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Texas Instruments SN74CBTS3306DR
- Part No.:
- SN74CBTS3306DR
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SN74CBTS3306DR.pdf
- Description:
- IC BUS SWITCH 1 X 1:1 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,978
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Product details
Overview
SN74CBTS3306DR from Texas Instruments is a dual 1-bit bus switch IC with independent TTL-compatible enable control, 5-Ω on-state resistance, Schottky-clamped I/Os for undershoot protection, and operation across −40°C to 85°C - used in high-speed data path isolation and level-shifting between mixed-voltage logic domains.
For engineers reviewing the SN74CBTS3306DR datasheet, SN74CBTS3306DR pinout, SN74CBTS3306DR application, or SN74CBTS3306DR equivalent, key selection criteria include on-resistance matching, enable timing (ten/tdis < 5.6 ns), low off-capacitance (6 pF), rail-to-rail signal pass-through capability, and SOIC-8 package compatibility with legacy board layouts.
Technical Context
This device implements two independent bidirectional analog switches controlled by separate OE inputs, each enabling direct A↔B signal conduction when OE is low. The internal architecture uses NMOS pass transistors with integrated Schottky clamps on all I/O pins to suppress negative undershoot below −1.2 V.
It operates from 4 V to 5.5 V supply, supports TTL-level control inputs (VIH ≥ 2 V, VIL ≤ 0.8 V), and delivers sub-nanosecond propagation delay (tpd ≤ 0.35 ns at VCC = 4 V) under 50-pF load - optimized for hot-swap, memory address/data gating, and JTAG boundary-scan isolation applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| On-state resistance (ron) | 5 Ω typical - ensures minimal voltage drop and signal distortion for 3.3-V/5-V digital signals up to 128 mA per channel. |
| Supply voltage range (VCC) | 4 V to 5.5 V - compatible with standard 5-V logic rails and tolerant of 4-V industrial supplies. |
| Enable timing (ten / tdis) | 5.6 ns / 4.6 ns max at VCC = 4 V - enables fast channel activation/deactivation for dynamic bus arbitration. |
| Off-state capacitance (Cio(OFF)) | 6 pF - minimizes capacitive loading and crosstalk when switch is disabled. |
| Input clamp voltage (VIK) | −1.2 V at II = −18 mA - protects downstream logic from −1.2 V undershoot transients via integrated Schottky diodes. |
| Operating temperature | −40°C to 85°C - qualified for industrial-grade embedded systems and communications equipment. |
| Package | SOIC-8 (D package) - industry-standard 150-mil body with 1.27-mm pitch, JEDEC MS-012 compliant. |
Pinout & Package
SN74CBTS3306DR is housed in an 8-pin SOIC (D) package with 1.27-mm lead pitch and 1.75-mm maximum height. Pin 1 is located at the top-left corner adjacent to the notch or dot marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (1OE) | Channel 1 output-enable input | Active-low control: drives 1A↔1B path when low; high-impedance isolation when high. |
| 2 (1A) | Channel 1 port A terminal | Bidirectional signal node connected directly to internal pass transistor; supports rail-to-rail voltage swing. |
| 3 (1B) | Channel 1 port B terminal | Bidirectional signal node; electrically identical to 1A with matched on-resistance and capacitance. |
| 4 (GND) | Ground reference | Primary return path for supply current and I/O clamp currents; must be low-impedance for noise immunity. |
| 5 (2OE) | Channel 2 output-enable input | Independent active-low enable for second switch; allows asynchronous control of dual channels. |
| 6 (2A) | Channel 2 port A terminal | Second bidirectional I/O node; fully isolated from Channel 1 except shared VCC/GND. |
| 7 (2B) | Channel 2 port B terminal | Second bidirectional I/O node; supports same electrical characteristics as 1A/1B. |
| 8 (VCC) | Positive supply | Power rail for internal logic and pass transistors; bypass capacitor required near pin for switching stability. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent bus switches | Enables simultaneous but separately controlled signal routing on two channels without interference. |
| TTL-compatible control inputs | Accepts standard 5-V TTL logic levels (VIH ≥ 2 V, VIL ≤ 0.8 V) without level translation circuitry. |
| Schottky-clamped I/Os | Prevents negative undershoot beyond −1.2 V during fast edge transitions, protecting connected logic. |
| Low on-state resistance (5 Ω typ) | Maintains signal integrity for high-speed digital buses (e.g., address/data lines) with minimal RC delay. |
| Fast enable/disable timing | Sub-5-ns enable/disable delays support real-time bus arbitration and hot-plug detection circuits. |
Applications
| Memory Address Gating | JTAG Boundary-Scan Isolation |
|---|---|
|
Use Scenario: Isolating address lines between microcontroller and external SRAM/Flash during power-down or configuration mode. IC Role / Device Role / Timing Role: Bidirectional analog switch enabling/disabling address path under firmware-controlled OE signals. Use Value: Prevents back-driving and leakage current into powered-down memory while maintaining full-speed access during active operation. |
Use Scenario: Inserting test access points into JTAG TDI/TDO paths without disrupting normal debug functionality. IC Role / Device Role / Timing Role: Signal-pass-through gate activated only during test mode to insert boundary-scan logic. Use Value: Enables non-intrusive test insertion with <5 ns enable latency and <6 pF off-capacitance to preserve signal integrity. |
| Hot-Swap Bus Arbitration | Mixed-Voltage Logic Interface |
|
Use Scenario: Safely connecting/disconnecting peripheral modules in live 5-V backplane systems. IC Role / Device Role / Timing Role: Controlled signal isolation point that blocks transients during plug/unplug events. Use Value: Schottky clamps limit undershoot to −1.2 V, preventing latch-up in host-side logic during hot-insertion. |
Use Scenario: Interfacing 3.3-V FPGA I/O banks with 5-V sensor or display drivers. IC Role / Device Role / Timing Role: Passive voltage-tolerant signal bridge with no level translation overhead. Use Value: Supports rail-to-rail signal transmission across voltage domains without added propagation delay or power consumption. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBT3306D | Same pinout and function but lacks Schottky clamps on I/Os; higher undershoot vulnerability (VIK = −0.7 V). | Not suitable for hot-swap or noisy environments where undershoot exceeds −0.7 V. | Select SN74CBTS3306DR when robust transient suppression is required. |
| 74LVC1G3157DBVR | Single-channel, 3.3-V only supply (1.65–5.5 V); lower on-resistance (3.5 Ω), but no integrated undershoot clamps. | Requires external protection diodes for undershoot control; limited to single-path use. | Choose for space-constrained designs needing lower Ron, but add discrete clamping if undershoot > −0.5 V. |
Compared with SN74CBT3306D and 74LVC1G3157DBVR, SN74CBTS3306DR uniquely combines dual-channel operation, 5-Ω Ron, and −1.2-V I/O clamping in a standard SOIC-8 package - making it optimal for industrial hot-swap and mixed-rail isolation where reliability trumps minimal footprint.
Availability
SN74CBTS3306DR is available at Aetrix Electronics and suitable for memory subsystems, JTAG test infrastructure, hot-swap backplanes, and mixed-voltage interface designs requiring stable component supply and long-term industrial availability.
Supply support for SN74CBTS3306DR 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 over 90 years of innovation in industrial, automotive, and communications markets.
The SN74CBTS3306DR belongs to TI's CBTS-series bus switch family, designed specifically for high-speed, low-distortion signal routing in industrial control, test equipment, and programmable logic interfaces.
FAQ
What is the maximum continuous current rating per channel for the SN74CBTS3306DR?
The SN74CBTS3306DR supports a continuous channel current of 128 mA per switch path, verified under recommended operating conditions (VCC = 4–5.5 V, TA = −40°C to 85°C). This rating ensures reliable conduction for standard 5-V digital bus signals without thermal derating in typical PCB layouts with adequate copper area.
Does the SN74CBTS3306DR require external pull-up or pull-down resistors on its OE inputs?
No - the SN74CBTS3306DR OE inputs are TTL-compatible and internally biased; however, TI recommends tying unused OE inputs directly to VCC or GND to prevent floating states that may cause unintended switching. External resistors are unnecessary unless interfacing with open-drain controllers.
Can the SN74CBTS3306DR operate with a 3.3-V supply voltage?
No - the SN74CBTS3306DR has a minimum recommended VCC of 4 V per the datasheet. Operation below 4 V is not characterized and may result in undefined switching behavior, increased on-resistance, or failure to meet timing specifications. For 3.3-V systems, consider TI's LVC-series alternatives.
What is the purpose of the Schottky diodes integrated into the SN74CBTS3306DR I/O pins?
The Schottky diodes in the SN74CBTS3306DR provide undershoot clamping down to −1.2 V (at −18 mA), protecting connected logic devices from negative voltage transients caused by fast edge rates or inductive coupling. This feature eliminates the need for external clamping diodes in hot-swap and high-noise industrial environments.
Is the SN74CBTS3306DR pin-compatible with other members of the SN74CBTS3306 family?
Yes - the SN74CBTS3306DR shares identical pinout, electrical behavior, and functional operation with SN74CBTS3306D, SN74CBTS3306PW, and SN74CBTS3306PWR. Only packaging (SOIC vs. TSSOP) and reel quantity differ; all variants use the same D or PW package drawings and top-side marking "CR306".
SN74CBTS3306DR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CBTS
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Bus Switch
- Circuit:
- 1 x 1:1
- Independent Circuits:
- 2
- Current - Output High, Low:
- -
- Voltage Supply Source:
- Single Supply
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
SN74CBTS3306DR FAQ
1.How can I place an order for SN74CBTS3306DR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CBTS3306DR 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 SN74CBTS3306DR reliable?
The price and inventory of SN74CBTS3306DR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBTS3306DR is usually 5 days.
3.What payment methods are accepted for SN74CBTS3306DR?
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SN74CBTS3306DR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74CBTS3306DR 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 SN74CBTS3306DR?
For technical support, including SN74CBTS3306DR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBTS3306DR requirements.
6.How does Aetrix verify that SN74CBTS3306DR is sourced from the original manufacturer or authorized distributors?
All SN74CBTS3306DR 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 SN74CBTS3306DR meets industry standards.
7.What is the process for return or replacement of SN74CBTS3306DR?
All SN74CBTS3306DR units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBTS3306DR, 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 SN74CBTS3306DR part is unused and in its original packaging.
Return procedure for SN74CBTS3306DR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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