DS2109
DISCONNECT MODES
Table 2
PDI
0
0
1
1
0
0
1
1
PDE
0
1
0
1
0
1
0
1
I
BUS
> 32 mA?
No
No
No
No
Yes
Yes
Yes
Yes
DS2109 ISOLATED
FROM SCSI BUS?
Isolated
Connected
Connected
Connected
Isolated
Isolated
Isolated
Isolated
NOTE: “1” denotes pin left open circuited.
WIDE SCSI CONFIGURATION
Figure 8
TERMINATION POWER LINE
2.2
µF
TERMPWR1
R1
R2
R3
R4
R5
V
REF1
GND
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
PD
V
REF2
NC
R9
R8
R7
R6
TERMPWR2
PDI
R1
R2
R3
R4
R5
HS–GND
HS–GND
PDO
R6
R7
R8
4.7
µF
R9
TPWR
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28
27
26
25
24
23
22
21
20
19
18
17
16
15
GND
R18
R17
R16
R15
R14
TCS
HS–GND
PDE
R13
R12
R11
R10
V
REF
4.7
µF
DS21S07A 16–PIN SOIC (300 MIL)
DS2109S 28–PIN SOIC (300 MIL)
022698 8/10