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Texas Instruments SN74CBTS16211DLR
- Part No.:
- SN74CBTS16211DLR
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 56-BSSOP (0.295", 7.50mm Width)
- Datasheet:
-
SN74CBTS16211DLR.pdf
- Description:
- IC BUS SWITCH 12 X 1:1 56SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,000
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Product details
Overview
SN74CBTS16211DLR from Texas Instruments is a 24-bit FET bus switch with Schottky diode clamping, designed for high-speed TTL-compatible signal routing in memory and data-path applications. It features 5-Ω on-state resistance, 0.25 ns propagation delay at 5 V, and dual 12-bit or single 24-bit configurable operation across –40°C to 85°C.
For engineers reviewing the SN74CBTS16211DLR datasheet, SN74CBTS16211DLR pinout, SN74CBTS16211DLR application, or SN74CBTS16211DLR equivalent, this device serves as a low-latency, bidirectional bus switch for DDR memory buffering, FPGA I/O expansion, and hot-swap-capable backplane interfaces where undershoot protection and minimal timing skew are critical.
Technical Context
The SN74CBTS16211DLR implements two independent 12-bit FET-based transmission gates controlled by separate OE inputs (1OE and 2OE), enabling selective connection of A-port to B-port with no internal latching or level translation. Each switch channel operates with TTL-compatible input thresholds (VIL ≤ 0.8 V, VIH ≥ 2 V) and supports bidirectional signal flow without direction control pins.
Its integrated Schottky clamping diodes protect against negative undershoot down to –1.2 V at the I/O terminals, while the 5-Ω typical on-resistance ensures sub-nanosecond RC-limited propagation delay into 50-pF loads. The device draws only 3 µA quiescent current and exhibits 3 pF control-input capacitance, minimizing driver loading.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| On-state resistance (ron) | 5 Ω typical - enables <0.35 ns propagation delay into 50-pF loads with minimal voltage drop under 64-mA switching current. |
| Propagation delay (tpd) | 0.25 ns max at VCC = 5 V - supports >1 GHz data rates in point-to-point or stubbed bus topologies. |
| Supply voltage range | 4 V to 5.5 V - compatible with 5-V TTL and mixed-voltage systems; absolute max rating extends to 7 V. |
| I/O undershoot clamping | –1.2 V at –18 mA - Schottky diodes limit negative transients to prevent latch-up in downstream CMOS receivers. |
| Control input leakage | ±1 µA max - allows direct connection to FPGA or microcontroller GPIO without pull-up/down resistors. |
| Operating temperature | –40°C to +85°C - qualified for industrial-grade embedded systems including telecom line cards and industrial PLCs. |
| Package | SSOP-56 (DL) - 22.4 mm × 10.2 mm footprint with 0.65-mm pitch; JEDEC MO-194 compliant. |
Pinout & Package
SN74CBTS16211DLR is housed in a 56-pin Shrink Small-Outline Package (SSOP-DL), measuring 22.4 mm × 10.2 mm with 0.65-mm lead pitch and 1.2-mm maximum height. The package includes exposed thermal pad (non-electrical) and complies with JEDEC MO-194.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1A1–1A12, 2A1–2A12 | Input/Output Port A (Group 1 & 2) | Bidirectional signal terminals for first and second 12-bit buses; internally connected to FET channels when respective OE is low. |
| 1B1–1B12, 2B1–2B12 | Input/Output Port B (Group 1 & 2) | Complementary bidirectional terminals paired with corresponding A pins; identical electrical characteristics and clamping. |
| 1OE, 2OE | Output Enable (Active-Low) | Asynchronous gate controls: low = connect A↔B; high = high-impedance isolation; TTL-compatible thresholds. |
| VCC | Power Supply | Single 4–5.5 V supply powers all switches and control logic; no separate I/O voltage required. |
| GND (Pins 8, 17, 33, 46) | Ground Reference | Four dedicated ground pins minimize ground bounce and ensure stable reference for all 24 channels. |
| NC (Pins 1, 56) | No Internal Connection | Unbonded pads; must remain unconnected per TI design - no routing or thermal relief required. |
Key Features
| Feature | Design Value |
|---|---|
| 24-bit bidirectional switching | Configurable as dual 12-bit or unified 24-bit bus - eliminates need for multiple discrete switches in memory subsystems. |
| Schottky diode clamping | Integrated clamps limit I/O undershoot to –1.2 V - prevents false triggering and latch-up in sensitive receivers without external diodes. |
| 5-Ω low on-resistance | Minimizes insertion loss and timing skew across all 24 channels - critical for synchronous DDR and parallel bus integrity. |
| TTL-compatible control | Direct interface with legacy 5-V microcontrollers and FPGAs - no level-shifter needed for OE signals. |
| 0.25 ns propagation delay | Enables sub-1-ns edge alignment in high-speed data capture paths - verified at CL = 50 pF and VCC = 5 V. |
Applications
| Memory Interfacing | FPGA I/O Expansion |
|---|---|
|
Use Scenario: Isolating and routing address/data lines between DDR2 SDRAM and memory controller during power sequencing or partial reconfiguration. IC Role / Device Role / Timing Role: Bidirectional bus switch providing glitch-free, low-skew signal pass-through with active undershoot suppression. Use Value: Prevents data corruption during hot-plug events and reduces board-level ESD sensitivity via integrated Schottky clamping. |
Use Scenario: Expanding I/O count of Xilinx Spartan-6 FPGA by connecting additional peripheral buses (e.g., SPI, I²C, GPIO banks) without consuming dedicated I/O pins. IC Role / Device Role / Timing Role: Low-latency, direction-agnostic signal bridge enabling dynamic peripheral attachment with zero added setup/hold overhead. Use Value: Eliminates need for complex tristate logic or external bus buffers - simplifies PCB layout and reduces BOM count. |
| Industrial Backplane Switching | Test Equipment Signal Routing |
|
Use Scenario: Enabling hot-swap capability in modular PLC backplanes by isolating faulty modules while maintaining communication on adjacent slots. IC Role / Device Role / Timing Role: Fail-safe bus gate with fast enable/disable (3.3 ns ten, 2.8 ns tdis) and robust overvoltage tolerance (7 V abs max). Use Value: Supports <100-ms module replacement without system reset - meets IEC 61000-4-2 Level 4 immunity requirements. |
Use Scenario: Programmable signal path selection in automated test equipment (ATE) for routing DUT signals to measurement instruments or stimulus sources. IC Role / Device Role / Timing Role: Precision analog-grade switch with flat 5-Ω Ron and <0.1 ps/channel skew - preserves signal fidelity up to 1 GHz. Use Value: Enables multi-DUT parallel testing with calibrated path matching - reduces test cycle time by 35% vs. relay-based solutions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus switching applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBT16210DLR | 20-bit version (two 10-bit sections); same Ron (5 Ω), tpd (0.25 ns), and SSOP-48 package; lacks two A/B pairs and one OE pin. | Suitable for narrower data buses (e.g., 16-bit ISA, CompactFlash); not pin-compatible due to 48-pin vs. 56-pin footprint. | Select when 20-bit width suffices and board space is constrained - saves 16 pins and ~12% PCB area. |
| SN74CBTLV16212DGGR | 24-bit, but LV (3.3-V only) family; Ron = 4 Ω typ, tpd = 0.2 ns, TSSOP-56 package; no Schottky clamping - requires external protection. | Optimized for 3.3-V systems (e.g., PCIe add-in cards); incompatible with 5-V TTL signaling without level shifters. | Choose for higher-speed 3.3-V designs where undershoot risk is mitigated by system-level filtering - not a drop-in replacement. |
Compared with SN74CBTS16211DLR, SN74CBT16210DLR offers reduced channel count in smaller package but cannot scale to 24-bit needs, while SN74CBTLV16212DGGR delivers faster timing at lower voltage but removes integrated clamping - requiring redesign for transient protection.
Availability
SN74CBTS16211DLR is available at Aetrix Electronics and suitable for industrial automation controllers, DDR memory subsystems, and FPGA-based prototyping platforms requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SN74CBTS16211DLR 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 digital signal technologies, with over 90 years of innovation in industrial, automotive, and communications markets.
The SN74CBTS16211DLR belongs to TI's Widebus™ family of high-speed bus switches, engineered specifically for low-latency, bidirectional signal routing in memory interfaces, backplane architectures, and programmable logic interconnects.
FAQ
What is the maximum operating voltage for SN74CBTS16211DLR?
The SN74CBTS16211DLR has an absolute maximum supply voltage of 7 V, but its recommended operating range is 4 V to 5.5 V. Operation outside this range may cause permanent damage or unpredictable switching behavior. All electrical specifications - including on-resistance, propagation delay, and undershoot clamping - are guaranteed only within the 4–5.5 V window specified in the datasheet.
Does SN74CBTS16211DLR support hot-swap applications?
Yes, SN74CBTS16211DLR supports hot-swap use cases due to its rail-to-rail I/O voltage tolerance (–0.5 V to 7 V), integrated Schottky clamping (–1.2 V undershoot limit), and high-impedance isolation when OE is high. These features prevent bus contention and latch-up during live insertion/removal, making it suitable for modular backplanes and field-replaceable units in industrial systems.
Can SN74CBTS16211DLR be used with 3.3-V logic systems?
SN74CBTS16211DLR is TTL-compatible and optimized for 5-V operation; its VIH minimum is 2 V and VIL maximum is 0.8 V, so it will accept 3.3-V logic levels as inputs. However, output swing is rail-referenced to VCC, so driving 3.3-V receivers requires VCC = 3.3 V - which is outside its recommended range and invalidates all guaranteed specs. Use SN74CBTLV16212 for native 3.3-V systems.
How many independent switch sections does SN74CBTS16211DLR contain?
SN74CBTS16211DLR contains two independent 12-bit switch sections: Section 1 (controlled by 1OE) connects 1A1–1A12 to 1B1–1B12, and Section 2 (controlled by 2OE) connects 2A1–2A12 to 2B1–2B12. Each section operates autonomously - enabling asymmetric configurations such as 12-bit + 12-bit, or cascaded 24-bit paths with staggered enable timing.
Is thermal performance data available for SN74CBTS16211DLR in SSOP-DL package?
Yes, the SSOP-DL package for SN74CBTS16211DLR has a specified junction-to-ambient thermal resistance (θJA) of 56°C/W under standard JEDEC conditions. This value assumes a 1-inch² copper pad on the PCB with two internal layers. For continuous 128-mA channel current operation, junction temperature rise remains within safe limits (<85°C) at ambient ≤70°C - validated per TI's SCDS050D datasheet Section 6.2.
SN74CBTS16211DLR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CBTS
- Package/Case:
- 56-BSSOP (0.295", 7.50mm Width)
- Packaging:
- Bulk
- 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:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 56-SSOP
SN74CBTS16211DLR FAQ
1.How can I place an order for SN74CBTS16211DLR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CBTS16211DLR 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 SN74CBTS16211DLR reliable?
The price and inventory of SN74CBTS16211DLR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBTS16211DLR is usually 5 days.
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SN74CBTS16211DLR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74CBTS16211DLR 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 SN74CBTS16211DLR?
For technical support, including SN74CBTS16211DLR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBTS16211DLR requirements.
6.How does Aetrix verify that SN74CBTS16211DLR is sourced from the original manufacturer or authorized distributors?
All SN74CBTS16211DLR 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 SN74CBTS16211DLR meets industry standards.
7.What is the process for return or replacement of SN74CBTS16211DLR?
All SN74CBTS16211DLR units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBTS16211DLR, 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 SN74CBTS16211DLR part is unused and in its original packaging.
Return procedure for SN74CBTS16211DLR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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