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Texas Instruments SN74CB3Q3244RGYR
- Part No.:
- SN74CB3Q3244RGYR
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 20-VFQFN Exposed Pad
- Datasheet:
-
SN74CB3Q3244RGYR.pdf
- Description:
- IC BUS SWITCH 4 X 1:1 20VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,784
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Product details
Overview
SN74CB3Q3244RGYR from Texas Instruments is a high-bandwidth 8-bit FET bus switch organized as two independent 4-bit bidirectional switches, featuring 4 Ω typical ON-state resistance (ron), 3.5 pF typical OFF-state I/O capacitance, and rail-to-rail 0–5 V signal switching with 3.3 V VCC. It supports high-speed data routing in memory interleaving and differential signal interfaces.
For engineers reviewing the SN74CB3Q3244RGYR datasheet, SN74CB3Q3244RGYR pinout, SN74CB3Q3244RGYR application, or SN74CB3Q3244RGYR equivalent, key selection criteria include partial-power-down Ioff support, 5-V-tolerant I/Os with device powered up or down, sub-0.2 ns propagation delay, and QFN-20 (RGY) thermal performance (θJA = 37°C/W).
Technical Context
The SN74CB3Q3244RGYR uses an internal charge pump to elevate the gate voltage of its pass transistors, enabling flat, low ron across the full 0–5 V I/O voltage range and stable rail-to-rail switching at 2.5 V and 3.3 V supply rails. Its dual 4-bit architecture allows flexible configuration as either two independent 4-bit switches or one consolidated 8-bit switch via separate 1OE and 2OE controls.
Designed for signal integrity in high-frequency data paths, it delivers 500 MHz bandwidth capability, near-zero propagation delay (0.12–0.2 ns), and ultra-low OFF-state loading (Cio(OFF) = 3.5 pF typical). The Ioff circuitry ensures backflow protection during partial power-down, and undershoot clamp diodes on control inputs support robust interfacing with TTL and mixed-voltage CMOS drivers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.3 V to 3.6 V - Enables operation in modern low-voltage systems while maintaining 5-V signal tolerance on I/Os. |
| ron (Typical) | 4 Ω at VCC = 3.3 V - Minimizes voltage drop and distortion in high-current digital/analog signal paths. |
| Cio(OFF) | 3.5 pF typical - Reduces capacitive loading on buses, preserving signal edge rate and timing margin. |
| tpd | 0.12–0.2 ns - Supports sub-nanosecond timing-critical applications such as DDR memory gating and SerDes front-end isolation. |
| Ioff | 1 µA max at VCC = 0 V - Prevents damaging current flow during hot-insertion or partial system power-down. |
| fOE(max) | 20 MHz - Allows fast enable/disable cycling for dynamic bus arbitration without compromising signal fidelity. |
| VI/O Range | 0 to 5.5 V - Permits seamless interfacing between 1.2 V, 1.5 V, 1.8 V, 2.5 V, 3.3 V, and 5 V logic domains. |
Pinout & Package
VQFN-20 package (RGY), 3.5 mm × 4.5 mm, 0.5 mm pitch, exposed thermal pad, 1 mm max height. RoHS-compliant, NIPDAU lead finish, MSL Level-2-260°C-1 year.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE | Active-low output-enable control inputs | Independently enable/disable each 4-bit switch section; pulled high via external resistor for power-up safety. |
| 1A1–1A4, 2A1–2A4 | Data input/output ports (A-side) | Bidirectional A-port terminals; tolerate 0–5 V signals regardless of VCC level (2.3–3.6 V). |
| 1B1–1B4, 2B1–2B4 | Data input/output ports (B-side) | Bidirectional B-port terminals; electrically identical to A-side, supporting true bidirectional signal flow. |
| VCC | Positive supply | Power rail for internal charge pump and logic; must be present for Ioff protection and clamp diode operation. |
| GND | Ground reference | Common return path for all I/Os and internal circuitry; connected to exposed thermal pad for thermal and EMI performance. |
Key Features
| Feature | Design Value |
|---|---|
| Charge-pump-enhanced FET switch | Enables flat 4 Ω ron across full 0–5 V I/O swing, eliminating voltage-dependent on-resistance variation. |
| 5-V-tolerant I/Os with VCC powered up/down | Allows live insertion into 5 V buses and safe operation during brownout or partial power-down sequences. |
| Rail-to-rail switching | Supports 0–5 V signaling with 3.3 V VCC or 0–3.3 V with 2.5 V VCC - eliminates level-shifter requirement in mixed-voltage systems. |
| Low Cio(OFF) = 3.5 pF | Minimizes bus loading and signal reflection in high-speed parallel interfaces like memory channels and test access ports. |
| Ioff partial-power-down protection | Blocks reverse current flow when VCC = 0 V, enabling safe hot-swap and modular system design without external isolation. |
Applications
| Memory Interleaving | Differential Signal Interface |
|---|---|
|
Use Scenario: Isolating and routing address/data lines between two DDR SDRAM banks operating under independent clock domains. IC Role / Device Role / Timing Role: Bidirectional 8-bit bus switch providing low-latency, low-distortion signal gating with sub-0.2 ns tpd and 3.5 pF loading. Use Value: Eliminates need for direction-control logic and reduces timing skew between interleaved memory channels. |
Use Scenario: Gating LVDS or RSDS differential pairs in programmable logic interconnect or FPGA I/O expansion. IC Role / Device Role / Timing Role: Low-capacitance, matched-path bidirectional switch preserving differential impedance and common-mode range. Use Value: Maintains signal integrity at >200 MHz while enabling dynamic reconfiguration without added jitter or crosstalk. |
| Bus Isolation | Low-Distortion Signal Gating |
|
Use Scenario: Electrically isolating legacy 5 V peripheral buses from 3.3 V microcontroller subsystems in industrial controllers. IC Role / Device Role / Timing Role: Voltage-tolerant bidirectional switch enabling safe level translation and fault containment. Use Value: Prevents latch-up and backfeed during power sequencing mismatches while supporting hot-plug operation. |
Use Scenario: Enabling/disabling analog sensor outputs (e.g., precision ADC references or DAC outputs) in medical instrumentation. IC Role / Device Role / Timing Role: Low-ron, low-Cio analog-capable switch with minimal THD and no DC offset injection. Use Value: Delivers <0.01% signal distortion and preserves DC accuracy due to symmetrical ron and absence of body diodes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBT3244DBQR | Higher ron (7 Ω typ), no charge pump, 2.5–5.5 V VCC range, higher Cio(OFF) = 6 pF. | Lower bandwidth (≤200 MHz), less suitable for sub-1 ns timing-critical paths. | Preferred where cost sensitivity outweighs speed/low-loading requirements and 5 V VCC is available. |
| SN74LVC1G3157DCKR | Single-pole double-throw (SPDT), 5 V tolerant, ron = 5 Ω, Cio(OFF) = 4.5 pF, only 1 channel. | Limited to 1-bit switching; lacks dual 4-bit architecture and independent OE controls. | Applicable only for point-to-point signal routing-not scalable to multi-bit bus isolation or interleaving. |
Compared with SN74CB3Q3244RGYR, SN74CBT3244DBQR trades bandwidth and loading for wider VCC flexibility, while SN74LVC1G3157DCKR offers compact single-channel routing but cannot replicate the 8-bit bidirectional, independently enabled architecture essential for memory and bus applications.
Availability
SN74CB3Q3244RGYR is available at Aetrix Electronics and suitable for memory interleaving, differential signal interface, and bus isolation applications requiring stable component supply, long-term lifecycle support, and traceable sourcing for industrial and communications equipment.
Supply support for SN74CB3Q3244RGYR 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-performance interface solutions.
The SN74CB3Q3244RGYR belongs to TI's CB3Q family of high-bandwidth FET bus switches, engineered specifically for low-distortion, rail-to-rail signal routing in broadband communications, networking infrastructure, and data-intensive computing systems.
FAQ
What is the maximum signal frequency supported by the SN74CB3Q3244RGYR?
The SN74CB3Q3244RGYR supports up to 500 MHz bandwidth in high-bandwidth data paths, as confirmed in the device's characterization report SCDA008. This performance is enabled by its low 4 Ω typical ON-state resistance and 3.5 pF OFF-state I/O capacitance, which jointly minimize RC delay and signal distortion. Actual usable frequency depends on PCB layout, load capacitance, and drive strength.
Does the SN74CB3Q3244RGYR require external level shifters when interfacing 5 V signals with a 3.3 V VCC supply?
No, the SN74CB3Q3244RGYR does not require external level shifters. Its 5-V-tolerant I/Os support 0–5 V signaling directly with 3.3 V VCC, enabling rail-to-rail switching without voltage translation. This capability is explicitly specified in the recommended operating conditions and verified across VI/O = 0–5.5 V.
How does the Ioff feature protect the SN74CB3Q3244RGYR during partial power-down?
The Ioff circuitry in the SN74CB3Q3244RGYR limits current to ≤1 µA when VCC = 0 V and VI/O = 0–5.5 V, preventing damaging backflow through the switch FETs. This enables safe hot-swap and modular power sequencing in systems where some sections remain active while others are powered down - a key requirement for telecom and server backplane designs.
What is the thermal performance of the SN74CB3Q3244RGYR in its RGY package?
The SN74CB3Q3244RGYR in the VQFN-20 (RGY) package has a junction-to-ambient thermal resistance (θJA) of 37°C/W, per JEDEC JESD 51-5. This value assumes standard PCB layout with the exposed thermal pad soldered to a solid copper plane. The low θJA supports reliable operation at full rated current even in compact, thermally constrained applications.
Can the SN74CB3Q3244RGYR be used for analog signal switching, such as audio or sensor signals?
Yes, the SN74CB3Q3244RGYR is qualified for analog applications including low-distortion signal gating. Its low and flat ron (4 Ω), symmetrical bidirectional conduction, absence of body diodes, and low Cio(OFF) = 3.5 pF make it suitable for audio paths, precision sensor interfaces, and other analog signal routing where THD and DC accuracy matter - as confirmed in the official applications list.
SN74CB3Q3244RGYR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CB
- Package/Case:
- 20-VFQFN Exposed Pad
- 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:
- 2.3V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-VQFN (3.5x4.5)
SN74CB3Q3244RGYR FAQ
1.How can I place an order for SN74CB3Q3244RGYR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CB3Q3244RGYR 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 SN74CB3Q3244RGYR reliable?
The price and inventory of SN74CB3Q3244RGYR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CB3Q3244RGYR is usually 5 days.
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Once your SN74CB3Q3244RGYR 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 SN74CB3Q3244RGYR?
For technical support, including SN74CB3Q3244RGYR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CB3Q3244RGYR requirements.
6.How does Aetrix verify that SN74CB3Q3244RGYR is sourced from the original manufacturer or authorized distributors?
All SN74CB3Q3244RGYR 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 SN74CB3Q3244RGYR meets industry standards.
7.What is the process for return or replacement of SN74CB3Q3244RGYR?
All SN74CB3Q3244RGYR units undergo pre-shipment inspection (PSI). If there is an issue with SN74CB3Q3244RGYR, 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 SN74CB3Q3244RGYR part is unused and in its original packaging.
Return procedure for SN74CB3Q3244RGYR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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