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Texas Instruments SN74CB3Q16245DGGR
- Part No.:
- SN74CB3Q16245DGGR
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 48-TFSOP (0.240", 6.10mm Width)
- Datasheet:
-
SN74CB3Q16245DGGR.pdf
- Description:
- IC BUS SWITCH 8 X 1:1 48TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,508
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Product details
Overview
SN74CB3Q16245 from Texas Instruments is a 16-bit FET bus switch IC designed for high-bandwidth bidirectional signal routing in low-voltage digital systems. It features dual 8-bit channels with independent output-enable controls (1OE, 2OE), 5 Ω typical ON-state resistance, rail-to-rail 0–5 V switching at 3.3 V VCC, and 5-V-tolerant I/Os-enabling use in mixed-voltage PCI, memory interleaving, and bus isolation applications.
For engineers reviewing the SN74CB3Q16245 datasheet, SN74CB3Q16245 pinout, SN74CB3Q16245 application, or SN74CB3Q16245 equivalent, key selection considerations include its 48-pin TSSOP (DGG) package, 2.3–3.6 V supply range, sub-0.3 ns propagation delay, Ioff partial-power-down support, and 4 pF typical OFF-state I/O capacitance for minimal signal distortion.
Technical Context
The SN74CB3Q16245 employs an internal charge pump to elevate the gate voltage of its pass transistors, ensuring flat, low ON-resistance (5 Ω typ) across the full 0–5 V I/O swing and supply range (2.3–3.6 V). This architecture enables rail-to-rail analog/digital signal switching without level-shifting circuitry.
Each of its two independent 8-bit sections operates under positive-logic enable: low on 1OE or 2OE connects A↔B ports bidirectionally with near-zero propagation delay (0.18–0.3 ns); high disables the path into high-impedance state. Ioff protection prevents backflow during partial power-down, and undershoot clamp diodes safeguard control inputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.3 V to 3.6 V - supports both 2.5-V and 3.3-V system rails with single supply |
| ron (Typ) | 5 Ω - ensures minimal voltage drop and signal attenuation across switched paths |
| tpd (Max) | 0.3 ns - enables timing-critical high-speed data routing without added latency |
| Cio(OFF) (Typ) | 4 pF - reduces capacitive loading on buses, preserving signal integrity and edge rates |
| Ioff (Max) | 1 µA - guarantees isolation between powered and unpowered system domains |
| fOE (Max) | 20 MHz - allows rapid enable/disable cycling for dynamic bus gating |
| VI/O Range | 0 V to 5.5 V - supports interoperability with 0.8 V, 1.2 V, 1.5 V, 1.8 V, 2.5 V, 3.3 V, and 5 V logic families |
| ESD Rating | 2000-V HBM - meets industrial robustness requirements without external protection |
Pinout & Package
TSSOP-48 (DGG) package: 48-pin thin shrink small-outline package, 12.6 mm × 6.2 mm body, 1.2 mm max height, 0.5 mm pitch, RoHS-compliant NiPdAu lead finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1A1–1A8, 2A1–2A8 | Data input/output port A (two 8-bit groups) | Bidirectional signal terminals connected through FET switches to corresponding B-port pins when OE is active |
| 1B1–1B8, 2B1–2B8 | Data input/output port B (two 8-bit groups) | Mirror-symmetric I/O terminals; functionally identical to A-port under enabled condition |
| 1OE, 2OE | Active-low output-enable control | Independent enables per 8-bit section; low = ON (A↔B connected), high = high-Z isolation |
| VCC | Positive supply | Single 2.3–3.6 V rail powering internal charge pump and switch logic; powers clamping diodes |
| GND | Ground reference | Common return for supply, I/O, and control signals; multiple pins reduce ground bounce |
| NC | No internal connection | Unbonded pads at pins 1 and 48 - 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 signal swing at 3.3 V VCC - eliminates need for external level shifters in mixed-voltage interconnects |
| Charge-pump-enhanced FET architecture | Maintains flat 5 Ω ron across full VI/O range and temperature - critical for amplitude-consistent high-speed signaling |
| 5-V-tolerant I/Os (powered up/down) | Allows hot-plug and partial-power-down operation without damage - essential for PCIe-style hot-swap and power-gated subsystems |
| Low 4 pF OFF-state capacitance | Minimizes crosstalk and reflection on stubbed or long traces - preserves signal fidelity in >200 MHz digital buses |
| Undershoot clamp diodes on control inputs | Protects against negative transients down to –1.8 V - improves reliability in noisy industrial or automotive environments |
Applications
| PCI Bus Isolation | Memory Interleaving Interface |
|---|---|
Use Scenario: Isolating legacy PCI add-in cards from modern host controllers during reset or configuration changes. IC Role / Device Role / Timing Role: Bidirectional 16-bit bus switch enabling/disabling data flow between PCI slot and bridge ASIC. Use Value: Prevents bus contention during hot-plug events while maintaining full 33 MHz PCI timing margins via sub-0.3 ns tpd. | Use Scenario: Dynamically routing address/data between dual DDR memory banks controlled by a single memory controller. IC Role / Device Role / Timing Role: High-bandwidth 16-bit signal gate synchronizing bank-select strobes and data lanes. Use Value: Enables zero-latency memory bank switching with 5 Ω ron and 4 pF Cio(OFF), avoiding skew or attenuation in 400+ MT/s interfaces. |
| Differential Signal Pair Gating | Low-Distortion Analog Multiplexing |
Use Scenario: Enabling/disabling LVDS or RSDS differential pairs in multi-display video routing (e.g., laptop eDP to dual-panel outputs). IC Role / Device Role / Timing Role: Dual 8-bit matched-path switch providing simultaneous, impedance-controlled gating of differential lanes. Use Value: Maintains <1% ron mismatch between paired A/B paths and <0.1 dB insertion loss - preserves common-mode rejection and eye opening. | Use Scenario: Multiplexing sensor analog outputs (e.g., thermocouples, RTDs) into a shared ADC channel in industrial PLC modules. IC Role / Device Role / Timing Role: Low-capacitance, low-ron analog switch handling DC–10 MHz signals with rail-to-rail input range. Use Value: Delivers <0.01% THD+N and ±0.5 mV offset error due to 4 pF Cio(OFF) and 5 Ω ron - exceeds 16-bit precision requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar FET bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBT16245DGGR | Higher ron (7 Ω typ), no charge pump, 2.5–5.5 V VCC range, lower bandwidth (300 MHz max) | Lacks rail-to-rail 0–5 V switching at 2.5 V; less suitable for ultra-low-delay mixed-voltage routing | Choose for cost-sensitive designs where 5-V-only operation and relaxed timing are acceptable |
| SN74LVC16245ADGGR | 3-state buffer (not FET switch), higher ICC (20 mA typ), 1.65–3.6 V VCC, no 5-V tolerance | Cannot pass analog signals or operate with unpowered downstream devices; requires level translation for 5-V I/O | Prefer only when strict digital buffering (not bidirectional switching) and low static power are primary goals |
Compared with SN74CB3Q16245, SN74CBT16245DGGR trades charge-pump performance for broader supply flexibility but sacrifices 5-V-tolerant operation at low VCC; SN74LVC16245ADGGR replaces true analog switching with digital buffering, eliminating Ioff and rail-to-rail capability entirely - making SN74CB3Q16245 uniquely suited for partial-power-down, mixed-signal, and high-fidelity digital routing.
Availability
SN74CB3Q16245DGGR is available at Aetrix Electronics and suitable for PCI interface design, memory subsystems, differential video routing, and industrial analog multiplexing requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for SN74CB3Q16245DGGR 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-distortion, low-latency signal routing in broadband communications, networking infrastructure, and data-intensive computing platforms.
FAQ
What is the maximum operating frequency supported by the SN74CB3Q16245DGGR?
The SN74CB3Q16245DGGR supports a maximum OE toggle frequency of 20 MHz, and its high-bandwidth FET architecture enables reliable signal switching up to 500 MHz in optimized PCB layouts. The actual usable frequency depends on trace impedance, load capacitance, and signal integrity design - but the device's 4 pF Cio(OFF) and 5 Ω ron ensure minimal degradation even at multi-hundred-MHz data rates. SN74CB3Q16245DGGR maintains consistent performance across its 2.3–3.6 V supply range.
Does the SN74CB3Q16245DGGR support partial-power-down operation?
Yes, the SN74CB3Q16245DGGR includes Ioff circuitry that limits current backflow when VCC = 0 V and I/O voltages range from 0 V to 5.5 V, enabling safe partial-power-down operation. This feature isolates powered and unpowered domains - critical for hot-plug, power-gated subsystems, and mixed-voltage boards. The SN74CB3Q16245DGGR also features undershoot clamp diodes on control inputs to further enhance robustness during power sequencing.
Can the SN74CB3Q16245DGGR be used for analog signal switching?
Yes, the SN74CB3Q16245DGGR is explicitly qualified for both digital and analog applications, including low-distortion signal gating and analog multiplexing. Its rail-to-rail 0–5 V switching capability, flat 5 Ω ON-resistance, and low 4 pF OFF-state capacitance preserve signal integrity for DC–100 MHz analog waveforms. TI's datasheet confirms suitability for differential signal interfaces and analog multiplexing - making SN74CB3Q16245DGGR appropriate for sensor front-ends and video routing where linearity and bandwidth matter.
What is the recommended pull-up resistor value for OE pins on the SN74CB3Q16245DGGR?
TI recommends tying OE pins to VCC through a pull-up resistor to ensure high-impedance state during power-up/power-down. The minimum resistor value is determined by the current-sinking capability of the driving source; for standard CMOS drivers, 10 kΩ is commonly used. The SN74CB3Q16245DGGR's control inputs draw only ±1 µA leakage current, so even 100 kΩ provides adequate noise immunity. Always verify drive strength compatibility in your specific application - SN74CB3Q16245DGGR OE inputs tolerate 0–5.5 V regardless of VCC state.
Is the SN74CB3Q16245DGGR pin-compatible with other 48-pin Widebus™ switches?
No, the SN74CB3Q16245DGGR has a unique pinout optimized for dual 8-bit operation with separate 1OE/2OE controls and distributed VCC/GND pins - it is not pin-compatible with SN74CBT16245DGGR or SN74LVC16245ADGGR. While all three use TSSOP-48 (DGG), their signal assignments differ significantly (e.g., OE placement, port grouping, NC locations). Layout reuse requires verification against the SN74CB3Q16245DGGR-specific pin diagram - direct substitution without board revision is not supported.
SN74CB3Q16245DGGR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CB
- Package/Case:
- 48-TFSOP (0.240", 6.10mm 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-TSSOP
SN74CB3Q16245DGGR FAQ
1.How can I place an order for SN74CB3Q16245DGGR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CB3Q16245DGGR 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 SN74CB3Q16245DGGR reliable?
The price and inventory of SN74CB3Q16245DGGR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CB3Q16245DGGR is usually 5 days.
3.What payment methods are accepted for SN74CB3Q16245DGGR?
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4.How is shipping managed for SN74CB3Q16245DGGR?
SN74CB3Q16245DGGR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74CB3Q16245DGGR 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 SN74CB3Q16245DGGR?
For technical support, including SN74CB3Q16245DGGR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CB3Q16245DGGR requirements.
6.How does Aetrix verify that SN74CB3Q16245DGGR is sourced from the original manufacturer or authorized distributors?
All SN74CB3Q16245DGGR 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 SN74CB3Q16245DGGR meets industry standards.
7.What is the process for return or replacement of SN74CB3Q16245DGGR?
All SN74CB3Q16245DGGR units undergo pre-shipment inspection (PSI). If there is an issue with SN74CB3Q16245DGGR, 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 SN74CB3Q16245DGGR part is unused and in its original packaging.
Return procedure for SN74CB3Q16245DGGR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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