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Texas Instruments SN74CB3Q16245DL
- Part No.:
- SN74CB3Q16245DL
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 48-BSSOP (0.295", 7.50mm Width)
- Datasheet:
-
SN74CB3Q16245DL.pdf
- Description:
- IC BUS SWITCH 8 X 1:1 48SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,512
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Product details
Overview
SN74CB3Q16245DL 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, featuring 5-Ω typical ON-state resistance, 500-MHz bandwidth support, rail-to-rail 0–5-V switching capability, and bidirectional zero-delay data flow - deployed in PCI interface isolation and memory interleaving subsystems.
For engineers reviewing the SN74CB3Q16245DL datasheet, SN74CB3Q16245DL pinout, SN74CB3Q16245DL application, or SN74CB3Q16245DL equivalent, this page delivers verified electrical parameters, SSOP-48 package mapping, functional pin roles, real-world use cases, and two validated alternative parts with documented technical and application differences.
Technical Context
The SN74CB3Q16245DL implements a charge-pump-enhanced FET architecture to maintain flat, low ON-resistance (5 Ω typ) across its 16-channel bidirectional switch array, enabling sub-0.3 ns propagation delay and minimal signal distortion. Its Ioff circuitry ensures robust partial-power-down operation with <1 µA leakage when VCC = 0 V.
Each of the two independent 8-bit sections features dedicated OE control (1OE/2OE), supporting flexible configuration as either dual 8-bit or single 16-bit switches. The device accepts 0–5-V signaling on I/O ports while powered from 2.3–3.6 V, and tolerates 5-V inputs regardless of power state.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.3 V to 3.6 V - Enables compatibility with both 2.5-V and 3.3-V logic domains without level translation. |
| ron (Typ) | 5 Ω - Ensures minimal voltage drop and signal attenuation during high-speed data transfer. |
| Bandwidth | Up to 500 MHz - Supports high-frequency applications including DDR memory buses and PCIe sideband routing. |
| tpd (Max) | 0.3 ns - Delivers near-zero propagation delay for timing-critical interconnect paths. |
| Cio(OFF) (Typ) | 4 pF - Reduces capacitive loading on driven buses, preserving signal integrity and edge rate. |
| Ioff (Max) | 1 µA at VCC = 0 V - Guarantees isolation and prevents backflow current during system power sequencing. |
| fOE (Max) | 20 MHz - Allows fast enable/disable cycling for dynamic bus gating in burst-mode protocols. |
| VI/O Range | 0 V to 5.5 V - Permits interoperability with legacy 5-V peripherals and mixed-voltage SoC interfaces. |
Pinout & Package
SN74CB3Q16245DL is housed in a 48-pin SSOP (Shrink Small-Outline Package) with 0.5-mm pitch, 12.6 mm × 6.2 mm body size, and 1.2-mm max height - compliant with JEDEC MO-153 and optimized for space-constrained PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1A1–1A8, 2A1–2A8 | Data input/output port A (two 8-bit groups) | Bidirectional signal path connected to B-port when OE is active low; high-impedance when disabled. |
| 1B1–1B8, 2B1–2B8 | Data input/output port B (two 8-bit groups) | Complementary bidirectional path to A-port; supports rail-to-rail 0–5-V signal pass-through. |
| 1OE, 2OE | Output-enable control inputs (active-low) | Independent enables for each 8-bit section; must be pulled up to VCC for defined power-up state. |
| VCC | Supply voltage (2.3–3.6 V) | Power source for internal charge pump and logic; powers all switch channels and control circuitry. |
| GND | Ground reference | Common return path for supply and signal currents; multiple pins reduce ground bounce in high-speed operation. |
| NC | No internal connection | Unbonded pins at positions 1 and 48 - omitted from routing and thermal design considerations. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail analog/digital switching | Supports 0–5-V signals with 2.5-V or 3.3-V VCC - eliminates need for external level shifters in mixed-voltage systems. |
| Charge-pump gate drive | Elevates FET gate voltage above VCC to sustain low, flat ron over full voltage range - critical for consistent timing performance. |
| 5-V tolerant I/Os | Accepts 5-V inputs with device powered up or fully powered down - enables hot-plug and safe power sequencing. |
| Partial-power-down support (Ioff) | Blocks current flow between A/B ports when VCC = 0 V - protects downstream circuitry during standby or fault conditions. |
| Low OFF-state capacitance | 4 pF typical Cio(OFF) minimizes stub loading on high-speed buses, preserving signal rise/fall times and reducing crosstalk. |
Applications
| PCI Bus Isolation | Differential Signal Interface |
|---|---|
Use Scenario: Isolating legacy PCI slots from shared system address/data buses during hot-swap or power management events. IC Role / Device Role / Timing Role: Bidirectional 16-bit bus switch providing galvanic separation and signal integrity preservation between host and peripheral. Use Value: Enables clean bus disconnection with <0.3 ns delay and no level-shifter overhead, meeting PCI specification timing margins. |
Use Scenario: Gating LVDS or RSDS differential pairs in FPGA-to-ASIC interconnects where dynamic channel enable/disable is required. IC Role / Device Role / Timing Role: Low-capacitance, low-distortion analog switch maintaining differential pair impedance and skew balance. Use Value: 4 pF Cio(OFF) and 5 Ω ron preserve signal fidelity and minimize jitter accumulation across multi-Gbps links. |
| Memory Interleaving | High-Speed Bus Arbitration |
Use Scenario: Dynamically routing memory address and data lines between dual-channel DDR controllers and shared SDRAM banks. IC Role / Device Role / Timing Role: 16-bit bidirectional switch acting as a configurable data path multiplexer with sub-nanosecond latency. Use Value: 500-MHz bandwidth and rail-to-rail 0–3.3-V switching ensure full compliance with DDR2/DDR3 timing windows. |
Use Scenario: Enabling/disabling peripheral access to a shared system bus based on arbitration logic in industrial PLC backplanes. IC Role / Device Role / Timing Role: Fast-switching bus gate controlled by real-time priority signals to prevent bus contention. Use Value: 20-MHz fOE and 1.5–7 ns enable/disable times allow precise cycle-level bus ownership handover. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar FET bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBT16245DL | Higher ron (7 Ω typ), no charge pump, 3.3-V only supply (4.5–5.5 V not supported), lower bandwidth (~300 MHz). | Limited to 3.3-V-only systems; unsuitable for 2.5-V operation or 0–5-V mixed signaling. | Select when cost sensitivity outweighs performance needs and system operates strictly at 3.3 V. |
| SN74LVC16245ADLR | CMOS-based transceiver (not FET switch); higher propagation delay (>3 ns), higher capacitance (>10 pF), no 5-V tolerance on I/Os. | Requires external level shifting for 5-V interfacing; introduces measurable timing skew in high-speed paths. | Choose only for low-frequency control-bus applications where voltage translation is handled elsewhere. |
Compared with SN74CB3Q16245DL, SN74CBT16245DL trades bandwidth and voltage flexibility for lower cost, while SN74LVC16245ADLR replaces FET-switch advantages with CMOS logic-level translation - making SN74CB3Q16245DL uniquely suited for high-fidelity, mixed-voltage, nanosecond-critical signal routing.
Availability
SN74CB3Q16245DL is available at Aetrix Electronics and suitable for PCI interface isolation, memory interleaving, differential signal gating, and high-speed bus arbitration requiring stable component supply across industrial, communications, and embedded computing programs.
Supply support for SN74CB3Q16245DL 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 logic and interface solutions.
The SN74CB3Q16245DL belongs to TI's Widebus™ family of high-speed FET bus switches, engineered specifically for low-distortion, rail-to-rail signal routing in broadband communications, networking infrastructure, and data-intensive computing platforms.
FAQ
What is the maximum operating frequency supported by the SN74CB3Q16245DL?
The SN74CB3Q16245DL supports signal bandwidth up to 500 MHz, verified via characterization of its low 5-Ω ON-state resistance and 4-pF OFF-state capacitance. This enables reliable operation in DDR2/DDR3 memory buses and high-speed serial sideband applications - though actual system-level frequency depends on PCB layout, termination, and load capacitance.
Does the SN74CB3Q16245DL support 5-V tolerant I/Os when unpowered?
Yes, the SN74CB3Q16245DL maintains 5-V tolerance on all data I/O pins (A and B ports) whether powered up or fully powered down (VCC = 0 V). This is enabled by internal clamp diodes and Ioff protection circuitry, allowing safe connection to live 5-V buses during hot-swap or partial-power-down sequences.
Can the SN74CB3Q16245DL be used in analog signal switching applications?
Yes, the SN74CB3Q16245DL is explicitly qualified for both digital and analog use cases, including differential signal interfaces and low-distortion signal gating. Its rail-to-rail 0–5-V switching range, flat ron, and low Cio(OFF) make it suitable for passing analog waveforms such as LVDS, RSDS, or clock signals without amplitude compression or phase distortion.
What is the recommended power-up sequence for the SN74CB3Q16245DL?
To ensure high-impedance state at power-up, tie 1OE and 2OE to VCC through pullup resistors (minimum value determined by driver sink capability). VCC should be applied before or concurrently with I/O signals; no strict sequencing is required between VCC and OE, but OE must not float - undefined states may cause momentary bus contention.
Is the SN74CB3Q16245DL RoHS-compliant and lead-free?
Yes, the SN74CB3Q16245DL is RoHS-compliant and features a green (RoHS & no Sb/Br) material set with NiPdAu lead finish. It carries JEDEC MSL Level-1 rating (260°C peak reflow, unlimited floor life) and is qualified for industrial temperature range (–40°C to +85°C).
SN74CB3Q16245DL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CB
- Package/Case:
- 48-BSSOP (0.295", 7.50mm Width)
- Packaging:
- Bulk
- 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
SN74CB3Q16245DL FAQ
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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 SN74CB3Q16245DL?
For technical support, including SN74CB3Q16245DL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CB3Q16245DL requirements.
6.How does Aetrix verify that SN74CB3Q16245DL is sourced from the original manufacturer or authorized distributors?
All SN74CB3Q16245DL 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 SN74CB3Q16245DL meets industry standards.
7.What is the process for return or replacement of SN74CB3Q16245DL?
All SN74CB3Q16245DL units undergo pre-shipment inspection (PSI). If there is an issue with SN74CB3Q16245DL, 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 SN74CB3Q16245DL part is unused and in its original packaging.
Return procedure for SN74CB3Q16245DL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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