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Texas Instruments SN74CBT3244CPW
- Part No.:
- SN74CBT3244CPW
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74CBT3244CPW.pdf
- Description:
- IC BUS SWITCH 4 X 1:1 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:514
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Product details
Overview
SN74CBT3244CPW from Texas Instruments is a high-speed TTL-compatible 8-bit FET bus switch organized as two independent 4-bit bidirectional switches, featuring 3 Ω typical ON-state resistance, near-zero propagation delay (0.15 ns at 5 V), and undershoot protection up to −2 V on A/B ports. It operates from 4 V to 5.5 V and supports mixed-voltage signaling (0.8 V to 5 V) in USB interface and memory interleaving applications.
For engineers reviewing the SN74CBT3244CPW datasheet, SN74CBT3244CPW pinout, SN74CBT3244CPW application, or SN74CBT3244CPW equivalent, key selection criteria include Ioff partial-power-down support, 5.5 pF typical OFF-state I/O capacitance, ±128 mA switch current rating, and TSSOP-20 package compatibility with space-constrained board layouts.
Technical Context
The SN74CBT3244CPW implements dual 4-bit FET-based analog/digital bus switches with independent OE control (1OE, 2OE), enabling configurable 4-bit or consolidated 8-bit operation. Each switch channel provides bidirectional signal flow with no direction pin required.
Its active undershoot-protection circuitry monitors A/B port voltages and forces OFF-state isolation when undershoot events below −2 V occur. The device fully supports partial-power-down via Ioff, preventing backflow current when VCC = 0 V while maintaining high-impedance isolation between ports.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4 V to 5.5 V - Ensures compatibility with 5-V TTL and mixed-voltage systems including 3.3-V/5-V level translation. |
| ron (Typ) | 3 Ω - Minimizes voltage drop and power loss during signal pass-through; enables <10 mV drop at 30 mA load. |
| tpd (Max) | 0.24 ns at 4 V - Near-zero propagation delay preserves signal integrity in high-speed data gating and bus isolation. |
| Cio(OFF) (Typ) | 5.5 pF - Low OFF-capacitance reduces crosstalk and loading on adjacent traces in dense PCB routing. |
| Ioff (Max) | 10 µA at VCC = 0 V - Guarantees robust isolation during system power sequencing or partial shutdown. |
| VIKU (Min) | −2 V - Undershoot protection threshold ensures safe operation during transient negative excursions on data lines. |
| II/O (Max) | ±128 mA - Supports driving moderate capacitive loads or short-duration peak currents without latch-up. |
Pinout & Package
TSSOP-20 (PW) package: 6.5 mm × 4.4 mm, 1.2 mm max height, 0.65 mm lead pitch, surface-mount, RoHS-compliant NIPDAU finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE | Output-enable inputs (active-low) | Independent control of each 4-bit switch section; low = ON (A↔B connected), high = OFF (high-Z isolation). |
| 1A1–1A4, 2A1–2A4 | Port A data terminals (section 1 & 2) | Input/output nodes for first and second 4-bit switch banks; bidirectional, voltage-tolerant (0–5.5 V). |
| 1B1–1B4, 2B1–2B4 | Port B data terminals (section 1 & 2) | Paired bidirectional I/Os mirroring A-side; identical electrical characteristics and undershoot protection. |
| VCC | Power supply | Single 4–5.5 V rail powers internal logic and switch FETs; must be stable before applying signals. |
| GND | Ground reference | Common return path for all signals and supply; requires low-inductance connection to minimize noise coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional switching | No direction control needed - A and B ports are functionally identical and interchangeable in signal flow. |
| Undershoot protection | Active circuitry clamps A/B ports to safe state during −2 V transients, preventing false turn-on or damage. |
| Ioff partial-power-down | Enables hot-plug or power-gated subsystems by blocking current flow when VCC = 0 V, avoiding backfeeding. |
| Mixed-voltage I/O support | 0–5.5 V data signaling range allows interfacing between 0.8-V, 1.2-V, 1.5-V, 1.8-V, 2.5-V, 3.3-V, and 5-V logic domains. |
| Low ICC | 3 µA max supply current - negligible quiescent power draw ideal for battery-backed or always-on monitoring paths. |
Applications
| USB Interface | Memory Interleaving |
|---|---|
Use Scenario: Isolating USB D+ and D− lines during host controller reset or peripheral enumeration. IC Role / Device Role / Timing Role: Bidirectional signal gate controlling physical layer connectivity without introducing timing skew. Use Value: 0.15 ns propagation delay and 5.5 pF OFF-capacitance preserve USB 2.0 full-speed signal integrity and meet eye-diagram compliance. |
Use Scenario: Dynamically routing address/data between dual SDRAM banks in high-bandwidth memory controllers. IC Role / Device Role / Timing Role: Low-latency bus switch enabling time-multiplexed access to interleaved memory modules. Use Value: 3 Ω ron minimizes voltage droop across 16-bit data buses; Ioff prevents contention during bank switching transitions. |
| Bus Isolation | Low-Distortion Signal Gating |
Use Scenario: Electrically isolating legacy parallel bus segments (e.g., ISA, LPC) from modern SoC peripherals during firmware updates. IC Role / Device Role / Timing Role: High-impedance break-before-make switch ensuring clean domain separation during reconfiguration. Use Value: −2 V undershoot protection prevents latch-up during hot-swap events; 10 µA Ioff guarantees zero leakage in powered-down zones. |
Use Scenario: Enabling/disabling analog sensor outputs (e.g., audio ADC/DAC paths, precision voltage references) without distortion. IC Role / Device Role / Timing Role: Analog-capable FET switch preserving signal linearity and bandwidth due to resistive conduction path. Use Value: Flat 3 Ω ron across 0–5 V range avoids gain error; 14 pF Cio(ON) maintains >100 MHz small-signal bandwidth. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBTD3384CPW | 8-bit non-inverting bus switch with 3-state outputs; higher ron (5 Ω typ), no undershoot protection. | Lacks active undershoot clamp; suitable only where transient immunity is externally managed. | Choose when strict −2 V protection is unnecessary and 3-state output behavior is preferred over bidirectional pass-through. |
| 74LVC244APW | Octal buffer with 3-state outputs; CMOS logic, not FET-switch architecture; ron not specified; no Ioff or undershoot features. | Requires direction control; incompatible with analog/mixed-signal gating; no partial-power-down capability. | Select only for pure digital buffering where bidirectionality, low ron, and power-down isolation are not required. |
Compared with SN74CBT3244CPW, SN74CBTD3384CPW offers higher drive strength but sacrifices undershoot resilience, while 74LVC244APW provides simpler logic control at the cost of analog performance, power-down safety, and signal transparency.
Availability
SN74CBT3244CPW is available at Aetrix Electronics and suitable for USB interface design, memory interleaving architectures, and bus isolation systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant TSSOP packaging.
Supply support for SN74CBT3244CPW 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 expertise in high-speed logic and interface solutions.
The SN74CBT3244CPW belongs to TI's CBT (Crossbar Bus Technology) family, engineered for ultra-low-distortion, bidirectional signal routing in mixed-voltage digital and analog systems.
FAQ
What is the maximum undershoot voltage the SN74CBT3244CPW can withstand on its A/B ports?
The SN74CBT3244CPW provides active undershoot protection up to −2 V on both A and B ports, as verified in the SCDS130A datasheet under "Undershoot Characteristics." This protection ensures the switch remains reliably OFF during transient negative excursions, preventing unintended conduction or damage. The SN74CBT3244CPW achieves this via integrated sensing circuitry that detects sub-ground events and forces isolation.
Does the SN74CBT3244CPW support partial-power-down operation, and how is it implemented?
Yes, the SN74CBT3244CPW fully supports partial-power-down via its Ioff feature. When VCC = 0 V, the device limits Ioff to 10 µA maximum while maintaining high-impedance isolation between A and B ports. This prevents backflow current into powered-down sections of the system. The SN74CBT3244CPW achieves this through internal FET cutoff logic that remains functional even with no supply voltage applied.
What is the typical ON-state resistance (ron) of the SN74CBT3244CPW, and how does it affect signal integrity?
The SN74CBT3244CPW has a typical ON-state resistance of 3 Ω at VCC = 4.5 V and IO = 30 mA. This low ron minimizes voltage drop and power dissipation during signal transmission - for example, generating only ~90 mV drop at 30 mA - preserving logic margins and reducing thermal stress. The SN74CBT3244CPW maintains this ron flatness across its 0–5 V input range, supporting analog signal fidelity.
Can the SN74CBT3244CPW be used for analog signal switching, and what parameters validate this capability?
Yes, the SN74CBT3244CPW is qualified for analog signal gating due to its resistive FET-switch architecture, flat ron vs. voltage curve, and low OFF-capacitance (5.5 pF). Its 14 pF Cio(ON), 3 Ω ron, and absence of CMOS threshold discontinuities enable distortion-free transmission of DC-coupled or AC-coupled analog waveforms up to ~100 MHz. The SN74CBT3244CPW datasheet explicitly lists "analog applications" in its supported use cases.
What are the recommended operating conditions for VCC and ambient temperature for the SN74CBT3244CPW?
The SN74CBT3244CPW is rated for VCC between 4 V and 5.5 V, and operating free-air temperature from −40°C to +85°C. These ranges are validated per JEDEC JESD47 and confirmed in the "Recommended Operating Conditions" table of SCDS130A. Operation outside these bounds may compromise undershoot protection, Ioff behavior, or timing specifications. The SN74CBT3244CPW meets these conditions in its TSSOP-20 (PW) package with MSL Level-1 handling.
SN74CBT3244CPW 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:
- 4V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
SN74CBT3244CPW FAQ
1.How can I place an order for SN74CBT3244CPW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CBT3244CPW 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 SN74CBT3244CPW reliable?
The price and inventory of SN74CBT3244CPW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBT3244CPW is usually 5 days.
3.What payment methods are accepted for SN74CBT3244CPW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74CBT3244CPW transactions.
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4.How is shipping managed for SN74CBT3244CPW?
SN74CBT3244CPW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74CBT3244CPW 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 SN74CBT3244CPW?
For technical support, including SN74CBT3244CPW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBT3244CPW requirements.
6.How does Aetrix verify that SN74CBT3244CPW is sourced from the original manufacturer or authorized distributors?
All SN74CBT3244CPW 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 SN74CBT3244CPW meets industry standards.
7.What is the process for return or replacement of SN74CBT3244CPW?
All SN74CBT3244CPW units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBT3244CPW, 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 SN74CBT3244CPW part is unused and in its original packaging.
Return procedure for SN74CBT3244CPW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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