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Texas Instruments SN74CB3Q16244DLR
- Part No.:
- SN74CB3Q16244DLR
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 48-BSSOP (0.295", 7.50mm Width)
- Datasheet:
-
SN74CB3Q16244DLR.pdf
- Description:
- IC BUS SWITCH 4 X 1:1 48SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,208
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Product details
Overview
SN74CB3Q16244DLR from Texas Instruments is a 16-bit FET bus switch IC with four independent 4-bit channels, 5-V tolerant I/Os, 5 Ω typical ON-state resistance (ron), rail-to-rail 0–5 V switching at 3.3 V VCC, and 20 MHz maximum OE switching frequency. It enables bidirectional signal routing in high-bandwidth data paths for optical networking and wireless infrastructure equipment.
For engineers reviewing the SN74CB3Q16244DLR datasheet, SN74CB3Q16244DLR pinout, SN74CB3Q16244DLR application, or SN74CB3Q16244DLR equivalent, key selection considerations include its partial-power-down Ioff support, 4 pF typical OFF-state I/O capacitance, flat ron over 2.3–3.6 V VCC, bidirectional zero-propagation-delay operation, and SSOP-48 package compatibility with legacy board layouts.
Technical Context
The SN74CB3Q16244DLR integrates a charge-pump circuit to elevate the gate voltage of internal pass FETs, enabling low and flat ON-state resistance across its full 2.3–3.6 V supply range. Each of its four OE inputs controls a dedicated 4-bit channel, supporting configurable 4-, 8-, or 16-bit bus switching.
It features undershoot clamp diodes on all data and control I/Os, supports 0–5 V signaling regardless of VCC (2.5 V or 3.3 V), and guarantees isolation during power-down via Ioff circuitry that limits backflow current to 1 µA at VCC = 0 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.3 V to 3.6 V - Enables interoperability with 2.5 V and 3.3 V logic domains while maintaining 5 V I/O tolerance. |
| ron (Typical) | 5 Ω - Ensures minimal signal attenuation and near-zero propagation delay (<0.3 ns) in high-speed data paths. |
| Cio(OFF) | 4 pF typical - Reduces capacitive loading on source and destination buses, preserving signal integrity up to 500 MHz. |
| fOE (Max) | 20 MHz - Supports fast enable/disable cycling for dynamic bus resource allocation in time-critical systems. |
| Ioff | 1 µA at VCC = 0 V - Enables safe partial-power-down operation without risk of damaging back-current into powered-down sections. |
| VI/O Tolerance | 0 to 5.5 V - Allows connection to mixed-voltage systems (e.g., 1.8 V/3.3 V controllers driving 5 V peripherals) without level shifters. |
| ESD Rating | ±2000 V HBM - Meets industrial-grade robustness requirements for handling and board assembly environments. |
Pinout & Package
SN74CB3Q16244DLR is housed in a 48-pin SSOP (Shrink Small Outline Package) with 15.88 mm × 7.49 mm body size, 0.635 mm lead pitch, and surface-mount gull-wing leads. The package supports standard reflow profiles (MSL Level-1, peak 260 °C) and includes four VCC (pins 7, 18, 31, 42) and four GND (pins 4, 10, 15, 21) terminals for low-noise power distribution.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE, 3OE, 4OE | Active-low channel enable inputs | Each independently controls conduction between its associated A/B 4-bit port pair; pulled high via resistor for power-up high-impedance safety. |
| 1A1–1A4, 1B1–1B4 | Bidirectional switched I/O pairs (Channel 1) | Low-capacitance, 5-V-tolerant paths with matched ron; no direction pin required due to true bidirectional FET architecture. |
| 2A1–2A4, 2B1–2B4 | Bidirectional switched I/O pairs (Channel 2) | Electrically isolated from Channel 1; supports independent timing and voltage domain bridging. |
| 3A1–3A4, 3B1–3B4 | Bidirectional switched I/O pairs (Channel 3) | Same electrical specs as Channels 1–2; enables 12-bit expansion or segmented bus isolation. |
| 4A1–4A4, 4B1–4B4 | Bidirectional switched I/O pairs (Channel 4) | Completes 16-bit configuration; all A/B ports share identical 4 pF Cio(OFF) and 5 Ω ron characteristics. |
| VCC (×4) | Power supply inputs | Distributed VCC pins reduce IR drop and improve high-frequency decoupling; each requires local 0.022 µF bypass capacitor. |
| GND (×4) | Ground return terminals | Multiple GND pins minimize ground bounce and maintain reference stability across high-speed switching events. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail 0–5 V switching | Operates with 3.3 V VCC while passing full 0–5 V signals - eliminates need for external level translators in mixed-voltage interconnects. |
| Charge-pump enhanced FET gate drive | Maintains flat 5 Ω ron across entire 2.3–3.6 V VCC range - ensures consistent timing and impedance matching in variable-supply systems. |
| 4 pF typical OFF-state I/O capacitance | Minimizes bus loading and signal distortion during channel disable - critical for preserving eye diagram integrity in >200 MHz serial links. |
| Partial-power-down Ioff support | Blocks back-current flow when VCC = 0 V - enables hot-swap capability and safe integration into modular power-rail architectures. |
| Undershoot clamp diodes | Integrated protection on all I/Os - prevents negative transients below –1.8 V from damaging downstream receivers or violating input absolute max ratings. |
Applications
| Optical Networking Backplane | WiMAX Baseband Interface |
|---|---|
|
Use Scenario: Routing 16-bit parallel video or control data between FPGA-based line cards and optical transceivers in EPON OLT chassis. IC Role / Device Role / Timing Role: Bidirectional bus switch isolating hot-swappable modules while maintaining sub-nanosecond timing alignment across all 16 lanes. Use Value: 5 Ω ron and 4 pF Cio(OFF) preserve signal rise/fall times and jitter margin under 500 MHz bandwidth requirements. |
Use Scenario: Interfacing baseband processor GPIOs to RF front-end calibration DACs and ADCs operating at different supply voltages. IC Role / Device Role / Timing Role: Voltage-level agnostic signal path enabling 1.8 V processor I/Os to safely drive 3.3 V analog components without level shifters. Use Value: 0–5 V I/O tolerance and 20 MHz fOE allow dynamic reconfiguration of RF calibration paths during system initialization. |
| IP Phone Audio Codec Bridge | PBX Digital Trunk Interface |
|
Use Scenario: Switching PCM audio data between multiple CODECs and DSP resources in multi-line VoIP handsets. IC Role / Device Role / Timing Role: Low-latency, bidirectional bus switch providing zero-propagation-delay signal routing between time-division multiplexed audio streams. Use Value: Near-zero tpd (<0.3 ns) and rail-to-rail operation prevent bit errors and clock skew in 8 kHz sampling systems. |
Use Scenario: Isolating digital trunk controller from legacy T1/E1 line interface units during firmware updates or fault conditions. IC Role / Device Role / Timing Role: High-isolation (ZOFF > 1 GΩ) bus switch enabling safe hot-swap of line cards without disrupting active calls on adjacent trunks. Use Value: Ioff < 1 µA at VCC = 0 V ensures no current leakage into powered-down LUs, meeting GR-1089 EMI and safety compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar FET bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBT16244DLR | Higher ron (7 Ω typical), no charge pump - results in greater VCC dependency and reduced 5 V tolerance margin. | Limited to ≤3.3 V signaling; unsuitable for 5 V-tolerant mixed-voltage bridges requiring guaranteed 0–5 V swing. | Select SN74CB3Q16244DLR when 5 V I/O tolerance, flat ron, or 500 MHz bandwidth is mandatory. |
| SN74LVC16244ADLR | CMOS buffer (not FET switch); higher Cio(ON) (15 pF), unidirectional, no Ioff, no 5 V tolerance. | Requires external direction control and level-shifting; cannot replace bidirectional, voltage-agnostic switching function. | Choose SN74CB3Q16244DLR where true bidirectionality, zero-propagation delay, and power-down isolation are required. |
Compared with SN74CBT16244DLR and SN74LVC16244ADLR, SN74CB3Q16244DLR uniquely delivers 5 V I/O tolerance with charge-pump-assisted flat ron, enabling single-chip bridging across 0.8–5 V logic families without external components or timing penalties.
Availability
SN74CB3Q16244DLR is available at Aetrix Electronics and suitable for optical networking backplanes, WiMAX baseband interfaces, and IP phone audio codec bridges requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant SSOP packaging.
Supply support for SN74CB3Q16244DLR 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 over 50 years of innovation in high-performance signal-path solutions.
SN74CB3Q16244DLR belongs to TI's CB3Q family of high-bandwidth FET bus switches, engineered specifically for broadband communications, optical networking, and wireless infrastructure where low-latency, voltage-agnostic signal routing is critical.
FAQ
What is the maximum signal frequency supported by SN74CB3Q16244DLR?
SN74CB3Q16244DLR supports signal paths up to 500 MHz, enabled by its 5 Ω typical ON-state resistance and 4 pF typical OFF-state I/O capacitance. This bandwidth is achievable with proper PCB layout, controlled impedance traces, and minimal stub lengths - verified in TI's application report SCDA008 for the CB3Q family.
Does SN74CB3Q16244DLR require external level shifters when interfacing 1.8 V and 5 V logic?
No, SN74CB3Q16244DLR does not require external level shifters. Its 0–5 V I/O tolerance allows direct connection between 1.8 V, 2.5 V, 3.3 V, and 5 V logic domains when powered from 2.3–3.6 V VCC. The device passes signals rail-to-rail without translation, as confirmed in Section 3 of the SCDS168A datasheet.
How does SN74CB3Q16244DLR behave during power-down sequences?
During power-down, SN74CB3Q16244DLR activates its Ioff circuitry, limiting back-current to ≤1 µA even when I/Os are driven at 5.5 V while VCC = 0 V. This prevents damage to upstream drivers and maintains isolation - a key requirement for hot-swap and partial-power-down systems per JESD78 Class II latch-up compliance.
Can SN74CB3Q16244DLR be used for analog signal switching?
Yes, SN74CB3Q16244DLR supports both digital and analog applications, as explicitly stated in its datasheet Feature section. Its low and flat ron, low Cio, and rail-to-rail operation make it suitable for low-distortion analog signal routing - including audio, sensor interfaces, and calibration paths - provided signal swing remains within 0–5.5 V.
What is the recommended bypass capacitor configuration for SN74CB3Q16244DLR?
TI recommends a 0.022 µF ceramic capacitor placed between each VCC pin (pins 7, 18, 31, 42) and the nearest GND pin (pins 4, 10, 15, 21). These capacitors must be mounted as close as possible to their respective pin pairs to suppress high-frequency noise and ensure stable switching performance, per Section 10.2.1 of the SCDS168A datasheet.
SN74CB3Q16244DLR 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:
- 4 x 1:1
- Independent Circuits:
- 4
- 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
SN74CB3Q16244DLR FAQ
1.How can I place an order for SN74CB3Q16244DLR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CB3Q16244DLR 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 SN74CB3Q16244DLR reliable?
The price and inventory of SN74CB3Q16244DLR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CB3Q16244DLR is usually 5 days.
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SN74CB3Q16244DLR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74CB3Q16244DLR 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 SN74CB3Q16244DLR?
For technical support, including SN74CB3Q16244DLR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CB3Q16244DLR requirements.
6.How does Aetrix verify that SN74CB3Q16244DLR is sourced from the original manufacturer or authorized distributors?
All SN74CB3Q16244DLR 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 SN74CB3Q16244DLR meets industry standards.
7.What is the process for return or replacement of SN74CB3Q16244DLR?
All SN74CB3Q16244DLR units undergo pre-shipment inspection (PSI). If there is an issue with SN74CB3Q16244DLR, 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 SN74CB3Q16244DLR part is unused and in its original packaging.
Return procedure for SN74CB3Q16244DLR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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