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DS21S07A Datasheet

  • DS21S07A

  • SCSI Terminator

  • 7頁(yè)

  • ETC

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DS21S07A
DS21S07A
SCSI Terminator
FEATURES
PIN ASSIGNMENT
TERMPWR1
R1
R2
R3
R4
R5
VREF1
GND
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
PD
VREF2
NC
R9
R8
R7
R6
TERMPWR2
鈥?/div>
Fully
SCSI
compliant with SCSI鈥?, Fast SCSI and Ultra
鈥?/div>
Backward compatible to the DS2107 and DS2107A
鈥?/div>
Provides active termination for nine signal lines
鈥?/div>
Laser鈥搕rimmed 110
2% tolerance
ohm termination resistors have
鈥?/div>
Low dropout voltage regulator
鈥?/div>
Power鈥揹own
from the bus
mode isolates termination resistors
DS21S07AS 16鈥揚(yáng)IN SOIC (300 MIL)
TERMPWR1
HS鈥揋ND
R1
R2
R3
R4
R5
HS鈥揋ND
VREF1
GND
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
PD
VREF2
HS鈥揋ND
NC
R9
R8
R7
R6
HS鈥揋ND
TERMPWR2
鈥?/div>
SCSI bus hot plug鈥揷ompatible
鈥?/div>
Fully supports actively negated SCSI signals
鈥?/div>
Onboard thermal shutdown circuitry
鈥?/div>
16鈥損in plastic SOIC (DS21S07AS) and 20鈥損in plastic
TSSOP (Thin Shrink Small Outline Package)
(DS21S07AE)
DS21S07AE 20鈥揚(yáng)IN TSSOP (173 MIL)
ACTUAL FOOTPRINT SIZE
.41鈥?/div>
.26鈥?/div>
.41鈥?/div>
.27鈥?/div>
DS21S07AS
DS21S07AE
DESCRIPTION
Fast SCSI and Ultra SCSI require the use of active ter-
minations at both ends of every cable segment in a
SCSI system with single鈥揺nded drivers and receivers.
The DS21S07A SCSI Terminator, which is fully com-
pliant with these standards, enables the designer to
gain the benefits of active termination: greater immunity
to voltage drops on the TERMPWR (TERMination
PoWeR) line, enhanced high-level noise immunity, in-
trinsic TERMPWR decoupling, and very low quiescent
current consumption. The DS21S07A integrates a reg-
ulator and nine precise switched 110 ohm termination
resistors into a monolithic IC. The DS21S07A can be
electrically isolated from the SCSI bus without physical
removal from the SCSI device.
022798 1/7

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