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Texas Instruments 74CB3Q3244DBQRE4
- Part No.:
- 74CB3Q3244DBQRE4
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 20-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
74CB3Q3244DBQRE4.pdf
- Description:
- IC BUS SWITCH 4 X 1:1 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,530
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Product details
Overview
74CB3Q3244DBQRE4 from Texas Instruments is a high-bandwidth 8-bit FET bus switch organized as two independent 4-bit bidirectional switches, featuring 4 Ω typical ON-state resistance (ron), rail-to-rail 0–5 V switching at 3.3 V VCC, and 3.5 pF typical OFF-state I/O capacitance. It supports partial-power-down via Ioff and enables low-distortion signal gating in memory interleaving and bus isolation applications.
For engineers reviewing the 74CB3Q3244DBQRE4 datasheet, 74CB3Q3244DBQRE4 pinout, 74CB3Q3244DBQRE4 application, or 74CB3Q3244DBQRE4 equivalent, key selection criteria include its 20-pin SSOP-DBQ package, 2.3–3.6 V VCC operation, 5-V-tolerant I/Os with device powered up or down, and sub-0.2 ns propagation delay for high-speed digital interface design.
Technical Context
The 74CB3Q3244DBQRE4 implements a charge-pump-enhanced FET switch architecture to maintain flat, low ron across input voltage range (0–5 V), enabling rail-to-rail analog/digital signal pass-through without level-shifting. Its dual 4-bit structure allows flexible configuration as either two independent switches or one 8-bit switch via separate 1OE/2OE controls.
Each switch channel provides near-zero propagation delay (<0.2 ns), bidirectional data flow, and Ioff protection that blocks current backflow during partial power-down. 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 Range | 2.3 V to 3.6 V - Enables direct integration into 2.5 V and 3.3 V logic systems without external regulators. |
| ron (Typical) | 4 Ω at VCC = 3.3 V - Minimizes voltage drop and signal attenuation for high-fidelity data path integrity. |
| Cio(OFF) (Typical) | 3.5 pF - Reduces capacitive loading on buses, preserving signal edge rate and minimizing crosstalk. |
| tpd (Max) | 0.2 ns at VCC = 3.3 V - Supports >500 MHz bandwidth applications with negligible timing skew. |
| Ioff (Max) | 1 µA at VCC = 0 V - Ensures robust isolation and prevents backfeed damage during system power sequencing. |
| fOE (Max) | 20 MHz - Allows high-frequency enable/disable control for dynamic bus partitioning in real-time systems. |
| VI/O Range | 0 V to 5.5 V - Permits 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. |
Pinout & Package
74CB3Q3244DBQRE4 is housed in a 20-pin SSOP (Shrink Small-Outline Package), DBQ variant, with 0.65 mm pitch, 7.2 mm × 5.3 mm body size, and exposed thermal pad not present (standard plastic SSOP). Pin 1 is located at top-left corner with index marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE | Independent output-enable inputs | Active-low controls for each 4-bit switch section; enable/disable bidirectional A↔B connection independently. |
| 1A1–1A4, 2A1–2A4 | Switch A-side data terminals | Input/output ports for first and second 4-bit switch banks; support full rail-to-rail signaling (0–5 V). |
| 1B1–1B4, 2B1–2B4 | Switch B-side data terminals | Complementary I/O ports paired with respective A-side pins; identical electrical characteristics and bidirectional capability. |
| VCC | Power supply | Supplies internal charge pump and logic; must be within 2.3–3.6 V; powers I/O clamp diodes and control circuitry. |
| GND | Ground reference | Common return path for all signals and internal circuitry; required for proper charge pump operation and noise rejection. |
Key Features
| Feature | Design Value |
|---|---|
| Charge-pump gate drive | Elevates FET gate voltage above VCC to sustain low, flat ron across full VI/O range (0–5 V), eliminating signal-dependent distortion. |
| 5-V-tolerant I/Os | Supports 0–5 V signaling regardless of VCC state (powered up/down), enabling safe hot-plug and mixed-voltage interconnect. |
| Ioff partial-power-down | Blocks current flow between A/B ports when VCC = 0 V, preventing backdrive damage during board-level power sequencing. |
| Undershoot clamp diodes | Integrated diodes on all data and control inputs limit negative transients to −1.8 V, enhancing robustness in noisy environments. |
| Low ICC (0.7 mA typ) | Reduces static power consumption in always-on subsystems such as standby interfaces or battery-backed monitoring paths. |
Applications
| Memory Interleaving | PCI Express Lane Multiplexing |
|---|---|
|
Use Scenario: Dynamically routing address/data lines between two DDR memory banks sharing a common controller. IC Role / Device Role / Timing Role: Bidirectional 8-bit bus switch enabling time-multiplexed access while maintaining signal integrity across 500 MHz data bursts. Use Value: Eliminates need for level shifters or complex glue logic; preserves edge rate with <0.2 ns tpd and 3.5 pF Cio(OFF). |
Use Scenario: Sharing a single PCIe x4 slot between two host processors in failover or load-balancing configurations. IC Role / Device Role / Timing Role: High-bandwidth, low-latency signal gate isolating lanes during reconfiguration without violating PCIe timing budgets. Use Value: 4 Ω ron and rail-to-rail 0–3.3 V switching ensure minimal insertion loss and jitter accumulation across Gen3/Gen4 links. |
| Test Equipment Signal Routing | Industrial Fieldbus Isolation |
|
Use Scenario: Reconfigurable signal path in automated test equipment connecting DUT I/O to multiple instrument channels. IC Role / Device Role / Timing Role: Low-capacitance, bidirectional switch enabling fast, repeatable channel selection with sub-nanosecond timing resolution. Use Value: 20 MHz fOE and 3.5 pF Cio(OFF) allow rapid switching without degrading rise/fall times of high-speed digital waveforms. |
Use Scenario: Electrically isolating Modbus RTU or CAN FD transceiver lines from microcontroller GPIO during firmware updates. IC Role / Device Role / Timing Role: Fail-safe bus switch disconnecting MCU I/O from field wiring when VCC is removed or reset asserted. Use Value: Ioff <1 µA and 5-V-tolerant I/Os prevent backfeed and support legacy 5 V fieldbus voltages even during MCU power-down. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBT3244DBQR | Higher ron (7 Ω typ), no charge pump, 4.5 V max VI/O, no Ioff support | Limited to 3.3 V-only systems; unsuitable for partial-power-down or 5 V tolerant use cases | Select only if cost sensitivity outweighs performance and robustness requirements in fixed 3.3 V designs. |
| TS3L301DBQR | Lower bandwidth (300 MHz), higher Cio(OFF) (6.5 pF), 2.5–3.6 V VCC only, no 5 V tolerance | Not suitable for mixed-voltage or >400 MHz applications; lacks undershoot clamping | Consider only for lower-speed, single-supply industrial interfaces where TI's CB3Q family is unavailable. |
Compared with SN74CBT3244DBQR and TS3L301DBQR, the 74CB3Q3244DBQRE4 delivers superior bandwidth, lower ron, true 5-V tolerance, and Ioff-enabled system-level power sequencing - making it the only option supporting simultaneous high-speed, mixed-voltage, and partial-power-down requirements.
Availability
74CB3Q3244DBQRE4 is available at Aetrix Electronics and suitable for memory interleaving, PCIe lane multiplexing, and industrial fieldbus isolation requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for 74CB3Q3244DBQRE4 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 high-performance logic solutions with over 50 years of innovation in signal integrity and interface technologies.
The 74CB3Q3244DBQRE4 belongs to TI's CB3Q family of high-bandwidth FET bus switches, engineered specifically for broadband communications, networking infrastructure, and data-intensive computing systems demanding minimal propagation delay and rail-to-rail signal fidelity.
FAQ
What is the maximum operating frequency supported by the 74CB3Q3244DBQRE4?
The 74CB3Q3244DBQRE4 supports up to 500 MHz signal bandwidth due to its low 4 Ω typical ON-state resistance and 3.5 pF OFF-state I/O capacitance. Its maximum switching frequency for the OE control input is 20 MHz, and propagation delay is specified at ≤0.2 ns under 3.3 V conditions - enabling reliable operation in high-speed DDR, PCIe Gen3, and test instrumentation applications.
Does the 74CB3Q3244DBQRE4 support 5 V logic levels while powered from 3.3 V?
Yes, the 74CB3Q3244DBQRE4 supports 0–5 V signaling on all data I/O ports (A and B sides) when VCC is supplied at 3.3 V. This 5-V-tolerant operation is guaranteed across the full recommended temperature range (−40°C to 85°C) and requires no external level-shifting components, simplifying mixed-voltage system design.
How does the Ioff feature protect the 74CB3Q3244DBQRE4 during partial power-down?
The Ioff circuitry in the 74CB3Q3244DBQRE4 limits current flow to ≤1 µA when VCC = 0 V and VI/O = 0–5.5 V, preventing damaging back-current from live buses into a powered-down device. This ensures safe hot-swap capability and robust power sequencing in multi-rail systems without requiring external isolation components.
What is the pin-compatible replacement for the 74CB3Q3244DBQRE4 in the same SSOP-DBQ package?
No pin-compatible drop-in replacement exists for the 74CB3Q3244DBQRE4 with identical charge-pump architecture, 5-V tolerance, and Ioff. Alternative packages like SN74CB3Q3244RGYR (VQFN) or SN74CB3Q3244PWR (TSSOP) share identical functionality but require PCB layout changes. Always verify timing, thermal, and routing constraints before substitution.
Can the 74CB3Q3244DBQRE4 be used for analog signal switching?
Yes, the 74CB3Q3244DBQRE4 is explicitly qualified for both digital and analog applications including differential signal interface and low-distortion signal gating. Its flat ron profile (±0.5 Ω variation over 0–5 V), low Cio(OFF), and rail-to-rail operation make it suitable for passing analog signals up to 250 MHz with minimal THD and insertion loss.
74CB3Q3244DBQRE4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CB
- Package/Case:
- 20-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Type:
- Bus Switch
- Circuit:
- 4 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:
- 20-SSOP
74CB3Q3244DBQRE4 FAQ
1.How can I place an order for 74CB3Q3244DBQRE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74CB3Q3244DBQRE4 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 74CB3Q3244DBQRE4 reliable?
The price and inventory of 74CB3Q3244DBQRE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74CB3Q3244DBQRE4 is usually 5 days.
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74CB3Q3244DBQRE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74CB3Q3244DBQRE4 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 74CB3Q3244DBQRE4?
For technical support, including 74CB3Q3244DBQRE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74CB3Q3244DBQRE4 requirements.
6.How does Aetrix verify that 74CB3Q3244DBQRE4 is sourced from the original manufacturer or authorized distributors?
All 74CB3Q3244DBQRE4 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 74CB3Q3244DBQRE4 meets industry standards.
7.What is the process for return or replacement of 74CB3Q3244DBQRE4?
All 74CB3Q3244DBQRE4 units undergo pre-shipment inspection (PSI). If there is an issue with 74CB3Q3244DBQRE4, 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 74CB3Q3244DBQRE4 part is unused and in its original packaging.
Return procedure for 74CB3Q3244DBQRE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
74CB3Q3244DBQRE4 Tags
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