BH9595FP-YE2

Overview

The BH9595FP-YE2 is a SCSI active terminator manufactured by ROHM Semiconductor, designed to replace conventional discrete terminators. It provides active termination for 18-line SCSI interfaces with an internal 2.85V power supply and push-pull operation. The device operates on a TERM power supply (VDD1) ranging from 4.0V to 5.5V, with transient tolerance up to 6.0V. Key electrical parameters include a standby current of 1.0mA to 2.0mA at VDD1=5.5V, SCSI equivalent resistance of 105Ω to 115Ω, and total sink/drain currents of 300mA to 550mA. It features an enable pin that activates the terminator at LOW level and switches to High-Z state at HIGH level. The component is housed in a HSOP-25 package measuring 13.6mm x 5.4mm x 1.9mm.

Feature Summary

• Internal 2.85V power supply ensures signal consistency across all levels.
• Low power consumption reduces energy usage compared to resistor terminators.
• Enable pin facilitates flexible SCSI network construction by disconnecting lines.
• Integrated thermal shutdown circuit protects against overheating.

Applications

• Compact disk drives
• Optical disk drives and CD-ROM drives
• Tape drives
• Personal computers including laptop and notebook models
• Workstations and mainframes

Procurement Notes

Verify the specific suffix 'YE2' against official ROHM documentation to confirm packaging and environmental compliance details. Ensure the design utilizes the correct enable logic, as the BH9595 requires a LOW signal to activate termination. Confirm thermal management requirements given the power dissipation characteristics on standard glass epoxy boards.

Selection Notes

Select this component for applications requiring low-power SCSI termination where space is limited. Compare with the BH9596 variant if high-level enable logic is preferred over the low-level enable required here. Ensure the system power supply remains within the 4.0V to 5.5V range to maintain proper VM voltage generation and operational stability.

Part Context

This part belongs to the BH9595/BH9596 series of multimedia ICs designed specifically for SCSI interface termination. It serves as a direct replacement for traditional passive resistor networks, offering significant size reduction and power savings. The series supports both SCSI-I and SCSI-II standards, making it suitable for legacy and contemporary storage systems.

Replacement Considerations

BH9596FP-YE2 is a functional alternative within the same series, differing primarily in the enable pin logic polarity. Verify pin compatibility and control signal inversion before substitution.