74CB3Q3257DBQRG4 Texas Instruments Integrated Circuit (Small Outline Packages) In Stock
74CB3Q3257DBQRG4 is a quad 2:1 bidirectional bus-exchange multiplexer/demultiplexer from Texas Instruments in a 16-pin SSOP package. It operates at 1.65 V to 3.6 V with near-zero propagation delay for transparent signal routing. From $0.60 in stock with worldwide shipping.
- Manufacturer
- Texas Instruments
- Package
- Small Outline Packages
- Pin Count
- 16
- Lifecycle
- OBSOLETE
- Datasheet
- 74CB3Q3257DBQRG4 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
Key Features
- Quad 2:1 bidirectional mux/demux routes 4-bit buses with near-zero propagation delay for transparent switching
- 1.65 V to 3.6 V supply range makes it compatible with 1.8 V and 3.3 V mixed-voltage bus interfaces
- 50 pF load drive capability and active bus-hold inputs prevent floating lines in bidirectional signal paths
Applications
The 74CB3Q3257DBQRG4 is used in memory interface routing, peripheral bus switching, and data path multiplexing on boards where a 4-bit bus must be shared between two sources. Its near-zero propagation delay and bidirectional operation make it suitable for DDR memory address switching, I2C/SPI bus sharing, and FPGA I/O expansion in 1.8 V or 3.3 V systems. The compact 16-pin SSOP footprint fits easily on space-constrained PCBs in networking, storage, and embedded computing designs.
Specifications
| 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 | 2 |
| Number of Functions | 4 |
| Number of Ports | 3 |
| Output Characteristics | 3-STATE |
| Output Polarity | TRUE |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | SSOP16,.25 |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE, SHRINK PITCH |
| Packing Method | TR |
| Peak Reflow Temperature (Cel) | 260 |
| Power Supply Current-Max (ICC) | 0.7mA |
| Prop. Delay@Nom-Sup | 0.2ns |
| Propagation Delay (tpd) | 0.2ns |
| 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 | 0.635mm |
| 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 2 |
| HTS Code | 8542.39.00.60 |
Alternate & Equivalent Parts
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
At what supply voltage does 74CB3Q3257DBQRG4 operate, and how many signal bits does it switch?
The 74CB3Q3257DBQRG4 operates from 1.65 V to 3.6 V and switches 4 independent bidirectional signal bits in a quad 2:1 configuration. This makes it suitable for routing 4-bit wide data buses between two sources at either 1.8 V or 3.3 V logic levels without requiring any additional level-translation circuitry in mixed-supply system designs.
How does 74CB3Q3257DBQRG4 prevent signal integrity issues on floating bus lines?
The 74CB3Q3257DBQRG4 includes active bus-hold inputs on each channel that maintain the last driven logic state when the bus is released, preventing high-impedance lines from floating and causing spurious transitions. This feature eliminates the need for external pull-up or pull-down resistors on undriven bus segments, reducing component count by up to 8 resistors in a typical 4-bit bus-sharing design.
How does 74CB3Q3257DBQRG4 compare to a 74HC257 for 3.3 V FPGA peripheral multiplexing?
Unlike the 74HC257 which is unidirectional and limited to 6 V supply, the 74CB3Q3257DBQRG4 supports fully bidirectional operation at 1.65 V to 3.6 V with near-zero propagation delay, making it a much better fit for 3.3 V FPGA I/O banks where read and write cycles share the same signal pins. The 50 pF load drive capability also supports bus trace lengths up to approximately 10 cm without signal degradation at typical FPGA frequencies.
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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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