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Texas Instruments SN74CBT3244DWR
- Part No.:
- SN74CBT3244DWR
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74CBT3244DWR.pdf
- Description:
- IC BUS SWITCH 4 X 1:1 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,900
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Product details
Overview
SN74CBT3244DWR from Texas Instruments is an octal FET bus switch organized as two independent 4-bit bidirectional low-impedance switches, featuring 5 Ω typical ON-state resistance, 6 pF typical OFF-state I/O capacitance, and 0.25 ns typical propagation delay - enabling high-speed signal routing in microprocessor-peripheral interconnects.
For engineers reviewing the SN74CBT3244DWR datasheet, SN74CBT3244DWR pinout, SN74CBT3244DWR application, or SN74CBT3244DWR equivalent, key selection criteria include TTL/CMOS-compatible control inputs, 4.5 V to 5.5 V VCC operation, 0–5 V data-level tolerance, bidirectional zero-delay switching, and SOIC-20 package compatibility with standard '244 pinout.
Technical Context
The SN74CBT3244DWR implements dual 4-bit FET-based analog switches with active-low output-enable (1OE, 2OE) controlling independent A↔B signal paths. Each switch channel supports bidirectional signal flow with near-zero propagation delay and flat on-resistance over temperature.
Its architecture relies on voltage-controlled MOSFET pass gates rather than logic-gated buffers, allowing DC-coupled, rail-to-rail signal transmission across 0 V to 5 V while maintaining low capacitive loading (Cio(OFF) = 6 pF) and minimal distortion - critical for high-fidelity digital bus isolation and multiplexing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - ensures compatibility with 5-V TTL and mixed-voltage systems without level-shifting. |
| ron (Typical) | 5 Ω - enables minimal voltage drop and signal attenuation at up to 64 mA per channel. |
| Cio(OFF) | 6 pF - reduces capacitive loading on driven buses, preserving signal integrity up to 200 MHz. |
| tpd (Typical) | 0.25 ns - delivers near-instantaneous bidirectional signal transfer with no added timing skew. |
| VI/O Range | 0 V to 5 V - supports interoperability with 0.8 V, 1.2 V, 1.5 V, 1.8 V, 2.5 V, 3.3 V, and 5 V logic families. |
| ICC (Max) | 50 µA - ensures negligible quiescent power draw during standby or high-impedance states. |
| ESD Rating (HBM) | ±1500 V - provides robust handling margin during board assembly and system integration. |
Pinout & Package
SN74CBT3244DWR is housed in a 20-pin SOIC (DW) package measuring 9.97 mm × 12.60 mm, with standard '244 pinout and gull-wing leads compatible with automated SMT placement and reflow.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE | Active-low enable for Group 1 (1A1–1A4 ↔ 1B1–1B4) | Drives Group 1 into high-impedance state when high; ties A/B ports together when low. |
| 2OE | Active-low enable for Group 2 (2A1–2A4 ↔ 2B1–2B4) | Independent control allows selective routing of two 4-bit buses without crosstalk. |
| 1A1–1A4, 2A1–2A4 | Group input/output terminals (Side A) | Bidirectional I/O pins - function identically as inputs or outputs depending on signal direction. |
| 1B1–1B4, 2B1–2B4 | Group input/output terminals (Side B) | Electrically identical to A-side; no internal directionality - signal path determined by external circuitry. |
| VCC | Positive supply | Single 4.5–5.5 V rail powers all eight switches and control logic; bypass capacitor required. |
| GND | Ground reference | Common return path for all channels and control signals; must be low-impedance for noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional zero-delay switching | 0.25 ns tpd enables transparent signal coupling between processors and peripherals without timing budget impact. |
| Low and flat ON-state resistance | 5 Ω typical ron with <±2 Ω variation over –40°C to +85°C ensures consistent signal amplitude across temperature. |
| TTL/CMOS-compatible control inputs | VIH = 2 V min, VIL = 0.8 V max allows direct drive from legacy 5-V TTL or modern 3.3-V CMOS controllers. |
| 0–5 V data-level tolerance | Supports mixed-voltage domains - e.g., 1.8 V FPGA I/O driving 5 V ADC inputs - without external level shifters. |
| Low OFF-state capacitance | 6 pF Cio(OFF) minimizes capacitive loading on inactive buses, preserving rise/fall times and reducing crosstalk. |
Applications
| Multi-Processor Communications | Test and Measurement Systems |
|---|---|
Use Scenario: Isolating shared address/data buses between two microcontrollers during concurrent firmware updates. IC Role / Device Role / Timing Role: Bidirectional bus switch enabling time-multiplexed access while preventing contention and latch-up. Use Value: Eliminates need for directional transceivers or complex arbitration logic; preserves signal fidelity at >100 MHz clock rates. |
Use Scenario: Routing DUT signals between multiple instrument channels (e.g., oscilloscope, logic analyzer, pattern generator). IC Role / Device Role / Timing Role: Low-capacitance signal path selector that avoids adding jitter or skew to high-speed digital waveforms. Use Value: Maintains sub-nanosecond edge integrity and enables repeatable, low-noise measurements across test configurations. |
| Factory Automation Control Boards | Building Automation Control Boards |
Use Scenario: Switching PLC I/O lines between redundant CPU modules during failover events. IC Role / Device Role / Timing Role: Fail-safe bus isolator with fast enable/disable (ten = 1 ns, tdis = 1 ns) ensuring glitch-free handover. Use Value: Prevents bus contention during switchover; supports hot-swap capability without system reset. |
Use Scenario: Sharing sensor data buses (e.g., RS-485, CAN, or analog inputs) among HVAC, lighting, and security subsystems. IC Role / Device Role / Timing Role: Voltage-tolerant analog/digital multiplexer enabling mixed-voltage sensor interfacing without level translation. Use Value: Reduces BOM count by consolidating interface logic; accommodates legacy 5 V sensors alongside 3.3 V MCU hosts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus switching applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBTD3384DWR | Includes integrated 5-V tolerant level shifters; higher ron (7 Ω typ); supports 3.3 V/5 V domain bridging. | Required when connecting 3.3 V logic to 5 V peripherals with automatic voltage translation. | Select when bidirectional level shifting is needed; not drop-in due to different control logic and higher capacitance. |
| SN74LVC1G3157DCKR | Single-channel SPDT switch; 3.3 V only VCC; lower ron (5.5 Ω); smaller SC70-6 package. | Suitable for point-to-point signal routing where density or single-line isolation is prioritized over octal grouping. | Choose for space-constrained designs needing discrete channel control; not scalable to 8-bit bus applications. |
Compared with SN74CBT3244DWR, SN74CBTD3384DWR adds level-shifting but increases propagation delay and layout complexity, while SN74LVC1G3157DCKR offers miniaturization at the cost of channel count and bus-oriented functionality - making SN74CBT3244DWR optimal for compact, high-fidelity 8-bit bus isolation.
Availability
SN74CBT3244DWR is available at Aetrix Electronics and suitable for multi-processor communications, test instrumentation, and factory automation control boards requiring stable component supply and long-term industrial lifecycle support.
Supply support for SN74CBT3244DWR 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 50 years of innovation in industrial-grade IC design.
The SN74CBT3244DWR belongs to TI's CBT (Crosspoint Bus Transceiver) family, engineered specifically for high-speed, low-distortion digital bus switching in real-time control and instrumentation systems.
FAQ
What is the maximum operating frequency supported by the SN74CBT3244DWR?
The SN74CBT3244DWR supports signal switching up to 200 MHz, enabled by its 5 Ω typical ON-state resistance and 6 pF OFF-state capacitance - characteristics validated under recommended operating conditions (VCC = 4.5 V to 5.5 V, TA = –40°C to +85°C). Performance remains stable across this range when PCB layout follows TI's guidelines for controlled impedance and minimal trace capacitance.
Does the SN74CBT3244DWR require external pull-up resistors on its OE pins?
Yes - to ensure defined high-impedance state during power-up or power-down, both 1OE and 2OE pins should be tied to VCC via pull-up resistors. TI recommends values based on driver sink capability; typical values range from 4.7 kΩ to 10 kΩ. Leaving OE floating may cause unintended bus connection and signal contention.
Can the SN74CBT3244DWR interface between 3.3 V and 5 V logic domains?
Yes - the SN74CBT3244DWR supports 0–5 V signaling on all I/O pins (1A1–1B4, 2A1–2B4), allowing seamless bidirectional communication between 3.3 V and 5 V devices without external level shifters. Its control inputs (1OE, 2OE) are TTL/CMOS-compatible and accept 2 V VIH minimum, ensuring reliable activation from either domain.
What is the thermal performance of the SN74CBT3244DWR in SOIC-20 package?
The SN74CBT3244DWR in SOIC-20 (DW) package has a junction-to-ambient thermal resistance (RθJA) of 70°C/W. Under typical operating conditions (VCC = 5 V, all channels active at 30 mA), power dissipation remains below 100 mW, resulting in negligible temperature rise - eliminating need for heatsinking in standard industrial environments.
Is the SN74CBT3244DWR pin-compatible with other '244-form factor devices?
Yes - the SN74CBT3244DWR uses the industry-standard '244 pinout across all package variants, including SOIC-20 (DW). This allows direct replacement of legacy 74LS244 or 74HC244 buffers in existing layouts, though functional differences (e.g., bidirectional switching vs. unidirectional buffering) require verification of signal flow and OE logic polarity in the target design.
SN74CBT3244DWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CBT
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Bus Switch
- Circuit:
- 4 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:
- 20-SOIC
SN74CBT3244DWR FAQ
1.How can I place an order for SN74CBT3244DWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CBT3244DWR 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 SN74CBT3244DWR reliable?
The price and inventory of SN74CBT3244DWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBT3244DWR is usually 5 days.
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Once your SN74CBT3244DWR 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 SN74CBT3244DWR?
For technical support, including SN74CBT3244DWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBT3244DWR requirements.
6.How does Aetrix verify that SN74CBT3244DWR is sourced from the original manufacturer or authorized distributors?
All SN74CBT3244DWR 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 SN74CBT3244DWR meets industry standards.
7.What is the process for return or replacement of SN74CBT3244DWR?
All SN74CBT3244DWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBT3244DWR, 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 SN74CBT3244DWR part is unused and in its original packaging.
Return procedure for SN74CBT3244DWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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