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Texas Instruments SN74CBT3244CDGVR
- Part No.:
- SN74CBT3244CDGVR
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 20-TFSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74CBT3244CDGVR.pdf
- Description:
- IC BUS SWITCH 4 X 1:1 20TVSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,975
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Product details
Overview
SN74CBT3244CDGVR from Texas Instruments is a high-speed TTL-compatible FET bus switch organized as two independent 4-bit bidirectional switches, featuring 3 Ω typical ON-state resistance, near-zero propagation delay (0.15 ns at 5 V), and undershoot protection up to −2 V on both A and B ports. It operates from 4 V to 5.5 V and supports mixed-voltage signaling (0.8 V to 5 V) in USB interface and memory interleaving applications.
For engineers reviewing the SN74CBT3244CDGVR datasheet, SN74CBT3244CDGVR pinout, SN74CBT3244CDGVR application, or SN74CBT3244CDGVR equivalent, this page delivers verified electrical parameters, TVSOP-20 package details, Ioff partial-power-down behavior, and real-world use cases for bus isolation and low-distortion signal gating.
Technical Context
The SN74CBT3244CDGVR implements dual 4-bit FET-based analog/digital bus switches with independent OE control (1OE, 2OE). Each switch enables bidirectional conduction when its OE is low, with internal undershoot-protection circuitry actively clamping port voltages below −2 V to maintain OFF-state integrity during transient events.
It features Ioff support for partial-power-down operation, ensuring no backflow current when VCC = 0 V, and integrates clamp diodes on all data and control inputs. The device maintains high-impedance isolation between A and B ports when disabled, with Cio(OFF) = 5.5 pF typical to minimize capacitive loading and signal distortion.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4 V to 5.5 V - Enables compatibility with 5-V and mixed-voltage systems including 3.3-V/5-V interface translation. |
| ron (Typical) | 3 Ω - Ensures minimal voltage drop and power loss during signal pass-through, critical for low-noise analog and high-speed digital paths. |
| tpd (Max) | 0.24 ns at 4 V - Delivers near-zero propagation delay for timing-critical applications like memory interleaving and clock distribution gating. |
| Cio(OFF) | 5.5 pF typical - Reduces capacitive loading on driven buses, preserving signal edge rate and minimizing crosstalk in dense PCB layouts. |
| Undershoot Protection | −2 V on A/B ports - Prevents false turn-on during negative transients, eliminating need for external clamping diodes in industrial or hot-swap environments. |
| Ioff Current | 10 µA max at VCC = 0 - Guarantees safe isolation during power sequencing or partial system shutdown without damaging current paths. |
| VI/O Range | 0 to 5.5 V - Supports full 5-V signaling and level-shifting across 0.8-V, 1.2-V, 1.5-V, 1.8-V, 2.5-V, and 3.3-V logic families. |
Pinout & Package
SN74CBT3244CDGVR is housed in a 20-pin TVSOP (DGV) package, 4.3 mm × 3.6 mm × 1.05 mm, with 0.5-mm pitch, lead-free NIPDAU finish, and moisture sensitivity level (MSL) 1 (unlimited floor life).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE | Active-low output-enable control inputs | Enable/disable respective 4-bit switch sections independently; must be pulled to VCC via resistor during power-up for guaranteed high-Z state. |
| 1A1–1A4, 2A1–2A4 | Port A data terminals (Group 1 & 2) | Input/output pins for first and second 4-bit switch banks; bidirectional with no direction control required. |
| 1B1–1B4, 2B1–2B4 | Port B data terminals (Group 1 & 2) | Paired with corresponding A pins; conduct bidirectionally when OE is low; high-impedance when OE is high. |
| VCC | Positive supply | Power rail for internal FET biasing and clamp circuitry; must be stable within 4–5.5 V for specified performance. |
| GND | Ground reference | Common return path for all signals and supply current; requires low-inductance connection to minimize noise coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional switching | No direction pin required - simplifies PCB routing and eliminates control logic overhead in bus isolation designs. |
| Ioff partial-power-down | Blocks reverse current flow when VCC = 0 V - enables safe hot-plug operation and mixed-power-domain system design. |
| Undershoot protection | Active clamping to −2 V on all A/B ports - prevents unintended conduction during ESD or cable-disconnect transients. |
| Low input/output capacitance | Cio(OFF) = 5.5 pF - minimizes loading on high-speed buses, preserving signal integrity in USB 2.0 and DDR memory interfaces. |
| TTL/CMOS-compatible control | VIH = 2 V min, VIL = 0.8 V max - allows direct drive from legacy 5-V TTL or modern 3.3-V CMOS logic without level shifters. |
Applications
| USB Interface | Memory Interleaving |
|---|---|
|
Use Scenario: Isolating upstream/downstream data lines in USB 2.0 hubs or peripheral docking stations during enumeration or fault conditions. IC Role / Device Role / Timing Role: Bidirectional signal gate enabling/disabling USB D+/D− paths with sub-nanosecond delay and no direction control. Use Value: Eliminates need for discrete MOSFETs and level shifters while maintaining signal fidelity up to 480 Mbps due to 5.5-pF OFF-capacitance and 3-Ω ron. |
Use Scenario: Dynamically routing address/data between two memory banks in FPGA-based controllers to increase effective bandwidth. IC Role / Device Role / Timing Role: Low-latency, bidirectional bus switch synchronizing with memory controller clock edges to enable interleaved access patterns. Use Value: Near-zero tpd (0.15 ns) ensures timing closure in high-frequency memory subsystems; Ioff prevents data corruption during bank power cycling. |
| Bus Isolation | Low-Distortion Signal Gating |
|
Use Scenario: Segregating noisy microcontroller peripherals (e.g., motor drivers) from sensitive analog sensor buses in industrial PLCs. IC Role / Device Role / Timing Role: High-impedance barrier activated by firmware-controlled OE signals to decouple domains during fault detection or calibration. Use Value: −2 V undershoot protection prevents latch-up during inductive kickback; 10 µA Ioff ensures zero leakage into powered-down sections. |
Use Scenario: Enabling/disabling audio or video signal paths in AV receivers without audible pop or visual artifact. IC Role / Device Role / Timing Role: Analog-capable FET switch passing DC-coupled signals with flat frequency response and minimal harmonic distortion. Use Value: 3 Ω ron and 14 pF Cio(ON) preserve signal amplitude and rise/fall times; bidirectional operation avoids polarity-sensitive layout constraints. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBTD3384CDW | 8-bit single-section switch, higher ron (5 Ω typ), no undershoot protection, SOIC-24 package | Lacks dual-OE control and −2 V clamping; unsuitable for hot-swap or mixed-voltage isolation where transient immunity is critical | Select only if board space permits larger SOIC-24 and undershoot protection is not required. |
| SN74LVC1G3157DCKR | Single-pole double-throw (SPDT) analog switch, 3.3-V only, 6-pin SC70, ron = 10 Ω typ | Not pin-compatible; limited to 1-bit routing; lacks Ioff and undershoot protection; unsuitable for multi-bit bus applications | Use only for low-pin-count, single-signal gating where compact size outweighs multi-bit capability. |
Compared with SN74CBT3244CDGVR, SN74CBTD3384CDW offers simpler control but sacrifices transient robustness and flexibility, while SN74LVC1G3157DCKR trades density and functionality for footprint reduction-neither provides the dual 4-bit, undershoot-protected, Ioff-enabled architecture essential for reliable bus isolation in mixed-signal systems.
Availability
SN74CBT3244CDGVR is available at Aetrix Electronics and suitable for USB interface design, memory interleaving architectures, and industrial bus isolation requiring stable component supply and long-term production continuity.
Supply support for SN74CBT3244CDGVR 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 high-reliability components.
The SN74CBT3244C family was designed for high-speed, low-distortion signal routing in mixed-voltage digital systems-targeting applications demanding robust transient immunity, minimal propagation delay, and seamless integration into legacy and next-generation bus architectures.
FAQ
What is the maximum undershoot voltage the SN74CBT3244CDGVR can withstand on its A and B ports?
The SN74CBT3244CDGVR provides active undershoot protection up to −2 V on both A and B ports, as confirmed in the absolute maximum ratings and undershoot characteristics section of the SCDS130A datasheet. This clamping function remains active regardless of OE state and prevents unintended switch turn-on during negative transients, making SN74CBT3244CDGVR suitable for hot-swap and industrial environments where cable disconnect or ESD events may occur.
Does the SN74CBT3244CDGVR support partial-power-down operation, and how is it implemented?
Yes, the SN74CBT3244CDGVR supports partial-power-down operation via its Ioff feature. When VCC = 0 V, the device limits Ioff to 10 µA maximum while maintaining high-impedance isolation between A and B ports. This prevents damaging backflow current from live buses into unpowered sections-a key requirement for systems with staggered power sequencing. The Ioff specification is validated per JEDEC JESD78 Class II latch-up testing.
What is the typical ON-state resistance (ron) of the SN74CBT3244CDGVR, and how does it affect signal integrity?
The SN74CBT3244CDGVR has a typical ON-state resistance of 3 Ω at VCC = 4.5 V and IO = 30 mA, as measured per the datasheet's electrical characteristics table. This low ron minimizes voltage drop and power dissipation across the switch, preserving signal amplitude and reducing jitter in high-speed digital paths. In analog applications, it ensures flat gain response and low THD, directly supporting low-distortion signal gating in audio and video routing.
Can the SN74CBT3244CDGVR be used for level translation between different logic families?
Yes, the SN74CBT3244CDGVR supports 0 to 5.5-V signaling on its data I/Os and accepts TTL- or CMOS-level control inputs (VIH ≥ 2 V, VIL ≤ 0.8 V), enabling interoperability among 0.8-V, 1.2-V, 1.5-V, 1.8-V, 2.5-V, 3.3-V, and 5-V logic families. Its bidirectional nature and lack of direction control simplify level-shifting implementations-no external biasing or direction logic is needed, unlike traditional translators requiring dedicated VREF or DIR pins.
What package type is used for the SN74CBT3244CDGVR, and what are its key mechanical attributes?
The SN74CBT3244CDGVR uses the TVSOP-20 (DGV) package: 4.3 mm × 3.6 mm × 1.05 mm body size, 0.5-mm lead pitch, 20-pin configuration, lead-free NIPDAU finish, and MSL Level-1 (unlimited floor life). Its compact footprint and low profile make it ideal for space-constrained applications such as portable USB devices and dense FPGA carrier boards, while the exposed pad variant (not used here) is reserved for thermal-enhanced variants like RGY.
SN74CBT3244CDGVR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CBT
- Package/Case:
- 20-TFSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Bus Switch
- Circuit:
- 4 x 1:1
- Independent Circuits:
- 2
- Current - Output High, Low:
- -
- Voltage Supply Source:
- Single Supply
- Voltage - Supply:
- 4V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TVSOP
SN74CBT3244CDGVR FAQ
1.How can I place an order for SN74CBT3244CDGVR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CBT3244CDGVR 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 SN74CBT3244CDGVR reliable?
The price and inventory of SN74CBT3244CDGVR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBT3244CDGVR is usually 5 days.
3.What payment methods are accepted for SN74CBT3244CDGVR?
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SN74CBT3244CDGVR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74CBT3244CDGVR 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 SN74CBT3244CDGVR?
For technical support, including SN74CBT3244CDGVR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBT3244CDGVR requirements.
6.How does Aetrix verify that SN74CBT3244CDGVR is sourced from the original manufacturer or authorized distributors?
All SN74CBT3244CDGVR 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 SN74CBT3244CDGVR meets industry standards.
7.What is the process for return or replacement of SN74CBT3244CDGVR?
All SN74CBT3244CDGVR units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBT3244CDGVR, 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 SN74CBT3244CDGVR part is unused and in its original packaging.
Return procedure for SN74CBT3244CDGVR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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