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Texas Instruments SN74CBTLV3257DGVR
- Part No.:
- SN74CBTLV3257DGVR
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-TFSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74CBTLV3257DGVR.pdf
- Description:
- IC MUX/DEMUX 4 X 1:2 16TVSOP
- Quantity:
- Payment:
- Shipping:
Inventory:25,808
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Product details
Overview
SN74CBTLV3257 from Texas Instruments is a low-voltage 4-bit 1-of-2 FET multiplexer/demultiplexer with 5Ω on-state resistance, rail-to-rail switching, and Ioff partial-power-down support. It operates from 2.3V to 3.6V, delivers sub-6ns propagation delay (tpd), and enables bidirectional signal routing in high-speed digital buses for datacenter interconnects and wired networking equipment.
For engineers reviewing the SN74CBTLV3257 datasheet, SN74CBTLV3257 pinout, SN74CBTLV3257 application, or SN74CBTLV3257 equivalent, key selection criteria include its 5Ω switch RON at 3.3V/64mA, ±128mA channel current rating, -40°C to 85°C operating range, TVSOP-16 package footprint (3.60mm × 4.40mm), and active-low OE control for bus isolation during power sequencing.
Technical Context
The SN74CBTLV3257 implements four independent bidirectional analog switches, each selectable between two I/O paths (B1/B2) via a shared S input and globally enabled/disabled by OE. Its FET-based architecture provides symmetrical, low-capacitance signal paths with no internal logic buffering-enabling true rail-to-rail analog/digital signal pass-through without level shifting.
Functional operation follows a 2:1 mux/demux truth table: when OE = L, S = L connects A ports to B1 ports; S = H connects A ports to B2 ports; OE = H forces all channels into high-impedance state. The Ioff specification guarantees <15µA leakage when VCC = 0V and any I/O is biased 0–3.6V, enabling hot-swap and partial-power-down system architectures.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| On-state resistance (RON) | 5Ω typical at VCC = 3.3V, 64mA - ensures minimal voltage drop and signal attenuation in high-current digital bus switching. |
| Propagation delay (tpd) | 0.15–0.25ns at VCC = 2.5V - supports >200MHz signal routing with negligible timing skew across 4-bit buses. |
| Supply voltage range | 2.3V to 3.6V - compatible with 2.5V and 3.3V logic domains while maintaining rail-to-rail I/O swing. |
| Ioff leakage current | 15µA max at VCC = 0V - prevents backdrive damage and enables safe operation during partial power-down sequences. |
| ESD rating (HBM) | 2000V - meets industrial-grade robustness requirements for board-level handling and system integration. |
| Channel current rating | ±128mA per channel - supports driving moderate capacitive loads and fanout without external buffering. |
| Operating temperature | -40°C to +85°C - qualified for enterprise computing, building automation, and wired networking environments. |
Pinout & Package
SN74CBTLV3257DGVR uses a 16-pin TVSOP (Thin Very Small Outline Package) with 0.4mm pitch, 3.60mm × 4.40mm body size, and exposed thermal pad (non-electrical). Pin 1 is S (Select), pin 8 is GND, pin 15 is OE (active-low Output Enable), and pin 16 is VCC. All I/O pins (1A–4A, 1B1–4B2) are bidirectional and overvoltage tolerant up to 4.6V.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (S) | Select control input | Determines whether A ports connect to B1 (S = L) or B2 (S = H); requires clean CMOS-level transition for glitch-free switching. |
| 2–3, 5–6, 9–10, 12–14 (1B1–4B2) | Bidirectional I/O port pairs | Each pair (e.g., 1B1/1B2) serves as one of two selectable paths for corresponding A port; no internal directionality. |
| 4, 7, 9, 12 (1A–4A) | Common bidirectional I/O terminals | Connect to 4-bit bus; routed to either B1 or B2 side based on S and OE states; tolerate 4.6V regardless of VCC. |
| 8 (GND) | Ground reference | Primary return path for switch current and supply decoupling; must be low-impedance for signal integrity. |
| 15 (OE) | Active-low output enable | When high, forces all channels into high-Z; tied to VCC via pullup resistor to ensure defined state during power-up/down. |
| 16 (VCC) | Power supply | Single 2.3–3.6V supply powers all switches and control logic; requires 0.1µF ceramic decoupling capacitor placed adjacent to pin. |
Key Features
| Feature | Design Value |
|---|---|
| 5Ω low on-resistance | Minimizes insertion loss and maintains signal edge fidelity in high-speed parallel buses up to 200MHz. |
| Rail-to-rail I/O switching | Supports full 0V–VCC voltage swing on all ports, enabling compatibility with mixed-voltage systems and analog signal routing. |
| Ioff partial-power-down | Blocks damaging back-current flow when VCC = 0V and I/O pins remain biased, critical for hot-plug and power-gated subsystems. |
| Latch-up immunity | Exceeds 100mA per JESD 78 Class II - ensures robust operation in noisy industrial and enterprise environments. |
| Low input capacitance | 3pF typical - reduces loading on driving sources and preserves bandwidth in high-frequency applications. |
Applications
| Enterprise Server Backplane Switching | Data Center Memory Interconnect |
|---|---|
Use Scenario: Routing DDR memory command/address signals between dual-channel controllers and DIMM slots in modular server blades. IC Role / Device Role / Timing Role: Bidirectional 4-bit mux isolating conflicting control lines during channel failover or maintenance mode. Use Value: 5Ω RON and sub-0.25ns tpd prevent timing skew across CA bus, while Ioff protects powered-down memory modules from backfeed. |
Use Scenario: Selecting between two identical PCIe root complexes for redundant host interface in storage controller ASICs. IC Role / Device Role / Timing Role: Low-latency 4-bit data path selector enabling seamless switchover without retraining or packet loss. Use Value: Rail-to-rail operation preserves PCIe 3.0 signal integrity; 200MHz capability exceeds Gen3 eye diagram requirements. |
| Industrial Ethernet PHY Multiplexing | Building Automation Controller Bus Expansion |
Use Scenario: Sharing a single MDIO management interface between multiple Gigabit Ethernet PHYs on a factory-floor switch PCB. IC Role / Device Role / Timing Role: 4-bit bidirectional mux enabling software-selectable PHY access without hardware redesign. Use Value: ±128mA drive strength handles MDIO pull-up requirements; -40°C to 85°C rating matches industrial ambient specs. |
Use Scenario: Expanding RS-485 Modbus RTU bus segments across HVAC zone controllers using shared master port. IC Role / Device Role / Timing Role: Isolating and selecting between two differential bus branches under microcontroller control. Use Value: Overvoltage tolerance (4.6V) accommodates RS-485 common-mode transients; OE pin enables clean bus arbitration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar FET multiplexer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBTLV3257PWR | TSSOP-16 package (5.00mm × 4.40mm); identical electrical specs and pinout; MSL Level-1 vs DGV's Level-1-UNLIM. | Same functional behavior but larger PCB footprint; preferred where thermal relief or hand-soldering is required. | Choose PWR for legacy TSSOP assembly lines or when TVSOP reflow profile constraints exist. |
| SN74CBTLV3257DBQR | SSOP-16 package (4.90mm × 3.90mm); identical switching specs; slightly higher RθJA (116.6°C/W vs 123.1°C/W). | Compatible in space-constrained designs needing marginally better thermal performance than TVSOP. | Choose DBQR when board layout allows tighter trace routing around narrower body width. |
Compared with SN74CBTLV3257DGVR, the PWR offers identical functionality in a mechanically distinct TSSOP package suited for different assembly processes, while DBQR provides comparable performance in a narrower SSOP variant-neither is pin-compatible without PCB revision due to differing package outlines and thermal pad presence.
Availability
SN74CBTLV3257DGVR is available at Aetrix Electronics and suitable for enterprise server backplanes, industrial Ethernet PHY interfaces, and building automation controller bus expansion requiring stable component supply and long-term lifecycle assurance.
Supply support for SN74CBTLV3257DGVR 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 solutions, with decades of expertise in high-speed interface ICs and signal integrity engineering.
The SN74CBTLV3257 belongs to TI's CBTLV low-voltage FET switch family, designed specifically for high-bandwidth, low-distortion signal routing in enterprise computing, wired networking, and industrial control systems.
FAQ
What is the maximum operating frequency supported by the SN74CBTLV3257?
The SN74CBTLV3257 is characterized for operation up to 200MHz, verified through switching measurements and typical application curves. This limit arises from combined effects of 5Ω on-resistance and ~10pF off-capacitance, yielding a bandwidth sufficient for DDR2/3 control buses and PCIe Gen3 management interfaces. Signal integrity at this frequency requires controlled-impedance PCB routing and proper termination.
How does the Ioff feature protect the SN74CBTLV3257 during partial power-down?
The Ioff feature limits leakage current to ≤15µA when VCC = 0V and any I/O pin is biased between 0V and 3.6V, preventing damaging back-current flow from live system rails into unpowered sections. In the SN74CBTLV3257, this is implemented via transistor cutoff mechanisms that isolate internal FET channels, ensuring safe hot-swap and power-gating scenarios without external protection circuitry.
Is the SN74CBTLV3257 compatible with 5V-tolerant systems?
Yes-the SN74CBTLV3257 supports overvoltage tolerance up to 4.6V on all I/O pins regardless of VCC setting (2.3V–3.6V), allowing safe interfacing with 5V logic families when used as a level-translating mux. However, it does not generate 5V outputs; its rail-to-rail switching only spans 0V to the applied VCC, so external level shifters are needed for true 5V signaling.
What is the recommended decoupling strategy for the SN74CBTLV3257DGVR?
A 0.1µF X7R ceramic capacitor must be placed within 2mm of the SN74CBTLV3257DGVR's VCC (pin 16) and GND (pin 8) pins to suppress high-frequency supply noise. For systems with multiple SN74CBTLV3257DGVR devices or sensitive adjacent circuitry, add a 1µF bulk capacitor nearby. Avoid shared vias between decoupling caps and signal traces to maintain low-inductance return paths.
Can the SN74CBTLV3257 be used for analog signal switching?
Yes-the SN74CBTLV3257's FET-based architecture provides bidirectional, rail-to-rail analog signal pass-through with flat on-resistance (5Ω typical) and low charge injection (<10pC), making it suitable for low-frequency analog multiplexing (e.g., sensor front-ends, audio routing below 10MHz). Its 10.5pF off-capacitance and 3pF input capacitance minimize crosstalk and loading in such applications.
SN74CBTLV3257DGVR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CBTLV
- Package/Case:
- 16-TFSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Multiplexer/Demultiplexer
- Circuit:
- 4 x 1:2
- Independent Circuits:
- 4
- Current - Output High, Low:
- -
- Voltage Supply Source:
- Single Supply
- Voltage - Supply:
- 2.3V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TVSOP
SN74CBTLV3257DGVR FAQ
1.How can I place an order for SN74CBTLV3257DGVR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CBTLV3257DGVR 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 SN74CBTLV3257DGVR reliable?
The price and inventory of SN74CBTLV3257DGVR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBTLV3257DGVR is usually 5 days.
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SN74CBTLV3257DGVR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74CBTLV3257DGVR 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 SN74CBTLV3257DGVR?
For technical support, including SN74CBTLV3257DGVR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBTLV3257DGVR requirements.
6.How does Aetrix verify that SN74CBTLV3257DGVR is sourced from the original manufacturer or authorized distributors?
All SN74CBTLV3257DGVR 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 SN74CBTLV3257DGVR meets industry standards.
7.What is the process for return or replacement of SN74CBTLV3257DGVR?
All SN74CBTLV3257DGVR units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBTLV3257DGVR, 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 SN74CBTLV3257DGVR part is unused and in its original packaging.
Return procedure for SN74CBTLV3257DGVR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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