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Texas Instruments SN74CBTD3384CDWR
- Part No.:
- SN74CBTD3384CDWR
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74CBTD3384CDWR.pdf
- Description:
- IC BUS SWITCH 5 X 1:1 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,117
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Product details
Overview
SN74CBTD3384CDWR from Texas Instruments is a 10-bit TTL-compatible FET bus switch IC with dual 5-bit configurable channels, 3 Ω typical ON-state resistance, bidirectional signal flow, and integrated 5-V-to-3.3-V level shifting. It operates from 4.5 V to 5.5 V and supports 0–5-V I/O signaling across mixed-voltage memory and bus isolation applications.
For engineers reviewing the SN74CBTD3384CDWR datasheet, SN74CBTD3384CDWR pinout, SN74CBTD3384CDWR application, or SN74CBTD3384CDWR equivalent, key selection criteria include undershoot protection to −2 V, partial-power-down Ioff support, low 5 pF OFF-state capacitance, and SOIC-24 package compatibility with industrial temperature range (−40°C to 85°C).
Technical Context
The SN74CBTD3384CDWR implements two independent 5-bit FET-based analog switches controlled by separate OE inputs (1OE, 2OE), enabling flexible 5-bit or consolidated 10-bit bus gating. Each switch channel features active undershoot-protection circuitry on both A and B ports, clamping transients down to −2 V while maintaining high-impedance isolation.
Its integrated series diode between VCC and the internal level-shifting path enables reliable 5-V input to 3.3-V output translation without external components. The device fully supports partial-power-down via Ioff, limiting backflow current to ≤10 µA when VCC = 0 V and I/O pins are biased up to 5.5 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - Ensures stable operation in standard 5-V logic systems with ±10% supply tolerance. |
| ron (Typ) | 3 Ω - Minimizes voltage drop and power loss during signal pass-through; critical for high-fidelity analog/digital bus switching. |
| Cio(OFF) (Typ) | 5 pF - Reduces capacitive loading on driven buses, preserving signal edge integrity and timing margins. |
| tpd (Max) | 0.15 ns - Near-zero propagation delay enables use in high-speed data paths without timing budget impact. |
| Undershoot Protection | −2 V on A/B ports - Prevents false turn-on and latch-up during negative transient events in hot-swap or noisy environments. |
| Ioff (Max) | 10 µA at VCC = 0 V - Enables safe isolation during system power sequencing and partial-power-down modes. |
| VI/O Range | 0 V to 5.5 V - Supports interoperability across 0.8-V to 5-V logic families without level-shifter overhead. |
Pinout & Package
SN74CBTD3384CDWR is housed in a 24-pin SOIC (DW) package measuring 15.4 mm × 7.5 mm × 2.35 mm (max height), with gull-wing leads, RoHS-compliant NiPdAu/Sn lead finish, and moisture sensitivity level (MSL) 1 (260°C peak reflow, unlimited floor life).
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE | Channel enable inputs | Active-low control: drives associated 5-bit switch ON (low) or into high-Z (high); supports independent bus gating. |
| 1A1–1A5, 2A1–2A5 | Input/output port A terminals | Bidirectional data path endpoints; tolerate 0–5.5 V signals regardless of VCC state. |
| 1B1–1B5, 2B1–2B5 | Input/output port B terminals | Paired with respective A pins; identical electrical behavior and undershoot protection. |
| GND | Ground reference | Primary return path for all internal circuitry and I/O clamp diodes. |
| VCC | Power supply | Supplies switch bias and powers internal level-shifting diode; must be 4.5–5.5 V for guaranteed operation. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 5-V-to-3.3-V level shifter | Eliminates need for external translation circuitry when interfacing 5-V controllers with 3.3-V peripherals. |
| Undershoot protection to −2 V | Prevents erroneous conduction and ensures robust OFF-state isolation during negative transients on A/B ports. |
| Partial-power-down Ioff support | Blocks damaging back-current flow when VCC is unpowered, enabling safe hot-plug and multi-rail sequencing. |
| Bidirectional, near-zero-delay switching | Enables transparent signal routing in either direction with <0.15 ns propagation delay-no added latency. |
| Low 5 pF OFF-state capacitance | Minimizes crosstalk and signal distortion in high-frequency or high-density bus architectures. |
Applications
| Memory Interleaving | Bus Isolation |
|---|---|
|
Use Scenario: Dynamically routing address/data lines between two DRAM banks operating at different voltage levels (e.g., 5-V controller ↔ 3.3-V SDRAM). IC Role / Device Role / Timing Role: Bidirectional level-translating bus switch enabling seamless bank selection without timing penalty. Use Value: Eliminates external level shifters and preserves nanosecond-scale timing alignment across interleaved memory access cycles. |
Use Scenario: Isolating PCI or ISA bus segments during firmware updates or fault containment in industrial controllers. IC Role / Device Role / Timing Role: High-Z gate controlled by system management logic to decouple bus sections on demand. Use Value: Prevents corruption of live bus traffic during maintenance; undershoot protection maintains isolation under ESD or load-dump events. |
| Low-Distortion Signal Gating | Hot-Swappable Module Interface |
|
Use Scenario: Enabling/disabling analog sensor signals (e.g., thermocouple or RTD front-ends) in precision measurement systems. IC Role / Device Role / Timing Role: Low-capacitance, low-ron analog switch preserving signal fidelity and DC accuracy. Use Value: Maintains <5 pF OFF-state loading and <3 Ω ON-resistance-critical for sub-mV resolution and minimal gain error. |
Use Scenario: Safely connecting peripheral modules (e.g., I/O expansion cards) to a powered-backplane without disrupting main system operation. IC Role / Device Role / Timing Role: Ioff-enabled isolation switch ensuring no backfeed during insertion/removal under power. Use Value: Guarantees ≤10 µA leakage at VCC = 0 V, meeting hot-swap safety requirements per IEC 61000-4-2 Level 4. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBT3384CDWR | No integrated level-shifting diode; requires external 3.3-V bias for 5-V-to-3.3-V translation. | Suitable only where external level-shifting infrastructure exists or is preferred for design flexibility. | Select SN74CBT3384CDWR if board layout already includes discrete level-shifters and lower cost is prioritized over integration. |
| SN74LVC1G3157DCKR | Single-channel SPDT switch; 5-V tolerant I/O but no built-in undershoot protection or Ioff spec. | Limited to point-to-point signal routing-not scalable to multi-bit bus isolation or memory interleaving. | Choose SN74LVC1G3157DCKR only for low-pin-count, non-critical signal gating where full 10-bit channel control is unnecessary. |
Compared with SN74CBTD3384CDWR, SN74CBT3384CDWR lacks integrated level shifting and requires external biasing, while SN74LVC1G3157DCKR offers only single-pole functionality and no undershoot hardening-making SN74CBTD3384CDWR uniquely suited for robust, integrated, multi-bit mixed-voltage bus management.
Availability
SN74CBTD3384CDWR is available at Aetrix Electronics and suitable for memory interleaving, bus isolation, and low-distortion signal gating requiring stable component supply across industrial temperature ranges and long-lifecycle production programs.
Supply support for SN74CBTD3384CDWR 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 reliability validation in industrial and automotive applications.
The SN74CBTD3384CDWR belongs to TI's CBTD-series high-speed bus switches, designed specifically for low-latency, mixed-voltage digital interconnect in memory subsystems and modular computing platforms.
FAQ
What is the maximum undershoot voltage the SN74CBTD3384CDWR can withstand on its A and B ports?
The SN74CBTD3384CDWR provides active undershoot protection rated to −2 V on both A and B ports. This is achieved via internal sensing circuitry that forces the switch into a guaranteed OFF state during negative transients, preventing unintended conduction and ensuring isolation integrity even under harsh ESD or load-dump conditions.
Does the SN74CBTD3384CDWR support true bidirectional signal flow without direction control pins?
Yes, the SN74CBTD3384CDWR supports fully bidirectional signal flow between A and B ports with no direction control required. When enabled (OE low), the FET switch conducts identically in either direction-enabling transparent routing of clock, data, or analog signals regardless of source/sink orientation.
Can the SN74CBTD3384CDWR operate safely when VCC is powered down while I/O pins remain active?
Yes, the SN74CBTD3384CDWR includes Ioff circuitry that limits reverse current to ≤10 µA when VCC = 0 V and I/O pins are biased up to 5.5 V. This allows safe partial-power-down operation, such as hot-swapping modules or powering down subsystems while maintaining signal integrity on shared buses.
What is the typical ON-state resistance of the SN74CBTD3384CDWR and how does it affect signal integrity?
The SN74CBTD3384CDWR has a typical ON-state resistance (ron) of 3 Ω at VCC = 4.5 V. This low ron minimizes voltage drop and power dissipation across the switch, preserving signal amplitude and reducing jitter-especially critical in high-speed data buses and precision analog signal paths where even millivolt-level losses degrade performance.
Which package type and thermal characteristics apply to the SN74CBTD3384CDWR?
The SN74CBTD3384CDWR uses the SOIC-24 (DW) package with θJA = 46°C/W. Its 15.4 mm × 7.5 mm footprint and gull-wing leads support standard reflow profiles (MSL 1, 260°C peak), and the low thermal resistance enables reliable operation up to 85°C ambient without derating in typical PCB layouts with moderate copper pour.
SN74CBTD3384CDWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CBTD
- Package/Case:
- 24-SOIC (0.295", 7.50mm 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-SOIC
SN74CBTD3384CDWR FAQ
1.How can I place an order for SN74CBTD3384CDWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CBTD3384CDWR 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 SN74CBTD3384CDWR reliable?
The price and inventory of SN74CBTD3384CDWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBTD3384CDWR is usually 5 days.
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Once your SN74CBTD3384CDWR 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 SN74CBTD3384CDWR?
For technical support, including SN74CBTD3384CDWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBTD3384CDWR requirements.
6.How does Aetrix verify that SN74CBTD3384CDWR is sourced from the original manufacturer or authorized distributors?
All SN74CBTD3384CDWR 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 SN74CBTD3384CDWR meets industry standards.
7.What is the process for return or replacement of SN74CBTD3384CDWR?
All SN74CBTD3384CDWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBTD3384CDWR, 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 SN74CBTD3384CDWR part is unused and in its original packaging.
Return procedure for SN74CBTD3384CDWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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