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Texas Instruments 74CB3Q3245RGYRG4
- Part No.:
- 74CB3Q3245RGYRG4
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 20-VFQFN Exposed Pad
- Datasheet:
-
74CB3Q3245RGYRG4.pdf
- Description:
- IC BUS SWITCH 8 X 1:1 20VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,198
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Product details
Overview
74CB3Q3245RGYRG4 from Texas Instruments is an 8-bit FET bus switch IC designed for high-bandwidth bidirectional signal routing in low-voltage digital systems. It operates from 2.3 V to 3.6 V, delivers rail-to-rail switching (0–5 V), features 4 Ω typical ON-state resistance, 3.5 pF OFF-state I/O capacitance, and supports up to 500 MHz bandwidth-enabling use in PCI interface and memory interleaving applications.
For engineers reviewing the 74CB3Q3245RGYRG4 datasheet, 74CB3Q3245RGYRG4 pinout, 74CB3Q3245RGYRG4 application, or 74CB3Q3245RGYRG4 equivalent, key selection criteria include its 20-pin VQFN (RGY) package, Ioff partial-power-down capability, 5-V tolerant I/Os, and sub-0.2 ns propagation delay under 3.3-V operation.
Technical Context
The 74CB3Q3245RGYRG4 implements a charge-pump-enhanced FET architecture to elevate gate voltage and maintain flat, low ON-state resistance across input voltage range (0–5 V). Its single OE control enables synchronous bidirectional connection between A and B ports with near-zero propagation delay and no direction pin required.
It supports true 0-V to 5-V analog/digital signal gating regardless of VCC (2.5 V or 3.3 V), with Ioff circuitry preventing backflow during partial power-down and undershoot clamp diodes on all data/control inputs-ensuring robustness in mixed-voltage system interconnects.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.3 V to 3.6 V - Enables interoperability with both 2.5-V and 3.3-V logic domains without level shifters. |
| ron (Typ) | 4 Ω - Ensures minimal insertion loss and signal integrity for high-speed digital and analog signals up to 500 MHz. |
| Cio(OFF) | 3.5 pF typ - Reduces capacitive loading on buses, preserving edge rate and minimizing crosstalk in dense PCB layouts. |
| Propagation Delay | 0.12–0.20 ns - Delivers near-instantaneous signal pass-through, critical for timing-critical interconnects like memory channels. |
| Ioff Support | Yes - Blocks current flow when powered down, enabling safe hot-insertion and partial-power-down system architectures. |
| 5-V Tolerant I/O | Yes, with VCC powered up or down - Allows direct interfacing with legacy 5-V peripherals without external protection or translation. |
| fOE Max | 20 MHz - Supports fast enable/disable cycling for dynamic bus isolation in real-time control and test equipment. |
Pinout & Package
74CB3Q3245RGYRG4 uses a 20-pin VQFN package (RGY) with 0.5 mm pitch, 3.5 mm × 4.5 mm body, and exposed thermal pad (Pin 21). The package is RoHS-compliant, moisture sensitivity level 2 (260°C, 1 year), and requires soldering of the thermal pad for optimal thermal performance and mechanical reliability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 20 | NC | No internal connection - Must be left unconnected; not usable as ground or dummy fill. |
| 2–9, 12–19 | A1–A8, B1–B8 | Bidirectional data terminals - Each A/B pair forms a dedicated switch path; no direction control needed. |
| 10 | GND | Ground reference - Primary return path for supply and signal currents; must be low-impedance. |
| 11 | VCC | Power supply - Supplies internal charge pump and logic; bypass capacitor required at pin. |
| 12 | OE | Active-low output enable - Driven low to connect A↔B ports; high-Z state when high (100% compatible with TTL/CMOS). |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail analog/digital switching | Supports 0–5 V signaling with 2.5-V or 3.3-V VCC - Eliminates need for external voltage translators in mixed-signal interconnects. |
| Charge-pump gate drive | Maintains flat ron ≤ 8 Ω across full VI/O range - Ensures consistent signal attenuation and timing behavior for wide-voltage swing signals. |
| Undershoot clamp diodes | Integrated on all data and control inputs - Protects against negative transients down to –1.8 V without external components. |
| Low ICC (1 mA typ) | Reduces static power draw in always-on isolation paths - Critical for battery-backed or energy-sensitive subsystems. |
| Latch-up immunity | Exceeds 100 mA per JESD 78 Class II - Guarantees robust operation in noisy industrial or automotive environments. |
Applications
| PCI Express Lane Isolation | Differential Signal Routing |
|---|---|
|
Use Scenario: Isolating PCIe Gen1/Gen2 lanes during hot-plug events or firmware reconfiguration in server backplanes. IC Role / Device Role / Timing Role: Bidirectional, low-latency bus switch enabling dynamic lane disable while preserving signal integrity. Use Value: Sub-0.2 ns propagation delay and 3.5 pF Cio(OFF) prevent jitter accumulation and maintain eye diagram compliance. |
Use Scenario: Routing LVDS or RSDS differential pairs through shared PCB traces in FPGA-based video processing modules. IC Role / Device Role / Timing Role: Analog-capable FET switch providing matched impedance paths for differential signals. Use Value: 4 Ω ron and rail-to-rail operation preserve common-mode range and minimize skew between complementary lines. |
| Memory Interleaving Control | Legacy Peripheral Interface |
|
Use Scenario: Dynamically connecting alternate DRAM banks to a memory controller in embedded SoC designs with dual-channel support. IC Role / Device Role / Timing Role: High-bandwidth 8-bit switch enabling bank-select multiplexing without timing penalty. Use Value: 500 MHz bandwidth and flat ron ensure setup/hold timing margins remain intact across all address/data bits. |
Use Scenario: Interfacing modern 3.3-V microcontrollers with legacy 5-V UART, SPI, or GPIO peripherals in industrial HMIs. IC Role / Device Role / Timing Role: Level-tolerant bidirectional bridge eliminating discrete level-shifter components. Use Value: 5-V I/O tolerance with 2.5-V/3.3-V VCC allows direct connection without external resistors or translators. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar FET bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| IDTQS3VH384 | Same functional topology and pinout; slightly higher ron (5 Ω typ) and Cio(OFF) (4.5 pF typ); no integrated undershoot clamps. | Valid for general-purpose bus isolation but lacks transient protection for noisy industrial environments. | Prefer 74CB3Q3245RGYRG4 where ESD/undershoot robustness or lowest possible capacitance is required. |
| SN74CBTLV3245PWR | Lower VCC range (2.3–3.6 V same), but ron = 5.5 Ω typ and Cio(OFF) = 4.0 pF; no charge pump - ron rises significantly below 3 V. | Suitable for cost-sensitive consumer applications with stable 3.3-V rails, but not recommended for 2.5-V or wide-voltage swing use. | Select 74CB3Q3245RGYRG4 for designs requiring flat ron across 0–5 V or operation at 2.5 V with minimal signal degradation. |
Compared with IDTQS3VH384 and SN74CBTLV3245PWR, the 74CB3Q3245RGYRG4 delivers superior high-frequency performance, lower ON-resistance flatness, and integrated transient protection-making it the preferred choice for timing-critical, mixed-voltage, or ruggedized system interconnects.
Availability
74CB3Q3245RGYRG4 is available at Aetrix Electronics and suitable for PCI interface design, memory subsystem isolation, differential signal routing, and legacy peripheral bridging requiring stable component supply and long-term production continuity.
Supply support for 74CB3Q3245RGYRG4 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 CB3Q family-including 74CB3Q3245RGYRG4-is engineered for high-bandwidth, low-distortion signal gating in computing, networking, and communications infrastructure, emphasizing rail-to-rail analog compatibility and robust partial-power-down operation.
FAQ
What is the package type and footprint of the 74CB3Q3245RGYRG4?
The 74CB3Q3245RGYRG4 uses a 20-pin VQFN package (RGY) with 3.5 mm × 4.5 mm body, 0.5 mm pitch, and an exposed thermal pad (Pin 21). Its land pattern requires soldering the thermal pad for thermal dissipation and mechanical stability, per TI's SLUA271 guidelines. The package is MSL Level-2 (260°C, 1 year).
Does the 74CB3Q3245RGYRG4 support 5-V tolerant I/Os with 2.5-V VCC?
Yes, the 74CB3Q3245RGYRG4 supports 0–5 V signaling on all A/B I/O pins regardless of whether VCC is 2.5 V or 3.3 V-and even when powered down. This is achieved via internal protection structures, enabling direct interfacing with 5-V peripherals without external level shifters or clamping circuits.
What is the maximum operating frequency supported by the 74CB3Q3245RGYRG4?
The 74CB3Q3245RGYRG4 supports up to 500 MHz bandwidth for signal pass-through, verified by TI's characterization of its high-bandwidth FET path. Its OE input supports up to 20 MHz switching frequency, and propagation delay remains below 0.2 ns-making it suitable for PCIe Gen1/Gen2, DDR memory, and high-speed serial links.
How does the Ioff feature function in the 74CB3Q3245RGYRG4?
The Ioff feature in the 74CB3Q3245RGYRG4 disables current flow between A and B ports when VCC = 0 V, preventing damaging back-current from live buses into a powered-down device. This enables safe partial-power-down operation in modular systems, such as hot-swappable cards or power-gated subsystems, without external isolation circuitry.
Is the 74CB3Q3245RGYRG4 pin-compatible with other packages in the CB3Q family?
Yes-the 74CB3Q3245RGYRG4 shares identical pinout and functionality with other 20-pin variants including DBQ (SSOP), DGV (TVSOP), PW (TSSOP), and GQN (VFBGA). All share the same A1–A8/B1–B8 mapping, OE, VCC, GND, and NC pin assignments-enabling drop-in replacement across form factors for layout flexibility.
74CB3Q3245RGYRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CB
- Package/Case:
- 20-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Type:
- Bus Switch
- Circuit:
- 8 x 1:1
- Independent Circuits:
- 1
- 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)
74CB3Q3245RGYRG4 FAQ
1.How can I place an order for 74CB3Q3245RGYRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74CB3Q3245RGYRG4 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 74CB3Q3245RGYRG4 reliable?
The price and inventory of 74CB3Q3245RGYRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74CB3Q3245RGYRG4 is usually 5 days.
3.What payment methods are accepted for 74CB3Q3245RGYRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74CB3Q3245RGYRG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74CB3Q3245RGYRG4?
74CB3Q3245RGYRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74CB3Q3245RGYRG4 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 74CB3Q3245RGYRG4?
For technical support, including 74CB3Q3245RGYRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74CB3Q3245RGYRG4 requirements.
6.How does Aetrix verify that 74CB3Q3245RGYRG4 is sourced from the original manufacturer or authorized distributors?
All 74CB3Q3245RGYRG4 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 74CB3Q3245RGYRG4 meets industry standards.
7.What is the process for return or replacement of 74CB3Q3245RGYRG4?
All 74CB3Q3245RGYRG4 units undergo pre-shipment inspection (PSI). If there is an issue with 74CB3Q3245RGYRG4, 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 74CB3Q3245RGYRG4 part is unused and in its original packaging.
Return procedure for 74CB3Q3245RGYRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
74CB3Q3245RGYRG4 Tags
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