BH9595 Rohm, BH9595 Datasheet

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BH9595

Manufacturer Part Number
BH9595
Description
SCSI active terminator
Manufacturer
Rohm
Datasheet

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These SCSI active terminators, developed as a substitute for conventional discrete terminators, maintain good con-
sistency between VM level (2.85V) and GND level (0V) and between VM level and VDD level, and have extremely
low power consumption, dropping to a maximum of 90 milliwatts at standby (compared to the maximum of 990 milli-
watts used by conventional resistance terminators). These SCSI active terminators electrically control SCSI lines,
connecting and disengaging the terminating resistor by electrically controlling the enable pin. (The enable pin is
enabled at the HIGH level and switched to the High-Z state by the LOW level in the BH9595 and by the HIGH level in
the BH9596, completely disconnecting the SCSI line from the SCSI terminator.)
These SCSI active terminators allow for the configuration of flexible, energy-saving SCSI networks, and are ideal for
notebook computers, hard disk drives and a wide range of other products with SCSI capabilities.
Compact disk drives, optical disk drives, CD-ROM dri-
ves, tape drives, personal computers (including laptop
computers and notebook computers), workstations,
mainframes, laser printers, plotters
1) Internal 2.85V power supply and push-pull opera-
2) Enable pin for terminator enabling and disconnect-
3) Low power consumption, ideal for energy-saving
Applications
Features
SCSI active terminator
BH9595FP-Y / BH9596FP-Y
Mulimedia ICs
tion, for good consistency at all signal levels.
ing, facilitating SCSI network construction.
systems.
Power consumption during standby : 90mW (com-
pared to 990mW for conventional resistor termina-
tors)Power consumption at 25% duty : 614mW
(compared to 1,360mW for convention resistor ter-
minators)Significant reductions in power consump-
tion are possible.
4) Wide operating range.
5) Thin, microminiature design, ideal for space-saving
6) Active termination of 18-line SCSI.
7) Internal thermal shutdown circuit.
8) Compatibility with SCSI-I and SCSI-II.
TERM power : 4.0 ~ 5.5V (Transient : 6.0V)
applications.
Package body size : 13.6
5.4
1.9mm
1

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BH9595 Summary of contents

Page 1

... HIGH level and switched to the High-Z state by the LOW level in the BH9595 and by the HIGH level in the BH9596, completely disconnecting the SCSI line from the SCSI terminator.) These SCSI active terminators allow for the configuration of flexible, energy-saving SCSI networks, and are ideal for notebook computers, hard disk drives and a wide range of other products with SCSI capabilities ...

Page 2

... POW 9 (PUSH - PULL) (PUSH - PULL (PUSH - PULL) 2.85V SUPPLY 12 POW (PUSH - PULL DD1 2.85V GENERATER BH9595FP-Y (TRMPWR) Schottky barrier diodes + 0.1 2.2 – BH9595FP-Y / BH9596FP-Y Unit Unit TSD POW SCSI LINE 14 23 POW 22 SCSI LINE 13 ...

Page 3

... SCSI total drain current I SLD SCSI equivalent resistance R 3 Pin capacity PC 1 Drain Current (from Module to SCSI Line) / Line 2 Sink Current (from SCSI Line to Module) / Line 3 Guaranteed performance 4 BH9595FP- GND, BH9595FP- BH9696FP- BH9696FP- GND DD 1 Pin No. Min. Typ. Max. 50 110 200 IL – ...

Page 4

... Load Transient Voltage 2.85V V DD1 Load Transient Voltage 2.85V V DD1 Load Transient Voltage V 2.85V DD1 Load Transient Voltage V 2.85V DD1 BH9595FP- BH9596FP-Y: GND DD1 The transient characteristics are guaranteed design values. SCSI V Level DD1 Line 2.85V Potential GND Level VM + – ...

Page 5

... Mulimedia ICs • Application example System Power + 2.2 – V DD1 EN GND TERMPWR Line SCSI Line SCSI Line #1 #1 SCSI DATA LINES SCSI Active Terminator #18 # Fig. 2 BH9595FP-Y / BH9596FP-Y System Power + 2.2 – V DD1 SCSI Active Terminator EN GND 5 ...

Page 6

... Mulimedia ICs • Mode selection table Mode BH9595FP - Y Disable L Enable H • Thermal shutdown (1) All outputs are opened at 175°C (typically). (2) Temperature hysteresis is approximately 20°C. (3) Thermal shutdown output table Conditions Level Normal “Low” Shutdown “High” • Operation notes (1) This terminator's operational range includes har- monic frequencies ...

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