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Product Detailed Parameters
- Description：IC BUS SWITCH 8 X 1:1 20TSSOP
- Series：74CB
- Mfr：Texas Instruments
- Package：Bulk,Tube
- Type：Bus Switch
- Circuit：8 x 1:1
- Independent Circuits：1
- Current - Output High, Low：-
- Voltage Supply Source：Single Supply
- Voltage - Supply：2.3V ~ 3.6V
- Operating Temperature：-40°C ~ 85°C
- Mounting Type：Surface Mount
- Package / Case：20-TSSOP (0.173", 4.40mm Width)
- Supplier Device Package：20-TSSOP
- Grade：-
- Qualification：-
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Overview
The SN74CB3Q3245PW is an 8-bit FET bus switch in a 20-pin TSSOP package. It operates on a single supply voltage ranging from 2.3V to 3.6V. The device features bidirectional data flow with near-zero propagation delay, typically 0.12ns to 0.20ns. It supports 5V tolerant I/Os even when powered down. The typical ON-state resistance is 4Ω, and the maximum switching frequency for the control input is 20MHz.
Feature Summary
- High-bandwidth data path supporting up to 500MHz
- Low and flat ON-state resistance characteristics over operating range
- Rail-to-rail switching capability on data I/O ports
- Ioff circuitry enables partial-power-down mode operation
Applications
- PCI Interface
- Differential Signal Interface
- Memory Interleaving
- Bus Isolation
- Low-Distortion Signal Gating
Procurement Notes
Verify the specific ordering suffix 'PW' corresponds to the TSSOP-20 package variant. Confirm current production status as datasheet addenda indicate this specific package option may be obsolete compared to tape-and-reel alternatives like PWR. Ensure compatibility with required thermal impedance and moisture sensitivity levels for the assembly process.
Selection Notes
Select this component for applications requiring low distortion and high bandwidth in broadband communications or networking systems. The charge pump mechanism ensures consistent performance across the voltage range. Verify that the 5V tolerant inputs align with the system's logic levels and that the 2.3V to 3.6V supply range matches the target power rail.
Part Context
This device belongs to the SN74CB3Q series of automotive-grade bus switches. It utilizes a charge pump to elevate gate voltage, providing low on-resistance. The Q-series designation indicates qualification for automotive applications, though specific AEC-Q100 certification details should be verified against the latest TI documentation.
Replacement Considerations
SN74CB3Q3245PWR (Tape & Reel version of same package)
FAQ
How does the device handle partial-power-down scenarios?
The integrated Ioff circuitry prevents damaging current backflow through the device when it is powered down, ensuring isolation during power-off states.
What is the maximum switching frequency for the control input?
The maximum switching frequency for the OE control input is 20MHz.
