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DS2109 Datasheet

  • DS2109

  • Plug and Play SCSI Terminator

  • 10頁

  • DALLAS   DALLAS

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DS2109
DS2109
Plug and Play SCSI Terminator
FEATURES
PIN ASSIGNMENT
PDI
R1
R2
R3
R4
R5
HS鈥揋ND
HS鈥揋ND
PDO
R6
R7
R8
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鈥揋ND
PDE
R13
R12
R11
R10
V
REF
鈥?/div>
Fully
SCSI
compliant with SCSI鈥?, Fast SCSI and Ultra
鈥?/div>
Compatible with Plug and Play SCSI Profile
鈥?/div>
Functionally compatible with DS21S07A
鈥?/div>
Provides active termination for 18 signal lines
鈥?/div>
2%
tolerance on termination resistors and voltage
regulator
鈥?/div>
Bus termination sensing
鈥?/div>
Low power down capacitance of 3 pF
鈥?/div>
Onboard thermal shutdown circuitry
DS2109, DS2109S 28鈥揚IN SOIC (300 MIL)
DESCRIPTION
The DS2109 is intended for one chip Plug and Play
(PnP) SCSI termination. Plug and Play SCSI requires
the exit鈥損oint terminator on computer motherboards or
host bus adapters to automatically switch off if an exter-
nal device is connected to the system. The DS2109 sat-
isfies this requirement by offering the engineer a choice
of onboard current sensing circuitry or onboard ground
detect circuitry. If an external device is connected, the
DS2109 will automatically be isolated from the SCSI
bus thereby maintaining proper system termination.
The DS2109 integrates a low drop鈥搊ut regulator, 18
precise switched 110 ohm termination resistors, and
bus termination sensors into a 28鈥損in 300 mil SOIC
package. Active termination provides: greater immu-
nity to voltage drops on the TERMPWR (TERMination
PoWeR) line, enhanced high鈥搇evel noise immunity,
intrinsic TERMPWR decoupling, and very low quies-
cent current consumption. The DS2109 contains an
output port that can control the power down pin of addi-
tional terminators (DS21S07A) for Wide SCSI applica-
tions.
022698 1/10

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