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Product Detailed Parameters
- Description：SERIAL I/O CONTROLLER, 2 CHANNEL
- Series：*
- Mfr：Rochester Electronics, LLC
- Package：Bulk
- Features：-
- Number of Channels：-
- FIFO's：-
- Protocol：-
- Data Rate (Max)：-
- Voltage - Supply：-
- With Auto Flow Control：-
- With IrDA Encoder/Decoder：-
- With False Start Bit Detection：-
- With Modem Control：-
- Mounting Type：-
- Package / Case：-
- Supplier Device Package：-
- Grade：-
- Qualification：-
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Overview
The MD8251A is a high-speed CMOS quad bus transceiver manufactured by Rochester Electronics, LLC. It functions as a bidirectional data translator for eight-bit data transmission between two buses powered by separate voltage domains. The device supports multiple supply voltage ranges, typically accommodating 2.7V to 3.6V and 4.5V to 5.5V configurations. It features three-state outputs to isolate the bus when disabled. The component utilizes advanced CMOS technology to ensure low power consumption while maintaining high-speed signal integrity for system interconnect applications.
Feature Summary
- Bidirectional data translation between independent voltage domains
- Three-state outputs for effective bus isolation
- High-speed CMOS technology for low power operation
Applications
- System interconnects requiring level shifting
- Bus-oriented communications
- Post-processor clock buffering
Procurement Notes
Verify the specific suffix codes on the physical component against the official datasheet to confirm pinout compatibility and electrical specifications. Ensure the package type matches the target PCB footprint. Confirm RoHS compliance status if required by the manufacturing environment. Validate that the manufacturer designation aligns with current inventory records.
Selection Notes
Select this component when bidirectional level shifting between different logic families or voltage domains is required. Ensure the operating voltage range of the target application falls within the specified limits for both VCCA and VCCB supplies. Consider the propagation delay characteristics relative to the system clock speed. Verify that the package dimensions fit the available board space constraints.
Part Context
Rochester Electronics specializes in sourcing and distributing obsolete and hard-to-find semiconductor components. The MD8251A represents a continuation of legacy Texas Instruments designs, ensuring availability for long-life products. This part serves as a critical interface element in systems utilizing older bus architectures or requiring robust voltage translation capabilities.
Replacement Considerations
The original manufacturer equivalent is the SN74LVC2T45DCUR or similar variants from Texas Instruments. Verify pin compatibility and electrical parameters before substitution. Other manufacturers may offer functionally equivalent parts, but careful validation of timing and voltage levels is necessary.
