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Texas Instruments SN74CBT3253DR
- Part No.:
- SN74CBT3253DR
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SN74CBT3253DR.pdf
- Description:
- IC MUX/DEMUX 2 X 4:1 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:14,779
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Product details
Overview
SN74CBT3253DR from Texas Instruments is a dual 1-of-4 high-speed TTL-compatible FET multiplexer/demultiplexer in SOIC-16 package, featuring 5 Ω typical on-state resistance at 4.5 V, <0.25 ns propagation delay (VCC = 5 V), and ±1 μA max input leakage current. It routes bidirectional data between one common A port and four B ports per channel under S0/S1 address control, used in high-speed bus switching and signal routing applications.
For engineers reviewing the SN74CBT3253DR datasheet, SN74CBT3253DR pinout, SN74CBT3253DR application, or SN74CBT3253DR equivalent, key selection criteria include its 4–5.5 V supply range, 128 mA continuous channel current rating, TTL-level compatible control inputs, and low-capacitance (10 pF) OE and A-port terminals for minimal loading in high-frequency digital systems.
Technical Context
This device implements two independent 1:4 analog/digital bidirectional switches using NMOS pass transistors with integrated level-shifting circuitry to ensure TTL-compatible input thresholds (VIH = 2 V min, VIL = 0.8 V max). Each channel has dedicated output-enable (1OE/2OE) and 2-bit binary select (S1/S0) inputs that jointly determine which of the four B-terminals connects to the A-terminal.
Switching is governed by a function table where low OE enables routing, and S1/S0 decode selects B1–B4; all unused controls must be tied to VCC or GND to prevent floating states. The architecture delivers rail-to-rail analog capability, sub-nanosecond timing, and low charge injection-critical for glitch-free data path reconfiguration in memory interfaces and test equipment.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage (VCC) | 4 V to 5.5 V - ensures compatibility with 5 V TTL and mixed-voltage logic systems without level shifters. |
| On-State Resistance (ron) | 5 Ω typical at VCC = 4.5 V, VI = 0 V - minimizes voltage drop and power loss during signal transmission. |
| Propagation Delay (tpd) | 0.25 ns max at VCC = 5 V - supports >1 GHz data rates in high-speed bus isolation and multiplexing. |
| Input Leakage Current (II) | ±1 μA max - reduces static power draw and prevents unintended biasing in high-impedance circuits. |
| Channel Current Rating | 128 mA continuous - enables robust signal routing for digital buses and low-power analog signals. |
| Control Input Capacitance (Ci) | 3.5 pF - limits capacitive loading on address/control lines, preserving rise/fall times in dense PCB layouts. |
| Off-State Capacitance (Cio) | 4 pF at OE = VCC - maintains high isolation (>50 dB at 100 MHz) between unselected channels. |
Pinout & Package
SN74CBT3253DR is housed in a 16-pin SOIC (D) package measuring 9.9 mm × 3.91 mm × 1.45 mm (max height), with standard 1.27 mm pitch and gull-wing leads. Pin 1 is located at the top-left corner adjacent to the index notch or dot marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE | Channel 1 Output Enable | Active-low enable: pulls 1A–1Bx path into high-impedance state when high; required for channel isolation. |
| S1, S0 | Binary Address Inputs (MSB/LSB) | Selects 1B1–1B4 or 2B1–2B4; S1 = high/low + S0 = high/low decodes 4:1 routing per channel. |
| 1A, 2A | Common Input/Output Terminals | Bidirectional ports: connect to shared data bus or controller I/O; tolerate rail-to-rail analog/digital signals. |
| 1B1–1B4, 2B1–2B4 | Channel-Specific Output/Input Terminals | Four selectable endpoints per channel; low capacitance (10 pF) ensures minimal signal degradation. |
| VCC, GND | Power Supply Pins | Single 4–5.5 V supply; internal ESD protection allows safe hot-swap operation in live backplanes. |
Key Features
| Feature | Design Value |
|---|---|
| TTL-Compatible Control Inputs | VIH = 2 V min / VIL = 0.8 V max - eliminates need for external level translators when interfacing with legacy 5 V logic. |
| Low On-State Resistance | 5 Ω typical - preserves signal integrity and reduces insertion loss in high-speed digital and analog paths. |
| Sub-Nanosecond Propagation Delay | 0.25 ns max - enables use in >1 GHz clock/data distribution networks without timing skew penalties. |
| Bidirectional Signal Routing | Fully symmetric A↔B conduction - supports flexible data flow direction without redesigning PCB traces. |
| Low Input/Output Capacitance | Ci = 3.5 pF, Cio(OFF) = 4 pF - minimizes loading on driving sources and improves high-frequency isolation. |
Applications
| PCI Express Gen1 Repeater Interface | Legacy Parallel Bus Isolation |
|---|---|
Use Scenario: Isolating PCIe reference clock and sideband signals between motherboard and add-in card during hot-plug events. IC Role / Device Role / Timing Role: Dual-channel bidirectional switch routing CLK/PERST#/WAKE# while blocking noise coupling between domains. Use Value: 5 Ω ron and 0.25 ns tpd maintain jitter <1 ps RMS and preserve PCIe Gen1 timing margins across connectors. |
Use Scenario: Enabling/disabling parallel data paths (e.g., ISA, LPC, or custom 8-bit bus) between microcontroller and peripheral ICs. IC Role / Device Role / Timing Role: 1-of-4 demux directing address/data lines to multiple peripherals without bus contention. Use Value: TTL-compatible S0/S1 inputs allow direct connection to MCU GPIOs; 128 mA rating handles full-bus drive strength. |
| Automotive Diagnostic Port Multiplexer | ATE Test Fixture Signal Routing |
Use Scenario: Switching OBD-II diagnostic lines (K-line, L-line, CAN-H/L) between ECU under test and tester interface hardware. IC Role / Device Role / Timing Role: Dual independent muxes isolate K-line (UART) and CAN physical layer during protocol arbitration. Use Value: −40°C to 85°C operating range meets automotive ambient requirements; 4 pF Cio(OFF) prevents cross-talk between protocols. |
Use Scenario: Reconfiguring probe connections across DUT pins in automated test equipment for functional validation of ASICs/FPGAs. IC Role / Device Role / Timing Role: High-speed bidirectional switch enabling dynamic signal path assignment without relay wear-out. Use Value: 0.25 ns tpd supports test vectors at >1 Gbps; low leakage (±1 μA) avoids false readings during high-impedance measurements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual 1-of-4 FET multiplexer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBTD3384D | Higher VCC range (3–5.5 V), 3.5 Ω ron, but requires external pull-up resistors on control inputs. | Preferred for 3.3 V–5 V mixed-supply systems; not pin-compatible due to different pinout and OE polarity. | Choose for lower on-resistance and wider supply flexibility; redesign PCB layout and control logic. |
| 74LVC1G3157DCKR | Single-channel, 5 V tolerant, 6 Ω ron, 3.5 ns tpd - slower and half the channel count. | Suitable only for single-path routing; lacks dual independent enables and address decoding logic. | Use when space-constrained and only one 1-of-4 path is needed; requires two units and external logic for dual functionality. |
Compared with SN74CBT3253DR, SN74CBTD3384D offers better on-resistance and supply range but demands layout changes and control redesign, while 74LVC1G3157DCKR provides footprint savings at the cost of halved channel density and degraded speed-neither is pin-compatible nor drop-in.
Availability
SN74CBT3253DR is available at Aetrix Electronics and suitable for PCI Express repeater interfaces, legacy parallel bus isolation, automotive diagnostic port multiplexing, and ATE test fixture signal routing requiring stable component supply across industrial temperature ranges.
Supply support for SN74CBT3253DR 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 company headquartered in Dallas, Texas, specializing in analog, embedded processing, and connectivity technologies with over 90 years of innovation in industrial, automotive, and communications markets.
The SN74CBT3253DR belongs to TI's CBT (Crosspoint Bus Transceiver) family, designed specifically for high-speed, low-distortion signal routing in digital bus architectures where minimal propagation delay and rail-to-rail analog capability are critical.
FAQ
What is the maximum operating temperature range for SN74CBT3253DR?
The SN74CBT3253DR is rated for operation from −40°C to +85°C ambient temperature, meeting industrial-grade thermal requirements. This range is validated per TI's recommended operating conditions and applies to all SOIC-packaged variants including SN74CBT3253DR. Thermal derating is not required within this span, and θJA for the D package is specified at 73°C/W.
Does SN74CBT3253DR support bidirectional signal flow between A and B ports?
Yes, SN74CBT3253DR supports fully bidirectional analog and digital signal routing between each A port and its corresponding B1–B4 terminals. Its FET-based switch architecture imposes no inherent directionality-voltage and current flow equally well from A to B or B to A, provided VCC remains within 4–5.5 V and voltage differentials stay within absolute maximum ratings.
Can unused control inputs on SN74CBT3253DR be left floating?
No, unused control inputs (S0, S1, 1OE, 2OE) on SN74CBT3253DR must be tied to either VCC or GND to ensure predictable operation. Floating inputs may cause partial turn-on of FET channels, leading to increased ICC, signal corruption, or latch-up risk. TI explicitly mandates this in Section "Recommended Operating Conditions" (Note 4) of the SN74CBT3253DR datasheet.
What is the typical on-state resistance of SN74CBT3253DR and how does it vary with voltage?
The typical on-state resistance (ron) of SN74CBT3253DR is 5 Ω at VCC = 4.5 V and VI = 0 V, rising to 10–15 Ω at VCC = 4.5 V and VI = 2.4 V. This variation reflects the FET's channel enhancement behavior: lower ron occurs near ground potential, increasing as the switched signal approaches VCC. Designers should use the 5 Ω value for worst-case voltage-drop calculations in low-VI scenarios.
Is SN74CBT3253DR pin-compatible with other members of the CBT3253 family?
Yes, SN74CBT3253DR shares identical pinout and function mapping with all CBT3253 variants in SOIC (D), SSOP (DB/DBQ), TSSOP (PW), and QFN (RGY) packages-including SN74CBT3253D, SN74CBT3253DBR, and SN74CBT3253PWR. Mechanical dimensions differ by package type, but electrical pin assignments, logic behavior, and thermal characteristics are consistent across the family per TI's SCDS018O datasheet.
SN74CBT3253DR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CBT
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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
SN74CBT3253DR FAQ
1.How can I place an order for SN74CBT3253DR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CBT3253DR 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 SN74CBT3253DR reliable?
The price and inventory of SN74CBT3253DR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBT3253DR is usually 5 days.
3.What payment methods are accepted for SN74CBT3253DR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74CBT3253DR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74CBT3253DR?
SN74CBT3253DR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74CBT3253DR 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 SN74CBT3253DR?
For technical support, including SN74CBT3253DR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBT3253DR requirements.
6.How does Aetrix verify that SN74CBT3253DR is sourced from the original manufacturer or authorized distributors?
All SN74CBT3253DR 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 SN74CBT3253DR meets industry standards.
7.What is the process for return or replacement of SN74CBT3253DR?
All SN74CBT3253DR units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBT3253DR, 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 SN74CBT3253DR part is unused and in its original packaging.
Return procedure for SN74CBT3253DR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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