SN74CB3Q3253PWG4 Texas Instruments Integrated Circuit (Small Outline Packages) In Stock
The SN74CB3Q3253PWG4 is a Texas Instruments dual 4-bit 2:1 CMOS bus switch and multiplexer/demultiplexer with bidirectional data flow, active-low enable control, and 50 pF load capacitance rating in a 16-pin TSSOP package. Competitively priced and in stock with worldwide shipping for digital bus switching designs.
- Manufacturer
- Texas Instruments
- Package
- Small Outline Packages
- Pin Count
- 16
- Lifecycle
- OBSOLETE
- Datasheet
- SN74CB3Q3253PWG4 Datasheet PDF
- Category
- Integrated Circuit
- Temp Range
- -40.0°C to 85.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of SN74CB3Q3253PWG4?
- Dual 4-bit 2:1 mux/demux architecture with bidirectional data flow enables flexible bus switching and signal routing in 16 pins
- Active-low enable control with near-zero propagation delay provides transparent bus connection characteristic ideal for hot-swap and bus isolation
- 50 pF rated load capacitance and CB3Q family low on-resistance support high-speed digital interfaces with minimal signal degradation
- 16-pin TSSOP package and 3.3 V operation simplify integration into compact logic-level bus-sharing designs
What is SN74CB3Q3253PWG4 used for?
The SN74CB3Q3253PWG4 is used in data bus sharing architectures for microprocessor systems, memory address multiplexing, and PCIe or USB signal switching where two sources must share a common 4-bit bus. Its bidirectional transparent switch characteristic allows seamless substitution for a decoded address or data path selector without extra level-shifting hardware. The TSSOP-16 package is well suited for space-constrained motherboard and embedded computing designs requiring clean high-speed bus isolation.
What are the specifications of SN74CB3Q3253PWG4?
| YTEOL | 0 |
| Control Type | ENABLE LOW |
| Count Direction | BIDIRECTIONAL |
| Family | CB3Q/3VH/3C/2B |
| JESD-30 Code | R-PDSO-G16 |
| JESD-609 Code | e4 |
| Load Capacitance (CL) | 50pF |
| Logic IC Type | BUS EXCHANGER |
| Number of Bits | 4 |
| Number of Functions | 2 |
| Number of Ports | 3 |
| Output Characteristics | 3-STATE |
| Output Polarity | TRUE |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | TSSOP16,.25 |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE, THIN PROFILE, SHRINK PITCH |
| Peak Reflow Temperature (Cel) | 260 |
| Power Supply Current-Max (ICC) | 1.5mA |
| Prop. Delay@Nom-Sup | 0.18ns |
| Propagation Delay (tpd) | 0.18ns |
| Qualification Status | Not Qualified |
| Supply Voltage-Max (Vsup) | 3.6V |
| Supply Voltage-Min (Vsup) | 2.3V |
| Supply Voltage-Nom (Vsup) | 2.5V |
| Surface Mount | YES |
| Technology | CMOS |
| Temperature Grade | INDUSTRIAL |
| Terminal Finish | NICKEL PALLADIUM GOLD |
| Terminal Form | GULL WING |
| Terminal Pitch | 0.65mm |
| Terminal Position | DUAL |
| Time@Peak Reflow Temperature-Max (s) | 30 |
| Package | Small Outline Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 1 |
| HTS Code | 8542.39.00.60 |
Where can I find the SN74CB3Q3253PWG4 datasheet?
SN74CB3Q3253PWG4 Datasheet DownloadOfficial datasheet from Texas Instruments
What are equivalent replacements for SN74CB3Q3253PWG4?
Compatible alternatives and drop-in replacements for SN74CB3Q3253PWG4:
Bus Exchanger, CB3Q/3VH/3C/2B Series, 2-Func, 4-Bit, True Output, CMOS, PDSO16
Frequently Asked Questions
How does the bidirectional operation of SN74CB3Q3253PWG4 differ from a unidirectional multiplexer in a shared bus design?
The SN74CB3Q3253PWG4 operates as a transparent bus switch that passes signals in both directions simultaneously when enabled, unlike a unidirectional mux that can only route data from a fixed input to a fixed output. This bidirectional capability allows the device to arbitrate a shared 4-bit data bus between two masters without requiring separate transmit and receive paths, reducing component count by at least half compared to paired unidirectional solutions.
What load capacitance is SN74CB3Q3253PWG4 rated for, and how does that limit the number of bus loads it can drive?
The device is rated for 50 pF load capacitance per channel, which is the maximum capacitive load recommended to maintain specified propagation delay and signal integrity at operating frequency. Designers connecting to a heavily loaded PCB bus with multiple CMOS receiver inputs should ensure total trace and pin capacitance stays below 50 pF per channel, or use a buffered driver downstream to preserve timing margins.
In a 3.3 V processor system, how does SN74CB3Q3253PWG4 enable two different peripherals to share a single 4-bit address bus?
When the active-low enable input is asserted, all 4 bits of the selected input channel connect directly to the output bus with near-zero added voltage drop. The dual 2:1 structure lets the processor toggle between two 4-bit peripheral address decoders by driving the select line high or low, effectively time-multiplexing a single 4-bit bus across two devices without signal contention or voltage level translation at 3.3 V.
How does the 16-pin TSSOP package of SN74CB3Q3253PWG4 compare to a SOIC-16 when routing high-speed bus signals on a PCB?
The TSSOP-16 package has a 0.65 mm pin pitch versus the 1.27 mm pitch of a standard SOIC-16, reducing the physical footprint by roughly 50% in area and shortening trace lengths between switch pins and connected logic. Shorter PCB traces directly lower parasitic capacitance and inductance, improving signal integrity at bus frequencies above 100 MHz and making TSSOP the preferred choice in high-density, high-speed digital board designs.
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About Texas Instruments
Texas Instruments (TI) is a global semiconductor company headquartered in Dallas, Texas. TI designs and manufactures analog and embedded processing chips used in industrial, automotive, consumer, communications, and enterprise systems.
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