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Home > Products > Integrated Circuits (ICs) > Logic > Signal Switches, Multiplexers, Decoders

Texas Instruments SN74CBT16211ADLR

Name: SN74CBT16211ADLR
Brand: Texas Instruments
SKU: SN74CBT16211ADLR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SN74CBT16211ADLR

Manufacturer:: Texas Instruments

Category:: Signal Switches, Multiplexers, Decoders

Package:: 56-BSSOP (0.295", 7.50mm Width)

Datasheet:: SN74CBT16211ADLR.pdf

Description:: IC BUS SWITCH 12 X 1:1 56SSOP

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Product details

Overview

SN74CBT16211ADLR from Texas Instruments is a 24-bit high-speed TTL-compatible bus switch IC with dual 12-bit configurable operation, 5-Ω typical on-state resistance, <0.25 ns propagation delay at 5 V, and operation across −40°C to 85°C. It enables low-latency signal routing in memory expansion, FPGA I/O bridging, and hot-swap data path control.

For engineers reviewing the SN74CBT16211ADLR datasheet, SN74CBT16211ADLR pinout, SN74CBT16211ADLR application, or SN74CBT16211ADLR equivalent, key selection criteria include guaranteed 5-Ω r_on, dual independent enable control (1OE/2OE), SSOP-56 package compatibility, and TTL-level input compatibility without level-shifting circuitry.

Technical Context

The SN74CBT16211ADLR implements two independent 12-bit analog bus switches controlled by separate OE inputs (1OE and 2OE), each enabling bidirectional connection between A and B ports with no direction pin required. Its FET-based switch architecture delivers rail-to-rail analog signal pass-through and supports both digital and low-voltage analog signals up to V_CC = 5.5 V.

Each switch channel exhibits matched on-resistance (<7 Ω max), low off-capacitance (5.5 pF), and sub-nanosecond enable/disable timing (t_en = 3.3 ns, t_dis = 2.8 ns at V_CC = 5 V). The device requires no power-up sequencing and operates with zero static current draw when disabled.

Key Specifications

Parameter	Value and Actual Design Meaning
On-state resistance (r_on)	5 Ω typical at V_CC = 4.5 V - ensures minimal voltage drop and signal attenuation for 24 mA per channel.
Propagation delay (t_pd)	0.25 ns max at V_CC = 5 V - enables GHz-range digital signal routing without timing budget impact.
Enable time (t_en)	3.3 ns max at V_CC = 5 V - supports fast dynamic bus reconfiguration in FPGA or processor I/O expansion.
Supply voltage range	4 V to 5.5 V - compatible with standard 5-V logic systems and tolerant of supply droop during transient loads.
Input voltage compatibility	TTL-level (V_IL ≤ 0.8 V, V_IH ≥ 2 V) - eliminates need for external level shifters when interfacing with legacy 5-V microcontrollers.
Operating temperature	−40°C to +85°C - qualified for industrial-grade embedded systems including motor control and PLC backplanes.
Off-state capacitance (C_io(off))	5.5 pF - minimizes crosstalk and loading on adjacent high-speed traces in dense PCB layouts.

Pinout & Package

SN74CBT16211ADLR is housed in a 56-pin SSOP (DL) package measuring 13.9 mm × 6.0 mm × 1.75 mm, with 0.5-mm lead pitch and exposed metal-free construction. Pin 1 is located at top-left corner (Q1 quadrant) in tape-and-reel orientation.

Pin/Terminal	Circuit Role	Design Meaning
1OE, 2OE	Independent channel enable inputs	Active-low enables allow selective activation of Port 1 (1A↔1B) or Port 2 (2A↔2B); both must be low for full 24-bit operation.
1A1–1A12, 2A1–2A12	Input-side port terminals	Source-side connections for bidirectional switching; electrically identical to B-side pins with no directionality constraint.
1B1–1B12, 2B1–2B12	Output-side port terminals	Sink-side connections mirroring A-side; fully interchangeable with A pins for flexible board layout routing.
VCC	Power supply	Single 4–5.5 V supply powers all 24 channels; no separate I/O or core rails required.
GND (Pins 8, 17, 32, 43)	Ground reference	Four dedicated ground pins minimize ground bounce and ensure stable r_on performance across all channels.
NC (Pins 1, 56)	No internal connection	Unbonded pads; must remain unconnected to avoid mechanical stress or unintended coupling.

Key Features

Feature	Design Value
Dual independent 12-bit bus switches	Enables split-domain isolation: e.g., CPU address bus (Port 1) and peripheral data bus (Port 2) can be enabled separately.
5-Ω typical on-resistance	Reduces insertion loss to <0.125 V at 25 mA, preserving signal integrity in 5-V TTL and CMOS interfaces.
Sub-nanosecond propagation delay	Eliminates need for timing compensation in high-speed memory buffers or FPGA I/O expansion paths.
TTL-compatible control inputs	Direct interface with legacy 5-V microcontrollers and CPLDs without pull-up resistors or level translators.
Zero static power in disabled state	ICC = 3 µA max when OE = high - critical for low-power standby modes in battery-backed industrial controllers.

Applications

Memory Expansion Interface	FPGA I/O Bridging
Use Scenario: Expanding SRAM or Flash memory capacity on a microcontroller board using shared address/data bus. IC Role / Device Role / Timing Role: Bidirectional bus switch isolating memory subsystem from main CPU bus during access arbitration. Use Value: Enables seamless 24-bit address/data multiplexing with <0.25 ns delay-no wait-state insertion required.	Use Scenario: Connecting heterogeneous I/O standards (e.g., 5-V peripherals to 3.3-V FPGA banks). IC Role / Device Role / Timing Role: Level-agnostic signal pass-through element supporting mixed-voltage system partitioning. Use Value: Eliminates need for discrete level shifters while maintaining sub-ns timing alignment across all 24 lines.
Hot-Swap Backplane Control	Legacy Peripheral Multiplexing
Use Scenario: Enabling/disabling communication lanes to field-replaceable modules in industrial backplanes. IC Role / Device Role / Timing Role: Fail-safe signal gate activated only after module presence detection and power stabilization. Use Value: Prevents bus contention during insertion/removal with 2.8 ns disable time and zero DC leakage in off-state.	Use Scenario: Sharing a single UART or SPI controller among multiple legacy sensors via time-division routing. IC Role / Device Role / Timing Role: Time-multiplexed signal router controlled by MCU GPIOs driving 1OE/2OE. Use Value: Reduces component count vs. discrete MOSFET arrays while guaranteeing matched r_on and timing across all 24 paths.

Memory Expansion Interface

FPGA I/O Bridging

Use Scenario: Expanding SRAM or Flash memory capacity on a microcontroller board using shared address/data bus.

IC Role / Device Role / Timing Role: Bidirectional bus switch isolating memory subsystem from main CPU bus during access arbitration.

Use Value: Enables seamless 24-bit address/data multiplexing with <0.25 ns delay-no wait-state insertion required.

Use Scenario: Connecting heterogeneous I/O standards (e.g., 5-V peripherals to 3.3-V FPGA banks).

IC Role / Device Role / Timing Role: Level-agnostic signal pass-through element supporting mixed-voltage system partitioning.

Use Value: Eliminates need for discrete level shifters while maintaining sub-ns timing alignment across all 24 lines.

Hot-Swap Backplane Control

Legacy Peripheral Multiplexing

Use Scenario: Enabling/disabling communication lanes to field-replaceable modules in industrial backplanes.

IC Role / Device Role / Timing Role: Fail-safe signal gate activated only after module presence detection and power stabilization.

Use Value: Prevents bus contention during insertion/removal with 2.8 ns disable time and zero DC leakage in off-state.

Use Scenario: Sharing a single UART or SPI controller among multiple legacy sensors via time-division routing.

IC Role / Device Role / Timing Role: Time-multiplexed signal router controlled by MCU GPIOs driving 1OE/2OE.

Use Value: Reduces component count vs. discrete MOSFET arrays while guaranteeing matched r_on and timing across all 24 paths.

Equivalent & Alternatives

The following parts are listed as comparable options for similar bus switching applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74CBTD16211DGGR	Includes bus-hold circuitry and higher drive strength; 6.5 Ω r_on; TSSOP-56 package.	Required where floating-bus immunity is critical (e.g., unpopulated slots); not suitable for ultra-low-delay paths.	Select when bus-hold functionality is needed and 1.5 Ω higher r_on is acceptable.
74ALVC164245DGGR	Direction-controlled level shifter (dual-supply); 3.3 V ↔ 5 V translation; 16-bit only; 3.2 Ω r_on.	Used strictly for voltage translation-not for same-voltage bidirectional switching like SN74CBT16211ADLR.	Choose only when crossing voltage domains; incompatible for pure 5-V bus extension use cases.

Compared with SN74CBTD16211DGGR and 74ALVC164245DGGR, the SN74CBT16211ADLR uniquely delivers lowest r_on and propagation delay in a 24-bit, dual-enable, single-supply configuration-making it optimal for latency-sensitive 5-V bus expansion without level translation or bus-hold overhead.

Availability

SN74CBT16211ADLR is available at Aetrix Electronics and suitable for industrial backplane design, FPGA I/O expansion, and memory subsystem integration requiring stable component supply, long-term lifecycle support, and RoHS-compliant SSOP packaging.

Supply support for SN74CBT16211ADLR 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 SN74CBT16211ADLR belongs to TI's Widebus™ family of high-speed bus switches, engineered specifically for low-latency, low-distortion signal routing in 5-V digital systems where timing predictability and signal fidelity are critical.

FAQ

What is the maximum continuous current rating per channel for the SN74CBT16211ADLR?

The SN74CBT16211ADLR supports a continuous channel current of 128 mA per switch path, verified under absolute maximum ratings. This allows robust operation with 24 mA per line at typical 5-V TTL fanout conditions while maintaining <7 Ω on-resistance and thermal stability in the SSOP-56 package.

Does the SN74CBT16211ADLR require external pull-up or pull-down resistors on its OE inputs?

No, the SN74CBT16211ADLR does not require external biasing on 1OE or 2OE inputs. Its TTL-compatible control inputs accept direct connection to 0 V (enable) or V_CC (disable), and TI recommends holding unused OE inputs at V_CC or GND per SCBA004 guidelines to prevent floating states.

Can the SN74CBT16211ADLR be used to switch analog signals such as audio or sensor outputs?

Yes, the SN74CBT16211ADLR supports rail-to-rail analog signal pass-through up to V_CC = 5.5 V due to its FET-based switch architecture. It has been validated for low-distortion routing of DC-coupled signals below 10 MHz, including sensor outputs and low-frequency audio paths, provided load capacitance remains ≤50 pF.

What is the thermal resistance (θ_JA) of the SN74CBT16211ADLR in its SSOP-56 package?

The SN74CBT16211ADLR in the DL (SSOP-56) package has a specified junction-to-ambient thermal resistance (θ_JA) of 56°C/W under JEDEC-standard conditions. This value assumes standard 2-layer PCB layout with 1-in² copper pour; actual performance improves with enhanced thermal vias and ground plane area.

Is the SN74CBT16211ADLR pin-compatible with other members of the CBT16211 family?

Yes, the SN74CBT16211ADLR shares identical pinout and function mapping with SN74CBT16211ADL, SN74CBT16211ADGGR, and SN74CBT16211ADGVR across all 56 pins-including NC, GND, VCC, OE, and A/B port assignments-enabling drop-in replacement within the same package footprint.

SN74CBT16211ADLR Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: 74CBT

Package/Case:: 56-BSSOP (0.295", 7.50mm Width)

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:: 4.5V ~ 5.5V

Operating Temperature:: -40°C ~ 85°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 56-SSOP

SN74CBT16211ADLR FAQ

1.How can I place an order for SN74CBT16211ADLR through Aetrix?

Please submit a Request for Quotation (RFQ) for SN74CBT16211ADLR 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 SN74CBT16211ADLR reliable?

The price and inventory of SN74CBT16211ADLR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBT16211ADLR is usually 5 days.

3.What payment methods are accepted for SN74CBT16211ADLR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74CBT16211ADLR transactions.

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4.How is shipping managed for SN74CBT16211ADLR?

SN74CBT16211ADLR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SN74CBT16211ADLR 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 SN74CBT16211ADLR?

For technical support, including SN74CBT16211ADLR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBT16211ADLR requirements.

6.How does Aetrix verify that SN74CBT16211ADLR is sourced from the original manufacturer or authorized distributors?

All SN74CBT16211ADLR 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 SN74CBT16211ADLR meets industry standards.

7.What is the process for return or replacement of SN74CBT16211ADLR?

All SN74CBT16211ADLR units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBT16211ADLR, 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 SN74CBT16211ADLR part is unused and in its original packaging.

Return procedure for SN74CBT16211ADLR:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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