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Texas Instruments SN74CB3Q16245DGVR
- Part No.:
- SN74CB3Q16245DGVR
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 48-TFSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74CB3Q16245DGVR.pdf
- Description:
- IC BUS SWITCH 8 X 1:1 48TVSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,886
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Product details
Overview
SN74CB3Q16245 from Texas Instruments is a 16-bit FET bus switch IC designed for high-bandwidth signal routing in low-voltage digital systems. It features dual 8-bit bidirectional channels, 5 Ω typical ON-state resistance (ron), rail-to-rail 0–5 V switching at 3.3 V VCC, and supports partial-power-down via Ioff. It is used in PCI interface isolation and memory interleaving applications requiring minimal propagation delay and low capacitive loading.
For engineers reviewing the SN74CB3Q16245 datasheet, SN74CB3Q16245 pinout, SN74CB3Q16245 application, or SN74CB3Q16245 equivalent, key selection criteria include its 48-pin TVSOP (DGV) package, 2.3–3.6 V supply range, 500 MHz bandwidth capability, 4 pF OFF-state I/O capacitance, and compatibility with TTL/3.3 V/5 V logic levels on control inputs.
Technical Context
The SN74CB3Q16245 implements two independent 8-bit FET-based analog/digital switches with charge-pump gate drive to maintain low, flat ron across voltage and temperature. Each channel is controlled by dedicated OE pins (1OE, 2OE), enabling selective 8-bit or combined 16-bit operation.
Its architecture supports bidirectional, near-zero-delay signal flow with rail-to-rail voltage translation (0–5 V with 3.3 V VCC), 5-V-tolerant I/Os regardless of power state, and Ioff protection that blocks current backflow during partial power-down-critical for hot-swap and mixed-supply system integrity.
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) | 5 Ω - Ensures minimal signal attenuation and distortion for high-speed data paths up to 500 MHz. |
| Cio(OFF) (Typ) | 4 pF - Reduces capacitive loading on buses, preserving signal integrity and timing margins in dense PCB layouts. |
| tpd (Max) | 0.3 ns - Delivers near-instantaneous bidirectional signal transfer, essential for synchronous bus gating and clock distribution. |
| Ioff (Max) | 1 µA - Guarantees robust isolation between powered and unpowered system domains during partial power-down. |
| fOE (Max) | 20 MHz - Supports fast enable/disable cycling for dynamic bus arbitration and power-gated subsystem control. |
| VI/O Range | 0 to 5.5 V - Allows seamless interfacing with legacy 5 V peripherals while operating from 2.5 V/3.3 V supplies. |
| ESD Rating | 2000 V HBM - Meets industrial-grade robustness requirements for handling and board-level reliability. |
Pinout & Package
SN74CB3Q16245DGVR is packaged in a 48-pin TVSOP (DGV) with 0.4 mm pitch, 7.1 mm × 4.4 mm body, and 1.2 mm max height per JEDEC MO-153. Pin 1 is located in Quadrant Q1 per tape-and-reel orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE | Channel enable inputs | Active-low controls for independent 8-bit switch sections; tied to VCC via pullup for power-up high-impedance safety. |
| 1A1–1A8, 2A1–2A8 | Data input/output ports (side A) | Bidirectional I/O terminals connected to one side of each 8-bit switch; support 0–5 V signaling. |
| 1B1–1B8, 2B1–2B8 | Data input/output ports (side B) | Bidirectional I/O terminals connected to opposite side; electrically identical to A-side with no directionality constraint. |
| VCC | Supply voltage | Single 2.3–3.6 V rail powering internal charge pump and logic; enables 5-V-tolerant I/O operation. |
| GND | Ground reference | Common return path for all switch channels and control circuitry; multiple pins reduce ground bounce. |
| NC | No internal connection | Pins 1 and 48 are unconnected; must be left floating or grounded per layout best practices-not used for thermal relief. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail switching | Supports 0–5 V signal translation with 3.3 V VCC or 0–3.3 V with 2.5 V VCC-enables mixed-voltage interconnect without external level shifters. |
| Charge-pump gate drive | Elevates pass-transistor gate voltage to ensure flat, low ron (5 Ω typ) across full I/O voltage swing and temperature range. |
| 5-V-tolerant I/Os | Operates safely with 5 V signals applied to A/B ports even when VCC = 0 V-critical for hot-plug and power sequencing resilience. |
| Undershoot clamp diodes | Integrated diodes on all data and control inputs limit negative transients to –1.8 V, protecting against ESD and signal reflections. |
| Partial-power-down support | Ioff circuitry limits leakage to ≤1 µA when VCC = 0, preventing backdrive damage in multi-rail systems during standby or fault conditions. |
Applications
| PCI Interface Isolation | Differential Signal Interface |
|---|---|
Use Scenario: Isolating PCI bus segments to prevent noise coupling and enable hot-swap capability in embedded computing chassis. IC Role / Device Role / Timing Role: Bidirectional 16-bit bus switch providing galvanic separation between upstream and downstream PCI agents while maintaining signal fidelity. Use Value: Eliminates need for discrete isolation components; preserves 33 MHz PCI timing with sub-0.3 ns propagation delay and 4 pF OFF-state capacitance. | Use Scenario: Routing LVDS or RSDS differential pairs through shared backplane traces where single-ended control signals require separate switching. IC Role / Device Role / Timing Role: Low-distortion analog/digital switch enabling dynamic reconfiguration of differential signal paths without introducing skew or jitter. Use Value: Flat 5 Ω ron and symmetric ON-resistance minimize amplitude mismatch between differential legs, supporting >500 MHz bandwidth. |
| Memory Interleaving | Bus Isolation |
Use Scenario: Dynamically connecting alternate memory banks (e.g., DDR2 and LPDDR) to a shared controller in power-aware mobile SoC designs. IC Role / Device Role / Timing Role: Dual 8-bit switch enabling time-multiplexed access to two independent memory subsystems using common address/data lines. Use Value: Near-zero tpd and rail-to-rail voltage support allow seamless switching between 1.8 V and 3.3 V memory interfaces without level-shifting delays. | Use Scenario: Segregating debug, test, or configuration buses from main system data paths to prevent interference during firmware updates or diagnostics. IC Role / Device Role / Timing Role: High-isolation bus gate activated only during maintenance windows, presenting high-impedance state during normal operation. Use Value: 4 pF Cio(OFF) and Ioff protection ensure zero signal leakage and no backfeed risk-even when isolated bus is unpowered. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBT16245DGVR | Higher ron (~7 Ω typ), no charge pump, 4.5 V max VCC, no Ioff support. | Lacks partial-power-down capability and 5-V-tolerant I/Os under VCC = 0; limited to fully powered systems. | Select when cost sensitivity outweighs power-down safety and 5-V tolerance requirements. |
| SN74LVC16245ADGVR | True 16-bit buffer (non-switch), 3-state outputs, 1.65–3.6 V VCC, no rail-to-rail switching. | Provides direction-controlled buffering-not bidirectional analog switching; cannot translate 5 V signals with 2.5 V supply. | Choose only for unidirectional bus driving where voltage translation and Ioff are not required. |
Compared with SN74CB3Q16245DGVR, SN74CBT16245DGVR offers lower cost but sacrifices Ioff protection and 5-V I/O tolerance, while SN74LVC16245ADGVR provides direction-controlled buffering instead of transparent analog switching-making it unsuitable for bidirectional voltage translation or hot-swap isolation.
Availability
SN74CB3Q16245DGVR is available at Aetrix Electronics and suitable for PCI interface isolation, memory interleaving, differential signal routing, and bus isolation applications requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for SN74CB3Q16245DGVR 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 interface solutions.
The SN74CB3Q16245 belongs to TI's Widebus™ family of high-bandwidth FET bus switches, engineered specifically for low-latency, low-distortion signal routing in broadband communications, networking infrastructure, and data-intensive computing platforms.
FAQ
What is the maximum signal frequency supported by the SN74CB3Q16245DGVR?
The SN74CB3Q16245DGVR supports signal paths up to 500 MHz, enabled by its low 5 Ω typical ON-state resistance and 4 pF OFF-state I/O capacitance. This bandwidth is validated under loaded conditions with proper PCB layout and termination; actual system performance depends on trace impedance, load capacitance, and signal edge rates.
Does the SN74CB3Q16245DGVR support 5-V logic levels when powered from 2.5 V?
Yes, the SN74CB3Q16245DGVR supports 0–5 V signaling on its A/B ports even when VCC = 2.5 V, due to its charge-pump-enhanced FET architecture and 5-V-tolerant I/O design. Control inputs (1OE/2OE) also accept 5 V TTL levels regardless of VCC state.
How does the Ioff feature function in the SN74CB3Q16245DGVR during partial power-down?
In the SN74CB3Q16245DGVR, Ioff limits current backflow to ≤1 µA when VCC = 0 V and I/O voltages range from 0 to 5.5 V. This prevents damage to powered system sections and maintains isolation-critical for hot-swap, battery-backed, or multi-rail architectures where subsystems power up/down independently.
Can the SN74CB3Q16245DGVR be used for analog signal switching?
Yes, the SN74CB3Q16245DGVR is specified for both digital and analog applications-including differential signaling and low-distortion gating-due to its rail-to-rail voltage range, flat ron, low Cio(OFF), and absence of body diode conduction. Its FET structure ensures linear, bidirectional analog pass-through with minimal THD.
What is the recommended pull-up resistor value for OE pins on the SN74CB3Q16245DGVR?
The OE pins of the SN74CB3Q16245DGVR should be tied to VCC via a pullup resistor to ensure high-impedance state at power-up. Minimum value is determined by the driver's current-sinking capability; TI recommends ≥1 kΩ for standard CMOS drivers, with 4.7 kΩ commonly used for noise immunity and current limiting.
SN74CB3Q16245DGVR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CB
- Package/Case:
- 48-TFSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Bus Switch
- Circuit:
- 8 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:
- 48-TVSOP
SN74CB3Q16245DGVR FAQ
1.How can I place an order for SN74CB3Q16245DGVR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CB3Q16245DGVR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
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The price and inventory of SN74CB3Q16245DGVR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CB3Q16245DGVR is usually 5 days.
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5.How can I obtain technical support or documentation for SN74CB3Q16245DGVR?
For technical support, including SN74CB3Q16245DGVR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CB3Q16245DGVR requirements.
6.How does Aetrix verify that SN74CB3Q16245DGVR is sourced from the original manufacturer or authorized distributors?
All SN74CB3Q16245DGVR 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 SN74CB3Q16245DGVR meets industry standards.
7.What is the process for return or replacement of SN74CB3Q16245DGVR?
All SN74CB3Q16245DGVR units undergo pre-shipment inspection (PSI). If there is an issue with SN74CB3Q16245DGVR, 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 SN74CB3Q16245DGVR part is unused and in its original packaging.
Return procedure for SN74CB3Q16245DGVR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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