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Texas Instruments SN74CBT3244PWR
- Part No.:
- SN74CBT3244PWR
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74CBT3244PWR.pdf
- Description:
- IC BUS SWITCH 4 X 1:1 20TSSOP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SN74CBT3244PWR 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, 200 MHz bandwidth, and TTL/CMOS-compatible control inputs operating from 4.5 V to 5.5 V. It enables high-speed signal routing between microprocessor buses and peripherals in test equipment and factory automation control boards.
For engineers reviewing the SN74CBT3244PWR datasheet, SN74CBT3244PWR pinout, SN74CBT3244PWR application, or SN74CBT3244PWR equivalent, key selection criteria include its near-zero propagation delay (0.25 ns), 6 pF OFF-state I/O capacitance, bidirectional operation without direction control, and compatibility with 0–5 V signaling levels across mixed-voltage systems.
Technical Context
The SN74CBT3244PWR implements dual 4-bit FET-based analog switches with active-low output-enable (1OE, 2OE) controlling independent A↔B signal paths. Its CMOS/TTL-compatible inputs drive internal transmission gates that exhibit flat on-resistance over voltage and temperature, enabling distortion-free switching of digital waveforms up to 200 MHz.
Each switch channel supports bidirectional signal flow with no inherent directionality-signal integrity depends solely on external source/sink impedance and load capacitance. The device operates within –40°C to +85°C and draws ≤50 µA quiescent current, making it suitable for power-sensitive embedded bus isolation applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| ON-state resistance (ron) | 5 Ω typical - ensures minimal voltage drop and signal attenuation during switching at full rated current. |
| Bandwidth | Up to 200 MHz - supports high-speed parallel bus signals such as address/data lines in legacy microprocessor systems. |
| Propagation delay (tpd) | 0.25 ns typical - enables cycle-accurate timing in synchronous bus architectures with negligible latency impact. |
| I/O capacitance (Cio(OFF)) | 6 pF typical - reduces capacitive loading on driving sources and preserves edge rates in high-frequency traces. |
| Supply voltage range (VCC) | 4.5 V to 5.5 V - compatible with standard 5-V TTL logic rails while tolerating supply variation without functional degradation. |
| Input voltage range | 0 V to 5 V - allows interfacing with mixed-voltage logic families (1.8 V, 2.5 V, 3.3 V, 5 V) without level shifters. |
| Quiescent current (ICC) | 50 µA maximum - minimizes standby power draw in always-on bus isolation or hot-swap enable circuits. |
Pinout & Package
TSSOP-20 package (PW), 5.00 mm × 4.40 mm body, 1.2 mm max height, 0.65 mm lead pitch, exposed pad not present. Pin 1 index located at top-left corner with beveled edge marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | 1OE | Active-low enable for first 4-bit switch group (1A1–1A4 ↔ 1B1–1B4); high = high-Z isolation. |
| 2 | 1A1 | Bidirectional I/O terminal for Channel 1 of Group 1; connects to 1B1 when 1OE = low. |
| 3 | 2B4 | Bidirectional I/O terminal for Channel 4 of Group 2; connects to 2A4 when 2OE = low. |
| 4 | 1A2 | Bidirectional I/O terminal for Channel 2 of Group 1; connects to 1B2 when 1OE = low. |
| 5 | 2B3 | Bidirectional I/O terminal for Channel 3 of Group 2; connects to 2A3 when 2OE = low. |
| 6 | 1A3 | Bidirectional I/O terminal for Channel 3 of Group 1; connects to 1B3 when 1OE = low. |
| 7 | 2B2 | Bidirectional I/O terminal for Channel 2 of Group 2; connects to 2A2 when 2OE = low. |
| 8 | 1A4 | Bidirectional I/O terminal for Channel 4 of Group 1; connects to 1B4 when 1OE = low. |
| 9 | 2B1 | Bidirectional I/O terminal for Channel 1 of Group 2; connects to 2A1 when 2OE = low. |
| 10 | GND | Ground reference for all internal circuitry and I/O return path. |
| 11 | 2A1 | Bidirectional I/O terminal for Channel 1 of Group 2; connects to 2B1 when 2OE = low. |
| 12 | 1B4 | Bidirectional I/O terminal for Channel 4 of Group 1; connects to 1A4 when 1OE = low. |
| 13 | 2A2 | Bidirectional I/O terminal for Channel 2 of Group 2; connects to 2B2 when 2OE = low. |
| 14 | 1B3 | Bidirectional I/O terminal for Channel 3 of Group 1; connects to 1A3 when 1OE = low. |
| 15 | 2A3 | Bidirectional I/O terminal for Channel 3 of Group 2; connects to 2B3 when 2OE = low. |
| 16 | 1B2 | Bidirectional I/O terminal for Channel 2 of Group 1; connects to 1A2 when 1OE = low. |
| 17 | 2A4 | Bidirectional I/O terminal for Channel 4 of Group 2; connects to 2B4 when 2OE = low. |
| 18 | 1B1 | Bidirectional I/O terminal for Channel 1 of Group 1; connects to 1A1 when 1OE = low. |
| 19 | 2OE | Active-low enable for second 4-bit switch group (2A1–2A4 ↔ 2B1–2B4); high = high-Z isolation. |
| 20 | VCC | Positive supply rail (4.5–5.5 V); powers internal gate drivers and switch bias networks. |
Key Features
| Feature | Design Value |
|---|---|
| High-bandwidth data path | 200 MHz operation enables use in fast parallel bus applications without signal degradation. |
| Bidirectional zero-delay switching | No direction control required; signal flows equally well A→B or B→A with <0.25 ns propagation delay. |
| Low and flat ON-state resistance | 5 Ω typical, stable across voltage and temperature - maintains consistent signal amplitude and timing. |
| Low input/output capacitance | 6 pF OFF-state I/O capacitance minimizes trace loading and preserves rise/fall times in high-speed layouts. |
| Mixed-voltage interface support | 0–5 V signaling tolerance allows direct connection to 1.8 V, 2.5 V, 3.3 V, and 5 V logic without level translation. |
Applications
| Multi-Processor Communications | Test and Measurement Systems |
|---|---|
|
Use Scenario: Isolating shared address/data buses between two microprocessors during concurrent memory access. IC Role / Device Role / Timing Role: Bidirectional bus switch providing dynamic, low-latency path selection between CPU and peripheral memory banks. Use Value: Eliminates need for tristate buffers and direction-control logic, reducing PCB area and timing complexity while maintaining 200 MHz throughput. |
Use Scenario: Routing DUT signals to multiple instrument channels (oscilloscope, logic analyzer, pattern generator) in automated test fixtures. IC Role / Device Role / Timing Role: High-fidelity signal path selector with minimal added capacitance or resistance to preserve waveform fidelity. Use Value: Enables reconfigurable test setups without mechanical relays; 6 pF Cio(OFF) prevents crosstalk and loading-induced measurement error. |
| Factory Automation Control Boards | Building Automation Control Boards |
|
Use Scenario: Switching sensor data streams (e.g., thermocouple, encoder, IO-Link) between PLC master and field devices during diagnostics or firmware updates. IC Role / Device Role / Timing Role: Fault-isolated bus interface managing hot-swap-capable I/O expansion modules. Use Value: 50 µA ICC and robust ESD rating (±1500 V HBM) ensure reliable operation in electrically noisy industrial environments. |
Use Scenario: Enabling/disabling communication paths between HVAC controllers, lighting nodes, and BACnet/IP gateways in centralized building management systems. IC Role / Device Role / Timing Role: Low-power bus isolation device supporting intermittent polling and event-driven messaging protocols. Use Value: Supports energy-efficient operation with sub-100 µA standby current and compatibility with 3.3 V controller I/O domains. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBTD3384PWR | 10-bit configuration with 3.3 V only VCC (3.0–3.6 V), higher ron (7 Ω typ), same TSSOP-24 package. | Designed for 3.3 V-only systems; lacks 5 V tolerance and mixed-voltage flexibility of SN74CBT3244PWR. | Select when migrating to 3.3 V infrastructure and requiring additional channel count; verify voltage compatibility. |
| SN74LVC1G3157DCKR | Single-pole double-throw (SPDT) analog switch, 5 V tolerant, 10 Ω ron, SC70-6 package. | Not pin-compatible; intended for discrete signal routing rather than parallel bus switching. | Use for low-channel-count, space-constrained designs where octal switching is unnecessary and layout density is critical. |
Compared with SN74CBT3244PWR, SN74CBTD3384PWR offers more bits but sacrifices 5 V operation and mixed-voltage signaling, while SN74LVC1G3157DCKR provides compact SPDT routing at the cost of parallel bus capability and channel count-making SN74CBT3244PWR optimal for legacy 5 V bus isolation with minimal latency and loading.
Availability
SN74CBT3244PWR is available at Aetrix Electronics and suitable for multi-processor communications, test and measurement systems, and factory automation control boards requiring stable component supply and long-term industrial lifecycle support.
Supply support for SN74CBT3244PWR 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 company specializing in analog and embedded processing technologies, with leadership in signal integrity, power management, and industrial-grade ICs.
The SN74CBT3244PWR belongs to TI's CBT (Crossbar Bus Transceiver) family, designed specifically for high-speed, low-distortion bus switching in industrial control, instrumentation, and legacy computing interfaces.
FAQ
What is the maximum operating frequency supported by the SN74CBT3244PWR?
The SN74CBT3244PWR supports signal switching up to 200 MHz, as confirmed by its high-bandwidth data path specification and 0.25 ns typical propagation delay. This performance is achievable under recommended conditions: 5 V supply, 50 pF load, and proper PCB layout with minimized trace inductance and capacitance. Frequency capability may decrease with higher load capacitance or series resistance.
Is the SN74CBT3244PWR compatible with 3.3 V logic inputs?
Yes, the SN74CBT3244PWR accepts 3.3 V logic inputs directly. Its control inputs are TTL/CMOS-compatible and specified to recognize VIH ≥ 2 V and VIL ≤ 0.8 V, fully covering 3.3 V logic thresholds. Additionally, its I/O pins tolerate 0–5 V signaling regardless of VCC, enabling seamless interfacing with 3.3 V devices on a 5 V bus.
Does the SN74CBT3244PWR require external pull-up resistors on 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 using a resistor value determined by the driver's current-sinking capability-typically 10 kΩ suffices for most microcontroller GPIO outputs. Leaving OE floating risks unintended switching or bus contention.
Can the SN74CBT3244PWR be used in bidirectional USB or I²C signal routing?
No, the SN74CBT3244PWR is not suitable for USB or I²C routing. While bidirectional, it lacks the specific voltage-level translation, slew-rate control, and open-drain compatibility required by those protocols. Its 5 Ω ron and 6 pF Cio(OFF) are optimized for 5 V parallel buses-not low-voltage, multi-master, or protocol-aware serial interfaces.
What is the thermal resistance (RθJA) of the SN74CBT3244PWR in its TSSOP package?
The SN74CBT3244PWR in TSSOP-20 (PW) package has a junction-to-ambient thermal resistance (RθJA) of 83 °C/W, as specified in TI's thermal metrics documentation. This value assumes standard JEDEC 2-layer board conditions; actual performance improves with added copper pour, thermal vias, or airflow, and degrades in compact, multi-layer, or enclosed assemblies.
SN74CBT3244PWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CBT
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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-TSSOP
SN74CBT3244PWR FAQ
1.How can I place an order for SN74CBT3244PWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CBT3244PWR 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 SN74CBT3244PWR reliable?
The price and inventory of SN74CBT3244PWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBT3244PWR is usually 5 days.
3.What payment methods are accepted for SN74CBT3244PWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74CBT3244PWR transactions.
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4.How is shipping managed for SN74CBT3244PWR?
SN74CBT3244PWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74CBT3244PWR 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 SN74CBT3244PWR?
For technical support, including SN74CBT3244PWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBT3244PWR requirements.
6.How does Aetrix verify that SN74CBT3244PWR is sourced from the original manufacturer or authorized distributors?
All SN74CBT3244PWR 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 SN74CBT3244PWR meets industry standards.
7.What is the process for return or replacement of SN74CBT3244PWR?
All SN74CBT3244PWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBT3244PWR, 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 SN74CBT3244PWR part is unused and in its original packaging.
Return procedure for SN74CBT3244PWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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