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Texas Instruments SN74CBTS3384DBQR
- Part No.:
- SN74CBTS3384DBQR
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 24-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
SN74CBTS3384DBQR.pdf
- Description:
- IC BUS SWITCH 5 X 1:1 24SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,900
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Product details
Overview
SN74CBTS3384DBQR from Texas Instruments is a 10-bit FET bus switch with Schottky diode clamping, designed for high-speed TTL-compatible signal routing in backplane and board-level interconnects. It features dual 5-bit switches, 5-Ω on-state resistance, <0.35 ns propagation delay at 4 V, and operates from –40°C to 85°C with 4–5.5 V supply. Used in hot-swap-capable data paths where low capacitance and undershoot protection are critical.
For engineers reviewing the SN74CBTS3384DBQR datasheet, SN74CBTS3384DBQR pinout, SN74CBTS3384DBQR application, or SN74CBTS3384DBQR equivalent, key selection criteria include on-resistance matching, I/O clamp voltage (–0.6 V), control-input leakage (<1 µA), channel current rating (128 mA), and TSSOP-24 thermal performance (θJA = 88°C/W).
Technical Context
This device implements two independent 5-bit FET-based analog switches controlled by active-low OE inputs. Each switch path supports bidirectional signal flow between A and B ports with no internal logic inversion or level translation - only passive MOSFET conduction with integrated Schottky clamps for undershoot suppression.
It operates as a voltage-controlled transmission gate: when OE is low, the channel turns on with ron = 5–7 Ω (typical); when OE is high, the switch presents >10⁹ Ω isolation. Input capacitance is 6 pF per control pin, and off-state I/O capacitance is 6.5 pF - enabling clean high-frequency switching up to ~1 GHz small-signal bandwidth.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| On-state resistance (ron) | 5–7 Ω at VCC = 4.5 V, ensuring minimal voltage drop and signal attenuation in 50-Ω systems. |
| Propagation delay (tpd) | 0.35 ns max at VCC = 4 V, CL = 50 pF - supports sub-nanosecond timing-critical interconnects. |
| I/O clamp voltage (VIK) | –0.6 V at II = 18 mA - actively limits negative undershoot to protect downstream CMOS inputs. |
| Supply voltage range | 4–5.5 V - compatible with 5-V TTL and mixed-voltage 4.5-V logic domains without level shifters. |
| Control input leakage (IIL/IIH) | ±1 µA max - enables direct connection to microcontroller GPIOs without pull-up/down burden. |
| Channel current rating | 128 mA continuous - sufficient for driving multiple CMOS loads or short PCB traces. |
| Off-state I/O capacitance | 6.5 pF - minimizes capacitive loading on buses during disable, preserving signal integrity. |
Pinout & Package
SN74CBTS3384DBQR is housed in a 24-pin TSSOP (PW) package, 7.8 mm × 4.4 mm × 1.2 mm, with 0.65 mm pitch and exposed pad not electrically connected. Pin 1 is located at top-left corner with index marking.
| 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; high-impedance isolation when high. |
| 2OE | Output-enable for second 5-bit switch (2A1–2A5 ↔ 2B1–2B5) | Independent enable allows asynchronous gating of two data lanes without shared timing constraints. |
| 1A1–1A5, 2A1–2A5 | Port A inputs/outputs (first and second 5-bit banks) | Bidirectional terminals - no direction pin; signal flow determined by external system topology. |
| 1B1–1B5, 2B1–2B5 | Port B inputs/outputs (first and second 5-bit banks) | Electrically identical to Port A; Schottky clamps present on all A/B pins for bidirectional protection. |
| VCC | Positive supply | Must be decoupled locally; powers internal FET gates and clamp diodes - no internal regulation. |
| GND | Ground reference | Common return for all signals and supply; recommended to tie to solid ground plane under exposed pad area. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent 5-bit bus switches | Enables separate enable control of two data groups - e.g., address vs. data lines - reducing timing skew across subsystems. |
| Integrated Schottky clamping diodes | Clamps I/O undershoot to –0.6 V, eliminating need for external TVS or diode networks in hot-swap or cable-disconnect scenarios. |
| Low 5–7 Ω on-state resistance | Maintains signal fidelity in impedance-matched paths; reduces insertion loss below 0.1 dB at 100 MHz for 50-Ω traces. |
| 6.5 pF off-state I/O capacitance | Minimizes crosstalk and reflections when disabled - critical for multi-drop bus architectures with stub-sensitive layouts. |
| TTL-compatible control inputs | Accepts standard 0.8 V / 2.0 V logic thresholds - interoperable with legacy 5-V microcontrollers and FPGAs without level-shifting. |
Applications
| Hot-Swap Backplane Interface | Memory Subsystem Isolation |
|---|---|
|
Use Scenario: Inserting/removing line cards in telecom chassis while main backplane remains powered. IC Role / Device Role / Timing Role: Bidirectional signal gate between card-edge connector and backplane bus, enabled only after power sequencing completes. Use Value: Schottky clamps suppress connector bounce-induced undershoot; low ron prevents timing skew across 10-bit address/data lanes. |
Use Scenario: Isolating DDR SDRAM banks during partial memory refresh or power-down sequences. IC Role / Device Role / Timing Role: Physical layer switch disconnecting memory controller from inactive DRAM modules. Use Value: 6.5 pF off-capacitance avoids signal reflection on unterminated stubs; fast enable/disable (<6 ns) aligns with JEDEC tMOD windows. |
| PCI/PCI-X Slot Multiplexing | Test Access Port (TAP) Signal Routing |
|
Use Scenario: Sharing a single JTAG debug interface among multiple FPGA devices on a board via manual or firmware-selectable routing. IC Role / Device Role / Timing Role: Low-latency, bidirectional pass-through for TCK/TMS/TDI/TDO signals with no added jitter. Use Value: Sub-0.4 ns tpd preserves setup/hold margins at 25 MHz JTAG clock; 128 mA drive supports long trace runs. |
Use Scenario: Dynamically reconfiguring PCI/PCI-X slot assignments in server motherboards using BIOS-controlled switching. IC Role / Device Role / Timing Role: High-fidelity analog switch for AD[31:0], C/BE[3:0]#, and PAR signals between root complex and slot connectors. Use Value: Dual OE control allows staggered enable of address vs. command lanes; 5 Ω ron meets PCI-X DC specs for VOL/VOL mismatch. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar FET bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBT3384DBQR | Omits "S" in part number; older revision without Schottky clamps - VIK = –1.2 V, higher undershoot risk. | Not suitable for hot-swap or noisy connector environments requiring robust undershoot suppression. | Select SN74CBTS3384DBQR when I/O clamping to –0.6 V is required for system-level ESD/connector transient immunity. |
| 74LVC1G3157GW,125 | Single-pole double-throw (SPDT) switch, 5-V tolerant, ron = 10 Ω, no integrated clamps, 1-channel only. | Requires five units to match 10-bit functionality; lacks bank-level OE control and undershoot protection. | Consider only for low-pin-count prototyping or space-constrained designs where full 10-bit integration is unnecessary. |
Compared with SN74CBT3384DBQR and 74LVC1G3157GW,125, the SN74CBTS3384DBQR uniquely delivers dual-bank 5-bit switching with factory-integrated Schottky clamps, enabling single-chip hot-swap compliance and sub-0.4 ns propagation in compact TSSOP-24 - critical for backplane and memory isolation where timing and signal integrity co-constrain layout.
Availability
SN74CBTS3384DBQR is available at Aetrix Electronics and suitable for hot-swap backplane interfaces, memory subsystem isolation, PCI slot multiplexing, and JTAG signal routing requiring stable component supply across industrial and telecom equipment lifecycles.
Supply support for SN74CBTS3384DBQR 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 company headquartered in Dallas, Texas, delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and communications markets.
The SN74CBTS3384 belongs to TI's CBTS (Crosspoint Bus Switch) family, engineered specifically for high-speed, low-distortion signal routing in 5-V TTL and mixed-voltage digital systems with stringent undershoot and timing requirements.
FAQ
What is the maximum operating temperature range for SN74CBTS3384DBQR?
The SN74CBTS3384DBQR is rated for operation from –40°C to +85°C ambient temperature. This range is validated per TI's recommended operating conditions and supported by thermal characterization (θJA = 88°C/W for TSSOP-24). Derating is required above 70°C ambient if power dissipation exceeds 120 mW - typical under worst-case 128 mA channel current and 7 Ω ron.
Does SN74CBTS3384DBQR support bidirectional signal flow?
Yes, SN74CBTS3384DBQR supports fully bidirectional analog signal routing between Port A and Port B terminals. There is no internal direction control - signal direction is determined solely by external source/sink configuration. The FET switch architecture ensures symmetrical ron, capacitance, and clamp behavior on both sides, making it ideal for data/address bus applications.
Can SN74CBTS3384DBQR be used with 3.3-V logic systems?
SN74CBTS3384DBQR requires a 4–5.5 V VCC supply and is not 3.3-V compatible. Its control inputs are TTL-level (VIL ≤ 0.8 V, VIH ≥ 2.0 V), but the internal FET threshold and clamp diode forward voltage assume ≥4 V operation. For 3.3-V systems, TI recommends SN74CB3Q3245 or SN74LVC1G3157 - not SN74CBTS3384DBQR.
What is the purpose of the Schottky diodes in SN74CBTS3384DBQR?
The Schottky diodes in SN74CBTS3384DBQR clamp negative voltage excursions on all I/O pins (A and B ports) to –0.6 V at 18 mA, preventing undershoot from damaging downstream CMOS inputs during hot-plug events, cable disconnects, or inductive load switching. This eliminates the need for discrete clamping components in ruggedized interconnect designs.
Is SN74CBTS3384DBQR pin-compatible with other packages in the same family?
Yes - SN74CBTS3384DBQR (TSSOP-24), SN74CBTS3384DWR (SOIC-24), and SN74CBTS3384DBR (SSOP-24) share identical pinout and electrical specifications. Mechanical dimensions differ, but PCB footprint and signal routing are interchangeable across these packages. The DBQ variant (QSOP-24) also matches pin-for-pin despite minor package height variation.
SN74CBTS3384DBQR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CBTS
- Package/Case:
- 24-SSOP (0.154", 3.90mm 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
SN74CBTS3384DBQR FAQ
1.How can I place an order for SN74CBTS3384DBQR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CBTS3384DBQR 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 SN74CBTS3384DBQR reliable?
The price and inventory of SN74CBTS3384DBQR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBTS3384DBQR is usually 5 days.
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Once your SN74CBTS3384DBQR 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 SN74CBTS3384DBQR?
For technical support, including SN74CBTS3384DBQR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBTS3384DBQR requirements.
6.How does Aetrix verify that SN74CBTS3384DBQR is sourced from the original manufacturer or authorized distributors?
All SN74CBTS3384DBQR 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 SN74CBTS3384DBQR meets industry standards.
7.What is the process for return or replacement of SN74CBTS3384DBQR?
All SN74CBTS3384DBQR units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBTS3384DBQR, 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 SN74CBTS3384DBQR part is unused and in its original packaging.
Return procedure for SN74CBTS3384DBQR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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