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CDP1856CDX
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Product Detailed Parameters
- Description：HIGH RELIABILITY 4 BIT BUS BUFFE
- Series：*
- Mfr：Harris Corporation
- 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 CD74HCT646M is a high-speed CMOS octal bus transceiver manufactured by Harris Corporation, housed in a 24-SOIC package. It operates within a supply voltage range of 4.5V to 5.5V and supports data rates up to 30MHz. The device features non-inverting logic with tri-state outputs, providing 6mA drive capability for both high and low states. Designed for surface mount installation, it functions reliably across an extended temperature range from -55°C to 125°C.
Feature Summary
- Provides bidirectional data transmission between two buses using non-inverting logic
- Features tri-state outputs that isolate the bus when disabled
- Supports high-speed operation suitable for memory and microprocessor systems
Applications
- Memory mapping control circuits
- Clock drivers
- Bus-oriented architectures
Procurement Notes
Verify RoHS compliance status as the component may not meet current environmental standards. Confirm the manufacturer origin, noting potential production by Harris or subsequent licensees like Rochester Electronics. Ensure the 24-SOIC package dimensions match your PCB footprint requirements before finalizing procurement orders.
Selection Notes
Select this component for designs requiring robust bidirectional data transfer with high noise immunity. The HCT series compatibility ensures direct interface with TTL logic levels. Consider the wide operating temperature range for industrial applications. Verify power supply stability within the specified voltage limits to maintain signal integrity during high-speed switching operations.
Part Context
This part belongs to the 74HCT logic family, known for CMOS speed with TTL-compatible inputs. It serves as a critical interface element in digital systems, facilitating efficient data flow between processors and peripheral devices. The specific model designation indicates its octal configuration and non-inverting nature within the broader catalog of bus transceivers.
Replacement Considerations
Check for equivalents such as the SN74HCT646 or MC74HCT646. Ensure pinout compatibility and electrical specifications match exactly. Verify that any substitute maintains the same tri-state functionality and voltage tolerance levels required by the original design.
