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Texas Instruments SN74CBT3244CDW
- Part No.:
- SN74CBT3244CDW
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74CBT3244CDW.pdf
- Description:
- IC BUS SWITCH 4 X 1:1 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,210
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Product details
Overview
SN74CBT3244CDW from Texas Instruments is a high-speed TTL-compatible 8-bit FET bus switch organized as two independent 4-bit switches, featuring near-zero propagation delay (0.15 ns typical at 5 V), low ON-state resistance (3 Ω typical), and bidirectional signal flow with undershoot protection up to −2 V on A/B ports. It supports mixed-voltage signaling (0.8 V to 5 V) and is used in USB interface isolation and memory interleaving applications.
For engineers reviewing the SN74CBT3244CDW datasheet, SN74CBT3244CDW pinout, SN74CBT3244CDW application, or SN74CBT3244CDW equivalent, key selection criteria include Ioff partial-power-down capability, 5.5 pF OFF-state I/O capacitance, VCC operating range (4–5.5 V), and SOIC-20 package compatibility for legacy board designs.
Technical Context
The SN74CBT3244CDW implements dual 4-bit FET-based analog/digital bus switches with independent active-low output-enable inputs (1OE, 2OE). Each switch channel provides true bidirectional conduction with no direction control required, relying on passive FET topology and internal undershoot-protection circuitry that clamps transient events below −2 V while maintaining OFF-state integrity.
It features Ioff isolation during partial power-down, ensuring no backflow current when VCC = 0 V, and supports TTL/CMOS-compatible control inputs (VIH ≥ 2 V, VIL ≤ 0.8 V) while data I/Os operate across 0–5.5 V. The device meets JESD 78 Class II latch-up immunity (>100 mA) and JESD 22 ESD ratings (2000-V HBM, 1000-V CDM).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4 V to 5.5 V - Enables direct integration into 5-V logic systems without level-shifting. |
| ron (Typical) | 3 Ω - Minimizes voltage drop and signal distortion under ±64 mA load per switch path. |
| tpd (Max) | 0.24 ns at 4 V - Enables sub-nanosecond timing-critical signal gating in high-speed buses. |
| Cio(OFF) | 5.5 pF typical - Reduces capacitive loading on driven lines, preserving signal edge rates. |
| Ioff | 10 µA at VCC = 0 V - Prevents damaging current injection during system power sequencing. |
| VI/O Range | 0 V to 5.5 V - Supports interoperability between 1.8-V, 2.5-V, 3.3-V, and 5-V logic domains. |
| Undershoot Protection | −2 V on A/B ports - Maintains OFF-state integrity during negative transients without external clamping. |
Pinout & Package
SN74CBT3244CDW uses a 20-pin SOIC (DW) package with 7.5 mm body width, 2.65 mm max height, and 1.27 mm lead pitch. Pin 1 index is marked by a beveled corner; devices are shipped in tubes (25 pcs/tube) with RoHS-compliant NiPdAu lead finish and MSL Level-1 reflow rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE | Active-low output-enable control | Drives associated 4-bit switch ON (low) or OFF (high); requires pull-up to VCC for power-up high-impedance safety. |
| 1A1–1A4, 2A1–2A4 | Port A data terminals (Group 1 & 2) | Input/output pins for first and second 4-bit switch banks; bidirectional with no direction control needed. |
| 1B1–1B4, 2B1–2B4 | Port B data terminals (Group 1 & 2) | Paired bidirectional counterparts to A-side pins; connected internally via low-ron FETs when OE is asserted. |
| VCC, GND | Power supply and reference | Single 4–5.5 V supply; GND serves as common return for all I/O and control signals. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional zero-delay switching | Enables transparent signal pass-through in either direction without added latency or direction logic. |
| Undershoot protection (−2 V) | Prevents false turn-on and latch-up during negative transients without external diodes or PCB layout changes. |
| Ioff partial-power-down support | Guarantees isolation between powered and unpowered system domains, critical for hot-swap and modular backplanes. |
| Low 5.5-pF OFF-state capacitance | Minimizes crosstalk and signal degradation in high-frequency bus isolation applications like USB 2.0 routing. |
| Mixed-voltage I/O (0–5.5 V) | Eliminates need for discrete level shifters when interfacing 1.8-V microcontrollers to 5-V peripherals. |
Applications
| USB Interface Isolation | Memory Interleaving |
|---|---|
Use Scenario: Isolating D+ and D− lines between host controller and peripheral port during enumeration or fault conditions. IC Role / Device Role / Timing Role: Bidirectional analog switch enabling full-speed USB 2.0 signal integrity with <0.25 ns propagation delay. Use Value: Preserves eye diagram margins and reduces jitter accumulation by limiting OFF-state capacitance to 5.5 pF. |
Use Scenario: Dynamically routing address/data between two memory banks in a dual-channel SDRAM subsystem. IC Role / Device Role / Timing Role: Low-ron (3 Ω) bus switch enabling simultaneous access to interleaved memory segments without timing skew. Use Value: Delivers sub-nanosecond enable/disable times (1.5 ns typ) to meet tight tDIS/tEN setup windows in DDR controllers. |
| Bus Isolation | Low-Distortion Signal Gating |
Use Scenario: Segregating PCI or ISA bus segments to prevent noise coupling and ground loop formation. IC Role / Device Role / Timing Role: High-impedance OFF-state isolator with Ioff protection during partial system shutdown. Use Value: Blocks backfeed current (<10 µA at VCC = 0 V), protecting powered sections during maintenance or firmware updates. |
Use Scenario: Enabling/disabling analog sensor signals (e.g., audio line-level or thermocouple outputs) in precision measurement systems. IC Role / Device Role / Timing Role: Analog-capable FET switch with flat frequency response up to 500 MHz due to low ron and Cio. Use Value: Maintains signal fidelity with <0.01% THD+N by minimizing nonlinear conduction and charge injection. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBTD3384CDW | Higher ron (5 Ω typ), supports 3.3-V-only operation (VCC = 2.3–3.6 V), adds 3-state control per bit. | Targeted for low-voltage embedded buses; lacks −2 V undershoot protection and Ioff capability. | Select when operating exclusively at 3.3 V and requiring per-bit enable granularity over group enable. |
| SN74LVC2G66DCKR | Single-channel SPST switch, lower ron (0.6 Ω typ), but only 2 pins; no multi-bit grouping or dual OE control. | Suitable for point-to-point signal gating, not bus-wide isolation; lacks undershoot clamp diodes. | Choose for compact, low-rón single-line switching where space constraints preclude 20-pin SOIC footprint. |
Compared with SN74CBT3244CDW, SN74CBTD3384CDW trades undershoot robustness and Ioff for lower-voltage compatibility and finer control granularity, while SN74LVC2G66DCKR offers superior ron and size efficiency at the cost of bus-scale functionality and transient protection.
Availability
SN74CBT3244CDW is available at Aetrix Electronics and suitable for USB interface isolation, memory interleaving, and bus isolation applications requiring stable component supply, long-term industrial lifecycle support, and SOIC-20 footprint compatibility.
Supply support for SN74CBT3244CDW 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 solutions, with over 90 years of innovation in high-reliability IC design.
The SN74CBT3244CDW belongs to TI's CBT (Crosspoint Bus Transceiver) family, engineered for high-speed digital and analog signal routing in computing, communications, and industrial control systems where low-latency, low-distortion switching is critical.
FAQ
What is the maximum undershoot voltage the SN74CBT3244CDW can tolerate on its A/B ports?
The SN74CBT3244CDW provides active undershoot protection up to −2 V on both A and B ports, as verified in the SCDS130A datasheet Section 6. This protection ensures the switch remains reliably OFF during negative transients without requiring external clamping diodes or PCB layout modifications. The SN74CBT3244CDW maintains high-impedance isolation even under these conditions, preventing false turn-on and signal corruption.
Does the SN74CBT3244CDW support partial-power-down operation?
Yes, the SN74CBT3244CDW fully supports partial-power-down via its Ioff feature. When VCC = 0 V, the device limits backflow current to ≤10 µA (per datasheet Section 5), isolating powered and unpowered domains. This behavior is critical for hot-swap systems and modular backplanes. The SN74CBT3244CDW achieves this without external circuitry, making it suitable for systems with staggered power sequencing.
What is the typical ON-state resistance of the SN74CBT3244CDW and how does it affect signal integrity?
The SN74CBT3244CDW has a typical ON-state resistance (ron) of 3 Ω at VCC = 4.5 V and IO = 30 mA. This low ron minimizes voltage drop and power dissipation across the switch, preserving signal amplitude and reducing harmonic distortion-especially important in analog signal gating and high-speed digital buses. The SN74CBT3244CDW maintains this performance across its full 4–5.5 V VCC range, ensuring consistent behavior in varying supply conditions.
Can the SN74CBT3244CDW interface between different logic voltage levels such as 1.8 V and 5 V?
Yes, the SN74CBT3244CDW supports data I/O signaling from 0 V to 5.5 V independently of VCC, enabling seamless interfacing between 0.8-V, 1.2-V, 1.5-V, 1.8-V, 2.5-V, 3.3-V, and 5-V logic families. Control inputs accept TTL/5-V CMOS levels (VIH ≥ 2 V, VIL ≤ 0.8 V), while the SN74CBT3244CDW's FET architecture ensures bidirectional voltage translation without level-shifters or additional biasing components.
What package type and thermal characteristics apply to the SN74CBT3244CDW?
The SN74CBT3244CDW uses a 20-pin SOIC (DW) package with θJA = 58°C/W (datasheet Section 4), 7.5 mm body width, and 2.65 mm max height. It is RoHS-compliant with NiPdAu lead finish and MSL Level-1 (unlimited floor life). The SN74CBT3244CDW is supplied in tubes (25 units/tube) and supports standard reflow profiles up to 260°C peak, making it compatible with legacy assembly lines and automated optical inspection workflows.
SN74CBT3244CDW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CBT
- Package/Case:
- 20-SOIC (0.295", 7.50mm 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-SOIC
SN74CBT3244CDW FAQ
1.How can I place an order for SN74CBT3244CDW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CBT3244CDW 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 SN74CBT3244CDW reliable?
The price and inventory of SN74CBT3244CDW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBT3244CDW is usually 5 days.
3.What payment methods are accepted for SN74CBT3244CDW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74CBT3244CDW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74CBT3244CDW?
SN74CBT3244CDW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74CBT3244CDW 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 SN74CBT3244CDW?
For technical support, including SN74CBT3244CDW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBT3244CDW requirements.
6.How does Aetrix verify that SN74CBT3244CDW is sourced from the original manufacturer or authorized distributors?
All SN74CBT3244CDW 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 SN74CBT3244CDW meets industry standards.
7.What is the process for return or replacement of SN74CBT3244CDW?
All SN74CBT3244CDW units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBT3244CDW, 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 SN74CBT3244CDW part is unused and in its original packaging.
Return procedure for SN74CBT3244CDW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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