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Texas Instruments SN74CB3Q16211DLR
- Part No.:
- SN74CB3Q16211DLR
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 56-BSSOP (0.295", 7.50mm Width)
- Datasheet:
-
SN74CB3Q16211DLR.pdf
- Description:
- IC BUS SWITCH 12 X 1:1 56SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,648
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Product details
Overview
SN74CB3Q16211DLR from Texas Instruments is a 24-bit, low-voltage FET bus switch optimized for high-bandwidth digital signal routing in mixed-voltage systems. It supports rail-to-rail switching (0 V to 5 V with 3.3-V VCC; 0 V to 3.3 V with 2.5-V VCC), features 5 Ω typical ON-state resistance, 4 pF typical OFF-state I/O capacitance, and operates across 2.3 V–3.6 V supply range. It serves as a bidirectional, low-distortion signal gate in PCIe interconnects, memory interleaving, and bus isolation.
For engineers reviewing the SN74CB3Q16211DLR datasheet, SN74CB3Q16211DLR pinout, SN74CB3Q16211DLR application, or SN74CB3Q16211DLR equivalent, this page delivers verified technical context, package-specific pin mapping, real-world use-value analysis, and two validated alternative parts - all grounded in TI's official SCDS167A specification and orderable addendum data.
Technical Context
The SN74CB3Q16211DLR implements a charge-pump-enhanced FET architecture to maintain flat, low ON-state resistance (5 Ω typ.) across its full 0–5 V I/O voltage range and operating temperature (–40°C to +85°C). Its dual 12-bit configuration enables independent control via 1OE and 2OE, supporting either two isolated 12-bit buses or one consolidated 24-bit path.
It integrates Ioff circuitry for partial-power-down operation, 5-V-tolerant I/Os regardless of VCC state, and undershoot clamp diodes on all data and control inputs. Propagation delay is near-zero (<0.25 ns), and switching frequency reaches 20 MHz maximum under 3.3-V conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.3 V to 3.6 V - Enables compatibility with 2.5-V and 3.3-V logic domains without level shifters. |
| ron (typ.) | 5 Ω - Ensures minimal insertion loss and signal integrity degradation in high-speed data paths up to 500 MHz. |
| Cio(OFF) (typ.) | 4 pF - Reduces capacitive loading on source and destination buses, preserving edge rates and timing margins. |
| Propagation Delay | 0.15–0.25 ns - Supports sub-nanosecond timing-critical applications such as DDR memory gating and PCIe Gen1/2 switching. |
| I/O Voltage Range | 0 V to 5.5 V - Allows seamless interfacing between 0.8-V, 1.2-V, 1.5-V, 1.8-V, 2.5-V, 3.3-V, and 5-V logic families. |
| Switching Frequency | 20 MHz max - Sustains reliable toggling at system clock edges without duty-cycle distortion or timing skew. |
| Operating Temperature | –40°C to +85°C - Qualified for industrial-grade embedded computing and consumer AV equipment environments. |
Pinout & Package
SN74CB3Q16211DLR is packaged in a 56-pin SSOP (DL) with 14.00 mm × 6.10 mm body size, 0.65 mm lead pitch, and surface-mount footprint compliant with JEDEC MO-153. Pin 1 is located at top-left corner (quadrant Q1), with leads arranged in two parallel rows.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1A1–1A12, 2A1–2A12 | Data input A-side terminals (24 total) | Source-side ports for first and second 12-bit switch banks; bidirectionally connected to B-side when OE active. |
| 1B1–1B12, 2B1–2B12 | Data output B-side terminals (24 total) | Sink-side ports; electrically mirrored to corresponding A pins during conduction; 5-V tolerant regardless of VCC. |
| 1OE, 2OE | Active-low enable inputs | Independently controls each 12-bit bank; low = ON (A↔B path closed); high = high-Z isolation; requires pull-up to VCC during power sequencing. |
| VCC | Positive supply | Single 2.3–3.6 V rail powers internal charge pump and logic; no separate analog/digital supplies required. |
| GND (pins 8, 17, 35, 44) | Ground reference | Four dedicated ground pins minimize ground bounce and improve noise immunity in high-speed switching. |
| NC (pin 1) | No internal connection | Unused pad; must remain unconnected per TI design guidance to avoid parasitic coupling or ESD path issues. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail I/O switching | Supports 0–5 V signaling with 3.3-V VCC and 0–3.3 V with 2.5-V VCC - eliminates need for external voltage translators in multi-supply systems. |
| Charge-pump gate drive | Elevates pass-FET gate voltage above VCC to sustain low, flat ron across full I/O voltage swing - critical for amplitude-consistent signal gating. |
| Ioff partial-power-down | Blocks reverse current flow when VCC = 0 V - protects powered-down sections from backfeeding in hot-swap or modular subsystem designs. |
| 5-V tolerant I/Os | Withstands 5-V signals on A/B pins even when unpowered - enables safe integration into legacy 5-V infrastructure without interface buffers. |
| Low dynamic power | ICC = 1 mA typical at 3.6 V; ICCD = 0.15–0.25 mA/MHz per control input - reduces thermal load in dense PCB layouts with multiple switches. |
Applications
| PCIe Interconnect Gating | Memory Interleaving Control |
|---|---|
|
Use Scenario: Isolating PCIe lanes between CPU and peripheral ASIC during firmware update or thermal throttling. IC Role / Device Role / Timing Role: Bidirectional, low-latency signal gate enabling dynamic lane disable without retraining overhead. Use Value: Preserves signal integrity (Cio(OFF) = 4 pF) and avoids timing skew (tpd < 0.25 ns), ensuring PCIe Gen2 link stability during reconfiguration. |
Use Scenario: Selecting between two DDR3 memory banks in embedded PC or DLP projector controller. IC Role / Device Role / Timing Role: High-bandwidth, rail-to-rail bus switch synchronizing address/data lines across voltage domains (1.5 V DDR3 ↔ 3.3 V controller). Use Value: 5-Ω ron minimizes propagation delay variation across 24-bit width, preventing setup/hold violations in 800 MT/s memory interfaces. |
| AV Receiver Signal Routing | Blu-ray Player HDMI Auxiliary Path |
|
Use Scenario: Switching SPDIF, I²S, or TDM audio streams between multiple DACs and DSP cores in home theater receivers. IC Role / Device Role / Timing Role: Low-distortion analog-capable digital switch handling jitter-sensitive serial audio clocks and data. Use Value: Flat ron and 500-MHz bandwidth preserve edge fidelity of 24.576-MHz audio master clocks, reducing phase noise in DAC reconstruction. |
Use Scenario: Enabling/disabling auxiliary HDMI CEC or DDC channels during disc insertion or format negotiation in Blu-ray players. IC Role / Device Role / Timing Role: 5-V tolerant, low-capacitance isolation switch for I²C-compatible control buses sharing 3.3-V system rails. Use Value: 5-V tolerance allows direct connection to HDMI source-side 5-V pull-ups; 4-pF Cio(OFF) prevents signal rise-time degradation on 100-kHz DDC bus. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar FET bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBT16211DGVR | Lower bandwidth (200 MHz max), higher ron (7 Ω typ.), no charge pump - uses standard NMOS pass gate. | Lacks rail-to-rail support below 3.3 V; unsuitable for 2.5-V domain or 0–5 V mixed signaling. | Select when cost sensitivity outweighs bandwidth and voltage flexibility; verify timing margins at target data rate. |
| SN74LVC1G3157DBVR | Single-channel SPDT, 5-V tolerant, ron = 6 Ω typ., but only 1-bit width and no 24-bit parallel capability. | Requires 24 discrete units to match SN74CB3Q16211DLR functionality - increases board area, layout complexity, and BOM count. | Use only for point-to-point signal routing where density and integration are secondary to ultra-low unit cost. |
Compared with SN74CB3Q16211DLR, SN74CBT16211DGVR trades bandwidth and voltage range for lower cost and simpler biasing, while SN74LVC1G3157DBVR offers per-pin flexibility at the expense of scalability - making SN74CB3Q16211DLR the optimal choice for integrated 24-bit, high-fidelity bus switching.
Availability
SN74CB3Q16211DLR is available at Aetrix Electronics and suitable for PCIe interconnect gating, memory interleaving control, and AV receiver signal routing requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for SN74CB3Q16211DLR 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 90 years of innovation in high-reliability IC design.
The SN74CB3Q16211DLR belongs to TI's Widebus® family of high-speed 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 bandwidth supported by the SN74CB3Q16211DLR?
The SN74CB3Q16211DLR supports up to 500 MHz signal bandwidth, as confirmed in TI's SCDS167A datasheet Section 1. This performance stems from its charge-pump-enhanced FET architecture, low 5-Ω ON-state resistance, and 4-pF OFF-state I/O capacitance - enabling clean transmission of fast-edged digital signals without significant attenuation or group delay.
Does the SN74CB3Q16211DLR require external level shifters when interfacing 1.8-V and 5-V logic?
No. The SN74CB3Q16211DLR supports 0-V to 5-V signaling on its data I/O ports with 2.5-V or 3.3-V VCC, eliminating external level shifters. Its 5-V-tolerant I/Os accept 5-V inputs even when unpowered, and rail-to-rail switching ensures full logic swing preservation - a key advantage documented in Section 1 and Table 5-1 of the SN74CB3Q16211DLR datasheet.
How does the Ioff feature protect systems during partial power-down?
The Ioff circuitry in the SN74CB3Q16211DLR actively blocks current backflow when VCC = 0 V, preventing damage to powered-down sections. As specified in Section 5, this enables safe hot-swap operation and modular subsystem isolation - critical in embedded PCs and AV receivers where subsystems power up/down independently.
What is the recommended pull-up resistor value for OE pins on the SN74CB3Q16211DLR?
Texas Instruments recommends tying OE pins to VCC through a pull-up resistor to ensure high-impedance state during power-up/power-down. The minimum resistor value depends on the driver's current-sinking capability; TI's datasheet Section 5 states it must be selected based on that driver's sink rating - no fixed value is prescribed, as it varies with system-level driver strength.
Is the SN74CB3Q16211DLR RoHS-compliant and suitable for industrial temperature operation?
Yes. The SN74CB3Q16211DLR is RoHS-compliant (per TI's PACKAGE OPTION ADDENDUM) and rated for –40°C to +85°C operation. Its qualification across this range - including latch-up performance >100 mA (JESD 78 Class II) and ESD robustness (2000-V HBM) - confirms suitability for industrial embedded and consumer AV applications per Sections 1, 7.3, and 7.4 of the official datasheet.
SN74CB3Q16211DLR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CB
- Package/Case:
- 56-BSSOP (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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-SSOP
SN74CB3Q16211DLR FAQ
1.How can I place an order for SN74CB3Q16211DLR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CB3Q16211DLR 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 SN74CB3Q16211DLR reliable?
The price and inventory of SN74CB3Q16211DLR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CB3Q16211DLR is usually 5 days.
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Once your SN74CB3Q16211DLR 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 SN74CB3Q16211DLR?
For technical support, including SN74CB3Q16211DLR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CB3Q16211DLR requirements.
6.How does Aetrix verify that SN74CB3Q16211DLR is sourced from the original manufacturer or authorized distributors?
All SN74CB3Q16211DLR 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 SN74CB3Q16211DLR meets industry standards.
7.What is the process for return or replacement of SN74CB3Q16211DLR?
All SN74CB3Q16211DLR units undergo pre-shipment inspection (PSI). If there is an issue with SN74CB3Q16211DLR, 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 SN74CB3Q16211DLR part is unused and in its original packaging.
Return procedure for SN74CB3Q16211DLR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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