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CD74HCT646E
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Product Detailed Parameters
- Description：IC TXRX NON-INVERT 5.5V 24DIP
- Series：74HCT
- Mfr：Harris Corporation
- Package：Bulk
- Logic Type：Transceiver, Non-Inverting
- Number of Elements：1
- Number of Bits per Element：8
- Input Type：-
- Output Type：3-State
- Current - Output High, Low：6mA, 6mA
- Voltage - Supply：4.5V ~ 5.5V
- Operating Temperature：-55°C ~ 125°C (TA)
- Mounting Type：Through Hole
- Package / Case：24-DIP (0.300", 7.62mm)
- Supplier Device Package：24-DIP
- Grade：-
- Qualification：-
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Overview
The CD74HCT646E is an octal registered bus transceiver manufactured by Harris Corporation, belonging to the HCT CMOS logic series. It features a single functional unit with eight bits per element and true output polarity. The device supports bidirectional data transmission with independent direction control, allowing for multiplexed transmission of registered or real-time data. It operates within a supply voltage range of 4.5V to 5.5V and provides three-state outputs. The component is housed in a 24-pin Plastic Dual In-Line Package (PDIP) and is rated for an operating temperature range from -55°C to +125°C.
Feature Summary
- Octal Registered Bus Transceiver
- Bidirectional Data Transmission
- Three-State Outputs
- Independent Direction Control
Applications
- Multiplexed data transmission systems
- Registered bus interfaces
- High-speed CMOS logic circuits
Procurement Notes
Verify manufacturer origin as Harris Corporation, noting that this part number may also be produced by Texas Instruments or other entities under license. Confirm package type is PDIP-24 and logic family is HCT. Check RoHS compliance status as historical Harris parts may not meet current standards. Ensure operating temperature range matches application requirements of -55°C to +125°C.
Selection Notes
Select this component when an octal registered bus transceiver with HCT compatibility is required. It is suitable for applications needing bidirectional data flow with registered storage capabilities. The wide industrial temperature range makes it appropriate for harsh environments. Ensure system voltage aligns with the 4.5V to 5.5V specification.
Part Context
This component is part of the broader 74HCT646 family of octal bus transceivers. Similar variants include the CD74HCT646M in SOIC packaging and the CD74HC646EX in DIP format. These devices share core functionality but differ in package style and specific electrical characteristics associated with HC versus HCT logic families.
Replacement Considerations
Direct substitutes include CD74HCT646M (SOIC-24) and CD74HCT646EN (PDIP-24). Verify pinout compatibility and package dimensions before substitution. Cross-reference with NXP 74HCT646 for equivalent functionality.
