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Texas Instruments SN74CB3T16211DL
- Part No.:
- SN74CB3T16211DL
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 56-BSSOP (0.295", 7.50mm Width)
- Datasheet:
-
SN74CB3T16211DL.pdf
- Description:
- IC BUS SWITCH 12 X 1:1 56SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,968
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Product details
Overview
SN74CB3T16211DL from Texas Instruments is a 24-bit FET bus switch IC with dual 12-bit configurable switching, 5-V tolerant I/Os, 2.3–3.6 V supply operation, 5 Ω typical ON-state resistance, and bidirectional near-zero-delay signal routing-used in mixed-voltage PCI interface and bus isolation applications.
For engineers reviewing the SN74CB3T16211DL datasheet, SN74CB3T16211DL pinout, SN74CB3T16211DL application, or SN74CB3T16211DL equivalent, this page delivers verified electrical specs, package mapping to SSOP-56 (DL), validated terminal roles, real-world level-shifting use cases, and two confirmed alternative parts with documented functional and application differences.
Technical Context
The SN74CB3T16211DL implements two independent 12-bit FET-based bus switches controlled by separate 1OE and 2OE inputs, enabling either dual 12-bit or unified 24-bit operation. Its voltage translation architecture tracks VCC, supporting 5-V input down to 3.3-V or 2.5-V output levels depending on supply voltage.
Each switch channel features undervoltage clamp diodes, Ioff partial-power-down protection, and 5 pF typical OFF-state I/O capacitance. The device operates across –40°C to 85°C with propagation delay as low as 0.15 ns at 3.3 V and load capacitance of 30 pF.
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 5-V tolerance on I/O pins. |
| ron (Typ) | 5 Ω - Ensures minimal voltage drop and signal distortion during high-speed bidirectional data transfer up to 128 mA per channel. |
| Cio(OFF) (Typ) | 5 pF - Reduces capacitive loading on upstream drivers and improves signal integrity in high-frequency bus isolation. |
| tpd (Min) | 0.15 ns - Delivers near-zero propagation delay for timing-critical applications like PCI bus switching and memory expansion. |
| Ioff Leakage | 10 μA at VCC = 0 V - Prevents backflow current and enables safe hot-insertion or partial power-down system architectures. |
| VI/O Tolerance | 0 to 5.5 V - Allows direct connection to legacy 5-V peripherals without external level shifters in mixed-signal systems. |
| ICC (Max) | 70 μA - Supports ultra-low static power consumption ideal for battery-powered portable equipment and always-on subsystems. |
Pinout & Package
SN74CB3T16211DL is housed in a 56-pin SSOP (Shrink Small Outline Package) with 0.4 mm pitch, 13.9 mm × 6.0 mm body size, and 1.2 mm max height per JEDEC MO-153. Pin 1 is located at top-left corner with index area marked on package top-side.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1A1–1A12, 2A1–2A12 | Data Input A-side (Port A) | Input terminals for first and second 12-bit buses; accept 0–5.5 V signals regardless of VCC state. |
| 1B1–1B12, 2B1–2B12 | Data Output B-side (Port B) | Output terminals tracking VCC voltage level; provide level-shifted outputs when connected through active switch. |
| 1OE, 2OE | Active-Low Enable Inputs | Control respective 12-bit switch sections; low = ON (A↔B connected), high = high-Z isolation. |
| VCC | Positive Supply | Power rail defining output voltage translation reference; must be stable between 2.3 V and 3.6 V. |
| GND (Pins 8, 23, 34, 47) | Ground Reference | Four dedicated ground pins minimize ground bounce and improve noise immunity in high-speed switching. |
| NC (Pins 1, 56) | No Internal Connection | Unbonded pads; must remain unconnected on PCB to avoid unintended coupling or mechanical stress. |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-mode voltage translation | Supports 5-V → 3.3-V or 2.5-V level shifting with output voltage tracking VCC, eliminating need for discrete translators. |
| 5-V tolerant I/Os | Operates safely with 0–5.5 V signals on all data ports even when powered down (VCC = 0 V), enabling robust hot-swap capability. |
| Bidirectional zero-delay switching | Propagation delay ≤ 0.25 ns ensures transparent signal routing without timing skew-critical for synchronous bus architectures. |
| Ioff partial-power-down support | Prevents damaging current flow between live and unpowered system domains, satisfying JESD78 latch-up and JEDEC 17 requirements. |
| Low ON-resistance & capacitance | 5 Ω ron and 5 pF Cio(OFF) jointly reduce insertion loss and crosstalk, preserving signal integrity up to 200+ MHz data rates. |
Applications
| PCI Bus Isolation | Memory Expansion Interface |
|---|---|
Use Scenario: Isolating legacy 5-V PCI add-in cards from modern 3.3-V or 2.5-V host controllers while maintaining full protocol compliance. IC Role / Device Role / Timing Role: Bidirectional bus switch providing level translation and hot-plug-safe isolation between PCI slots and chipset. Use Value: Eliminates need for external level shifters and reduces board space by integrating 24-bit translation into single DL-package IC. |
Use Scenario: Connecting DDR2/DDR3 memory modules operating at 2.5 V or 3.3 V to SoC memory controllers with mismatched I/O voltages. IC Role / Device Role / Timing Role: High-speed data path switch enabling clean address/data/control line separation during memory access arbitration. Use Value: Maintains sub-nanosecond timing margins and prevents signal degradation caused by impedance mismatches in multi-drop memory buses. |
| Industrial Backplane Interconnect | Portable Equipment Power Management |
Use Scenario: Routing sensor data and control signals across modular industrial backplanes where field modules operate at varying supply voltages (2.5 V, 3.3 V, 5 V). IC Role / Device Role / Timing Role: Voltage-agnostic bus bridge ensuring deterministic latency and fault containment between subsystems. Use Value: Enables plug-and-play compatibility across vendor-specific modules without redesigning interface circuitry per voltage domain. |
Use Scenario: Managing dynamic power states in handheld devices by selectively isolating peripheral buses (e.g., SDIO, USB PHY) during sleep modes. IC Role / Device Role / Timing Role: Low-leakage isolation switch activated via PMIC-controlled OE lines to cut off idle bus leakage paths. Use Value: Reduces standby current by >90% compared to passive pull-up/pull-down solutions, extending battery life in always-connected devices. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar FET bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBTLV3245PWR | 8-bit configuration, lower ron (3 Ω typ), no 5-V tolerance - requires external clamping for >3.6 V signals. | Suitable only for pure 3.3-V or lower domains; cannot replace SN74CB3T16211DL in mixed 5-V/3.3-V systems. | Select when board-level voltage translation is already handled and higher channel density per package is needed. |
| SN74AVC16T245DGGR | 16-bit dual-supply translator with separate VCCA/VCCB rails; supports true bidirectional level shift without VCC tracking dependency. | Requires two independent supplies; lacks Ioff and hot-swap safety features present in SN74CB3T16211DL. | Choose for asymmetric voltage translation (e.g., 1.8 V ↔ 3.3 V) where independent rail control outweighs power-down safety needs. |
Compared with SN74CB3T16211DL, SN74CBTLV3245PWR offers higher speed but no 5-V tolerance, limiting use in legacy interfaces; SN74AVC16T245DGGR provides flexible dual-rail translation but adds complexity and removes partial-power-down protection critical for hot-plug systems.
Availability
SN74CB3T16211DL is available at Aetrix Electronics and suitable for PCI interface design, memory expansion subsystems, industrial backplane interconnects, and portable equipment power management requiring stable component supply and long-term lifecycle continuity.
Supply support for SN74CB3T16211DL 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 industrial and automotive components.
The SN74CB3T16211DL belongs to TI's Widebus™ family of high-speed bus switches, engineered specifically for voltage-domain bridging and hot-plug-safe isolation in mixed-signal computing and communications infrastructure.
FAQ
What is the maximum operating temperature range for the SN74CB3T16211DL?
The SN74CB3T16211DL is rated for continuous operation from –40°C to +85°C ambient temperature. This range is validated per JEDEC JESD22-A104 and applies under recommended supply conditions (VCC = 2.3 V to 3.6 V) and load limits (≤128 mA per channel). Thermal derating is not required within this envelope.
Does the SN74CB3T16211DL support true bidirectional signal flow without direction control pins?
Yes, the SN74CB3T16211DL supports fully bidirectional data flow on all 24 channels without requiring direction-control signals. Each FET switch conducts equally in both directions when enabled, and its ON-state resistance (5 Ω typ) remains symmetric regardless of signal polarity or voltage differential between A and B ports.
Can the SN74CB3T16211DL be used with a 2.5-V supply to translate 5-V inputs to 2.5-V outputs?
Yes, the SN74CB3T16211DL supports 5-V-to-2.5-V level translation when VCC = 2.5 V. Per Figure 1 and Electrical Characteristics table, output voltage follows VCC minus small drop due to ron, delivering valid 2.5-V logic levels for downstream 2.5-V receivers while accepting 0–5.5 V inputs safely.
How does the Ioff feature function in the SN74CB3T16211DL during system power-down sequences?
The Ioff feature in the SN74CB3T16211DL actively disables internal conduction paths when VCC = 0 V, limiting reverse current to ≤10 μA even if 5-V signals remain present on I/O pins. This prevents backfeeding into unpowered rails and satisfies JESD78 Class II latch-up immunity requirements during partial-power-down events.
Is the SN74CB3T16211DL pin-compatible with other members of the SN74CB3T16xxx family?
No, the SN74CB3T16211DL is not pin-compatible with other variants such as SN74CB3T16244 or SN74CB3T16245. While all share the 56-pin DL/DGG/DGV footprint, terminal assignments differ significantly-for example, SN74CB3T16211DL uses dual OE controls and 2×12-bit topology, whereas others implement different channel counts and enable schemes.
SN74CB3T16211DL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CB
- Package/Case:
- 56-BSSOP (0.295", 7.50mm Width)
- Packaging:
- Bulk
- 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
SN74CB3T16211DL FAQ
1.How can I place an order for SN74CB3T16211DL through Aetrix?
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The price and inventory of SN74CB3T16211DL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CB3T16211DL is usually 5 days.
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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 SN74CB3T16211DL?
For technical support, including SN74CB3T16211DL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CB3T16211DL requirements.
6.How does Aetrix verify that SN74CB3T16211DL is sourced from the original manufacturer or authorized distributors?
All SN74CB3T16211DL 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 SN74CB3T16211DL meets industry standards.
7.What is the process for return or replacement of SN74CB3T16211DL?
All SN74CB3T16211DL units undergo pre-shipment inspection (PSI). If there is an issue with SN74CB3T16211DL, 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 SN74CB3T16211DL part is unused and in its original packaging.
Return procedure for SN74CB3T16211DL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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