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Texas Instruments SN74CBT16244CDL
- Part No.:
- SN74CBT16244CDL
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 48-BSSOP (0.295", 7.50mm Width)
- Datasheet:
-
SN74CBT16244CDL.pdf
- Description:
- IC BUS SWITCH 4 X 1:1 48SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:219
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Product details
Overview
SN74CBT16244CDL from Texas Instruments is a 16-bit FET bus switch IC organized as four independent 4-bit low-impedance switches, featuring 5-Ω typical on-state resistance, TTL-compatible control inputs, and bidirectional signal routing between port A and port B. It operates from 4 V to 5.5 V over –40°C to 85°C and is used in high-speed data path isolation for memory expansion, address/data bus multiplexing, and hot-swap I/O buffering.
For engineers reviewing the SN74CBT16244CDL datasheet, SN74CBT16244CDL pinout, SN74CBT16244CDL application, or SN74CBT16244CDL equivalent, key selection criteria include on-resistance matching across channels, propagation delay under 0.35 ns at 5 V, OE-controlled bidirectional isolation timing (ten/tdis < 6 ns), and SSOP-48 package compatibility with dense PCB layouts.
Technical Context
The SN74CBT16244CDL implements four independent CMOS transmission-gate-based bus switches, each controlled by a dedicated active-low output-enable (OE) input. Its FET architecture eliminates DC path current and supports true bidirectional signal flow without direction pins.
Each switch exhibits rail-to-rail voltage handling (–0.5 V to 7 V), sub-10 ns enable/disable times, and minimal capacitive loading (Cio(OFF) = 4.5 pF), enabling clean signal integrity in high-frequency digital systems operating up to 100 MHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| On-state resistance (ron) | 5 Ω typical at VCC = 4.5 V, VI = 0 V, II = 30 mA - ensures minimal voltage drop and signal distortion in 3.3 V/5 V logic paths. |
| Propagation delay (tpd) | 0.25 ns typical at VCC = 5 V, CL = 50 pF - enables use in >1 GHz data rate applications with negligible timing skew. |
| Enable time (ten) | 5.1 ns max at VCC = 5 V - guarantees fast channel activation for dynamic bus arbitration and power-gated subsystems. |
| Disable time (tdis) | 5.4 ns max at VCC = 5 V - provides rapid isolation to prevent data contention during state transitions. |
| Supply voltage range | 4 V to 5.5 V - compatible with standard 5 V TTL and mixed-voltage 3.3 V/5 V system interfaces. |
| Input voltage range (VI) | –0.5 V to 7 V - supports fault-tolerant operation and overshoot immunity in noisy industrial environments. |
| Off-state capacitance (Cio) | 4.5 pF - minimizes crosstalk and loading on adjacent high-speed traces in dense interconnects. |
Pinout & Package
SN74CBT16244CDL is housed in a 48-pin SSOP (Shrink Small-Outline Package) with 0.5 mm pitch, 12.6 mm × 6.2 mm body size, and 1.2 mm max height - optimized for space-constrained industrial and telecom PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE, 3OE, 4OE | Active-low output-enable control | Individually enables/disables each 4-bit switch group; low = bidirectional conduction, high = high-Z isolation. |
| 1A1–1A4, 2A1–2A4, 3A1–3A4, 4A1–4A4 | Port A input/output terminals | Bidirectional data terminals for first side of each 4-bit switch; electrically identical to corresponding B pins. |
| 1B1–1B4, 2B1–2B4, 3B1–3B4, 4B1–4B4 | Port B input/output terminals | Bidirectional data terminals for second side of each 4-bit switch; interchangeable with A-side in layout. |
| VCC (Pins 7, 22, 31, 46) | Power supply | Four distributed VCC pins reduce IR drop and improve noise immunity across the 16-bit bus. |
| GND (Pins 4, 13, 26, 35, 44) | Ground reference | Five GND pins provide low-inductance return paths and stabilize switching transients. |
Key Features
| Feature | Design Value |
|---|---|
| 16-bit bidirectional switching | Four independent 4-bit groups allow selective isolation of memory banks, peripheral buses, or I/O lanes without direction control logic. |
| 5-Ω low on-resistance | Reduces insertion loss and maintains signal edge integrity in high-speed parallel interfaces up to 100 MHz. |
| TTL-compatible OE inputs | Accepts standard 0.8 V/2.0 V logic thresholds - directly drivable by legacy microcontrollers and FPGA I/O banks. |
| Zero static power consumption | No DC current flows through enabled switches - eliminates standby power penalty in always-on subsystems. |
| High off-isolation (>50 dB @ 10 MHz) | 4.5 pF off-capacitance and >10⁹ Ω off-resistance suppress crosstalk between active and inactive data paths. |
Applications
| Memory Expansion Interface | Hot-Swappable Peripheral Bus |
|---|---|
|
Use Scenario: Isolating additional SRAM or Flash memory banks from a microcontroller's address/data bus during firmware updates. IC Role / Device Role / Timing Role: Bidirectional bus switch enabling/disabling memory access without altering CPU timing or requiring bus turnaround cycles. Use Value: Prevents data corruption during live reprogramming by electrically disconnecting inactive memory regions while maintaining full 16-bit throughput on active paths. |
Use Scenario: Adding/removing USB or CAN peripherals via backplane connectors without powering down the host controller. IC Role / Device Role / Timing Role: Signal-level isolation device that blocks bus traffic until hot-plug detection and initialization complete. Use Value: Eliminates bus contention and glitch propagation during insertion/removal, supporting true plug-and-play operation in industrial PLCs. |
| Address/Data Multiplexing | Test Access Port Buffering |
|
Use Scenario: Demultiplexing shared address/data lines in legacy 8080-style microprocessor systems. IC Role / Device Role / Timing Role: Transparent pass-through switch activated only during valid address setup or data strobe windows. Use Value: Replaces discrete logic gates and latches with single-cycle, zero-latency path selection - simplifying timing closure and reducing component count. |
Use Scenario: Isolating JTAG or SWD debug interfaces from production circuitry during functional testing. IC Role / Device Role / Timing Role: Controlled isolation barrier that prevents test signals from interfering with operational analog or RF sections. Use Value: Enables concurrent debug access and system validation without redesigning board-level ESD protection or signal conditioning networks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus switching applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBTD16212DLR | 12-bit, higher on-resistance (7 Ω typ), integrated 25-Ω series termination resistors. | Targeted at point-to-point DDR memory trace matching; lacks per-group OE control. | Select when impedance-controlled routing is required and channel count permits reduction. |
| SN74CB3Q3244PAG | 16-bit, lower on-resistance (3.5 Ω typ), 3.3 V only (3.0–3.6 V), TSSOP-48 package. | Optimized for low-voltage SoC interconnects; incompatible with 5 V systems. | Choose for new 3.3 V designs prioritizing lowest possible Ron and reduced power supply complexity. |
Compared with SN74CBT16244CDL, SN74CBTD16212DLR trades per-group control and voltage flexibility for built-in termination, while SN74CB3Q3244PAG delivers lower Ron and tighter voltage tolerance at the cost of 5 V interoperability - making SN74CBT16244CDL optimal for mixed-voltage, high-reliability industrial bus isolation.
Availability
SN74CBT16244CDL is available at Aetrix Electronics and suitable for memory expansion interfaces, hot-swappable peripheral buses, and address/data multiplexing requiring stable component supply across extended temperature ranges and long-lifecycle programs.
Supply support for SN74CBT16244CDL 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 experience in high-reliability interface solutions.
The SN74CBT16244CDL belongs to TI's Widebus™ family of high-speed bus switches, designed specifically for low-latency, bidirectional signal routing in industrial control, telecom infrastructure, and legacy system upgrades.
FAQ
What is the maximum operating temperature range for the SN74CBT16244CDL?
The SN74CBT16244CDL is rated for operation from –40°C to +85°C ambient temperature, meeting industrial-grade thermal requirements. This range is validated per TI's recommended operating conditions and supported by thermal impedance data (θJA = 63°C/W for the DL package), ensuring reliable performance in enclosed enclosures and non-air-conditioned environments where the SN74CBT16244CDL is commonly deployed.
Does the SN74CBT16244CDL support bidirectional signal flow without external direction control?
Yes, the SN74CBT16244CDL supports fully bidirectional signal flow between port A and port B on each 4-bit channel without requiring direction pins or external logic. Its FET-based transmission gate architecture ensures symmetrical electrical characteristics in both directions, and the SN74CBT16244CDL datasheet explicitly confirms data can flow "from port A to port B, or vice versa" when OE is low - eliminating timing asymmetry and simplifying PCB routing.
Can the SN74CBT16244CDL be used in 3.3 V systems?
The SN74CBT16244CDL is not recommended for standalone 3.3 V operation because its minimum specified supply voltage is 4 V per the recommended operating conditions table. While absolute maximum ratings permit VCC as low as –0.5 V, functional operation below 4 V is not guaranteed - using the SN74CBT16244CDL in a 3.3 V system may result in undefined switching behavior or increased on-resistance, so designers should select alternatives like SN74CB3Q3244PAG for native 3.3 V compatibility.
How many independent enable controls does the SN74CBT16244CDL provide?
The SN74CBT16244CDL provides four independent active-low output-enable (OE) inputs - labeled 1OE, 2OE, 3OE, and 4OE - each controlling one 4-bit switch group. This allows granular power and signal domain isolation: for example, disabling only memory-mapped I/O while keeping configuration registers active, or sequencing bus access across multiple peripherals - a capability confirmed in the function table and logic diagram of the SN74CBT16244CDL datasheet.
What is the typical on-state resistance of the SN74CBT16244CDL and how is it measured?
The typical on-state resistance (ron) of the SN74CBT16244CDL is 5 Ω, measured at VCC = 4.5 V, VI = 0 V, and II = 30 mA, per the electrical characteristics table. It is determined by the lower of the voltages at the A or B terminal during conduction, reflecting real-world performance under load - not a small-signal parameter. This value ensures minimal voltage drop (<150 mV at 30 mA) and preserves logic high/low margins in 5 V systems where the SN74CBT16244CDL is most frequently applied.
SN74CBT16244CDL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CBT
- Package/Case:
- 48-BSSOP (0.295", 7.50mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Type:
- Bus Switch
- Circuit:
- 4 x 1:1
- Independent Circuits:
- 4
- 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:
- 48-SSOP
SN74CBT16244CDL FAQ
1.How can I place an order for SN74CBT16244CDL through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CBT16244CDL 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 SN74CBT16244CDL reliable?
The price and inventory of SN74CBT16244CDL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBT16244CDL is usually 5 days.
3.What payment methods are accepted for SN74CBT16244CDL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74CBT16244CDL transactions.
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4.How is shipping managed for SN74CBT16244CDL?
SN74CBT16244CDL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74CBT16244CDL 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 SN74CBT16244CDL?
For technical support, including SN74CBT16244CDL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBT16244CDL requirements.
6.How does Aetrix verify that SN74CBT16244CDL is sourced from the original manufacturer or authorized distributors?
All SN74CBT16244CDL 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 SN74CBT16244CDL meets industry standards.
7.What is the process for return or replacement of SN74CBT16244CDL?
All SN74CBT16244CDL units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBT16244CDL, 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 SN74CBT16244CDL part is unused and in its original packaging.
Return procedure for SN74CBT16244CDL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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