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CD74FCT646EN
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Product Detailed Parameters
- Description：OCTAL BUS TRANSCEIVER
- Series：*
- Mfr：Texas Instruments
- Package：Bulk
- Logic Type：-
- Number of Elements：-
- Number of Bits per Element：-
- Input Type：-
- Output Type：-
- Current - Output High, Low：-
- Voltage - Supply：-
- Operating Temperature：-
- Mounting Type：-
- Package / Case：-
- Supplier Device Package：-
- Grade：-
- Qualification：-
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Overview
The CD74FCT646EN is an octal registered bus transceiver manufactured by Texas Instruments, belonging to the FCT logic series. It features a single functional circuit with eight bidirectional channels and non-inverting polarity. The device utilizes a 24-pin PDIP package for through-hole mounting. It operates within a supply voltage range of 4.75 V to 5.25 V and supports TTL input levels with TTL output levels. Key electrical parameters include a propagation delay of 9 ns, a low-level output current of 64 mA, and a high-level output current of -32 mA. The component functions as a three-state output buffer and is rated for an operating temperature range from -40 °C to +85 °C.
Feature Summary
- Octal Registered Bus Transceiver
- Three-State Outputs
- Non-Inverting Polarity
- TTL Input/Output Levels
Applications
- Bidirectional data bus buffering
- Memory register interfacing
- Control signal distribution
Procurement Notes
Verify the specific manufacturer source, as the CD74 prefix indicates Texas Instruments but historical production may involve other entities like Harris Semiconductor. Confirm the PDIP-24 package type matches the design requirements. Check RoHS compliance status against current environmental regulations. Ensure the TTL input/output compatibility aligns with the system logic family. Validate the operating temperature range suitability for the intended environment.
Selection Notes
Select this component when an octal registered transceiver with high drive capability is required. The 64 mA low-level output current supports heavy capacitive loads. The registered feature allows for multiplexed transmission of real-time or registered data. Ensure the PCB layout accommodates the 24-pin DIP footprint. Verify that the 4.75 V to 5.25 V supply voltage is stable in the target application.
Part Context
This part belongs to the 74FCT series of high-speed CMOS logic devices. It serves as a registered version of the standard bus transceiver, providing storage capability for the data lines. The FCT technology offers speed comparable to LS-TTL with CMOS power consumption characteristics. It is designed for applications requiring reliable data transfer across wide buses.
Replacement Considerations
Consider the CY74FCT646TSOCT for surface mount implementations. The CD74ACT646M96 offers similar functionality but with ACT series specifications. Verify pinout compatibility before substituting with generic 74FCT646 equivalents.
