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Texas Instruments SN74CB3Q16211GQLR
- Part No.:
- SN74CB3Q16211GQLR
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 56-VFBGA
- Datasheet:
-
SN74CB3Q16211GQLR.pdf
- Description:
- IC BUS SWITCH 12 X 1:1 56BGA
- Quantity:
- Payment:
- Shipping:
Inventory:3,589
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Product details
Overview
SN74CB3Q16211GQLR from Texas Instruments is a 24-bit FET bus switch organized as two independent 12-bit bidirectional switches, featuring 5-Ω typical ON-state resistance (ron), rail-to-rail switching (0 V to 5 V with 3.3-V VCC), and 500-MHz high-bandwidth data path capability - deployed in PCI interface and memory interleaving applications.
For engineers reviewing the SN74CB3Q16211GQLR datasheet, SN74CB3Q16211GQLR pinout, SN74CB3Q16211GQLR application, or SN74CB3Q16211GQLR equivalent, key selection criteria include partial-power-down support (Ioff), low 4-pF OFF-state I/O capacitance, 0.25-ns propagation delay, 2.3–3.6-V VCC operation, and GQL-packaged 56-pin VFBGA footprint compatibility.
Technical Context
The SN74CB3Q16211GQLR implements charge-pump-enhanced FET pass transistors to maintain flat ron across input voltage (0 V to 5 V) and supply (2.3 V to 3.6 V), enabling rail-to-rail signal integrity without level-shifting. Its dual 12-bit architecture supports independent enable control via 1OE and 2OE pins.
Each switch channel delivers near-zero propagation delay (0.25 ns max), bidirectional data flow, and Ioff protection that blocks backflow current during partial power-down - critical for hot-swap and mixed-voltage system interoperability where VCC may be unpowered while I/O remains active at up to 5.5 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.3 V to 3.6 V - ensures compatibility with 2.5-V and 3.3-V logic domains without external regulation |
| ron (Typ) | 5 Ω - minimizes voltage drop and distortion for high-speed digital/analog signals up to 500 MHz |
| Cio(OFF) | 4 pF typical - reduces capacitive loading on buses, preserving signal rise/fall times and timing margins |
| tpd (Max) | 0.25 ns - enables sub-nanosecond signal gating essential for DDR memory and PCIe Gen1 clock domains |
| Ioff | 1 µA at VCC = 0 V - prevents damaging current flow when device is powered down but I/O lines remain live at 0–5.5 V |
| fOE (Max) | 20 MHz - supports fast enable/disable cycling for dynamic bus isolation in packet-switched systems |
| VI/O Range | 0 V to 5.5 V - allows interfacing between 1.2-V, 1.5-V, 1.8-V, 2.5-V, 3.3-V, and 5-V logic families without level shifters |
Pinout & Package
GQL package is a 56-pin Very Thin Fine-Pitch Ball Grid Array (VFBGA) with 0.5-mm pitch, 7.0 mm × 4.5 mm body size, and 42°C/W thermal resistance - optimized for high-density PCB layouts requiring minimal board area and low thermal impedance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1A1–1A12, 2A1–2A12 | Input/Output Port A (Group 1 & 2) | Bidirectional data terminals for first and second 12-bit switch banks; tolerate 0–5.5 V regardless of VCC state |
| 1B1–1B12, 2B1–2B12 | Input/Output Port B (Group 1 & 2) | Corresponding bidirectional data terminals mirroring Port A; connected when OE is low |
| 1OE, 2OE | Output Enable (Active-Low) | Independent control inputs per 12-bit bank; must be pulled up to VCC for power-up high-impedance safety |
| VCC | Supply Voltage | Single 2.3–3.6-V supply powering internal charge pump and logic; powers Ioff circuitry |
| GND (×6 pins) | Ground Reference | Multiple dedicated ground balls reduce ground bounce and improve signal integrity in high-speed switching |
| NC (×2 pins) | No Internal Connection | Unbonded pads - must be left floating or grounded per PCB design rules; no electrical function |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail signal switching | Supports 0-V to 5-V analog/digital signals with 3.3-V VCC - eliminates need for external level translators in mixed-voltage buses |
| Charge-pump gate drive | Elevates FET gate voltage above VCC to sustain low, flat ron across full VI/O range - ensures consistent timing and amplitude response |
| Partial-power-down support (Ioff) | Blocks >99.9% of backflow current when VCC = 0 V and I/O = 5.5 V - enables safe hot-plug and power-gating in modular systems |
| Low OFF-state I/O capacitance | 4 pF typical isolates switched buses without degrading edge rates - critical for maintaining >500-MHz bandwidth in high-speed interconnects |
| Undershoot clamp diodes | Integrated clamps on all data and control inputs limit negative transients to −1.8 V - protects against ESD-induced latch-up in noisy environments |
Applications
| PCI Interface | Differential Signal Interface |
|---|---|
Use Scenario: Isolating legacy PCI slots from shared system address/data buses during configuration or fault conditions. IC Role / Device Role / Timing Role: Bidirectional 24-bit bus switch providing low-latency, low-distortion signal gating with no added propagation skew. Use Value: Enables hot-plug-safe PCI expansion while maintaining 33-MHz timing compliance and preventing bus contention. | Use Scenario: Routing LVDS or RSDS differential pairs through shared backplane traces without crosstalk or impedance discontinuity. IC Role / Device Role / Timing Role: Low-capacitance, matched-path FET switch preserving differential pair symmetry and common-mode rejection. Use Value: Delivers <4-pF channel capacitance and <0.05-Ω ron mismatch - minimizing jitter accumulation and eye closure in 650-Mbps links. |
| Memory Interleaving | Bus Isolation |
Use Scenario: Dynamically connecting alternate DRAM banks to a single memory controller to increase effective bandwidth. IC Role / Device Role / Timing Role: Dual 12-bit switch enabling time-multiplexed access between controller and two independent 64-bit memory channels. Use Value: Achieves sub-0.3-ns propagation delay and 5-Ω ron - ensuring setup/hold timing margins are preserved across 400-MT/s DDR interfaces. | Use Scenario: Electrically isolating test equipment I/O from production system buses during in-circuit validation. IC Role / Device Role / Timing Role: High-impedance break-before-make switch decoupling DUT from stimulus sources during reconfiguration. Use Value: Provides guaranteed high-Z state with <1-µA leakage and 5.5-V I/O tolerance - eliminating risk of signal injection or damage during probe transitions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBTLV3125PWR | Quad 2-bit switch; 3.3-V only; 6-Ω ron; 3.5-pF Cio(OFF); no Ioff; 14-pin TSSOP | Limited to 8-bit total width and lacks partial-power-down capability - unsuitable for hot-swap or mixed-voltage isolation | Select only for cost-sensitive, fixed 3.3-V systems requiring minimal channel count and no power sequencing constraints. |
| PI3CH406LE | Hex 2-bit switch; 2.5–5.5-V VCC; 8-Ω ron; 5.5-pF Cio(OFF); Ioff supported; 24-pin QFN | Higher ron and capacitance reduce bandwidth margin; smaller 24-pin footprint limits trace routing for 24-bit buses | Prefer when board space is constrained and 24-bit width is split across multiple devices - not for monolithic 24-bit switching. |
Compared with SN74CB3Q16211GQLR, SN74CBTLV3125PWR offers lower cost but sacrifices 24-bit integration, Ioff, and 5-V tolerance; PI3CH406LE provides wider VCC range but trades 30% higher ron and 38% higher Cio(OFF), limiting usable frequency to ~350 MHz in identical layouts.
Availability
SN74CB3Q16211GQLR is available at Aetrix Electronics and suitable for PCI interface, memory interleaving, differential signal routing, and bus isolation applications requiring stable component supply, long-term lifecycle assurance, and traceable sourcing for industrial and telecom infrastructure designs.
Supply support for SN74CB3Q16211GQLR 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 over 90 years of innovation in high-reliability, high-performance components.
The SN74CB3Q16211GQLR belongs to TI's Widebus™ family of high-bandwidth FET bus switches, engineered specifically for low-distortion, rail-to-rail signal routing in broadband communications, networking, and data-intensive computing systems.
FAQ
What is the maximum signal frequency supported by the SN74CB3Q16211GQLR?
The SN74CB3Q16211GQLR supports up to 500 MHz high-bandwidth data path operation, verified under load conditions matching typical PCB trace impedances and terminations. This performance derives from its 5-Ω typical ON-state resistance and 4-pF OFF-state I/O capacitance, which jointly preserve signal integrity and minimize RC-induced rise-time degradation. The 20-MHz maximum OE switching frequency further enables rapid bus reconfiguration without compromising timing margins in real-time systems.
Does the SN74CB3Q16211GQLR support partial-power-down mode?
Yes, the SN74CB3Q16211GQLR fully supports partial-power-down mode via its Ioff circuitry, which limits current backflow to 1 µA when VCC = 0 V and I/O voltages range from 0 V to 5.5 V. This feature is critical for hot-plug applications and mixed-voltage systems where subsystems power up/down asynchronously. The Ioff specification exceeds JESD 78 Class II latch-up immunity requirements, ensuring robust operation even during transient power states.
What is the recommended power-up sequence for the SN74CB3Q16211GQLR?
The SN74CB3Q16211GQLR requires OE pins to be held high (via pull-up resistor to VCC) during power-up to guarantee high-impedance state before VCC stabilizes. TI specifies a minimum pull-up resistor value based on driver sink capability - typically 10 kΩ for standard CMOS drivers. This prevents unintended bus connection during power ramp, avoiding contention or data corruption. VCC must reach 2.3 V before applying signals to I/O pins, and all unused control inputs must be tied to VCC or GND per SCBA004 guidelines.
Can the SN74CB3Q16211GQLR interface 1.8-V and 5-V logic domains simultaneously?
Yes, the SN74CB3Q16211GQLR supports 0-V to 5.5-V signaling on all data I/O ports regardless of VCC (2.3–3.6 V), enabling direct interfacing between 1.2-V, 1.5-V, 1.8-V, 2.5-V, 3.3-V, and 5-V logic families. Its rail-to-rail switching capability - demonstrated as 0-V to 5-V with 3.3-V VCC - eliminates level shifters in mixed-voltage buses. Control inputs accept TTL or 5-V/3.3-V CMOS levels, ensuring compatibility with legacy and modern controllers alike.
What package type is used for the SN74CB3Q16211GQLR?
The SN74CB3Q16211GQLR uses the GQL package: a 56-pin Very Thin Fine-Pitch Ball Grid Array (VFBGA) with 0.5-mm ball pitch, 7.0 mm × 4.5 mm body size, and 0.8-mm maximum height. This package delivers 42°C/W thermal resistance and supports high-density routing with short interconnects - ideal for compact, thermally demanding applications like telecom line cards and server memory modules. Pin assignments follow JEDEC MO-153 standards and match DL/DGG/DGV variants electrically.
SN74CB3Q16211GQLR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CB
- Package/Case:
- 56-VFBGA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Bus Switch
- Circuit:
- 12 x 1:1
- Independent Circuits:
- 2
- Current - Output High, Low:
- -
- Voltage Supply Source:
- Single Supply
- Voltage - Supply:
- 2.3V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 56-BGA Microstar Junior (7x4.5)
SN74CB3Q16211GQLR FAQ
1.How can I place an order for SN74CB3Q16211GQLR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CB3Q16211GQLR 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 SN74CB3Q16211GQLR reliable?
The price and inventory of SN74CB3Q16211GQLR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CB3Q16211GQLR is usually 5 days.
3.What payment methods are accepted for SN74CB3Q16211GQLR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74CB3Q16211GQLR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74CB3Q16211GQLR?
SN74CB3Q16211GQLR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74CB3Q16211GQLR 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 SN74CB3Q16211GQLR?
For technical support, including SN74CB3Q16211GQLR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CB3Q16211GQLR requirements.
6.How does Aetrix verify that SN74CB3Q16211GQLR is sourced from the original manufacturer or authorized distributors?
All SN74CB3Q16211GQLR 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 SN74CB3Q16211GQLR meets industry standards.
7.What is the process for return or replacement of SN74CB3Q16211GQLR?
All SN74CB3Q16211GQLR units undergo pre-shipment inspection (PSI). If there is an issue with SN74CB3Q16211GQLR, 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 SN74CB3Q16211GQLR part is unused and in its original packaging.
Return procedure for SN74CB3Q16211GQLR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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