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Texas Instruments SN74CBT3244PW
- Part No.:
- SN74CBT3244PW
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74CBT3244PW.pdf
- Description:
- IC BUS SWITCH 4 X 1:1 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:798
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Product details
Overview
SN74CBT3244PW 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 TTL-compatible signal routing in microprocessor-peripheral interconnects.
For engineers reviewing the SN74CBT3244PW datasheet, SN74CBT3244PW pinout, SN74CBT3244PW application, or SN74CBT3244PW equivalent, key selection criteria include its active-low dual OE control, 4.5 V to 5.5 V VCC operation, 0–5 V data-level tolerance, and TSSOP-20 package compatibility with standard '244 pinout for drop-in replacement in legacy bus architectures.
Technical Context
The SN74CBT3244PW implements eight independent FET-based transmission gates grouped into two 4-bit channels (1A/1B and 2A/2B), each controlled by a dedicated active-low output-enable input (1OE, 2OE). Its CMOS/TTL-compatible control inputs accept logic thresholds of VIH ≥ 2 V and VIL ≤ 0.8 V across –40°C to 85°C.
Each channel supports bidirectional signal flow with near-zero propagation delay (0.25 ns typical) and flat ON-resistance (5 Ω typical at VCC = 4.5 V, 30 mA), while maintaining low dynamic loading via 6 pF typical OFF-state I/O capacitance and 50 µA maximum ICC quiescent current.
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 using 3.3-V controllers |
| ron (Typical) | 5 Ω - minimizes voltage drop and timing skew for high-speed digital signals up to 200 MHz |
| Cio(OFF) (Typical) | 6 pF - reduces capacitive loading on driven buses, preserving signal integrity and edge rate |
| tpd (Typical) | 0.25 ns - enables sub-nanosecond signal pass-through with negligible added latency |
| VI/O Range | 0 V to 5 V - supports level-shifting between 1.2 V, 1.5 V, 1.8 V, 2.5 V, 3.3 V, and 5 V logic domains |
| ICC (Max) | 50 µA - allows integration into low-power systems without significant supply current penalty |
| Operating Temp | –40°C to +85°C - qualified for industrial-grade embedded control and automation environments |
Pinout & Package
TSSOP-20 package (5.00 mm × 4.40 mm, 1.2 mm max height), JEDEC MO-153 compliant, with exposed pad not electrically connected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | 1OE | Active-low enable for first 4-bit switch (1A1–1A4 ↔ 1B1–1B4); high = high-Z isolation |
| 2 | 1A1 | Bidirectional I/O port A, channel 1, bit 1 - connects to B1 when 1OE is low |
| 4 | 1A2 | Bidirectional I/O port A, channel 1, bit 2 - supports 0–5 V signaling regardless of VCC |
| 6 | 1A3 | Bidirectional I/O port A, channel 1, bit 3 - shares same low-impedance path and timing as other 1A pins |
| 8 | 1A4 | Bidirectional I/O port A, channel 1, bit 4 - electrically identical to 1A1–1A3 in ron and Cio |
| 18 | 1B1 | Bidirectional I/O port B, channel 1, bit 1 - mirror of 1A1; fully symmetric signal path |
| 16 | 1B2 | Bidirectional I/O port B, channel 1, bit 2 - no directionality bias; signal flows A→B or B→A identically |
| 14 | 1B3 | Bidirectional I/O port B, channel 1, bit 3 - maintains <5 Ω ron and <6 pF Cio across full temp range |
| 12 | 1B4 | Bidirectional I/O port B, channel 1, bit 4 - shares common 1OE control and VCC/GND rails |
| 19 | 2OE | Active-low enable for second 4-bit switch (2A1–2A4 ↔ 2B1–2B4); independent of 1OE |
| 11 | 2A1 | Bidirectional I/O port A, channel 2, bit 1 - isolated from channel 1 except via shared power/ground |
| 13 | 2A2 | Bidirectional I/O port A, channel 2, bit 2 - supports same voltage levels and timing as 2A1 |
| 15 | 2A3 | Bidirectional I/O port A, channel 2, bit 3 - enables independent gating of two 4-bit data paths |
| 17 | 2A4 | Bidirectional I/O port A, channel 2, bit 4 - allows simultaneous or staggered enable of both channels |
| 9 | 2B1 | Bidirectional I/O port B, channel 2, bit 1 - completes second independent 4-bit transceiver path |
| 7 | 2B2 | Bidirectional I/O port B, channel 2, bit 2 - matches 2B1 electrical characteristics exactly |
| 5 | 2B3 | Bidirectional I/O port B, channel 2, bit 3 - supports same 200 MHz bandwidth as all other channels |
| 3 | 2B4 | Bidirectional I/O port B, channel 2, bit 4 - completes pinout symmetry with standard '244 layout |
| 10 | GND | Digital ground reference - must be low-impedance connection to minimize noise coupling |
| 20 | VCC | Positive supply rail - requires 0.1 µF bypass capacitor placed adjacent to pin per TI layout guidance |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional signal routing | Zero-directionality bias: identical ron, tpd, and Cio for A→B and B→A paths within each channel |
| Level-agnostic I/O | Supports 0–5 V signaling independent of VCC - enables safe interfacing between disparate logic families |
| Standard '244 pinout | Direct PCB footprint compatibility with legacy 74LS244/74ACT244, simplifying upgrade paths |
| Low dynamic loading | 6 pF Cio(OFF) minimizes capacitive stub effects on high-speed buses, preserving rise/fall times |
| Independent dual-channel control | Separate 1OE and 2OE inputs allow selective gating of two 4-bit data streams without cross-talk |
Applications
| Multi-Processor Communications | Test and Measurement Systems |
|---|---|
|
Use Scenario: Isolating shared address/data buses between two microprocessors during concurrent memory access or debug operations. IC Role / Device Role / Timing Role: Bidirectional bus switch providing sub-nanosecond-latency, low-skew signal pass-through with independent channel enable control. Use Value: Prevents bus contention while maintaining full 200 MHz bandwidth and eliminating level-shifter overhead. |
Use Scenario: Routing high-speed digital stimulus or response signals between FPGA-based pattern generators and DUTs in automated test equipment. IC Role / Device Role / Timing Role: Low-capacitance, low-ron analog-like switch enabling clean signal injection and capture without added jitter or distortion. Use Value: Preserves signal fidelity up to 200 MHz with <6 pF OFF-state capacitance and <5 Ω ON-resistance. |
| Factory Automation Control Boards | Building Automation Control Boards |
|
Use Scenario: Selectively connecting sensor interface ICs (e.g., ADCs, temperature sensors) to a central microcontroller over a shared SPI or parallel bus. IC Role / Device Role / Timing Role: Channel-isolated bus gate managing multiple peripheral connections with minimal propagation delay and no direction control logic. Use Value: Reduces board space vs discrete MOSFET solutions while supporting industrial −40°C to +85°C operating range. |
Use Scenario: Enabling flexible wiring topologies in HVAC or lighting control panels where field devices may operate at different logic voltages (3.3 V, 5 V). IC Role / Device Role / Timing Role: Voltage-tolerant bidirectional switch allowing seamless interconnection between mixed-voltage subsystems. Use Value: Eliminates need for external level shifters while maintaining <0.25 ns tpd for real-time control loop responsiveness. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus switching applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBTD3384PWR | 10-bit configuration with 3-state outputs; higher ron (7 Ω typical) and Cio (8 pF typical); supports 3.3-V-only VCC | Designed for wider data buses and 3.3-V systems; lacks 5-V tolerance and dual independent OE control | Select when expanding to 10-bit paths or operating exclusively at 3.3 V with need for 3-state output capability |
| 74LVC244APW | Non-bidirectional buffer with direction control; higher tpd (3.4 ns typical); no level-agnostic I/O - limited to 3.3-V signaling | Requires explicit direction pin management; unsuitable for true bidirectional bus sharing or mixed-voltage interfaces | Choose only for unidirectional buffering where direction is fixed and voltage domain is strictly 3.3 V |
Compared with SN74CBT3244PW, SN74CBTD3384PWR offers more bits but sacrifices voltage flexibility and dual-OE independence, while 74LVC244APW lacks bidirectionality and level tolerance - making SN74CBT3244PW uniquely suited for high-speed, mixed-voltage, independently gated 8-bit bus switching.
Availability
SN74CBT3244PW 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 industrial temperature support.
Supply support for SN74CBT3244PW 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 delivering analog and embedded processing solutions, with over 90 years of innovation in precision analog, power management, and logic devices.
The SN74CBT3244PW belongs to TI's CBT (Crosspoint Bus Transceiver) logic family, engineered specifically for high-bandwidth, low-latency, bidirectional bus switching in industrial and instrumentation applications.
FAQ
What is the function of the 1OE and 2OE pins on the SN74CBT3244PW?
The 1OE and 2OE pins are active-low output-enable inputs controlling two independent 4-bit switch channels. When pulled low, each enables bidirectional signal conduction between its respective A and B ports (e.g., 1OE low connects 1A1–1A4 to 1B1–1B4). When high, the corresponding channel enters high-impedance isolation. This dual-OE architecture allows selective gating of two data paths without interaction - a core design feature of the SN74CBT3244PW.
Does the SN74CBT3244PW support level shifting between different logic voltages?
Yes, the SN74CBT3244PW supports 0 V to 5 V signaling on all I/O pins regardless of VCC (4.5 V to 5.5 V), enabling interoperability between 1.2 V, 1.5 V, 1.8 V, 2.5 V, 3.3 V, and 5 V logic domains. This level-agnostic behavior is intrinsic to its FET-switch architecture and is explicitly specified in the datasheet - a defining capability of the SN74CBT3244PW.
What is the maximum operating frequency supported by the SN74CBT3244PW?
The SN74CBT3244PW 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 (VCC = 4.5–5.5 V, CL ≤ 50 pF, proper PCB layout), and is a rated characteristic of the SN74CBT3244PW - not a theoretical limit.
Is a bypass capacitor required for the SN74CBT3244PW, and if so, what value?
Yes, TI specifies a 0.1 µF ceramic bypass capacitor between VCC (pin 20) and GND (pin 10) placed as close as possible to the SN74CBT3244PW. This is mandatory for stable operation and noise suppression, per Section 9.2.1 and Section 10 of the official datasheet - a critical implementation requirement for every SN74CBT3244PW deployment.
What package type and dimensions does the SN74CBT3244PW use?
The SN74CBT3244PW uses a TSSOP-20 package (JEDEC MO-153), with nominal body dimensions of 5.00 mm × 4.40 mm and maximum height of 1.2 mm. Pin pitch is 0.65 mm, and it features a standard '244 pinout compatible with legacy layouts - all verified in TI's mechanical drawings (PW0020A) and orderable addendum for the SN74CBT3244PW.
SN74CBT3244PW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CBT
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Bulk
- 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-TSSOP
SN74CBT3244PW FAQ
1.How can I place an order for SN74CBT3244PW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CBT3244PW 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 SN74CBT3244PW reliable?
The price and inventory of SN74CBT3244PW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBT3244PW is usually 5 days.
3.What payment methods are accepted for SN74CBT3244PW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74CBT3244PW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74CBT3244PW?
SN74CBT3244PW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74CBT3244PW 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 SN74CBT3244PW?
For technical support, including SN74CBT3244PW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBT3244PW requirements.
6.How does Aetrix verify that SN74CBT3244PW is sourced from the original manufacturer or authorized distributors?
All SN74CBT3244PW 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 SN74CBT3244PW meets industry standards.
7.What is the process for return or replacement of SN74CBT3244PW?
All SN74CBT3244PW units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBT3244PW, 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 SN74CBT3244PW part is unused and in its original packaging.
Return procedure for SN74CBT3244PW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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