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Texas Instruments SN74CB3Q16211ZQLR
- Part No.:
- SN74CB3Q16211ZQLR
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 56-VFBGA
- Datasheet:
-
SN74CB3Q16211ZQLR.pdf
- Description:
- IC BUS SWITCH 12 X 1:1 56BGA
- Quantity:
- Payment:
- Shipping:
Inventory:1,916
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Product details
Overview
SN74CB3Q16211ZQLR from Texas Instruments is a 24-bit FET bus switch IC with dual 12-bit configurable channels, 5-Ω typical ON-state resistance (ron), rail-to-rail 0-V to 5-V switching capability at 3.3-V VCC, and 500-MHz high-bandwidth data path-used for PCI interface isolation and memory interleaving in high-speed digital systems.
For engineers reviewing the SN74CB3Q16211ZQLR datasheet, SN74CB3Q16211ZQLR pinout, SN74CB3Q16211ZQLR application, or SN74CB3Q16211ZQLR equivalent, key selection criteria include partial-power-down support (Ioff), 4-pF typical OFF-state I/O capacitance, bidirectional zero-delay signal gating, and compatibility with 0.8-V to 5-V signaling levels across mixed-voltage domains.
Technical Context
The SN74CB3Q16211ZQLR implements two independent 12-bit FET bus switches with charge-pump-enhanced gate drive to maintain flat ron over voltage and temperature. Each channel features separate OE control (1OE/2OE), enabling independent enable/disable of A↔B bidirectional paths without propagation delay.
It supports true rail-to-rail switching: 0-V to 5-V data I/Os operate with 3.3-V VCC, while 0-V to 3.3-V operation is supported at 2.5-V VCC. The integrated undershoot clamp diodes on data and control inputs protect against negative transients, and Ioff circuitry blocks backflow current during partial power-down.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.3 V to 3.6 V - Enables operation in 2.5-V and 3.3-V logic domains with margin for supply variation. |
| ron (Typical) | 5 Ω - Ensures minimal insertion loss and signal integrity for high-frequency digital signals up to 500 MHz. |
| Cio(OFF) | 4 pF typical - Reduces capacitive loading on buses, preserving edge rate and minimizing crosstalk in dense PCB layouts. |
| Switching Frequency (fOE) | 20 MHz max - Supports fast enable/disable cycling for dynamic bus partitioning in real-time systems. |
| VI/O Range | 0 V to 5.5 V - Allows interoperability between 0.8-V, 1.2-V, 1.5-V, 1.8-V, 2.5-V, 3.3-V, and 5-V logic families without level shifters. |
| Ioff Current | 1 µA max at VCC = 0 V - Prevents damaging back-current flow when the device is powered down while system I/O remains active. |
| Propagation Delay (tpd) | 0.15 ns typical - Delivers near-zero latency for time-critical signal routing in test equipment and FPGA interconnects. |
Pinout & Package
The SN74CB3Q16211ZQLR is packaged in a 56-pin VFBGA (GQL) with 0.5-mm pitch, 7.0 mm × 4.5 mm body size, and bottom-solder ball array optimized for high-density routing and thermal dissipation (θJA = 42°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1A1–1A12, 2A1–2A12 | Channel A input/output ports | First and second 12-bit data buses; bidirectional, rail-to-rail compatible with 0-V to 5-V signals. |
| 1B1–1B12, 2B1–2B12 | Channel B input/output ports | Corresponding 12-bit output buses; electrically identical to A-side, enabling full duplex data flow. |
| 1OE, 2OE | Independent channel enable inputs | Active-low controls; each enables/disables its associated 12-bit switch independently for flexible bus segmentation. |
| VCC | Power supply | Supplies internal charge pump and logic; must be 2.3–3.6 V; powers clamping diodes and Ioff protection circuitry. |
| GND (Pins 8, 19, 35, 47) | Ground reference | Four dedicated ground pins minimize ground bounce and ensure stable ron and timing across all 24 channels. |
| NC (Pins 1, 56) | No internal connection | Unbonded pads; must remain unconnected to avoid mechanical stress or unintended coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail switching | Supports 0-V to 5-V signal translation at 3.3-V VCC-eliminates need for external level shifters in mixed-voltage memory subsystems. |
| Charge-pump gate drive | Maintains flat 5-Ω ron across full VI/O range and temperature-ensures consistent signal amplitude and timing skew across all 24 bits. |
| Undershoot clamp diodes | Integrated protection on all data and control I/Os-prevents latch-up and damage from −0.5-V transients without external components. |
| Partial-power-down (Ioff) | 1-µA max leakage when VCC = 0 V-enables safe hot-insertion and dynamic power gating in modular backplane architectures. |
| Low Cio(OFF) | 4-pF typical OFF-state capacitance-reduces stub effects and maintains signal integrity on high-speed parallel buses like DDR address/control lines. |
Applications
| PCI Interface Isolation | Differential Signal Interface |
|---|---|
Use Scenario: Isolating legacy PCI slots from modern host controllers to prevent signal contention during hot-plug events. IC Role / Device Role / Timing Role: Bidirectional 24-bit bus switch providing zero-delay, low-capacitance signal pass-through with independent OE control per 12-bit segment. Use Value: Enables clean break-before-make switching with <0.25 ns propagation delay and 4-pF OFF-state loading-preserving PCI timing budgets and signal rise/fall rates. | Use Scenario: Routing LVDS or RSDS differential pairs through shared backplane traces while maintaining common-mode integrity. IC Role / Device Role / Timing Role: Low-ron, low-Cio FET switch used in single-ended mode to gate one leg of differential pairs without skew or impedance discontinuity. Use Value: 5-Ω ron and matched trace routing minimize differential skew (<0.05 ns), while 4-pF Cio(OFF) prevents stub-induced jitter on 300-Mbps links. |
| Memory Interleaving | Bus Isolation |
Use Scenario: Dynamically connecting alternate DRAM banks to a shared controller bus to increase effective bandwidth in embedded SoC designs. IC Role / Device Role / Timing Role: Dual 12-bit switch acting as a reconfigurable 24-bit data path, controlled by bank-select logic to route DQ/DQS between banks and controller. Use Value: Rail-to-rail 0-V to 3.3-V operation at 2.5-V VCC matches DDR2 I/O voltage, and 500-MHz bandwidth supports >400 MT/s transfer rates. | Use Scenario: Electrically isolating processor debug interfaces (e.g., JTAG, SWD) from noisy system buses during firmware validation. IC Role / Device Role / Timing Role: High-impedance isolation gate activated only during debug sessions, preventing signal corruption on shared TCK/TMS lines. Use Value: 1-µA Ioff and 4-pF Cio(OFF) ensure no DC loading or AC coupling into debug lines-maintaining signal fidelity and IEEE 1149.1 compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBT16211DGVR | Lower bandwidth (200 MHz), higher ron (7 Ω), no charge pump-requires higher VCC for rail-to-rail operation. | Suitable for cost-sensitive 100-MHz PCI-X or legacy memory expansion where 500-MHz headroom is unnecessary. | Select when system clock rates stay below 200 MHz and power efficiency is prioritized over signal fidelity. |
| SN74LVC1G3157DCKR | Single-channel SPDT, 3.6-V max VCC, 6-Ω ron, no Ioff-lacks multi-bit coordination and partial-power-down capability. | Applicable only for point-to-point signal routing (e.g., ADC input multiplexing), not parallel bus applications. | Choose only for low-pin-count, single-signal gating where 24-bit concurrency and hot-swap safety are irrelevant. |
Compared with SN74CBT16211DGVR and SN74LVC1G3157DCKR, the SN74CB3Q16211ZQLR uniquely delivers 500-MHz bandwidth, 5-Ω ron with charge-pump stabilization, and robust Ioff-enabled partial-power-down-making it the sole option for high-speed, hot-pluggable, multi-bit bus isolation in telecom and test equipment.
Availability
SN74CB3Q16211ZQLR is available at Aetrix Electronics and suitable for PCI interface isolation, memory interleaving, differential signal routing, and bus isolation requiring stable component supply, long-term lifecycle assurance, and traceable sourcing for industrial and telecom infrastructure.
Supply support for SN74CB3Q16211ZQLR 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 delivering analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.
The SN74CB3Q16211ZQLR belongs to TI's Widebus™ family of high-bandwidth FET bus switches, designed specifically for low-distortion, zero-delay signal gating in broadband networking, high-speed computing, and mixed-voltage system interconnects.
FAQ
What is the maximum operating frequency supported by the SN74CB3Q16211ZQLR?
The SN74CB3Q16211ZQLR supports a high-bandwidth data path up to 500 MHz, as confirmed in the device's datasheet (SCDS167). This performance is enabled by its low 5-Ω typical ON-state resistance and 4-pF OFF-state I/O capacitance, which jointly preserve signal integrity at multi-hundred-MHz edge rates. The 20-MHz maximum OE switching frequency applies only to enable/disable control transitions-not data throughput.
Does the SN74CB3Q16211ZQLR support partial-power-down operation?
Yes, the SN74CB3Q16211ZQLR fully supports partial-power-down via its Ioff circuitry. When VCC = 0 V, Ioff limits current backflow to ≤1 µA even with 0-V to 5.5-V signals present on I/O pins. This feature protects downstream circuitry during hot-swap or power sequencing events and is validated per JESD 78 Class II latch-up standards.
What logic families can directly drive the control inputs of the SN74CB3Q16211ZQLR?
The control inputs (1OE, 2OE) of the SN74CB3Q16211ZQLR accept TTL and 5-V/3.3-V CMOS outputs. With VCC = 2.3–3.6 V, VIH thresholds range from 1.7 V to 2.0 V and VIL from 0 V to 0.8 V-ensuring reliable recognition of standard LVTTL, LVCMOS, and 5-V CMOS logic levels without external biasing or level translation.
Can the SN74CB3Q16211ZQLR be used for analog signal switching?
Yes, the SN74CB3Q16211ZQLR is explicitly qualified for both digital and analog applications per its datasheet. Its rail-to-rail 0-V to 5-V switching range, flat 5-Ω ron, and low 4-pF OFF-state capacitance make it suitable for low-distortion analog gating-such as routing audio line-level signals or sensor outputs-provided signal swing remains within the VI/O rating (−0.5 V to 7 V).
What package type is used for the SN74CB3Q16211ZQLR?
The SN74CB3Q16211ZQLR uses a 56-pin Very Thin Fine-Pitch Ball Grid Array (VFBGA) package designated GQL, with 0.5-mm ball pitch, 7.0 mm × 4.5 mm footprint, and JEDEC MO-153 compliance. This package provides superior thermal performance (θJA = 42°C/W) and high I/O density ideal for space-constrained telecom and test equipment PCBs.
SN74CB3Q16211ZQLR 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)
SN74CB3Q16211ZQLR FAQ
1.How can I place an order for SN74CB3Q16211ZQLR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CB3Q16211ZQLR 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 SN74CB3Q16211ZQLR reliable?
The price and inventory of SN74CB3Q16211ZQLR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CB3Q16211ZQLR is usually 5 days.
3.What payment methods are accepted for SN74CB3Q16211ZQLR?
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4.How is shipping managed for SN74CB3Q16211ZQLR?
SN74CB3Q16211ZQLR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74CB3Q16211ZQLR 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 SN74CB3Q16211ZQLR?
For technical support, including SN74CB3Q16211ZQLR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CB3Q16211ZQLR requirements.
6.How does Aetrix verify that SN74CB3Q16211ZQLR is sourced from the original manufacturer or authorized distributors?
All SN74CB3Q16211ZQLR 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 SN74CB3Q16211ZQLR meets industry standards.
7.What is the process for return or replacement of SN74CB3Q16211ZQLR?
All SN74CB3Q16211ZQLR units undergo pre-shipment inspection (PSI). If there is an issue with SN74CB3Q16211ZQLR, 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 SN74CB3Q16211ZQLR part is unused and in its original packaging.
Return procedure for SN74CB3Q16211ZQLR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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