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Mulimedia ICs
SCSI active terminator
BH9595FP-Y / BH9596FP-Y
These SCSI active terminators, developed as a substitute for conventional discrete terminators, maintain good consistency 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 milliwatts 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.
*Applications drives, optical disk drives, CD-ROM driCompact disk
ves, tape drives, personal computers (including laptop computers and notebook computers), workstations, mainframes, laser printers, plotters
*Features 2.85V power supply and push-pull opera1) Internal
tion, for good consistency at all signal levels. 2) Enable pin for terminator enabling and disconnecting, facilitating SCSI network construction. 3) Low power consumption, ideal for energy-saving systems. Power consumption during standby : 90mW (compared to 990mW for conventional resistor terminators)Power consumption at 25% duty : 614mW (compared to 1,360mW for convention resistor terminators)Significant reductions in power consumption are possible.
4) Wide operating range. TERM power : 4.0 ~ 5.5V (Transient : 6.0V) 5) Thin, microminiature design, ideal for space-saving applications. Package body size : 13.6 x 5.4 x 1.9mm 6) Active termination of 18-line SCSI. 7) Internal thermal shutdown circuit. 8) Compatibility with SCSI-I and SCSI-II.
1
Mulimedia ICs
BH9595FP-Y / BH9596FP-Y
*Absolute maximum ratings (Ta = 25C)
Parameter Power supply voltage DC Output current 1 DC Output current 2 Input voltage Power dissipation 3 Operating temperature Storage temperature Symbol VDD1 ISLD ISLS Vi Pd Topr Tstg Limits - 0.3 ~ + 7.0 - 30 35 - 0.6 ~ (VDD1 + 0.6) 1.45 0 ~ + 75 - 55 ~ + 125 Unit V mA mA V W C C
*Recommended operating conditions (Ta = 25C)
Parameter Power supply voltage Input voltage Input voltage SCSI Line voltage Symbol VDD1 VIH VIL VSLX Min. 4.0 VDD1 - 0.6 - 0.3 - 0.3 Typ. 4.5 -- -- -- Max. 5.5 VDD1 + 0.6 0.8 VDD1 + 0.3 Unit V V V V
1 Drain Current (from Module to SCSI Line) / Line 2 Sink Current (from SCSI Line to Module) / Line 3 When mounted to a 90 x 50 x 1.6 mm glass epoxy board
*Block diagram
Not to be used (N.C.) "H": ENABLE "L": DISCONNECT EN 1 2 TSD MODE CONTROL to SW POW POW POW 25 TSD 24 VM 23 SCSI LINE 14 22 SCSI LINE 13 21 SCSI LINE 12 20 SCSI LINE 11 POW (PUSH - PULL) GND POW (PUSH - PULL) GND 110 Resistors 19 SCSI LINE 10 POW (PUSH - PULL) POW (PUSH - PULL) 18 SCSI LINE 17 SCSI LINE (PUSH - PULL) 2.85V SUPPLY POW 2.85V GENERATER POW (PUSH - PULL) BH9595FP-Y 16 SCSI LINE 15 SCSI LINE 14 VDD1 9 8 7 6 SCSI LINE 15 3 SCSI LINE 16 4 SCSI LINE 17 5 SCSI LINE 18 6
Transient
6V
GND 7 SCSI LINE 1 8 SCSI LINE 2 9 SCSI LINE 3 10 SCSI LINE 4 11 SCSI LINE 5 12 VDD1 13
(TRMPWR) Schottky barrier diodes SYSTEM POWER 5.0V 0.1 + 2.2 -
For BH9596 "L": ENABLE
"H": DISCONNECT
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Mulimedia ICs
BH9595FP-Y / BH9596FP-Y
*Pin descriptions
Pin No. 1 2 3 4 5 6 -- 7 8 9 10 11 12 13 Pin name (N.C.) Not to be used EN (Output enable) SCSI Line 15 SCSI Line 16 SCSI Line 17 SCSI Line 18 GND GND SCSI Line 1 SCSI Line 2 SCSI Line 3 SCSI Line 4 SCSI Line 5 VDD1 Pin No. 14 15 16 17 18 19 -- 20 21 22 23 24 25 VDD1 SCSI Line 6 SCSI Line 7 SCSI Line 8 SCSI Line 9 SCSI Line 10 GND SCSI Line 11 SCSI Line 12 SCSI Line 13 SCSI Line 14 VM TSD (TSD signal output) Pin name
*Electrical characteristics otherwise noted, Ta = 25C) DC characteristics (unless
Parameter Input leakage current SCSI line leakage current SCSI line short current 1 SCSI line short current 2 VM voltage Standby current 1 SCSI total sink current SCSI total drain current SCSI equivalent resistance Pin capacity 3 Symbol IIL IIH ISLZ ISLD ISLS VM IDDSTB ISLS ISLD RSL PC Min. 50 -1 -1 15 7 2.700 -- 300 300 105 -- Typ. 110 -- -- 25 20 2.85 1.0 -- -- -- 5.0 Max. 200 1 1 30 30 3.000 2.0 550 550 115 6.0 Unit A A A mA mA V mA mA mA pF Conditions Vi = GND, VDD1 = 5.5V Vi = VDD1, VDD1 = 5.5V EN = ENABLE4, VDD1 = 5.5V EN = DISABLE5, SCSI Line = GND, 4.0 VDD1 5.5V EN = DISABLE5, SCSI Line = VDD1 4.0 VDD1 5.5V 4.0 VDD1 5.5V VDD1 5.5V EN = ENABLE4, 4.0V
EN = DISABLE5, 18 SCSI Line = GND 4.0 VDD1 5.5V EN = DISABLE5, 18 SCSI Line = VDD1 4.0 VDD1 5.5V EN = DISABLE5, SCSI Line: VDD1 = 4.7V EN = ENABLE4
1 Drain Current (from Module to SCSI Line) / Line 2 Sink Current (from SCSI Line to Module) / Line 3 Guaranteed performance 4 BH9595FP-Y: EN = GND, BH9595FP-Y: EN = VDD1 5 BH9696FP-Y: EN = VDD1, BH9696FP-Y: EN = GND
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Mulimedia ICs
Transient characteristics (unless otherwise noted, Ta = 25C)
Parameter Load Transient Voltage 2.85VGND Load Transient 1 / 10 decay Time 2.85VGND Load Transient Voltage GND2.85V Load Transient 1 / 10 decay Time GND2.85V Load Transient Voltage 2.85VVDD1 Load Transient Voltage 2.85VVDD1 Load Transient Voltage VDD12.85V Load Transient Voltage VDD12.85V Symbol VMTD1 TD1 VMTD2 TD2 VMTS1 TS1 VMTS2 TS2 Min. - 100 -- - 100 -- - 100 -- - 100 -- Max. 100 100 100 100 100 100 100 100 Unit mV s mV s mV s mV s
BH9595FP-Y / BH9596FP-Y
Conditions EN = DISABLE, 4.0 VDD1 5.5V All SCSI Lines: 2.85VGND Level EN = DISABLE, 4.0 VDD1 5.5V All SCSI Lines: 2.85VGND Level EN = DISABLE, 4.0 VDD1 5.5V All SCSI Lines: GND2.85V Level EN = DISABLE, 4.0 VDD1 5.5V All SCSI Lines: GND2.85V Level EN = DISABLE, 4.0 VDD1 5.5V All SCSI Lines: 2.85VVDD1 Level EN = DISABLE, 4.0 VDD1 5.5V All SCSI Lines: 2.85VVDD1 Level EN = DISABLE, 4.0 VDD1 5.5V All SCSI Lines: VDD12.85V Level EN = DISABLE, 4.0 VDD1 5.5V All SCSI Lines: VDD12.85V Level
BH9595FP-Y: EN = VDD1, BH9596FP-Y: GND
The transient characteristics are guaranteed design values.
SCSI Line Potential
VDD1 Level 2.85V GND Level t = 50ns
- 5.5V - 2.85V 0V
VMTD1
VMTD2
VMTS1
VMTS2
VM
TD1
TD2
TS1
SCSI Line #1
TS1
VDD1
SCSI Active Terminator + #18 - Same Voltage as VDD1 - +
VM
Fig. 1 Measurement of transient characteristics
4
Mulimedia ICs
BH9595FP-Y / BH9596FP-Y
*Application example
System Power TERMPWR Line System Power + 2.2 - VDD1 SCSI Active Terminator VDD1 SCSI Active Terminator SCSI Line SCSI Line #1 #1 SCSI DATA LINES + 2.2 -
EN GND VM
#18
#18 VM
EN GND
Fig. 2
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Mulimedia ICs
BH9595FP-Y / BH9596FP-Y
*Mode selection table
Mode Disable Enable BH9595FP - Y L H BH9596FP - Y H L
*Thermal reduction curve
2.5 POWER DISSIPATION: P (W) 1.50 1.45W Duty64% 1.00
*Thermal shutdown at 175C (typically). (1) All outputs are opened
(2) Temperature hysteresis is approximately 20C. (3) Thermal shutdown output table
Conditions Normal Shutdown Level "Low" "High"
0.50
0
25
50
75
100
125
150
175
AMBIENT TEMPERATURE: Ta (C)
Fig. 3
*Operation notes operational range includes har(1) This terminator's
monic frequencies. Mount to minimize ground impedance. (2) Connect the VDD1 pin (TERMPWR) to a grounded 2.2F bypass capacitor.
1 2 3
When mounted on a 90 x 50 x 1.6 (mm) glass epoxy board. Reduced by 11.6mW for each increase in Ta of 1C over 25C. Can withstand continuous use of 64% duty, at 25C.
*External dimensions (Units: mm)
BH9595FP-Y BH9596FP-Y
13.6 0.2 2.75 0.1 25 7.8 0.3 5.4 0.2 14
1 1.9 0.1
13 1.95 0.1
0.11
0.8
0.36 0.1
0.3Min. 0.15
HSOP25
6
0.25 0.1

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