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SCSI active terminator
BH9595FP-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.
!
!!
!Application
PC and peripheral appliances, OA appliances, Disk drive appliances
!
!!
!Features
1) Internal 2.85V power supply and push-pull operation, 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)
SCISI active Terminators : 90mW
Conventional resistor terminators : 990mW
Power consumption (25% duty)
SCISI active Terminators : 614mW
Conventional resistor terminators : 15/190mW
Significant reductions in power consumption are possible by using this terminator.
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 : 13.6×5.4×1.9mm
6) Active termination of 18-line SCSI.
7) Internal thermal shutdown circuit.
8) Compatibility with SCSI-I and SCSI-II.
!
!!
!Absolute maximum ratings (Ta = 25°C)
Parameter Symbol Limits Unit
Operating temperature
Operating temperature
Topr
Tstg
1.45
°C
°C
∗1 Drain current (from module to SCSI line) / line
∗2 Sick current (from SCSI line to module) / line
∗3 When mounted to a 90mm×50mm×1.6mm galass epoxy board
0~+75
−55~+125
Power dissipation
∗3
Pd
Power supply voltage
DC output current
∗1
DC output current
∗2
Input voltage
V
DD1
I
SLD
I
SLS
Vi
−0.3~+7.0
−30
35
−0.3~(V
DD1
+0.3)
V
mA
mA
V
W
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!
!!
!Recommended operating conditions (Ta = 25°C)
Parameter Symbol UnitMax.Typ.Min.
SCSI Line voltage
∗ Transient 6V
V
SLX
−0.3 −V
DD1
+0.3 V
Power supply voltage V
DD1
4.0 4.5 5.5
∗
V
Inout voltage (High) V
IH
V
DD1
−0.6 −V
DD1
+0.6 V
Inout voltage (Low) V
IL
−0.3 −0.8 V
!
!!
!Block diagram
25
24
23
22
21
20
19
18
17
16
15
14
1
2
3
4
5
6
8
9
10
11
12
13
7
MODE
CONTROL
2.85V GENERATER
TSD
TSD
Not to be used
(N.C.)
"H" : ENABLE
"L" : DISCONNECT
EN
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
V
DD1
VM
SCSI LINE 14
SCSI LINE 13
SCSI LINE 12
SCSI LINE 11
GND
SCSI LINE 10
SCSI LINE 9
SCSI LINE 8
SCSI LINE 7
SCSI LINE 6
V
DD1
POW to SW
Pullup-R
50kΩ
POW
(PUSH-PULL) (PUSH-PULL)
(PUSH-PULL) (PUSH-PULL)
(PUSH-PULL)
(PUSH-PULL)
110Ω
Resistors
POW
POW POW
POW
POW
POW
POW
2.85V SUPPLY
Shottky barrier diodes
(TRMPWR)
2.2µ0.1µ
SYSTEM POWER
5.0V
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!
!!
!Pin descriptions
Pin No. Pin name Pin description
1
2
3
4
5
6
- -
7
8
9
10
11
12
13
14
15
16
17
18
19
- -
20
21
22
23
24
25
(N.C.) Not to be used
EN
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
V
DD1
V
DD1
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
Enable pin
SCSI Terminator node
SCSI Terminator node
SCSI Terminator node
SCSI Terminator node
GND
GND
SCSI Terminator node
SCSI Terminator node
SCSI Terminator node
SCSI Terminator node
SCSI Terminator node
Terminator power-supply pin (TO/FROM)
Terminator power-supply pin (TO/FROM)
SCSI Terminator node
SCSI Terminator node
SCSI Terminator node
SCSI Terminator node
SCSI Terminator node
GND
SCSI Terminator node
SCSI Terminator node
SCSI Terminator node
SCSI Terminator node
2.85V node
Thermal shutdown output
Pin Assignment Table (HSOP-25)
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!
!!
!Input / output circuits
SCSI
Line
Potential
VDD1 Level
2.85V
GND Level
−5.5V
−2.85V
0V
tτ=50ns
∆VMTD1
τTD1 τTD2 τTS1 τTS1
∆VMTS1
∆VMTD2 ∆VMTS2
VM
SCSI
Active
Terminator
VDD1 SCSI Line
No.1
No.18 Same Voltage
as VDD1
VM
+
−
+
−
Fig.1
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!
!!
!Electrical characteristics (Ta = 25°C)
Parameter Symbol Min. Typ. Max. Unit Conditions
I
IL
I
IH
I
SLZ
I
SLSS
I
SLSD
VM
I
DDSTB
I
SLS
I
SLD
R
SL
PC
∆VM
TD1
τ
TD1
∆VM
TD2
τ
TD2
∆VM
TS1
τ
TS1
∆VM
TS2
τ
TS2
50
−1
−1
15
7
2.700
−
300
300
105
−100
−
−100
−
−100
−
−100
−
110
−
−
25
20
2.85
1.0
−
−
−
5.0
−
−
−
−
−
−
−
−
〈〈 DC characteristics 〉〉
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
〈〈 Transient characteristics 〉〉
Load transient voltage
2.85V → GND
Load transient 1/10 decay time
2.85V → GND
Load transient voltage
GND → 2.85V
Load transient 1/10 decay time
GND → 2.85V
Load transient voltage
2.85V → V
DD1
Load transient 1/10 decay time
2.85V → V
DD1
Load transient voltage
V
DD1
→ 2.85V
Load transient 1/10 decay time
V
DD1
→ 2.85V
200
1
1
30
30
3.000
2.0
550
550
115
6.0
+100
+100
+100
+100
+100
+100
+100
+100
µA
µA
µA
mA
mA
V
mA
mA
mA
Ω
pF
mV
µs
mV
µs
mV
µs
mV
µs
Vi=GND V
DD1
=5.5V
Vi=V
DD1
V
DD1
=5.5V
EN=GND V
DD1
=5.5V
EN=V
DD1
, SCSI Line=GND, 4.0 ≤ V
DD1
≤ 5.5V
EN=V
DD1
, SCSI Line=V
DD1
, 4.0 ≤ V
DD1
≤ 5.5V
4.0 ≤ V
DD1
≤ 5.5V
EN=GND, 4.0 ≤ V
DD1
≤ 5.5V
EN=V
DD1
, 18 SCSI Line=GND, 4.0 ≤ V
DD1
≤ 5.5V
EN=V
DD1
, 18 SCSI Line=V
DD1
, 4.0 ≤ V
DD1
≤ 5.5V
EN=V
DD1
, SCSI Line : V
DD1
=4.7V
EN=GND
EN=V
DD1
4.0 ≤ V
DD1
≤ 5.5V
All SCSI Lines : 2.85V→GND Level
EN=V
DD1
4.0 ≤ V
DD1
≤ 5.5V
All SCSI Lines : 2.85V→GND Level
EN=V
DD1
4.0 ≤ V
DD1
≤ 5.5V
All SCSI Lines : GND→2.85V Level
EN=V
DD1
4.0 ≤ V
DD1
≤ 5.5V
All SCSI Lines : GND→2.85V Level
EN=V
DD1
4.0 ≤ V
DD1
≤ 5.5V
All SCSI Lines : 2.85V→V
DD1
Level
EN=V
DD1
4.0 ≤ V
DD1
≤ 5.5V
All SCSI Lines : 2.85V→V
DD1
Level
EN=V
DD1
4.0 ≤ V
DD1
≤ 5.5V
All SCSI Lines : V
DD1
→2.85V Level
EN=V
DD1
4.0 ≤ V
DD1
≤ 5.5V
All SCSI Lines : V
DD1
→2.85V Level
∗1 Drain Current (from Module to SCSI Line) / Line
∗2 Sink Current (from SCSI Line to Module) / Line
∗3 The transient chracteristics are guaranteed design values.
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!
!!
!Application example
2.2µ2.2µ
VDD1
EN EN
VM VM
GND GND
VDD1
SCSI
Active
Terminator
SCSI
Active
Terminator
No.18 No.18
No.1SCSI DATA LINES
TERMPWR Line
SCSI Line No.1
SCSI Line
System
Power
System
Power
Fig.2
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!
!!
!Operation notes
1. Requirement of mounting design
(1) Thermal reduction curve
0
0.50
1.00
1.50
1.45W
64%
25 50 75 100 125 150
Pd [W]
Ta [°C]
∗ When mounted on a 90×50×1.6 (mm) glass epoxy board.
∗ Reduced by 11.6mW for each increase in Ta OF 1°C over Ta=25°C.
Fig.3
1) Can withstand continuous use 64% duty, at 25°C.
(2) Electrical characteristics
1) Please note to make grand impedance as low as possible because this terminator can operate in even high-
frequency range.
2) Please connect the 2.2µF by-pass capacitor between VDD1 pin (TERMPWR) and GND.
3) Capacitor is not necessary for VM pin.
4) PULL UP-R (50kΩ) is incorporated in EN pin.
Refer to the application circuit.
2. Protection circuit
(1) Thermal shutdown
1) All outputs are opened at 175°C (Typically).
2) Temperature hysteresis is approximately 20°C.
3) Thermal shutdown output table.
!
!!
!External dimensions (Units : mm)
HSOP25
7.8±0.3
5.4±0.2
2.75±0.1
1.95±0.1
25 14
113
0.11
1.9±0.1
0.36
±
0.1
0.3Min.
0.25±0.1
13.6±0.2
0.8 0.1
Appendix
Appendix1-Rev1.0
The products listed in this document are designed to be used with ordinary electronic equipment or devices
(such as audio visual equipment, office-automation equipment, communications devices, electrical
appliances and electronic toys).
Should you intend to use these products with equipment or devices which require an extremely high level of
reliability and the malfunction of with would directly endanger human life (such as medical instruments,
transportation equipment, aerospace machinery, nuclear-reactor controllers, fuel controllers and other
safety devices), please be sure to consult with our sales representative in advance.
Notes
No technical content pages of this document may be reproduced in any form or transmitted by any
means without prior permission of ROHM CO.,LTD.
The contents described herein are subject to change without notice. The specifications for the
product described in this document are for reference only. Upon actual use, therefore, please request
that specifications to be separately delivered.
Application circuit diagrams and circuit constants contained herein are shown as examples of standard
use and operation. Please pay careful attention to the peripheral conditions when designing circuits
and deciding upon circuit constants in the set.
Any data, including, but not limited to application circuit diagrams information, described herein
are intended only as illustrations of such devices and not as the specifications for such devices. ROHM
CO.,LTD. disclaims any warranty that any use of such devices shall be free from infringement of any
third party's intellectual property rights or other proprietary rights, and further, assumes no liability of
whatsoever nature in the event of any such infringement, or arising from or connected with or related
to the use of such devices.
Upon the sale of any such devices, other than for buyer's right to use such devices itself, resell or
otherwise dispose of the same, no express or implied right or license to practice or commercially
exploit any intellectual property rights or other proprietary rights owned or controlled by
ROHM CO., LTD. is granted to any such buyer.
Products listed in this document use silicon as a basic material.
Products listed in this document are no antiradiation design.
About Export Control Order in Japan
Products described herein are the objects of controlled goods in Annex 1 (Item 16) of Export Trade Control
Order in Japan.
In case of export from Japan, please confirm if it applies to "objective" criteria or an "informed" (by MITI clause)
on the basis of "catch all controls for Non-Proliferation of Weapons of Mass Destruction.
