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Texas Instruments SN74CB3Q16245DLR
- Part No.:
- SN74CB3Q16245DLR
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 48-BSSOP (0.295", 7.50mm Width)
- Datasheet:
-
SN74CB3Q16245DLR.pdf
- Description:
- IC BUS SWITCH 8 X 1:1 48SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,080
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Product details
Overview
SN74CB3Q16245DLR from Texas Instruments is a 16-bit FET bus switch optimized for high-bandwidth digital signal routing in 2.5-V/3.3-V systems. It features dual 8-bit bidirectional channels (1A↔1B and 2A↔2B), 5-Ω typical ON-state resistance, rail-to-rail 0–5-V switching capability at 3.3-V VCC, and <0.3 ns propagation delay. It serves as a low-distortion, low-capacitance interface for memory interleaving and PCI bus isolation.
For engineers reviewing the SN74CB3Q16245DLR datasheet, SN74CB3Q16245DLR pinout, SN74CB3Q16245DLR application, or SN74CB3Q16245DLR equivalent, key selection criteria include its 500-MHz bandwidth support, Ioff-enabled partial-power-down operation, 4-pF typical OFF-state I/O capacitance, and SSOP-48 package compatibility with high-density PCB layouts.
Technical Context
The SN74CB3Q16245DLR implements a charge-pump-enhanced FET architecture to maintain flat, low ron (5 Ω typ) across 0–5-V signal swings, enabling rail-to-rail analog/digital signal pass-through without level translation. Its dual independent OE controls (1OE, 2OE) allow granular channel enable/disable for dynamic bus segmentation.
Each 8-bit channel operates bidirectionally with near-zero propagation delay (0.18–0.3 ns), minimal loading (Cio(OFF) = 4 pF typ), and 5-V-tolerant I/Os-functional whether VCC is powered (2.3–3.6 V) or fully off. 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 Operating Range | 2.3 V to 3.6 V - supports both 2.5-V and 3.3-V system rails with single supply |
| ON-State Resistance (ron) | 5 Ω typical - ensures minimal voltage drop and signal attenuation across full 0–5-V swing |
| Propagation Delay (tpd) | 0.18–0.3 ns - enables timing-critical high-speed data paths up to 500 MHz |
| I/O Capacitance (Cio(OFF)) | 4 pF typical - reduces bus loading and preserves signal integrity in multi-drop configurations |
| OE Toggle Frequency (fOE) | 20 MHz max - allows rapid channel switching for dynamic bus arbitration |
| Supply Current (ICC) | 1 mA typical - ultra-low static power for always-on signal gating applications |
| Signal Voltage Range | 0–5.5 V on I/O ports - interoperable with 0.8-V to 5-V logic families without external level shifters |
Pinout & Package
SN74CB3Q16245DLR is housed in a 48-pin SSOP (Shrink Small Outline Package) with 0.5-mm pitch, 12.6 mm × 6.2 mm body, and 1.2-mm max height per JEDEC MO-153. Pin 1 is located at top-left corner (quadrant Q1), with no internal connection on pins 1 and 48.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1A1–1A8, 2A1–2A8 | Input/Output Port A (Channel 1 & 2) | Bidirectional data terminals connected to upstream logic/memory; tolerate 0–5.5 V |
| 1B1–1B8, 2B1–2B8 | Input/Output Port B (Channel 1 & 2) | Bidirectional data terminals connected to downstream bus/peripheral; 5-V tolerant |
| 1OE, 2OE | Channel Enable Inputs | Active-low controls: OE = L enables A↔B conduction; OE = H isolates ports into high-Z |
| VCC | Power Supply | 2.3–3.6 V core supply; powers internal charge pump for gate voltage boosting |
| GND | Ground Reference | Common return for all signal and power paths; 10 pins distributed for low-noise operation |
| NC (Pins 1, 48) | No Internal Connection | Unbonded pads - must be left floating or tied to GND for mechanical stability only |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail analog/digital switching | Supports 0–5-V signals at 3.3-V VCC - eliminates need for external level translators in mixed-voltage systems |
| Ioff partial-power-down protection | Blocks backflow current when VCC = 0 - prevents damage during hot-insertion or staggered power sequencing |
| Charge-pump gate drive | Maintains flat 5-Ω ron across full input voltage range - ensures consistent timing and amplitude response |
| Low OFF-state I/O capacitance | 4 pF typical - minimizes crosstalk and signal distortion in high-speed parallel buses |
| 5-V tolerant control inputs | Accepts TTL or 3.3-V/5-V CMOS logic levels on OE - simplifies interface with legacy or mixed-supply controllers |
Applications
| PCI Bus Isolation | Memory Interleaving Interface |
|---|---|
Use Scenario: Isolating PCI Express lanes or legacy PCI segments to prevent ground loops and noise coupling between add-in cards and motherboard. IC Role / Device Role / Timing Role: Bidirectional signal gate placed between PCI slot and bridge controller; enables/disables data path under software control. Use Value: 4-pF OFF-state capacitance prevents signal degradation; 500-MHz bandwidth preserves PCIe Gen1/Gen2 eye diagrams; Ioff protects during hot-plug events. |
Use Scenario: Routing address/data between two DDR memory banks controlled by a single memory controller in interleaved mode. IC Role / Device Role / Timing Role: Low-latency 16-bit data switch that toggles between Bank A and Bank B based on address MSB; replaces discrete muxes. Use Value: 0.3-ns max tpd avoids timing closure issues; rail-to-rail 0–3.3-V switching matches DDR I/O voltage; 5-Ω ron minimizes skew across DQ lines. |
| Differential Signal Pair Gating | Low-Distortion Test Equipment Interface |
Use Scenario: Enabling/disabling LVDS or RSDS differential pairs in automated test equipment where signal integrity must be preserved during idle states. IC Role / Device Role / Timing Role: Dual-channel FET switch placed inline with each differential pair; OE synchronized to test pattern generator. Use Value: Matched ron and Cio across A/B ports ensure common-mode rejection; 5-V tolerance accommodates test head voltage margins. |
Use Scenario: Connecting FPGA I/O banks to multiple instrument front-ends (oscilloscope, logic analyzer, signal generator) via shared probe points. IC Role / Device Role / Timing Role: Reconfigurable 16-bit signal router that isolates unused instruments to reduce loading and crosstalk. Use Value: 1 mA ICC enables always-on readiness; 20-MHz fOE supports rapid test mode switching; SSOP-48 footprint fits dense instrumentation PCBs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar FET bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBT16245DLR | Higher ron (7 Ω typ), no charge pump, 3.3-V only VCC range (4.5–5.5 V not supported) | Limited to 3.3-V-only systems; cannot support 0–5-V rail-to-rail switching | Select when cost sensitivity outweighs 5-V tolerance and ultra-low ron requirements |
| SN74LVC16245ADLR | CMOS-based transceiver (not FET switch); higher Cio(OFF) (12 pF), unidirectional with direction control | Requires direction pin and level-shifting for bidirectional 5-V signaling; adds timing overhead | Choose only if strict 3.3-V logic compatibility and direction-controlled buffering are required |
Compared with SN74CB3Q16245DLR, SN74CBT16245DLR trades 5-V tolerance and flat ron for lower unit cost, while SN74LVC16245ADLR replaces passive FET gating with active CMOS buffering-introducing direction latency and higher capacitive loading unsuitable for high-fidelity analog signal routing.
Availability
SN74CB3Q16245DLR is available at Aetrix Electronics and suitable for PCI interface design, memory subsystem routing, differential signal gating, and test equipment signal management requiring stable component supply across industrial temperature ranges (–40°C to +85°C).
Supply support for SN74CB3Q16245DLR 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 SN74CB3Q16245DLR belongs to TI's Widebus™ family of high-bandwidth FET switches, engineered specifically for low-distortion, low-latency signal routing in broadband communications, networking infrastructure, and data-intensive computing platforms.
FAQ
What is the maximum signal frequency supported by the SN74CB3Q16245DLR?
The SN74CB3Q16245DLR supports signal bandwidths up to 500 MHz, verified by its low 5-Ω typical ON-state resistance and 4-pF OFF-state I/O capacitance. This performance enables clean signal transmission in high-speed digital interfaces such as PCI and memory bus applications without significant rise-time degradation or jitter accumulation.
Does the SN74CB3Q16245DLR support 5-V tolerant I/O when VCC is powered down?
Yes, the SN74CB3Q16245DLR maintains 5-V tolerance on all I/O ports (A and B) regardless of VCC state-whether powered at 2.3–3.6 V or fully at 0 V. This is enabled by its Ioff circuitry and robust clamp diodes, making it safe for hot-swap and partial-power-down system architectures.
Can the SN74CB3Q16245DLR be used for analog signal switching?
Yes, the SN74CB3Q16245DLR is explicitly qualified for both digital and analog applications-including differential signal interfaces and low-distortion gating-due to its rail-to-rail 0–5-V switching capability, flat ron, and low Cio(OFF). Its FET architecture avoids CMOS threshold limitations, preserving analog waveform fidelity.
What is the recommended pull-up resistor value for OE pins on the SN74CB3Q16245DLR?
TI recommends tying OE pins to VCC through a pull-up resistor to ensure high-impedance state during power-up/down. The minimum value depends on the driver's current-sinking capability; for standard CMOS drivers, 4.7 kΩ to 10 kΩ is typical. Lower values improve noise immunity but increase static current draw.
Is the SN74CB3Q16245DLR RoHS compliant and lead-free?
Yes, the SN74CB3Q16245DLR is RoHS compliant and features a green (RoHS & no Sb/Br) eco plan with NiPdAu (NIPDAU) lead finish. It carries JEDEC MSL Level-1 rating (260°C peak reflow, unlimited floor life) and is qualified for industrial temperature operation (–40°C to +85°C).
SN74CB3Q16245DLR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CB
- Package/Case:
- 48-BSSOP (0.295", 7.50mm 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-SSOP
SN74CB3Q16245DLR FAQ
1.How can I place an order for SN74CB3Q16245DLR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CB3Q16245DLR 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 SN74CB3Q16245DLR reliable?
The price and inventory of SN74CB3Q16245DLR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CB3Q16245DLR is usually 5 days.
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Once your SN74CB3Q16245DLR 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 SN74CB3Q16245DLR?
For technical support, including SN74CB3Q16245DLR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CB3Q16245DLR requirements.
6.How does Aetrix verify that SN74CB3Q16245DLR is sourced from the original manufacturer or authorized distributors?
All SN74CB3Q16245DLR 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 SN74CB3Q16245DLR meets industry standards.
7.What is the process for return or replacement of SN74CB3Q16245DLR?
All SN74CB3Q16245DLR units undergo pre-shipment inspection (PSI). If there is an issue with SN74CB3Q16245DLR, 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 SN74CB3Q16245DLR part is unused and in its original packaging.
Return procedure for SN74CB3Q16245DLR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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