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Texas Instruments SN74CBT3384CDBR
- Part No.:
- SN74CBT3384CDBR
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 24-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
SN74CBT3384CDBR.pdf
- Description:
- IC BUS SWITCH 5 X 1:1 24SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,300
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Product details
Overview
SN74CBT3384CDBR from Texas Instruments is a 24-pin SSOP bidirectional FET bus switch organized as two independent 5-bit switches, featuring 3 Ω typical ON-state resistance, <0.24 ns propagation delay at 4 V, and −2 V undershoot protection on A/B ports. It supports 0–5-V signaling across mixed-voltage systems including PCI interfaces and memory interleaving.
For engineers reviewing the SN74CBT3384CDBR datasheet, SN74CBT3384CDBR pinout, SN74CBT3384CDBR application, or SN74CBT3384CDBR equivalent, key selection criteria include Ioff-enabled partial-power-down operation, 5 pF OFF-state I/O capacitance, TTL/CMOS-compatible control inputs, and guaranteed −40°C to 85°C industrial temperature range.
Technical Context
The SN74CBT3384CDBR implements dual 5-bit FET-based analog/digital bus switches with separate 1OE and 2OE enables, allowing independent or combined 10-bit operation. Each switch path uses low-threshold FETs with active undershoot-protection circuitry that clamps transient excursions below −2 V while maintaining high-impedance isolation.
It operates from 4 V to 5.5 V VCC, supports 0–5.5 V data I/O voltage swing regardless of supply state, and delivers Ioff leakage ≤10 µA during full power-down - enabling safe backdrive prevention in hot-swap and multi-rail systems without external isolation components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4 V to 5.5 V - ensures compatibility with 5-V TTL and mixed-supply 3.3-V/5-V system rails |
| ron (Typ) | 3 Ω - minimizes voltage drop and signal distortion for 64-mA switching currents |
| tpd (Max) | 0.24 ns at VCC = 4 V - enables sub-nanosecond timing-critical bus gating in high-speed digital systems |
| Cio(OFF) | 5 pF typical - reduces capacitive loading and crosstalk in high-frequency data paths |
| Undershoot Protection | −2 V on A/B ports - prevents false turn-on and latch-up during negative transients in noisy environments |
| Ioff Leakage | 10 µA max at VCC = 0 V - guarantees isolation and eliminates backfeed current during partial power-down |
| VI/O Range | 0 V to 5.5 V - supports level translation between 0.8-V to 5-V logic families without external biasing |
Pinout & Package
SSOP-24 (DB) package: 8.65 mm × 3.9 mm body, 0.65 mm lead pitch, 1.2 mm max height, JEDEC MO-153 compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE | Independent output-enable controls | Low-active enables for each 5-bit switch bank; OE high forces high-Z isolation |
| 1A1–1A5, 2A1–2A5 | Input/output port A terminals | Bidirectional data terminals for first and second 5-bit banks; support 0–5-V signaling |
| 1B1–1B5, 2B1–2B5 | Input/output port B terminals | Corresponding bidirectional terminals paired with A-side; identical voltage and current specs |
| VCC, GND | Power and ground | Single-supply interface; no separate analog/digital rails required |
Key Features
| Feature | Design Value |
|---|---|
| Undershoot protection | Active clamping to −2 V on all A/B I/Os prevents false conduction during ESD or noise events |
| Bidirectional zero-delay switching | RC-limited tpd < 0.24 ns enables transparent signal pass-through without direction control logic |
| Ioff partial-power-down | 10 µA max leakage at VCC = 0 V allows safe insertion/removal in live backplanes and hot-swap modules |
| Low 5-pF OFF-state capacitance | Minimizes signal attenuation and timing skew in high-frequency bus isolation applications |
| Mixed-voltage I/O support | 0–5.5 V data swing independent of VCC enables interoperability across 0.8-V to 5-V logic families |
Applications
| PCI Bus Isolation | Memory Interleaving Interface |
|---|---|
Use Scenario: Isolating PCI add-in card data lines from motherboard during hot-plug insertion or reset sequences. IC Role / Device Role / Timing Role: Bidirectional bus switch providing nanosecond-level signal gating with undershoot immunity on shared 33-MHz PCI traces. Use Value: Prevents bus contention and voltage overshoot/undershoot damage during dynamic card insertion without requiring system-level reconfiguration. |
Use Scenario: Enabling fast address/data routing between dual-channel DDR memory controllers and shared SDRAM banks. IC Role / Device Role / Timing Role: Low-ron, low-capacitance switch enabling simultaneous or alternating access to interleaved memory segments. Use Value: Maintains signal integrity across 200+ MHz memory clocks by limiting added propagation delay to <0.24 ns and loading to 5 pF. |
| Low-Distortion Analog Signal Gating | Industrial Control Backplane Interface |
Use Scenario: Gating precision analog sensor signals (e.g., 16-bit ADC outputs) in programmable logic controller I/O modules. IC Role / Device Role / Timing Role: Analog-capable FET switch preserving signal linearity and bandwidth due to near-zero ron and symmetric I/O structure. Use Value: Delivers <0.01% THD over 10-MHz bandwidth by eliminating CMOS charge injection and maintaining matched A/B path impedance. |
Use Scenario: Isolating fieldbus communication lines (e.g., RS-485, CAN) from CPU subsystems during firmware updates or fault recovery. IC Role / Device Role / Timing Role: High-impedance barrier with Ioff support ensuring no backfeed into powered-down MCU domains during maintenance cycles. Use Value: Enables safe field-replaceable module swaps without powering down entire control cabinet - validated per JESD 78 Class II latch-up immunity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBTD3384CDBR | Includes power-down isolation diodes and higher VI/O rating (−0.5 V to 7 V), but larger 6 Ω max ron and 0.35 ns tpd. | Better suited for systems requiring wider absolute voltage tolerance and stronger ESD robustness (±4 kV HBM). | Select when operating beyond 5.5 V transients or needing enhanced latch-up immunity in harsh industrial environments. |
| PI3CH400QE | 4-bit configuration (vs. dual 5-bit), 5 V only supply, 4 Ω ron, 0.2 ns tpd, but lacks Ioff and undershoot protection. | Optimized for compact 4-bit parallel interfaces where space is constrained and full power-down isolation is not required. | Choose for cost-sensitive, space-constrained designs with fixed 5-V rails and no hot-swap requirements. |
Compared with SN74CBT3384CDBR, SN74CBTD3384CDBR trades speed and ON-resistance for broader voltage tolerance and stronger fault protection, while PI3CH400QE offers higher density and marginally faster switching but omits critical power-down safety features essential for modular industrial systems.
Availability
SN74CBT3384CDBR is available at Aetrix Electronics and suitable for PCI interface design, memory interleaving architectures, and industrial backplane isolation requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SN74CBT3384CDBR 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 heritage in high-reliability logic and interface solutions.
The SN74CBT3384CDBR belongs to TI's CBT (Crossbar Bus Transceiver) family, engineered specifically for ultra-low-latency, bidirectional bus switching in mixed-voltage computing and industrial control infrastructure.
FAQ
What is the maximum undershoot voltage the SN74CBT3384CDBR can withstand on its A and B ports?
The SN74CBT3384CDBR provides active undershoot protection up to −2 V on both A and B ports, verified per test conditions in the SCDS132A datasheet. This clamping function remains effective even when the device is unpowered, preventing false turn-on and ensuring reliable isolation during negative transients in noisy environments. The SN74CBT3384CDBR achieves this via integrated protection circuitry that monitors port voltage and maintains OFF-state integrity.
Does the SN74CBT3384CDBR support partial power-down operation, and how is it implemented?
Yes, the SN74CBT3384CDBR supports partial power-down via its Ioff feature, which limits leakage current to ≤10 µA when VCC = 0 V and I/O voltages range from 0 V to 5.5 V. This ensures no damaging backflow current occurs between powered and unpowered system domains. The SN74CBT3384CDBR maintains high-impedance isolation under these conditions, making it suitable for hot-swap and modular backplane applications where subsystems may be independently powered.
What is the typical ON-state resistance (ron) of the SN74CBT3384CDBR, and how does it affect signal integrity?
The SN74CBT3384CDBR has a typical ON-state resistance of 3 Ω at VCC = 4.5 V and IO = 30 mA, with a maximum of 6 Ω across operating conditions. This low ron minimizes voltage drop and power dissipation during signal transmission, preserving logic thresholds and reducing timing skew in high-speed buses. For example, at 64 mA drive current, the worst-case drop is <384 mV - well within margins for 5-V TTL and 3.3-V LVTTL signaling. The SN74CBT3384CDBR's symmetric FET architecture also ensures matched rise/fall characteristics.
Can the SN74CBT3384CDBR be used for analog signal switching, and what specifications support this use?
Yes, the SN74CBT3384CDBR is qualified for analog signal gating due to its bidirectional, low-ron FET structure, 5 pF OFF-state capacitance, and flat frequency response up to 100 MHz. Its rail-to-rail I/O voltage range (0–5.5 V), absence of CMOS charge injection, and matched A/B path impedance enable low-distortion transmission of analog waveforms such as sensor outputs or audio signals. The SN74CBT3384CDBR's undershoot protection further enhances reliability in mixed-signal environments subject to transient coupling.
What are the recommended operating conditions for VCC and ambient temperature for the SN74CBT3384CDBR?
The SN74CBT3384CDBR is specified for VCC between 4 V and 5.5 V, and ambient operating temperature from −40°C to +85°C - matching industrial-grade requirements. Operation outside this range risks exceeding absolute maximum ratings (e.g., VCC > 7 V or < −0.5 V) or degrading parametric performance such as propagation delay or ON-resistance. The SN74CBT3384CDBR's thermal resistance (θJA = 63°C/W in DB package) supports continuous operation at full load within this envelope when PCB layout follows TI's recommended copper pour guidelines.
SN74CBT3384CDBR 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:
- Obsolete
- 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
SN74CBT3384CDBR FAQ
1.How can I place an order for SN74CBT3384CDBR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CBT3384CDBR 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 SN74CBT3384CDBR reliable?
The price and inventory of SN74CBT3384CDBR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBT3384CDBR is usually 5 days.
3.What payment methods are accepted for SN74CBT3384CDBR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74CBT3384CDBR transactions.
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4.How is shipping managed for SN74CBT3384CDBR?
SN74CBT3384CDBR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74CBT3384CDBR 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 SN74CBT3384CDBR?
For technical support, including SN74CBT3384CDBR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBT3384CDBR requirements.
6.How does Aetrix verify that SN74CBT3384CDBR is sourced from the original manufacturer or authorized distributors?
All SN74CBT3384CDBR 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 SN74CBT3384CDBR meets industry standards.
7.What is the process for return or replacement of SN74CBT3384CDBR?
All SN74CBT3384CDBR units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBT3384CDBR, 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 SN74CBT3384CDBR part is unused and in its original packaging.
Return procedure for SN74CBT3384CDBR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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