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Texas Instruments SN74CBT3245ADGVRE4
- Part No.:
- SN74CBT3245ADGVRE4
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 20-TFSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74CBT3245ADGVRE4.pdf
- Description:
- IC SWITCH BUS FET OCTAL 20-TVSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,700
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Product details
Overview
SN74CBT3245ADGVRE4 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 on-state resistance, 0.25 ns typical propagation delay at 5 V, and operates over −40°C to 85°C with 4–5.5 V supply. It enables low-latency signal isolation in memory address/data bus switching applications.
For engineers reviewing the SN74CBT3245ADGVRE4 datasheet, SN74CBT3245ADGVRE4 pinout, SN74CBT3245ADGVRE4 application, or SN74CBT3245ADGVRE4 equivalent, key selection criteria include on-resistance matching, OE-controlled bidirectional isolation timing, thermal performance in TVSOP-20, and compatibility with legacy '245-pinout system designs.
Technical Context
The SN74CBT3245ADGVRE4 implements eight independent FET transmission gates controlled by a single active-low output-enable (OE) input. When OE is low, all A–B paths conduct with near-symmetric on-resistance (5–7 Ω), enabling bidirectional signal flow without direction control logic. The device uses TTL-compatible input thresholds (VIL ≤ 0.8 V, VIH ≥ 2 V) and supports hot-swap operation when OE is pulled up to VCC via external resistor.
Its architecture eliminates latch-up risk and provides high-impedance isolation (>10⁹ Ω off-state) between ports during power-up/down sequences. The internal FET structure ensures minimal charge injection and capacitive coupling-critical for low-noise data bus switching in mixed-signal systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| On-state resistance (ron) | 5–7 Ω at VCC = 4.5 V - ensures <10 mV voltage drop at 30 mA per channel, preserving signal integrity in 3.3 V/5 V buses. |
| Propagation delay (tpd) | 0.25 ns typical at VCC = 5 V - enables sub-nanosecond data path switching for high-frequency address/data multiplexing. |
| Supply voltage range | 4–5.5 V - compatible with both 5 V TTL and 3.3 V–5 V mixed-voltage system interfaces. |
| Input threshold (VIH/VIL) | VIH ≥ 2 V, VIL ≤ 0.8 V - guarantees reliable logic-level recognition from standard TTL and CMOS drivers. |
| Off-state capacitance (Cio) | 4 pF - minimizes capacitive loading and crosstalk between isolated A/B ports during disable state. |
| Operating temperature | −40°C to +85°C - qualified for industrial-grade embedded and communications equipment environments. |
| Package thermal impedance (θJA) | 92°C/W (TVSOP-DGV) - defines maximum power dissipation limit (~120 mW at ΔT = 11°C rise) under natural convection. |
Pinout & Package
SN74CBT3245ADGVRE4 is housed in a 20-pin Thin Very Small Outline Package (TVSOP-DGV), 4.4 mm × 6.5 mm body, 0.5 mm pitch, 1.2 mm max height, with exposed pad for thermal enhancement. Pin 1 index located at top-left corner of package marking area.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8 | A1–A8 inputs/outputs | Port A side of bidirectional switch; electrically identical to B pins; no directionality imposed by IC. |
| 9 | GND | Ground reference for all internal circuitry and substrate bias; must be low-impedance connection. |
| 10 | VCC | Positive supply rail (4–5.5 V); powers internal FET gate drive and level-shifting circuitry. |
| 11 | OE | Active-low output-enable control; drives all eight switches simultaneously; requires pull-up to VCC for power-up safety. |
| 12, 13, 14, 15, 16, 17, 18, 19 | B1–B8 inputs/outputs | Port B side of bidirectional switch; symmetric with A pins; no internal buffering or inversion. |
| 20 | NC | No internal connection; left unconnected per TI datasheet; not used for thermal or electrical purposes. |
Key Features
| Feature | Design Value |
|---|---|
| Standard '245-type pinout | Enables drop-in replacement for legacy 74LS245/74ACT245 in existing PCB layouts without redesign. |
| TTL-compatible control inputs | Eliminates need for level shifters when interfacing with 5 V microcontrollers or FPGA I/O banks. |
| 5-Ω low on-state resistance | Reduces insertion loss and maintains signal edge fidelity in high-speed parallel bus applications up to 100 MHz. |
| High-impedance isolation during power sequencing | Prevents back-driving or contention on A/B buses during cold-start or brownout conditions when OE tied to VCC. |
| Hot-swap capable | Supports live insertion into powered backplanes when OE is externally held high until stable VCC is established. |
Applications
| Memory Address Multiplexing | PCI/ISA Bus Isolation |
|---|---|
|
Use Scenario: Isolating address lines between CPU and multiple memory banks in embedded controllers. IC Role / Device Role / Timing Role: Bidirectional bus switch enabling time-multiplexed access to SRAM/Flash while preventing bus contention. Use Value: 5-Ω Ron and 0.25 ns tpd preserve setup/hold timing margins across 8-bit address paths at 50 MHz clock rates. |
Use Scenario: Segmenting legacy PCI or ISA expansion bus signals between host and peripheral cards. IC Role / Device Role / Timing Role: OE-controlled isolation barrier that decouples noise and ground bounce between subsystems. Use Value: 4 pF Cio(OFF) minimizes inter-segment capacitive coupling, reducing signal integrity degradation in multi-slot systems. |
| FPGA I/O Expansion | Test Equipment Signal Routing |
|
Use Scenario: Expanding limited FPGA I/O count by sharing bidirectional data lines among multiple peripherals. IC Role / Device Role / Timing Role: Low-latency, direction-transparent switch allowing FPGA to drive or sample same physical traces. Use Value: Symmetric A/B terminals and TTL-compatible inputs eliminate external direction control logic, simplifying HDL interface design. |
Use Scenario: Configurable signal path selection in automated test equipment (ATE) for DUT stimulus/response routing. IC Role / Device Role / Timing Role: Precision analog-grade switch providing repeatable, low-distortion path selection under digital control. Use Value: <10 mV on-state voltage drop at 30 mA ensures accurate DC-level translation and minimal gain error in measurement channels. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bus switching applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBTD3384CDWRE4 | Higher Ron (7–10 Ω), dual 4-bit configuration, separate OE per 4-bit group. | Supports independent enable control for two 4-bit subsets; less suitable for full 8-bit synchronized switching. | Choose when granular port control is required over unified 8-bit operation. |
| SN74LVC245APWRE4 | CMOS-based, higher Ron (15–25 Ω), 3.3 V only, no 5 V tolerance. | Limited to 3.3 V systems; lacks TTL input compatibility and hot-swap robustness. | Prefer only in cost-sensitive, low-power 3.3 V-only designs where speed and voltage flexibility are secondary. |
Compared with SN74CBT3245ADGVRE4, SN74CBTD3384CDWRE4 offers finer enable granularity but sacrifices uniform 8-bit latency, while SN74LVC245APWRE4 reduces cost and power at the expense of voltage range, speed, and interoperability with 5 V logic.
Availability
SN74CBT3245ADGVRE4 is available at Aetrix Electronics and suitable for industrial control systems, legacy bus interface upgrades, and FPGA-based prototyping platforms requiring stable component supply and long-term obsolescence management.
Supply support for SN74CBT3245ADGVRE4 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 connectivity technologies, with decades of experience in high-reliability logic and interface solutions.
The SN74CBT3245A family was engineered for high-speed, low-distortion bus switching in industrial, computing, and communications infrastructure-prioritizing signal fidelity, pinout compatibility, and robust power sequencing behavior.
FAQ
What is the recommended pull-up resistor value for OE on SN74CBT3245ADGVRE4?
The OE pin must be pulled up to VCC to ensure high-impedance state at power-up. TI specifies minimum pull-up resistance based on driver sink capability; for standard TTL drivers, a 4.7 kΩ resistor is typical. For stronger sinks (e.g., microcontroller GPIO), values down to 1 kΩ maintain noise margin while ensuring fast disable timing. Always verify against actual driver specs in your system.
Can SN74CBT3245ADGVRE4 operate with 3.3 V supply?
No-SN74CBT3245ADGVRE4 requires VCC between 4 V and 5.5 V per its recommended operating conditions. At 3.3 V, the internal FET gate drive is insufficient, resulting in elevated on-resistance (>20 Ω), increased propagation delay (>2 ns), and unreliable switching. Use SN74LVC245A or SN74AVC245 for true 3.3 V operation.
Is SN74CBT3245ADGVRE4 pin-compatible with older SN74CBT3245ADW?
Yes-SN74CBT3245ADGVRE4 (TVSOP-DGV) shares identical pin numbering and function mapping with SN74CBT3245ADW (SOIC-DW) and SN74CBT3245ADBR (SSOP-DB), per TI's standard '245-type pinout. However, PCB footprint and soldering process differ due to package geometry and pitch; layout adaptation is required despite functional equivalence.
Does SN74CBT3245ADGVRE4 support hot-plug insertion?
Yes-when OE is held high (via pull-up) before VCC ramp-up, SN74CBT3245ADGVRE4 remains in high-impedance state during power sequencing, preventing back-drive or bus contention. This enables safe insertion into live backplanes or hot-swap carrier cards, provided OE control logic is synchronized with power rails.
What is the maximum continuous current per channel for SN74CBT3245ADGVRE4?
The absolute maximum continuous channel current is 128 mA, but TI recommends limiting steady-state current to ≤64 mA per A/B path to maintain junction temperature within safe limits under worst-case thermal conditions (θJA = 92°C/W). Derating is essential in high-density layouts or elevated ambient temperatures.
SN74CBT3245ADGVRE4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CBT
- Package/Case:
- 20-TFSOP (0.173", 4.40mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Type:
- FET 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
SN74CBT3245ADGVRE4 FAQ
1.How can I place an order for SN74CBT3245ADGVRE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CBT3245ADGVRE4 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 SN74CBT3245ADGVRE4 reliable?
The price and inventory of SN74CBT3245ADGVRE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBT3245ADGVRE4 is usually 5 days.
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Once your SN74CBT3245ADGVRE4 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 SN74CBT3245ADGVRE4?
For technical support, including SN74CBT3245ADGVRE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBT3245ADGVRE4 requirements.
6.How does Aetrix verify that SN74CBT3245ADGVRE4 is sourced from the original manufacturer or authorized distributors?
All SN74CBT3245ADGVRE4 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 SN74CBT3245ADGVRE4 meets industry standards.
7.What is the process for return or replacement of SN74CBT3245ADGVRE4?
All SN74CBT3245ADGVRE4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBT3245ADGVRE4, 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 SN74CBT3245ADGVRE4 part is unused and in its original packaging.
Return procedure for SN74CBT3245ADGVRE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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