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Texas Instruments SN74CBT3253DBQR
- Part No.:
- SN74CBT3253DBQR
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
SN74CBT3253DBQR.pdf
- Description:
- IC MUX/DEMUX 2 X 4:1 16SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,455
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Product details
Overview
SN74CBT3253DBQR from Texas Instruments is a dual 1-of-4 high-speed TTL-compatible FET multiplexer/demultiplexer in SSOP (DBQ) package with 16 pins. It features 5 Ω typical on-state resistance at VCC = 4.5 V, 0.25 ns propagation delay (VCC = 5 V), and supports bidirectional signal routing for data path switching in bus isolation applications.
For engineers reviewing the SN74CBT3253DBQR datasheet, SN74CBT3253DBQR pinout, SN74CBT3253DBQR application, or SN74CBT3253DBQR equivalent, key selection criteria include its low on-resistance, sub-nanosecond switching speed, TTL-level control compatibility, and dual independent 1:4 channel configuration for compact I/O expansion.
Technical Context
The SN74CBT3253DBQR implements two independent FET-based analog switches, each selecting one of four B-port terminals (1B1–1B4 or 2B1–2B4) to connect bidirectionally with its respective A-port terminal (1A or 2A) under S0/S1 address control. Enable inputs (1OE/2OE) provide per-channel disable capability with high-impedance OFF-state.
Its TTL-compatible control interface accepts VIH ≥ 2 V and VIL ≤ 0.8 V over −40°C to 85°C, while the switch core operates across VCC = 4 V to 5.5 V. The device exhibits 4 pF OFF-state capacitance (Cio(OFF)) and 10 pF input capacitance (Ci), minimizing capacitive loading on driven buses.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4 V to 5.5 V - ensures compatibility with 5-V logic systems and margin against supply droop |
| ron (Typ) | 5 Ω at VCC = 4.5 V, VI = 0 V - enables low-loss signal transmission with minimal voltage drop |
| tpd (Max) | 0.25 ns at VCC = 5 V - supports high-speed digital bus switching without timing skew |
| Cio(OFF) | 4 pF - reduces crosstalk and maintains signal integrity when channels are disabled |
| VIH / VIL | 2 V / 0.8 V - guarantees reliable recognition of standard TTL logic levels |
| Operating Temp | −40°C to +85°C - validated for industrial-grade embedded and communication equipment |
| ICC (Max) | 3 μA - delivers ultra-low static power consumption during active operation |
Pinout & Package
SN74CBT3253DBQR uses a 16-pin SSOP (Shrink Small-Outline Package) with 0.65 mm pitch, 5.0 mm × 6.2 mm body size, and 1.75 mm max height per JEDEC MO-137 variation AB.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE | Channel enable inputs | Active-low enables independently disable 1A/1Bx or 2A/2Bx paths to high-impedance state |
| S0, S1 | Address select inputs | Binary-coded selection of 1-of-4 B-port connections per A-port (L/L = B1, H/H = B4) |
| 1A, 2A | Common input/output terminals | Bidirectional ports serving as multiplexed sources or demultiplexed sinks |
| 1B1–1B4, 2B1–2B4 | Channel output/input terminals | Four selectable bidirectional paths per channel; no internal termination or biasing |
| VCC, GND | Power supply pins | Single 5-V supply required; no separate analog/digital rails or reference needed |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional signal routing | Enables reuse of same device for mux or demux roles without redesigning PCB layout |
| TTL-compatible control inputs | Eliminates need for level-shifting circuitry when interfacing with legacy 5-V microcontrollers |
| Low on-state resistance (5 Ω typ) | Maintains signal amplitude integrity for analog or digital signals up to 128 mA channel current |
| Sub-nanosecond propagation delay | Preserves timing margins in high-frequency data buses such as parallel memory interfaces |
| 4 pF OFF-state capacitance | Minimizes capacitive loading on inactive channels, reducing crosstalk in dense routing |
Applications
| Bus Isolation | Memory Address Multiplexing |
|---|---|
Use Scenario: Isolating shared data/address buses between microcontroller and peripheral ICs during power-down or fault conditions. IC Role / Device Role / Timing Role: Bidirectional analog switch providing galvanic separation with minimal signal degradation. Use Value: Prevents back-driving and leakage currents while maintaining <0.25 ns timing alignment across enabled channels. | Use Scenario: Expanding limited GPIO count to drive 4-bit address lines for external SRAM or flash memory chips. IC Role / Device Role / Timing Role: Dual 1-of-4 selector routing controller outputs to distinct memory bank selects. Use Value: Enables single-cycle address decoding with 5 Ω Ron ensuring full logic swing delivery to memory enable inputs. |
| I/O Port Expansion | Test Access Multiplexing |
Use Scenario: Adding configurable digital I/O capability to FPGA or MCU designs with constrained pin count. IC Role / Device Role / Timing Role: Signal path selector enabling dynamic reassignment of physical pins to logical functions. Use Value: Supports real-time reconfiguration with <1 ns enable/disable times (ten/tdis) and zero hold-time requirements. | Use Scenario: Routing JTAG or boundary-scan test signals between multiple ASICs on a shared test bus. IC Role / Device Role / Timing Role: Low-capacitance channel switch isolating test access points during normal operation. Use Value: 4 pF Cio(OFF) prevents signal coupling between unselected devices, preserving test vector accuracy. |
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 |
|---|---|---|---|
| SN74CBT3253DBR | Same silicon die, DB package (0.635 mm pitch, 4.9 mm × 6.0 mm); θJA = 82°C/W vs. 90°C/W for DBQ | Compatible pinout but larger footprint; preferred where thermal margin > PCB area efficiency | Select SN74CBT3253DBR for higher-power-density layouts requiring better thermal dissipation |
| SN74CBT3253DR | D package (SOIC, 1.27 mm pitch, 6.0 mm × 10.2 mm); θJA = 73°C/W; identical electrical specs | Larger board area; easier hand-soldering and probe access; lower assembly cost in low-volume builds | Choose SN74CBT3253DR when manual rework, test probing, or legacy SOIC compatibility is prioritized |
Compared with SN74CBT3253DBQR, SN74CBT3253DBR offers improved thermal performance in a slightly larger SSOP footprint, while SN74CBT3253DR provides SOIC mechanical compatibility and superior heat dissipation-both retain identical switching characteristics and TTL-level control behavior.
Availability
SN74CBT3253DBQR is available at Aetrix Electronics and suitable for bus isolation, memory address multiplexing, and I/O port expansion requiring stable component supply in industrial control, test instrumentation, and legacy system upgrades.
Supply support for SN74CBT3253DBQR 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 U.S.-based semiconductor company specializing in analog and embedded processing technologies, with leadership in interface, logic, and power management solutions.
The SN74CBT3253DBQR belongs to TI's CBT (Crossbar Bus Transceiver) logic family, designed specifically for high-speed, low-distortion signal routing in 5-V digital systems with strict timing and impedance requirements.
FAQ
What is the maximum continuous current rating for each channel of the SN74CBT3253DBQR?
The SN74CBT3253DBQR supports a continuous channel current of 128 mA per switch path. This rating applies under recommended operating conditions (VCC = 4 V to 5.5 V, TA = −40°C to 85°C) and ensures reliable conduction without thermal runaway or parameter shift. Exceeding this value may degrade on-resistance stability or accelerate wear-out mechanisms in the integrated FET structure.
Does the SN74CBT3253DBQR require external pull-up or pull-down resistors on its control inputs?
No, the SN74CBT3253DBQR does not require external pull-up or pull-down resistors on S0, S1, 1OE, or 2OE inputs. Its TTL-compatible control interface specifies VIH ≥ 2 V and VIL ≤ 0.8 V, and all unused control inputs must be held at VCC or GND per TI application report SCBA004 to prevent floating-node oscillation and increased ICC.
Can the SN74CBT3253DBQR operate with a 3.3-V supply voltage?
No, the SN74CBT3253DBQR is not rated for 3.3-V operation. Its recommended VCC range is 4 V to 5.5 V, and absolute maximum ratings specify −0.5 V to 7 V. At 3.3 V, the device fails to meet VIH/VIL thresholds, resulting in undefined switching behavior and potential failure to assert valid logic states on the B ports.
What is the OFF-state capacitance of the SN74CBT3253DBQR, and why does it matter?
The SN74CBT3253DBQR has an OFF-state capacitance (Cio(OFF)) of 4 pF per B-port terminal when OE = VCC. This low value minimizes capacitive loading on adjacent traces or unselected devices in shared-bus configurations, directly reducing crosstalk, signal distortion, and timing uncertainty in high-speed digital systems.
Is the SN74CBT3253DBQR pin-compatible with other packages in the same part number family?
Yes, the SN74CBT3253DBQR shares identical pinout and functionality with SN74CBT3253DBR (SSOP-DB), SN74CBT3253DR (SOIC-D), and SN74CBT3253PWR (TSSOP-PW). All variants use the same 16-pin assignment per the logic diagram and function table, enabling direct PCB footprint substitution where mechanical constraints allow.
SN74CBT3253DBQR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CBT
- Package/Case:
- 16-SSOP (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-SSOP
SN74CBT3253DBQR FAQ
1.How can I place an order for SN74CBT3253DBQR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CBT3253DBQR 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 SN74CBT3253DBQR reliable?
The price and inventory of SN74CBT3253DBQR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBT3253DBQR is usually 5 days.
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Once your SN74CBT3253DBQR 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 SN74CBT3253DBQR?
For technical support, including SN74CBT3253DBQR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBT3253DBQR requirements.
6.How does Aetrix verify that SN74CBT3253DBQR is sourced from the original manufacturer or authorized distributors?
All SN74CBT3253DBQR 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 SN74CBT3253DBQR meets industry standards.
7.What is the process for return or replacement of SN74CBT3253DBQR?
All SN74CBT3253DBQR units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBT3253DBQR, 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 SN74CBT3253DBQR part is unused and in its original packaging.
Return procedure for SN74CBT3253DBQR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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