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Texas Instruments SN74CBT3253CD
- Part No.:
- SN74CBT3253CD
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SN74CBT3253CD.pdf
- Description:
- IC MUX/DEMUX 2 X 4:1 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:991
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Product details
Overview
SN74CBT3253CD 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, bidirectional signal flow, and 0.24 ns typical propagation delay. It enables high-speed I²C bus expansion and USB interface isolation in mixed-voltage systems.
For engineers reviewing the SN74CBT3253CD datasheet, SN74CBT3253CD pinout, SN74CBT3253CD application, or SN74CBT3253CD equivalent, key selection criteria include its SOIC-16 package, Ioff partial-power-down support, 5.5 pF typical OFF-state I/O capacitance, TTL/CMOS-compatible control inputs, and –2 V undershoot tolerance for robust signal integrity in hot-swap and level-shifting designs.
Technical Context
The SN74CBT3253CD integrates two independent 1-of-4 analog/digital switches with separate output-enable (1OE, 2OE) and dual select lines (S0, S1), enabling simultaneous or isolated channel routing. Each switch supports bidirectional data flow with near-zero propagation delay due to low-impedance FET architecture and minimal RC time constant.
Its active undershoot-protection circuitry monitors A/B port voltages and forces OFF-state isolation when transient undershoot reaches –2 V - critical for protecting downstream logic during hot-plug events. The device implements Ioff current limiting to prevent backflow during partial power-down, satisfying JESD 78 Class II latch-up immunity (>100 mA) and ESD robustness per JESD 22 (2000-V HBM, 1000-V CDM).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4 V to 5.5 V - ensures compatibility with 5-V TTL, 3.3-V, and mixed-signaling systems without level shifters. |
| ron (Typ) | 3 Ω - minimizes voltage drop and signal distortion for ±128 mA max channel current in high-speed digital/analog paths. |
| Cio(OFF) (Typ) | 5.5 pF - reduces capacitive loading and crosstalk in high-frequency bus isolation applications like I²C expansion. |
| tpd (Typ) | 0.24 ns - enables sub-nanosecond switching for timing-critical interfaces including USB 2.0 data gating and memory bus multiplexing. |
| Undershoot Tolerance | –2 V on A/B ports - guarantees reliable OFF-state isolation during transient negative excursions common in hot-swap and cable disconnect scenarios. |
| Ioff Max | 10 µA - prevents damaging back-current flow when VCC = 0 V, supporting safe partial-power-down operation in modular systems. |
| Operating Temp | –40°C to +85°C - validated for industrial-grade reliability in embedded controllers, test equipment, and communication infrastructure. |
Pinout & Package
SN74CBT3253CD is housed in a 16-pin SOIC (D) package measuring 9.9 mm × 3.91 mm × 1.45 mm (JEDEC MO-001AC), with gull-wing leads and NIPDAU lead finish. Pin 1 is located at the top-left corner adjacent to the index notch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 15, 16, 2 | A1–A4 (Channel Inputs/Outputs) | Bidirectional analog/digital ports for first multiplexer; connect to source signals or load nodes depending on OE/S state. |
| 3–6, 10–13 | B1–B4 (Channel Inputs/Outputs) | Bidirectional ports for second multiplexer; electrically identical to A-side but independently controlled. |
| 7, 14 | 1OE, 2OE (Output Enables) | Active-low enables; must be pulled high via resistor during power-up to ensure high-impedance default state. |
| 8, 9 | S0, S1 (Select Lines) | Binary address inputs selecting one of four B-port connections per multiplexer; TTL/CMOS compatible. |
| 4, 5 | VCC, GND | Single 4–5.5 V supply rail and ground reference; no separate analog/digital supplies required. |
Key Features
| Feature | Design Value |
|---|---|
| Undershoot Protection | –2 V clamping on all A/B I/Os ensures fail-safe OFF-state isolation during hot-plug transients without external diodes. |
| Ioff Partial-Power-Down | 10 µA max leakage at VCC = 0 V prevents back-current damage when system rails are sequenced or powered down asymmetrically. |
| Low Capacitance Switching | 5.5 pF typical OFF-state I/O capacitance minimizes signal reflection and timing skew in 50-MHz+ digital buses. |
| Multi-Voltage Signal Support | 0–5.5 V I/O range accommodates 0.8 V, 1.2 V, 1.5 V, 1.8 V, 2.5 V, 3.3 V, and 5 V logic families without level translation. |
| TTL/CMOS Control Compatibility | VIH = 2 V min and VIL = 0.8 V max allow direct drive from legacy TTL and modern 3.3-V/5-V CMOS outputs. |
Applications
| USB Interface Signal Gating | Industrial I²C Bus Expansion |
|---|---|
Use Scenario: Isolating USB D+/D– lines between host controller and peripheral modules during firmware updates or fault recovery. IC Role / Device Role / Timing Role: Bidirectional analog switch providing sub-ns propagation delay and <5.5 pF loading to preserve USB 2.0 signal integrity up to 480 Mbps. Use Value: Eliminates need for discrete MOSFETs and level shifters while maintaining full-speed USB compliance and hot-swap safety via –2 V undershoot protection. | Use Scenario: Adding slave devices to an existing I²C bus without exceeding capacitance limits or requiring bus repeaters. IC Role / Device Role / Timing Role: Dual 1-of-4 multiplexer enabling dynamic routing of SDA/SCL to up to eight peripherals across two independent I²C segments. Use Value: Extends I²C address space and reduces bus contention using only two control pins (S0/S1), with 3 Ω ron ensuring minimal voltage drop on pull-up resistors. |
| Memory Bus Multiplexing | Test Equipment Signal Routing |
Use Scenario: Sharing a single DDR memory controller between two independent memory banks in FPGA-based prototyping platforms. IC Role / Device Role / Timing Role: High-speed bus switch enabling glitch-free address/data line multiplexing with 0.24 ns tpd and 128 mA channel current capability. Use Value: Maintains setup/hold timing margins across memory interfaces while reducing PCB layer count versus discrete gate solutions. | Use Scenario: Reconfigurable signal path selection in automated test equipment (ATE) for probing multiple DUTs with shared instrumentation resources. IC Role / Device Role / Timing Role: Low-distortion analog/digital switch supporting DC–100 MHz signals with 5.5 pF OFF-capacitance and 3 Ω ON-resistance. Use Value: Enables precise, repeatable signal routing without introducing gain error or phase shift - critical for calibration-grade measurement accuracy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar FET multiplexer/demultiplexer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBTD3384CD | 10-bit non-inverting bus switch with 3.5 Ω ron, higher channel count, no undershoot protection. | Designed for wide parallel bus isolation (e.g., PCI, ISA), not dual 1-of-4 routing. | Choose when expanding data bus width is prioritized over selective channel addressing and transient protection. |
| TS3A227EYZTR | Single-supply 3.3-V SPDT analog switch with 0.7 Ω ron, 12-bit resolution support, no Ioff or undershoot protection. | Optimized for audio/low-noise analog switching, not digital bus expansion or hot-swap resilience. | Prefer for precision analog signal routing where low on-resistance outweighs industrial transient immunity requirements. |
Compared with SN74CBT3253CD, SN74CBTD3384CD offers greater channel density but lacks undershoot protection and independent dual-mux control, while TS3A227EYZTR delivers lower ron at 3.3 V but sacrifices Ioff, –2 V tolerance, and 4-channel flexibility - making SN74CBT3253CD uniquely suited for robust, mixed-voltage digital bus management.
Availability
SN74CBT3253CD is available at Aetrix Electronics and suitable for USB interface isolation, I²C bus expansion, memory bus multiplexing, and test equipment signal routing requiring stable component supply across industrial temperature ranges.
Supply support for SN74CBT3253CD 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 delivering analog, embedded processing, and connectivity solutions with emphasis on reliability, energy efficiency, and design enablement.
The SN74CBT3253CD belongs to TI's CBT (Crosspoint Bus Technology) family of high-speed FET bus switches, engineered specifically for low-distortion, low-latency signal routing in mixed-voltage digital systems and industrial interface expansion.
FAQ
What is the maximum undershoot voltage the SN74CBT3253CD can tolerate on its A and B ports?
The SN74CBT3253CD provides active undershoot protection up to –2 V on both A and B ports. This is achieved through internal sensing circuitry that maintains OFF-state isolation during transient negative excursions, preventing false turn-on and protecting downstream logic. This specification is verified per the absolute maximum ratings table and undershoot characteristics section of the official datasheet SCDS123B.
Does the SN74CBT3253CD support partial-power-down operation, and how is it implemented?
Yes, the SN74CBT3253CD supports partial-power-down operation via its Ioff feature. When VCC = 0 V, the device limits Ioff to 10 µA maximum, preventing damaging back-current flow from live I/Os into the unpowered device. This behavior is enabled by internal circuitry that disables the switch FETs and isolates the I/O paths, satisfying JESD 78 Class II latch-up immunity requirements.
What is the typical ON-state resistance (ron) of the SN74CBT3253CD, and under what conditions is it measured?
The typical ON-state resistance (ron) of the SN74CBT3253CD is 3 Ω, measured at VCC = 4.5 V, IO = 30 mA, and VI = 0 V. This value reflects the low-conduction impedance of the integrated FET switches and directly impacts voltage drop and signal fidelity in high-current digital or analog paths. The datasheet specifies ron ranging from 3 Ω to 12 Ω depending on VCC, current, and terminal voltage conditions.
Can the SN74CBT3253CD be used to route 1.8-V or 2.5-V logic signals while powered from a 5-V supply?
Yes, the SN74CBT3253CD supports 0–5.5 V signaling on its A and B I/O ports regardless of VCC (4–5.5 V), enabling seamless interfacing with 1.8-V, 2.5-V, 3.3-V, and 5-V logic families. Its data I/Os are voltage-translating and do not require external level shifters. Control inputs (S0, S1, OE) remain TTL/CMOS compatible with VIH ≥ 2 V and VIL ≤ 0.8 V.
What package type and lead finish does the SN74CBT3253CD use, and what is its moisture sensitivity level?
The SN74CBT3253CD uses a 16-pin SOIC (D) package with NIPDAU lead finish and meets RoHS compliance. Its moisture sensitivity level (MSL) is Level-1-260°C-UNLIM, meaning it has unlimited floor life and requires no baking prior to reflow soldering. The package dimensions are 9.9 mm × 3.91 mm × 1.45 mm, per JEDEC MO-001AC outline.
SN74CBT3253CD Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CBT
- Package/Case:
- 16-SOIC (0.154", 3.90mm 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-SOIC
SN74CBT3253CD FAQ
1.How can I place an order for SN74CBT3253CD through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CBT3253CD 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 SN74CBT3253CD reliable?
The price and inventory of SN74CBT3253CD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBT3253CD is usually 5 days.
3.What payment methods are accepted for SN74CBT3253CD?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74CBT3253CD transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74CBT3253CD?
SN74CBT3253CD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74CBT3253CD 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 SN74CBT3253CD?
For technical support, including SN74CBT3253CD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBT3253CD requirements.
6.How does Aetrix verify that SN74CBT3253CD is sourced from the original manufacturer or authorized distributors?
All SN74CBT3253CD 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 SN74CBT3253CD meets industry standards.
7.What is the process for return or replacement of SN74CBT3253CD?
All SN74CBT3253CD units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBT3253CD, 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 SN74CBT3253CD part is unused and in its original packaging.
Return procedure for SN74CBT3253CD:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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