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Texas Instruments SN74CBT3384ADBR
- Part No.:
- SN74CBT3384ADBR
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 24-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
SN74CBT3384ADBR.pdf
- Description:
- IC BUS SWITCH 5 X 1:1 24SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,000
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Product details
Overview
SN74CBT3384ADBR from Texas Instruments is a 10-bit FET bus switch organized as two independent 5-bit switches with separate OE controls, featuring 5 Ω on-state resistance, TTL-compatible input levels, and sub-0.35 ns propagation delay at 4 V supply - used for high-speed bidirectional data routing in memory expansion and peripheral interface circuits.
For engineers reviewing the SN74CBT3384ADBR datasheet, SN74CBT3384ADBR pinout, SN74CBT3384ADBR application, or SN74CBT3384ADBR equivalent, this page delivers verified electrical parameters, package-specific thermal data (63°C/W θJA), functional truth table behavior, and real-world switching timing under 50 pF load conditions.
Technical Context
The SN74CBT3384ADBR implements dual 5-bit FET-based analog switches with independent active-low output-enable (OE) inputs. Each switch section connects port A to port B when its OE is low, presenting high-impedance isolation when OE is high - enabling bidirectional signal flow without direction control logic.
It operates across 4 V to 5.5 V supply range with TTL-level compatible control inputs (VIL ≤ 0.8 V, VIH ≥ 2 V), supports ±128 mA continuous channel current per switch, and maintains low input capacitance (4 pF) and off-state I/O capacitance (4.5 pF) to minimize loading on high-speed buses.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| On-state resistance (ron) | 5 Ω typical at VCC = 4.5 V - ensures minimal voltage drop and signal attenuation during data transfer. |
| Propagation delay (tpd) | 0.35 ns max at VCC = 4 V, CL = 50 pF - enables operation in >1 GHz digital systems with negligible timing skew. |
| Supply voltage range | 4 V to 5.5 V - compatible with standard 5 V TTL and mixed-voltage 4.5–5.5 V system rails. |
| Input voltage compatibility | VIL ≤ 0.8 V, VIH ≥ 2 V - directly interfaces with legacy TTL outputs without level-shifting circuitry. |
| Thermal resistance (θJA) | 63°C/W for SSOP-DB package - defines maximum power dissipation limit (≈160 mW at 85°C ambient) for thermal design. |
| Channel current rating | ±128 mA continuous - supports robust driving of terminated transmission lines and capacitive loads up to 50 pF. |
| Off-state I/O capacitance | 4.5 pF - minimizes crosstalk and signal integrity degradation when switches are disabled. |
Pinout & Package
SN74CBT3384ADBR uses a 24-pin SSOP (Shrink Small-Outline Package) with 0.65 mm lead pitch, 7.9 mm × 6.2 mm body size, and 1.2 mm max height - optimized for high-density PCB layouts while maintaining hand-solderability and reflow compatibility.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE | Output-enable for first 5-bit switch (1A1–1A5 ↔ 1B1–1B5) | Active-low control: drives switch ON when low; isolates ports when high. |
| 2OE | Output-enable for second 5-bit switch (2A1–2A5 ↔ 2B1–2B5) | Independent enable allows time-multiplexed or partitioned bus access. |
| 1A1–1A5, 2A1–2A5 | Port A terminals (first and second 5-bit groups) | Bidirectional I/O pins - no intrinsic directionality; signal flows A→B or B→A based on OE state. |
| 1B1–1B5, 2B1–2B5 | Port B terminals (first and second 5-bit groups) | Paired with respective A ports; identical electrical characteristics and routing capability. |
| VCC | Positive supply rail | Must be decoupled locally; powers internal FET gate drivers and bias networks. |
| GND | Ground reference | Common return path for all switch channels and control logic; critical for noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent 5-bit bus switches | Enables split-bus architectures - e.g., isolate memory address vs. data lanes with separate timing control. |
| 5 Ω low on-resistance | Reduces insertion loss to <0.1 dB at 100 MHz, preserving signal integrity in high-speed parallel interfaces. |
| TTL-compatible control inputs | Eliminates need for external level translators when interfacing with 74LS/74ALS logic families. |
| Sub-nanosecond propagation delay | Supports clock rates >1 GHz in point-to-point or stubbed bus topologies without added timing budget overhead. |
| High-impedance isolation when disabled | Input/output leakage <±1 μA ensures no DC loading on inactive bus segments - essential for hot-swap and power-gating designs. |
Applications
| Memory Expansion Interface | Peripheral Multiplexing |
|---|---|
|
Use Scenario: Expanding 16-bit data bus from microcontroller to multiple SRAM banks using shared address/data lines. IC Role / Device Role / Timing Role: Bidirectional bus switch enabling time-division multiplexing between memory devices without tristate contention. Use Value: Eliminates need for discrete transceivers or complex bus arbitration logic while maintaining <0.35 ns timing margin. |
Use Scenario: Sharing a single UART or SPI controller among multiple sensors or actuators via software-selectable routing. IC Role / Device Role / Timing Role: Signal path selector that preserves protocol timing integrity during dynamic peripheral reconfiguration. Use Value: Enables zero-latency bus reassignment with no hold-time violations or signal reflections due to 5 Ω ron and 4.5 pF Cio(OFF). |
| Legacy System Bus Bridging | Test Access Port (TAP) Isolation |
|
Use Scenario: Interfacing modern FPGA I/O banks (3.3 V tolerant) with legacy 5 V TTL peripherals in industrial controllers. IC Role / Device Role / Timing Role: Level-agnostic analog pass gate supporting bidirectional 5 V signaling without clamping diodes or voltage translation. Use Value: Maintains full 5 V logic swing and drive strength while avoiding signal distortion from series resistors or active translators. |
Use Scenario: Isolating JTAG TCK/TMS/TDI/TDO signals between production test fixtures and embedded processors during board bring-up. IC Role / Device Role / Timing Role: Controlled signal barrier preventing fixture-induced noise coupling into debug interface during functional testing. Use Value: Guarantees clean edge transitions (<0.35 ns tpd) and <1 μA leakage during isolation - critical for IEEE 1149.1 compliance verification. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar FET bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBTD3384ADBR | Includes power-down control (1.8 V compatible OE) and lower ron (3.5 Ω), but requires VCC ≥ 4.5 V for full spec compliance. | Better suited for mixed-voltage systems with 1.8 V control logic; not drop-in for pure 5 V TTL environments. | Select SN74CBTD3384ADBR only if 1.8 V OE compatibility and sub-4 Ω ron are required - otherwise SN74CBT3384ADBR offers broader 4–5.5 V margin. |
| 74LVC1G3157DCKR | Single-pole double-throw (SPDT) switch, 5 V tolerant, 6 Ω ron, but only 1 channel - lacks 10-bit parallel structure. | Applicable only for point-to-point signal routing, not multi-bit bus applications requiring simultaneous channel control. | Use 74LVC1G3157DCKR for isolated signal path selection; SN74CBT3384ADBR remains necessary for parallel 10-bit data switching. |
Compared with SN74CBTD3384ADBR and 74LVC1G3157DCKR, the SN74CBT3384ADBR uniquely balances 10-bit parallel switching, TTL-level compatibility, and 5 Ω ron within a single SSOP-24 package - making it irreplaceable for legacy bus expansion where pin count, timing, and voltage compatibility are jointly constrained.
Availability
SN74CBT3384ADBR is available at Aetrix Electronics and suitable for memory expansion interfaces, peripheral multiplexing, legacy system bus bridging, and JTAG test access port isolation requiring stable component supply across industrial temperature ranges (−40°C to +85°C).
Supply support for SN74CBT3384ADBR 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 50 years of innovation in high-reliability logic and interface solutions.
The SN74CBT3384ADBR belongs to TI's CBT (Crosspoint Bus Transceiver) family - designed specifically for high-speed, low-distortion bidirectional bus switching in computing, communications, and industrial control systems.
FAQ
What is the maximum operating frequency supported by SN74CBT3384ADBR in a 50 pF load configuration?
The SN74CBT3384ADBR achieves a propagation delay of 0.35 ns (max) at VCC = 4 V with CL = 50 pF, corresponding to an effective small-signal bandwidth exceeding 1 GHz. This enables reliable operation in DDR1/DDR2 address/control bus applications and high-speed parallel test interfaces where timing margins are sub-nanosecond.
Does SN74CBT3384ADBR support hot insertion or live bus swapping?
Yes - the SN74CBT3384ADBR features powered-off protection: when VCC = 0 V, all I/O pins exhibit high-impedance behavior with ≤±1 μA leakage, and input clamp current rating (−50 mA) prevents damage during hot-plug events. This makes SN74CBT3384ADBR suitable for field-replaceable module designs requiring live bus reconfiguration.
Can SN74CBT3384ADBR be used with 3.3 V control signals while operating at 5 V VCC?
No - SN74CBT3384ADBR requires TTL-compatible control voltages: VIL ≤ 0.8 V and VIH ≥ 2 V. While 3.3 V logic outputs typically exceed VIH, they may violate absolute maximum ratings if pulled above VCC + 0.5 V. For 3.3 V control, use SN74CBTD3384ADBR instead, which specifies 1.8 V–5.5 V OE compatibility.
What is the thermal derating limit for continuous operation of SN74CBT3384ADBR at 85°C ambient?
With θJA = 63°C/W and maximum junction temperature TJ(max) = 150°C, the SN74CBT3384ADBR supports up to 1.03 W total power dissipation at 85°C ambient. At typical ron = 5 Ω and 64 mA per channel, worst-case power per switch is ~20 mW - well within safe limits even with all 10 channels active simultaneously.
Is SN74CBT3384ADBR RoHS compliant and what is its moisture sensitivity level?
Yes - SN74CBT3384ADBR is RoHS compliant (lead-free NiPdAu finish) and rated MSL Level-1 (unlimited floor life at ≤30°C/60% RH), per JEDEC J-STD-020. Its SSOP-DB package is qualified for peak reflow temperatures up to 260°C, making it compatible with standard lead-free assembly processes without baking requirements.
SN74CBT3384ADBR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CBT
- Package/Case:
- 24-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Bus Switch
- Circuit:
- 5 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:
- 24-SSOP
SN74CBT3384ADBR FAQ
1.How can I place an order for SN74CBT3384ADBR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CBT3384ADBR 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 SN74CBT3384ADBR reliable?
The price and inventory of SN74CBT3384ADBR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBT3384ADBR is usually 5 days.
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SN74CBT3384ADBR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74CBT3384ADBR 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 SN74CBT3384ADBR?
For technical support, including SN74CBT3384ADBR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBT3384ADBR requirements.
6.How does Aetrix verify that SN74CBT3384ADBR is sourced from the original manufacturer or authorized distributors?
All SN74CBT3384ADBR 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 SN74CBT3384ADBR meets industry standards.
7.What is the process for return or replacement of SN74CBT3384ADBR?
All SN74CBT3384ADBR units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBT3384ADBR, 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 SN74CBT3384ADBR part is unused and in its original packaging.
Return procedure for SN74CBT3384ADBR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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