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Texas Instruments 74CB3Q16244DGGRG4
- Part No.:
- 74CB3Q16244DGGRG4
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 48-TFSOP (0.240", 6.10mm Width)
- Datasheet:
-
74CB3Q16244DGGRG4.pdf
- Description:
- IC BUS SWITCH 1 X 4:1 48TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,269
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Product details
Overview
74CB3Q16244DGGRG4 from Texas Instruments is a 16-bit FET bus switch 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-speed memory and data-path interconnects for optical networking and wireless infrastructure equipment.
For engineers reviewing the 74CB3Q16244DGGRG4 datasheet, 74CB3Q16244DGGRG4 pinout, 74CB3Q16244DGGRG4 application, or 74CB3Q16244DGGRG4 equivalent, this page delivers verified electrical specs, TSSOP-48 package mapping, functional mode behavior, real-world use cases, and two validated alternative parts - all grounded in TI's SCDS168A datasheet and official orderable addendum.
Technical Context
The 74CB3Q16244DGGRG4 implements a charge-pump-enhanced FET architecture to elevate gate voltage and maintain flat, low ron across 2.3–3.6-V VCC. Each of its four OE inputs controls a dedicated 4-bit bidirectional switch channel, supporting independent enable/disable timing with near-zero propagation delay (0.18 ns typical).
It features Ioff partial-power-down protection, undershoot clamp diodes on all data/control pins, and 4 pF typical OFF-state I/O capacitance - enabling hot-swap capability and minimal signal distortion in multi-voltage domain systems operating from 0.8 V to 5 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.3 V to 3.6 V - supports dual-supply system integration and compatibility with 2.5-V/3.3-V logic families. |
| ron (Typical) | 5 Ω - ensures minimal insertion loss and signal integrity up to 500 MHz bandwidth applications. |
| Cio(OFF) | 4 pF typical - reduces capacitive loading on high-speed buses and preserves edge rate fidelity. |
| fOE (Max) | 20 MHz - defines maximum toggle rate of output-enable control without violating timing margins. |
| VI/O Tolerance | 0 to 5.5 V - allows safe interfacing with legacy 5-V peripherals while powered from 2.5-V or 3.3-V rails. |
| tpd (Typical) | 0.18 ns - enables near-transparent signal pass-through with negligible latency in critical timing paths. |
| Ioff Leakage | 1 µA at VCC = 0 V - prevents back-current flow during partial power-down, protecting upstream drivers. |
Pinout & Package
TSSOP-48 package (12.50 mm × 6.10 mm body size), RoHS-compliant, NIPDAU lead finish, MSL Level-1, rated for –40°C to +85°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE, 3OE, 4OE | Active-low channel enable | Each independently controls one 4-bit switch group; low = A↔B path enabled, high = high-Z isolation. |
| 1A1–1A4, 1B1–1B4 | Bidirectional switched I/O pair | Four matched signal paths per channel; no direction pin - data flows freely in either direction when enabled. |
| VCC (Pins 7, 18, 31, 42) | Power supply | Four distributed VCC pins reduce IR drop and improve noise immunity; internally tied together. |
| GND (Pins 4, 10, 15, 21, 28, 34, 39, 45) | Ground reference | Eight GND pins provide low-inductance return paths for high-frequency switching currents. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail analog/digital switching | Supports 0–5-V signal levels at 3.3-V VCC - eliminates level-shifter requirements in mixed-voltage systems. |
| Charge-pump gate drive | Elevates FET gate voltage above VCC to sustain low, flat ron across full input voltage range and temperature. |
| Partial-power-down support (Ioff) | Blocks current flow between powered and unpowered domains - essential for hot-plug and modular backplane designs. |
| Low OFF-state capacitance | 4 pF typical Cio(OFF) minimizes crosstalk and stub reflections on high-speed parallel buses like DDR or PCIe sideband. |
| Undershoot clamp diodes | Integrated clamps protect against negative transients down to –1.8 V - improves robustness in noisy telecom environments. |
Applications
| Optical Networking Backplane | Wireless Baseband Interconnect |
|---|---|
Use Scenario: Routing 16-bit parallel control/data signals between FPGA and SFP+ module PHY interface in EPON OLT chassis. IC Role / Device Role / Timing Role: Bidirectional bus switch isolating hot-swappable optics while maintaining signal integrity across 0–3.3-V logic domains. Use Value: Enables seamless module replacement without powering down host FPGA; 5 Ω ron and 4 pF Cio(OFF) preserve eye diagram margin at 1.25 Gbps. |
Use Scenario: Dynamic reconfiguration of baseband IQ data paths between ADC/DAC and DSP in WiMAX remote radio head. IC Role / Device Role / Timing Role: Low-latency, low-distortion signal gate controlling RF calibration loopback paths under software control. Use Value: Near-zero tpd (0.18 ns) avoids timing skew in closed-loop calibration; 20 MHz fOE supports real-time path switching during burst transmission. |
| IP Phone Audio Bus Sharing | PBX System Expansion Slot |
Use Scenario: Time-multiplexing audio codec I²S lanes between multiple handset interfaces and single SoC audio controller. IC Role / Device Role / Timing Role: 4-channel 4-bit switch enabling shared access to stereo DAC/ADC resources across four VoIP ports. Use Value: 5-V tolerant I/Os interface directly with legacy analog line drivers; Ioff prevents ground-loop noise injection during port idle states. |
Use Scenario: Isolating expansion bus signals (address/data/control) between main PBX controller and optional T1/E1 interface card. IC Role / Device Role / Timing Role: High-bandwidth, low-capacitance switch providing clean signal coupling while supporting hot-insertion compliance. Use Value: 4 pF Cio(OFF) prevents signal degradation on 16-bit parallel expansion bus; MSL-1 rating ensures reliability in industrial reflow processes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBT16244DGGR | No charge pump; ron = 6 Ω typical, max fOE = 15 MHz, no Ioff support. | Lacks partial-power-down protection; unsuitable for hot-swap or mixed-power-domain systems. | Select when cost sensitivity outweighs Ioff need and 500-MHz bandwidth is not required. |
| SN74LVC16244ADGGR | CMOS buffer (not bus switch); non-bidirectional, 3.3-V only I/O, no 5-V tolerance. | Cannot replace bidirectional signal routing; requires external direction control and level translation. | Use only if application demands unidirectional buffering with TTL-compatible drive strength. |
Compared with SN74CBT16244DGGR and SN74LVC16244ADGGR, the 74CB3Q16244DGGRG4 uniquely combines 5-V I/O tolerance, Ioff-enabled hot-swap safety, and sub-0.2-ns propagation delay - making it the only option for high-reliability, multi-voltage, high-bandwidth bus gating in telecom infrastructure.
Availability
74CB3Q16244DGGRG4 is available at Aetrix Electronics and suitable for optical networking backplanes, wireless infrastructure baseband interconnects, and IP phone audio bus sharing requiring stable component supply across extended product lifecycles.
Supply support for 74CB3Q16244DGGRG4 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 90 years of innovation in industrial, automotive, and communications markets.
The CB3Q family - including the 74CB3Q16244DGGRG4 - was engineered specifically for high-bandwidth, low-distortion signal routing in broadband communications infrastructure where rail-to-rail switching, 5-V tolerance, and partial-power-down operation are mandatory.
FAQ
What is the maximum signal frequency supported by the 74CB3Q16244DGGRG4?
The 74CB3Q16244DGGRG4 supports signal paths up to 500 MHz, as confirmed by TI's characterization under high-bandwidth data path testing. This capability stems from its 5 Ω typical ON-state resistance and 4 pF OFF-state I/O capacitance, which jointly minimize RC time constants and preserve signal integrity. The 20 MHz fOE limit applies only to enable-control toggling - not data throughput.
Does the 74CB3Q16244DGGRG4 support hot-swap or partial-power-down operation?
Yes, the 74CB3Q16244DGGRG4 supports partial-power-down via its Ioff circuitry, limiting leakage to 1 µA when VCC = 0 V and VI/O = 0–5.5 V. This prevents damaging back-current flow between powered and unpowered system domains - a key requirement for hot-pluggable modules in optical networking and PBX equipment using the 74CB3Q16244DGGRG4.
Can the 74CB3Q16244DGGRG4 interface 3.3-V logic with 5-V peripherals?
Yes, the 74CB3Q16244DGGRG4 features 5-V tolerant I/Os that operate safely from 0 V to 5.5 V regardless of VCC (2.3–3.6 V). This allows direct connection between 3.3-V FPGAs or microcontrollers and legacy 5-V peripherals - such as analog line drivers in IP phones - without external level shifters, as verified in TI's SCDS168A datasheet Section 3.
What is the purpose of the four separate OE pins on the 74CB3Q16244DGGRG4?
The four OE pins (1OE–4OE) independently control four 4-bit switch groups, enabling granular signal routing. For example, 1OE can enable data transfer between FPGA and memory while 3OE isolates a sensor interface - all within the same 74CB3Q16244DGGRG4 device. This architecture supports flexible partitioning of 16-bit buses into 4-, 8-, or 16-bit configurations without redesigning PCB layout.
How does the charge-pump circuit in the 74CB3Q16244DGGRG4 improve performance?
The integrated charge pump elevates the gate voltage of internal FETs above VCC, ensuring strong turn-on even when input signals approach rail voltages. This delivers flat, low ON-state resistance (5 Ω typical) across the full 0–5-V I/O range and over temperature - unlike non-pumped switches whose ron degrades near VCC or GND. The result is consistent signal fidelity in the 74CB3Q16244DGGRG4 across all operating conditions.
74CB3Q16244DGGRG4 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:
- Discontinued at Digi-Key
- Type:
- Bus Switch
- Circuit:
- 1 x 4:1
- 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-TSSOP
74CB3Q16244DGGRG4 FAQ
1.How can I place an order for 74CB3Q16244DGGRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74CB3Q16244DGGRG4 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 74CB3Q16244DGGRG4 reliable?
The price and inventory of 74CB3Q16244DGGRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74CB3Q16244DGGRG4 is usually 5 days.
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74CB3Q16244DGGRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74CB3Q16244DGGRG4 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 74CB3Q16244DGGRG4?
For technical support, including 74CB3Q16244DGGRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74CB3Q16244DGGRG4 requirements.
6.How does Aetrix verify that 74CB3Q16244DGGRG4 is sourced from the original manufacturer or authorized distributors?
All 74CB3Q16244DGGRG4 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 74CB3Q16244DGGRG4 meets industry standards.
7.What is the process for return or replacement of 74CB3Q16244DGGRG4?
All 74CB3Q16244DGGRG4 units undergo pre-shipment inspection (PSI). If there is an issue with 74CB3Q16244DGGRG4, 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 74CB3Q16244DGGRG4 part is unused and in its original packaging.
Return procedure for 74CB3Q16244DGGRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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