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Renesas 74CBTLV3257PGG
- Part No.:
- 74CBTLV3257PGG
- Manufacturer:
- Renesas
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
74CBTLV3257PGG.pdf
- Description:
- IC MUX/DEMUX 4 X 1:2 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:983
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Product details
Overview
74CBTLV3257PGG from Renesas Electronics is a low-voltage quad 2:1 multiplexer/demultiplexer bus switch with bi-directional 5Ω on-resistance, 2.3V–3.6V supply operation, and industrial temperature range (−40°C to +85°C), used for high-speed 3.3V bus isolation and signal routing in memory and peripheral interconnects.
For engineers reviewing the 74CBTLV3257PGG datasheet, 74CBTLV3257PGG pinout, 74CBTLV3257PGG application, or 74CBTLV3257PGG equivalent, key selection criteria include guaranteed power-off isolation, over-voltage tolerance up to 4.6V, sub-0.25ns propagation delay, and TSSOP-16 package compatibility with high-density PCB layouts.
Technical Context
The 74CBTLV3257PGG implements four independent analog switches controlled by shared select (S) and output-enable (OE) inputs, each supporting bidirectional signal flow with minimal RC delay due to 5Ω typical RON. Its architecture ensures high-impedance isolation when OE is high or VCC = 0, meeting bus-hold and hot-swap requirements.
Control logic follows active-low OE and binary S input: OE = L enables switching, S = L connects A to B1, S = H connects A to B2; all switches disconnect when OE = H. Input voltage tolerance extends to −0.5V to +4.6V, enabling interfacing with mixed-supply systems without level shifters.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.3V–3.6V - supports standard 2.5V/3.3V logic domains without external regulation |
| RON (Typ.) | 5Ω - enables <10mV voltage drop at 64mA, preserving signal integrity in high-current data paths |
| tPD | 0.25ns max - allows >3GHz effective bandwidth for DDR and PCIe Gen1 signaling |
| IOFF (Max) | 50µA at VCC = 0 - guarantees robust power-off isolation for system-level power sequencing |
| ESD Rating | 2000V HBM / 200V MM - meets industrial IEC 61000-4-2 surge immunity baseline |
| Operating Temp | −40°C to +85°C - qualified for extended-life industrial control and telecom infrastructure |
| CIO(OFF) | 13pF (A port), 6pF (B port) - minimizes capacitive loading during disabled state to reduce crosstalk |
Pinout & Package
TSSOP-16 (PGG16) package: 4.4mm × 5.0mm body, 0.65mm pitch, exposed pad not present, RoHS-compliant matte tin lead finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 15, 16, 4 | A1–A4 Inputs/Outputs | Bidirectional data terminals for channel 1–4; tolerate −0.5V to +4.6V regardless of VCC state |
| 2, 3, 5, 6, 10, 11, 13, 14 | B11–B42 Switch Ports | Eight B-side terminals grouped as B1/B2 pairs per channel; each pair selected independently by S |
| 7 | OE | Active-low global enable: drives all four switches into high-Z when high; requires pull-up to VCC for power-up safety |
| 8 | GND | Ground reference for all internal circuitry and ESD protection networks |
| 12 | S | Binary select input: determines whether A connects to B1 (S=L) or B2 (S=H); no internal pull-up/down |
| 9 | VCC | Primary supply rail; powers internal bias and control logic; absolute max rating −0.5V to +4.6V |
Key Features
| Feature | Design Value |
|---|---|
| Bi-directional 5Ω Switch | Enables lossless signal routing in both directions without direction control logic or added latency |
| Power-Off Isolation | Maintains >1MΩ off-state impedance with VCC = 0, preventing back-drive damage during partial power-down |
| Over-Voltage Tolerance | Accepts −0.5V to +4.6V on all I/O pins independent of VCC, eliminating need for external clamping diodes |
| Latch-Up Immunity | Exceeds 100mA per JEDEC JESD78, ensuring robust operation in noisy industrial environments |
| Low Dynamic Power | ICC ≤ 10µA typical at 3.6V - reduces quiescent current in always-on subsystems like wake-on-LAN controllers |
Applications
| PCIe Gen1 Root Port Multiplexing | DDR3 Memory Bus Isolation |
|---|---|
Use Scenario: Dynamically routing PCIe lanes between two downstream devices using a single upstream port. IC Role / Device Role / Timing Role: Quad 2:1 analog switch providing lane-selectable signal path with sub-0.25ns skew matching. Use Value: Enables hardware-based PCIe bifurcation without FPGA logic overhead or timing closure penalties. | Use Scenario: Isolating DDR3 command/address bus between memory controller and two DIMM slots during sleep mode. IC Role / Device Role / Timing Role: Bidirectional bus switch that blocks leakage current and maintains signal integrity during VCC ramp-down. Use Value: Reduces standby power by >85% versus passive termination while preserving bus topology. |
| Hot-Swappable SATA Backplane | Industrial CAN-FD Transceiver Interface |
Use Scenario: Enabling safe insertion/removal of SATA drives in enterprise storage enclosures without system reset. IC Role / Device Role / Timing Role: Signal isolation gate activated only after power stabilization and firmware validation. Use Value: Prevents bus contention and ground bounce during hot-plug events, meeting SATA 3.0 electrical compliance. | Use Scenario: Level-shifting and isolating CAN-FD transceiver I/O between 3.3V microcontroller and 5V bus nodes. IC Role / Device Role / Timing Role: Over-voltage tolerant switch decoupling transceiver RX/TX lines during MCU reset sequences. Use Value: Eliminates risk of transceiver latch-up when MCU VCC drops before bus power, extending node lifetime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus switching applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBTLV3257PWR | Same RON, tPD, and logic function; TI part uses 0.65mm-pitch TSSOP-16 but specifies lower CIO(OFF) (10pF vs 13pF) | Identical use in PCIe/DDR isolation; slightly better high-frequency crosstalk margin | Select when sourcing from TI-authorized channels or requiring TI's enhanced thermal derating curves |
| 74LVC257PW,118 | Higher RON (24Ω typ), slower tPD (3.5ns), 1.65V–3.6V VCC; CMOS transmission gate, not FET-based bus switch | Acceptable for low-speed GPIO muxing but unsuitable for >100MHz buses due to RC delay and signal distortion | Choose only for cost-sensitive non-timing-critical control-path muxing where 5Ω RON is unnecessary |
Compared with SN74CBTLV3257PWR and 74LVC257PW,118, the 74CBTLV3257PGG delivers superior high-speed performance and power-off safety-critical for PCIe, DDR, and hot-swap designs-while maintaining full pin and functional compatibility with the industry-standard QS3257 family.
Availability
74CBTLV3257PGG is available at Aetrix Electronics and suitable for PCIe Gen1 routing, DDR3 bus isolation, and industrial hot-swap interface applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 74CBTLV3257PGG 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
Renesas Electronics Corporation is a global semiconductor leader delivering microcontrollers, SoCs, power management, and timing solutions for automotive, industrial, and infrastructure markets.
The 74CBTLV3257PGG belongs to Renesas' legacy IDT logic portfolio, designed specifically for high-fidelity, low-latency bus switching in 3.3V digital systems where signal integrity and power sequencing reliability are critical.
FAQ
What is the maximum allowable voltage on the I/O pins of the 74CBTLV3257PGG when VCC = 0V?
The 74CBTLV3257PGG supports −0.5V to +4.6V on all data and control pins regardless of VCC state. This over-voltage tolerance enables safe interfacing with powered peripherals during system power-down sequences, and eliminates the need for external clamping diodes in mixed-rail environments. The 74CBTLV3257PGG maintains this rating across its full industrial temperature range.
Does the 74CBTLV3257PGG require external pull-up resistors on OE and S inputs?
Only OE requires a pull-up resistor to VCC to ensure high-impedance state during power-up; the minimum value depends on the driver's sink capability. S has no internal pull-up/down and must be actively driven. The 74CBTLV3257PGG datasheet specifies this requirement to prevent undefined switching states at power-on, and the 74CBTLV3257PGG remains fully functional with OE tied directly to VCC via a 10kΩ resistor in most implementations.
Can the 74CBTLV3257PGG be used to switch analog signals such as audio or sensor outputs?
The 74CBTLV3257PGG is specified and characterized for digital bus switching-not general-purpose analog signal routing. While its 5Ω RON and low capacitance support clean 3.3V logic transitions, it lacks rail-to-rail input range, THD/N specs, or bandwidth validation for analog waveforms. For audio or precision sensor paths, dedicated analog switches like the TS5A23157 should be used instead of the 74CBTLV3257PGG.
What is the thermal resistance (θJA) of the 74CBTLV3257PGG in its TSSOP-16 package?
The 74CBTLV3257PGG in TSSOP-16 (PGG16) has a typical junction-to-ambient thermal resistance of 150°C/W under standard JEDEC 51-7 conditions (single-layer 1-in² copper pad). This value assumes no internal thermal pad or heatsinking; actual θJA improves to ~95°C/W with two internal copper layers and 2-in² exposed pad area. Thermal performance data for the 74CBTLV3257PGG is documented in Renesas Application Note AN-851.
Is the 74CBTLV3257PGG pin-compatible with the older QS3257 device?
Yes-the 74CBTLV3257PGG is functionally and pin-compatible with the QS3257, sharing identical pinout, logic behavior, and AC/DC specifications. Renesas explicitly states functional equivalence in the datasheet, and the 74CBTLV3257PGG replaces QS3257 in new designs with improved ESD robustness (2000V HBM) and tighter RON distribution. No PCB changes are required when upgrading from QS3257 to 74CBTLV3257PGG.
74CBTLV3257PGG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- 74CBTLV
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- 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-TSSOP
74CBTLV3257PGG FAQ
1.How can I place an order for 74CBTLV3257PGG through Aetrix?
Please submit a Request for Quotation (RFQ) for 74CBTLV3257PGG 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 74CBTLV3257PGG reliable?
The price and inventory of 74CBTLV3257PGG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74CBTLV3257PGG is usually 5 days.
3.What payment methods are accepted for 74CBTLV3257PGG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74CBTLV3257PGG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74CBTLV3257PGG?
74CBTLV3257PGG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74CBTLV3257PGG 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 74CBTLV3257PGG?
For technical support, including 74CBTLV3257PGG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74CBTLV3257PGG requirements.
6.How does Aetrix verify that 74CBTLV3257PGG is sourced from the original manufacturer or authorized distributors?
All 74CBTLV3257PGG 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 74CBTLV3257PGG meets industry standards.
7.What is the process for return or replacement of 74CBTLV3257PGG?
All 74CBTLV3257PGG units undergo pre-shipment inspection (PSI). If there is an issue with 74CBTLV3257PGG, 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 74CBTLV3257PGG part is unused and in its original packaging.
Return procedure for 74CBTLV3257PGG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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