1
Mulimedia ICs
SCSI active terminator
BH9595FP-Y / BH9596FP-Y
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.
Applications
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
Features
1) Internal 2.85V power supply and push-pull opera-
tion, for good consistency at all signal levels.
2) Enable pin for terminator enabling and disconnect-
ing, facilitating SCSI network construction.
3) Low power consumption, ideal for energy-saving
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.
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.
3
Mulimedia ICs
BH9595FP-Y / BH9596FP-Y
Pin descriptions
Pin name
Pin name
14
V
DD1
15
16
17
18
19
--
GND
20
22
23
24
VM
25
21
1
(N.C.) Not to be used
2
3
4
5
6
--
GND
7
GND
8
9
10
11
12
13
V
DD1
Pin No.
Pin No.
SCSI Line 15
SCSI Line 16
SCSI Line 17
SCSI Line 18
SCSI Line 1
SCSI Line 2
SCSI Line 3
SCSI Line 4
SCSI Line 5
SCSI Line 6
SCSI Line 7
SCSI Line 8
SCSI Line 9
SCSI Line 10
SCSI Line 11
SCSI Line 12
SCSI Line 13
SCSI Line 14
TSD (TSD signal output)
EN (Output enable)
Electrical characteristics
DC characteristics (unless otherwise noted, Ta = 25C)
Input leakage current
SCSI equivalent resistance
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
Pin capacity
3
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 = V
DD
1
5 BH9696FP-Y: EN = V
DD
1
, BH9696FP-Y: EN = GND
Parameter
Symbol
Min.
Typ.
Max.
Unit
Conditions
I
IL
50
110
200
A
I
IH
1
--
1
A
I
SLZ
1
--
1
A
I
SLD
15
25
30
mA
I
SLS
7
20
30
mA
V
M
2.700
2.85
3.000
V
4.0 V
DD1
5.5V
I
DDSTB
--
1.0
2.0
mA
I
SLS
300
--
550
mA
I
SLD
300
--
550
mA
R
SL
105
--
115
PC
--
5.0
6.0
pF
Vi = GND, V
DD1
= 5.5V
Vi = V
DD1
, V
DD1
= 5.5V
EN = ENABLE
4
, V
DD1
= 5.5V
EN = ENABLE
4
, 4.0V V
DD1
5.5V
EN = ENABLE
4
4.0 V
DD1
5.5V
4.0 V
DD1
5.5V
4.0 V
DD1
5.5V
4.0 V
DD1
5.5V
EN = DISABLE
5
, 18 SCSI Line = GND
EN = DISABLE
5
, SCSI Line = GND,
EN = DISABLE
5
, 18 SCSI Line = V
DD1
EN = DISABLE
5
, SCSI Line: V
DD1
= 4.7V
EN = DISABLE
5
, SCSI Line = V
DD1
4
Mulimedia ICs
BH9595FP-Y / BH9596FP-Y
Transient characteristics (unless otherwise noted, Ta = 25C)
Parameter
Symbol
Min.
Max.
Unit
Conditions
Load Transient Voltage
2.85V
GND
100
100
mV
Load Transient 1 / 10 decay Time
2.85V
GND
TD1
--
100
s
Load Transient Voltage
GND
2.85V
100
100
mV
Load Transient 1 / 10 decay Time
GND
2.85V
TD2
--
100
s
Load Transient Voltage
2.85V
V
DD1
100
100
mV
Load Transient Voltage
2.85V
V
DD1
TS1
--
100
s
Load Transient Voltage
V
DD1
2.85V
100
100
mV
Load Transient Voltage
V
DD1
2.85V
TS2
--
100
s
EN = DISABLE
, 4.0 V
DD1
5.5V
EN = DISABLE
, 4.0 V
DD1
5.5V
EN = DISABLE
, 4.0 V
DD1
5.5V
EN = DISABLE
, 4.0 V
DD1
5.5V
EN = DISABLE
, 4.0 V
DD1
5.5V
EN = DISABLE
, 4.0 V
DD1
5.5V
EN = DISABLE
, 4.0 V
DD1
5.5V
EN = DISABLE
, 4.0 V
DD1
5.5V
All SCSI Lines: 2.85V
GND Level
All SCSI Lines: 2.85V
GND Level
All SCSI Lines: GND
2.85V Level
All SCSI Lines: GND
2.85V Level
All SCSI Lines: V
DD1
2.85V Level
All SCSI Lines: V
DD1
2.85V Level
All SCSI Lines: 2.85V
V
DD1
Level
All SCSI Lines: 2.85V
V
DD1
Level
VM
TD1
VM
TD2
VM
TS1
VM
TS2
BH9595FP-Y: EN = V
DD1
, BH9596FP-Y: GND
The transient characteristics are guaranteed design values.
5.5V
2.85V
0 V
t
= 50ns
TD1
TD2
TS1
TS1
SCSI
Line
Potential
V
DD1
Level
2.85V
GND Level
VM
VM
TD1
VM
TS1
VM
TD2
VM
TS2
SCSI
Active
Terminator
+
SCSI Line
#1
#18
Same Voltage
as V
DD1
VM
V
DD1
+
Fig. 1 Measurement of transient characteristics
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