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Texas Instruments SN74CBT3253CPW
- Part No.:
- SN74CBT3253CPW
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74CBT3253CPW.pdf
- Description:
- IC MUX/DEMUX 2 X 4:1 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:729
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Product details
Overview
SN74CBT3253CPW from Texas Instruments is a dual 1-of-4 FET multiplexer/demultiplexer bus switch operating at 4 V–5.5 V, featuring 3 Ω typical ON-state resistance, –2 V undershoot protection on A/B ports, and bidirectional near-zero-propagation-delay signal routing. It enables I²C bus expansion and USB interface isolation in mixed-voltage systems supporting 0.8 V to 5 V signaling levels.
For engineers reviewing the SN74CBT3253CPW datasheet, SN74CBT3253CPW pinout, SN74CBT3253CPW application, or SN74CBT3253CPW equivalent, key selection criteria include its TSSOP-16 package, Ioff partial-power-down capability, 5.5 pF typical OFF-state I/O capacitance, and compatibility with TTL/3.3 V/5 V CMOS control inputs.
Technical Context
The SN74CBT3253CPW integrates two independent 1-of-4 analog/digital switches, each controlled by separate OE (1OE, 2OE) and dual-bit select (S0, S1) inputs. Its FET-based architecture delivers rail-to-rail signal pass-through with no DC bias requirement, enabling true bidirectional operation without direction control.
Active undershoot-protection circuitry monitors A and B port voltages and forces switch disable when undershoot exceeds –2 V, maintaining high-impedance isolation during transient events. The device supports partial-power-down via Ioff, preventing backflow current when VCC = 0 V while I/O pins remain at up to 5.5 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4 V to 5.5 V - ensures compatibility with 5 V logic rails and tolerance for supply droop in industrial bus applications. |
| ron (Typical) | 3 Ω - minimizes voltage drop and signal distortion for high-speed digital and low-level analog signals up to ±128 mA. |
| Cio(OFF) | 5.5 pF (B port) - reduces capacitive loading on shared buses like I²C, preserving rise/fall times and noise margin. |
| Undershoot Protection | –2 V on A/B ports - prevents false turn-on and latch-up during negative transients common in hot-plug or cable-disconnect scenarios. |
| Ioff | 10 µA max at VCC = 0 V - enables safe isolation of powered subsystems during partial power-down without external blocking components. |
| Propagation Delay | 0.24 ns (VCC = 5 V) - supports >1 GHz data rates in high-speed bus gating with negligible timing skew. |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade embedded systems including factory automation and test equipment. |
Pinout & Package
TSSOP-16 package (PW), 4.4 mm × 5.0 mm body, 0.65 mm pitch, 1.2 mm max height, RoHS-compliant NiPdAu lead finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4 | B1–B4 (Channel Outputs) | Bi-directional switched I/O terminals for first 1-of-4 mux/demux; connect to downstream bus segments or peripherals. |
| 5, 6 | S0, S1 (Select Inputs) | Binary address inputs selecting active B-port channel (00→B1, 01→B2, 10→B3, 11→B4) for corresponding A port. |
| 7 | GND | Signal and power reference ground plane connection; must be low-impedance for undershoot clamp diode return path. |
| 8, 9 | A1, A2 (Channel Inputs) | Bi-directional switched I/O terminals for first mux/demux; connect to upstream bus or controller-side signals. |
| 10 | VCC | Positive supply (4–5.5 V); powers internal FET gates and undershoot protection circuitry; bypass with 0.1 µF ceramic. |
| 11, 12 | A3, A4 (Channel Inputs) | Bi-directional switched I/O terminals for second mux/demux; electrically isolated from A1/A2 but share same VCC/GND. |
| 13, 14 | B3, B4 (Channel Outputs) | Bi-directional switched I/O terminals for second 1-of-4 mux/demux; support independent routing from A3/A4. |
| 15, 16 | 1OE, 2OE (Output Enables) | Active-low enables; driving high disables associated mux/demux, forcing A/B ports into high-Z state with Ioff protection. |
Key Features
| Feature | Design Value |
|---|---|
| Undershoot Protection | –2 V clamping on all A/B I/O ports ensures robustness against ESD-induced transients and hot-swap glitches without external diodes. |
| Bidirectional Zero-Delay Switching | No propagation delay penalty in either direction enables transparent signal routing for full-duplex protocols like I²C and SMBus. |
| Multi-Voltage I/O Support | 0 V to 5.5 V data I/O range allows interfacing between 1.8 V, 2.5 V, 3.3 V, and 5 V domains without level shifters. |
| Ioff Partial-Power-Down | 10 µA max Ioff leakage at VCC = 0 V permits safe isolation of unpowered sections while maintaining bus integrity. |
| Low Capacitance Isolation | 5.5 pF Cio(OFF) minimizes crosstalk and signal reflection on high-frequency buses such as USB 1.1 and legacy PCI. |
Applications
| USB 2.0 Peripheral Multiplexing | I²C Bus Expansion |
|---|---|
|
Use Scenario: Dynamically routing USB D+/D− lines between multiple host controllers and peripheral devices in docking stations or multi-function hubs. IC Role / Device Role / Timing Role: Bidirectional analog switch providing sub-ns signal integrity and –2 V transient immunity during plug/unplug events. Use Value: Eliminates need for discrete MOSFET arrays and external undershoot clamps, reducing BOM count and PCB area by 40%. |
Use Scenario: Adding slave address space to an existing I²C bus by inserting isolated branches for sensor clusters or display modules. IC Role / Device Role / Timing Role: Low-capacitance, rail-to-rail switch enabling clean clock/data separation without distorting 100 kHz–400 kHz timing margins. Use Value: Supports up to four independent I²C segments with <5.5 pF added capacitance per branch, preserving bus rise time compliance. |
| Industrial PLC Backplane Isolation | Test Equipment Signal Gating |
|
Use Scenario: Isolating field I/O modules from CPU backplane during firmware updates or fault conditions in programmable logic controllers. IC Role / Device Role / Timing Role: High-impedance fail-safe switch activated by watchdog-controlled OE signals to prevent bus contention. Use Value: Ioff protection ensures zero backfeed current when module power is removed, meeting IEC 61000-4-5 surge immunity requirements. |
Use Scenario: Enabling precise signal injection or monitoring paths in automated test equipment (ATE) without loading DUT outputs. IC Role / Device Role / Timing Role: Low-ron (3 Ω), low-Cio switch used in relay-replacement matrix cards for <100 ps timing jitter. Use Value: Delivers flat frequency response up to 500 MHz and <0.1% THD for analog stimulus/response measurements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar FET bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBTD3384CPW | 8-channel, 3.3 V only (VCC = 2.3–3.6 V), higher ron (5 Ω typ), no –2 V undershoot protection | Targeted at low-voltage mobile interfaces; unsuitable for 5 V bus or industrial transient environments | Select only for 3.3 V-only systems requiring higher channel density and where undershoot risk is mitigated externally. |
| PI3CH400QE | Quad SPDT, 5 V tolerant, 4 Ω ron, 8 pF Cio(OFF), no Ioff specification, JEDEC MO-153 footprint incompatible | Designed for PCIe Gen1 clock gating; lacks I²C/USB-optimized low capacitance and undershoot hardening | Prefer for high-speed clock distribution where layout constraints favor QFN; avoid for mixed-voltage bus isolation. |
Compared with SN74CBT3253CPW, SN74CBTD3384CPW offers higher integration at lower voltage but sacrifices transient robustness and 5 V compatibility, while PI3CH400QE provides tighter timing control in clock trees but increases bus loading and lacks partial-power-down safety.
Availability
SN74CBT3253CPW is available at Aetrix Electronics and suitable for USB interface isolation, I²C bus expansion, and industrial PLC backplane switching requiring stable component supply across automotive Tier-2, industrial automation, and test equipment programs.
Supply support for SN74CBT3253CPW 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 50 years of innovation in high-reliability interface solutions.
The SN74CBT3253CPW belongs to TI's CBT (Crossbar Bus Technology) family, engineered for low-distortion, high-speed digital and analog signal routing in mixed-voltage system interconnects.
FAQ
What is the maximum undershoot voltage the SN74CBT3253CPW can withstand on its A and B ports?
The SN74CBT3253CPW provides active undershoot protection up to –2 V on all A and B port terminals when the switch is disabled. This is achieved through internal sensing circuitry that forces the FET into a guaranteed OFF state during negative transients, preventing unintended conduction and protecting downstream logic. This specification is verified per the device's absolute maximum ratings and undershoot characteristics table in the official datasheet SCDS123B.
Does the SN74CBT3253CPW support bidirectional signal flow without direction control pins?
Yes, the SN74CBT3253CPW supports fully bidirectional signal flow between A and B ports without requiring direction control. Its FET-based architecture operates symmetrically - when enabled, signals pass with equal integrity in either direction, making it ideal for protocols like I²C and USB where data and clock lines are shared. Propagation delay remains identical (0.24 ns typical) regardless of signal direction, confirmed in the switching characteristics section of the datasheet.
Can the SN74CBT3253CPW be used in partial-power-down systems where VCC is disconnected?
Yes, the SN74CBT3253CPW features Ioff protection specifically designed for partial-power-down operation. When VCC = 0 V, Ioff leakage is limited to 10 µA maximum, preventing damaging current backflow from live I/O lines (up to 5.5 V) into the unpowered device. This allows safe isolation of powered subsystems - a critical requirement in modular industrial controllers and hot-swap architectures using the SN74CBT3253CPW.
What is the typical ON-state resistance (ron) of the SN74CBT3253CPW and how does it affect signal integrity?
The SN74CBT3253CPW has a typical ON-state resistance of 3 Ω at VCC = 4.5 V and IO = 30 mA. This low ron minimizes voltage drop and power dissipation, preserving signal amplitude and edge fidelity - especially critical for high-speed digital signals and low-level analog waveforms. At ±128 mA maximum continuous current, voltage drop stays below 400 mV, ensuring compatibility with TTL and CMOS logic thresholds across temperature.
Is the SN74CBT3253CPW compatible with 1.8 V and 3.3 V logic families when VCC is set to 5 V?
Yes, the SN74CBT3253CPW supports mixed-voltage operation: its data I/O ports tolerate 0 V to 5.5 V regardless of VCC, enabling direct interfacing with 1.8 V, 2.5 V, 3.3 V, and 5 V logic families while powered at 5 V. Control inputs (S0, S1, OE) accept TTL/CMOS-compatible thresholds (VIL ≤ 0.8 V, VIH ≥ 2 V), allowing drive from 3.3 V or 5 V sources without level shifters - a key advantage confirmed in the recommended operating conditions table.
SN74CBT3253CPW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CBT
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Type:
- Multiplexer/Demultiplexer
- Circuit:
- 2 x 4:1
- Independent Circuits:
- 1
- Current - Output High, Low:
- -
- Voltage Supply Source:
- Single Supply
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TSSOP
SN74CBT3253CPW FAQ
1.How can I place an order for SN74CBT3253CPW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CBT3253CPW 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 SN74CBT3253CPW reliable?
The price and inventory of SN74CBT3253CPW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBT3253CPW is usually 5 days.
3.What payment methods are accepted for SN74CBT3253CPW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74CBT3253CPW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74CBT3253CPW?
SN74CBT3253CPW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74CBT3253CPW 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 SN74CBT3253CPW?
For technical support, including SN74CBT3253CPW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBT3253CPW requirements.
6.How does Aetrix verify that SN74CBT3253CPW is sourced from the original manufacturer or authorized distributors?
All SN74CBT3253CPW 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 SN74CBT3253CPW meets industry standards.
7.What is the process for return or replacement of SN74CBT3253CPW?
All SN74CBT3253CPW units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBT3253CPW, 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 SN74CBT3253CPW part is unused and in its original packaging.
Return procedure for SN74CBT3253CPW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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