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Texas Instruments SN74CBTH16211DL
- Part No.:
- SN74CBTH16211DL
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 56-BSSOP (0.295", 7.50mm Width)
- Datasheet:
-
SN74CBTH16211DL.pdf
- Description:
- IC BUS SWITCH 12 X 1:1 56SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:5,179
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Product details
Overview
SN74CBTH16211DL from Texas Instruments is a 24-bit FET bus switch with integrated bus-hold circuitry, designed for high-speed TTL-compatible signal routing in digital backplanes and memory interfaces. It features dual 12-bit independent channels, 5-Ω on-state resistance, bus-hold on all A/B I/Os, and operates from 4 V to 5.5 V across –40°C to 85°C.
For engineers reviewing the SN74CBTH16211DL datasheet, SN74CBTH16211DL pinout, SN74CBTH16211DL application, or SN74CBTH16211DL equivalent, key selection criteria include on-resistance matching, bus-hold current capability (±500 µA), OE-controlled channel isolation, and SSOP-56 thermal performance (θJA = 56°C/W).
Technical Context
The SN74CBTH16211DL implements two independent 12-bit FET-based transmission gates controlled by separate OE inputs, enabling flexible partitioning as either dual 12-bit or single 24-bit switches. Its bus-hold circuitry actively sustains valid logic levels on floating A/B terminals without external resistors.
Each channel exhibits sub-nanosecond propagation delay (0.25 ns typical at VCC = 5 V) and supports bidirectional signal flow with minimal RC-induced distortion. The device uses TTL-compatible control thresholds (VIL ≤ 0.8 V, VIH ≥ 2 V) and maintains high-impedance isolation when OE is high.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| On-state resistance (ron) | 5 Ω typical - enables low-loss signal coupling with <0.1 V drop at 64 mA per path |
| Propagation delay (tpd) | 0.25 ns typical at VCC = 5 V - supports >1 GHz data rates in short traces |
| Bus-hold drive (IBHLO/IBHHO) | ±500 µA at VCC = 5.5 V - actively holds floating lines without pull-up/down resistors |
| Supply voltage range | 4 V to 5.5 V - compatible with 5-V TTL and mixed-voltage system interfaces |
| Operating temperature | –40°C to +85°C - qualified for industrial-grade embedded and telecom equipment |
| Channel count | Dual 12-bit - allows independent enable/disable of two data buses or combined 24-bit operation |
Pinout & Package
SN74CBTH16211DL is housed in a 56-pin SSOP (Shrink Small Outline Package) with 0.5-mm pitch, 13.9 mm × 7.9 mm body size, and 1.2 mm max height. Thermal resistance θJA is 56°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1A1–1A12, 2A1–2A12 | Input/Output Port A | First and second 12-bit data ports; bidirectional, bus-hold enabled |
| 1B1–1B12, 2B1–2B12 | Input/Output Port B | Corresponding output ports; electrically connected to A-side when OE active |
| 1OE, 2OE | Output Enable | Active-low control per 12-bit channel; high = high-Z isolation |
| VCC | Power supply | Single 4–5.5 V rail powers both switch arrays and bus-hold circuitry |
| GND (Pins 8, 23, 39, 52) | Ground | Four dedicated ground pins minimize switching noise and improve return path integrity |
| NC (Pins 1, 56) | No internal connection | Unbonded pads; must remain unconnected on PCB |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional low-ron switching | 5 Ω typical ensures <0.32 V drop at full 64 mA channel current, preserving signal integrity |
| Integrated bus-hold | Eliminates need for 24 external pull-up/pull-down resistors, reducing BOM count and board area |
| TTL-compatible control inputs | VIL ≤ 0.8 V / VIH ≥ 2 V allows direct interfacing with legacy 5-V logic families |
| Dual independent OE controls | Enables selective gating of two 12-bit data paths without cross-talk or timing skew |
| High-speed propagation | 0.25 ns tpd supports clean edge transmission in high-frequency address/data multiplexing |
Applications
| Memory Interface Isolation | Backplane Signal Routing |
|---|---|
Use Scenario: Isolating DRAM address/data buses during power sequencing or test mode entry in server memory modules. IC Role / Device Role / Timing Role: Bidirectional bus switch enabling/disabling signal paths between controller and memory banks under OE control. Use Value: Prevents contention during hot-plug events and eliminates need for 24 discrete pull resistors, saving 22 mm² PCB area. | Use Scenario: Routing shared control signals (e.g., reset, interrupt) across redundant backplane slots in telecom chassis. IC Role / Device Role / Timing Role: Low-latency signal coupler with bus-hold maintaining valid logic state when slot is unpopulated. Use Value: Ensures deterministic logic levels on unused backplane stubs without external biasing, improving system reliability. |
| Processor Expansion Bus Gating | FPGA I/O Voltage Translation |
Use Scenario: Enabling/disabling peripheral expansion buses (e.g., ISA, LPC) on x86-based industrial controllers. IC Role / Device Role / Timing Role: Dual-channel gate controlling 24-bit parallel bus access based on processor address decode. Use Value: Reduces dynamic power by isolating idle peripherals and prevents leakage through unselected devices. | Use Scenario: Interfacing 5-V legacy peripherals to 3.3-V FPGA I/O banks where level-shifting is required but direction control is static. IC Role / Device Role / Timing Role: Passive voltage-domain bridge using bus-hold to retain last-valid state during FPGA configuration cycles. Use Value: Avoids complex active translators while ensuring glitch-free I/O during partial reconfiguration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar FET bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBT16211DGGR | Same core functionality, TSSOP-56 package (θJA = 64°C/W), no bus-hold circuitry | Requires external pull-up/down resistors on all 24 I/Os; lower thermal performance | Select when bus-hold is unnecessary and TSSOP footprint is preferred |
| SN74LVC16245ADGGR | 3.3-V CMOS transceiver with direction control, not bus-hold, higher drive strength (24 mA) | Unidirectional with DIR pin; incompatible pinout and voltage domain (3.3 V only) | Select for 3.3-V systems requiring active driving, not passive switching |
Compared with SN74CBTH16211DL, SN74CBT16211DGGR lacks bus-hold and has higher thermal resistance, while SN74LVC16245ADGGR requires direction control and operates only at 3.3 V-neither offers pin-compatible replacement nor identical bus-hold functionality.
Availability
SN74CBTH16211DL is available at Aetrix Electronics and suitable for memory interface isolation, backplane signal routing, and processor expansion bus gating requiring stable component supply and industrial-temperature operation.
Supply support for SN74CBTH16211DL 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 SN74CBTH16211DL belongs to TI's 74CBTH logic family, engineered for high-speed, low-distortion bus switching in 5-V systems where signal integrity and reduced external components are critical.
FAQ
What is the maximum continuous current per channel for SN74CBTH16211DL?
The SN74CBTH16211DL supports up to 64 mA continuous current per switch path, with absolute maximum channel current rated at 128 mA. This rating ensures reliable operation under typical 5-V TTL loading conditions without thermal derating in standard airflow environments.
Does SN74CBTH16211DL require external pull-up resistors on its I/O lines?
No, SN74CBTH16211DL does not require external pull-up or pull-down resistors due to its integrated bus-hold circuitry, which actively maintains valid logic states on all A and B port terminals when floating. This feature eliminates 24 discrete resistors in typical implementations.
Can SN74CBTH16211DL operate at 3.3 V supply voltage?
No, SN74CBTH16211DL is specified only for 4 V to 5.5 V operation per its recommended operating conditions. At 3.3 V, the bus-hold circuitry and switch threshold margins fall outside guaranteed specification, risking unreliable logic retention and increased ron.
How is power-up sequencing handled for SN74CBTH16211DL to ensure high-impedance state?
To guarantee high-impedance during power-up, OE pins of SN74CBTH16211DL must be tied to VCC via a pullup resistor; TI specifies minimum resistance based on driver sink capability. This prevents unintended conduction before system control logic initializes.
What is the thermal resistance (θJA) of SN74CBTH16211DL in its SSOP package?
The SN74CBTH16211DL in DL (SSOP-56) package has a junction-to-ambient thermal resistance (θJA) of 56°C/W, measured per JESD 51-7 under standard JEDEC high-efficiency board conditions, supporting sustained operation at full load within industrial temperature limits.
SN74CBTH16211DL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CBTH
- Package/Case:
- 56-BSSOP (0.295", 7.50mm Width)
- Packaging:
- Tube
- 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
SN74CBTH16211DL FAQ
1.How can I place an order for SN74CBTH16211DL through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CBTH16211DL 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 SN74CBTH16211DL reliable?
The price and inventory of SN74CBTH16211DL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBTH16211DL is usually 5 days.
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Once your SN74CBTH16211DL 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 SN74CBTH16211DL?
For technical support, including SN74CBTH16211DL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBTH16211DL requirements.
6.How does Aetrix verify that SN74CBTH16211DL is sourced from the original manufacturer or authorized distributors?
All SN74CBTH16211DL 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 SN74CBTH16211DL meets industry standards.
7.What is the process for return or replacement of SN74CBTH16211DL?
All SN74CBTH16211DL units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBTH16211DL, 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 SN74CBTH16211DL part is unused and in its original packaging.
Return procedure for SN74CBTH16211DL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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