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Product Detailed Parameters
- Description：IC BUS SWITCH 4 X 1:1 20QSOP
- Series：74FST
- Mfr：onsemi
- Package：Tape & Reel (TR),Bulk
- Type：Bus Switch
- Circuit：4 x 1:1
- Independent Circuits：2
- Current - Output High, Low：-
- Voltage Supply Source：Single Supply
- Voltage - Supply：4V ~ 5.5V
- Operating Temperature：-40°C ~ 85°C
- Mounting Type：Surface Mount
- Package / Case：20-SSOP (0.154", 3.90mm Width)
- Supplier Device Package：20-QSOP
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Overview
The 74FST3244QSR is an 8-bit bus switch manufactured by onsemi, housed in a QSOP-20 package. It operates between 4.0 and 5.5 volts with CMOS TTL compatibility. The device features two independent 4-bit switches controlled by separate Output/Enable (OE) pins. Key electrical characteristics include a typical on-resistance of 4 ohms, maximum propagation delay of 0.25 ns, nearly zero standby current, and no circuit bounce.
Feature Summary
- Provides high-performance switching with extremely low on-resistance and negligible propagation delay.
- Features separate enable control for two distinct 4-bit switch sections to manage data flow independently.
- Designed to operate without introducing noise or ground bounce into the system during transitions.
Applications
- Asynchronous communication between data buses
- High-speed signal routing in digital systems
- Bus isolation and direction control
Procurement Notes
Verify that the suffix QSR corresponds specifically to the QSOP-20 tape and reel packaging configuration. Confirm RoHS compliance status as TSSOP variants are inherently lead-free while other packages may differ. Ensure the ordering number matches the specific manufacturer part number to avoid pinout or electrical characteristic mismatches.
Selection Notes
Select this component when an 8-bit bidirectional switch with FST logic speed is required. It serves as a pin-for-pin compatible alternative to QS3244, FST3244, and CBT3244 devices. Consider the QSOP-20 form factor if surface mount space constraints align with its dimensions.
Part Context
This device belongs to the 74FST series of high-speed bus switches from onsemi. It utilizes Fast Switching Technology to deliver performance comparable to faster logic families while maintaining standard voltage compatibility. The family is designed for applications requiring minimal signal distortion and high throughput.
Replacement Considerations
Pin-for-pin compatible substitutes include QS3244, FST3244, and CBT3244. Verify that replacement parts match the specific operating voltage range and package type before integration.
FAQ
How does the device handle bus isolation?
When the Output/Enable (OE) pin is high, the switch enters a high-impedance state, effectively isolating Port A from Port B.
What is the maximum propagation delay?
The maximum propagation delay through the switch is 0.25 ns under recommended operating conditions.
