/hold margins are tight. |
| High-impedance isolation | Guarantees >10⁹ Ω off-state resistance between ports, preventing leakage-induced contention in shared-bus systems. |
Applications
| Memory Address/Data Bus Isolation | Hot-Swappable Module Interface |
|---|---|
|
Use Scenario: Isolating CPU address/data lines from peripheral modules during insertion/removal in modular instrumentation racks. IC Role / Device Role / Timing Role: Bidirectional bus switch enabling live disconnection of memory-mapped peripherals while maintaining system stability. Use Value: Prevents bus contention and data corruption during hot-swap events via nanosecond-scale enable/disable control and guaranteed high-Z state. |
Use Scenario: Routing I²C or SMBus signals between host controller and field-replaceable sensor cards in industrial PLCs. IC Role / Device Role / Timing Role: Low-capacitance, low-resistance analog switch providing galvanic isolation between domains during card insertion. Use Value: 4 pF off-capacitance and 5 Ω on-resistance preserve signal edge rates and reduce bus pull-up load, ensuring reliable communication post-insertion. |
| Legacy Logic Level Translation | Test Access Port Multiplexing |
|
Use Scenario: Interfacing 5-V microcontroller GPIOs with 3.3-V FPGA configuration pins in mixed-voltage JTAG chains. IC Role / Device Role / Timing Role: Passive bidirectional switch acting as voltage-agnostic signal conduit without active translation logic. Use Value: Eliminates need for dedicated level shifters by leveraging FET-based conduction-preserves signal polarity and timing with no added propagation delay. |
Use Scenario: Sharing a single JTAG debug port among multiple ASICs on a high-density test board. IC Role / Device Role / Timing Role: High-speed multiplexer enabling sequential access to individual device TAP controllers via OE gating. Use Value: 0.25 ns tpd ensures minimal impact on JTAG clock timing; 6.4 ns ten allows precise windowing of TCK/TMS routing without violating protocol setup requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bus switching applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBTD3384ADW | Includes integrated 5-V tolerant level shifters; higher on-resistance (12 Ω typ); SOIC-24 package. | Suitable for mixed-voltage (3.3 V ↔ 5 V) translation where voltage domain bridging is required. | Select when level translation-not just switching-is needed; avoid if pure low-latency pass-through is prioritized. |
| SN74LVC245APW | True 8-bit transceiver with direction control (DIR); CMOS I/O; 3.3-V only; 3.5 ns tpd. | Used where unidirectional data flow and bus driving strength (24 mA) are required instead of passive switching. | Choose for active buffering and direction management; not interchangeable for bidirectional analog switching roles. |
Compared with SN74CBT3245ADGVR, SN74CBTD3384ADW adds voltage translation but sacrifices speed and on-resistance, while SN74LVC245APW provides drive capability and direction control at the cost of latency and passive switching behavior-making SN74CBT3245ADGVR optimal for ultra-low-delay, bidirectional, voltage-transparent bus isolation.
Availability
SN74CBT3245ADGVR is available at Aetrix Electronics and suitable for industrial control backplanes, modular test equipment, and hot-swap peripheral interfaces requiring stable component supply and verified TVSOP-20 sourcing.
Supply support for SN74CBT3245ADGVR 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 logic solutions with decades of industrial reliability validation.
The SN74CBT3245A family targets high-speed digital interconnect applications where minimal propagation delay, low on-resistance, and TTL-compatible control are essential-particularly in legacy-system upgrades and space-constrained PCBs.
FAQ
What is the maximum continuous current rating per channel for SN74CBT3245ADGVR?
The SN74CBT3245ADGVR supports up to 128 mA continuous channel current per switch, as specified in its absolute maximum ratings. This rating applies under steady-state conditions with proper thermal management. In practice, the 5 Ω on-resistance limits practical current to ~30 mA for <0.15 V drop-ensuring signal fidelity in data bus applications. Exceeding recommended operating conditions may degrade long-term reliability.
Does SN74CBT3245ADGVR require external pull-up resistors on the OE pin?
Yes, SN74CBT3245ADGVR requires an external pull-up resistor on the OE pin to VCC to ensure a defined high-impedance state during power-up and power-down sequences. The datasheet specifies that OE should be tied to VCC through a pull-up; minimum resistance depends on the driver's current-sinking capability. Failure to do so risks undefined switching states and potential bus contention.
Can SN74CBT3245ADGVR operate with a 3.3-V supply?
No, SN74CBT3245ADGVR is not rated for 3.3-V operation. Its recommended VCC range is 4 V to 5.5 V, and absolute maximum supply is 7 V. At 3.3 V, the internal FETs may not fully enhance, resulting in elevated on-resistance (>15 Ω), increased propagation delay, and unreliable switching-violating datasheet specifications. Use SN74LVC245A or similar 3.3-V logic for that voltage domain.
Is SN74CBT3245ADGVR pin-compatible with standard 74LS245 devices?
Yes, SN74CBT3245ADGVR uses the standard '245-type pinout across DB, DW, PW, DGV, and RGY packages, enabling mechanical and layout compatibility with legacy 74LS245 footprints. However, it is functionally distinct: SN74CBT3245ADGVR is a passive bidirectional switch (no direction control), whereas 74LS245 is an active transceiver with DIR input. Electrical interface and timing differ significantly.
What is the thermal resistance (θJA) of SN74CBT3245ADGVR in its TVSOP package?
The SN74CBT3245ADGVR in the TVSOP (DGV) package has a junction-to-ambient thermal resistance (θJA) of 92°C/W, as specified in the absolute maximum ratings table. This value assumes standard JEDEC high-K test board conditions. Actual board-level thermal performance depends on copper area, airflow, and adjacent heat sources-designers should verify temperature rise under worst-case load to maintain operation within −40°C to +85°C ambient range.
SN74CBT3245ADGVR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CBT
- Package/Case:
- 20-TFSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Bus Switch
- Circuit:
- 8 x 1:1
- Independent Circuits:
- 1
- Current - Output High, Low:
- -
- Voltage Supply Source:
- Single Supply
- Voltage - Supply:
- 4V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TVSOP
SN74CBT3245ADGVR FAQ
1.How can I place an order for SN74CBT3245ADGVR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CBT3245ADGVR 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 SN74CBT3245ADGVR reliable?
The price and inventory of SN74CBT3245ADGVR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBT3245ADGVR is usually 5 days.
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Once your SN74CBT3245ADGVR 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 SN74CBT3245ADGVR?
For technical support, including SN74CBT3245ADGVR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBT3245ADGVR requirements.
6.How does Aetrix verify that SN74CBT3245ADGVR is sourced from the original manufacturer or authorized distributors?
All SN74CBT3245ADGVR 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 SN74CBT3245ADGVR meets industry standards.
7.What is the process for return or replacement of SN74CBT3245ADGVR?
All SN74CBT3245ADGVR units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBT3245ADGVR, 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 SN74CBT3245ADGVR part is unused and in its original packaging.
Return procedure for SN74CBT3245ADGVR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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