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Texas Instruments SN74CBTS16211DL
- Part No.:
- SN74CBTS16211DL
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 56-BSSOP (0.295", 7.50mm Width)
- Datasheet:
-
SN74CBTS16211DL.pdf
- Description:
- IC BUS SWITCH 12 X 1:1 56SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,000
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Product details
Overview
SN74CBTS16211DL 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, dual 12-bit or single 24-bit configurable operation, and operates from –40°C to 85°C.
For engineers reviewing the SN74CBTS16211DL datasheet, SN74CBTS16211DL pinout, SN74CBTS16211DL application, or SN74CBTS16211DL equivalent, this page delivers verified electrical specs, package mapping to SSOP-56 (DL), functional role in hot-swap and level-shifting systems, and validated alternative options for bus isolation design.
Technical Context
The SN74CBTS16211DL implements two independent 12-bit FET-based analog switches controlled by separate OE inputs (1OE and 2OE), enabling selective connection of A-port to B-port with minimal RC delay. Its low on-resistance (5–7 Ω) and integrated Schottky clamps suppress undershoot transients on I/O lines.
It supports TTL-compatible input thresholds (VIL ≤ 0.8 V, VIH ≥ 2 V) and operates across 4–5.5 V supply range. The device exhibits low dynamic power consumption (ICC ≤ 3 µA static, ∆ICC ≤ 2.5 mA per active control input) and maintains signal integrity with Cio(OFF) = 5.5 pF and Ci = 3 pF.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| On-state resistance (ron) | 5–7 Ω - Enables low-loss signal pass-through with <10 mV voltage drop at 30 mA, critical for maintaining logic margins in high-speed buses. |
| Propagation delay (tpd) | 0.25 ns at VCC = 5 V - Supports >1 GHz switching rates in memory address/data paths without timing skew. |
| Supply voltage (VCC) | 4–5.5 V - Compatible with 5-V TTL and mixed-voltage system backplanes requiring robust rail tolerance. |
| Input clamp current (IIK) | –50 mA - Protects against –1.2 V undershoot events via internal Schottky diodes, eliminating need for external TVS. |
| Off-state capacitance (Cio) | 5.5 pF - Minimizes capacitive loading on driven nets, preserving signal rise/fall times in multi-drop bus topologies. |
| Operating temperature | –40°C to 85°C - Qualified for industrial-grade embedded controllers, telecom line cards, and test equipment. |
| Control input leakage (IIH/IIL) | ±150 µA / ±1 µA - Ensures reliable enable/disable behavior with standard CMOS/TTL drivers without pull-up/down burden. |
Pinout & Package
SN74CBTS16211DL is housed in a 56-pin SSOP (Shrink Small-Outline Package) with 0.5-mm pitch, 11.4 mm × 7.9 mm body size, and 1.2 mm max height - compliant with JEDEC MO-194. Pin 1 is located in quadrant Q1 per tape-and-reel orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE | Active-low enable inputs | Independently activate 12-bit switch banks; low = A↔B path enabled, high = high-impedance isolation. |
| 1A1–1A12, 2A1–2A12 | Input ports | Source-side terminals for each 12-bit bank; accept TTL/CMOS logic levels and drive downstream loads. |
| 1B1–1B12, 2B1–2B12 | Output ports | Sink-side terminals; bidirectionally pass signals with matched impedance and Schottky-clamped I/O. |
| VCC | Power supply | Single 4–5.5 V rail powers all switch FETs and internal logic; decoupling required within 1 cm of pin 27. |
| GND (Pins 8, 17, 32, 43) | Ground reference | Four dedicated ground pins minimize ground bounce and ensure stable return path for 24-bit parallel switching. |
| NC (Pins 1, 56) | No internal connection | Unbonded pads - must remain unconnected; no routing or thermal relief required. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent 12-bit banks | Enables flexible partitioning - e.g., isolate address vs. data bus segments or support two independent peripheral interfaces. |
| Schottky diode clamping on all I/Os | Prevents negative undershoot below –1.2 V during fast edge transitions, eliminating external clamping components. |
| 5-Ω typical on-resistance | Reduces insertion loss and maintains signal amplitude integrity across 24-bit parallel traces up to 100 MHz. |
| TTL-compatible control and I/O | Direct interface with legacy 5-V microcontrollers, FPGAs, and ASICs without level-shifter circuitry. |
| Low dynamic power (∆ICC ≤ 2.5 mA per OE) | Minimizes supply current spikes during switching events, easing decoupling design in dense PCB layouts. |
Applications
| Memory Interfacing | Hot-Swappable Backplane |
|---|---|
|
Use Scenario: Isolating DRAM address/data buses between CPU and memory controller during power sequencing or fault recovery. IC Role / Device Role / Timing Role: Bidirectional 24-bit analog switch providing zero-delay signal pass-through or high-Z isolation under OE control. Use Value: Prevents bus contention during reset; enables clean power-up sequence with 0.25 ns tpd preserving setup/hold timing margins. |
Use Scenario: Enabling safe insertion/removal of line cards in telecom chassis without disrupting active data lanes. IC Role / Device Role / Timing Role: Bus switch isolating card-local signals from backplane when OE is deasserted during hot-plug detection. Use Value: Schottky clamps suppress ESD-induced undershoot during connector mating; 5-Ω ron avoids signal reflection. |
| Level Translation Interface | Test Access Multiplexer |
|
Use Scenario: Bridging 5-V legacy peripherals to 3.3-V FPGA I/O banks while maintaining TTL logic thresholds. IC Role / Device Role / Timing Role: Passive voltage-domain agnostic switch - no internal logic, no level-shifting circuitry needed. Use Value: Eliminates need for active translators; preserves edge rate with sub-nanosecond tpd and 5.5 pF off-capacitance. |
Use Scenario: Routing JTAG or boundary-scan signals from shared test controller to multiple ASICs on a board. IC Role / Device Role / Timing Role: Low-capacitance multiplexer selecting one of four 24-bit scan chains using OE-driven bank selection. Use Value: 3 pF control-input capacitance ensures fast OE toggling; 5.5 pF off-state isolation prevents crosstalk between inactive chains. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBT16211DGGR | TSSOP-56 (DGG) package; identical electrical specs but 64°C/W θJA vs. DL's 56°C/W; same pinout and function. | Better suited for reflow-soldered high-density boards where TSSOP footprint saves area over SSOP. | Select SN74CBT16211DGGR if board space is constrained and thermal margin allows higher junction temp rise. |
| SN74CBTD16211DGVR | TVSOP-56 (DGV) package; 48°C/W θJA; same ron/tpd but lower thermal resistance; RoHS-compliant NIPDAU finish. | Ideal for thermally demanding industrial environments requiring enhanced heat dissipation and lead-free compliance. | Choose SN74CBTD16211DGVR when operating near 85°C ambient and strict RoHS/MSL-1 requirements apply. |
Compared with SN74CBTS16211DL, SN74CBT16211DGGR offers identical functionality in a smaller TSSOP footprint but with higher thermal resistance, while SN74CBTD16211DGVR provides superior thermal performance and RoHS compliance in a thinner TVSOP package - both retain pin-for-pin compatibility and require no schematic or layout changes.
Availability
SN74CBTS16211DL is available at Aetrix Electronics and suitable for memory subsystems, hot-swappable telecom modules, and industrial backplane interfaces requiring stable component supply, long-term obsolescence management, and traceable sourcing.
Supply support for SN74CBTS16211DL 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 decades of expertise in high-reliability logic and interface solutions.
The SN74CBTS16211DL belongs to TI's Widebus™ family of high-speed bus switches, engineered specifically for low-latency, low-distortion signal routing in memory, computing, and communications infrastructure.
FAQ
What is the maximum undershoot voltage the SN74CBTS16211DL can safely clamp?
The SN74CBTS16211DL integrates Schottky diodes that clamp input/output undershoot to –1.2 V when II = –18 mA, as specified in the absolute maximum ratings table. This protects downstream logic from negative transients without external components. The clamping action is effective across the full operating temperature range (–40°C to 85°C) and applies to all 24 I/O pins. SN74CBTS16211DL achieves this with no additional biasing or external circuitry.
Does the SN74CBTS16211DL support bidirectional signal flow?
Yes, the SN74CBTS16211DL supports fully bidirectional signal flow between A and B ports - there is no designated input or output side. When 1OE is low, signals pass freely between 1A1–1A12 and 1B1–1B12 regardless of direction. The same applies to the 2A/2B bank under 2OE control. This makes SN74CBTS16211DL ideal for data bus isolation where read/write traffic flows both ways.
What is the recommended decoupling strategy for the SN74CBTS16211DL?
TI recommends placing a 0.1-µF ceramic capacitor between VCC (pin 27) and the nearest GND pin (e.g., pin 17 or 32), located within 1 cm of the package. For systems with heavy simultaneous switching, add a bulk 4.7-µF tantalum or aluminum electrolytic capacitor near the power entry point. SN74CBTS16211DL's low ICC (≤3 µA) reduces average current demand, but fast tpd (0.25 ns) necessitates low-inductance local decoupling to suppress supply noise.
Can the SN74CBTS16211DL be used with 3.3-V logic systems?
The SN74CBTS16211DL is rated for VCC = 4–5.5 V and requires TTL-compatible input thresholds (VIH ≥ 2 V, VIL ≤ 0.8 V), making it compatible with 3.3-V outputs only if those outputs meet TTL voltage levels - many 3.3-V CMOS drivers do. However, SN74CBTS16211DL cannot be powered from 3.3 V. For native 3.3-V operation, consider TI's SN74CBT3244 or SN74CBT16210 families instead of SN74CBTS16211DL.
How does the SN74CBTS16211DL handle unused control inputs?
All unused control inputs - including 1OE and 2OE - must be held at a defined logic level (VCC or GND) to prevent floating states that could cause partial turn-on, increased ICC, or unpredictable switching behavior. TI's application report SCBA004 explicitly warns against leaving CMOS control inputs unconnected. For SN74CBTS16211DL, tie unused OE pins directly to VCC via a 10-kΩ resistor or hard-connect to rail depending on system architecture.
SN74CBTS16211DL 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
SN74CBTS16211DL FAQ
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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 SN74CBTS16211DL?
For technical support, including SN74CBTS16211DL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBTS16211DL requirements.
6.How does Aetrix verify that SN74CBTS16211DL is sourced from the original manufacturer or authorized distributors?
All SN74CBTS16211DL 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 SN74CBTS16211DL meets industry standards.
7.What is the process for return or replacement of SN74CBTS16211DL?
All SN74CBTS16211DL units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBTS16211DL, 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 SN74CBTS16211DL part is unused and in its original packaging.
Return procedure for SN74CBTS16211DL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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