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Texas Instruments SN74CB3T16211GQLR
- Part No.:
- SN74CB3T16211GQLR
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 56-VFBGA
- Datasheet:
-
SN74CB3T16211GQLR.pdf
- Description:
- IC BUS SWITCH 12 X 1:1 56BGA
- Quantity:
- Payment:
- Shipping:
Inventory:4,370
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Product details
Overview
SN74CB3T16211 from Texas Instruments is a 24-bit FET bus switch IC supporting bidirectional level translation between 0–5 V signaling domains, with 5-V-tolerant I/Os, 5 Ω typical ON-state resistance, and 0.15 ns propagation delay at 3.3 V - used for PCI interface isolation and mixed-voltage bus bridging in industrial control backplanes.
For engineers reviewing the SN74CB3T16211 datasheet, SN74CB3T16211 pinout, SN74CB3T16211 application, or SN74CB3T16211 equivalent, key selection criteria include VCC range (2.3–3.6 V), Ioff partial-power-down support, 5-pF OFF-state capacitance, and dual 12-bit independent enable control for flexible bus segmentation.
Technical Context
The SN74CB3T16211 implements two independent 12-bit FET-based analog switches controlled by 1OE and 2OE, each enabling bidirectional signal flow between A- and B-side ports with near-zero propagation delay. Its gate drive architecture tracks VCC to deliver output voltage translation matching the supply rail.
Each switch supports 5-V-tolerant I/Os regardless of VCC state (powered up/down), features undershoot clamp diodes on all data/control pins, and maintains high-impedance isolation during power transitions via Ioff protection that limits backflow current to ≤10 μA when VCC = 0 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.3 V to 3.6 V - enables operation across 2.5-V and 3.3-V system rails without external level shifters. |
| ron (Typ) | 5 Ω - minimizes voltage drop and signal distortion under 24-mA load, critical for integrity in high-speed digital buses. |
| tpd (Max) | 0.25 ns at 3.3 V - ensures sub-nanosecond timing alignment for PCI and memory interface applications. |
| Cio(OFF) (Typ) | 5 pF - reduces capacitive loading on driven nets, preserving signal edge rates in dense PCB layouts. |
| Ioff (Max) | 10 μA at VCC = 0 V - guarantees safe hot-insertion and partial-power-down behavior in modular systems. |
| VI/O Range | 0 V to 5.5 V - allows direct interfacing with 5-V TTL, 3.3-V LVTTL, and 2.5-V CMOS logic families. |
| ICC (Max) | 70 μA - supports ultra-low static power in battery-powered portable instrumentation and sensor hubs. |
Pinout & Package
VFBGA package (GQL, 56-pin, 3.5 mm × 4.5 mm, 0.5-mm pitch) with exposed thermal pad; RoHS-compliant, Pb-free finish; MSL Level-1 rated.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1A1–1A12, 2A1–2A12 | Data input/output (A-side) | First/second 12-bit port group; bidirectional, 5-V tolerant, connected to B-side when OE low. |
| 1B1–1B12, 2B1–2B12 | Data input/output (B-side) | Corresponding B-side terminals; electrically mirrored to A-side with no directionality constraint. |
| 1OE, 2OE | Output-enable control | Active-low enables respective 12-bit switch; must be pulled up to VCC for power-up high-Z safety. |
| VCC | Supply voltage | Primary power rail (2.3–3.6 V); sets output translation level and internal gate bias for FET switches. |
| GND (×4) | Ground reference | Dedicated ground connections per quadrant reduce switching noise coupling and improve return path integrity. |
| NC | No internal connection | Unbonded pads (pins 1 and 56); omitted from routing and thermal pad design. |
Key Features
| Feature | Design Value |
|---|---|
| Output voltage translation | Tracks VCC precisely - enables seamless 5-V-to-3.3-V or 5-V-to-2.5-V down-translation without external resistors. |
| Mixed-mode signal operation | Simultaneous 5-V, 3.3-V, and 2.5-V I/O on same device - eliminates need for discrete translators in multi-rail systems. |
| 5-V tolerant I/Os | Operates safely with 5-V signals while powered at 2.5 V or 3.3 V - protects downstream logic during voltage domain crossing. |
| Bidirectional zero-delay switching | No clock or direction pin required - simplifies PCB layout and firmware control for dynamic bus reconfiguration. |
| Ioff partial-power-down support | Prevents back-current flow when VCC = 0 V - essential for hot-swap compliance and modular backplane designs. |
Applications
| PCI Bus Isolation | Multi-Rail Memory Interface |
|---|---|
Use Scenario: Segregating legacy 5-V PCI add-in cards from modern 3.3-V host controllers in industrial PC chassis. IC Role / Device Role / Timing Role: Bidirectional bus switch isolating address/data lines while translating 5-V PCI signals to 3.3-V host logic levels. Use Value: Eliminates need for discrete level translators and reduces signal skew with 0.25-ns max tpd, maintaining PCI timing margins. |
Use Scenario: Interfacing DDR2 SDRAM (2.5-V I/O) with a 3.3-V FPGA memory controller in test equipment. IC Role / Device Role / Timing Role: Voltage-translating bus switch enabling clean 2.5-V ↔ 3.3-V bidirectional data transfer on DQ/DQS lines. Use Value: Maintains signal integrity via 5-Ω ron and 5-pF Cio(OFF), preventing timing jitter and setup/hold violations. |
| Hot-Swappable Module Backplane | Portable Instrumentation Data Hub |
Use Scenario: Enabling safe insertion/removal of 5-V sensor modules into a 3.3-V powered base station without disrupting main logic. IC Role / Device Role / Timing Role: Ioff-enabled bus switch providing galvanic isolation and back-current blocking during module power sequencing. Use Value: Prevents damaging current injection into unpowered sections, satisfying IEC 61000-4-2 ESD and hot-swap reliability requirements. |
Use Scenario: Consolidating multiple analog and digital sensor outputs (1.8-V, 2.5-V, 3.3-V) onto a single low-power microcontroller ADC bus. IC Role / Device Role / Timing Role: Low-capacitance, low-leakage bus switch aggregating heterogeneous sensor signals with minimal loading. Use Value: Achieves <70 μA ICC and 5-pF Cio(OFF), extending battery life and preserving weak sensor signal fidelity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar FET bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBTD16211DGGR | Higher ron (9 Ω typ), 3.3-V only VCC range, no Ioff support | Lacks partial-power-down capability; unsuitable for hot-swap systems | Choose only for cost-sensitive 3.3-V-only designs where Ioff is not required. |
| SN74AVC16T245DGGR | Direction-controlled (not bidirectional), 16-bit, higher ICC (200 μA), supports 1.2–3.6 V | Requires direction pin management; adds firmware overhead and layout complexity | Select when strict unidirectional flow control is needed and lower leakage is secondary. |
Compared with SN74CB3T16211, SN74CBTD16211 offers lower cost but sacrifices Ioff safety and voltage flexibility, while SN74AVC16T245 provides wider VCC range but introduces direction-control latency and higher static power - making SN74CB3T16211 optimal for bidirectional, hot-pluggable, mixed-voltage bus isolation.
Availability
SN74CB3T16211 is available at Aetrix Electronics and suitable for PCI interface isolation, multi-rail memory interconnects, hot-swappable backplanes, and portable instrumentation data aggregation requiring stable component supply and long-term lifecycle assurance.
Supply support for SN74CB3T16211 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 industrial, automotive, and communications markets.
The SN74CB3T16211 belongs to TI's Widebus™ family of high-speed bus switches, engineered specifically for low-latency, bidirectional voltage translation in mixed-signal, multi-rail digital systems.
FAQ
What is the maximum operating voltage on the I/O pins of the SN74CB3T16211?
The SN74CB3T16211 supports a VI/O range of –0.5 V to 7 V absolute maximum, with recommended operation from 0 V to 5.5 V. This 5-V tolerance holds whether VCC is powered (2.3–3.6 V) or fully off (0 V), enabling robust interfacing with legacy 5-V logic without external clamping.
Does the SN74CB3T16211 require external pull-up resistors on its I/O lines?
The SN74CB3T16211 does not require external pull-ups on data I/O lines for basic switching operation. However, when driving a pulldown resistor and operating at low frequency, output voltage may sag below VCC due to internal pullup current source limitations - in such cases, a VCC-referenced pullup is recommended to maintain full logic-high levels.
Can the SN74CB3T16211 be used as a single 24-bit bus switch?
Yes, the SN74CB3T16211 can operate as one 24-bit bus switch by tying 1OE and 2OE together and driving them jointly. Its internal architecture supports this configuration, maintaining consistent ron, tpd, and Cio(OFF) across all 24 channels without performance degradation.
How does the Ioff feature function in the SN74CB3T16211 during power-down?
In the SN74CB3T16211, Ioff disables the internal FET channel when VCC = 0 V, limiting reverse current through I/O pins to ≤10 μA even with 5.5-V applied. This prevents backfeeding into unpowered circuitry, satisfying JESD78 latch-up immunity and enabling safe hot-swap operation in modular systems.
What package type is used for the SN74CB3T16211GQLR orderable part?
The SN74CB3T16211GQLR uses a 56-pin Very Thin Fine-Pitch Ball Grid Array (VFBGA) package designated GQL, measuring 3.5 mm × 4.5 mm with 0.5-mm ball pitch and an exposed thermal pad. It is Pb-free, RoHS-compliant, and rated MSL Level-1 for unlimited floor life.
SN74CB3T16211GQLR 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)
SN74CB3T16211GQLR FAQ
1.How can I place an order for SN74CB3T16211GQLR through Aetrix?
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For technical support, including SN74CB3T16211GQLR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CB3T16211GQLR requirements.
6.How does Aetrix verify that SN74CB3T16211GQLR is sourced from the original manufacturer or authorized distributors?
All SN74CB3T16211GQLR 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 SN74CB3T16211GQLR meets industry standards.
7.What is the process for return or replacement of SN74CB3T16211GQLR?
All SN74CB3T16211GQLR units undergo pre-shipment inspection (PSI). If there is an issue with SN74CB3T16211GQLR, 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 SN74CB3T16211GQLR part is unused and in its original packaging.
Return procedure for SN74CB3T16211GQLR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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