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Texas Instruments SN74CB3T16211ZQLR
- Part No.:
- SN74CB3T16211ZQLR
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 56-VFBGA
- Datasheet:
-
SN74CB3T16211ZQLR.pdf
- Description:
- IC BUS SWITCH 12 X 1:1 56BGA
- Quantity:
- Payment:
- Shipping:
Inventory:4,035
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Product details
Overview
SN74CB3T16211ZQLR from Texas Instruments is a 24-bit FET bus switch IC supporting mixed-mode voltage translation across 2.3 V–3.6 V VCC, with 5-V tolerant I/Os, 5 Ω typical ON-state resistance, and bidirectional near-zero-delay signal routing. It serves as a level-shifting bus isolator in multi-voltage system interconnects such as PCI interfaces and memory expansion subsystems.
For engineers reviewing the SN74CB3T16211ZQLR datasheet, SN74CB3T16211ZQLR pinout, SN74CB3T16211ZQLR application, or SN74CB3T16211ZQLR equivalent, key selection criteria include its dual 12-bit independent enable control, 5-V tolerance during power-up/down, Ioff partial-power-down support, and 5 pF OFF-state I/O capacitance for high-speed signal integrity.
Technical Context
The SN74CB3T16211ZQLR implements two independent 12-bit FET-based bus switches, each controlled by dedicated OE inputs (1OE, 2OE), enabling selective isolation of A↔B data paths. Its gate drive architecture tracks VCC to deliver output voltage translation matching the supply rail-supporting 5-V-to-3.3-V and 5-V/3.3-V-to-2.5-V level shifting without external components.
Each switch channel features undervoltage clamp diodes on all I/Os, Ioff protection that blocks backflow current when VCC = 0 V, and guaranteed operation from –40°C to 85°C. The device maintains high-impedance isolation during power sequencing when OE is pulled up to VCC, satisfying robust system-level power management requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.3 V to 3.6 V - Enables interoperability across 2.5-V and 3.3-V logic domains while maintaining full 5-V I/O tolerance. |
| ron (Typ) | 5 Ω - Minimizes voltage drop and timing skew in high-speed data paths; supports ≤128 mA per switch channel. |
| Cio(OFF) (Typ) | 5 pF - Reduces capacitive loading on driven buses, preserving signal edge rates up to 500 Mbps. |
| tpd (Max) | 0.25 ns at 3.3 V - Near-zero propagation delay ensures cycle-accurate timing in synchronous bus architectures. |
| Ioff (Max) | 10 μA at VCC = 0 V - Prevents damaging current flow during hot-insertion or partial power-down sequences. |
| VI/O Range | 0 V to 5.5 V - Allows direct connection to 5-V TTL, 3.3-V LVTTL, and 2.5-V CMOS signaling without level-shifters. |
| ICC (Max) | 70 μA - Ultra-low quiescent current suitable for battery-powered portable equipment and always-on subsystems. |
Pinout & Package
VFBGA package (ZQL), 56-pin, 3.5 mm × 3.5 mm, 0.5 mm pitch, RoHS-compliant, moisture sensitivity level 1 (260°C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1A1–1A12, 2A1–2A12 | Data input A-side terminals | First and second 12-bit input ports; accept 0–5.5 V signals regardless of VCC state. |
| 1B1–1B12, 2B1–2B12 | Data output B-side terminals | Corresponding bidirectional output ports; voltage level tracks VCC when enabled. |
| 1OE, 2OE | Active-low enable controls | Independently activate each 12-bit switch; OE = low enables A↔B conduction; OE = high forces high-Z isolation. |
| VCC | Power supply | Single 2.3–3.6 V rail powers both switch banks and defines output voltage translation reference. |
| GND (×4) | Ground connections | Dedicated ground pins per quadrant minimize ground bounce and improve noise immunity in high-speed switching. |
| NC | No internal connection | Unbonded pads; must remain unconnected on PCB to avoid parasitic coupling or mechanical stress. |
Key Features
| Feature | Design Value |
|---|---|
| 5-V tolerant I/Os with VCC = 0 V | Enables safe hot-plug operation and backward compatibility with legacy 5-V peripherals without risk of latch-up or damage. |
| Output voltage translation tracking VCC | Eliminates need for external level translators; B-port output follows VCC (e.g., 2.5 V out with 2.5 V VCC, even if A-port receives 5 V). |
| Ioff partial-power-down support | Guarantees isolation between powered and unpowered system domains, meeting JEDEC JESD78 latch-up immunity >250 mA. |
| Bidirectional zero-bias switching | Supports transparent data flow in either direction without direction control pins-ideal for shared bus arbitration and memory-mapped I/O. |
| Undershoot clamp diodes on all I/Os | Protects against negative transients down to –1.2 V, enhancing reliability in noisy industrial or automotive ECU environments. |
Applications
| PCI Express Slot Interconnect | Multi-Rail Memory Expansion |
|---|---|
|
Use Scenario: Isolating 3.3-V PCIe root complex from 5-V legacy add-in cards while maintaining signal integrity. IC Role / Device Role / Timing Role: Bidirectional bus switch providing 5-V-tolerant, low-ron path between host and peripheral with sub-0.3 ns propagation delay. Use Value: Eliminates discrete level shifters and reduces BOM count by consolidating two independent 12-bit channels in one ZQL package. |
Use Scenario: Enabling DDR2/DDR3 memory modules operating at 2.5 V or 3.3 V to interface with SoC running at 1.8 V core voltage. IC Role / Device Role / Timing Role: Voltage-translating bus isolator that shifts address/control/data lines while preserving setup/hold timing margins. Use Value: Supports mixed-voltage memory subsystems without clock-domain crossing logic or additional timing compensation. |
| Hot-Swappable Backplane Interface | Low-Power Portable I/O Hub |
|
Use Scenario: Safely inserting/removing daughterboards in telecom or test equipment backplanes powered at different voltages. IC Role / Device Role / Timing Role: Ioff-enabled isolation switch preventing backfeed current and ensuring glitch-free insertion detection. Use Value: Meets IEC 61000-4-2 ESD immunity (2000 V HBM) and JESD22 CDM (1000 V), critical for field-replaceable units. |
Use Scenario: Managing I/O expansion in handheld medical monitors or barcode scanners requiring ultra-low standby power. IC Role / Device Role / Timing Role: Low-leakage (70 μA max ICC) bus switch enabling deep-sleep mode while retaining configuration state. Use Value: Extends battery life by reducing static power draw versus standard CMOS switches, with no external biasing required. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar FET bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBT16210PAG | 24-bit, non-level-shifting, 3.3-V only, no 5-V tolerance, higher ron (7 Ω typ) | Limited to single-rail 3.3-V systems; unsuitable for mixed-voltage or hot-swap use cases | Select only when cost is primary constraint and 5-V tolerance/Ioff are not required. |
| SN74AVC16T245DGGR | 24-bit dual-supply translator (A/B VCC pins), supports 1.2–3.6 V on both sides, but higher ICC (200 μA) and larger TSSOP package | Better for asymmetric voltage translation (e.g., 1.8-V ↔ 3.3-V), less optimal for 5-V legacy interfacing | Prefer when bidirectional translation between two independent voltage domains is needed, not just 5-V downshift. |
Compared with SN74CBT16210PAG and SN74AVC16T245DGGR, the SN74CB3T16211ZQLR uniquely combines 5-V tolerance, Ioff, and sub-0.3 ns tpd in a compact 3.5 mm × 3.5 mm ZQL package-making it the only option for space-constrained, mixed-voltage hot-swap designs requiring zero-latency isolation.
Availability
SN74CB3T16211ZQLR is available at Aetrix Electronics and suitable for PCI interface bridging, memory subsystem isolation, and low-power portable I/O expansion requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for SN74CB3T16211ZQLR 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 electronic components.
The SN74CB3T16211ZQLR belongs to TI's Widebus™ family of high-speed bus switches, engineered specifically for voltage-level agnostic interconnect in multi-rail computing, communications, and industrial control systems.
FAQ
What is the maximum data rate supported by the SN74CB3T16211ZQLR?
The SN74CB3T16211ZQLR does not specify a maximum data rate in MHz/Gbps, but its 0.25 ns maximum propagation delay and 5 pF OFF-state capacitance enable reliable operation at NRZ data rates exceeding 500 Mbps in controlled-impedance PCB environments. Signal integrity depends on layout, termination, and load capacitance-not an intrinsic bandwidth limit.
Can the SN74CB3T16211ZQLR be used with a 1.8-V VCC supply?
No. The SN74CB3T16211ZQLR requires VCC between 2.3 V and 3.6 V per its recommended operating conditions. Operation below 2.3 V is not characterized or guaranteed; attempting 1.8-V VCC may result in undefined switching behavior, increased ron, or failure to meet timing specs.
Does the SN74CB3T16211ZQLR require external pull-up resistors on its I/O lines?
External pull-ups are not required for basic switching operation, but a pull-up resistor to VCC is recommended on each B-port line when driving heavy capacitive loads or operating at low frequencies to maintain full VCC output voltage-due to the internal pullup current source's dependency on load conditions.
How does the Ioff feature of the SN74CB3T16211ZQLR protect system-level circuits?
The Ioff feature limits current to ≤10 μA when VCC = 0 V and any I/O is biased to 0–5.5 V, preventing destructive backfeed current from live buses into a powered-down subsystem. This protects downstream logic, avoids false triggering, and satisfies JEDEC JESD78 latch-up immunity requirements (>250 mA).
Is the SN74CB3T16211ZQLR pin-compatible with other packages in the same family?
No. The SN74CB3T16211ZQLR uses the ZQL VFBGA package (56-pin, 0.5 mm pitch), which has a different footprint and ball map than DGG (TSSOP), DGV (TVSOP), DL (SSOP), or GQL packages. Mechanical and thermal characteristics differ significantly-PCB redesign is required for package substitution.
SN74CB3T16211ZQLR 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)
SN74CB3T16211ZQLR FAQ
1.How can I place an order for SN74CB3T16211ZQLR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CB3T16211ZQLR 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 SN74CB3T16211ZQLR reliable?
The price and inventory of SN74CB3T16211ZQLR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CB3T16211ZQLR is usually 5 days.
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SN74CB3T16211ZQLR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74CB3T16211ZQLR 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 SN74CB3T16211ZQLR?
For technical support, including SN74CB3T16211ZQLR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CB3T16211ZQLR requirements.
6.How does Aetrix verify that SN74CB3T16211ZQLR is sourced from the original manufacturer or authorized distributors?
All SN74CB3T16211ZQLR 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 SN74CB3T16211ZQLR meets industry standards.
7.What is the process for return or replacement of SN74CB3T16211ZQLR?
All SN74CB3T16211ZQLR units undergo pre-shipment inspection (PSI). If there is an issue with SN74CB3T16211ZQLR, 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 SN74CB3T16211ZQLR part is unused and in its original packaging.
Return procedure for SN74CB3T16211ZQLR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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